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1
Chen, Haoning (William). "LLC Resonant Current Doubler Converter." Thesis, University of Canterbury. Electrical and Computer Engineering, 2013. http://hdl.handle.net/10092/8492.
Full textAbstract:
The telecommunications market is one of the large rapidly growing fields in today’s power supply industry due to the increasing demand for telecom distributed power supply (DPS) systems. The half-bridge LLC (Inductor-Inductor-Capacitor) resonant converter is currently the most attractive topology for the design and implementation of 24V/48V DC telecom power converters. The current doubler rectifier (CDR) converter topology was invented and described in the early 1950s which can offer the unique characteristic of halving the output voltage while doubling the output current compared to a standard rectifier. In this thesis, the current doubler converter topology with its unique characteristic is evaluated as a complementary solution to improve the LLC resonant converter performance, especially for the low output voltage and high output current telecommunication applications. A novel half-bridge LLC resonant current doubler converter (LLC-CDR) is proposed in this thesis which can offer several performance benefits compared to conventional LLC-standard rectifier design . The unique characteristics of the LLC-CDR topology can offer significant improvements by transformation of a 48V converter into a 24V converter with the same power density. This thesis introduces a new SPICE-based simulation model to analyse the operation of this novel LLC-CDR converter circuit design. This model can be used to define the critical component parameters for the LLC -CDR circuit output inductor values. It can also be used to predict the circuit overall performance under different load conditions. Both time-domain based transient simulation analysis and frequency-domain based AC analysis provided by this simulation model showed favourable results in comparison to bench measurement results on a prototype. The model
provides a valuable insight to reveal some of the unique characteristics of this LLC -CDR topology. It demonstrates a proof of concept that the conventional LLC resonant
converter can be easily redesigned for low voltage, high current applications by using the LLC-CDR topology without requiring a new design for the LLC resonant stage components and the power transformer. A new magnetic integration solution was proposed to significantly improve the overall performance in the LLC-CDR topology that had not been published before. The LLC-CDR converter hardware prototypes with two output inductors coupled and uncoupled configurations were extensively modelled, constructed and bench tested.Test results demonstrated the suitability of an integrated coupled inductors design for the novel LLC-CDR converter application. The integrated coupled inductors design can significantly improve the LLC-CDR converter frequency-domain based AC simulation analysis results. In addition, these results also illustrate the potential benefit of how the magnetic integration design in general could reduce the magnetic component size, cost, and weight compared to the uncoupled inductors design. Finally, a hardware prototype circuit was constructed based on a commercial 1800 W single phase telecom power converter to verify the operation of this novel half bridge LLC-CDR topology. The converter prototype successfully operated at both no load and full load conditions with the nominal output voltage halved from 48VDC to 24VDC, and doubled the output current to match the same output power density. It also demonstrates that the efficiency of this novel half bridge LLC –CDR is 92% compares to 90% of EATON’s commercial 24VDC LLC resonant converter, which can fulfill the research goals.
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
Kehler, Leandro Becker. "Projeto e desenvolvimento de fontes auxiliares para transformadores de estado sólido." Universidade Federal de Santa Maria, 2015. http://repositorio.ufsm.br/handle/1/8578.
Full textAbstract:
This master thesis presents the development of an auxiliary power supply to provide energy to sensors, gate drivers, instrumentation circuits and control of a three-stage Solid State Transformer (SST). These devices require an insulated power supply of ±15V and 5V. For reason of reliability and modularity, a distributed auxiliary source is proposed. Thus, it is necessary a power supply to provide energy to the low voltage (LV) side and another to the medium voltage (MV) side. With this proposal, the auxiliary power supply does not need to have the same galvanic insulation of the SST, 25kV. However, a local power supply must operate at high voltage levels and, consequently, contain a high step-down voltage gain. Relative to LV side, the most generally used topologies as an auxiliary power supply are discussed. However, these topologies cannot be used at the MV converters, due to the high voltage stress levels involved. A study of topologies used on medium and high voltage and which enable to reach a high step-down voltage gain is realized, and two interesting topologies for this application were found. One of them uses a Flying capacitor converter connected in cascade with a Double-Ended Flyback converter. The Flying capacitor converter lowers the DC bus voltage in a controlled manner to low voltage levels. So the Double-ended Flyback converter operates in LV and provides the insulated outputs to command circuits of SST. The other topology is a unidirectional four-level NPC converter operating as Double-ended Flyback converter. For this case, a modulation strategy that allows the converter to reach a high step-down voltage gain was also proposed. These topologies were evaluated and the one which showed the best result was the four-level Double-ended Flyback converter. This converter was implemented and the experimental results prove to be effective. For the LV side, a Half-bridge LLC resonant converter as auxiliary power supply was used. This converter operates in ZVS and performs the output voltage regulation through the operating frequency variation. The experimental results of this converter are also presented.Este trabalho de mestrado apresenta o desenvolvimento de fontes auxiliares para alimentar sensores, circuitos de comando, instrumentação e o controle de um Transformador de Estado Sólido (SST) de três estágios. Estes dispositivos necessitam de alimentação isolada com tensões de ±15V e 5V e por questões de confiabilidade e modularidade, propõe-se a utilização de fontes auxiliares distribuídas. Assim, emprega-se uma fonte auxiliar para alimentar o lado de média tensão (MT) e outra para alimentar o lado de baixa tensão (BT). Com essa proposta, as fontes auxiliares não necessitam ter a mesma isolação galvânica do SST, 25kV. Entretanto, uma das fontes locais deve operar em níveis de tensão elevados e, por consequência, apresentar baixo ganho estático. No lado de BT, as principais topologias normalmente utilizadas como fonte auxiliar são discutidas. No entanto, devido aos altos níveis de tensão envolvidos, estas topologias não podem ser aplicadas ao conversor que opera em MT. Um estudo sobre topologias aplicadas a média tensão e que possibilitam alcançar um baixo ganho estático é realizado, sendo que duas topologias se mostram interessantes para esta aplicação. Uma consiste na utilização de um conversor de capacitores flutuantes conectado em cascata com um conversor Double-Ended Flyback. O conversor de capacitores flutuantes rebaixa a tensão do barramento CC, de forma controlada, para baixa tensão. Assim o Double-Ended Flyback opera em BT e fornece as saídas isoladas para alimentar os circuitos de comando do SST. A outra topologia trata-se de um conversor NPC de quatro níveis unidirecional operando como conversor Double-Ended Flyback. Para este caso, também foi proposta uma estratégia de modulação que permite o conversor alcançar o baixo ganho estático. Essas topologias foram avaliadas, apresentando melhor resultado a esta aplicação o conversor Double-ended Flyback de quatro níveis, conforme será demonstrado neste trabalho. Esse conversor foi implementado e os resultados experimentais comprovam o seu funcionamento. Para a fonte do lado de BT utilizou-se um conversor Half-Bridge LLC ressonante que opera em ZVS e realiza a regulação da tensão de saída pela variação da frequência de operação. Os resultados experimentais deste conversor também são apresentados.
