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Dissertations / Theses on the topic 'Switch-mode power supply'
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Petkov, Roumen Dimitrov. "High power switched mode magnetron power supply systems for industrial microwave heating applications." Thesis, Teesside University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259645.
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Kaya, Ibrahim. "A Switch Mode Power Supply For Producing Half Wave Sine Output." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609781/index.pdf.
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In this thesisanalysis, design and implementation of a DC-DC converter with active clamp forward topology is presented. The main objective of this thesis is generating a rectified sinusoidal voltage at the output of the converter. This is accomplished by changing the reference signal of the converter. The converter output is applied to an inverter circuit in order to obtain sinusoidal waveform. The zero crossing points of the converter is detected and the inverter drive signals are generated in order to obtain sinusoidal waveform from the output of the converter. Next, the operation of the DC-DC converter and sinusoidal output inverter coupled performance is investigated with resistive and inductive loads to find out how the proposed topology performs. The design is implemented with an experimental set-up and steady state and dynamic performance of the designed power supply is tested. Finally an evaluation of how better performance can be obtained from this kind of arrangement to obtain a sinusoidal output inverted is thoroughly discussed
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Kutluay, Koray. "Fully Digital Parallel Operated Switch-mode Power Supply Modules For Telecommunications." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606640/index.pdf.
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Digitally-controlled, high power universal telecommunication power supply modules have been developed. In this work, the converter control strategy, and its design and implementation first, by means of parallel-operated, dual, 8-bit microcontrollers, and then by using a high processing power digital signal processor (DSP) have been emphasized. The proposed dual-processor based digital controller provides an extended operating output voltage range of the power supplies, user programmable current limit setting, serial communication based active load current sharing with automatic master-slave selection among parallel-operated modules, user selectable number of back-up battery cells,
programmable temperature compensation curves, and automatic derating without extra hardware requirement. Overload and output short-circuit protection features are also controlled by software.
One of the processors in the digital controller is employed for user interface purposes such as long term records, display, and alarm facilities, and remote control, which are inherently slow processes. The fast processing speed required by output voltage setting, current limit, and load current sharing however is to be fulfilled by a second processor dedicated to the adjustment of output voltages of modules. Tight dynamic load regulation requirement of a telecommunication power supply has been fulfilled by a 150 MIPS DSP, in place of a low cost, 8-bit microcontroller.
The implemented digitally-controlled, 1.8 kW, 0-70V telecommunication power supplies have been tested successfully in several locations in the field.
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Nasir, Nasir. "Development of novel low noise switch-mode power supply designs for high fidelity audio power amplifiers." Thesis, Bournemouth University, 2017. http://eprints.bournemouth.ac.uk/29795/.
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Today, linear power supplies are widely used to provide the supply voltage rail to an audio amplifier and are considered bulky, inefficient and expensive due to the presence of various components. In particular, the typical requirements of linear designs call for physically large mains transformers, energy storage/filtering inductors and capacitors. This imposes a practical limit to the reduction of weight in audio power systems. In order to overcome these problems, Switch-mode Power Supplies (SMPS) incorporate high speed switching transistors that allow for much smaller power conversion and energy storage components to be employed. In addition the low power dissipation of the transistors in the saturated and off states results in higher efficiency, improved voltage regulation and excellent power factor ratings. The primary aim of this research was to develop and characterize a novel low noise switch mode power supply for an audio power amplifier. In this thesis, I proposed a novel balancing technique to optimize the design of SMPS that elevate the performance of converter and help to enhance the efficiency of power supply through high speed switching transistors. In fact, the proposed scheme mitigates the noise considerably in various converter topologies through different mechanisms. To validate the proposed idea, the technique is applied to different converters e.g; PFC boost converter, flyback converter and full-bridge converter. The performance of audio amplifier is evaluated using designed SMPS to compare with existing linear power supply. On the basis of experimental results, the decision has been made that the proposed balanced SMPS solution is as good as linear solution. Due to novelty and universality of balancing technique, it can provide a new path for researchers in this field to utilize the SMPS in all other audio devices by further enhancing its efficiency and reducing system noise.
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Xie, Manjing. "Digital Control for Power Factor Correction." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/34258.
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This thesis focuses on the study, implementation and improvement of a digital controller for a power factor correction (PFC) converter.
The development of the telecommunications industry and the Internet demands reliable, cost-effective and intelligent power. Nowadays, the telecommunication power systems have output current of up to several kilo amperes, consisting of tens of modules. The high-end server system, which holds over 100 CPUs, consumes tens of kilowatts of power. For mission-critical applications, communication between modules and system controllers is critical for reliability. Information about temperature, current, and the total harmonic distortion (THD) of each module will enable the availability of functions such as dynamic temperature control, fault diagnosis and removal, and adaptive control, and will enhance functions such as current sharing and fault protection. The dominance of analog control at the modular level limits system-module communications. Digital control is well recognized for its communication ability. Digital control will provide the solution to system-module communication for the DC power supply.
The PFC converter is an important stage for the distributed power system (DPS). Its controller is among the most complex with its three-loop structure and multiplier/divider. This thesis studies the design method, implementation and cost effectiveness of digital control for both a PFC converter and for an advanced PFC converter. Also discussed is the influence of digital delay on PFC performance. A cost-effective solution that achieves good performance is provided. The effectiveness of the solution is verified by simulation.
