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Dissertations / Theses on the topic 'Flyback converter'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Mohd, Mukhtar Nurhakimah. "Efficiency Improvement Techniques for Isolated Flyback and Forward Bidirectional DC-DC Converters." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/23127.

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The information age introduced myriad means for individuals and organisations to stay connected and feel informed. Among those means, email arose as one of the most successful and ubiquitous communication technologies to be enabled via internet access. Today it continues to grow in both the volume of traffic and users each year. We now know that this has resulted in an overabundance of information, which is proving difficult for people to mentally process and productively manage. This is known as “Information overload” and email’s part in this has been termed “email overload”. Among this surpl
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Xi, Youhao. "Zero voltage switching flyback and forward converter topologies." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ40214.pdf.

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Ahmad, Nisar. "Design and Implementation of a High Frequency Flyback Converter." Thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-24598.

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The power supply designers choose flyback topology due to its promising features of design simplicity, cost effectiveness and multiple outputs handling capability. The designed product based on flyback topology should be smaller in size, cost effective and energy efficient. Similarly, designers focus on reducing the circuit losses while operating at high frequencies that affect the converter efficiency and performance. Based on the above circumstances, an energy efficient open loop high frequency flyback converter is designed and operated in MHz frequency region using step down multilayer PCB
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Tian, Feng. "Pulse Frequency Modulation ZCS Flyback Converter in Inverter Applications." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4266.

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Renewable energy source plays an important role in energy co-generation and distribution. A traditional solar-based inverter system has two stages cascaded, which has simpler controller but low efficiency. A new solar-based single-stage grid-connected inverter system can achieve higher efficiency by reducing the power semiconductor switching loss and output stable and synchronizing sinusoid current into the utility grid. In Chapter 1, the characteristic I-V and P-V curve of PV array has been illustrated. Based on prediction of the PV power capacity installed on the grid-connected and off-grid,
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Leung, Hong Man. "SPICE simulation and modeling of DC-DC flyback converter." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36643.

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Zhang, Zhemin. "High-frequency Quasi-square-wave Flyback Regulator." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/77434.

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Motivated by the recent commercialization of gallium-nitride (GaN) switches, an effort was initiated to determine whether it was feasible to switch the flyback converter at 5 MHz in order to improve the power density of this versatile isolated topology. Soft switching techniques have to be utilized to eliminate the switching loss to maintain high efficiency at multi-megahertz. Compared to the traditional modeling of zero-voltage-switching quasi-square-wave converters, a numerical methodology of parameters design is proposed based on the steady-state model of zero-voltage switching quasi-square
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Chiang, Cheng-Chung, and 江成忠. "Flyback Converter with Synchronous Rectification." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/23263717278325510167.

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碩士<br>中原大學<br>電機工程研究所<br>94<br>Abstract The Flyback converter topology is widely used for commercial low power applications. Its great attraction is that it has no secondary output inductors. The consequent savings in cost and volume is a significant advantage. However, a lot of the power losses are concentrated in secondary diode rectifiers, and primary switches. Research efforts should therefore be focused on the development of relatively simple topologies that can reduce these losses. In this thesis, a Flyback converter with synchronous rectification output is presented for low output volta
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Yeh, Yung-Sheng, and 葉永盛. "Analysis and Implementation of Single Stage Parallel Boost-Flyback-Flyback Converter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/15638364135657152615.

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碩士<br>國立交通大學<br>電機學院碩士在職專班電機與控制組<br>98<br>This paper proposes a single-stage boost-flyback-flyback parallel AC/DC converter with single-switch-two-output boost-flyback converter theory. One is the boost-flyback semi-stage that improves power factor and other one is flyback semi-stage that improves the regulation performance and increase efficiency. The proposed converter includes three operation modes- continuous current mode, boundary mode and discontinuous current mode. Various modes would result in various effect on efficiency and power factor under various input voltages and various output
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Lin, Shu Shi, and 林學世. "A Primary Side Control Flyback Converter." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/83018840086236415065.

