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Mobaraz, Hiwa. "Modelling and Design of Digital DC-DC Converters." Thesis, Linköpings universitet, Institutionen för systemteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-127713.
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Digital Switched mode power supplies are nowadays popular enough to be the obvious choice in many applications. Among all set-up and control techniques, the current mode DC-DC converter is often considered when performance and stability are of interest. This has also motivated all the “on chip” and ASIC implementations seen on the market, where current mode control technique is used. However, the development of FPGAs has created an important alternative to ASICs and DSPs. The flexibility and integration possibility is two important advantages among others. In this thesis report, an FPGA-based current mode buck/boost DC-DC converter is built in a stepwise manner, starting from the mathematical model. The goal is a simulation model which creates a basis for discussion about the advantages and disadvantages of current mode DC-DC converters, implemented in FPGAs.
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Saini, Dalvir K. "True-Average Current-Mode Control of DC-DC Power Converters: Analysis, Design, andCharacterization." Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1531776568809249.
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Guo, Liping Nelms R. M. "Design and implementation of digital controllers for buck and boost converters using linear and non-linear control methods." Auburn, Ala., 2006. http://hdl.handle.net/10415/1323.
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Chotikorn, Nattapong. "Implementations of Fuzzy Adaptive Dynamic Programming Controls on DC to DC Converters." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1505139/.
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DC to DC converters stabilize the voltage obtained from voltage sources such as solar power system, wind energy sources, wave energy sources, rectified voltage from alternators, and so forth. Hence, the need for improving its control algorithm is inevitable. Many algorithms are applied to DC to DC converters. This thesis designs fuzzy adaptive dynamic programming (Fuzzy ADP) algorithm. Also, this thesis implements both adaptive dynamic programming (ADP) and Fuzzy ADP on DC to DC converters to observe the performance of the output voltage trajectories.
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Mèndez, Dìaz Juan Francisco. "Desarrollo de un Sistema de Iluminaciòn Solar para el Ahorro de Energìa Elèctrica en el Alumbrado Publico de Mèxico." Doctoral thesis, Universitat Rovira i Virgili, 2018. http://hdl.handle.net/10803/667293.
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D'acord amb les necessitats actuals per a l'obtenció de l'energia resultat d'una demanda energètica creixent, i on una de les fonts energètiques més utilitzada són els hidrocarburs dels quals danyen al medi ambient, es torna indispensable buscar fonts d'energia més amigables amb el medi ambient, com ho són les energies renovables.
D'acord amb l'anterior, una de les hipòtesis de partida d'aquesta tesi consisteix a millorar les prestacions dels sistemes fotovoltaics utilitzats en lluminàries públiques mitjançant la utilització d'un únic convertidor commutat, i crear un model d'innovació que permeti la vinculació entre l'àrea científica i àrea industrial i en aquest cas buscar la comercialització del convertidor commutat únic.
La generació d'un nou model d'innovació i la generació d'una nova estructura convertidora juntament amb el seu modelatge matemàtic i aplicació permetessin millorar les prestacions d'un sistema fotovoltaic, són les dues temàtiques principals estudiades en aquesta tesi com esmentem en el paràgraf anterior.
Basat en idees prèvies presentades en l'estat de l'art s'aconsegueix realitzar una estructura convertidora punt primordial d'aquesta tesi, anomenada convertidor commutat buck-boost versàtil bidireccional, en què es realitzen dos tipus d'anàlisi aplicant el control en mode de lliscament un per manera diürn i un altre per manera nocturna en els dos casos comptant amb superfícies de commutació complexes, el que va permetre millorar les prestacions d'un sistema fotovoltaic, validades mitjançant mesuraments experimentals, mostrant els avantatges amb què compta aquest convertidor davant d'altres convertidors.
Igual que en l'estructura convertidora la creació d'un nou model d'innovació totalment flexible per energies renovables es va realitzar per mitjà d'estudis previs presentats en l'estat de l'art. Aquest model té la particularitat d'adaptar fàcilment per a la realització de qualsevol altre tipus de model d'innovació pel fet que s'explica a detall pas a pas per a la seva realització.De acuerdo con las necesidades actuales por la obtención de la energía resultado de una demanda energética creciente, y donde una de las fuentes energéticas más utilizada son los hidrocarburos los cuales dañan al medio ambiente, se vuelve indispensable buscar fuentes de energía más amigables con el medio ambiente, como lo son las energías renovables. De acuerdo con lo anterior, una de las hipótesis de partida de esta tesis consiste en mejorar las prestaciones de los sistemas fotovoltaicos utilizados en luminarias públicas mediante la utilización de un único convertidor conmutado, y crear un modelo de innovación que permita la vinculación entre el área científica y área industrial y en este caso buscar la comercialización del convertidor conmutado único. La generación de un nuevo modelo de innovación y la generación de una nueva estructura convertidora junto con su modelado matemático y aplicación permitieran mejorar las prestaciones de un sistema fotovoltaico, son las dos temáticas principales estudiadas en esta tesis como mencionamos en el párrafo anterior. Basado en ideas previas presentadas en el estado del arte se logra realizar una estructura convertidora punto primordial de esta tesis, llamada convertidor conmutado buck-boost versátil bidireccional, en el que se realizan dos tipos de análisis aplicando el control en modo de deslizamiento uno para modo diurno y otro para modo nocturno en ambos casos contando con superficies de conmutación complejas, lo que permitió mejorar las prestaciones de un sistema fotovoltaico, validadas mediante mediciones experimentales, mostrando las ventajas con las que cuenta este convertidor frente a otros convertidores. Al igual que en la estructura convertidora la creación de un nuevo modelo de innovación totalmente flexible para energías renovables se realizó por medio de estudios previos presentados en el estado del arte. Este modelo tiene la particularidad de adaptarse fácilmente para la realización de cualquier otro tipo de modelo de innovación debido a que se explica a detalle paso a paso para su realización.
In accordance with the current needs for obtaining the energy resulting from an increasing energy demand, and where one of the most used energy sources are hydrocarbons which harm the environment, it becomes essential to look for sources of energy more friendly to the environment environment, as are renewable energies. In accordance with the above, one of the starting hypotheses of this thesis is to improve the performance of photovoltaic systems used in public luminaires by using a single switched converter, and create an innovation model that allows the link between the area scientific and industrial area and in this case seek the commercialization of the single switched converter. The generation of a new model of innovation and the generation of a new converter structure together with its mathematical modeling and application allow to improve the performance of a photovoltaic system, are the two main themes studied in this thesis as mentioned in the previous paragraph. Based on previous ideas presented in the state of the art, a converting structure is achieved, a primordial point of this thesis, called bidirectional versatile buck-boost switched converter, in which two types of analysis are carried out by applying the control in sliding mode one for mode diurnal and another for night mode in both cases counting with complex switching surfaces, which allowed to improve the performance of a photovoltaic system, validated by experimental measurements, showing the advantages with which this converter has against other converters. As in the case of the converter structure, the creation of a completely new model of innovation for renewable energies was carried out through previous studies presented in the state of the art. This model has the particularity of being easily adapted for the realization of any other type of innovation model because it is explained in detail step by step for its realization.
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Malou, Amokrane. "A study on an integrated 4-Switch Buck-Boost DC-DC converter with high efficiency for portable applications." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI027.
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L’augmentation des performances des produits portables requièrent une exploitation la plus efficace possible de la batterie afin de permettre à ces produits d’être utilisés le plus longtemps possible avant d’être rechargés. Les circuits en aval ont besoin d’une source de tension stable qui peut varier pour chacun d’entre eux entre 1.0 V et 5.5 V à partir d’une tension d’entrée pouvant varier entre 2.5V et 5V. Un convertisseur DC-DC à 4 interrupteurs de type dévolteur-survolteur apparait comme une solution intéressante permettant des opérations de diminutions et d’augmentations de tension d’une part, et d’autres part le meilleur compromis entre rendement, performances dynamiques et coûts (en termes de place occupée sur le Silicium et sur la carte). ON Semiconductor a développé et produit un prototype en technologie CMOS 0.25 µm (procédé propriétaire) d’un tel convertisseur qui sert d’étude de cas pour la thèse. Le convertisseur opère selon plusieurs modes de fonctionnement (mode dévolteur, mode survolteur et mode dévolteur-survolteur) à cause d’un impératif de fonctionnement en fréquence de commutation fixe. Le mode dévolteur-survolteur est le sujet principal traité dans la thèse. Le mode dévolteur-survolteur, aussi appelé mode de transition, peut être implémenté via plusieurs Séquences de Topologie (SdT) possibles. Trois SdTs sont comparées en termes de rendement parmi lesquelles figure la SdT implémentée par le prototype. Les performances dynamiques du convertisseur dans ses différents mode de fonctionnement sont ensuite étudiées en dérivant les expressions analytiques des fonctions de transfert qui les caractérisent. Les modèles dérivés dans Matlab et Mathcad pour évaluer le rendement et les performances dynamiques du convertisseur sont ensuite utilisés pour développer un outil servant à obtenir un dimensionnement rapide de la boucle de contrôle du convertisseur. À partir de cette étape, la stabilité du convertisseur dans ses différents modes de fonctionnement est analysée en utilisant la théorie de Floquet et un modèle échantillonné-linéarisé du convertisseur permettant l’établissement d’une méthodologie de conception d’un tel convertisseur. Enfin, pour améliorer le rendement en mode de transition pour tous les points de fonctionnement, un algorithme contrôlant la valeur de l’hystérésis du comparateur utilisé dans la boucle de contrôle a été développé en Verilog, simulé dans l’environnement CADENCE et implémenté en FPGA. Cet algorithme peut améliorer le rendement de près de 3% en mode de transition comparé au réglage initial de la valeur d’hystérésisThe increase in the performances of the portable devices calls for an energy conversion from the battery that is the most efficient as possible in order to make the devices last as long as possible. The downstream circuits need a steady voltage supply which can vary for each one of them from 1.0 V to 5.5 V from an input voltage varying between 2.5 V and 5 V. A 4-Switch Buck-Boost (4SBB) DC-DC converter appears to be the solution which can perform step-up and step-down voltage perations and get the best trade-off between fficiency, dynamic performances and costs (in terms of Silicium and Board area). ON Semiconductor has developed and taped out in CMOS 0.25 µm (ON Semiconductor process) a 4SBB converter which serves as the case study of the thesis. The converter operates in multiple modes (namely Buck mode, Boost mode and Buck-Boost mode) due to fixed frequency operations. The Buck-Boost mode is the main topic dealt with in the thesis. The Buck-Boost mode, also called "transition mode", can be implemented using several possible Sequences of Topologies (SoT). Three SoTs are compared in terms of efficiency among which the one implemented in the converter. Then the dynamical performances of the converter are studied for the different modes of operations by deriving the analytical expressions of the relevant transfer functions. The models derived in Matlab and Mathcad to evaluate efficiency and dynamical performances are then used to develop a tool to get a rapid sizing of the converter’s control loop components. From this step, the stability of the converter is analyzed using Floquet’s theory and Sampled-Data modeling enabling the building of a design methodology to design such a converter. Finally, to enhance efficiency in Buck-Boost mode whatever the working conditions, an algorithm controlling the hysteresis value of the control loop’s comparator has been developed in Verilog, simulated in CADENCE and implemented in FPGA. This algorithm can improve efficiency by almost 3% in Buck-Boost mode compared to its default setting
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Gallardo, Angelo Miguel Asuncion. "Design and Construction of 1800W Modular Multiple Input Single Output Non-Isolated DC-DC Converters." DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1739.