The three level PFC with range switch is well recognized for its high efficiency. The range switch changes the circuit topology according to the input voltage level. Research literature has discussed the optimal control for both range-switch-off and range-switch-on topologies. Realizing optimal analog control requires a complex structure. Until now optimal control for the three-level PFC with analog control has not been achieved. Another disadvantage of the three-level PFC is the output capacitor voltage imbalance. This thesis proposes an active balancing solution to solve this problem.Master of Science
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Šír, Michal. "Laboratorní napájecí zdroj s digitální řídicí jednotkou." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242115.
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This project deals with a design of power and control circuits for a laboratory power supply source, consisting of a continuous conduction mode active rectifier and DC/DC converter. Detailed design of input rectifier with active power factor correction, DC/DC converter and control circuits with their implementation to digital signal processor are the project results.
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Žamberský, Jan. "Zvyšující měnič napětí." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-241973.
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Práce se zabývá popisem jednotlivých typů zdrojů s důrazem na izolované topologie. Poté je rozebírána nejvhodnější volba pro zdroj na anodické bondování, kde jsou kladeny požadavky na vysoké výstupní napětí s malým proudem. Další část rozebírá problematická místa návrhu a na co je třeba dávat pozor. Poté je proveden vlastní návrh zdroje s popisem optimalizačních kroků. Tento zdroj je odsimulován. Dva rozdílné přístupy k realizaci takového zdroje jsou poté porovnány a nejlepší je vybrán. Je ukázána možnost, jak realizovat bipolární výstup. V poslední části je tento zroj sestaven a proměřeny jeho parametry.
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Baglan, Fuat Onur. "Design Of An Educational Purpose Multifunctional Dc/dc Converter Board." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12610103/index.pdf.
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In this thesis a multifunctional DC/DC converter board will be developed for utilization as an educational experiment set in the switched-mode power conversion laboratory of power electronic courses. The board has a generic power-pole structure allowing for easy configuration of various power converter topologies and includes buck, boost, buck-boost, flyback, and forward converter topologies. All the converters can be operated in the open-loop control mode with a switching frequency range of 30-100 kHz and a maximum output power of 20 W. Also the buck converter can be operated in voltage mode control and the buck-boost converter can be operated in peak-current-mode control for the purpose of demonstrating the closed loop control performance of DC/DC converters. The designed board allows for experimentation on the DC/DC converters to observe the macroscopic (steadystate/ dynamic, PWM cycle and low frequency) and microscopic (switching dynamic) behavior of the converters. In the experiments both such characteristics can be clearly observed such that students at basic learning level (involving only the macroscopic behavior), and students at advanced learning level (additionally involving the parasitic effects) can benefit from the experiments. The thesis reviews the switch mode conversion principles, gives the board design and proceeds with the experiments illustrating the capabilities of the experimental system.
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Tejmlová, Lenka. "Laboratorní zdroj s vysokou účinností." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219100.
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The project shows the problems of power supply in electrical engineering. It describes the general parameters of these types of supplies and presents their characteristics. Based on these findings, it is also focused on the selection of specific elements of the laboratory supply, to reach the given parameters. It contains the recalculations of the parameters of other additional components. The overall scheme of the supply is divided into several blocks, thematically corresponded to subchapters. According to the accomplished concept the laboratory supply is realized and its parameters had been tested. Projects results are assessed at the end.
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Botek, Lukáš. "Dvojčinný síťový spínaný zdroj." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-412970.
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This master´s thesis describes switch mode power supply and discusses the design of its individual parts. It also contains a simulation of the power part of the converter and a reseach in the area of DC/DC converters.
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Šlezingr, Jan. "Parametrizace mezních křivek odolnosti elektrických spotřebičů na krátkodobé poklesy a výpadky napětí." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217724.
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This master’s thesis work deal with diagnosis parameters immunity curves uniphase appliance on short - term voltage dips a interuption. Immunity curve is dependence smallest possible sizes RMS voltage for performance given to criteria function on time continuation voltage event. Curves of resistance is different for each electric appliance, and depending on the size and over-voltage network, the burden on resources and voltage during the event.. The goal of this work is to devise a methodology for measuring the implementation of parametric measurement limit curves of resistance for selected types of appliances.
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Folprecht, Martin. "Síťový spínaný zdroj." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-318189.
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Bodetto, Dallera Mirko Andrés. "Contribución al diseño de convertidores de tipo elevador-reductor para alimentación de sistemas de iluminación en leds." Doctoral thesis, Universitat Rovira i Virgili, 2015. http://hdl.handle.net/10803/312827.
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.En aquesta tesis doctoral es presenta el disseny i implementació d’un sistema d’alimentació ac-dc basat en convertidors de tipus elevador-reductor d’única etapa. El sistema s’ha dissenyat per regular el corrent d’alimentació d’un conjunt de LEDs connectats en sèrie. El sistema d’alimentaciódissenyat té la capacitat de mantenir constant el flux lumínic dels LEDs i permet la dimerització en un ampli rang de valors de corrent. Simultàniament, el sistema manté un nivell molt baix d’harmònics introduïts a la xarxa de corrent altern.