4
Wan, Hongmei. "High Efficiency DC-DC Converter for EV Battery Charger Using Hybrid Resonant and PWM Technique." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/32343.
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The battery charger plays an important role in the development of electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs).This thesis focuses on the DC-DC converter for high voltage battery charger and is divided into four chapters. The background related to EV battery charger is introduced, and the topologies of isolated DC-DC converter possibly applied in battery charge are sketched in Chapter 1. Since the EV battery charger is high voltage high power, the phase-shifted full bridge and LLC converters, which are popularly used in high power applications, are discussed in detail in Chapter 2. They are generally considered as high efficiency, high power density and high reliability, but their prominent features are also limited in certain range of operation. To make full use of the advantages and to avoid the limitation of the phase-shifted full bridge and LLC converters, a novel hybrid resonant and PWM converter combining resonant LLC half-bridge and phase shifted full-bridge topology is proposed and is described in Chapter 3. The converter achieves high efficiency and true soft switching for the entire operation range, which is very important for high voltage EV battery charger application. A 3.4 kW hardware prototype has been designed, implemented and tested to verify that the proposed hybrid converter truly avoids the disadvantages of LLC and phase-shifted full bridge converters while maintaining their advantages. In this proposed hybrid converter, the utilization efficiency of the auxiliary transformer is not that ideal. When the duty cycle is large, LLC converter charges one of the capacitors but the energy stored in the capacitor has no chance to be transferred to the output, resulting in the low utilization efficiency of the auxiliary transformer. To utilize the auxiliary transformer fully while keeping all the prominent features of the previous hybrid converter in Chapter 3, an improved hybrid resonant and PWM converter is proposed in Chapter 4. The idea has been verified with simulations. The last chapter is the conclusion which summaries the key features and findings of the two proposed hybrid converters.Master of Science
5
Gil, Gloria Milena Vargas. "Controle e simulação de um sistema fotovoltaico de baixa potência conectado à rede elétrica." reponame:Repositório Institucional da UFABC, 2016.
Find full textAbstract:
Orientador: Dr. José L. Azcue PumaDissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Engenharia Elétrica, 2016.
Este trabalho apresenta o estudo, modelagem e projeto de um sistema de conversão de energia para a conexão de um módulo fotovoltaico com a rede elétrica. Nesta pesquisa são abordados três conversores para adequar a energia gerada por um painel fotovoltaico e conectá-la à rede elétrica. O primeiro conversor é um Boost intercalado de dois níveis encarregado de implementar o MPPT (Maximum Power Point Tracking), o segundo conversor é um Ressonante LLC que realiza o isolamento galvânico e o terceiro conversor é um inversor em ponte completa que mantém a tensão de barramento em um valor determinado e realiza a conversão de corrente contínua para corrente alternada. Os três conversores são projetados, calculando os elementos passivos que os compõem e simulando os circuitos obtidos. Também, é realizada a modelagem dos conversores e o projeto dos controladores utilizando a análise de pequenos sinais. Os resultados de simulação são apresentados utilizando os softwares PSIM e MATLAB. Na parte experimental são verificados os dois primeiros conversores usando o kit High Voltage Isolated Solar MPPT fabricado pela Texas Instruments.
This work presents the study, modeling and design of a photovoltaic conversion system for the connection of a photovoltaic module with the grid. In this research three converters are approached to adequate the generated energy for a photovoltaic panel and to transfer the energy to the grid. The first converter is an interleaved two-level boost responsible for implementing the MPPT (Maximum Power Point Tracking) the second converter is a Resonant LLC that performs galvanic isolation and the third converter is a complete bridge inverter that keeps the bus voltage at a certain value and performs the conversion of continuos current to alternating current. The three converters are designed, calculating the passive elements that compose them and simulating the obtained circuits. Also, the modeling of the inverters and the design of the controllers are performed using small signal analysis. Simulation results are presented using the PSIM and MATLAB software. In the experimental part the first two inverters are verified using the High Voltage Isolated Solar MPPT kit manufactured by Texas Instruments.
6
Yung-Chyang-Wang and 王永強. "LLC Resonant Half Bridge Converter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/65223932741609639976.
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Chen, Nan-Chung, and 陳南仲. "Analysis and Implementation of Half-Bridge LLC Resonant Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/m47vep.
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FANG, YU-XIANG, and 方昱翔. "Applying Half-Bridge LLC Resonant Converter to LED Driving." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3u45vm.
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碩士國立臺北科技大學
電機工程系
107
A two-channel LED driver based on a half-bridge LLC resonant converter with a current-sharing capacitor is presented herein. For the proposed LED driver, the half-bridge LLC resonant converter is used to provide LED strings with galvanic isolation and stable current. At the same time, main switches have zero voltage switching so as to decrease switching loss. Furthenmore, the current-sharing capacitor is connected to the center-tapped point of the secondary winding so as to balance the currents in two LED strings. Above all, the proposed circuit has extensibility. In this paper, the operating principles of such an LED driver are firstly described and analyzed. After this, the simulated results based on PSIM software are provided so as to verify the feasibility of this LED driver. Eventually, a digital signal processor, named UCD3138, is used as a circuit control kernel, and the corresponding experimental results are offered to demonstrate the effectiveness of this LED driver.
9
Yueh, Hsuan-Yu, and 岳軒宇. "Step-gap Transformer for LLC Half-bridge Resonant Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/494zgq.
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碩士國立臺灣科技大學
電子工程系
106
A current-controlled variable transformer’s magnetizing inductance strategy, for further improving the hold-up time on half-bridge LLC converter, is proposed. A simple control strategy is used to set the desired inductance value when the input power is cut-off, In detail, the transformer’s magnetizing inductance decrease sharply when the input power is cut-off, therefore, the converter’s hold-up time can be improved without using additional auxiliary circuit or modulation control method. The mathematic model between magnetizing inductance and step-gap of LLC transformer is proposed, the benefit effects using this control strategy are verified theoretically. In the end, two platforms of LLC resonant converter are built. The experimental results have verified the hold-up time improvement of LLC resonant converter utilizing step-gap transformer.
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Yong-HongHuang and 黃永宏. "Analysis and Implementation of Half-bridge Resonant Capacitance LLC converter." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/05324576081032013613.