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This thesis report details the design and construction of non-isolated DC-DC converters to create a Multiple Input Single Output (MISO) converter for combining multiple renewable energy sources into one single output. This MISO uses the four-switch buck-boost topology to output a single 48V from multiple nominal 24V inputs. The MISO converter implements a modular approach to deliver 1800W output power. Each module in the MISO is rated at 600W and they share the output power equally. Hardware results show that the converter produces 1800W of output power from three sources with 96.4% efficiency. Each module also demonstrates equal sharing feature of the MISO converter.
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Elamalayil, Soman Deepak. "Multilevel Power Converters with Smart Control for Wave Energy Conversion." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-332730.
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The main focus of this thesis is on the power electronic converter system challenges associated with the grid integration of variable-renewable-energy (VRE) sources like wave, marine current, tidal, wind, solar etc. Wave energy conversion with grid integration is used as the key reference, considering its high energy potential to support the future clean energy requirements and due the availability of a test facility at Uppsala University. The emphasis is on the DC-link power conditioning and grid coupling of direct driven wave energy converters (DDWECs). The DDWEC reflects the random nature of its input energy to its output voltage wave shape. Thereby, it demands for intelligent power conversion techniques to facilitate the grid connection. One option is to improve and adapt an already existing, simple and reliable multilevel power converter technology, using smart control strategies. The proposed WECs to grid interconnection system consists of uncontrolled three-phase rectifiers, three-level boost converter(TLBC) or three-level buck-boost converter (TLBBC) and a three-level neutral point clamped (TLNPC) inverter. A new method for pulse delay control for the active balancing of DC-link capacitor voltages by using TLBC/TLBBC is presented. Duty-ratio and pulse delay control methods are combined for obtaining better voltage regulation at the DC-link and for achieving higher controllability range. The classic voltage balancing problem of the NPC inverter input, is solved efficiently using the above technique. A synchronous current compensator is used for the NPC inverter based grid coupling. Various results from both simulation and hardware testing show that the required power conditioning and power flow control can be obtained from the proposed multilevel multistage converter system. The entire control strategies are implemented in Xilinx Virtex 5 FPGA, inside National Instruments’ CompactRIO system using LabVIEW. A contour based dead-time harmonic analysis method for TLNPC and the possibilities of having various interconnection strategies of WEC-rectifier units to complement the power converter efforts for stabilizing the DC-link, are also presented. An advanced future AC2AC direct power converter system based on Modular multilevel converter (MMC) structure developed at Siemens AG is presented briefly to demonstrate the future trends in this area.
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Kovář, Jan. "Metody pro řešení spínaných obvodů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-233575.
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The dissertation deals with simulations of the DC-DC converters in their basic configurations (Buck, Boost, Buck-boost, Cuk, SEPIC). In the first part of the thesis derivation of transfer functions Line-to-Output (LTO) and Control-To-Output (CTO) can be found. These symbolic responses are derived for three types of basic converters (Buck, Boost, Buck-boost) using well-known average model [1]. Derived expressions are very complicated. For reduction of these expressions symbolic approximation method was used, however the generality is lost. The average model was used to for decreasing the computational effort of analysis of DC-DC converters in the time domain. For these simulations VHDL-AMS language was used. The main topic of the thesis is harmonic balance method, which was adapted to DC-DC converters. Because conditions and assumptions for LTO and CTO functions are very different, harmonic balance method was derived into two variants. For obtaining of LTO response, duty cycle of switching signal can be considered as constant in time. Spectrum of this signal is simple as follows from well-known sinc function. For obtaining of CTO response PWM modulation must be used. Compared to sinc function spectrum of PWM modulation is richer (contains more combination frequencies). Many types of PWM modulation is described in [31]. For simulation PWM modulation with uniform sampling in two variants (single and double edge) was used. Non-ideal switching of PWM switch was modeled by PWM pulse with defined slew rate. Last section deals with comparison of all derived functions (LTO, CTO, modulation type, defined slew rate) with well-known averaged model.
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You, Keping Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "A new bidirectional AC-DC converter using matrix converter and Z-source converter topologies." Awarded by:University of New South Wales, 2007. http://handle.unsw.edu.au/1959.4/37450.
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This thesis proposes a new bidirectional three-phase AC-DC power converter using matrix converter and Z-source inverter topologies. Advantages of the AC-DC matrix converter are the inherently controllable power factor, the tight DC voltage regulation, the wide bandwidth with quick response to load variation, the single-stage buck-voltage AC-to-DC power conversion; advantages of the z-source inverter are the increased reliability by allowing the shoot-through between upper and lower power switches of one inverter leg, insensitivity to DC bus voltage due to the extra freedom of controlling DC-link voltage. The proposed Matrix-Z-source converter (MZC) marries up both advantages of AC-DC matrix converter and Z-source inverter. It can achieve voltage-boost DC-AC inversion capable of variable voltage variable frequency (VVVF) AC output; it can achieve voltage-buck AC-DC rectification capable of inherent control over AC current phase angle and DC output regulation with a (VVVF) AC source supply. Both foresaid performance in DC-AC inversion and AC-DC rectification can be implemented in a simple open-loop control manner. Three constraints of VSI, in the bidirectional AC-DC power conversion, are the peak AC voltages are always less than DC-link voltage, closed-loop control has to be employed when DC regulation and/or AC current phase angle control are required, and AC voltage is sensitive to the variation of the DC-link voltage in DC-AC inversion. The voltage-boost inversion and/or voltage-buck rectification of MZC overcomes the first constraint; thus MZC enables the AC machine voltage increased higher than DC-link voltage hence advantages of running AC machine at relatively high voltages are enabled. The direct DC voltage regulation and inherent AC-current-phase-angle control of MZC overcomes the second constraint in an open-loop manner; hence a simplified system design is obtained with sufficient room for the further improvement by closed-loop control schemes. The extra freedom in controlling DC-link voltage of MZC overcomes the third constraint hence a DC source voltage adaptable inverter is obtained. This thesis focuses on the study of the feasibility of the proposed MZC through theoretical analysis and experimental verification. At first, the proposed MZC is conceptually constructed by examining the quadrant operation of AC-DC matrix converter and Z-source inverter. After the examination of the operating principles of both AC-DC matrix converter and Z-source inverter, the configuration of MZC is then proposed. The MZC has two operating modes: DC-AC inversion and AC-DC rectification. Circuit analysis for both operating modes shows that the new topology does not impose critical conflict in circuit design or extra restriction in parameterization. On the contrary, one version of the proposed MZC can make full advantage of Z-source network components in both operating modes, i.e. a pair of Z-source inductor and capacitor can be used as low-pass filter in AC-DC rectification. The modulation strategy, average modeling of system, and features of critical variables for circuit design of the proposed MZC were examined for each operating mode. Simulations of the proposed MZC and its experimental verification have been presented. Analytical models of conduction and switching losses of the power-switch network in different operating mode have shown that the losses in the MZC compare favorably with conventional VSI for a range of power factor and modulation indices.
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Barbagallo, Mariano. "HV Interleaved Multiphase DcDc Buck-Boost Converter." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
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in electric vehicle (ev) systems, bi-directional dc-dc converters are used to interface the rechargeable energy storage system (ress) such as the battery bank with the high voltage dc-link of the inverter. currently multi-cell batteries used in automotive systems, such as ev or hev, are subject to a higher failure rate than single cell batteries. the more cells are used in series, the greater the opportunities to fail and the worse the reliability. when a cell has failed the entire string or even worse the battery must be replaced, which is extremely costly [1]. so, to have less cells in series increases the reliability of the system, which also leads to a lower voltage of the dc link. for this reason and many others, in a hybrid or electric vehicle powertrain, a boost dc-dc converter enables optimization of the battery system.
this work aims to investigate all the benefits that come with interleaving technique in dc-dc converters for automotive systems. indeed, these kind of converters for use in high-performance and high-power applications have received increasing interest in recent years. in particular this research work, done with sevcon ltd focuses on the theory behind bi-directional multiphase interleaved (imc) converter and how it could be used to interface a rechargeable energy storage system (ress) to the powertrain of a hybrid or electric vehicle.
more specifically, it was investigated if it is possible to use (after appropriate hardware and software amendments) a standard three phase ac motor inverter as a multiphase interleaved converter. for this purpose two motor controller, produced by sevcon have been analysed. both the gen4 size 10 and the hvlp inverters were considered for use as a dc-dc converter. the voltage can step up or down based on the power flow direction. each phase is indeed a bi-directional buck or boost converter, which is composed of a bridge of power switches and inductor.
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Forster, Andrew E. "Energy Harvesting From Exercise Machines: Buck-Boost Converter Design." DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1702.
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This report details the design and implementation of a switching DC-DC converter for use in the Energy Harvesting From Exercise Machines (EHFEM) project. It uses a four-switch, buck-boost topology to regulate the wide, 5-60 V output of an elliptical machine to 36 V, suitable as input for a microinverter to reclaim the energy for the electrical grid. Successful implementation reduces heat emissions from electrical energy originally wasted as heat, and facilitates a financial and environmental benefit from reduced net energy consumption.
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Querol, Borràs Jorge. "MCU Controlled DC-DC Buck/Boost Converter for Supercapacitors." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-101205.