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碩士<br>國立臺灣大學<br>電子工程學研究所<br>85<br>Flyback converter has been widely used for low power aplications due to its simple structure and low cost. In conventional flyback converter, opto-coupler and TL431 are used in feedback circuit to achieve electrical isolation. However, it not only increases cost but also adds board size and power consumption. The primary side control flyback converter senses the voltage of auxiliary winding to accomplish output voltage regulation. Because the auxiliary winding and PWM control IC are both in the primary side, the use of expensive components is avoided. Therefor
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Shih, Li-Wei, and 施立緯. "Flyback Converter with Current Ripple Reduction." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/47er9a.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>103<br>Employing Power over Ethernet (PoE) technology, power devices (PDs), such as VoIP, security cameras and wireless LAN system node are thus powered over the cable without connecting to an AC source. Therefore, system reliability is increased and a DC-DC converter is built in the power device. Currently, flyback converter with RCD clamped topology is the most commonly used in power device due to it’s simple and low cost for PoE applications. To investigate the pros and cons, a thorough discussion will be provided in the chapter 2. However, it suffers from the pow
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Li, Heng-Yi, and 李恆毅. "Single-Stage Parallel Boost-Flyback Converter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/16540659760349787865.

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博士<br>國立交通大學<br>電控工程研究所<br>98<br>It is known that part of the power is repeatedly processed or recycled in the conventional single-stage (S2) and two-stage AC/DC converters. Therefore, a novel S2 scheme is presented based on the parallel power factor correction (PPFC). In the scheme, the boost-flyback semi-stage containing boost cell and flyback cell is used to generate two energy processing path. The main input power flow stream is processed only by flyback cell and output to load directly. And the remaining input power stream is stored in bulk capacitor by boost cell and then transferred by
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JING-JYUAN, CHIANG, and 江靜娟. "Study and Implementation of Flyback Converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/09262341035472929157.

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碩士<br>東南科技大學<br>電機工程研究所<br>97<br>本論文針對返馳式轉換器做分析研討，深入針對不連續的傳導模式 (DCM)及連續倒通模式(CCM)於返馳式轉換器裡運作方式進行探討。文中分 別針對不連續的傳導模式和連續倒通模式的電路分析和性能評價。又針對 選擇零件和變壓器設計的選用及設計詳細描述。 最後，提出一輸出100 W 返馳式轉換器運作於不連續導通模式和連續導 通模式的設計實例，實驗結果是符合設計。
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Lin, Shu-Shi, and 林學世. "A Primary Side Control Flyback Converter." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/71325325200093371692.

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碩士<br>國立臺灣大學<br>電子工程學研究所<br>92<br>For low power supply applications, flyback converter has been adopted widely because of its simple structure and low cost. In traditional flyback converter, feedback circuit is typically done with the assistance of expensive opto-coupler and TL431, to preserve electrical isolation. However it is not only increases cost but also adds size and power consumption. The primary side control flyback converter senses the voltage of auxiliary winding to regulate output voltage. It can void using expensive element of opto-coupler and TL431. Therefore primary side contro
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Chuang, Fu-Yuan, and 莊富元. "Developments and Applications of Flyback Converter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/35055178583576192902.

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碩士<br>國立高雄第一科技大學<br>電子工程所IC設計及綠色能源產業研發碩士專班<br>99<br>The purpose of this thesis is to study flyback converter and then, applying this type of converter to design dc/dc converter, dc power supply, power factor corrector (PFC), and engine electronic igniter. In dc/dc converter application, a 100W flyback-type converter is implemented with closed-loop control to regulate output voltage. To serve as a dc power supply, flyback-type converter is adopted and designed to provide four different voltages for low power applications. Based on one-cycle control, the flyback-type converter is also developed
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LIOU, GUAN-TING, and 劉冠廷. "Development of Multi-Output Flyback Converter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/7j6rjy.

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碩士<br>崑山科技大學<br>電子工程研究所<br>107<br>Each consumer electronics may require different power voltage level.Hence, the main purpose of this thesis is to complete the development of a sinle-input multi-output flyback DC-to-DC converter. The design of a voltage input range is DC power supply 9V~36V, total power 30W, switching frequency 60kHz~65kHz, output 5V, 12V and 15V. The power converter, and a detailed design description of the transformer, as well as a series of output experiments, it can be widely used in different power voltage level supply of consumer electronics.
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Yu, Fu-Kung, and 余富恭. "Implementation of an Active Clamp Flyback Converter." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/18992585177428643031.