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碩士國立成功大學
電機工程學系碩博士班
101
In this thesis, a half-bridge resonant capacitance switching network LLC converter is analyzed and implemented. The half-bridge resonant capacitors switching network is adopted to reduce the input current ripple. The resonant capacitors and the input capacitors are integrated so that the components can be reduced. Two transformers are connected in series on the primary side and in parallel on the secondary side, thus the voltage stress and current stress is reduced. Since the voltage and current are automatically balanced between two transformers so that their power capacity is balanced. The operating principle is analyzed, the equivalent circuit of the resonant tank is analyzed, and some important parameters are designed. Finally, a LLC half-bridge resonant converter with 400V input voltage, 24V/600W output is implemented to verify the feasibility and effectiveness of the proposed LLC converter.
11
Su, Ying-Jie, and 蘇英傑. "1 MHz LLC Half-Bridge Series Resonant DC-DC Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/28nrqb.
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碩士國立臺灣科技大學
電子工程系
105
Gallium-nitride high-electron-mobility transistors (GaN HEMT) have been prosperously developed these years. Besides their stability, they are also widely used in various applications. According to the structure, it can be divided into enhancement mode (eGaN) and depletion mode (dGaN). At different switching frequencies, dGaN and eGaN HEMT has their own unique advantages. This thesis applies dGaN and eGaN HEMT transistors on LLC half- bridge series resonant converter, making use of the property of ZVS and ZCS to reduce their switching loss at higher switching frequency. Synchronous rectifier is utilized on the secondary side to minimize the conduction loss resulted from the high output current. In addition, the use of a planar transformer has replaced the usually applied winding transformer in order to minimize the volume and boost its whole power density. In the end of the thesis, we built two LLC half bridge resonant converters operated at 1 MHz to perform the conversion from 380 V to 12 V with rated power of 500 W, in order to compare the properties of dGaN and eGaN. After comparing the data with the experimental results, it showed that when applying to 1 MHz, the power efficiency of the eGaN version has advantage over the dGaN version.
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Jiang, Zong-Sian, and 江宗憲. "Interleaved LLC Half-Bridge Series Resonant Converter with Integrated Transformer." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/64pnfy.
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碩士國立臺灣科技大學
電子工程系
106
In order to reduce the line power dissipation and wire stress caused by high output current. This thesis connects two parallel LLC-SRC circuits with a 90° phase shift to eliminate the output current ripple for high circuit efficiency. However, the conventional interleaved LLC-SRC may cause unbalanced secondary output current and bad output current ripple cancellation due to the differences of two transformer. This thesis integrates two transformers into same core with core integrated technology. By replacing the usually applied winding transformer with planar transformer, the differences of two transformers would be reduced and balancing the secondary output current.
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Lin, Chang-Kuei, and 林長貴. "Analysis and Design of 500W Half-Bridge LLC Resonant Converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/36137956038703693930.
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碩士東南科技大學
電機工程研究所
97
This thesis presents the design considerations of a 500W half-bridge LLC series resonant converter (LLC-SRC). Three kinds of the operation regions are described including (1) Region 1: fs >fr1, (2) Region 2: fr2
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Huang, Chia-mo, and 黃嘉模. "Design of a High-Efficiency Half-Bridge LLC Serise-Resonant Converter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/49201201186464891221.
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碩士國立臺灣科技大學
電子工程系
95
This thesis describes design approach and considerations of a half-bridge LLC series resonant converter（HB LLC-SRC）. In general, two operating modes (intervals) are defined in a HB LLC-SRC with zero-voltage-switching (ZVS). The first interval of ZVS is when the switching frequency is higher than the first resonant frequency（fs＞fr1）. The second interval of ZVS is between two resonant frequencies（fr2
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Yang, Shun-Yi, and 楊順益. "Design and Implementation of 500W Half -Bridge LLC Series Resonant Converter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/96966442064041116972.
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碩士國立臺灣科技大學
電子工程系
95
Abstract A realization study of half-bridge LLC resonant converter with zero-voltage-switching (ZVS) is proposed in this thesis. The proposed converter is designed to operate in the frequency above the first resonant frequency. Analysis and design consideration for implementing a 500-W LLC converter are conducted thoroughly. A design example of 500-W LLC converter is examined with input voltage 380Vdc and output voltage 48Vdc. High efficiency up to 93.2% is achieved and its performance is close to the theoretical prediction.
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Hsu, Wei-li, and 徐維利. "Realization Study of Synchronous-Rectified LLC Series-Resonant Half-Bridge Converter." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/2m3m8a.
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碩士國立臺灣科技大學
電子工程系
94
This thesis focuses on the design of a half-bridge LLC series resonant converter (SRC) with synchronous rectification (SR). Generally, the operation of SR-LLC-SRC can be in the ranges of wr2< ws,min< wr1 and wr1< ws,min. For SR-LLC-SRC, only the operation of ws,min> wr1 is valid. In this thesis, a synchronous rectification strategy for LLC-SRC is proposed with a voltage-clamped drive circuit, which is designed to simultaneously drive primary-side switches and secondary-side rectifiers. In this thesis, no high/low-side driver circuit is required for the driver of pair power switches. The dynamic performance of the proposed SR-LLC-SRC is simulated by IsSpice and the design considerations are examined thoroughly. A design of 250W SR-LLC-SRC is examined and compared with the conventional LLC-SRC, and a high efficiency up to 94% at full load is achieved. All performances verified by simulation and experiment are quite well close the theoretical predictions.
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Yu-KaiChen and 陳昱凱. "Design and Implementation of Two-Phase Interleaved Half-Bridge LLC Resonant Converter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/64973421992335784126.
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碩士國立成功大學
電機工程學系碩博士班
100
This thesis focuses on the design and implementation of two-phase interleaved half-bridge LLC resonant converter. In the front stage, in order to improve power factor and reduce the input and output current ripple, two boost power factor correction converters are connected in parallel with the 180° phase-shift, and use the variable output voltage technology makes power factor correction converter output voltage with the AC input voltage level changes to reduce the switching losses. In the second stage, two-phase interleaved LLC resonant converter is parallel-connected by two LLC resonant converters with synchronous rectifier in 90° phase-shift drive to reduce the output current ripple, and use the phase management circuit to determine whether to operate the dual LLC resonant converters or a single operation to improve light load efficiency. The first study discusses the structure of the circuit in this thesis, and then analyzes the operation and design processes. Finally, a 480W two-stage AC/DC power converter with output of 12V/40A is implemented. The maximum efficiency of the system can reach up to 93.59% under 115Vrms AC input voltage.
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Tsai, Chih-Hao, and 蔡志浩. "Analysis and Implementation for A Half-Bridge DC/DC LLC Resonant Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/32634285998242644244.
