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1
Pekuz, Cagdas. "Z-source, Full Bridge Dc/dc Converter." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612775/index.pdf.
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The thesis is related to investigate characteristics and performance of a Z-source full
bridge dc/dc converter which boosts the input voltage to a higher output voltage. Zsource
structure increases the reliability of the converter according to current fed full
bridge dc/dc converter and also reducing the complexity according to two stage
design approach (boost followed by full bridge). Operating principles of the Z-source
dc-dc converter is described by current and voltage waveforms of the components
and mathematical expressions. Moreover, small signal models and transfer
functions are derived for both continuous current mode (CCM) and discontinuous
current mode (DCM) operations of the converter. Waveforms obtained,
mathematical expressions, small signal models and transfer functions derived are
confirmed by simulations. Performance of the converter and controller are both
tested in laboratory prototype.
2
Yan, Jinghui. "Full Bridge LLC Converter Secondary Architecture Study for Photovoltaic Application." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/82490.
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The increasing global energy demand calls for attention on renewable energy development. Among the available technology, the photovoltaic (PV) panels is a popular solution. Thus, targeted Power Conditioning Systems (PCSs) are drawing increased attention in research. Microconverter is one of the PCS that can support versatile applications in various power line architectures. This work focuses on the comparison of circuit secondary side architectures for LLC converter for microconverter application.
As the research foundation, general characteristic of solar energy and PV panel operation are introduced for the understanding of the needs. Previous works are referenced and compared for advantages and limitation. Base on conventional secondary resonant full bridge LLC converter, the two sub-topologies of different secondary rectification network: active, full bridge secondary and active voltage doubler output end LLC converter are presented in detail. The main operating principle is also described in mathematical formula with the corresponding cycle-by-cycle operation to ensure the functional equality before proceeding to performance comparison.
Circuit efficiency analysis is conducted on the main power stage and the key components with frequency consideration. The hardware circuit achieved the designed function while the overall hardware efficiency result agrees with analysis. In the implementation, the transformer is costume built for the system pacification. Another part is the parasitic effect analysis. At a high operating frequency and to achieve very high-frequency operation, parasitic effect need to be fully understood and considered as it may have the dominating effect on the system.Master of Science
3
Ucar, Aycan. "Design And Implementation Of Z-source Full-bridge Dc/dc Converter." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614667/index.pdf.
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In this work, the operating modes and characteristics of a Z-source full-bridge dc/dc converter are investigated. The mathematical analysis of the converter in continuous conduction mode, CCM and discontinuous conduction mode-2, DCM-2 operations is conducted. The transfer functions are derived for CCM and DCM-2 operation and validated by the simulation. The current mode controller of the converter is designed and its performance is checked in the simulation. The component waveforms in CCM and DCM-2 modes of operation are verified by operating the prototype converter in open-loop mode. The designed controller performance is tested with the closed-loop control implementation of the prototype converter. The theoretical efficiency analysis of the converter is made and compared with the measured efficiency of converter.
4
Ismail, Nasser. "A single stage full bridge power factor corrected AC/DC converter." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq26004.pdf.
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5
Feng, Yixue. "DC fault ride through operation of a full-bridge MMC converter." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/32426/.
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In recent years the growth of renewable energy has encouraged the development of HVDC grids. One challenge of building HVDC grids is the power converter response to DC side faults. The full-bridge Modular Multilevel Converter (MMC) is a desired power converter topology which is used in HVDC grids due to its scalability, modularity and capability of blocking DC side faults. Post fault operation of the full-bridge MMC requires the control of power flow, the energy of each sub-module capacitor and the elimination of circulating harmonic current to reduce power loss while DC line-to-ground or DC line-to-line faults exist. This thesis presents a post fault operation method for a full-bridge MMC in order to transmit partial power after a DC line-to-ground fault and provides reactive power after DC line-to-line fault. Simulated results are provide from a point-to-point HVDC system which consists of two eleven-level full-bridge MMC.
6
Roggia, Leandro. "Novo conversor CC-CC integrado full-bridge-forward aplicado a uma microrrede residencial." Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/3676.
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Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorThis Ph.D. Dissertation focuses on the proposal of a novel converter topology applied to the connection of an energy storage system, composed of a supercapacitor bank and a battery bank, to the dc bus of a residential microgrid. The proposed full-bridge-forward integrated dc-dc converter presents high voltage gain between the input and output, a fundamental requirement for the desired application, bidirectional power flow, galvanic isolation, among other features. The integration process, operation stages (including converter waveforms and equations), design methodology, dc modeling, among others, are presented. Three different clamping circuits structures are studied and applied to the proposed converter. Moreover, a comparison including several parameters with the dual active bridge converter, which is one of the most used topologies for similar applications is performed, highlighting the lesser number of active switches. Experimental results of the proposed converter in different operation modes are presented, validating the theoretical analysis. Experimental results of the dual active bridge converter are also presented and its performance is compared to the proposed converter, where it can be seen that the efficiency of the proposed converter is higher. The topology application is directed to microgrid systems, which attract high attention nowadays due to the possibility of renewable electric energy generation through distributed energy resources and with high reliability.
Esta Tese de Doutorado tem como foco a proposta de uma nova topologia de conversor aplicado para conexão de um sistema de armazenamento de energia, composto de um banco de supercapacitores e um banco de baterias, ao barramento CC de uma microrrede residencial. O conversor CC-CC integrado full-bridge-forward proposto apresenta alto ganho de tensão entre a entrada e saída, requisito fundamental para a aplicação desejada, fluxo de potência bidirecional, isolação galvânica, entre outras características. O processo de integração, etapas de operação (incluindo formas de onda e equações do conversor), metodologia de projeto, modelagem CC, entre outros, são apresentados. Três diferentes estruturas de circuitos grampeadores são estudadas e aplicadas ao conversor proposto. Além disso, uma comparação de diversos parâmetros com o conversor dual active bridge, que é uma das topologias mais utilizadas para aplicações semelhantes é realizada, destacando o menor número de interruptores. Resultados experimentais do conversor proposto em diferentes modos de operação são apresentados, validando as análises teóricas. Resultados experimentais do conversor dual active bridge também são apresentados e o seu desempenho é comparado ao do conversor proposto, onde se observa que o rendimento do conversor proposto é superior. A aplicação da topologia é voltada para sistemas de microrrede, os quais atraem grande atenção atualmente devido à possibilidade de geração de energia elétrica de maneira renovável através de fontes distribuídas e com elevada confiabilidade.
7
Kang, Wen. "A line and load independent zero voltage switching dc/dc full bridge converter topology." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ59307.pdf.
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8
Wu, Yue-Hua, and 吳岳樺. "Boost Converter Grafted with Full Bridge Isolated Converter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/85201666246561991259.