L’anàlisi ha demostrat la viabilitat en l’aplicació del control en mode lliscant per a la imposició d’un comportament como resistor lliure de pèrdues (LFR) en convertidors de tipus elevador-reductor d’ordre elevat (Ćuk, SEPIC i Shepard-Taylor) en els que es pretengui simultàniament regular el corrent de sortida. En aquest context, s’ha exposat en detall l’anàlisi dinàmic, i posterior disseny del llaç de regulació de corrent, del LFR basat en el convertidor Ćuk quan s’alimenta a través d’una font de corrent alterna de 230 Vrms-50 Hz.
Un dels problemes trobats ha estat l’aparició de distorsió a la forma d’ona del corrent d’entrada en els passos per zero. Aquesta distorsió impedeix, per baixes potències d’entrada, el compliment de la norma d’introducció d’harmònics i, per tant, limita el seu ús en aplicacions de dimerització. S’ha proposat una solució basada en la modulació de la finestra d’histèresi de tal forma que a la proximitat del pas per zero la freqüència de commutació del convertidor augmenta. Mitjançant aquesta tècnica es garanteix tant el compliment de las normes preceptives com un rang de dimerització del 0 al 100 %.
Las previsions teòriques s’han verificat mitjançant simulació i a partir de prototipus experimentals.En esta tesis doctoral se presenta el diseño e implementación de un sistema de alimentación AC-DC basado en convertidores de tipo elevador-reductor de única etapa. El sistema se ha diseñado para regular la corriente de alimentación de un conjunto de LEDs conectados en serie. Este tiene la capacidad de mantener constante el flujo lumínico de los LEDs y permite la dimerización en un amplio rango de valores de corriente. Simultáneamente, el sistema mantiene un nivel muy bajo de armónicos introducidos a la red de corriente alterna. El análisis ha demostrado la viabilidad en la aplicación del control en modo deslizante para la imposición de un comportamiento como resistor libre de pérdidas (LFR) en convertidores de tipo elevador-reductor de orden elevado (Ćuk, SEPIC y Shepard-Taylor) en los que se pretenda simultáneamente regular la corriente de salida. En este contexto, se ha expuesto en detalle el análisis dinámico, y posterior diseño del lazo de regulación de corriente, del LFR basado en el convertidor Ćuk cuando se alimenta a través de una fuente de corriente alterna de 230 Vrms-50 Hz. Uno de los problemas encontrados ha sido la aparición de distorsión en la forma de onda de la corriente de entrada en los cruces por cero. Dicha distorsión impide, para bajas potencias de entrada, el cumplimiento de la norma de introducción de armónicos y, por tanto, limita su utilización para aplicaciones de dimmerización. Se ha propuesto una solución basada en modulación de la ventana de histéresis de tal forma que en las cercanías del cruce por cero la frecuencia de conmutación del convertidor aumenta. Mediante esta técnica se garantiza tanto el cumplimiento de las normas preceptivas como un rango de dimerización del 0 al 100 %. Las previsiones teóricas se han verificado mediante simulación y a partir de prototipos experimentales.
In this thesis, the design and implementation of an ac-dc power factor correction system based on single-stage step up/down converters is presented. The system has been designed to regulate the supply current of a string of LEDs connected in series. The driver has the capability to maintain a constant luminous flux and to dimmer the LED in a wide range of current values. Simultaneously, the system maintains a very low level of current harmonics introduced into the AC mains. The analysis has demonstrated the feasibility in applying the sliding mode control for imposing simultaneously, at single-stage high-order converters (Ćuk, SEPIC and Shepard-Taylor), a Loss-Free Resistor (LFR) behavior and a regulated output current. In this context, it has been exposed in detail the dynamic analysis and the design of a current regulation loop for a Ćuk-based LFR supplied from a AC voltage source of 230 Vrms-50 Hz. One of the problems identified has been the presence of distortion in the input current waveform at the zero crossings. Such distortion prevents, for low input powers, the harmonics compliance and therefore limits their use in LED dimming. To overcome this problem, it has been proposed a technique, based on a variable hysteresis window, to improve the performance near the zero crossing of the input current. This improvement is achieved by increasing the switching frequency near this zero crossing region. With this technique, the dimming range goes from 0-100% maintaining at the same time very low harmonic distortion at the input current. Moreover, experimental and computer simulation results presented are given in order to verify the theoretical predictions.
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Johansson, Simon. "Design of power supplies for Piezo LEGS and SiC experiment : KTH Student satellite MIST." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-196216.