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碩士<br>國立雲林科技大學<br>電機工程系碩士班<br>92<br>The high voltage stress of power semiconductors caused by the parasitic element of the transformer and the power switch in high frequency switching mode power supply when power switch is turn off . RCD clamped circuit is used to limit the switch voltage surge. However, the energy stored in the transformer leakage inductance will be dissipated in the clamp resister. It will reduce the efficiency of converter. In this paper an active clamp circuit technology is used to reduce the peak voltage stress across the power switch. The transformer leakage inductance a
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Que, Bai-song, and 闕百淞. "Active-Clamp Flyback Converter with Synchronous Rectification." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/79054355945786810516.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>101<br>This thesis focuses on the study and implementation of an active-clamp flyback converter, and compare it to a conventional flyback converter. The active-clamp flyback converter uses a capacitor to absorb the leakage inductor energy of the transformer and eliminate the voltage spike when the switch is turned off. Also the zero-voltage switching is achieved by the resonant tank to raise the conversion efficiency. The discussed active-clamp flyback converter is operated under CCM at light load. Therefore, the synchronous rectification is easier to fulfill. The op
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Yeh, Soung-Poul, and 葉松柏. "Flyback Converter with Current Ripple Reduction (FYRR)." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/30280155530000096555.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>98<br>Flyback converter with current ripple reduction (FYRR) is proposed and investigated in this thesis. The input current ripple reduction is achieved by utilizing the clamp capacitor and the leakage inductances of the transformer. Therefore, the EMI noise caused by the pulsating input current waveform can be reduced. Moreover, the EMI noise level can be further reduced by utilizing the clamp capacitor and the leakage inductance of the transformer as an embedded notch filter. To further improve the efficiency of the FYRR by utilizing a high-voltage switch cel
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Chao, Kuang-Yuen, and 趙光遠. "Study of flyback converter with Uninterruptible Feature." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/45833999362176697419.

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碩士<br>國立臺灣海洋大學<br>電機工程學系<br>96<br>The purpose of this thesis cites a dc to dc converter with uninterruptible which consists of flyback converter and a buck battery charger. Battery charger and main power uses a transformer to isolate, and it can uses different agist winding to adjust the voltage.It uses IsSpice simulation to verify this result.
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Chen, Ming-Ren, and 陳明仁. "Interleaved Flyback Converter with Zero-Voltage-Transition." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/62814697601088122192.

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碩士<br>國立東華大學<br>電機工程學系<br>97<br>This paper proposes a novel interleaved flyback converter which is composed of two parallel-operated basic flyback converters in addition to an auxiliary inductor and two snubber circuits. This circuit is able to transfer higher power at a much higher efficiency than conventional flyback converters. There are two efficiency boosting features in this proposed circuit. First, both the active power switches are zero- voltage-switched and therefore the switching losses are reduced. Second, the reverse recovery losss on the rectifying diodes are reduced. This is beca
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Ku, Chia-Lun, and 古家綸. "Two-Transformer Active-Clamping Forward-Flyback Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/72789421884909062453.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>103<br>This thesis presents a two-transformer active-clamping forward-flyback converter. The proposed topology is mainly composed of two active-clamping counterparts, but only two switches are required, the cost of the converter are thus reduced. In addition, two switches work on zero-voltage-switching(ZVS) operation such that the converter efficiency is improved. The merits of the proposed topology is that it can separate the volume of the transformer by utilizing two transformers. It is easy to achieve high power density. The operating principles and design conside
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Wooding, Gareth. "Mitigation of EMI in a flyback converter." Thesis, 2013. http://hdl.handle.net/10210/8690.

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M.Ing. (Electrical & Electronic Engineering Science)<br>This study investigates the mitigation of conducted electromagnetic interference (EMI) in a flyback DC-DC converter. Without the use of filters, the maximum mitigation of EMI possible without significantly decreasing converter operating efficiency is investigated. The following parameters are found to influence EMI: · Switching speed: Decreasing switching speed (increasing rise and fall times of the MOSFET) effectively reduces both common mode (CM) and differential mode (DM) EMI above a certain frequency. Series gate resistors up to a cer
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Chen, Yu-Fang, and 陳郁方. "Cascode Flyback Converter used on Photovoltaic Module." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/73929944795621855452.