Full textAbstract:
碩士國立中正大學
電機工程研究所
102
This thesis presents design and implementation of an isolated dc/dc converter for renewable energy supply system. A boost converter grafted with full bridge isolated dc/dc converter is adopted. The graft method is used to integrate a boost converter with a full bridge isolated converter, which can save switching component and increase power density. Moreover, the front stage of the proposed converter can boost the voltage twice from the battery, which can reduce the turns ratio, size and power loss of the transformer. Moreover, the proposed converter can cover the voltage range from 31 V to 41 V. The active switches of the converter are operated with variable frequency and pulse-width modulation method to accommodate power variation. The front stage is operated in continuous conduction mode to reduce the current ripple. The rear stage is operated in discontinuous conduction mode to reduce inductor size and increase power density. A Renesas RX62T microprocessor realizes the functions of circuit protection, generation of PWM signals and A/D conversion, etc. If the load voltage drops below the nominal value, the converter is operated in discharging mode to regulate the load voltage. Finally, a 1kW converter has been implemented to verify the feasibility and its characteristics.
9
Patterson, Oliver Desmond. "Pseudo-resonant full bridge DC/DC converter." 1987. http://catalog.hathitrust.org/api/volumes/oclc/15634707.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 1987.Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 77-78).
10
Chiu, Szu-Yun, and 邱嗣允. "Asymmetrical Full Bridge Converter with Digital Cantrol." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/9aw67x.
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碩士國立臺灣科技大學
電機工程系
104
Full-bridge converters have been widely used in high-input-voltage, high-power applications. The symmetrical full-bridge converter has been used for a long time. However, it has large switching losses owing to its hard-switching operation, which impacts its conversion efficiency and limits its power density. To improve efficiency, the phase shift full-bridge converter (PSFB) has been proposed in the last three decades. Because it can achieve zero voltage switching (ZVS) operation, the switching turn-on losses are significantly reduced. To further improve efficiency, circulation loss can be reduced by asymmetrical control. Thus, the asymmetrical full-bridge converter (AFB) is proposed to achieve ZVS operation for a wide range of loads, and digitally controlled adjustable variable dead time can be achieved. In addition to the descriptions of the operation principle and design consideration, two hardware circuits—the AFB and AFB with digitally controlled adjustable variable dead time—with the same 300–400 V input and 12 V/ 360 W output specifications were built and compared.
11
PHAM, HIEU PHU, and HIEU PHU PHAM. "GaN Based 1MHz Phase Shifted Full Bridge Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/rba7t8.
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博士國立臺灣科技大學
電子工程系
106
The Power Supply Unit (PSU) for data center and telecommunication application typically handles from few hundreds Watt to few kilo Watts, that is composed of Power Factor Corrector (PFC) stage and frond-end DC-DC stage. For application such as telecommunication, the output voltage range is typically regulated at 48-60V from the 360- 400V input voltage source of PFC circuit. For high power application, the full bridge topologies, i.e. phase shifted full bridge (PSFB) converters are mostly used due to ability of carrying high current. The conventional PSFB converters have the drawbacks of narrow zero voltage switching (ZVS) operating range and high voltage stresses on the output rectifiers, which limit the operating of converter in MHertz switching frequencies. In this dissertation, the Tr-lead type PSFB converter employing two clamping diodes to overcome abovementioned issues is presented. The parasitic capacitor and reverse recovery characteristics of the output rectifiers that severely effect the performance of converter in high switching frequencies are discussed, together with the detailed analysis of both conventional and proposed converter. The solution of using enhanced mode Gallium Nitride wide band gap devices is introduced in order to overcome the drawback of Silicon based devices. Finally, a 480W 1MHz switching frequency prototype is built up and tested in laboratory. The experimental results show the ZVS achievement of switches in the wide range of load conditions, featuring the capability of operating in MHertz frequencies of this converter. The achieved peak efficiency of converter is up to 93% at full load condition
12
HSIEH, TSUNG-WEI, and 謝宗瑋. "Implementation of Bidirectional Full-Bridge CLLC Resonant Converter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/4n572k.
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碩士南臺科技大學
電機工程系
107
At first, this paper will introduce the Series Resonant Converter (SRC), LLC Converter and Bidirectional CLLC Converter. Furthermore, derived the equivalent circuit for forward mode and reverse mode of CLLC converter in order to design the resonant component of converter. This paper is implement a CLLC resonant converter is capable to applied in renewable energy low-voltage 48V lead-acid battery energy storage system. The CLLC resonant converter is provided with characteristic like bidirectional power transfer capability, zero voltage switching, high conversion efficiency and low EMI interference. Afterward, analyze the converter response in half of period. In this paper, the circuit simulation software PSIM is used to simulate the designed resonant CLLC Converter, and the forward and reverse mode voltage gain curves under different load conditions are drawn by PSIM. In addition, the high frequency transformer is fabricated according to each design parameter, and the resonant component parameters are adjusted for purpose of compensation the leakage inductance of high frequency transformer. During the experiment, the effect of insufficient reverse recovery speed of the MOSFET body diode was found. Therefore, the effects of various MOSFET reverse recovery capabilities on the current waveform were tested, and the converter's bidirectional and light load conversion efficiency were measured. At last, this paper implement a CLLC Converter of input 200V, output 42V~58V and rated power 500W.
13
XIE, ZONG-XIAN, and 謝宗憲. "Implementation of Modular Phase-Shifted Full-Bridge Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/wueqpz.
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碩士國立雲林科技大學
電機工程系
106
A modular phase-shifted pulse-width modulation (PWM) full-bridge converter with magnetic-coupling current-balancing (MCCB) cell for high input voltage and high output current applications is presented in this thesis. In high input voltage applications, the primary side of the proposed converter consists of three full-bridge circuits connected in series, and utilizes three split capacitors to limit the voltage stress on each modular at one third of input voltage. The input voltage auto-balance ability is achieved by introducing two flying capacitors. Additionally, in order to ensure each module can share load, the MCCB cells are used to make both the input-current sharing (ICS) and the output-current sharing (OCS) among constituent modules auto-balance. The methods of voltage and current balance are simple, reliable and easy expansion. Moreover, they also save redundant components and complex control circuits compared to conventional converters. For the purpose of low output voltage and high output current applications, the secondary side of the propose converter is composed of three current doubler rectifiers connected in parallel. Due to the diode currents and the output inductors currents are half of output load in each module, it can reduce conduction loss and increase the efficiency. Hence it can suppress the current rating of the transformer secondary winding. Finally, the operation principle and design consideration of the proposed converter are discussed in detail. The proposed converter is verified via simulation and experiments. Experiments with a prototype under 750~800 V input and 24V/60A output are provided to verify the theory analysis.
14
Guan, Yeh, and 關曄. "High Power Isolated Full- Bridge DC-DC Converter." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/35323514260858630489.
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碩士國立清華大學
電機工程學系
93
The full-bridge converters has been found widely use in many applications. With the increment of system power ratings, the soft-switching technique has become much more emphasized. The loss limited full bridge converter has been chosen for the system in this thesis, and the concept of multi-turn coaxial winding transformer is adapted to the system isolation transformer. Two different multi-turn coaxial winding transformer designs is analyzed and fabricated. Several simulations have been made to verify the system. The SYNOPSYS Saber Designer is used to simulate the primary switching waveforms of the full-bridge zero-voltage-switching circuit. Simulation results by using the ANSOFT Maxwell 2D Field Simulator is also provided to verify the multi-turn coaxial transformer design. An elementary test has been made to verify the basic operation of the proposed system. The fabricated multi-turn coaxial winding transformer has been implemented into the system and was tested. The experiment data is compared with the theoretical ones to verify the designs.
