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Dissertations / Theses on the topic 'Flyback'

Author: Grafiati
Published: 4 June 2021
Last updated: 26 July 2025

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1

Sundkvist, Michael. "Laddning av kondensatorbank med flyback-omvandlare." Thesis, KTH, Elektrisk energiomvandling, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105817.

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Idag finns det flera olika topologier inom området AC-DC-omvandlare. Framför allt har flyback-omvandlaren blivit en populär topologi inom lågeffektapplikationer p.g.a. dess få komponenter och relativt enkla styrning som gör den kostnadseffektiv.I detta arbete har det undersökts vilka fördelar och nackdelar som finns med flybackomvandlaren för laddning av en kondensatorbank. Detta har utförts genom att bygga en prototyp som baseras på flyback-topologin och sedan jämföra prototypen med ett befintligt system som är baserad på en annan topologi. Jämförelsen tyngdpunkt låg på storlek,prestanda och
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2

Severi, Matteo. "Studio sui convertitori flyback multiuscita." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6503/.

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Questa tesi si propone di analizzare e comprendere il funzionamento del convertitore flyback, un circuito elettronico appartenente alla categoria dei convertitori DC/DC operanti in commutazione, avvalendosi anche dell’ausilio del software per la simulazione circuitale LTSPICE. Vengono dettagliatamente analizzati gli effetti delle disperse del trasformatore, valutato l'inserimento di snubber dissipativi, analizzato il comportamento dinamico del convertitore retroazionato, presa in considerazione la possibilità di inserire ulteriori uscite.
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3

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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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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5

Vakkuri, R. (Riku). "Flyback-tyyppisen DC-DC -muuttajan suunnittelu ja simulointi." Bachelor's thesis, University of Oulu, 2018. http://urn.fi/URN:NBN:fi:oulu-201803201371.

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Kandidaatintyöni tarkoituksena on suunnitella ja simuloida Flyback-tyyppinen DC-DC -muuttaja. Muuttajan tulojännite on Vin =12 V, jota on tarkoitus nostaa siten, että lähtöjännitteksi saadaan Vout =50 V ja lähtötehoksi Pout =100 W. Kandidaatintyössä tutustutaan hakkuriteholähteiden teoriaan, syvennytään tarkemmin Flyback-muuttajan toimintaan ja käydään sitten läpi muuttajan suunnitteluvaihe. Tämän jälkeen mitoitetaan komponentit oikeiksi ja tarkastellaan simuloinnin tulosta. Lopuksi esitellään lopputulosta ja sen toimintaa sekä tehdään aiheesta yhteenveto<br>The goal of this Bachelor’s thesis
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Paoloni, Eric. "Studio ed ottimizzazione di caricabatterie in configurazione flyback." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/4267/.

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Questa tesi tratta dell'ottimizzazione dei componenti di potenza di un convertitore flyback al fine di massimizzare l'efficienza di un caricabatteria per batterie al piombo. Le perdite vengono studiate all'interno di uno spazio di progetto che individua due variabili libere (rapporto spire e indice di ondulazione della corrente). Diverse mappe con le stime di dissipazione derivante da tutti i contributi, permettono l'individuazione del punto ottimo di progetto e consentono la corretta valutazione dei trade-off. Il risultato dell'analisi ha portato al progetto di un dimostratore in cui si è po
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7

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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8

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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9

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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10

Yaqoob, S. J., A. Obed, R. Zubo, et al. "Flyback photovoltaic micro-inverter with a low cost and simple digital-analog control scheme." MDPI, 2021. http://hdl.handle.net/10454/18583.

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Yes<br>The single-stage flyback Photovoltaic (PV) micro-inverter is considered as a simple and small in size topology but requires expensive digital microcontrollers such as Field-Programmable Gate Array (FPGA) or Digital Signal Processor (DSP) to increase the system efficiency, this would increase the cost of the overall system. To solve this problem, based on a single-stage flyback structure, this paper proposed a low cost and simple analog-digital control scheme. This control scheme is implemented using a low cost ATMega microcontroller built in the Arduino Uno board and some analog operati
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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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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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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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李建隆. "Single-Stage Flyback High Power." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/05152537872611059402.