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碩士<br>國立成功大學<br>電機工程學系專班<br>95<br>The purpose of this study to design the cascode flyback DC/DC converter is to increase efficiency in power conversion. It is also applied on Maximum Power Point Tracking (MPPT) of photovoltaic to get stable DC power. This study focuses on the least capacity of hardware circuit to produce DC/DC converter, as well as the use of Renesas's M16C series MCU (M30262F4) to control, detect voltage and output current of photovoltaic. The perturbation and observeation method is applied for MPPT, producing 80 kHz PWM signal to control power transistor of cascode flyback D
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Chiang, Cheng-Han, and 江承翰. "Implementation of Flyback Converter for LED Lighting." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/47239750490493598068.

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碩士<br>國立雲林科技大學<br>電機工程系碩士班<br>101<br>ABSTRACT Light-Emitting Diodes (LEDs) are no longer confined to use in commercial signage and now moved firmly, and with unquestioned advantages, into the field of commercial and domestic lightning. However, about 20~22% of electric energy in the world is used for lighting. At present, flyback converter has been widely used because of its relative simplicity and excellent performance in power converters. In this thesis, flyback converter operated in discontinuous conduction mode (DCM) is adopted as an off- line LED driver for applications. This LED driver i
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CHOU, KUAN-CHIN, and 周冠志. "Design of Flyback Converter Using Taguchi Method." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/84z74q.

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碩士<br>建國科技大學<br>電機工程系暨研究所<br>107<br>This thesis proposes a Taguchi’s orthogonal arrays concept of which the efficiency of the flyback converter can be effectively improved by using a simple orthogonal array experimental design as well as a simplified factor response analysis and referring to small quantity of experimental statistics for further analysis. We expect to use the optimal parameter combination obtained by Taguchi Method for enhancing the efficiency of the flyback converter. That is, the Taguchi Method can be used to help us to understand the effects of the design factors including t
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Shih, An-Ti, and 石安迪. "Mixed-Equalization Circuit Using Bi-Directional Flyback Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/49212776296773655614.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>104<br>In this thesis a mixed-equalization circuit for series-connected battery packs is proposed, which applies a bi-directional flyback converter to balance six battery packs. The four cells inside each battery pack are balanced by passive balance method. Each side of the flyback converter is connected with three battery packs. The energy is transferred directly from the highest battery pack to the lowest one through the converter. This proposed scheme aims to reduce the power dissipation during the multiple transfer processes and the time required for balancing.
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Chen, Jia-ming, and 陳加明. "Magnetic Amplifier Voltage Regulation Technique for Flyback Converter." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/d6hq74.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>94<br>In the power supply system, multi-output is always one of the basic requirement for the user. In earlier times, it did not request all the outputs of a power supply system with an excellent voltage regulation in the application. Basically one of the outputs is chosen as feedback control for stabilizing the system. As for the other outputs, their output voltages were obtained by varying the transformer turns ratio. This kind of power system design is only used for the application which doesn’t request highly accurate voltage regulation. For improving the vol
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Hu, Chia-Chien, and 胡家傑. "Flyback Converter For Light Emitting Diode Driver Circuit." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/734np8.

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碩士<br>崑山科技大學<br>電機工程研究所<br>97<br>High power white light emitting diode (LED) has attracted a lot of attention from both industry and academia for its high efficacy, simple to drive, environmentally friendly, and long lifespan. It becomes possible applications to replace the incandescent bulbs and fluorescent lamps in residential, industry and commercial lighting. The realization of this new lighting source requires both tight LED voltage regulation and high power factor as well. This thesis proposed a flyback converter for the LED lighting applications and input power factor correction. A PI c
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Chung, Ching-Hsian, and 張景軒. "100W Flyback/Forward Converter Realization and Experiment Analysis." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/32664940073891611224.

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碩士<br>國立交通大學<br>機械工程學系<br>98<br>This article proposes how to realize 100W flyback and forward converter from mathematical theory, design components to accomplish the products. And then we are going to analysis some experimental results, likes power efficiency, dynamic load characteristics, etc. Chapter 1, we would introduce the basic operation principle of the isolated switched-mode power supplies (flyback and forward converter), and its corresponding circuit’s state and mathematical models. Chapter 2, we are going to introduce how to design the converter’s passive components and to chose a pr
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CHU, HUA-HUANG, and 朱華煌. "The Strategy of Electromagnetic Interference for Flyback Converter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/11502212319053753573.