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碩士國立成功大學
工程科學系碩博士班
96
In general,front-end DC/DC converters are classified into two types of pulsewidth modulation converters and resonant converters. Since a PWM converter is operating in hard switching, it leads to large switching losses so that the efficiency is degraded. A resonant converter with soft switching is thereby developed to reduce the switching loss and increase the efficiency. Therefore, an LLC resonant converter is investigated in this thesis. It is employed as the front-end DC/DC converter with high efficiency, high power density and high reliability on its performances. In the thesis, three types of traditional resonant converters are introduced. They are series resonant converter (SRC), parallel resonant converter (PRC) and series parallel resonant converter (SPRC, or LCC). The switching frequencies of these converters must increase to maintain a regulated output voltage, when the input voltage increases and the load becomes light. However, more circulating energy will be resulted form the higher switching frequencies. To proceed, the operating principle of an LLC resonant converter is presented. Its performances are compared with those of an LCC resonant converter. The LLC resonant converter exhibits the advantages over LCC converter. The main switches achieve ZVS operation and rectifier diodes have no reverse recovery current. The ZVS operation region of the converter increases when the loads become light. The circulating energy is still small even if the input voltage increases. Finally, the theoretical analysis is validated by IsSpice simulations and experimental results. It reveals that the LLC resonant converter achieves ZVS operation despite variations in input voltage and load resistance. A prototype of output LLC resonant converter with efficiency of is implemented in this thesis.
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Hsieh, Shih-hung, and 謝士弘. "Realization Study and Design Considerations of LLC Series-Resonant Half-Bridge Converter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/19610431907442258436.
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碩士國立臺灣科技大學
電子工程系
95
This thesis focuses on the design considerations of a half-bridge LLC series resonant converter (LLC-SRC). There are two operation modes in the LLC converter, including (1) Region 1: fs >fr1 for SRC mode, where fr1 is the dominant resonant frequency and fs,min is the minimum switch frequency and (2) Region 2: fr2
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Guo, Yi-Siang, and 郭亦翔. "LLC Half-Bridge Resonant Converter with Sensorless and Automatically-Adjusted Blanking Times." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/35r585.
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碩士國立臺北科技大學
電機工程研究所
105
As for the traditional LLC half-bridge resonant converter, there is problem in efficiency at light load. In order to keep the output voltage of this converter constant at a given value at light load, the switching frequency will be increased, and hence the efficiency would be degraded. Consequently, based on frequency modulation and from the point of view of banking time tuning, the efficiency at light load will be improved. In this thesis, the basic operating principle of the LLC half-bridge resonant converter is described, analyzed and verified by PSIM, and afterwards the strategy for automatically adjusting the blanking time is described and analyzed. Finally, the digital signal processor, named UCD3138, is used as a circuit control kernel, and a prototype, with input voltage of 400 10V, rated output voltage of 12V and rated output current of 20A are used to demonstrate the effectiveness of the proposed strategy.
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Wang, Chao-Chun, and 王超駿. "Optimization Design of LLC Half-Bridge series-Resonant Converters." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/14838067190596831519.
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碩士中原大學
電機工程研究所
96
This thesis primarily aims to achieve the most highly optimal design for LLC-SRC in terms of safety, stability and reliability. The main circuitry used is LLC-SRC as it is able to achieve high efficiency, low level of EMI emissions, and high power density. Investigation of LLC-SRC design was conducted by using the L6599 PWM IC of STMicroelectronics. The optimization design of LLC-SRC was achieved to implement a 90W PSU. It is able to achieve high efficiency and meet EPA regulation. The electrical functions compares with experimental results and a laboratory prototype are measured in detail. The electrical functions are satisfactory.
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Chou, Kuan-Fu, and 周冠甫. "Design and Implementation of A Single-Stage Asymmetrical Half-Bridge LLC Resonant Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/18877956350462035523.
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碩士國立臺灣科技大學
電子工程系
103
This thesis presents a single-stage asymmetrical half-bridge LLC resonant converter, which consists of a boost-type power factor corrector (PFC) and an asymmetric half-bridge LLC resonant converter. The PFC stage adopts the voltage-follower control operating under discontinuous conduction mode. It helps to reduce the volume of the boost inductor. The current control loop is not required to reduce the circuit design complexity. By utilizing dual control function to adjust the duty cycle and the switching frequency, the proposed converter features wide range of input voltage,low output ripple,zero-voltage switching (ZVS),and zero-current switching (ZCS). This advantages are in favor of the design for high power density. The operating principle of the proposed converter has been analyzed, described and discussed in detail. The simulation using, Mathcad and SIMPLIS, were used for circuit design. The experimental results with the wide input range 85 Vac~264 Vac and an output of 19 V/120 W reveal a maximum efficiency of 90% and a maximum power factor of 0.99
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Hsieh, Meng-Lun, and 謝孟倫. "Design and Implementation of Variable Frequency LLC Half-Bridge Resonant Wireless Charging Converter." Thesis, 2019. http://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22107NCHU5441030%22.&searchmode=basic.
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碩士國立中興大學
電機工程學系所
107
The objective of this thesis is to use the LLC half-bridge resonant converter to replace the traditional transformer for wireless chargers. We change the main transformer of the traditional variable frequency LLC resonant converter to an inductive coil. The leakage inductance is used to participate in resonance as a magnetizing inductance so as to save circuit space. The feedback circuit architecture first uses the TL431 as a voltage regulator circuit to achieve a stable output voltage function within an acceptable variable load. The UCC25600 half-bridge resonant controller is employed to control the switching frequency range and dead time of the gate input signal. Prediction of the voltage value on the side of the switching element allows the half-bridge resonant switch to reach zero voltage switching conditions so that reduction of switching losses is achieved.
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Yang, Ting-Yueh, and 楊庭越. "Design and Implementation of Half-Bridge LLC Resonant Converter with Power Factor Correction." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/06709326266127480533.
Full textAbstract:
碩士國立中央大學
電機工程學系
105
This thesis focuses on the design and implementation of a high power factor and efficiency LLC Resonant Converter. The front-end part of the converter is a boost power factor corrector (PFC), used not only to eliminate the current harmonics but also to raise the power factor (PF). The second stage is a half-bridge LLC Resonant Converter. To achieve high power density and high conversion efficiency requirements, the LLC resonant converter utilizes the parasitic capacitances and diodes of the power switch to achieve ZVS, which reduces the switching loss. Besides, this thesis explains the operating principle of the two circuit architectures, and the detail design considerations of component parameters. All the analysis, design and simulation of the LLC resonant circuit are based on the first harmonic approximation (FHA) of the circuit. This thesis designs a 250W AC to DC converter with ac input voltage is 90 ~ 264VAC, output voltage and rated current are 53V and 4.72A respectively. The overall PF is above 0.94. The overall average efficiency can reach 90% and its maximum efficiency is close to 94% for the full load condition. Finally, experiment results are given to verify theoretical analysis. Moreover, future research directions are indicated.