15
Huang, Sz-han, and 黃思翰. "Design and Implementation of Half bridge-Full bridge Bidirectional DC/DC Converter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/39124875660773202004.
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碩士國立中正大學
電機工程所
98
This thesis presents design and implementation of an isolated bi-directional DC/DC converter with high voltage input、high conversion ratio and high output power for renewable power system applications. The topology of this circuit is half-bridge switch configuration at the high-voltage side and full-bridge switch configuration on the low-voltage side. In this circuit, the dsPIC chip realizes many functions, such as generation of PWM signals, A/D conversion and circuit protection,etc .When the voltage on the low-voltage side is below the normal range, the circuit is operated in buck mode. On the other hand, when the voltage on the low-voltage side is beyond the normal range, the circuit is operated in boost mode. If it is regulated within the normal range, the circuit is in idle mode. This thesis uses a active clamp snubber circuit to alleviate the voltage spike caused by the current difference between the filter inductor and leakage inductance of the isolation transformer. Finally,a 1 kW isolated bi-directional DC/DC converter has been implemented to verify the feasibility of this circuit.
16
Sae-Foeng, Pitipong, and 馮恩福. "Low Input Current Ripple Phase-Shift Full-Bridge Converter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/77513659879876754803.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
100
The phase-shift full-bridge converter (PSFB) is widely used for the front-end dc-dc converter due to its essential advantages in low voltage and current stresses on the switches, high efficiency and fixed frequency operation. Moreover, it has several features, for instance, the incorporation of the leakage inductance of the transformer to achieve zero-voltage switching (ZVS) of the primary switches and the elimination of the need for the primary side snubbers enables it suitable for high input voltage and high power conversion applications. Several papers have been published to provide the solutions for the main criteria, such as the ZVS range, dead time, and duty cycle loss, in the design trade-off of the PSFB. Inheriting from the characteristic of the Buck converter, however, large di/dt noise is generated due to its pulsating input current waveform. To meet the EMI regulation, therefore, a larger EMI filter has to be added and becomes the only solution so far. To alleviate the input current, di/dt, recently, several input current ripple reduction converters have been proposed in the literature. As a result, the EMI performance can be achieved by using smaller EMI filter components. It reduces the size and saves the cost from the conventional EMI filter design. However, these converters suffer from the high switching loss due to the hard-switching operation. Therefore, zero-voltage switching technique should be applied to enhance their performance. To explore a full-bridge converter with ZVS and reduced input current ripple properties becomes the motivation of this research and a phase-shift full-bridge with input ripple reduction converter (PSFBRR) is proposed. In addition to meet the EMI regulation with smaller filter components, the significant efficiency improvements can be achieved. Including the ZVS range, dead time, and duty cycle loss, the issue of the input current ripple of the proposed PSFBRR is accompanied to be discussed in detail. Moreover, the input current ripple can be further reduced by way of the current ripple cancellation mechanism. Thus, a phase-shift full-bridge converter with input ripple cancellation (PSFBRC) is also proposed to obtain a continuous input current waveform instead of the pulsating shape. To demonstrate its feasibility, the operation principle and the hardware implementations of the proposed converters with 300~380V input and 12V/30A output are described in this thesis.
17
Shiau, Jiau-Cheng, and 蕭教成. "Design and Implementation of an Interleaved Full-bridge Converter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/rkrvxe.
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碩士國立臺灣科技大學
電機工程系
95
An interleaved full-bridge converter with current double rectifier, in which two full-bridge converters are paralleled at output capacitors, is designed in this thesis. The phase shift PWM signals of one full-bridge converter are shifted to another with a fixed angle; as a result, the frequency of the voltage ripple of the output capacitors can be four times of the primary switching frequency. The converter reduces the output voltage ripple due to the cancellation effect. Furthermore, the main output current path is divided by four small current loops. Therefore, the output inductor is easily designed and has smaller chokes so that the size of the DC/DC converter can be reduced significantly. The primary side switches can be operated at a lower switching frequency with zero voltage switching characteristics. The power losses of the proposed interleaved full-bridge converter can be reduced dramatically and thus high power and hign density DC/DC converter can be obtained. Theoretical investigation and detailed design procedures of the converter are provided. Some simulation results are shown to verify the proposed converter. Finally, a 1.2kW interleaved full-bridge converter with 12V and 100A output capability was built to demonstrate the effectiveness of the proposed converter.
18
Lin, Jing-Yao, and 林敬堯. "Battery Charge Management BasedZero-Voltage-Switching Full-bridge Converter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/x4v2wx.
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碩士中原大學
電機工程研究所
102
This thesis studies a charging strategy using phase-shifted full-bridge converter based battery management system (BMS). Battery charging method adopts a constant current and constant voltage charging mode (CC-CV). The battery management system can always monitor the state of charge of the battery immediately, and adjust the phase shift of the gate signal of the converter to maintain a constant output current in the CC mode, and to keep the output voltage constant in CV mode, while the converter can be kept at zero voltage switch (ZVS) to achieve the best efficiency. In this study, a controller UC3875 is employed for the full-bridge phase-shift converter to make gate switching at zero voltage and realize charging mode control. Finally, a 1 kW phase full-bridge converter is implemented to verify the proposed charging strategy; when a set of 48V lead-acid battery with a constant current of 15A charging, the best efficiency can reach 88%.
19
Lin, Shu-Yi, and 林書逸. "Integrated Magnetics Design on Full-Bridge Phase-Shifted Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/4r7f9z.
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碩士國立臺灣科技大學
電子工程系
105
Full-bridge phase-shifted converter sometimes adds external resonant inductor to achieve zero-voltage switching during light load condition. The magnetic components in the circuit include resonant inductor, transformer and output inductor. However, these magnetic components occupy a lot of space in the circuit which cause low power density. The thesis analyzes the integration of magnetic component which integrate these three magnetic components into one core. To derive the flux density and output ripple current, the thesis calculates the DC flux, AC flux and equivalent inductance during operation interval. By adjusting the distance between primary side winding and secondary side winding, the leakage inductor can be used to replace the resonant inductor. Finally, a 500 W full-bridge phase-shifted converter with 380 V input voltage, and 12 V output voltage is implemented by using integrated magnetic technology. Therefore, the resonant inductor, transformer and output inductor can be integrated into one core which can decrease the number of magnetic components in the circuit.
20
Chen, Lian-Shen, and 陳廉燊. "Design and Implementation of Phase-Shift Full-Bridge Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/ec5ss5.
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碩士國立臺北科技大學
電力電子產業研發碩士專班
105
The main theme of this thesis is to design and implement a phase-shift full-bridge converter using UCC3895 as the pulse-phase modulation controller to achieve zero voltage switching. The effective duty is adjusted by shifting the pulse position of this controller. Zero voltage switching is achieved by the external resonant inductor and parasitic capacitor of power devices to reduce the switching losses and thereby increasing the efficiency. The specifications of the designed and implemented converter include, input voltage = 156 V, output voltage = 48 V, output power = 500 W and switching frequency = 100 kHz. Experimental results show the efficiency is up to 88.79% and zero voltage switching is achieved. These results fully support the theoretical analysis and confirm the implementation.