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This work is focused on DC to DC conversion, what is a crucial function to enable the use of supercapacitors for energy storage. A theoretical study and comparison of methods, algorithms and techniques for software controlled DC-DC converters have been used to develop a system what can step up or down a DC variable voltage and transform it into a steady state voltage. As a result a new control theory based on Bang-Bang control has been developed with an ARM LPC1768 processor. It was implemented to solve the commercial converters problems because they cannot work with supercapacitors due to their low internal resistance. The outcome is a device what can provide a programmable voltage between 4.5 V and 25 V, hardware can support up to 6 A and it is able to control the operating current owing through the converter. It can be used with the supercapacitors as shown in this work but it can also be used as a general platform for voltage and energy conversion. Furthermore, the designed hardware has the potential to work with smart grids via Ethernet connector, solar panels with MPPT algorithms and, at last, manage energy between dierent kinds of DC voltage sources and devices.Detta arbete är inriktat på DC till DC konvertering, vad är en viktig funktion för att möjliggöra användningen av superkondensatorer för lagring av energi. En teoretisk studie och jämförelse av metoder, algoritmer och tekniker för program styrs DC-DC omvandlare har använts för att utveckla ett system vad som kan stega upp eller ner en DC variabel spänning och omvandla det till ett stabilt tillstånd spänning. Som ett resultat av en ny kontroll teori bygger på Bang-Bang kontroll har utvecklats med en ARM LPC1768 processor. Det genomfördes för att lösa de kommersiella omformare problemen eftersom de inte kan arbeta med superkondensatorer på grund av deras låga inre motstånd. Resultatet är en anordning vilken kan tillhandahålla en programmerbar spänning mellan 4,5 V och 25 V, kan hårdvaran att stödja upp till 6 A och det är möjligt att styra operativsystemet ström som flyter genom omvandlaren. Den kan användas med de superkondensatorer, såsom visas i detta arbete, men den kan också användas som en allmän plattform för spänning och energiomvandling. Dessutom har hårdvara möjlighet att arbeta med smarta nät via ethernet-uttag, solpaneler med MPPT algoritmer och äntligen, hantera energi mellan olika typer av DC spänningskällor och enheter.
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Whitaker, Michael Peter. "Improving the control strategy for a four-switch buck-boost converter." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/42125.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.Includes bibliographical references (p. 125-126).
The four-switch buck-boost converter, such as implemented with the Linear Technology LTC3440 integrated circuit, is useful in many applications. While this topology can be highly efficient, new strategies for controlling it could decrease power losses even more. The strategy proposed for this thesis involves the use of level shifted triangle waves and high speed comparators to achieve a narrower buck-boost region than achieved in previous control IC's such as the LTC3440. Reducing the amount of operation in this regime is desirable because it is the most inefficient mode of operation of the converter. This potentially simpler solution will allow for resources to be used to improve the performance of other elements of the circuit, allowing for potential increases in efficiency.
by Michael Peter Whitaker.
M.Eng.
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Bezerra, Gabriel Ribeiro. "Modeling and control of The DC-DC Buck-Boost converter using parametric identification techniques." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=14745.
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CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel SuperiorThis work presents procedures for modeling a Buck-Boost converter based on offline parametric identification techniques, with employment of black box and gray box models. For the identification of the control-to-output-voltage transfer function, the nonlinear Hammerstein model is employed, a particularly interesting structure to identify DC-DC converters for its ability to incorporate nonlinear static characteristic aside from the dynamic behavior of the plant. The identification of the mentioned transfer function is achieved from input and output data, obtained in simulations. In order to identify transfer function parameters, a restricted least squares algorithm is used. As for the identification of the control-to-inductor-current transfer function, a linear black box first order model is considered, with its parameters being determined from systemâs frequency response. In order to show the modelâs utility, a control system is designed based on the identified expressions. The control system employed is the digital version of type 3 compensator for the voltage loop and type 2 compensator for the current loop, both operating under or logics. The identification results of the system presented excellent agreement between the obtained parametric models and the converterâs behavior, showing the reliability of the identification techniques employed in this work. Furthermore, the control system designed from the identified transfer functions presented good performance, providing stability and quick disturbance rejection, bolstering the validity of parametric identification methods applied to the Buck-Boost converter.
Este trabalho apresenta procedimentos para a modelagem de um conversor Buck-Boost com base em tÃcnicas de identificaÃÃo paramÃtricas offline com emprego de modelos matemÃticos tipo caixa preta e caixa cinza. Para a identificaÃÃo da funÃÃo de transferÃncia que relaciona a tensÃo de saÃda e a razÃo cÃclica, à empregado o modelo nÃo linear de Hammerstein, estrutura particularmente interessante para aplicaÃÃo em identificaÃÃo de conversores CC-CC por incorporar a caracterÃstica estÃtica nÃo linear da planta de forma dissociada ao seu comportamento dinÃmico. A identificaÃÃo da funÃÃo de transferÃncia citada à feita a partir de dados de entrada e saÃda do sistema, medidos em simulaÃÃo. Para determinaÃÃo dos parÃmetros da funÃÃo de transferÃncia que relaciona a tensÃo de saÃda e a razÃo cÃclica, à utilizado um algoritmo de mÃnimos quadrados nÃo recursivo com restriÃÃes. Quanto à identificaÃÃo da funÃÃo de transferÃncia que relaciona a corrente no indutor e a razÃo cÃclica, à empregado um modelo caixa preta linear de primeira ordem, sendo os parÃmetros de tal modelo determinados a partir da resposta em frequÃncia do sistema. Visando mostrar a utilidade dos modelos paramÃtricos, à realizado um projeto de controle com base nas expressÃes identificadas. O sistema de controle adotado à a versÃo digital de um compensador tipo 3 para a malha de tensÃo e de um compensador tipo 2 para a malha de corrente, que operam de forma alternada segundo a lÃgica ou. Os resultados de identificaÃÃo do sistema apresentam uma excelente concordÃncia entre os modelos paramÃtricos obtidos e o comportamento do conversor, mostrando a confiabilidade das tÃcnicas de identificaÃÃo empregadas nesse trabalho. Adicionalmente, o sistema de controle projetado a partir das funÃÃes de transferÃncia estimadas apresentou bom desempenho, garantindo estabilidade e rÃpida rejeiÃÃo a distÃrbios, reforÃando a validade dos mÃtodos de identificaÃÃo paramÃtrica aplicados ao conversor Buck-Boost.
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González, Castaño Catalina. "Analysis and implementation of a bidirectional dc-dc converter with coupled inductor for an electric vehicle powertrain." Doctoral thesis, Universitat Rovira i Virgili, 2019. http://hdl.handle.net/10803/667655.
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En aquesta tesi es proposa l'ús d'un convertidor Buck-Boost no inversor situat entre les bateries i l'inversor per regular el bus de contínua del sistema de tracció d'un vehicle elèctric (VE). El convertidor es basa en el Buck-Boost versàtil que ha demostrat un comportament excel·lent en aplicacions de baixa potència i commutació dura en diferents sistemes basats en piles d'hidrogen. A partir d'aquí, ampliar l'ús del convertidor per aplicacions de més alta tensió com les del VE és un repte que s'aborda en aquest treball. L'ús d'un convertidor reductor/elevador d'alta eficiència en el sistema de tracció d'un VE, com és el cas del convertidor versàtil, pot millorar l'eficiència del conjunt per a un rang més ampli de velocitat del motor elèctric que inclou cicles de conducció urbans i en autovia mentre permet la funció tant en tracció com en regeneració (fre regeneratiu). El sistema de control del convertidor consisteix en un llaç extern de tensió i un llaç intern de corrent programats amb el controlador digital de senyal (DSC) TMS320F28377S. Les anàlisis teòriques han estat validades a través de simulacions i proves experimentals realitzades en un prototip construït per a treballar a 400 V i 1,6 kW.En esta tesis se propone el diseño de un convertidor bidireccional no inversor buck-boost localizado entre la batería y el inversor para regular la tensión dc del sistema de tracción de un vehículo eléctrico (VE). La topología del convertidor está basada en el convertidor versátil buck-boost, el cual para aplicaciones en baja tensión y conmutación dura ha mostrado un gran desempeño, principalmente en distintas topologías de sistemas con pilas de combustible. Por lo tanto, este trabajo se direcciona en el uso de este convertidor para aplicaciones de alta tensión, tal como el vehículo eléctrico. El uso de un convertidor elevador / reductor con alta eficiencia, como en el caso del convertidor versátil, en el sistema de tracción de un VE puede mejorar la eficiencia de todo el sistema para una amplia gama de velocidades del motor eléctrico que comprende las zonas urbanas permitiendo la operación en condiciones de motorización y regeneración (frenos regenerativos). El control propuesto para el convertidor corresponde a un controlador en cascada de retroalimentación con un lazo externo de tensión y un control digital de corriente interno que utiliza el controlador de señal digital (DSC) TMS320F28377S. Los análisis teóricos se han validado mediante simulaciones y pruebas experimentales realizadas en un prototipo construido de 400 V y 1.6 kW.
In this thesis a bidirectional noninverting buck-boost converter located between a battery pack and the inverter to regulate the dc bus in electric vehicle (EV) powertrain is proposed. The converter is based on the versatile buck-boost converter, which in low voltage and hard-switching applications has shown a great performance in different topologies of fuel cell systems. Therefore, extending the use of the converter to higher voltage applications such as the EV is a challenge that is addressed in this work. The use of a high-efficiency step-up/step-down converter, as in the case of the versatile converter, in an EV powertrain can improve the whole system efficiency for an extent range of electric motor speeds which comprises urban and highway driving cycles while allowing the operation under motoring and regeneration (regenerative brake) conditions. The proposed converter control corresponds to an outer voltage feedback loop and an inner current programmed controller using the digital signal controller (DSC) TMS320F28377S. The theoretical analyses have been validated by means of simulations and experimental tests performed on a 400-V 1.6-kW purpose built-prototype.
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Lee, Julie JoAnn. "Steady-State and Small-Signal Modeling of a PWM DC-DC Switched-Inductor Buck-Boost Converter in CCM." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1340804411.
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Hernandez, Lucas. "Etude et réalisation d’un convertisseur AC/DC Buck Boost réversible à haut rendement pour alimentation de secours." Phd thesis, Toulouse, INPT, 2017. http://oatao.univ-toulouse.fr/20732/1/HERNANDEZ_Lucas.pdf.
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Les Alimentations Sans Interruption (ASI) ont pour rôle de protéger les charges sensibles. Leur utilisation nécessite l’usage de convertisseur de puissance AC/DC triphasé abaisseur et/ou élévateur de tension. Les ASI utilisent généralement une chaîne de conversion DC/DC+DC/AC ayant un rendement aux alentours de et sont souvent employées de façon continue. L’objectif de cette thèse est donc d’étudier un convertisseur DC/AC triphasé réversible en puissance susceptible de fonctionner en abaisseur et en élévateur de tension pour atteindre un rendement souhaité de 98% avec un minimum de 97,5%. L’étude s’oriente vers des architectures de convertisseurs peu conventionnelles, l’utilisation de semi-conducteurs grand gap (SiC) et de composants passifs à faible pertes. Une méthode de comparaison rapide qui est à la fois analytique et numérique est présentée pour dimensionner ces architectures en se basant sur les caractéristiques fournies par les constructeurs. La solution ‘Gradateur Onduleur Différentiel’ a été jugée comme la plus adaptée à nos besoins. Les choix techniques pour ce convertisseur sont détaillés, puis une étude de faisabilité présentée. Le convertisseur retenu est non linéaire et sa commande utilise des principes de fonctionnement atypiques, différentes stratégies de régulation sont donc présentées. Des tests sont effectués pour valider la commande mise en place et réaliser les essais fonctionnels et mesures de rendement. Enfin les résultats sont comparés aux prévisions et la solution proposée est finalement globalement comparée à la chaîne de conversion AC/DC+DC/DC classique.