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Liu, Yao-Wen, and 劉耀文. "Implementation of a High Efficiency LLC Resonant Half-Bridge Converter with Synchronous Rectifier." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/55703634168362455464.
Full textAbstract:
碩士輔仁大學
電機工程學系碩士班
101
This research presents the design and implementation of a half bridge LLC converter with synchronous rectifier. The boost circuit is operation in continue conduction mode (CCM). Efficiency will improve over 90% when it is designed to operate on high frequency and over resonance frequency. and also can obtain the on zero voltage switching (ZVS) and zero current switching (ZCS) on the main switches. It is useful to reduce the output harmonic and stable the output voltage when using resonance circuit. We reduce the MOSFET switching losses by using the ZVS and ZCS techniques. Due to calculate circuit impedance and resonance inductance design which reach high power factor and efficiency in half bridge LLC converter circuit. Finally, a prototype of 400 W half bridge LLC converter which using input of 115 Vac to 240 Vac is employed to verify and validate the performance improvement and to achieve the converter efficiency above 94%.
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Liang, Cherng-huei, and 梁成輝. "Design and Implementation of Interleaved LLC Half-bridge Resonant Converters." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/47910954625498361254.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
96
In this thesis, interleaved LLC half-bridge resonant converters are designed and implemented. In order to increase output power, two LLC resonant converters are parallel-connected. Two gate driver signals of switches are interleaved by 90 degrees to reduce output-current ripple. Besides, switch losses on power devices can be reduced by zero voltage switching(ZVS) and output diode with zero current switching(ZCS). The characteristics of the proposed topology are discussed, and the operation principles and design process are also addressed in this thesis. Finally, interleaved LLC half-bridge resonant converters with input 380~420 V and output 24 V/20 A is implemented to verify the theoretival feasibility.
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Jia-HongChen and 陳佳鴻. "Design and Implementation of a Dimmable LED Driver with Half-bridge LLC Resonant Converter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/68670695458781864315.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
100
In this thesis, the design and implementation of a dimmable LED driver with half-bridge LLC resonant converter is presented. The front-stage of the proposed topology is a boost power factor correction circuit and the rear-stage is a half-bridge LLC resonant circuit. To make the PFC circuit operated in continuous conduction mode, a average current controller is used. The half-bridge LLC resonant converter enables the MOSFETs to operate at zero voltage switching and output diode to achieve zero current switching. The voltage gain and operating principle of the half-bridge LLC resonant are presented. In addition, the pulse width modulation dimming function is discussed. Finally, a half-bridge LLC resonant LED driver is implemented with input voltage 90~264 Vrms, 150 W LED module in the laboratory. Experimental results show that the power factor is over 0.98 and the maximum efficiency is up to 90.8%.
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Pan, Ming-Ho, and 潘明禾. "Implementation of single-stage half-bridge LLC resonant converter with high power factor correction." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/12950332792922004729.
Full textAbstract:
碩士清雲科技大學
電機工程研究所
94
The object of the thesis is to study and implementation of a single stage LLC resonant converter with high power factor. While the power factor correction (PFC) is achieved by the boost topology in discontinuous conduction mode, the energy conversion is realized by LLC resonance operating at zero-voltage switching. Through thorough theoretical analysis, computer software PSIM has been used to assist the study and design of the converter, with frequency control used to regulate the output voltage. By integrating the resonant inductor into transformer, a converter with power rating 125W and output voltage 28V has been implemented to verify the design. As a result, the measured PFC of the converter at both heavy and light loads reaches to 0.99 and the maximum efficiency at full load is of 91%. Besides, the output diodes enjoy low di/dt at turn-on and off. The converter displays good performance in the experiments.
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Hu, Hong-Sin, and 胡宏新. "System Design and Implementation of the Half-Bridge LLC Resonant Converter for Efficiency Improvement." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/20026842109199643897.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
103
This thesis included the theoretical derivation of the LLC resonant converter for the transfer function and feedback control. The impact of the curve of transfer functions was made further explored through analysis and calculation of the parameters of the transfer functions. This thesis used detailed design procedures to achieve the design and to simulate how to build an LLC resonant converter. The main simulation software is SIMetrix/SIMPLIS which builds the block module of power IC control. Using frequency conversion control changed the characteristics of the resonant slot to achieve the purpose of the output voltage modulation. The design of dead-time interval avoided short-circuiting of the power switch. Zero-switching technology reduced switching losses. This thesis implemented a 120W half-bridge converter. which has input voltage, 380V, and output, 24V/5A. The efficiency was up to 91.37%. The measurement waveform from light load to full load verified the theoretical analysis and planning system features. Finally, the efficiency in this thesis was compared with the efficiency in the existing literatures. The comparison results show that following the system design steps of this thesis enables designers to easily start and get the better system efficiency.
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Yeh, Chin-Lun, and 葉晉綸. "Conversion Efficiency Analysis for the Effect of Resonant Inductance in a Half-bridge LLC Series Resonant Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/h83kqp.
Full textAbstract:
碩士國立中山大學
電機工程學系研究所
106
Under the fixed transformer excitated inductance of LLC series resonant converter, different resonant inductances in the resonant tank result in different resonant frequencies, resonant inductance ratios and trends of frequency response gain;therefore,the conduction loss and conversion efficiency will be affected. It is helpful to analyze the frequency of the resonant inductance and its relationship with the conduction loss to further improve the conversion efficiency of LLC series resonant converters. The influence of different resonant inductances on the conversion efficiencies of the LLC series resonant converter is analyzed in this thesis. Three different loss estimation formulas investigate the effects of the currents of resonant inductances and secondary side of the transformer on the conduction loss under different resonant inductances are discussed. It can be observed from the analysis results, through the selection of resonant inductor, LLC series resonant converter can obtain better conversion efficiency under different loads. A LLC series resonant converter with a rated input voltage of 380V DC, a rate output voltage of 48V DC and a rated output power of 1200W is designed and implemented in this thesis. Several resonant inductances are used in the implemented converter to measure the conversion efficiencies under different loads and then compared with the loss estimation formulas to verifiy the effect of resonant inductances. Experimental results show that by selecting an appropriate resonant inductance the maximum conversion efficiency improvement of 8% and 1.43% for light load and heavy load can be achieved, respectively.
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Lin, Ming-Che, and 林明哲. "The Design and Implementation of LLC Resonant Half-Bridge Converter with CCM Power-Factor-Correction." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/90094981909990725428.