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KTH is funding a project whose goal is to send a satellite into space. This project is called MIST (Miniature Student Satellite) which is assembled by a team of students at KTH. On the satellite there are experiments that are invented by other teams, in two of those experiments a power supply is required. This thesis is a technical investigation on how to design the power supply to both of those experiments, which are called SiC and Piezo LEGS. Piezo LEGS will investigate how their nanosized motors will behave and function in a space environment. SiC will investigate how their silicone carbide transistors will be affected by the space environment. A team made of four other students was selected to produce SiC experiments and a PCB in which this work is included. A literature study was done to get a better understanding of how power supplies work and to know how to select a good power supply. When the power supplies were selected they were simulated to meet the requirements. The next step was to do a Printed Circuit Board(PCB) for the SiC experiment and Piezo LEGS to be able to test the power supplies functionality in the physical world. Both of the converters reached the required output and characteristics working on their respective PCB. More time is needed for long time testing and optimization on the PCB layouts.MIST (Miniature Student Satellite) är ett av KTH subventionerat projekt vilket har som mål att skicka upp en satellit i rymden. Projektet kommer omfatta flera olika experiment. Piezo LEGS ska undersöka en motors funktionalitet i rymdmiljö. SiC ska undersöka hur Silicon carbide halvledare och transistorer påverkas av rymdmiljön. Båda experimenten kräver varsin strömförsörjning för att fungera. Detta projekt ska undersöka kraven på strömförsörjning samt testa prototypen av ett kretskort för densamma. Först genomfördes en förstudie av de två typer av regulatorer som vanligtvis används som strömförsörjning, den linjära regulatorn och switch-mode regulatorn för att förklara olika strömförsörjningsteknologier, samt ta reda på de olika miljökraven. Baserat på förstudiens resultat erhölls kunskap för hur tester ska tas fram för funktionalitet av regulatorerna så att de når kraven för MIST för att sedan kunna producera de båda regulatorerna. Målet är att resultatet av simuleringarna på strömförsörjningen ska stämma överens med utfallet av kretskorten som produceras. Mätningar genomfördes på prototyp kretskort som visade att simuleringarna var korrekta och gav strömförsörjningen rätt resultat på kretskorten. Några av funktionerna på regulatorerna hann ej testas på grund av tidsbrist och mycket framtida arbete kvarstår.
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Ptáček, Karel. "Vysokonapěťové struktury pro galvanickou iziolaci v integrovaných obvodech." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-417477.
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Tato dizertační práce představuje novou techniku laterární rezonanční vazby, která je využita v návrhu galvanicky izolovaného posouvače úrovně, který je následně implementován v 800 V půlmůstkovém kontroléru pro průmyslové aplikace. Ve srovnání s tradičními galvanickými izolátory jsou výrobní náklady tohoto řešení nižší. Pro aplikace vyžadující vyšší úroveň galvanické izolace je popsán následný vývoj galvanicky izolovaného posouvače úrovně, který využívá pouze jeden galvanicky oddělený posouvač úrovní pro komunikaci v obou směrech, což výrazně snižuje plochu struktury izolátoru. Jako součást následného návrhu je představen galvanický izolátor který je schopen přenášet analogovou hodnotu napětí. Analogový izolátor byl testován v reálné aplikaci síťového spínaného zdroje jako náhrada standardního optočlenu. Tato konstrukce umožňuje integraci primárních a sekundárních obvodů v jednom pouzdře, což umožní snížit složitost a cenu spínaného zdroje.
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Tran, Manh Hung. "Vers de nouveaux modules de puissance intégrés." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00591079.
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Ce travail de thèse s'inscrit dans la démarche engagée depuis quelques années et concernant l'intégration monolithique en électronique de puissance avec pour objectif de faire émerger une nouvelle structure de bras d'onduleur plus compacte, plus fiable et plus performante. En s'appuyant sur des technologies à base de transistors " complémentaires " sur substrat N et P, la nouvelle structure étudiée présente de nombreux avantages vis-à-vis de la CEM conduite, de la simplification de commande rapprochée et de la mis en œuvre. Ces aspects sont abordés et validés de manières "théoriques" et expérimentales. Le point pénalisant concernant le rendement de la structure par l'introduction du transistor sur substrat P est également analysé et de nouvelles topologies sont proposées afin d'améliorer cette limitation. Des techniques d'alimentation pour la commande bipolaire offrant un niveau maximal intégration sont ainsi développées.
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Kotulič, Dominik. "Záznamového zařízení pro oblast civilního letectví." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-376993.
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In the thesis the design of the Data Storage System (DSS) is proposed with the respect to the V-Model methodology. The design is based on users requirements, from which the system requirements are created and the technical specification of the DSS is developed. In the technical specifications the functionality of the DMM and HMI DSS subsystems are described and sub-system requirements are assigned to them, then they are subdivided and assigned to individual DMM (Data memory module) and HMI hardware items. Moreover, requirements are analyzed on hardware items, specific electronic components, are selected and implemented into the block design of the DMM hardware. Based on the block design of hardware, the hardware of the DMM subsystem is designed, selectively simulated and implemented along with the printed circuit board. On the implemented hardware of the DMM subsystems measurements are performed in order to verify the basic functionality of the hardware and the calculated, assimilated and measured values are compared as well. At the end of the thesis there is a short description of the implementation of the software design and its use for basic initialization of the selected processor, together with the verification of its basic function - measuring the frequency of the internal clock sources and the clock domains. The work is completed by sending a message of defined parameters to the selected communication line and sapling it by an oscilloscope, so that the basic function of the DMM subsystem is verified.
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Mejecaze, Guillaume. "Analyse des destructions d'alimentations électroniques soumises à un courant impulsionnel fort niveau." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0204.