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Singh, Manmeet. "Switching Power Converter Techniques for Server and Mobile Applications." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu159486698396321.
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Πετρίδης, Κωνσταντίνος. "Ανάλυση και έλεγχος boost και buck boost dc-dc μετατροπέων." Thesis, 2013. http://hdl.handle.net/10889/6419.
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Στην παρούσα διπλωματική εργασία περιγράφεται η εφαρμογή μη γραμμικών μεθόδων ελέγχου στους Boost και Buck Boost DC-DC μετατροπείς που χρησιμοποιούν την τεχνική PWM. Συγκεκριμένα αναφερόμαστε στην μέθοδο ελέγχου βασισμένη σε παθητική σχεδίαση (PBC) καθώς και στην βασισμένη σε παθητική σχεδίαση μέθοδο ορισμού εσωτερικής ζεύξης και απόζευξης (IDA-PBC) και παρουσιάζουμε τα αποτελέσματα των εξομοιώσεων μέσω του προγράμματος Matlab-Simulink. Τέλος παρουσιάζεται ένας νέος μη γραμμικός-δυναμικός ελεγκτής, ικανός να διαμορφώσει την τάση εξόδου ανεξάρτητα από τον τύπο του φορτίου για τον DC-DC boost μετατροπέα.The current diploma thesis discusses the application of nonlinear control methods for Boost and Buck Boost DC-DC converters using Pulse-Width-Modulation technique. Specifically we refer to the Passivity Based Control (PBC) as well as the Interconnection and Damping Assignment-Passivity Based Control (IDA-PBC) and Matlab-Simulink’s simulation results are presented. Finally, a new nonlinear dynamic control scheme suitable for DC-DC boost converter is introduced, capable of regulating the converter output at the desired level independently from the kind of the load.
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O, Enkhtuya, and 歐安塔. "Design of Buck-Boost DC-DC converters." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/f3y52u.
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碩士國立勤益科技大學
電子工程系
105
DC-DC conversion would provide the correct power to the system needed. Many different varieties of voltage regulators with a variety of control schemes are used. DC-DC converters are some of the most widely used power electronics circuits for its conversion efficiency and flexible output voltage. In this thesis 3 common topologies that makes useful are the Buck, Boost, and the Buck Boost converters. These converters used for electronic devices are designed to regulate the output voltage against the changes of the input voltage and load current. The first converter is a buck converter which steps a voltage down. The producing voltages would be lower than the input voltage. The next converter is a boost converter that steps a voltage up producing a voltage higher than the input voltage. A buck boost converter step a voltage up or down, producing a voltage equal to or higher or lower than the input voltage. The performance has been proved by the Multisim software. The performance simulation mainly focuses on analysis of different DC-DC converters. Each converter has its own peak-to-peak inductor ripple current, peak-to-peak capacitor, inductor, on switch of different converters, all of which are expressed mathematically.
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Lin, Wen-yu, and 林文宇. "Analysis and Study of Buck and Boost converters." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/64813997964034876675.
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碩士國立高雄第一科技大學
電機工程研究所碩士在職專班
103
In this research, the characteristics of Buck and Boost converters are analyzed and studied. The problem of direct current converters are formulated for design procedure. Besides, how the components of induce and capacitor influence converters is studied. The influence is revealed by computer simulation for the proposal of direct current converter design.
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Kikuchi, Jun. "Analysis and control of three phase AC-DC PMW boost-buck and buck-boost bidirectional power converters." 2002. http://www.library.wisc.edu/databases/connect/dissertations.html.
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Yang, Lung-sheng, and 楊隆生. "Novel High-Power-Factor Buck/Boost AC/DC converters." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/52516179200725982035.
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博士國立成功大學
電機工程學系碩博士班
96
The novel single-phase and three-phase power-factor-correction (PFC) AC/DC buck-boost converters are proposed in this dissertation. The novel PFC converters are operated in discontinuous conduction mode (DCM) by using a simple pulse-width modulation (PWM) control strategy to achieve good power quality, including almost unity power factor, purely sinusoidal input current and low total harmonic distortion of input current (THDi). For the novel single-phase PFC AC/DC buck-boost converter, this converter can be operated with larger duty-ratio range than the conventional single-phase PFC AC/DC buck-boost converter. Therefore, this converter can be applied for universal input voltage (85 – 265 V) and wide output-power range. Moreover, a single-stage single-phase AC/DC converter, which integrates the novel single-phase AC/DC buck-boost converter with a DC/DC buck converter, is presented. This converter can be used for universal input voltage, low DC output voltage and wide output-power range. Based on practical applications, the intermediate DC-link voltage must be less than 450 V. From the experimental results, one can see that the intermediate DC-link voltage is below 210 V. For the novel three-phase PFC AC/DC buck-boost converter, this converter provides a constant average current to the output capacitor and load in each switching period. So the DC output-voltage ripple is affected by only one switching period. The ripple component of six-order line frequency can be eliminated. Therefore, a smaller output capacitor can be used to replace the bulky capacitor. Also, a single-stage three-phase AC/DC converter, which integrates the novel three-phase PFC AC/DC buck-boost converter with a DC/DC forward converter, is proposed for low DC output-voltage applications. Since the ripple component of the intermediate DC-link voltage is affected by only one switching period, a smaller DC-link capacitor can be used. Based on practical applications, the rear semi-stage is operated in continuous conduction mode (CCM) at heavy loads, and is operated in DCM at light loads. From the experimental results, one can see that the intermediate DC-link voltage can be controlled within 280 V. Finally, the steady-state analysis of voltage gain, boundary operating condition, as well as the selection of inductor, output capacitor and input filter are presented. Also, hardware circuits with simple control logic are implemented to illustrate the theoretical analysis and feasibility.
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Chung, Ling, and 鐘翎. "Implementation of Buck and Boost Converters by Using PWM IC." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/11633758016580070452.
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碩士國立勤益科技大學
電子工程系
102
The feature comparison of two PWM (Pulse Width Modulation) ICs, TL494 and SG3525, is studied in this thesis. Furthermore, by adjusting the duty cycle of the PWM signals generated by these two ICs, the buck and boost converters applied to switching power supplies can be implemented. For obtaining a stable output voltage, the feedback design of voltage regulator in the converter also uses the internal error amplifier within TL494 or SG3525 to perform the error adjustment. According to the experimental results for line regulation and load regulation, finally, the implemented buck and boost converters have proved that they can obtain stable output voltages under the control of TL494 and SG3525, respectively. Especially for SG3525, its performance on line regulation and load regulation is more excellent than that of TL494.
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Hsu, Tsailiang, and 徐在良. "Efficiency comparison of boost and buck-boost DC-DC converters in solar power system." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/17577774342625717257.
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碩士國立屏東科技大學
環境工程與科學系所
104
This paper is the application of solar cells as a power source of the energy storage device.The main principle is that the solar cells are subject to different illumination light by the variable voltage outputthrough the Boost Converter or Buck-boost Converter convert fixed voltage outputand then reaches a voltage value can control module or desired energy storage device.Its facilities include Arduino hardware control, voltage and current detection module, solar cell modules, electronic loader, Boost and Buck-boost circuit. The experimental solar cells are efficient power supply and the proper functioning of the loading, but the efficiency of the two aforementioned DC power converters that obtained less than 50%, Boost converter respectively 45.93% and 47.76% Buck-boost converter. This paper will discuss some of the final results are not expected for such reasons, and to explore possible directions for improvement in the future. Keywords：DC power converters,Boost converter, Buck-boost converter, Arduino.
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Li, Yan-Cun, and 李彥村. "Boost and Buck-Boost Power-Factor-Corrected AC-to-DC Resonant Converters with ZVS Operation." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/ggv4e9.
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碩士國立中山大學
電機工程學系研究所
96
The research presents two novel high power factor ac-to-dc resonant converters with symmetrical topologies and zero-voltage-switching (ZVS) operation. The derived circuits are obtained from the integration of a dual-switch boost-type or buck-boost-type power factor corrector (PFC) into a half-bridge resonant converter. With symmetrical topology, the circuit is simple and the voltage and current stresses on the two active power switches are identical to each other. The PFC is operated at discontinuous conduction mode (DCM) to achieve unity power factor. The resonant energy tank of half-bridge resonant converter is designed to be inductive to retain ZVS operation. The design equations are derived based on fundamental approximation. Prototypes of the two proposed converters designed for 100 W and 50 W, respectively, were built and tested to verify the computer simulations and analytical predictions. Satisfactory results are obtained experimentally.
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Lee, Te-Lun, and 李德崙. "A Study on the Dynamics of DC-DC Buck-Boost Converters." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/96824682581146433543.
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碩士中原大學
電機工程研究所
86
This thesis proposes a new way we offer to study the dynamics of the dc-dc buck-boost converters operating respectively in the continuous-conduction mode (CCM) and the discontinuous-conduction mode (DCM) by deriving the precise solutions and the accurate formulas. In the meantime, the computer simulations and the circuit experiments are given to confirm the theoretical results. The chief results of our work are as follows: (1) Using a very simple way, we can obtain the precise solutions to the dc-dc buck-boost converters operating individually in CCM and DCM. (2) By the precise solutions, we can classify two different cases of the output voltage waveforms respectively in CCM and DCM. (3) The simulations and the experiments of the dc-dc buck-boost converters can be performed to verify the results of the theoretical analyses individually in CCM and DCM. (4) The accurate formulas of the boundary between continuous and discontinuous conduction can be got. And the accurate formulas of the average output voltages and the output voltage ripples can also be gained individually in CCM and DCM. (5) The boundary between continuous and discontinuous conduction, the average output voltages and the output voltage ripples can be discussed when all of the system parameters are varied by means of the derived accurate formulas.
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Kuo, Chao-Shen, and 郭朝生. "T-S Fuzzy Model-based Control for Buck-boost Power Converters." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/4sv9r2.