21
Lin, Chuntse, and 林君澤. "Implementation of a Zero-Voltage Full-Bridge Power Converter." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/3hwxy8.
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碩士國立澎湖科技大學
電資研究所
101
This thesis analyzes and designs a zero voltage full-bridge power converter. The circuit model of the zero voltage full-bridge power converter is created by using IsSpice simulation software and then proceeds analyses and simulations according to the circuit model. This thesis utilizes a converter with UCC3895 for pulse-width modulation (PMW) controller according to the designed circuit and realizes the zero voltage full-bridge power converter by using the phase shift of driven signal to change the duty cycle. The experimental results accord with the simulation outcomes.
22
Huang, Kuan-Lung, and 黃冠龍. "Study and Implementation of Full-bridge LCC Resonant Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/59837749148138179977.
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碩士國立臺灣科技大學
電子工程系
103
This thesis developed a specification for the input voltage 380 V, output voltage 12 V, output current 58 A, with synchronous rectification of the full-bridge LCC resonant converter. The primary-side switches possess the turn-on with zero-voltage switching (ZVS) in order to reduce the switching losses. Because of the low output voltage and high output current, the synchronous rectifiers are used instead of the schottky diodes on the secondary side to reduce the conduction losses and improve the overall efficiency. Firstly, the analysis of basic circuit theories for resonant converter is discussed. The operation principles and equivalent circuit of different working intervals are also discussed and derived, respectively. Then, according to the derived transfer function of the resonant tank, a mathematical software Mathcad is used to plot the different parameter curves for quality factor (Q), capacitor ratio (K), on the frequency response of the voltage gain of resonant tank. Finally, a input voltage 380 V, output voltage 12 V, output power 700 W, prototype circuit of an full-bridge LCC resonant converter with synchronous rectification was implemented. Theoretical analyses are verified with the experimental results.
23
Hsu, Tsai-Hua, and 許財華. "Design and Implementation of Full-Bridge LLC Resonant Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/32932884409518751487.
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碩士國立雲林科技大學
電機工程系
104
The main theme of this thesis is to design and implement a full-bridge LLC resonant converter which can be applied to server power supply. LLC resonant converter adopts the full-bridge architecture as the primary side and center tapped rectifier as the secondary side to realize the design considerations of a high efficiency power density. LLC resonant converter has many advantages in switching power converters. It makes full use of junction capacitance, body diode and resonant technologies to achieve zero voltage switching and to reduce switching losses. This thesis also describes the various resonant converters and their operating principles, properties, advantages and disadvantages. Moreover their characteristics of voltage gain and frequency response are simulated and shown by MATHCAD. Finally, this thesis conducted the circuit analysis on the full-bridge LLC resonant power converter. The implemented circuit was characterized by a DC input voltage between 350 and 400V, a DC 12V output voltage, 42A load current, and 504W rated power. Experimental results demonstrated the effectiveness of the proposed converter.
24
Lin, Cyuan-Sin, and 林銓信. "Implementation of High-frequency Phase-shifted Full-bridge Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/82026118793143855058.
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碩士國立臺灣科技大學
電子工程系
105
A phase-shift full bridge converter with zero-voltage-switching (ZVS) features can reduce the switching losses. Thus, the conversion efficiency can be improved and the switching frequency can be raised. Since the studied converter is developed for high switching frequency operation, high-frequency core are used to realize power transformer, resonant and output inductors to prevent saturation. On the secondary side, Silicon Carbide (SiC) diodes are used to replace the conventional fast-recovery diodes for reduction of switching losses. In addition, the effects of the primary-side clamping diodes are analyzed and described. The operating principles and design considerations of the proposed converter are discussed in detail. A prototype phase-shifted full-bridge converter has been implemented and tested under input voltage of 285V, output voltage of 24V and output current of 8.5A. Theoretical analyses are verified with the experimental results.
25
Wang, Wei-Chian, and 王瑋謙. "Asymmetrical Full-Bridge Converter with Input Current Ripple Reduction." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/69576438537495998729.
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碩士國立臺灣科技大學
電機工程系
101
The phase-shift full-bridge converter (PSFB) is widely used in medium-to-high power applications due to its several advantages, such as low voltage and current stress on switches and high conversion efficiency. However, the PSFB still has a large pulsating input current ripple which is a common characteristic of the buck-derived converters. Consequently, a large input filter has to be used to meet the EMI regulation. It limits the power density performance. To reduce the input current ripple, a phase-shift full-bridge converter with input current ripple reduction (PSFB-RR) has been proposed. However, the circulating time interval causes a large circulating loss. To explore a ZVS full-bridge converter with input current ripple reduction without circulating loss becomes the motivation of this thesis and an asymmetrical full-bridge with input current ripple reduction (AFB-RR) converter is thus proposed. However, the AFB-RR has the conventional asymmetrical control has a DC-bias current on power transformer. To eliminate the DC-bias current, another asymmetrical control is employed and the non DC-bias asymmetrical full-bridge converter (NAFB-RR) is also proposed in this thesis. Besides, the operation principle and circuit analysis, several prototypes with 300-400 V input voltage and 48 V/750 W output are implemented and tested to demonstrate their feasibility.
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Lusney, John Travis. "Novel Digital Controller for Multi Full-Bridge DC/DC Converter." Thesis, 2007. http://hdl.handle.net/1974/716.
Full textAbstract:
Distributed generation that utilizes 5-10kW Solid Oxide Fuel Cells requires power electronics to optimize the overall system efficiency while reducing the cost. The Adaptive Energy Zero-Voltage-Switching Phase-Shift-Modulated Full-Bridge (AE-ZVS-PSM-FB) topology meets these criteria under all loading conditions, but suffers from complexity associated with an analog control implementation. This thesis presents a novel Look-Up-Table (LUT) based digital controller required for such converter. The applied design approach also reduces the design time and controller requirements, which in turn decreases the overall system cost.
Steady-state analysis for the AE-ZVS-PSM-FB converter is performed using a piece-wise equivalent circuit model. This analysis is used to verify the LUT concept that forms the basis for the proposed LUT-based digital controller. The proposed LUT-based digital control algorithm is developed and verified using Field Programmable Gate Array (FPGA) Logic platform. Design procedures and operational function under steady state and step change conditions are presented.
Simulation results demonstrate the LUT concept in the AE-ZVS-PSM-FB converter, and the simplicity of the proposed LUT-based digital controller in producing the expected switching sequence. Simulation results were also produced showing successful dynamic response of LUT-based digital controller interconnected with the converter under different operating conditions. A Xilinx FPGA demonstration board was used to generate experimental switching sequence results to demonstrate the simplicity of the proposed controller.Thesis (Master, Electrical & Computer Engineering) -- Queen's University, 2007-09-25 10:26:39.909
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Huang, Ci-Syuan, and 黃啟軒. "Li-ion Battery Charger Applying Phase-Shift Full Bridge Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/99657789659273502179.