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碩士<br>明新科技大學<br>電機工程研究所<br>98<br>This thesis focuses on researching and designing a single electrode, high power factor and constant current driver for LED lighting tubes. Its circuit framework is composed of flyback converter and controller with power factor connection. In this way, we could increase the capability of power efficiency and reduce the harmonics, make the power current and voltage have a power factor connection with zero path difference, and use the reference voltage and current test resistor inside IC to design its constant current source to drive LED lighting tubes. The charac
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Huang, Liang-Chieh, and 黃亮傑. "Flyback LED Driver Circuit Design." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/h334j5.

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碩士<br>國立虎尾科技大學<br>光電與材料科技研究所在職專班<br>101<br>The purpose of this thesis is focus on designing a driver and controller for LED Circuit. The main components are a flyback converter, PWM controller, and fine tuning regulator to drive the LED light. The key points are to drive the LED circuit by using the flyback converter, and to adjust the brightness of the LED light by changing the forward current of PWM controller output. Moreover, the method to design a driver to run LED circuit is the operational principle, analysis, and structure of design. Finally, in this thesis includes the collected da
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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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Hsieh, Ching-Hsing, and 謝慶星. "High Efficient Flyback Switching Power Supply." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/31178605042133343033.

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碩士<br>大同大學<br>電機工程學系(所)<br>93<br>This thesis presents the design and implement a high efficiency of low power consumption Flyback converter that designs Quasi-Resonant mode soft switching in discontinuous conduction mode (DCM). Discontinuous conduction mode transformer delivers the energy that uses inductor(L) and MOSFET’s Coss to generate resonant in MOSFET “ OFF ” status. That VDS will be reduced to low voltage (ZVS) (Even to 0V).The pulse width modulation (PWM) IC will sense the valley and turn on MOSFET in the lowest voltage valley point. This PWM IC (TEA1532) can use little components to
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Weng, Shang-Wen, and 翁尚文. "The Flyback Converters With Soft Switching." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/05285173235966870418.

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碩士<br>國立高雄應用科技大學<br>電機工程系碩士班<br>92<br>This thesis introduces two types of soft-switching circuits and applied to flyback converter. These two different types of the soft-switching are active clamp flyback converter and variable frequency flyback converter. The active clamp flyback converter needs two switching power transistors, external leakage inductance and isolating transformer. The variable frequency flyback converter does not need the former external components. Both of them use resonant circuits to achieve the soft-switching. This thesis not only describes the system circuit principle b
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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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Huang, Wei-Te, and 黃維德. "Realization of a Single-stage Flyback PFC and a Two-stage Boost-flyback Converter for LED Driver Applications." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/48424375983948043705.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>100<br>This thesis studies and implements two topologies for LED drivers with dimming control. The advantages of a well-known single-stage flyback power factor corrector (PFC) and a two-stage boost-flyback converter are introduced. Due to the high output current ripple of the single-stage flyback PFC, the two-stage boost-flyback converter, consisting a boost PFC and a flyback DC-to-DC converter, is adopted to achieve dimming and current sharing functions. The efficiency of the presented two-stage boost-flyback converter is improved. These two topologies are designed
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Ζαοσκούφης, Κωνσταντίνος. "Μελέτη και κατασκευή τροφοδοτικού με πολλαπλές εξόδους". Thesis, 2014. http://hdl.handle.net/10889/7926.

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Η παρούσα διπλωματική εργασία πραγματεύεται τη μελέτη και κατασκευή ενός τροφοδοτικού με πολλαπλές εξόδους. Η εργασία εκπονήθηκε στο εργαστήριο Ηλεκτρομηχανικής Μετατροπής Ενέργειας του Τμήματος Ηλεκτρολόγων Μηχανικών και Τεχνολογίας Υπολογιστών του Πανεπιστημίου Πατρών. Σκοπός της εργασίας αυτής είναι η μελέτη και η κατασκευή ενός τροφοδοτικού, το οποίο θα τροφοδοτείται από το μονοφασικό δίκτυο εναλλασσόμενη τάσης και θα έχει την δυνατότητα να τροφοδοτεί πέντε φορτία χαμηλής ισχύος με διαφορετικές συνεχείς τάσεις. Βασικό χαρακτηριστικό της κατασκευής αποτελεί η χρησιμοποίηση ολοκ
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Ruttanapaibooncharoen, Surin. "Improved efficiency in medium-power flyback converters." Thesis, 2003. http://hdl.handle.net/1957/30228.