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碩士中原大學
電機工程研究所
91
Nowadays, T-S fuzzy model is a rapid growing modeling method which originates from Takagi and Sugeno. It is described by fuzzy IF-THEN rules where the consequent parts are local linear models. So it can easily approximate or exactly represent a nonlinear system. Once a fuzzy representation of a nonlinear system is described by if-then rules, the control problem becomes to find a local linear or nonlinear compensator to achieve the desired objective. When considering controller and observer design we use the conception of parallel distributed compensation (PDC) to carry out these designs. The stability analysis and controller synthesis are then systematically formulated into linear matrix inequalities (LMIs). The LMI problem can be solved very efficiently by convex optimization techniques. In this thesis, we apply T-S fuzzy theory to design the controller of PWM buck-boost converter. First, we use state-space averaging method to obtain the dynamic equations of the converters. An integral-type controller is introduced to deal with the output regulation problem. After using coordinate translation, a T-S fuzzy model suitable for designing control gains is formulated. The control gains are obtained by solving a set of LMIs. Finally, we end up with close-loop system simulations. Second, we perform electrical implementation. The experiment results for the developed PWM buck-boost converter show satisfactory performance even that the loading and the input voltage suffer from changing.
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Kuan-TseLin and 林冠澤. "Bridgeless Power Factor Correction with Integration of Forward and Buck-Boost Converters." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/52004139503310227130.
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碩士國立成功大學
電機工程學系
103
This thesis proposes a bridgeless power factor correction with integration of forward and buck-boost converters. The rectifier can be considered equivalent to a single switch that controls two subconverters (buck-boost and forward subconverters) that share and deliver the total output power synchronously. By using a high power factor for the buck-boost subconverter and an appropriate transformer design for the forward subconverter, the total harmonic distortion (THD) of the input current can be effectively reduced. To reduce the volume and core loss of the transformers, the forward subconverter directly delivers a major part of the output power to the load. Since no full-bridge rectifier or coupling capacitor is used in the current flowing path in the power conversion process (similar to the Cúk converter, single-ended primary inductor converter, and Zeta converter), conduction losses are reduced and the efficiency and thermal performance of the proposed rectifier are enhanced. Moreover, because the proposed rectifier is designed to operate in the discontinuous inductor current mode, the current loop is not required. Furthermore, the two switches in the circuit can be controlled using a single control signal, which simplifies the design of the control system considerably. The operating principles, steady-state analysis, and design guidelines of the proposed rectifier are detailed in this thesis. To verify the effectiveness and feasibility of the proposed rectifier, simulations and experiments are conducted using a 135 W prototype circuit with an input voltage in the range of 90–130 Vrms (60 Hz) and an output voltage of 48 Vdc. The experimental results show that the THD of the input current is less than 13.4% under different input voltages and output powers. Moreover, the prototype circuit shows a maximal efficiency of 90.7%.
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Hsueh-KoLiao and 廖學科. "Interleaved Buck/Boost Converters for Fuel Cell and Li-ion Battery Hybrid Energy System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/08224108915289447079.
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博士國立成功大學
電機工程學系
102
Proton exchange membrane (PEM) fuel cells (FCs) are widely used in electrical vehicle systems. Since the PEM FCs can not provide very high levels of instant current to the load, lithium batteries and supercapacitors are usually used in combination with the FCs to provide higher instant power to the load. In addition, the lithium battery and supercapacitor can also supply extra energy to the load when the PEM FCs can not provide enough. In this dissertation, two types of buck/boost DC - DC converters with interleaved control techniques are proposed for the PEM FC, lithium battery, and supercapacitor hybrid energy system. The ripple current on the input and output can be reduced by using interleaved control, compared with the traditional single converter topology. Thus, the overall performance of the interleaved control can be improved with a smaller-sized capacitor. The proposed novel non-inverting buck/boost converter is used to transfer the PEM FC energy to the DC-bus and also provide energy to the load. The common ground issue can be solved by the proposed non-inverting buck/boost converter. In addition, the output power can be increased with the interleaved control technique. The counts of power switches and diodes can also be decreased by the integrated converter. The operating principles and steady-state analysis of the proposed non-inverting buck/boost converter are discussed in detail. Finally, a laboratory prototype is implemented to verify the performance of the proposed converter; the FC output voltage is 24~45 V and the output is 28 V/800 W. Synchronous rectifiers are also adopted to improve the system efficiency. This dissertation also proposes a three-ports interleaved buck/boost DC - DC converter, which transfers energy from the FC to the lithium battery, and from the lithium battery to the DC-bus voltage by using an integrated coupled inductor. A digital signal processor (dsPIC30F4011) is also adopted to control the power flow. When the FC can not provide sufficient energy to the load, the lithium battery energy and supercapacitor will supply extra to the load. When the FC supplies sufficient energy, the digital signal processor (DSP) can also control the proposed three-ports converter to charge the battery appropriately. The operating principles and steady-state analysis of the proposed three ports non-inverting buck/boost converter are discussed in detail. A laboratory prototype is implemented with an FC output voltage of 24~45 V and battery output of 24 V/ 10Ah. The DSP is used to control the proposed two converters to manage the energy among the FC, lithium battery, and load. A laboratory prototype is implemented to verify the effectiveness of the proposed converters.
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Amirabadi, Mahshid. "Soft-Switching High-Frequency AC-Link Universal Power Converters with Galvanic Isolation." Thesis, 2013. http://hdl.handle.net/1969.1/151305.
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In this dissertation the ac-link universal power converters, which are a new class of power converters, are introduced and studied in detail. The inputs and outputs of these converters may be dc, ac, single phase, or multi-phase. Therefore, they can be used in a variety of applications, including photovoltaic power generation, wind power generation, and electric vehicles. In these converters the link current and voltage are both alternating and their frequency can be high, which leads to the elimination of the dc electrolytic capacitors and the bulky low-frequency transformers. Therefore, the ac-link universal power converters are expected to have higher reliability and smaller size. Moreover, these converters are soft switching, which results in negligible switching losses and minimized current and voltage stress over devices.
In the first part of the dissertation, the parallel ac-link universal power converter is studied in detail. This converter is an extension of the buck-boost converter. The series ac-link universal power converter, which is dual of the parallel ac-link universal power converter, is proposed in the second part of this dissertation. This converter is an extension of the Cuk converter. A modified configuration with fewer switches, named sparse ac-link universal power converter is proposed in the third part of this dissertation. The sparse ac-link universal power converters can appear as parallel or series.
The performance of all these configurations is evaluated through simulations and experiments.
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Prakash, Daiva. "Design Of 1400W Telecom Power Supply With Wide Range Input AC Voltage." Thesis, 2007. http://hdl.handle.net/2005/575.
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In the fast growing field of Telecommunications, the back up DC power supply plays a vital role in powering the telecom equipment. This DC power supply is a combination of AC-DC Rectifier coupled with a battery bank to support the load when AC input is not available. Figures 0.1 and 0.2 show the line diagram of the DC power supply. The power supply is the most critical element in a telecom installation and it should be highly reliable in order to have un-interrupted service.
(Fig)
Besides reliability, power density and cost are the driving forces behind the success of a power supply in the market. Off late, the reach of telecom in the society is very wide covering remote villages and major metros. Given this environment, the power supply is exposed to extreme input conditions. It is desirable to design the power supply capable of withstanding wide AC input conditions. Another advantage is that the rectifier unit will keep the battery charged so that the battery will have long life.
This thesis is aimed at designing a 1400W (56V/25A) telecom power supply, keeping in view of the issues expressed above. The aim is to design a Switched Mode Rectifier (SMR) that tolerate wide input voltage variations (90Vac to 300Vac). In addition, the design covers unity input power factor, high efficiency (> 90%), high power density ( ), parallel operation and low cost ( ).
Chapter 1 of this thesis covers the context and motivation of the work. Chapter 2 presents the design issues pertaining to power supplies. The normalized description of the power converters is presented. Such a description enables one to compare several circuit topologies in order to make effective design decisions. In a similar way the effectiveness of the switches and mgnetics are presented to enable design decisions in the output stage of the rectifier. Chapter 3 presents the design of the 1400W telecom power supply, keeping in view of the stated specifications.
The performance results of the converter are presented in Chapter 4. All the design goals have been met. The design exercise has also given insights into possible further improvements. Contributions from this work and course of future development work are indicated in the concluding chapter.
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Khan, Qadeer Ahmad. "Digitally assisted control techniques for high performance switching DC-DC converters." Thesis, 2012. http://hdl.handle.net/1957/30174.
Full textAbstract:
Digitally controlled switching DC-DC converters have recently emerged as an attractive alternative to conventional switching converters based on analog control techniques. This research focuses on eliminating the issues associated with the state of the art switching converters by proposing three novel control techniques: (1) a digitally controlled Buck-Boost converter uses a fully synthesized constant ON/OFF time-based fractional-N controller to regulate the output over a 3.3V-to-5.5V input voltage range and provides seamless transition from buck to buck-boost modes (2) a hysteretic buck converter that employs a highly digital hybrid voltage/current mode control to regulate output voltage and switching frequency independently (3) a 10MHz continuous time PID controller using time based signal processing which alleviates the speed limitations associated with conventional analog and digital.
All the three techniques employ digitally assisted control techniques and require no external compensation thus making the controllers fully integrated and highly cost effective.Graduation date: 2013
Access restricted to the OSU Community at author's request from June 25, 2012 - June 25, 2014
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Song, Cheng Ying, and 宋承穎. "A POSITION SENSORLESS BATTERY/SC POWERED EV PMSM DRIVE WITH BUCK-BOOST INTERFACE CONVERTERS HAVING GRID CONNECTED AND ENERGY HARVESTING FUNCTIONS." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/75820762601083067820.
Full textAbstract:
碩士國立清華大學
電機工程學系
104
This thesis develops an electric vehicle (EV) interior permanent magnet synchronous motor (IPMSM) drive powered by battery/supercapacitor (SC) with grid-connected and energy harvesting functions. Both the battery and the SC are respectively interfaced to the motor drive DC-link via its own bidirectional buck-boost converter. And the interleaved converter is adopted for the battery to possess redundant capability. The DC-link voltage can be varied below or above the battery voltage in wide speed range. The SC can quickly discharge energy to assist the motor rapid acceleration and store the recovered regenerative braking energy and transfer to the battery. Both standard and position sensorless controls for the EV IPMSM drive are conducted and comparatively evaluated. The high-frequency injection (HFI) sensorless control approach with changed injection frequencies is proposed to reduce the inherent back-EMF harmonic effects. Through proper control, good driving performances are preserved, including acceleration/deceleration, reversible and regenerative braking operations. In idle condition, the developed EV motor drive can be arranged to possess grid-to- vehicle (G2V), vehicle-to-grid (V2G) and vehicle-to-home (V2H) operations using the embedded motor drive components. In G2V operation, an on-board switch-mode rectifier (SMR) based charger is formed to perform battery charging with good line drawn power quality. As to the V2H/V2G operations, the 220V/110V 60Hz AC output voltages with good waveform quality are generated from the developed single-phase three-wire (1P3W) inverter to power home appliances. The preset power can also be sent back to the utility grid. As to the established energy harvesting system, the roof mounted PV can directly charge the battery in any conditions. In idle case, the accessible DC source or single-phase AC source can charge the battery via the constructed boost SMR.