Full textAbstract:
碩士國立東華大學
電機工程學系
96
In recent years, due to the gradually exhausted fossil fuel and the serious side-effect of greenhouse effect, energy-saving and carbon-reduction becomes a popular slogan for both government and citizens. In Taiwan, because of the well-development of highway construction and high road-vehicle density, on-road vehicles should be one of the blames for energy consumption and air pollution. To solve this problem, hybrid electric vehicle (HEV) is proposed to promote the energy efficiency and reduce the exhaust emission. As HEV is commercialized, plug-in hybrid electric vehicle (PHEV) becomes the novel research orientation. PHEV is expected to further reduce the oil consumption. Rechargeable (or secondary) battery is one of the crucial components of electric vehicles. Among varieties of rechargeable batteries, lithium-ion (Li-ion) batteries have the highest energy density. In order to trim the weight of electric vehicles, Li-ion batteries are the prominent power source candidates for the next-generation HEV. This thesis is to design and implement an on-board Li-ion battery charger for PHEV. Phase-shift full-bridge converter is adopted as the power stage of the charger to provide higher output power and higher conversion efficiency. Circuit is controlled by the TMS320F2812 digital signal processor chip that is manufactured by TI. Controller is responsible for steering the circuit to fulfill constant-current constant-voltage (CC-CV) charging profile, accompanied by the overcharging protection mechanism of Li-ion batteries.
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Chang, Jie_Kuan, and 張介寬. "Implementation of Phase-Shift Full-Bridge DC/DC Power Converter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/26139847877372803567.
Full textAbstract:
碩士國立高雄應用科技大學
電機工程系
98
In this paper, a non-isolated gate driver circuit is developed for driving the power electronic switches of the diode-clamped three-level power converter, and a phase-shift full-bridge DC/DC power converter is also developed. The developed non-isolated gate driver circuit is composed of the bootstrap-type charge pump circuit and discrete electronic devices. A voltage source using bootstrap charge pump circuit is used to generate four isolated power supplies and four pulse-width modulation signals using a constant current couple mode are used for shifting the signal level. Four different levels of independent power supplies and PWM signals are used to control power electronic switches. A prototype developed by discrete devices is built for verifying the performance of the developed non-isolated gate driver circuit. The experimental results show the feasibility of the developed non-isolated gate driver circuit. This paper will developed a phase-shifted full-bridge DC/DC power converter. The power switch can be controlled by the phase shift control method and using the leakage inductance of transformer to achieve zero voltage switch characteristics to reduce the switching losses. Therefore, the efficiency of DC/DC power converter can be improved. This will be the development phase-shifted full-bridge DC/DC power converter prototype hardware. Experimental results verify the phase-shifted full-bridge DC / DC power converter has the desired function.
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Chen, Chien-Fu, and 陳建甫. "Current Sensorless Control for Dull-Boost Full-Bridge PFC Converter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/91441909262626679231.
Full textAbstract:
碩士國立交通大學
電機學院電機與控制學程
102
This thesis presents the improvement of Full-bridge power factor corrector (PFC) converter to implement the sensorless control method. The circuit topology is different from series switching components of tranditional Full-bridge converter. And there is not the shot-through problem. The freewheeling current flow through the independent diode instead of the body diodes of the switches, then the diodes can be designed otimally. In aspect of controlling method, the sensorless control only has two voltage loop which simplies the control structure and reduce the number of sensors. Siumlation results showes the power factor and current harmonics both in specification. Finally, the implement results are provid to verify the high power factor and improvement current harmonics.
30
Yang, Hsiang-Yu, and 楊翔宇. "Design and Implementation for Full-Bridge Converter and Coaxial Transformer." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/44377209127939032206.
Full textAbstract:
碩士國立清華大學
電機工程學系
94
High power isolated DC/DC converters have been extensively used in various applications, such as telecommunication power supplies, server power supplies, and so on. Significant research efforts have been devoted to increase the operating efficiency and power density of the converter.Soft switching full bridge converter has been proposed to meet these goals by establishing zero voltage switching condition across the power transistors. However, a significant inductor is required to facilitate the resonance condition,and results in increased loss and reduced power density of the converter. In this thesis, a full bridge converter with limited soft switching capability and a coaxially-wound transformer are presented to improve the power density. With the coaxial winding structure, the coupling coefficient the transformer will be much higher than conventional transformer, and the resulting small leakage inductance enables hard-switching of the slave leg of the converter with little switching loss. The duty cycle loss of the converter is also reduced thanks to the low leakage inductance of the coaxial transformer. The transformer loss estimation and design are also taken into consideration.The advantages of FBSSS converter are simply circuit and wild ZVS range. Various coaxial structures are presented in the thesis. Detailed simulations using ANSOFT are conducted to observe their magnetic characteristics. These coaxial transformers are constructed in the laboratory and tested with the full bridge converter under soft-switching conditions to evaluate the performance of the entire system.
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Lin, Wang-Che, and 林汪哲. "Design of Full-Bridge Phase-Shifted Converter with Integrated Magnetics." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/78w747.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
105
In order to reduce the line power dissipation and wire stress, by adopted full-bridge phase-shifted converter with current doubler as rectification circuit in secondary side when converter’s output in a low voltage and high current condition. Compared with the conventional center-tap rectification circuit, the current doubler has more magnetics. This thesis proposes a new kind of current doubler structure with integrated magnetics to decrease the number of magnetics and prevent from the large leakage inductor which may cause large duty cycle loss. The proposed structure solves the problem of the large leakage inductance by changing winding method. The new structure also has the coupling inductor to reduce output current ripple, which has the same current rectification result compare to the conventional current doubler.
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Chen, Li-Yi, and 陳利溢. "Design and Implementation of Bidirectional Full Bridge CLLC Resonant Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/646k89.
Full textAbstract:
碩士國立臺北科技大學
電機工程系電力電子產業碩士專班
106
The objective of this thesis is to design and implement a CLLC resonant converter with bidirectional power flow control. Both the high voltage side and low voltage side can achieve soft switching and thereby reducing switching losses. The output voltage is regulated by varying switching frequency. The digital signal processor, TMS320F28335, is used as control platform for the verification of design and implementation. The design specifications include: high voltage side voltage 400 V dc link and load voltage side voltage 48 V, total power rating of 720 W. For the buck mode , switching frequency from 100 kHz~97 kHz. And the maximum efficiency is up to 91.6%, zero voltage switching for high voltage side device and zero current switching can be for load voltage side diode achieved. For the boost mode , switching frequency varieties from 103 kHz~122 kHz. The maximum efficiency is up to 93% and, zero voltage switching for the low voltage side device can be achieved.
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Chang, Chen-Tung, and 張鎮東. "Design and Implementation of Phase-Shift Full-Bridge DC Converter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/u2awuz.