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Switch-mode power supplies (SMPS's) not only convert energy, they also consume it. Typical operational efficiencies are approximately 25 to 60% for linear power supplies, and approximately 50-90% for switching power supplies. This means that products whose end-use electronics are dc, such as televisions and DVD players, could consume 50% less power when operating if the power supply were upgraded from 40% efficiency to 80% efficiency. Savings can occur not only from using SMPS's instead of linear power supplies, but also from specifying highly efficient switching power supplies. In many cases,
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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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Wu, Jhih-Hao, and 吳智豪. "Design and Implementation of a Flyback Inverter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/63987398901198681421.

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碩士<br>清雲科技大學<br>電機工程所<br>99<br>The thesis paper presents a low-power flyback inverter to be used as an AC module for a photovoltaic (PV) distributed generating system. This flyback inverter operates at discontinuous current conduction mode and thus the switching frequency is constant. As a result, the output filter can be designed more easily. Further analyses demonstrated that the performance of the output filter will affect the power factor of the injection current and leads to increase power loss. Finally, an 80W flyback inverter was built to verify the proposed the design performance. Som
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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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Su, Peng-Yu, and 蘇鵬宇. "Interleaved Flyback Converters with Zero-Voltage Switching." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/20305064192950453900.

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碩士<br>義守大學<br>電機工程學系<br>102<br>This thesis proposes a novel dc-to-dc converter that consists of two interleaved flyback converters with zero-voltage switching-on characteristic. Both flyback converters use power MOSFETs as the active switches. With no need to use any components for active-clamping circuit or snubber circuit, both active switches can operate at zero-voltage switching-on(ZVS) by freewheeling the converter current through the body diode of the MOSFET. The switching losses can be effectively reduced, thus improving the overall circuit efficiency. As compared with traditional fly
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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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Hwang, Xiang-Yu, and 黃翔宇. "Design and Implementation of Quasi-Resonant Flyback Converters." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/9hkhpr.

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碩士<br>景文科技大學<br>電腦與通訊研究所<br>100<br>This thesis presents an accurate resonant flyback converter control circuit, and the purpose is to make the quasi-resonant flyback converter operate boundary conduction mode. Boundary conduction mode boost PFC power transistor zero voltage turn-on. When conduction adopt flexible switching, the switching loss to zero, and the boost switch uses a zero voltage switching or valley switching. Thus, quasi-resonant flyback converter works efficiency than traditional hard-cut switch. In addition, the FAN6921 has a variable function of the PFC output voltage, and it m
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Guo, Ming-Hao, and 郭明豪. "Design and Implementation of Quasi-Resonant Flyback Converters." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/86859423554155514706.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>102<br>In tradition, the designing procedures in developing switch-mode power supplies are complicated and it will cause higher costs. The hard switching mode topologies are also leading to a serious electromagnetic interference and low conversion efficiency. In this thesis, the prototype electrical circuit has an AC/DC pre-regulator which is a boost power factor correction and is operated at boundary conduction mode in the front-end. It can reduce DC/DC conduction loss of power switch, decrease harmonic interference, and accomplish zero current turn-on. There is a D
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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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Wen_YuHuang and 黃文育. "Novel Interleaved Flyback Converters with Leakage Energy Recycling." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/47355360814281514726.

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碩士<br>國立成功大學<br>電機工程學系專班<br>98<br>In this thesis, a novel interleaved flyback converter combines the advantages of the two-switch flyback converter and the interleaved controlled technique. Thus, the output power can be increased and also the system efficiency is improved. There are two series capacitors in the front of input, and each capacitor is parallel with a basic flyback converter. Additionally, clamp diodes are employed to clamp the voltage stress on switches, and also recycle the energy stored in leakage inductors through clamp diodes. Several flyback topologies are introduced, and ch
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Chang, Che-Wei, and 張哲瑋. "Digital Primary-Side Sensing Control for Flyback Converters." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/48110071956387905120.

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碩士<br>國立交通大學<br>電控工程系所<br>98<br>This thesis presents the design and realization of primary-side sensing (PSS) technique for discontinuous-conduction-mode (DCM) DC-DC flyback converters or flyback rectifiers with power factor correction (PFC). PSS technique can be used for the output voltage or current regulation by employing an auxiliary winding. However, by analyzing the primary-side sensing error, the sensed voltage from the auxiliary winding may be corrupted by switching noise due to leakage inductance, winding resistance, and the voltage drop of the secondary diode, therefore the sensed vo
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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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