Full textAbstract:
碩士國立高雄應用科技大學
電機工程系
98
This thesis focuses on the design considerations of LLC resonant half-bridge co- verter. The impact of Q and parameter on the LLC resonant half-bridge transfer function is analyzed and use the MATLB to draw the curve of the transfer function. By the first fundamental harmonic approximation to analyze the LLC resonant half-bridge converter, we can derive the relationship between the resonant tank current and the zero voltage switching of power transistors. We also consider the different requirements for the Q parameter in light load and heavy load and select the appropriate Q parameter value, with which the the LLC resonant half-bridge converter has the better efficiency at both ligh load and heavy load. We verify the system operation by IsSpice, then a prototype 150W LLC resonant half-bridge converter is built through complete analysis and optimum parameter desi- gn. The efficiency of LLC resonant half-bridge converter can reach 94%. When the L- LC resonant half-bridge converter is collocated with ZVS-CCM power factor corrector, the maximum whole system efficiency is 87%. When the LLC resonant half-bridge converter is collocated with typical CCM power factor corrector, the maximum whole system efficiency is 88% which is above the commercial specification 85%.
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Chen, Chieh-Liang, and 陳玠良. "Study and Implementation of High Efficiency LLC Half Bridge Series Resonant Converter with Variable Frequency." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/50458932591818571809.
Full textAbstract:
碩士國立臺灣海洋大學
電機工程學系
99
This thesis focuses on the study and implementation of a LLC series resonant converter with synchronous rectification which is to develop high-efficiency for power converters. Among many switching power supply topologies, there are many advantages in LLC resonant converters. It makes full use of parasitic components and technologies to achieve zero voltage resonant switching to reduce switching losses and reduce the adverse effects caused by parasitic components. It can be obtained by variable frequency mode to increase the output gain when the input voltage drops. However, for LLC resonant converter, the output voltage drift is caused by voltage instability when there is no load or light load.Therefore, the subject of article comprises converters which are operating at light load or no load. The combination of burst mode is to improve the system characteristics. At the same time, it will reduce the standby losses. This thesis is for describing the LLC structure operations and design. MATHCAD software was used to simulate the voltage frequency response and to understand the influence quality factor Q and the K factor of circuit. Finally, a 120W prototype converter with input 220 VAC and output 12VDC is implemented to verify the theoretical analysis and control strategies. Experimented results show that LLC resonant converter with synchronizer rectifier can provide power to a computer or LED lighting and suitable for energy-saving concept in the future.
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Zhang, Chi-qun, and 張智群. "Study and Implementation of a Half-Bridge LLC Series Resonant Converter with PFC Pre-regulator." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/g6d3cq.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
99
In this thesis, a 400-watt power supply is made for AC-DC power user for satisfying the energy saving policy. The output specifications of the developed power supply are Vo=20V and Io=20A. A boundary current mode power factor correction (BCM/TM PFC) circuit is adopted as the pre-regulator to enhance the conversion efficiency, raise input power factor and reduce input current harmonics. The DC-DC stage is implemented by using a half-bridge series resonant converter (SRC) topology operated in LLC mode to provide 20V output. The inherent zero-voltage switching feature reduces the switching loss of primary power switches. Both the conversion with excellent efficiency and power factor are the targets which meet the requirements of green energy specififations.
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Huang, Wei-Chiuan, and 黃偉銓. "ANALYSIS AND IMPLEMENTATION OF A HALF-BRIDGE LLC RESONANT CONVERTER WITH FRONT-END POWER FACTOR CORRECTION." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/52323829920070832106.
Full textAbstract:
碩士大同大學
電機工程學系(所)
97
This thesis presents a half-bridge LLC resonant converter for large scale LCD TV power supply. The circuit configuration consists of a boost converter for power factor correction and a half-bridge LLC resonant converter. The PFC circuit operates in continuous current mode to achieve a high power factor and reduces the input current harmonic. The transfer function of the LLC resonant converter can be obtained by using the circuit impedance, ratio of resonant inductance, and quality factor. With proper selection of the resonant tank and modulation of the operation switching frequency, the proposed circuit can achieve zero voltage switching (ZVS), stabilize the output voltage, and then reduce the switching loss. In addition, the operation modes and dc characteristics are discussed for designing the resonant tank. A prototype of a 480W-LLC resonant converter having a high power factor with AC input 110V~230V and DC output 66V/7.27A is constructed. Experimental results of the ZVS prove that the proposed circuit can achieve the requirements.
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Tsao, Lee-Wen, and 曹力文. "Analysis and Implementation of an Asymmetrical Half-Bridge LLC Resonant Converter with Active Power Factor Correction." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/97374882333294658040.
Full textAbstract:
碩士國立臺灣大學
電機工程學研究所
96
The thesis is to analyze and implement an asymmetrical half-bridge(AHB) LLC resonant converter with active power factor correction. High efficiency, small size, low cost, high switching frequency are always the main goals of designing power supplies. Among various topologies, the load-dependent asymmetrical half-bridge LLC resonant converter becomes more and more popular because of its simple structure, less components, high efficiency and high power density. The converter utilizes a resonant capacitor, the leakage inductance and the magnetizing inductance of a transformer, and the variation of the load to make the converter resonant in a proper region. In this way, ZVS and ZCS can be achieved by the mutual interaction of the parasitic capacitance and the body diode of the power MOS. Therefore, the switching loss and the current stress of the switch is relieved and the efficiency of the converter can be enhanced. However, in addition to improve the efficiency of a converter, developing a converter with an active mode PFC pre-regulator is important nowadays. Therefore, the AHB LLC resonant converter proposed in the thesis utilizes a boost-basic PFC pre-regulator to achieve a high power factor for optimizing the use of power. A 150W AHB LLC resonant converter is implemented to verify the theoretical analysis.
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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.
Full textAbstract:
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.
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Wang, Chao-Chun, and 王超駿. "Optimization Design of Synchronous Rectification for High-efficiency LLC Half-bridge Resonant Converters." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/25272233767132704030.
Full textAbstract:
博士國立臺灣科技大學
電子工程系
103
This dissertation mainly aims to study the optimal design for half-bridge LLC resonant converter with synchronous rectifier. In order to further improve the efficiency and reliability, zero-voltage switching, compensated sensing of synchronous rectifier technologies and integrated drivers are adopted. Operating principles and design considerations are analyzed and discussed in detail. The experimental results of a 12V/ 200W laboratory prototype are shown to verify the feasibility of the proposed scheme. The highest efficiency is achieved to 97.6% at 100% load. The average efficiency is achieved to 95.7% at 10% to 100% load conditions.
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Yang, Ming-Kai, and 楊明凱. "The Design and Implementation of LLC Resonant Half-bridge Converter with Soft Switching CCM Power-Factor-Correction." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/33812240806508949105.