Full textAbstract:
碩士國立臺北科技大學
電力電子產業研發碩士專班
95
The objective of this thesis is to investigate the effect of resonant inductor on the performance of phase-shift full-bridge DC converter. It shows that the inductance value will affect the resonance as well as the zero-voltage-switching turn-on feature. To achieve zero-voltage-switching, the inductance value is related to the parasitic capacitance of power device and the square of input voltage. A phase-shift full-bridge DC converter has been designed and implemented. The specifications of this converter as following: input voltage = 156 V/DC, output voltage = 48 V/DC and output power = 0.5 kW. The experimental results show that the maximum efficiency is 89.38% and the efficiency at full load is 87.71%. This result proves the theoretical analysis.
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CHIANG, MING-CHUN, and 江明駿. "Design and Implementation of a Single-Stage Full-Bridge Converter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/gze45y.
Full textAbstract:
碩士國立臺北科技大學
電機工程系電力電子產業碩士專班
108
The purpose of this thesis is to design and implement a single-stage full-bridge converter. The system uses a full-bridge converter as the main architecture, combined with a dual power factor correction inductor and interleaved technology, so that the converter has excellent power factor correction capability. In addition, all switches have zero voltage conduction characteristics and the reverse recovery current of the power diode can be improved. Therefore, the switching losses and reverse recovery losses can be reduced, that is system efficiency can be higher. This thesis uses voltage loop control for output stable regulation also can be achieved. In this thesis, the microcontroller TMS320D28035 produced by Texas Instruments is used as the control core to realize the designed controller and voltage loop control method to verify the correctness and feasibility of the implemented single-stage full-bridge converter and the associated design analysis. The experimental results include input voltage AC 110V,output voltage DC48V and maximum output power500W. The experimental results show that the harmonic current meets IEC61000-3-2 Class D standard, the power factor can reach 0.98 under full load condition, and maximum efficiency is 91.24%.
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Yang, Yu-Chang, and 楊育璋. "Three-Port Isolated Full-Bridge Bidirectional DC-to-DC Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/41849037729000621373.
Full textAbstract:
碩士南臺科技大學
電機工程系
105
The three-port isolated full-bridge bidirectional DC-to-DC converter has three different energy ports, with flexible power transmission, electrical isolation and high power density. So this converter is suitable for micro-grid and renewable energy systems to connect different energy and load. This paper proposes a Three-port isolated full-bridge bidirectional DC-to-DC converter to integrate renewable energy, energy storage systems and supply energy to the load, which can greatly reduce the impact of intermittent effects by integrating renewable energy and energy storage systems. It can also improve the reliability and utilization of the entire system. In addition, the integration of energy storage systems into renewable energy can solve the problem of slow response due to renewable energy, and can provide additional energy required for the load or absorb energy, thus greatly improving the overall system dynamics. Finally, the experimental results of the total power 500W of the three-port isolated full-bridge bidirectional DC-to-DC converter show that the proposed converter is feasible in practical application.
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Ismail, Nasser. "A single stage full bridge power factor corrected AC/DC converter." Thesis, 1996. http://spectrum.library.concordia.ca/193/1/MQ26004.pdf.
Full textAbstract:
Conventional single phase AC/DC converters use a two stage power configuration to provide a regulated DC power supply at high input power factor. Elimination of one of these stages can reduce the cost, weight, size, complexity and increase the overall reliability of this converter. This thesis proposes a single stage power factor correction converter circuit. This proposed converter circuit uses the traditional non-power-factor corrected circuit configuration with only few additional components. These are: an additional winding on the high frequency transformer, a small high frequency inductor and three diodes. The topology allows the output voltage regulation and input current shaping with a single power processing stage and one control chip. In addition, it is shown that this converter can be designed to offer soft switching of the full bridge switches. The operating principles of the proposed converter are discussed and its performance characteristics under steady state conditions are examined. A design procedure is illustrated to select the components of the converter for a 500 W power supply operating at 50 kHz. Theoretical results are verified with simulation and experimental tests on a 500 W laboratory prototype.
37
Chiao-WenLin and 林巧? "Full-Bridge LLC DC-DC Resonant Converter with PLL Control Scheme." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/88064295907720661120.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
98
This thesis presents a full-bridge LLC DC-DC resonant converter with phase-locked-loop control (PLL) scheme, which is able to track the resonant frequency of the LLC resonant tank as the reference frequency point for the control of the frequency-modulation. Since the resonant frequencies of the LLC resonant tank are dependent on the load conditions and component deviations, unlike conventional frequency-modulation control, PLL control is utilized to ensure that the operating frequency keeps in the zero-voltage-switching (ZVS) region for obtaining low switching loss. Furthermore, in order to fulfill in high-power applications, the full-bridge converter is required instead of half-bridge circuit in this thesis. Moreover, in order to have high efficiency within wide input voltage range, high power factor for the LLC resonant tank should be ensured. The parameters of the LLC resonant tank are designed according to the voltage gain and input-power factor of the LLC resonant tank. Finally, the prototype circuit of the full-bridge LLC resonant converter, with 48V output voltage at 12A output current, is built to verify the performance of this proposed full-bridge LLC DC-DC resonant converter with PLL control.
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Chen, Yi, and 陳毅. "A Novel Bi-directional ZVS-ZCS Full-Bridge DC/DC Converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/28653472294022308403.
Full textAbstract:
碩士南台科技大學
電機工程系
97
A novel bi-directional zero-voltage-switching (ZVS) and zero-current-switching (ZCS) full-bridge dc/dc converter is proposed in thesis. The proposed full-bridge converter topology with low ripple input current, which converts the energy from battery to DC bus (or load) and visa versa. In order to improve the overall efficiency, the proposed bi-directional converter uses the leakage inductance of the transformer and a capacitor to achieve circuit resonance. The resonant frequency is operated in about double frequencies of the primary switch. In this topology, both of the primary switch and the rectifier diode are operated in ZCS when it is being turned-on and turned-off. To verify the feasibility of the prototype bi-directional ZVS and ZCS full-bridge dc/dc converter, a 250 W output power charge mode (buck mode) and a 250 W output power discharge mode (boost mode) will be discussed in thesis.
39
Chen, Jun-Han, and 陳俊翰. "Zero Voltage Switching Full-Bridge Converter with Two Different Control Schemes." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/mj3jz3.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
103
A conventional full-bridge converter has been widely used in high input-voltage, high-power applications. Several control schemes have been applied to full-bridge converter, such as symmetrical control, phase shift control, duty cycle control, and asymmetrical control. Among these, duty cycle control and asymmetrical control have been seldom discussed and will be investigated in this thesis. Employing symmetrical control, full bridge has been used for a long time. It suffers from large switching losses due to its hard-switching operation. It will impact the conversion efficiency and limit power density. To improve the efficiency, phase shift full-bridge converter (PSFB) was successfully proposed instead in the last three decades. Because it can achieve ZVS operation, the switching turn-on losses are significantly reduced. To further improve efficiency, the conduction losses of the rectifier diode can be decreased by employing synchronized rectifier technique. However, two additional driver signals are not available in the popularly used phase shift controllers, such as UC3875 and UC3895. As an alternative control scheme, full-bridge converter with duty cycle control (FBDC) is investigated. In addition to inheriting the advantages and the disadvantages of PSFB, FBDC can directly provide synchronous rectification driver signals if higher efficiency and simple controller design are demanded. However, a circulation loss problem occurs in FBDC as well as in PSFB. Accordingly, a full-bridge converter with asymmetrical control is thus examined. In addition to the descriptions of the operation principle and design consideration, two hardware circuits, FBDC and AFB, with same 300-400-V input and 12-V/ 360W output specifications were built and compared.