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碩士<br>逢甲大學<br>資訊電機工程碩士在職專班<br>98<br>The main purpose of this thesis is to design a Flyback power converter by using a new type of PWM IC. Since the way to solve the issue of EMI is complicated and tedious, it is a great challenge to design the electronic instruments and electronic communication device. Due to the highly developed technology of semiconductor, the new type PWM IC possesses a jitter frequency technique. Comparing with the traditional methods such as the insertion of noise-filter, the jitter frequency technique solves problem directly from the noise source. In other words, by disp
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Huang, Shun-Liang, and 黃順良. "High Power Factor Flyback Converter for LED Lighting." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/60035782630559120896.

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碩士<br>國立雲林科技大學<br>電機工程系碩士班<br>97<br>This thesis presents the Flyback converter with power factor correction (PFC) for light emitter diode (LED). The stricter requirements for harmonic regulations are necessary around the world in the recent years. More and more academics determined themselves on the study of PFC which is well connected with technology and all electronic appliances. The circuit structure in the thesis is suitable to low power applications by using Flyback converter due to its simple structure and low cost. LED is very important for the oncoming lighting system and LCD screen.
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Tsui, Cheng-Wen, and 崔正文. "Valley-Detection Technique for Quasi-Resonance Flyback Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/00623798584041392852.

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碩士<br>大同大學<br>電機工程學系(所)<br>103<br>In this thesis, a valley detection technique applied for quasi-resonant flyback converter is proposed, which not only can set a reasonable switching timing according to various loading conditions, but also improve the switching losses resulted from the increased switching frequency at light load. Comparing with the traditional hard-switching under current mode control has better conversion efficiency. In addition, a quasi-resonant flyback converter is implemented by using the proposed valley detection technique, whose specifications including output power of 2
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Tsai, Hsing-Wei, and 蔡幸葦. "A Quasi-Resonant Flyback Converter with Synchronous Rectification." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/72851151292138833184.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>103<br>The purpose of this thesis is to study and realize an auxiliary power which is based on quasi-resonant flyback topology for industrial usage. In order to promote the overall efficiency, synchronous rectification method is applied at the secondary side. Different from conventional flyback converters, the switching-on timing is controlled at when valley voltage occurs on the switching device. Not only the efficiency can be obviously improved, but also the temperature inside the machine can be lower. The leakage inductance of the transformer and the parasitic cap
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Chang, Shih-Ying, and 張仕穎. "Dual-output Flyback Converter for Photovoltaic Generation Application." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/44328126836215184099.

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碩士<br>國立彰化師範大學<br>電機工程學系<br>104<br>In this thesis, dual-output flyback converter for photovoltaic generation application is proposed to overcome the failure in complete use of solar energy issues of building-block photovoltaic system. This system including two modules, those are the double-output photovoltaic generation module and multilevel inverter module. The double-output photovoltaic generation modules can work in parallel-connected to provide a stable DC power source. In addition, the photovoltaic generation modules can also work in series-connected with a multilevel inverter module to p
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Lin, Wei-Shiang, and 林煒翔. "Flyback Converter for Low Power LED Lighting Applications." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/68674151606894577308.

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碩士<br>國立雲林科技大學<br>電機工程系碩士班<br>101<br>ABSTRACT This thesis presents a Flyback converter for lighting emitter diode (LED) applications. Instead of traditional light up circuit and Cold Cathode Fluorescent Lamp (CCFL), the LED is popular in lighting industry applications. Flyback converter with the low cost and simple structure is adopted to drive the LED lamp. The LED constant voltage and constant current loop are used to prevent the LED damage clue to the voltage and current variation. Finally, according to the analysis and design consideration in this paper, a convertor with P_o=12W, v_ac=85~2
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Wang, Wei-Ming, and 王暐鳴. "Design and Implementation of Active-Clamped Flyback Converter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/83u3x6.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>107<br>The purpose of this thesis is to present the operation principle of Active Clamp-Flyback converter. By the design rule in the content, we can make a circuit, and check the availability by simulation and experimental result. For the expectation of high frequency operation in the future, we use GaN device rather than using traditional Silicon device for all the switches in the circuit. Auxiliary switch and clamp capacitor in the circuit can recycle the energy in the leakage inductor of transformer. In this way, we can eliminate the voltage spike appear in the pr
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37

Yan, Yeong-Chang, and 顏永昌. "Systematic Analysis and Design of Dual-Switch Flyback Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/52495757111396327206.