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Depuis plus d'une trentaine d'années, la menace d'impulsion électromagnétique provoquée par une explosion à haute altitude (IEMN-HA) d'une arme nucléaire est un sujet d'actualité avec les préoccupations croissantes de sécurité. L'IEMN-HA se couple de manière privilégiée sur les lignes aériennes de distribution en électricité permettant d'alimenter les habitations et les usines. Une fois couplée à ces lignes, la contrainte générée peut alors se propager de façon conduite jusqu'aux premiers systèmes qu'elle rencontrera, et les perturber voire les détruire. Dans la majorité des cas, ces systèmes sont les alimentations des appareils domestiques ou industriels. Dans ce cadre, les effets de destruction d'alimentations électroniques lors de l'injection d'un courant impulsionnel de forte amplitude sont étudiés grâce à un moyen d'injection appelé PIC pour Plateforme d'Injection en Courant. Une alimentation à découpage de type flyback, représentative d'une majorité des alimentations actuelles, a été conçue pour la thèse afin de maîtriser entièrement sa topologie et ses constituants. Les composants les plus susceptibles dans une alimentation à découpage ont été mis en évidence, et il a été montré qu'ils sont détruits à cause d'une amplitude trop importante de courant pendant une durée excessive par rapport aux maximums de leurs capacités. Des analyses aux rayons~X et au microscope optique ont été réalisées sur les composants pour aider à la compréhension. Celles-ci ont permis de fournir des premières hypothèses sur la cause de leur destruction, qui ont ensuite été confirmées par des mesures de courants et de tensions autour de chaque composant lors de l'injection de l'impulsion en entrée de l'alimentation. Enfin, le moyen d'injection ainsi que l'alimentation conçue ont été modélisés sous un logiciel de simulation électronique de type Spice. Cette thèse est la première étape d'un travail dont l'objectif final est de modéliser la susceptibilité des alimentations à découpage afin de prédire leur niveau de destructionFor thirty years, the threat of electromagnetic pulses caused by a high-altitude nuclear explosion (NEMP / HEMP) is still an actual concern in the field of security and safety. NEMP couples efficiently on aerial lines of the electricity network allowing to supply houses and factories. Once coupled to these lines, the generated interference can then be propagated to the first encountered systems and disturb or destroy them. In most cases, these systems are household or industries appliances power supplies. In this context, destruction effects of electronic power supplies due to high level current pulse injectionare studied thanks to an injection generator called PIC for Current Injection Platform. A flyback switch mode power supply (SMPS), representative of a majority of common power supplies, has been designed for the thesis in order to fully control its topology and components. The most susceptible components in SMPS have been identified and have been destroyed due to a too high level current over an excessive duration compared to their maximum ratings. These understandings have been supported by X-rays and optical microscope analyzes. These ones allowed to provide first hypotheses on their destruction cause, which were then confirmed by current and voltage measurements on each component during the pulse injection. Finally, PIC and the designed SMPS have been modeled using a Spice electronic simulation software. This thesis is the first step of a work whose final objective is to model the susceptibility of SMPS in order to predict their destruction level
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Laouamri, Khaled. "Contribution à l'intégration des composants passifs d'une alimentation à découpage." Grenoble INPG, 2001. http://www.theses.fr/2001INPG0090.
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Les travaux présentés dans ce mémoire s'inscrivent dans une thématique nouvelle pour 1*équipe Electronique de Puissance du LEG : "l'intégration hybride des composants passifs". Us portent sur la conception de composants passifs et s'attardent sur leur modélisation, leur réalisation et leur caractensation. Ces composants seront employés au sein d'un convertisseur AC-DC à prélèvement sinusoïdal qui servira de support à notre étude. Il ressort d'une évaluation de quelques convertisseurs que la structure à résonance série se prête bien à l'intégration. Les effets des interactions électriques en haute fréquence ont été pris en compte grâce à une nouvelle formulation axisymétrique. Cette dernière couplée avec les équations de circuit électrique s'avère bien adaptée pour la caractérisation électromagnétique des composants magnétiques. Les travaux de modélisation des composants passifs, développés au LEG, ont permis de caractériser la structure LCT en prenant en compte tous les aspects utiles de son comportement. Cela a conduit, en particulier, à l'évaluation des pertes dues au diélectrique. Les mesures ont montré que la structure LCT intégrée apporte surtout une meilleure compacitéThe work presented in this report deals with a new set of thèmes for the Power Electronic team of the LEG: "the hybrid intégration of the passive components". They relate to the design, the modeling, the realization and the characterization of the integrated passive components. Thèse components will be employed within AC-DC converter used as support to our study. It cornes out from an évaluation of some converters that the séries résonant structure is well suitable to intégration. Thanks to a new axisymmetric formulation both of electric , magnetic and coupled effects are considered, ail geometrical and frequency effects are taken in account. This formulation, enabling coupling with electric circuit équations, proves to be well adapted for the electromagnetic characterization of the magnetic components. Works, about modeling of passive components, developed in the LEG made possible to characterize the realized LCT structure by taking into account ail phenomena. This has led, in particular, to dielectric losses évaluation. Measurements showed that integrated structure LC^brings especially a better compactness
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Pešl, Jiří. "Spínaný zdroj se spínáním při nulovém napětí." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242009.
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Diploma thesis describes the design of an switched mode power supply with switching at zero voltage for driving the anode of Anode-layer type ion source. First aim of thesis is ion sources and specialy Anode-layer type of ion source in detail. Main aim of thesis are important aspects of the design of switching mode power supply, which comes later the detailed construction of an switched mode power supply with output voltage 2800 V at output power 2800 W.