40
Lin, Lin-Yen, and 林彥霖. "Input Current Ripple Reduction Asymmetrical Full Bridge Converter with Digital Control." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/4j4yw2.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
104
DC-DC converters with a high efficiency and high power density are currently in high demand. Full-bridge converters (FB) exhibit high efficiency owing to their low voltage and current stress, making them suitable for high-input-voltage and high-power-conversion applications. Employing conventional symmetrical control schemes, however, FB converters have large switching losses because of their variable dead-time. Therefore, their power densities are limited. Accordingly, fixed dead-time controllers such as phase-shift controllers are widely used for FB converters. Inheriting the characteristics of a Buck converter, a conventional phase-shift controller has large di/dt noise that is generated by the pulsating input current waveform. As a result, a larger electromagnetic interference (EMI) filter must be added, which is the only proposed solution so far. To reduce the input current ripple of a phase-shift full-bridge converter (PSFB) with ZVS, the proposed input current ripple reduction PSFB converter. Moreover, there is circulation loss with phase-shift control, which increases the conduction loss and limits the efficiency performance. To alleviate this problem, an asymmetrical control was selected which also provides a fixed dead-time so that ZVS operation can be achieved Therefore, an asymmetrical full bridge converter (AFB) with ZVS operation and low input current ripple are requested, which has not been explored yet. It becomes the motivation of this research and an Input Current Ripple Reduction Asymmetrical Full Bridge converter (RR-AFB) is thus proposed. To achieve ZVS for all load ranges using RR-AFB converter, the dead-time needs to vary with different loads. Operation using an analog controller cannot accomplish this, whereas digital controllers can. The design and implementations of a digital controller for the DC-DC converters were achieved by using digital signal processors (DSP). To demonstrate the feasibility of the converter, the operational principle was experimentally tested, and circuit analysis was performed on the proposed converters at an operating frequency of 100 kHz, an input voltage range of 300-400V, and an output power of 24V/1.5-15A.
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Chen, Shau-Wei, and 陳劭瑋. "Efficiency improvement of full-bridge resonsnt converter under light load condition." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/8p6478.
Full textAbstract:
碩士國立臺北科技大學
電機工程系所
103
The main theme of this thesis is to design and implement an LLC resonant converter controlled by a digital signal processor. The output voltage is regulated by the variable switching frequency. The resonant inductor, resonant capacitor and magnetizing inductor are used to achieve zero voltage switching and reduce switching loss. In addition, synchronous rectifier for LLC converter is used to reduce conduction loss in secondary side and improve efficiency. A hybrid control strategy is proposed to well regulate the output voltage and reduce the switching loss under light load condition. The circuit parameter is designed with the large magnetizing inductance to decrease the primary side current. The entire system has better performance than that for conventional control method. The signal processor, TMS320F28035, is used as the control platform for the verification of design and implementation. The specifications include input voltage 400V, output voltage 12V, total power rating 720W and switching frequency varying from 60 kHz to 130 kHz. Simulation and experimental results show that the maximum efficiency improvement is up to 2% using the hybrid PWM control technique. These results confirm the design and implementation.
42
Lin, Yu-Hsuan, and 林玉軒. "Design and Implementation of a Paralleled Phase-Shift Full-Bridge Converter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/8387hy.
Full textAbstract:
碩士國立臺北科技大學
電力電子產業研發碩士專班
96
The thesis adopts full-bridge phase-shifted zero-voltage isolated switching converter as the basic structure. First, the hardware of proposed converter is established using a phase-shift current controller UCC3895 manufactured by Texas Instruments (TI). In order to control output voltage of converter, the UCC3895 is in charge of current control, phase-shift and PWM generation. Then the zero voltage switching (ZVS) is yielded by parasitic capacitance of MOSFETs and a leakage inductance of transformer to reduce the switching losses of MOSFETs. Finally, a paralleled operation of two UCC3895-based phased-shifted converter is devised to improve the current sharing behavior in steady-state. And the clock inputs of the paralleled converter are provided by a pair of synchronous interleaved clocks to let the converter possess lower output voltage ripple
43
Siao, Ren-Yuan, and 蕭壬遠. "Study and Implementation of Full-bridge Zero-Voltage-Switching Buck Converter." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/22035309583708285003.
Full textAbstract:
碩士南台科技大學
電機工程系
94
This thesis presents a full-bridge phase-shift zero-voltage-switching converter. Its advantages include low switching loss, low switching stresses, low EMI, etc.. An additional boost-type power factor corrected (PFC) is cascaded in the front to improve the input power factor. The zero-voltage-switching converter uses UC3895 to take as PWM controller. It adopts the phase-shift control algorithm for drive signal to change duty cycle in order to handle the load variation. The resonant inductor and the MOSFET ‘s parasitic capacitance are used to achieve the zero-voltage-switching effect. The operating theorem of each state in the circuit has been explained. Simulations based on the IsSpice program have also be made in this thesis. Finally, a prototype with 400W rating was built to demonstrate the performance of the proposed techniques.
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Cheng-KunChen and 陳證棍. "Design and Implementation of Full-Bridge Resonant Converter with SiC Devices." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/7xqsxg.
Full textAbstract:
碩士國立成功大學
電機工程學系碩士在職專班
107
An isolated full-bridge resonant converter with digital signal control which is applied for battery charger of electric vehicle is designed and implemented in this thesis, apart from this, this resonant converter could also achieve soft switching to reduce switching losses, eliminate voltage stress across the power switches and further improve the system conversion efficiency. Main topology of proposed circuit is comprised of a full-bridge resonant converter used to raise system power density, and Silicon Carbide-based MOSFETs are applied in this converter for higher frequency applications. First, conventional resonant converters will be introduced. Also, the theoretical operating analysis of the proposed circuit will be discussed in detail, after that, the steady-state voltage-gain curves and characteristics will be derived. Finally, an experimental prototype with input voltage from 380 V to 420 V, rated power 3 kW and output voltage 48 V is designed and implemented, which is controlled by the digital signal processor TMS320F28335 for energy conversion control to validate the theoretical analysis. Finally, the results of experiment reveal that the maximum efficiency is 94.7% at 50% load and the efficiency of full load is 92.5%.
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Huang, Kuan-Pin, and 黃冠斌. "Phase-shifted Full-bridge Converter using Current Doubler for Battery Charging." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/87461939608831600944.