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博士<br>國立臺灣科技大學<br>電子工程系<br>104<br>Like single-switch architecture, the dual-switch flyback converter also has the same characteristics, including simple circuit topology, low cost, electrical isolation and multiple outputs. Moreover, due to the dual-switch flyback converter providing an additional current return path, it will reduce the ring effect and enhance the circuit conversion efficiency, and it is suited to use for the low-voltage and low-cost power switches. Therefore, the dual-switch topology is also widely used. This dissertation presents the circuit analysis and design considera
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Lin, Po-Han, and 林柏翰. "Matrix Style DPWM LED Driver with Flyback Buck Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/84684305402986584586.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>105<br>In recent years, light-emitting diode (LED) has been widely applied to various circuits, such as liquid-crystal display, lighting, backlight source of large scanning boards display, etc. As LED application becomes more popular, it needs to be further adapted in order to better fit the market needs. For circuit simplification, chip area reduction and cost down, both the AC/DC controller and the LED driver will be designed. The supply voltages for LED strings and the corresponding driver are generated from the AC/DC converter with flyback control. Furthermore, t
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39

Cheng, Yu-nan, and 鄭玉南. "Study on the Snubber Circuits for a Flyback Converter." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/qtkztw.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>94<br>This thesis aims at the analysis of an active-clamping flyback converter. The comparisons between the active-clamping flyback converter and the conventional flyback converters adopting passive snubbers are made. The resonant tank of the active-clamping flyback converter consists of the leakage inductance of the transformer and the parasitic capacitance of the switch. The zero-voltage swtiching can be achieved by adequately design the circuit parameters. The conversion efficiency can thus be raised and the voltage spike on the switch can be reduced. Also the los
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Liau, Ching-bin, and 廖慶斌. "An Active-Clamping ZVS Flyback Converter with Integrated Transformer." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/97x3cc.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>102<br>Abstract This thesis studies an active-clamping flyback converter using a integrated transformer. The proposed converter is composed of two active-clamping flyback converter. load current between two secondaries can be equally shared so that the rectifier diode conduction loss can be reduced. Otherwise, the main switch of any converter serves as auxiliary switch for the other one, so that only two switches are required and both can achieve zero-voltage-switching (ZVS) operation. The transformers of converter are integrated into one magnetic core, therefor
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LIANG, CHI HO, and 梁期合. "Flyback PFC Converter with Low-Frequency Voltage Ripple Reduction." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/xgh9vy.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>102<br>This thesis studied two circuit topologies to reduce low-frequency output ripple voltage based on flyback power factor corrector (PFC). In the first topology, a reverse ripple voltage is produced by an Inverse-Buck convertor cascode at the output side to cancel the ripple. In the other topology, a bidirectional buck-boost converter is parallel-connected at the output to absorb/ supply power and thus reduce the ripple. Due to ripple reduction, small output capacitance can be used. Therefore, electrolytic capacitor is replaced by solid-state capacitor in the pro
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Liu, Tsung-Yen, and 劉宗延. "Burst Mode Circuit Design for Quasi Resonant Flyback Converter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/67858595527396548804.

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碩士<br>國立臺灣大學<br>電子工程學研究所<br>95<br>Reducing standby power of the power supply or converter is more and more important, because of emphasizing power management and energy conservation today. The burst mode circuit in this thesis is applied to the quasi-resonant mode flyback converter to reduce switching loss and conduction loss under very light load and no load. The burst mode circuit in this thesis is actually applied to green mode operation of the quasi-resonant mode flyback converter. The basic circuit architecture is from the relaxation oscillator. The manufacturing technology of the bur
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Huang, Guan-Rong, and 黃冠榮. "An Improved Over-load Protection Method in Flyback Converter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/27128808903668998323.

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碩士<br>國立彰化師範大學<br>電機工程學系<br>102<br>The traditional Flyback converter nature is a constant power output, If the output load reaches a limit point, the output voltage would descend and output current would ascend until the output voltage drop to zero, then the output current will be infinite that will cause burning problem. The proposed technology is using variable level for the reference by means of the over-load trigger point. If the circuit is normal operating the trigger point would be fixed, but on the contrary the circuit is abnormal operating the trigger point would be descended by red
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TWU, JHANG-YI, and 涂正誼. "Low Input Current Ripple Asymmetrical Half Bridge Flyback Converter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/24607791252339196510.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>102<br>Asymmetrical half-bridge flyback converter (AHB-flyback) is attractive because of its simplicity of secondary side configuration, and low voltage stress. It can achieve high efficiency by using soft switching techniques, such as the zero-voltage switching (ZVS) of primary power switches and the zero-current switching (ZCS) of output rectifiers. These characteristics make it suitable for high frequency and high input voltage power conversion applications. However, this converter has pulsating input current resulting in generating high di/dt noise. To reduce the
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Wei, Sian-You, and 魏先佑. "Multiple Winding Bidirectional Flyback Converter Used in Solar System." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/46719411036852548035.