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Long, Tsai Ching, and 蔡慶龍. "EMI Filter Design of Switch Mode Power Supply." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/04177711748703268798.
Full textAbstract:
碩士國立臺灣科技大學
電子工程技術研究所
86
In this thesis, the sources of conducted noises are analyzed and the EMI filter for switch mode power supply is designed. The EMI filter design procedure is based on the analysis of the equivalent circuits of common-mode (CM) and differential-mode (DM) noises and the use of a developed noise separator. In this thesis, the characteristics of EMI filter elements are also explored. For illustration, the EMI filter design examples of a 250W single-switch and a 50W two-switches rectifier circuits have been give
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Yeh, Hsiao-I., and 葉孝益. "Control Analysis and Study of Power Factor for Switch-Mode Power Supply Systems." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/73005238827180620222.
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碩士國立清華大學
動力機械工程學系
91
The fast development of high-level computers has promoted the growing demands for switch-mode power supplies with high energy density and efficiency recently. Hence, the switch-mode power supplies operated at high frequency have evidently dominated over the conventional linear power supplies. However, sinusoidal ac currents chopped by the high speed switching devices into current pulses would not only affect the stability of the circuits but also deteriorate the power factor with more energy losses. Thus, the improvement on the power factor of switch-mode power supplies has been the common goal and incentive in the industry. In this thesis, average current control mode has been employed for simulating the complete power circuits with the help of EDA software, namely Pspice, on analyzing circuits and modeling devices such that stability and high power factor can be achieved. Moreover, the paralleling of power supplied has been studied for correcting the power factor with optimized operational regions under power overload conditions. The results are promising for the future applications of simulation in PFC circuits.
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顏上進. "Design and Implementation of Switch-Mode Power Supply for Biochemical Instruments." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/39478437734321120779.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
90
A switch-mode power supply for biochemical instruments is presented in this thesis. A cascade structure consisting of the buck converter and the half-bridge converter is used in the presented scheme, to provide the desired DC power for the biochemical instruments. To effectively restrain the inherent switching loss, the half-bridge converter is implemented by using zero voltage switching technique for a higher efficiency. The control circuit used in this paper can fulfill the functions of an adjustable voltage output, a fixed current output and a fixed power output. Finally, the proposed functions are confirmed with the computer simulations and experimental results.
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Lai, Zhi Ping, and 賴致平. "Implementation and EMI phenomena of high current DC switch-mode power supply." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/85618639455123027802.
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Ahsanuzzaman, S. M. "Interactive Flexible Switch Mode Power Supplies for Reducing Volume and Improving Efficiency." Thesis, 2012. http://hdl.handle.net/1807/35546.
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The purpose of this thesis is to introduce a family of interactive Switch Mode Power Supplies (SMPS) for reducing the overall volume of the conventional converter topologies in low-to-medium power (up to 60W) applications. As shown in this thesis, the interaction between power supplies and electronic devices can be incorporated with emerging digital controllers for SMPS, to implement flexible converter topologies. These flexible topologies dynamically change the converter configuration, based on the load requirement, to provide near ideal transient response and/or improved efficiency over a wide range of operating conditions. This interaction relaxes the energy storage requirement for the converter reactive components and results in a low volume implementation. The interaction with the SMPS can be between the electronic load and the power supply or different conversion stages of a multi-stage converter. The effectiveness of the introduced family of SMPS is verified on digitally controlled dc-dc and ac-dc converter topologies.
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Lin, Jing-Yuan, and 林景源. "Study and Implementation of A Switch-Mode Power Supply for Wide-Range Load Variation." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/20605497733660791284.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
92
Abstract A switch-mode power supply for biochemical instruments is presented in this thesis. A cascade structure consisting of the buck converter and the full-bridge phase-shifted PWM converter is used in the presented scheme, to provide the desired DC power for the biochemical instruments. To effectively restrain the inherent switching loss, the full-bridge phase-shifted converter is implemented by using zero voltage switching technique for a higher efficiency. The control circuit used in this paper can fulfill the functions of an adjustable voltage output. Finally, the proposed functions are confirmed with the computer simulations and experimental results.
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MING-HUNG, SUN, and 孫銘宏. "Electromagnetic Interference Emission Automatic Measurement and Filter Design for Switch-mode Rectifier Power Supply." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/75909083617749637320.
Full textAbstract:
碩士義守大學
電子工程學系
91
In this thesis, a PC-based automatic measurement and filter design system for the electromagnetic interference emission of SMR is developed. The man-machine interface is written in LabVIEW graphical programming language. The effort of solving the conductive EMI is greatly reduced by the fast computing speed and the friendly man-machine interface of the PC. The emission measurement and suppression procedure established can accomplish the reduction of the developing period and cost. Not only the production is speeded up, but also the acceptability of the SMR manufacturers can increase. Finally, in order to verify the feasibility of the developed system, a 3kW SMR is taken as the equipment under test (EUT). The resulted EMI can be successfully solved and make SMR meet VDE Class B limit.
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Radic, Aleksandar. "Practical Volume-reduction Strategies for Low-power High-frequency Switch Mode Power Supplies." Thesis, 2014. http://hdl.handle.net/1807/44131.