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Mao, Yi-Kai, and 毛奕凱. "A Novel Buck-Boost Converter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/49500212731889419464.
Full textAbstract:
碩士崑山科技大學
電機工程研究所
100
Power electronics has been widely used in a variety of high-power products, including power heat control, lighting control, electric machinery control, power converters and HVDC systems, etc., so it’s important how to keep the conversion efficiency of the converter in the process of transformation. This thesis will explain how the hard switching high efficiency DC to DC Novel Buck-Boost Converter to choose the parts, making the converter have good effciency in CCM and DCM situation. The article includes the experimental results of control analysis, constitution of circuit and the input voltage 36V convert to the high voltage output 60V. In addition, the circuit control of A Novel Buck-Boost Converter can be used to the other converters, like buck-boost converter, boost converter and the flyback converter…ect. Also in circuit design, complete the circuit simulate wave with the Ispice, then to complete the measured results with the circuit combination reference data. This Novel Buck - Boost Converter, which not only save the size of the circuit converter, and it can be able to complete a buck-boost mode without LDO. Finally, according to the operating of the converter, the parameters of the calculation with the computer and circuit implementation, confirmed that this circuit can achieve a hard and fast switching characteristics and high conversion efficiency of more than 90%.
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Συρίγος, Στυλιανός. "Μελέτη και κατασκευή εργαστηριακής διάταξης φόρτισης του ηλεκτρικού κινητήρα ενός ηλεκτροκίνητου οχήματος." Thesis, 2012. http://hdl.handle.net/10889/5817.
Full textAbstract:
Η παρούσα διπλωματική εργασία πραγματεύεται το σχεδιασμό και την κατασκευή διάταξης φόρτισης του κινητήρα ενός ηλεκτροκίνητου οχήματος. Η εργασία αυτή εκπονήθηκε στο Εργαστήριο Ηλεκτρομηχανικής Μετατροπής Ενέργειας του Τμήματος Ηλεκτρολόγων Μηχανικών και Τεχνολογίας Υπολογιστών της Πολυτεχνικής Σχολής του Πανεπιστημίου Πατρών. Κύριος σκοπός της διπλωματικής εργασίας είναι η κατασκευή ενός αμφίδρομου ηλεκτρονικού μετατροπέα ισχύος, που θα ελέγχει μια μηχανή συνεχούς ρεύματος ξένης διέγερσης, η οποία συνδέεται μέσω ενός συστήματος μετάδοσης με τον κινητήρα ενός ηλεκτροκίνητου οχήματος. Απώτερος στόχος είναι η εξομοίωση όλων των πιθανών φορτίων που ασκούνται σε έναν κινητήρα κατά την κίνηση του οχήματος. Αρχικά αναλύεται το φορτίου του κινητήρα κατά την κίνηση του οχήματος και αναζητούνται τρόποι για την εξομοίωση και τη σύνδεση των εξωτερικών δυνάμεων που ασκούνται στο όχημα με τη ροπή της μηχανής. Στη συνέχεια αναλύθηκε ο αμφίδρομος ηλεκτρονικός μετατροπέας που χρησιμοποιήθηκε για τον έλεγχο της μηχανής συνεχούς ρεύματος και αναζητήθηκαν οι κατάλληλες μέθοδοι για τον έλεγχο του συγκεκριμένου μετατροπέα. Το επόμενο βήμα ήταν η προσομοίωση του συνολικού συστήματος φόρτισης προκειμένου να εξακρθωθεί η ορθή λειτουργία του πριν την κατασκευή, με χρήση του λογισμικού MATLAB/SIMULINK. Τέλος, μελετάται και κατασκευάζεται στο εργαστήριο η πειραματική διάταξη, με τη χρήση της οποίας διεξάγονται οι μετρήσεις για την επιβεβαίωση και την αξιολόγηση της θεωρητικής μελέτης.This thesis discusses the design and manufacture of a charging device intended for an electric vehicle motor. The work was conducted in the Laboratory of Electromechanical Energy Conversion, Department of Electrical and Computer Engineering, School of Engineering, University of Patras. The main purpose of this thesis is to manufacture a bidirectional electronic power converter able to control a DC motor which is connected with the engine of an electric vehicle via a transmission system. The ultimate goal is to simulate all possible loads exerted on a motor during the vehicle movement. Initially we analyze the load on the engine during vehicle movement and seek ways to simulate and combine the external forces acting on the vehicle with the engine torque. In the sequel the bidirectional electronic power converter used to control the DC motor is analyzed and appropriate control methods are investigated. The next step is to simulate and validate the overall system functionality using MATLAB / SIMULINK, before actually proceeding with the manufacture. Finally, an experimental setup is prepared in our lab, the results of which are utilized to confirm and evaluate the aforementioned theoretical study.
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Wu, Meng-Ru, and 吳孟儒. "Design of Buck Converter and Boost Converter Circuits." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/76356060833285963689.
Full textAbstract:
碩士國立勤益科技大學
電子工程系
102
This paper propose a voltage conversion circuit with feedback control to achieve the buck and boost converters' output stability. In the PWM control circuit, we use TL494 to determine the duty cycle with pulse width modulation(PWM), and design feedback architecture with optical coupler, the feedback signal is supplied to the PWM control circuit, in order to achieve the goal of a stable output. Circuit design proposed in this study, through the experiment of line regulation and load regulation is proved to achieve stable voltage output.
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Yang, Huang-Ping, and 楊煌平. "A Novel Bidirectional Buck-Boost Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/32498712593487382486.
Full textAbstract:
碩士崑山科技大學
電機工程研究所
104
Lead-acid batteries widely used in various applications, such as automotive power system, telecom power supply uninterruptible power system, and so on. However, charge the battery after the electric energy finished is used. The main aim of this thesis is to 120V high-voltage battery and a low voltage 12V supplemental power. Accordingly, a novel bidirectional Buck-Boost converter is proposed in this thesis. In the proposed a novel bidirectional Buck-Boost converter bears the advantages such as simpler circuit structures, lighter weight, smaller volume, as well as lower cost. In addition, can be used to the other converters, like boost converter, buck converter and the flyback converter…ect. The article includes the experimental results of control analysis, constitution of circuit. Also in circuit design, complete the circuit simulate wave with the IsSpice, then to complete the measured results with the circuit combination reference data. Finally, accomplish a novel bidirectional Buck-Boost converter according to the operating of the converter, the parameters of the calculation with the computer and circuit implementation, confirmed that this circuit can achieve a hard and fast switching characteristics and high conversion efficiency of more than 85%.
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Huang, Bi-Lun, and 黃弼侖. "Soft-Switching Bidirectional Buck-Boost Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/70084250569148931050.
Full textAbstract:
碩士崑山科技大學
電機工程研究所
104
The switches of conventional converters are almost hard-switching types, which cause a sudden wave-rise on voltage and current whenever the switch is under the condition of on or off. Also, the switch may be damaged easily when often used, which leads to switch loss, low efficiency, and the rise of switch component stress. In this research, the soft-switching bidirectional buck-boost converter suggests advantages of simple construction, low weight, small volume, and low cost. Additionally, it can be adopted to other converter devices such as buck converters and boost convers. The researchers gave clear explanations toward the circuit on its theory of operational characteristics, and an analysis has been made over the circuit modes. In addition, before designing the circuits, auxiliary soft-ware IsSpice was employed to analyze the simulation waveforms of the converter mentioned above. The referential readings from the simulation waveforms were then applied to complete the actual circuits and test results. After the completion of the soft-switching bidirectional buck-boost converter, its related waveforms were measured and compared with the simulated ones for their accuracy. The result reveals that the efficiency of the circuits can be as high as 94%.
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Liu, An, and 劉安. "Design of Charge-Pump Boost Converter and Flying-Capacitor Buck-Boost Converter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/tyyrj5.
Full textAbstract:
博士國立臺北科技大學
電腦與通訊研究所
102
In this first part of this thesis, a new continuous conduction mode (CCM) low-ripple high-efficiency charge-pump boost converter is presented. Its components include a double voltage charge pump and a low pass LC filter. The voltage boost ratio of the positive low-ripple output voltage of the proposed converter is (1+D) where D is the duty cycle of the control switching signal waveform. Since the energy storage inductor is connected to the power source and the load at all times, the proposed converter always operates in CCM, the transient responses are fast, and the current stress on the output capacitor is reduced and the output voltage ripple is small. In this paper, the operation principles of the CCM low-ripple high-efficiency charge-pump boost converter are described in detail. Its circuitry is designed and implemented with a TSMC 0.35µm CMOS processes whose operation frequency is 1MHz. The circuitry is simple and the power conversion efficiency is up to 90.95%, and the transient response is only 7µs. In this second part of this thesis, a fast transient response flying-capacitor buck-boost converter is proposed to improve the efficiency of conventional switched-capacitor converters. The voltage boost ratio of the proposed converter is 2D, where D is the duty cycle of the switching signal waveform. The behavior of the proposed converter is similar to a conventional synchronous-rectified buck converter, thus the stability of the system is very high. It has positive output voltage, which is different from the negative output voltage of a conventional buck–boost converter. Furthermore, the proposed structure utilizes pseudo-current dynamic acceleration techniques to achieve fast transient response when load changes between heavy load and light load. The switching frequency of the proposed converter is 1 MHz for 3.3V input and 1.0V-4.5V output range application. Experiment results show that the proposed scheme improves the transient response to within 2μs and the total power conversion efficiency can be as high as 89.66%. The proposed converter has been realized by a 2P4M CMOS chip by 0.35μm fabrication process with total chip size of about 1.5 mm × 1.5 mm, PADs included.
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LIU, CHEN-YUEH, and 劉振岳. "Design of Smart Programmable Buck-Boost Converter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/9q6438.