Full textAbstract:
碩士國立高雄應用科技大學
電機工程系
99
This thesis focuses on the analysis and design of LLC half-bridge converter with soft switching CCM-PFC circuit. At first, this thesis proposes the CCM (Continuous Conductuon Mode) Power Factor Corrector. Since the input current of CCM-PFC is continuous, there will be smaller electrical interference (EMI) and better power quality. The peak value of inductor current and switch current are also lower than DCM (Discontinuous Conductuon Mode) PFC. Therefore the CCM-PFC is suitable for high power application and its efficiency is also higher than DCM-PFC. This thesis adopts a new zero voltage switching technique in the CCM-PFC design to further improve its efficiency. Then, the characteristics of the LLC resonant half-bridge converter will be analyzed in this thesis. The impact of Q and λ parameter on the LLC resonant half-bridge transfer function is analyzed by using the MATLB to draw the curves of the transfer function. And obtain a clear understand of the influence of the Q value and λ parameter on the curves. Then a clear analysis and design criteria is provided for the LLC resonant half-bridge converter in order to make the circuit design easier. Finally, the system operation is verified by IsSpice, and a prototype 200W LLC half-bridge converter with soft switching CCM-PFC is implemented. The efficiency of the front stage soft switching CCM-PFC circuit can reach 95.5%, and the maximum efficiency of the rear stage LLC resonant half-bridge converter is 93%. The maximum whole system efficiency is 88.5%, and higher than the current industry specification of 85%.
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HSU, HONG-YUAN, and 許鴻源. "Study and Implementation of LLC Series-Resonant Half-Bridge Converter with Power Factor Correction and Synchronous-Rectification." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/5sjq64.
Full textAbstract:
碩士國立高雄應用科技大學
電機工程系博碩士班
104
This thesis focuses on the study and implementation of LLC resonant half-bridge converter with power factor correction and synchronous-rectification. The system architecture also includes inrush current limit circuit, surge protect circuit and EMI filter. The front-end stage uses active boost power factor corrector with average current control to eliminate the current harmonics and raise the input power factor. The second stage uses LLC series-resonant half-bridge circuit so that the switching element can reach zero-voltage switching to reduce switching losses. The output terminal uses synchronous rectification further reduce conduction losses and achieving high efficiency. This thesis describes the basic principles and analyzes the operation PFC and LLC characteristics, discusses the key elements selection of the circuit and the magnetic component design method, and gives a detailed instruction for the LLC integrated transformer winding methods. Finally, using circuit simulation software PSPICE to simulate LLC in open-loop manner. The choice of resonant element could be guaranteed to have ZVS characteristics by PSPICE. The study implements a 200W of AC-DC power supply, and the input voltage range is 90 ~ 264Vac, output voltage is 24Vdc, and he full load current is 8.3A. When input is 110Vac and output is full load, the efficiency is 90.88%. At 220Vac input and full load of output, the efficiency is 93.44%. The experimental results meet theoretical design.
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Hsieh, Chu-chung, and 謝儲仲. "Study and Implementation of a Double-Output Half-Bridge LLC Series Resonant Converter with Wide Input Voltage Range." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/03766050580128780590.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
97
This thesis focuses on the study and implementation of a 500-W double-output half-bridge LLC series resonant converter with wide input voltage range. The influences of the quality factor (Q), K factor (K), characteristic impedance (Zo), and turns radio (n) on the voltage gain transfer function have been analyzed and discussed by using the MATHCAD software. Since the implemented converter has two main outputs, there exists a phenomenon called cross regulation, which results in poor output voltage regulations when one output is at heavy load and the other at light load. In order to satisfy the output voltage regulation specifications, two transformers and two resonant tanks have been adopted for the presented converter in this thesis. According to the formulated design procedures, each resonant tank component can be designed. Then circuit parameters are fine tuned and modified. Finally, a double-output half-bridge LLC series resonant converter is implemented. The input voltage range is 380V ~ 400V. The specifications of the two main outputs are 12V/2A-35A and 5V/0.3A-15A. And the output voltage regulation is within 5 percent.
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Chung, Wang-Ting, and 鍾旺庭. "A General-Purpose Gate Driver with Automatic Dual-Sloped Control for 400V 10MHz Half-Bridge LLC Resonant Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/jknqnr.
Full textAbstract:
碩士國立交通大學
電子研究所
107
In recent years, the environmental awareness has risen, and electrical products with power-saving functions have gradually received attention. AC-DC adapters are found in most home appliance and have become one of the major improvement targets. Among the application, isolated DC-DC converters play an indispensable role. In addition to high power conversion efficiency (PCE) and high power factor (PF) at the input voltage of the mains (90VAC~ 264VAC), the use of increased operating frequency to shrink the volumes of the filters and energy storage elements is the important trend currently. In this thesis, a gate driver of a high-voltage half-bridge LLC resonant converter (LLC-RC) is designed. The input voltage of the converter is 400V, and the output voltage is 20V. The input voltage range of the gate driver is 6-12V, and the operating frequency is set to 10 MHz in order to achieve the purpose of reducing the energy storage elements. In order to suppress the gate voltage surge, the gate drive circuit uses the gate voltage slope control function. The automatic dual-sloped control (ADSC) mechanism is added to afford general-purpose function when applying to power switches of different specifications. This gate driver is implemented in TSMC 0.25 μm HV CMOS process. We only use 12V high voltage elements in order to balance the minimum circuit postpone and the wide output voltage range of the gate drive circuit when applying to the different threshold voltage power switches.
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Chen, Chen-Yi, and 陳一辰. "Design and Implementation of High-Efficiency Multi-Output Half-Bridge LLC Resonant Power Converter with Remote Dimming Control." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/12862031274638595477.
Full textAbstract:
碩士國立高雄第一科技大學
電子工程研究所
103
In this thesis, presents a high-efficiency multi-output half-bridge LLC resonant power converter with remote dimming control. Its architecture is divided into two stages; the first stage is an active power factor correction (APFC) circuit for power factor correction to improve power quality. The post-stage is a half-bridge LLC resonant converter circuit to achieve stable output power by designing resonant circuit with switching frequency modulation. All of the power switches possess zero voltage switching (ZVS) feature in the system for greatly reducing the switching losses and achieving high efficiency. Digital remote control uses dsPIC30F4011 microcontroller and remote control interface to control the output currents and dimming of four LED modules. Finally, a multi-output highly efficient half-bridge LLC resonant power converter with remote dimming control is implemented, its input voltage is AC 110V~240V, output power is 200W, output current is 4A and its efficiency and power factor can achieve 93.5% and 0.99, respectively. The experimental results have verified the feasibility and effectiveness of the proposed power converter.
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Liang, Lin Kuan, and 林冠良. "Study on the Half-Bridge LLC resonant Converter at Light Load Condition and its Application on Charging Systems." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/04975820879971214224.