Full textAbstract:
碩士中原大學
電機工程研究所
104
This thesis aims to develop a 1-kW phase-shift full-bridge converter with a toroid-core-wound autotransformer designed current doubler rectifier as a battery charger. Comparing with the use of single inductor rectifier, the valid duty of the converter can be extended because of the smaller transition period. Using constant current mode as our battery charging method, by adjusting the phase shift of the control signal we are able to maintain constant current through the whole charging period. The converter acts close to zero-current switching (ZCS) at light load and keeps the zero-voltage switching (ZVS) at heavy load, which allows the converter work in high efficiency. In this study, the controller UC3875 is employed to provide the phase-shift signals for stabilizing the output current constant. The specification of the converter is 380V input and 48V output. A 1-kW converter is implemented to verify the estimation results. A set of 48V lead-acid battery was charged by the converter with constant current of 20A, and it proves that the efficiencty under 1 kW output power was over 90%.
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Lin, Bin-Hao, and 林稟豪. "Implementation of Wind Turbine Generation System Based on Full-Bridge Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/00488740139683907271.
Full textAbstract:
碩士明志科技大學
電機工程系碩士班
104
A grid-connected wind-turbine generation (WG) system of three-phase 220V/60Hz 2kW is implemented with TI TMS320F28335 DSP in this thesis. This system includes maximum power point tracking (MPPT), software phase locked loop (SPLL) of decoupled double synchronous reference frame (DDSRF), power controller, and islanding detection system. The various maximum output powers of WG corresponds to various wind speeds. The MPPT of dual alternating gain perturb and observe method is used in this thesis, which can quickly track MPPT and stablely output maximum power comparison with the incremental conductance method. The traditional SRF-PLL is replaced by DDSRF-PLL for decreasing the transient response time for detecting the ratio of change of frequency at PCC. The power controller of the system consists of the calculation of the LCL voltage dropping compensation, power curve fitting of three degree in two variable equation, and the calculation of the harmonic compensation for improving the power quality, the accuracy of output power, and the transient response time. The islanding detection technology of passive ROCOF method combined with the active reactive power variation method is used in this study. The used SPLL and power controller in the thesis can reduce the transient response times of islanding detection method, which has been proved in this thesis. In the hardware, the output three-phase voltages of the WG are converted to DC after rectifiing and filter, then the DC voltage magnitude is regulated by the full-bridge converter. The regulated DC voltage is applied to the terminal of three-phase inverter, the inverter outputs the three-phase AC voltage for the grid-connected. The experimental results shows the efficiency of the system about 82.56%, and the islanding detection method in this thesis can accurately detect the islanding event in the NDZ of ROCOF and the tripping time of breaker is in accordance with the criterion of IEEE 1547.
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DU, YAN-KANG, and 杜彥慷. "Implementation of a Modular and Hybrid Phase-Shifted Full-Bridge Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/13039709016315067241.
Full textAbstract:
碩士國立雲林科技大學
電機工程系
104
A modular and hybrid phase-shifted full-bridge converter is proposed in this thesis for high input voltage and high output current applications. The proposed converter adopts three hybrid phase-shifted full-bridge converters connected in series. Each hybrid phase-shifted full-bridge converter consists of a traditional phase-shifted full-bridge converter and a half-bridge LLC resonant converter with sharing power switches of lagging leg, wider operating range of zero-voltage switching (ZVS) and fewer power switch counts. In order to overcome high input voltage application and reduce voltage stress of power switches, the input side of the proposed converter connects three hybrid phase-shifted full-bridge converters with three input capacitors in series, and two flying capacitors are used to make the voltage of three input capacitors automatically balance. Moreover, the output side of the half-bridge LLC resonant converter and the rectifier side of the phase-shifted full-bridge converter are connected in parallel with an auxiliary voltage diode which provides a positive rectified voltage instead of zero voltage on the rectifier side of the phase-shifted full-bridge converter during the circulating phases, then the circulating current loss of the primary side of the traditional phase-shifted full-bridge converter is reduced. Finally, a detailed circuit analysis and the feasibility of the proposed converter are conducted through simulation software, the experiments implement with 750-800 VDC input voltage, 24 VDC output voltage, 75 A output load current and 1.8 kW rated power.
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Wang, Shang-Lun, and 王尚倫. "Analysis, Design and Implementation of an Asymmetric PWM Full-Bridge Converter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/15503806462302012432.
Full textAbstract:
碩士國立雲林科技大學
電機工程系
102
In this thesis, a low-cost and high-power full-bridge converter with asymmetric pulse-width modulation (PWM) is studied and implemented. Traditional phase-shifted PWM full-bridge converter needs phase-shifted PWM IC to generate the proper PWM signals for power switches so that the cost of the total full-bridge converter is expensive. On the other hand, the general purpose PWM ICs have been used in industry for their low cost and easy-control. Thus, the general commercial PWM IC instead of phase-shifted PWM IC is adopted in the proposed circuit. The secondary sides of the proposed converter are connected in parallel in order to share load current for high power applications. Finally, a low-cost and high-power asymmetric PWM full-bridge converter with 370~400Vdc input voltage and 24Vdc/40A output power is implemented to confirm the effectiveness of the proposed converter.
49
Ou, Wei-sheng, and 歐威盛. "Hybrid Zero-Voltage- and Zero-Current-Switching Phase-Shift Full-Bridge Converter." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/85117610964744319402.
Full textAbstract:
碩士國立中山大學
電機工程學系研究所
101
Conventional phase-shift full-bridge converter can achieve Zero-Voltage Switching (ZVS) at power switches by phase shift control of switches’ driving signal. However, the problems such as freewheeling circulating loss, duty cycle loss, parasitic ringing and hard to achieves ZVS in the lagging leg switches at light load still exist in the conventional phase-shift full-bridge converter. Thus the conventional phase-shift full-bridge converter can not be operated efficiently at light load. This thesis implements a hybrid Zero-Voltage and Zero Current Switching (ZVZCS) phase-shift full-bridge converter. An auxiliary resonant circuit is added to the secondary side of the conventional phase-shift full-bridge converter to generate resonant current. Based on the generated resonant current, the ZVS for leading-leg switches and ZCS for lagging-leg switches can be achieved without modifying the original switches’ driving Pulse Width Modulation (PWM) signals. The freewheeling circulating loss, duty cycle loss and parasitic ringing can therefore be reduced. The detailed operation modes and circuit parameters design for the proposed converter are analyzed in this thesis. A circuit prototype for the proposed ZVZCS phase-shift full-bridge converter with rated power 480W is implemented in this thesis. The performances between the conventional phase-shift full-bridge converter and the proposed ZVZCS phase-shift full-bridge converter are also investigated. Experimental results demonstrate the features of the proposed ZVZCS converter.
50
Hong-Ching, Hu, and 胡宏慶. "Study and Implementation of Full-Bridge Phase-Shifted Zero-Voltage-Switching Converter." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/19365165856211500637.
Full textAbstract:
碩士國立成功大學
電機工程學系
88
The power density of the traditional switching power supply is limited by the switching frequency, since high switching frequency are accompanied by high switching losses and serious electromagnetic interference. These defects can be improved by soft switching technique. This thesis uses the phase-shifted PWM controller IC and utilizes MOSFET junction capacitance and additional inductance to achieve zero-voltage resonant switching. Finally, a 400W experimental prototype is constructed to verify the theoretic analysis and the feasibility of zero-voltage-switching technique.