Full textAbstract:
碩士國立雲林科技大學
電子工程系
108
With the change of times, the speed of technological progress is changing rapidly, and the utilization rate of Internet of Things devices is increasing year by year. At present, the wireless sensing nodes installed outdoors usually have both energy collection and storage devices, thereby reducing reliance on the transmission lines to increase the elasticity of the device environment. In order to provide the power supply for such devices and to manage the charge and discharge of the battery at the same time, the multi-input-multi-output (MIMO) power management IC is often used in the system. Therefore, this thesis proposes the use of 0.18-μm CMOS power management IC, combined with advanced RISC Machine (ARM) implementation, in a mixed signal design with the cell-based ARM processor circuit synthesis, and the required analog circuit is completed using full-custom and integrated into the digital circuit on the same chip. The proposed CDL-PWM can save power and area, compared with the previous design, it can save 31.1% of power at D=50% and 65.3% power when D=0%. The imbedded microprocessor circuit also achieves A) program-controlled output to save the cost of redesigning the circuit, B) simultaneously processing sensing information without the need for additional computing units, and C) scanning the operating frequency to achieve maximum conversion efficiency. The smart programmable buck-boost converter is implemented based on TSMC 180 nm Mixed Signal RF General Purpose Process (T18). System simulation can achieve both a stable 1.8V battery voltage and 0.7 to 1.2V programmable voltage at the same time at input range of 0.9 to 3.3V, with a maximum efficiency of 85%.
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Tsao, Jiun-Hau, and 曹浚豪. "HIGH FREQUENCY SYNCHRONOUS BUCK BOOST DC-DC CONVERTER." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/88723223904880136792.
Full textAbstract:
碩士大同大學
電機工程學系(所)
100
In this thesis, we propose a non-inverting topology for buck-boost converter to extend the battery life of a portable device. Four power MOSFETS switches are used to improve the efficiency, and increase the operation frequency to 1MHz to minimize the inductance. The compensated error amplifier is composed of two blocks, unity-gain zero generation block and gain block, realizing phase shift and gain of the feedback loop, respectively. Therefore, it can reduce the capacitor value for circuit integration. The simulation results show that this buck-boost converter can operate in 1MHz with supply voltage from 4.7V to 2.8V, which is suitable for single-cell lithium-ion battery supply applications. The output voltage regulated in 3.3V with a 10uF off-chip capacitor and 3.3uH off-chip inductor. The power efficiency is over 90% for load current from 50mA to 400mA. The quiescent power dissipation is 3mW. The DC-DC converter has been fabricated with a TSMC 0.35um 2p4m 3.3V/5V Mixed Signal CMOS process provided by National Chip Implementation Center(CIC).
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Chiu, Chih-Yi, and 邱至毅. "Analysis of Soft-Switching Bidirectional Buck-Boost Converter." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/93158265739344129527.
Full textAbstract:
碩士國立臺灣海洋大學
電機工程學系
101
Abstract The purpose of this thesis is to analyze the operation of the bidirectional Buck-Boost converter and conversion efficiency, and to explore the process of zero-voltage switching, Buck mode and Boost mode switching element driving voltage and the voltage across the switching waveform. Consider the effects brought about by the resonant capacitor, arising from the use of parasitic elements with resonance technology zero-voltage switching to reduce switching losses, and reduce the adverse effects caused by the parasitic elements and improve the conversion efficiency. When fully loaded, it can improve the stability of the system. Use of IsSpice software simulation of this circuit converters discussed in the case of the CCM and DCM, the waveform of the voltage and current of the converter element of this circuit.
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Lee, Yung-Feng, and 李永豐. "Bidirectional Buck-boost Converter with Automatic Voltage Regulation." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/47956602393686477128.
Full textAbstract:
碩士輔仁大學
電機工程學系碩士在職專班
104
This thesis proposes a bidirectional DC-DC power converter based on microcontroller for charging and discharging of lithium-ion battery set. The converter can automatically reads the input voltage and setup the output voltage command after turning on or reset, parallel connect to power source without setting. After reading the battery voltage, it then determines the required quantities of series connected cells, set up the charging profile, and control the pulse-width-modulation (PWM) duty cycle in order to achieve a stable constant current and constant voltage charging mode as well as discharging voltage output mode. From simulation and experimental results show the feasibility and correctness of the proposed converter and control system.
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Πατσιάς, Ευστάθιος. "Μελέτη και κατασκευή ηλεκτροκινητήριου συστήματος υβριδικού οχήματος : σχεδιασμός και κατασκευή ηλεκτρονικού κυκλώματος ελέγχου της υβριδικής κατάστασης." Thesis, 2009. http://nemertes.lis.upatras.gr/jspui/handle/10889/2598.
Full textAbstract:
Η θεματολογία της εργασίας αυτής περιλαμβάνει την υβριδική τεχνολογία στην αυτοκίνηση. Γίνεται μία εκτεταμένη ανάλυση των υβριδικών οχημάτων, αρχικά κάνοντας αναφορά στην ιστορία των υβριδικών και μη οχημάτων και έπειτα στα περιβαλλοντικά θεμάτα που τα έφεραν στο προσκήνιο. Η ανάλυση περιλαμβάνει επίσης την μελέτη των διαφόρων κατηγοριών υβριδικών οχημάτων, την εξέταση των κατασκευαστικών μερών τους και κλείνει με την παρουσίαση κάποιων χαρακτηριστικών οχημάτων που βγήκαν στην παραγωγή.
Στη συνέχεια, η εργασία περνά στο πειραματικό της στάδιο, που περιλαμβάνει τη μελέτη και κατασκευή ενός ηλεκτροκινητήριου συστήματος για εφαρμογή σε πειραματικό όχημα. Το όχημα μετά τις επεμβάσεις θα είναι υβριδικό, κάνοντας χρήση δύο πηγών ενέργειας, ορυκτά καύσιμα και ηλεκτρισμό. Έγινε η προμήθεια του οχήματος και των απαραίτητων μερών του συστήματος δηλαδή ενός ασύγχρονου ηλεκτροκινητήρα και των μπαταριών, που είναι τύπου οξέος-μολύβδου. Ακολούθησαν μηχανολογικές μετατροπές στο αμάξωμα ώστε να δεχθεί το πρόσθετο σύστημα μετάδοσης κίνησης, οι οποίες και αναλύονται.
Παράλληλα βρίσκονταν σε εξέλιξη οι μετατροπείς ισχύος που απαιτούνται στο σύστημα ηλεκτρικής κίνησης για να προσαρμόσουν τα ηλεκτρικά μεγέθη κατάλληλα ώστε να επιτρέψουν την ροή ισχύος από τις μπαταρίες προς τον κινητήρα, κατά την επιτάχυνση του οχήματος, και την επιστροφή ενέργειας στις μπαταρίες από τη μηχανή, που λειτουργεί ως γεννήτρια λαμβάνοντας ενέργεια από την κινητική του οχήματος.
Οι απαιτούμενοι μετατροπείς είναι ένας αμφικατευθυντήριος μετατροπέας ανύψωσης – υποβιβασμού συνεχούς τάσης σε συνεχή και ένας μετατροπέας συνεχούς τάσης σε τριφασική εναλλασσόμενη, ή πιο απλά τριφασικός αντιστροφέας. Ο δεύτερος μετατροπέας πραγματοποιεί και τον έλεγχο της ροπής που παράγει σε κάθε στιγμή ο κινητήρας μέσω της μεθόδου του Άμεσου Έλεγχου Ροπής (DTC). Περιγράφονται οι μεθοδολογίες ελέγχου των τριφασικών ασύγχρονων κινητήρων και γίνεται λεπτομερής ανάλυση της χρησιμοποιούμενης μεθόδου.
Στο τελευταίο τμήμα περιγράφονται οι πειραματικές μετρήσεις που διεξήχθησαν με το σύστημα που κατασκευάστηκε, στον εργαστηριακό πάγκο και επί του οχήματος της εφαρμογής. Τέλος, γίνεται ανάλυση των αποτελεσμάτων που προέκυψαν.The subject of this work includes the use of hybrid technology in automotive. An extensive analysis of hybrid vehicles is carried out, referring to the history of hybrid and other vehicles and then to the environmental matters that brought hybrids to the fore. The analysis also includes the study of different types of hybrid vehicles, examining their components and ends with the presentation of some remarkable vehicles that have been produced. The work then passes into the experimental phase, involving the design and construction of an electric system to be applied in a conventional vehicle. The vehicle is meant to function as a hybrid, using two energy sources, fossil fuels and electricity. For the reason, a vehicle has been supplied along with the necessary parts of the system, which consist of an asynchronous electric motor and lead acid batteries. Mechanical modifications that were made to the chassis to accept the additional drivetrain are discussed in detail. The construction of the necessary power converters is carried out in parallel. Their purpose is to adjust the electrical values in order to allow the flow of power from the batteries to the engine during acceleration of the vehicle and return energy to the batteries from the electrical machine, which acts as generator powered from the vehicle’s wheels.. The required converters are: a bi-directional buck/boost DC to DC converter and a three-phase DC to AC converter, which is simply described as inverter. The second converter also performs the control of the torque produced at any time from the engine, using Direct Torque Control (DTC). Alternate methodologies are also described, while the used technique is fully analyzed. The final section describes the experimental procedures performed to the constructed systems. At first they are tested in the laboratory and afterwards they are applied on the vehicle. Finally, an analysis of the results is performed.
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Chang, Hung-wei, and 張宏瑋. "Integrated Single-Inductor Buck-Boost or Boost-Boost DC-DC Converter with Power-Distributive Control." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/64745666692791543442.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
97
This paper presents a fully integrated single-inductor dual-output (SIDO) buck-boost or boost-boost DC-DC converter with power-distributive control. This converter works under voltage mode control to have better noise immunity, uses fewer power switches/external compensation components to reduce cost, and is thus suitable for system on chip (SoC) applications. The proposed SIDO converter was fabricated in TSMC 0.35μm 2P4M CMOS technology with input supply voltage 2.7-3.3 V. The first output VO1 can operates either at buck mode or boost mode (output voltage in between 2.5V to 5V), while the second output VO2 can only operates at boost mode (output voltage 3.6V).
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Chen, Chih-Chiang, and 陳志強. "Hysteresis-Current-Controlled Buck/ Buck-Boost Converter Using Active Current Sensing Circuit." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/7q3egk.
Full textAbstract:
碩士國立臺北科技大學
電腦與通訊研究所
94
In this thesis, We design a new active current sensing circuit and apply this technology fo hysteresis-current-controlled buck/buck-boost converter using active current sensing circuit for portable applications. In the proposed DC-DC converter, the key building blocks includes power MOS, Voltage-current conversion circuit, hysteresis-current comparator, driving circuit, non-overlapping circuit and current sensing circuit. The current sensing circuit can fully sense the inductor current and be used to construct buck/buck-boost converter. The hysteresis-current-controlled can be worked in parallel. The proposed circuits have been designed with TSMC 0.35um DPQM CMOS processes. The experimental results show that the buck/ buck-boost converter works well with the following features: the maximum inductor current up to 750mA; the input voltage range is 3~6V; the output voltage range from 0.45 to input voltage-0.4V; the maximum power efficiency up to 93.6%.