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碩士<br>國立雲林科技大學<br>電機工程系碩士班<br>99<br>This thesis presented a multiple-winding bidirectional flyback converter which is used in the solar power system. In the preceding stage of the system, it was a bidirectional flyback charge/discharge circuit combined with the maximum-power-point tracking circuit of the solar energy. In the succeeding stage, it was the multilevel inverter system. The two stages were integrated to complete the overall system frame. The multiple-winding bidirectional flyback charge/discharge circuit is combined with the maximum-power-point tracking circuit of the solar energy.
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46

Lin, Chih-Hsien, and 林志賢. "The Analysis, Simulation and Implementation of a Flyback Converter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/49598186404029474500.

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碩士<br>逢甲大學<br>資訊電機工程碩士在職專班<br>98<br>Nowadays, the switch power converters have been broadly applied to the areas of computer peripheral, communication equipments, network devices, medical instruments, industrial products and home appliance. Due to the highly developments of the power semiconductors and microcontrollers, the compact, light weight and high efficient electronic devices is the goal of most of the manufactares to persuit and it is no exception for the tendency of power converter development. The fundamental of switching power converters will firstly be analyzed and designed in this
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47

Huang, Chien-Ming, and 黃建銘. "Valley-Fill Filter Flyback Converter with Variable Frequency Control." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/11874433101784943322.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>91<br>The conventional diode-capacitor rectifier is used in front end of electronic equipment to provide the dc bus voltage source. The input current contains high current harmonics and causes several problems such as low power factor, voltage distortion, and electromagnetic interference. The valley-fill filter functions as a passive power factor corrector but large ripple voltage will be presented in the dc bus. Usually, a postregulator is used to supply a regulated dc source for the load, but large low-frequency voltage ripple still exist in the load. This thesi
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48

Lin, Zi-Sheng, and 林子勝. "The Study of Solar Energy Half-Bridge Flyback Converter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/42448598511299391006.

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碩士<br>國立勤益科技大學<br>電子工程系<br>102<br>The thesis aims at design of solar converters, and it makes use of PWM to conduct control of output voltage and electric current. In chip, it adopts HT66F40 of Holtek and TL494 to control signal. With modulation of signal, it sets required frequency and duty cycle, and it integrates dual signal with half-bridge electric circuits to improve bearing load wattage of the output terminal. Dual signal carries on control of signal by one crystal conduction with one crystal cutoff to upgrade output bearing load wattage. It integrates half-bridge electric circuits with
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Lin, Hui-Chang, and 林輝菖. "High Efficiency Quasi-Fixed-Frequency Quasi-Resonant Flyback Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/62019999127108828186.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>103<br>Conventionally, Quasi-Resonant (QR) flyback converter is required to turn on the active switch when the first voltage valley is detected. Therefore, the advantages of soft-switching can be achieved. However, for light-load output and high-voltage input, the duty cycle would be very small, and magnetizing current is also small. After the switch is turned off, the switch voltage could resonate to valley in very short time; therefore, the switch should be turned on again. The increased switching frequency results in higher switching loss and impairs the efficienc
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Lin, Kuan-Yu, and 林冠宇. "Analog Compensator Design for aMulti-Mode Controlled Flyback Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/32482836451879765434.

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碩士<br>國立臺灣大學<br>電機工程學研究所<br>103<br>Flyback converter configuration has been a popular choice for many power electronic applications for many years. Recently, a so-called multi-mode control (MMC) scheme has been reported to improve the overall performances for applications requiring wide line voltage and wide load range such as the computer power systems. The idea of MMC is to provide different control strategies according to the load level. When the load is heavy, quasi-resonant (QR) control mode is used. When the load is reduced, a discontinuous conduction mode (DCM) is used. When the load is
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