Full textAbstract:
The miniaturization of dc–dc switch-mode power supplies (SMPS) is of a key importance in volume-sensitive portable devices, such as cell phones, tablet computers, and digital cameras. In these systems, multiple SMPS are required to provide well regulated voltage and power to various electronic components such as the central processing unit (CPU) and random-access memory (RAM). The combined volume, weight, and surface area footprint of these SMPS is usually the largest component.
Traditionally, SMPS volume reduction has been achieved through increased switching frequencies; however, for power-sensitive applications this is undesirable due to the increased switching losses. This thesis presents two alternative, power-efficient, SMPS miniaturization methods: one control and one topology based.
The presented controller recovers from load transients with virtually minimum possible output voltage deviation, reducing the reactive component size. The controller utilizes a simple algorithm, requiring no knowledge of the converter parameters and virtually no processing power. The simplicity of the control concept enabled the design of an area and power efficient integrated circuit (IC) implementation.
The entire IC is implemented in a CMOS 0.18µm process on a 0.26 mm2 silicon area, which is comparable to the state-of-the-art analog solutions. For the experimental system the deviation (output capacitor size) is about four times smaller than that of a fast PID compensator having a 1/10th of the switching frequency bandwidth.
The second solution is a complementary converter topology that has a smaller output filter volume, improved dynamic response, and lower switching losses compared to the state-of-the-art solutions. To reduce the volume and switching losses, the input-to-output voltage difference is decreased with a capacitive attenuator that replaces the input filter capacitor and has approximately the same volume. Both the attenuator and the downstream buck converter share the same set of switches, minimizing conduction losses. A single multi-mode digital controller governs operation of both stages, seamlessly regulating the output and input center-tap voltages. Experiments with a 5–1.5-V, 2.5-A, 1-MHz prototype show that, compared to the conventional buck, the merged topology has 43% smaller inductor, 36% smaller output capacitor, up to 30% lower power losses, and a 25% faster transient response.
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Chen, Yu, and 陳煜. "The Study of GaN-HEMTs on Power Conversion and the High Efficiency Switch-Mode Power Supply Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/22838037171328973153.
Full textAbstract:
碩士國立交通大學
機械工程系所
104
This study presents design and performance evaluation of 100W DC/DC boost converter and 90W AC/DC adapter based on cascoded GaN-HEMTs power device operated at 500 KHz and 250 KHz switching frequency respectively. In high frequency circuits, proper selection of MOSFETs is required in order to have low gate drive power consumption so that high energy efficiency of the converter can be achieved. Even though Si MOSFET has already known for its popularity in low to medium power converters and high frequency applications, GaN HEMTs device could produce better results. This can be done by reducing the total switching loss, conduction loss because of its low Rds-on and gate drive power consumption of the converter as a result of low gate charge, Qg. The experimental results reveal that GaN HEMTs can produce higher energy savings including gate drive power by gaining approximately 4% efficiency compared to its counterpart, Si MOSFET in a regulated 90 W isolated AC/DC converter. In addition, the converter circuit operated at higher frequencies makes it possible to reduce the size of the energy storage elements such as capacitors, inductors and transformers which in turn results in the compact size, weight, volume and the increased power density of the converter.
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Tarulli, Massimo. "New Generation of Programmable Neuroprostheses - Switched Mode Power Supply Functional Electrical Stimulator." Thesis, 2009. http://hdl.handle.net/1807/30133.
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Functional electrical stimulation (FES) devices have direct applications in the realm of rehabilitation engineering, physiotherapy, occupational therapy and medicine for research, diagnostic and therapeutic purposes. This thesis presents a novel electrical stimulator for use in a FES system. The stimulator produces regulated current pulses using two switched mode power supplies (SMPS) in series. The first power stage - a flyback converter - steps up the supply voltage using primary side digital control. The second power stage is a buck converter with output current hysteretic control. An output switched capacitor circuit shapes the current pulses. All pulse variables are programmable and various pulses can be formed for virtually any FES application. Compared to previous FES devices, the pulses generated here are sharper, have faster rise time and the amplitude and temporal characteristics are more tightly regulated. A single channel prototype system is implemented and experimental results are shown.
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Madhuravasal, Vijayaraghavan G. "Extreme temperature switch mode power supply based on vee-square control using silicon carbide, silicon on sapphire, hybrid technology." 2009. http://digital.library.okstate.edu/etd/Madhuravasal_okstate_0664D_10472.pdf.
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Wang, Jing. "Digitally Controlled DC-DC Converters with Fast and Smooth Load Transient Response." Thesis, 2013. http://hdl.handle.net/1807/36063.
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Modern switch-mode power supplies (SMPS) used for point-of-load (PoL) applications need to meet increasingly stringent requirements on voltage regulation, while minimizing physical volume and optimizing conversion efficiency. The focus of this thesis is the voltage regulation capability of low-power PoL converters during load transients. The main objective is to investigate converter topologies and control techniques that can achieve fast and smooth transient performance without significant penalty in volume and efficiency. The digital control method is used due to its ability to implement sophisticated control algorithms. The first part of this thesis investigates a dual output stages converter, with a small auxiliary output stage connected in parallel with the main output stage. While the main output stage is responsible for steady-state operation and designed to achieve optimum efficiency, the auxiliary stage is activated when a load transient occurs, to help suppress voltage deviation. Experimental results on a 6 V-to-1 V, 3W buck converter shows 35% improvement in peak transient voltage deviation while maintaining the same efficiency profile, compared to an equivalent buck converter. The second part of this thesis introduces a flyback-transformer based buck (FTBB) converter. In this topology, the conventional buck inductor is replaced with the primary winding of the flyback transformer, an extra switch, and a set of small auxiliary switches on the secondary side. During heavy-to-light load transients the inductor current is steered away from the output capacitor to the input port, achieving both energy recycling and savings due to reduced voltage overshoots. The light-to-heavy transient response is improved by reducing the equivalent inductance of the primary transformer winding to its leakage value. Compared to an equivalent buck converter, experiment results on a 6 V-to-1 V, 3 W prototype show three times smaller maximum output voltage deviation during load transients and, for frequently changing loads, about 7% decrease in power losses.