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Ασημακόπουλος, Παναγιώτης. "Μελέτη και κατασκευή κινητήριου συστήματος υβριδικού οχήματος : ενεργειακή διαχείριση μέσω ηλεκτρονικών μετατροπέων ισχύος." Thesis, 2009. http://nemertes.lis.upatras.gr/jspui/handle/10889/2576.
Full textAbstract:
Η μόλυνση του περιβάλλοντος από τα μέσα μεταφοράς και η συνεχής μείωση των αποθεμάτων των ορυκτών καυσίμων αποτελούν τους δύο κύριους λόγους για τη στροφή των τμημάτων έρευνας της παγκόσμιας αυτοκινητοβιομηχανίας στην επινόηση οικολογικότερων μέσων μετακίνησης. Από αυτή την προσπάθεια προέκυψαν τα ηλεκτρικά υβριδικά οχήματα, τα οποία περιορίζουν την κατανάλωση καυσίμου και τις εκπομπες ρύπων συγκριτικά με συμβατικά οχήματα παραπλήσιων τεχνικών χαρακτηριστικών. Τα υβριδικά οχήματα είναι, ουσιαστικά, ο προάγγελος και το πεδίο δοκιμής και εξέλιξης της αμιγούς ηλεκτροκίνησης.
Ο κοινός στόχος της παρούσας διπλωματικής εργασίας και άλλων δύο διπλωματικών εργασιών, οι οποίες εκπονήθηκαν παράλληλα με αυτή, είναι η μετατροπή ενός συμβατικού βενζινοκίνητου αυτοκινήτου σε ηλεκτρικό υβριδικό όχημα. Το αρχικό μέλημα υπήρξε η εύρεση του κατάλληλου οχήματος για τη συγκεκριμένη εφαρμογή. Την προμήθεια του οχήματος ακολούθησε η έρευνα της αγοράς για την εύρεση του κατάλληλου ηλεκτρικού κινητήρα. Ο κινητήρας, ο οποίος επιλέχθηκε, είναι τριφασικός ασύγχρονος. Εν συνεχεία, αγοράστηκαν συσσωρευτές οξέος μολύβδου ως εναλλακτική πηγή ενέργειας του οχήματος.
Ακολούθησε εμπεριστατωμένη μελέτη για τη μηχανολογική προσαρμογή του ηλεκτρικού κινητήρα και των συσσωρευτών στο όχημα και πραγματοποιήθηκε αυτή η εργασία. O ηλεκτρικός κινητήρας τοποθετήθηκε επί του διαφορικού, ενώ κατασκευάστηκε ειδική βάση για τους συσσωρευτές. Υπολογίστηκε και κατασκευάστηκε κατάλληλο σύστημα μετάδοσης για τη μεταφορά της κίνησης από τον κινητήρα στον άξονα μετάδοσης της κίνησης του οχήματος, ώστε να ανταποκρίνεται στις ανάγκες κίνησης του. Το γεγονός ότι ο κινητήρας χρειάζεται σύστημα υδρόψυξης για την ασφαλή και αποδοτική λειτουργία του είχε ως αποτέλεσμα την κατασκευή κατάλληλης διάταξης.
Το δεδομένο ότι οι συσσωρευτές παράγουν συνεχές ρεύμα, ενώ ο κινητήρας απαιτεί τροφοδοσία με εναλλασσόμενο ρεύμα οδήγησε στην κατασκευή ενός τριφασικού αντιστροφέα ισχύος. Ο αντιστροφέας αποτελεί μια ηλεκτρική διάταξη, η οποία μετατρέπει το συνεχές ρεύμα σε εναλλασσόμενο. Το απαιτούμενο επίπεδο τάσης εξόδου του αντιστροφέα για την τροφοδοσία του κινητήρα προϋποθέτει συγκεκριμένο επίπεδο τάσης στην είσοδο του μετατροπέα, το οποίο είναι υψηλότερο από την τάση εξόδου της συστοιχίας των συσσωρευτών. Επιχειρήθηκε, λοιπόν, η εξομοίωση και η κατασκευή ενός αμφικατευθυντήριου μετατροπέα συνεχούς τάσης σε συνεχή. Η ιδιότητα του είναι η ανύψωση του επιπέδου τάσης των συσσωρευτών κατά τη φάση της τροφοδότησης του κινητήρα αλλά και ο υποβιβασμός της τάσης για τη φόρτιση των συσσωρευτών κατά την επιστροφή ενέργειας από τη λειτουργία του κινητήρα ως γεννήτρια, τη λεγόμενη διαδικασία της αναγεννητικής πέδησης. Ο έλεγχος του ηλεκτρικού κινητήρα πραγματοποιήθηκε μέσω της τεχνικής του άμεσου ελέγχου ροπής (DTC), ενός είδους άμεσου διανυσματικού ελέγχου.The environmental pollution caused by all means of transport and the continued reduction of stocks of fossil fuels are the two main reasons, which directed the global automotive research in developing “greener” means of transport. From this effort emerged hybrid electric vehicles, which reduce fuel consumption and emissions compared to conventional vehicles with similar technical characteristics. Hybrid vehicles are essentially the precursor and the field for testing and developing pure electric traction. The common objective of this and two other diploma theses, which were prepared in parallel with it, is to convert a conventional gasoline car to a hybrid electric one. The initial concern was to find a suitable vehicle for this application. The supply of the vehicle was followed by the market research to find a suitable motor. The selected motor is a three-phase asynchronous motor. Subsequently, lead acid batteries were purchased as an alternative energy source for the vehicle. This was followed by a thorough study of the mechanical adjustment of the electric motor and battery in the vehicle and the planned work was performed. The electric motor is adapted on the differential and a base was constructed to fit the batteries. A suitable transmission system was built to transmit motion from the electric motor to the transmission axle of the vehicle to meet the needs of the driving conditions. The fact that the motor needs a water cooling system for its safe and efficient operation resulted in the construction of an adequate array. Taking into account that the batteries produce direct current, while the motor requires the supply of alternating current led to the design and construction of a three-phase power inverter at the laboratory. The inverter is an electrical device that converts direct current to alternating current. The demanded level of voltage in the inverter’s output to power the motor requires a specific voltage level at the input of the converter, which is higher than the output voltage of the battery pack. Therefore, the simulation and the construction of a bidirectional DC to DC voltage converter was attempted at the laboratory. The aim is to raise the level of battery voltage during the phase of the electric machine functioning as a motor and to reduce the voltage level to charge the batteries during the phase that the electric machine functions as a generator, a process called regenerative braking. The control of the electric motor was achieved by the technique of direct torque control (DTC), a kind of direct vector control.
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Μπούμης, Θεόδωρος. "Μελέτη και κατασκευή κινητήριου συστήματος υβριδικού οχήματος : σχεδιασμός και κατασκευή ηλεκτρονικού μετατροπέα ισχύος." Thesis, 2009. http://nemertes.lis.upatras.gr/jspui/handle/10889/2577.
Full textAbstract:
Η παρούσα διπλωματική εργασία πραγματεύεται τη μετατροπή ενός συμβατικού αυτοκινήτου σε υβριδικό ηλεκτρικό όχημα. Προς αυτή την κατεύθυνση, μελετάται και κατασκευάζεται το ηλεκτροκινητήριο σύστημα του οχήματος, το οποίο έχει τοπολογία παράλληλης διάταξης. Τα υποσυστήματα που το συνθέτουν είναι ένας τριφασικός ασύγχρονος ηλεκτρικός κινητήρας, μία συστοιχία ηλεκτροχημικών συσσωρευτών και οι απαραίτητοι ηλεκτρονικοί μετατροπείς ισχύος. Το υβριδικό όχημα διαθέτει τη δυνατότητα επιστροφής ενέργειας κατά την επιβράδυνση, φορτίζοντας τους ηλεκτροχημικούς συσσωρευτές (αναγεννητική πέδηση).
Για την προσαρμογή του ηλεκτροκινητήριου συστήματος στο υπάρχον συμβατικό κινητήριο σύστημα του αυτοκινήτου έλαβαν χώρα ορισμένες μηχανολογικές μετατροπές και κατασκευάστηκε ένα σύστημα υδρόψυξης για τον ηλεκτροκινητήρα.
Για τη ενεργειακή διαχείριση του όλου συστήματος έγινε εμπεριστατωμένη ηλεκτρολογική μελέτη. Για την τροφοδοσία του τριφασικού ασύγχρονου κινητήρα σχεδιάστηκε και κατασκευάστηκε ένας ηλεκτρονικός μετατροπέας ισχύος συνεχούς τάσης σε τριφασική εναλλασσόμενη τάση (τριφασικός αντιστροφέας). Για τη λειτουργία του τριφασικού κινητήρα σε επίπεδα ονομαστικής ισχύος απαιτήθηκε η ανύψωση της συνεχούς τάσης των μπαταριών και για αυτό το λόγο έγινε σχεδιασμός, προσομοίωση και κατασκευή ενός αμφικατευθυντήριου ηλεκτρονικού μετατροπέα ανύψωσης/υποβιβασμού συνεχούς τάσης σε συνεχή τάση. Ο έλεγχος της ηλεκτρικής μηχανής υλοποιείται από την μέθοδο Αμέσου Ελέγχου Ροπής (DTC), η οποία αποτελεί ένα είδος αμέσου διανυσματικού ελέγχου.
Παράλληλα με αυτή τη διπλωματική εργασία, εκπονήθηκαν δύο ακόμα διπλωματικές εργασίες πάνω στο θέμα του υβριδικού οχήματος.The present diploma thesis deals with the conversion of a conventional car to a hybrid electric vehicle (HEV). To this direction, the powertrain of the vehicle is designed and constructed, composing a parallel hybrid topology. The subsystems of the electric propulsion system are a three-phase asynchronous electric motor, an electrochemical battery pack and the necessary power electronic converters. The hybrid electric vehicle has the ability to return energy and charge the batteries during deceleration (regenerative braking). In order to adapt the electrical compounds to the existing conventional propulsion system, some mechanical modifications had to be made. Furthermore, a water cooling system was designed and constructed in order to cool the electric motor. The energy management of the electrical system is analysed. The power of the three-phase asynchronous motor is controlled by a three-phase DC to AC inverter. The operation of the motor at its nominal power requires the boost of the battery voltage level. For this reason, a bidirectional DC to DC boost / buck converter was firstly simulated to ensure its proper operation. The above power converters were designed and constructed at the laboratory. The control of the electric motor is implemented by the Direct Torque Control method (DTC), which is a kind of direct vector control. In parallel with this work, two more diploma theses were prepared on the project of the hybrid electric vehicle.