Full textAbstract:
碩士明新科技大學
電機工程研究所碩士在職專班
102
The LLC resonant converter can switch to achieve zero voltage switching (ZVS) and secondary side rectifier diodes to achieve zero-current switching (ZCS), and high efficiency when it operated at high input voltage, and further resonant inductor and magnetizing inductor could be integrated into one magnetic structure for LLC, that just can reduce volume and cost down, so it used popularly in power product. This thesis discussed about Light load of LLC resonant converter applied to Lithium Battery Charger, the output voltage regulation failure when switching frequency limited and gain reduce insufficient by controller. We propose to modulated input voltage of LLC resonant converter for gain enough, and constructed a Lithium Battery Charger having power factor correction with AC input 110V of maximum output power 252 watt, the output voltage range 30~42V and output current range 0.5A~6A. Experimental results of the proposed condition can achieve the requirements.
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Kuo, Yi-Hsien, and 郭怡賢. "Half Bridge LCL Resonant Converter and Voltage Multipliers for Supercapacitor Equalization Applications." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/52895291086513116650.
Full textAbstract:
碩士輔仁大學
電機工程學系碩士在職專班
104
Supercapacitors are widely applied in electronic products. They usually need to be used in series connection to lift higher operating voltage for system application due to low rating voltage of individual supercapacitor. While the supercapacitors are employed in the series connected energy storage pack, the imbalanced voltage issue must be taken care from overvoltage damage under charging mode due to difference in capacitance, internal resistance and leakage current of individual cell. The proposed half bridge LCL resonant converter and voltage multiplier equalizer which transfer energy from high voltage cells to low voltage ones by using combination of capacitors and diodes for achieving the voltage balancing control. Thus, the proposed equalizer can reduce the complicated circuit design process and save cost to extend series-connected supercapacitors life time and reliability.
45
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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Lee, Yao-Chou, and 李曜州. "Design of PC Power Supply Using Half Bridge LCC Series-Parallel Resonant Converter." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/26040721141831367291.
Full textAbstract:
碩士逢甲大學
電機工程所
94
This thesis introduces all kinds of resonance converters, and explains the basic principle of the resonance converter. The circuit characteristic of half bridge LCC series-parallel resonance converter is presented. A half bridge LCC series-parallel resonant converter for PC power supply is proposed. The voltage regulation using variable frequency control is investigated for 12V, 5V and 3.3V under different load conditions. The proposed converter is carried out by simulations using IsSpice. The validity of this converter is guaranteed by the obtained results. Finally, the converter of 3.3V output voltage is established to validate the characteristics of the proposed converter.
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Huang, Chong-Bo, and 黃崇柏. "Design and Implementation of LLC Half-Bridged Series-Resonant Converter with Synchronous Rectification." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/pwx43u.
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
In this thesis, an LLC half-bridged series-resonant converter with synchronous rectification (SR) is given, whose efficiency is improved via zero-voltage switching (ZVS) to reduce switching loss and via SR to reduce conduction loss. However, there is a problem existing at light loads in this converter. This problem is that the switching frequency is forced to dramatically increase at light loads in this converter so as to keep the output voltage constant at the required value, thereby causing the corresponding switching loss to be enlarged. Consequently, combining frequency modulation (FM) and pulse width modulation (PWM) is presented herein so as to make the output voltage easy to be stabilized at light loads as well as to improve the corresponding efficiencies. At last, one LLC half-bridged series-resonant converter with SR, controlled by CM6900G IC made by CHAMPION Ltd., is implemented with the input voltage of 380V, the rated output voltage of 12V, rated output current of 37.5A, to verify the presented control scheme.
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Lin, Yi-Cheng, and 林奕政. "Study and Implementation on Start-Up Control of Full-Bridge LLC Resonant Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/8x5dc3.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
105
This thesis aims to study and develop a start-up surge-current-restraining strategy for a full-bridge LLC resonant converter. The idea of this thesis is to first operate the full-bridge LLC converter at half-bridge mode, therefore halve the resonant tank voltage into half of input voltage. Afterwards, frequency modulation control and phase-shift modulation control are also applied to suppress resonant tank energy. In addition, the relationship between resonant current, output voltage, and switching frequency based on state plane analysis is investigate to obtain the frequency adjusting curve under the consideration of resonant current limitation. The operating frequency consequently is modulated according to the curve to limit resonant current. At the end of this thesis, a full bridge series resonant converter with 480W, input voltage 400 V, the output voltage 48 V, and the resonant frequency 100 kHz is used as the test platform to compare the method with general method. The experimental results show that the advantage of this method can use lower initial frequency, and be effective to suppress the surge current during start-up moment.
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TU, MING-YU, and 涂明瑜. "Implementation of Full-Bridge LLC Resonant Converter with Series-Input/Parallel-Output Transformer." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/dzftvt.
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碩士南臺科技大學
電機工程系
107
This thesis proposed a full-bridge LLC resonant converter with series-input/parallel-output transformer. Series resonant converter (SRC) is capable to achieve the converter's switches are operating in zero voltage switching (ZVS). Architecture of this proposed thesis is adopt a dual transformer, which is primary side is series connection as well as secondary side is parallel connection to obtain quite higher current. In this thesis, the converter will be detailed description in operation principle and state analysis. Otherwise, the operating range of converter will be designed which is depend on the analysis result and ensure the switches of converter are operating in ZVS to reduce the conduction loss. The dual transformer divides the output load current evenly, decrease the transformer bulk, and it will be result in high power application more easily. At last, a full-bridge LLC resonant converter with series-input/parallel-output transformer of 80 to 120 V, output voltage of 24 V and output power of 200 W are realized. The experimental results verify the feasibility of the proposed resonant converter.
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Liu, Ying-San, and 呂銀山. "Design and Implementation of Full Bridge LLC Resonant Converter with Two Output Voltages." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/97449107379351734445.
Full textAbstract:
碩士國立雲林科技大學
電機工程系
102
The study and implementation of a full-bridge LLC resonant converter with dual outputs are presented in this thesis. The proposed converter can provide one or two output voltages for medium power applications. In conventional DC to DC converters, the pulse-width modulation or resonant switching frequency is normally adopted to regulate output voltage. The resonant switching frequency scheme can provide more advantages such as zero voltage switching turn-on for all power switches and zero current switching turn-off for rectifier diodes. The switching losses on power semiconductors can be reduced. Therefore, the resonant converter based on full-bridge LLC circuit topology is adopted to increase the circuit efficiency and power density. In the thesis, two transformers with series connection at primary side and parallel connection at secondary side are used in the proposed resonant converter to achieve the functions of load current sharing, low current stress of passive components, zero voltage switching for power switches and zero current switching for rectifier diodes. Finally, experiments based on a prototype converter with 400V input and 48V and 24V outputs are provided to demonstrate the effectiveness of the proposed converter.