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Frost, Damien F. "A PFC Power Supply with Minimized Energy Storage Components and a New Control Ttechnique for Cascaded SMPS." Thesis, 2012. http://hdl.handle.net/1807/33727.
Full textAbstract:
This Master of Applied Science thesis proposes a new design of low
power, power factor corrected (PFC), power supplies. By lifting the
hold up time restriction for devices that have a battery built in,
the energy storage elements of the converter can be reduced,
permitting a small and inexpensive power converter to be built. In
addition, a new control technique for controlling cascaded
converters is presented, named duty mode control (DMC). Its
advantages are shown through simulations. The system was proven
using a prototype developed in the laboratory designed for a
universal ac input voltage (85 - 265VRMS at 50 - 60Hz)
and a 40W output at 12V. It consisted of two interleaved phases
sensed and digitally controlled on the isolated side of the
converter. The prototype was able to achieve a power factor of
greater than 0.98 for all operating conditions, and input harmonic
current distortion well below any set of standards.
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Santiago, Alekssander Gomes. "Melhoria do desempenho das lâmpadas LED através de novo conceito de design, conceção, fabrico e utilização." Master's thesis, 2016. http://hdl.handle.net/10400.26/19028.
Full textAbstract:
Este projeto apresenta o conceito de um produto (Casquilho Eletrónico Ativo e Base Eletrónica
Ativa) para aplicação em iluminação geral com tecnologia de Luz em Estado Sólido, mais
conhecida por LED, acrónimo inglês para Light Emitting Diode (díodo emissor de luz). Neste
produto, através de simples reestruturação da construção das lâmpadas, sem desenvolvimento
de novas tecnologias, é alcançada a melhoria da eficiência das lâmpadas, melhoria do
desempenho, aumento da fiabilidade e do tempo de vida. É também obtida a redução dos custos
de fabrico, comercialização e reposição do produto em funcionamento, sem nunca comprometer
a fiabilidade do produto a segurança do utilizador.
Durante o trabalho é apresentado o contexto no qual todo o trabalho se enquadra, o estado da
arte da iluminação geral, as tecnologias atuais e o seu potencial futuro, o roadmap para a
iluminação LED como a tecnologia mais promissora e suas vantagens e limitações.
De seguida é apresentado o conceito de produto pensado, divido em varias fases: o
desenvolvimento do conceito, a implementação dos módulos constituintes e os ensaios
laboratoriais.
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Lukic, Zdravko. "Design and Practical Implementation of Advanced Reconfigurable Digital Controllers for Low-power Multi-phase DC-DC Converters." Thesis, 2012. http://hdl.handle.net/1807/33855.
Full textAbstract:
The main goal of this thesis is to develop practical digital controller architectures for multi-phase dc-dc converters utilized in low power (up to few hundred watts) and cost-sensitive applications. The proposed controllers are suitable for on-chip integration while being capable of providing advanced features, such as dynamic efficiency optimization, inductor current estimation, converter component identification, as well as combined dynamic current sharing and fast transient response.
The first part of this thesis addresses challenges related to the practical implementation of digital controllers for low-power multi-phase dc-dc converters. As a possible solution, a multi-use high-frequency digital PWM controller IC that can regulate up to four switching converters (either interleaved or standalone) is presented. Due to its configurability, low current consumption (90.25 μA/MHz per phase), fault-tolerant work, and ability to operate at high switching frequencies (programmable, up to 10 MHz), the IC is suitable to control various dc-dc converters. The applications range from dc-dc converters used in miniature battery-powered electronic devices consuming a fraction of watt to multi-phase dedicated supplies for communication systems, consuming hundreds of watts.
A controller for multi-phase converters with unequal current sharing is introduced and an efficiency optimization method based on logarithmic current sharing is proposed in the second part. By forcing converters to operate at their peak efficiencies and dynamically adjusting the number of active converter phases based on the output load current, a significant improvement in efficiency over the full range of operation is obtained (up to 25%). The stability and inductor current transition problems related to this mode of operation are also resolved.
At last, two reconfigurable digital controller architectures with multi-parameter estimation are introduced. Both controllers eliminate the need for external analog current/temperature sensing circuits by accurately estimating phase inductor currents and identifying critical phase parameters such as equivalent resistances, inductances and output capacitance. A sensorless non-linear, average current-mode controller is introduced to provide fast transient response (under 5 μs), small voltage deviation and dynamic current sharing with multi-phase converters. To equalize the thermal stress of phase components, a conduction loss-based current sharing scheme is proposed and implemented.