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Dissertations / Theses on the topic 'Active power factor correction'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Williams, David. "Active power decoupling for a boost power factor correction circuit." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59145.

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During AC-DC conversion, the ripple power at the input of the converter must be filtered from the output. This filtering can be easily done by placing a capacitor on the DC bus. For systems with power output of hundreds of Watts or more, this capacitor must be quite high to effectively perform the filtering, and in order to be cost effective, an aluminum electrolytic capacitor (Al e-caps) needs to be used. The lifespan of Al e-caps is notoriously short, so for long lifespan systems, their use is not advisable. Film capacitors have longer lifespans than Al e-caps but are more expensive on a co

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2

Xie, Manjing. "Digital Control for Power Factor Correction." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/34258.

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This thesis focuses on the study, implementation and improvement of a digital controller for a power factor correction (PFC) converter. The development of the telecommunications industry and the Internet demands reliable, cost-effective and intelligent power. Nowadays, the telecommunication power systems have output current of up to several kilo amperes, consisting of tens of modules. The high-end server system, which holds over 100 CPUs, consumes tens of kilowatts of power. For mission-critical applications, communication between modules and system controllers is critical for reliability. Inf

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3

Zhou, Chen. "Design and analysis of an active power factor correction circuit." Thesis, Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/53729.

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The design of an active-unity power factor correction circuit with variable-hysteresis control for off-line dc-to-dc switching power supplies is described. Design equations relating the boost inductor current ripple to the circuit components selection and circuit performance arc discussed. A computer-aided design program (CADO) is developed to give the optimal circuit components selection. A 500 watt, 300 volt experimental circuit is built to verify the simulation and analysis results. The control-to-output response of the power factor circuit is verified with the experimental results.

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4

Bianchi, Jeramie Seth. "Bridgeless Active Power Factor Correction Using a Current Fed Push Pull Converter." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/544.

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ABSTRACT Bridgeless Active Power Factor Correction Using a Current Fed Push Pull Converter Jeramie Seth Bianchi Switched Mode Power Supplies have become increasingly popular for efficient methods of delivering power to an assortment of electronic devices. This thesis proposes a method of using a current fed push pull converter to provide active power factor correction and rectification in a single stage. While most AC-DC converters utilize a bridge rectifier to convert AC-DC and then perform DC-DC conversion, the proposed circuit will utilize its output diodes to perform rectification, thus el

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5

陳卓雄。 and Chuk-hung Chan. "Design and evaluation of active power factor correction circuit operation in discontinuous inductor current mode." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31220344.

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6

Chan, Chuk-hung. "Design and evaluation of active power factor correction circuit operation in discontinuous inductor current mode /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2062315X.

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7

Wu, Kuiyuan. "Design and implementation of a boost active power factor corrector." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/5631.

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The input current harmonics of the rectifier are very harmful. Not only do they reduce the power factor of the AC-DC converter and cause a lot of electrical energy loss, but also damage other devices and pollute the line power system. Measures should be taken to reduce these harmonics. The commonly used method is to design an effective PFC circuit for the AC-DC converter. In this thesis, a Boost APFC circuit will be discussed in detail. This thesis presents a solution to design an appropriate APFC circuit with one Kilowatts output power and make this APFC circuit work satisfactorily from full

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8

Louganski, Konstantin. "Generalized Average-Current-Mode Control of Single-Phase AC-DC Boost Converters with Power Factor Correction." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/27331.

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The dissertation presents a generalized average-current-mode control technique (GACMC), which is an extension of the average-current-mode control (ACMC) for single-phase ac-dc boost converters with power factor correction (PFC). Traditional ACMC is generalized in a sense that it offers improved performance in the form of significant reduction of the current control loop bandwidth requirement for a given line frequency in unidirectional and bidirectional boost PFC converters, and additional functionality in the form of reactive power control capability in bidirectional converters. These feature

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9

Al-Bayaty, Hussein Kamal Anwer. "Novel methods of utilization, elimination, and description of the distortion power in electrical circuits." Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/10646.

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Firstly, this thesis investigates the electrical power harmonics in an attempt to utilize harmonic current and its distortion power in a novel idea to reconvert the distortion power into useful power. This is done, in order to feed different DC or AC loads in single and three-phase power system by using passive or active filters and accordingly, develop a new topology of hybrid active power filter (HAPF). In addition, this circuit can be considered as a power factor corrector (PFC) because it reduces the total harmonic distortion (THD) and improves the power factor (PF). Secondly, this thesis

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10

Kumar, Kundan. "High Efficiency Power Converters for Vehicular Applications." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424474.

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The use of power electronics in the electrical propulsion systems leads to the optimal and efficient utilization of the traction motors and the energy sources (batteries and/or fuel cells) through the recourse to suitable power converters and their proper control. Power electronics is also used for implementing the multiple conversions of the energy delivered by the sources to feed the various loads, most of them requiring different waveforms of voltage (ac or dc) and/or different levels of voltage. This work focuses on the solutions aimed at improving the efficiency of power converters for ve

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11

Unal, Teoman. "Design Of A Single-phase Full-bridge Diode Rectifier Power Factor Corrector Educational Test System." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12608148/index.pdf.

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In this thesis an educational test bench for studying the power quality attributes of the commonly used single-phase full-bridge diode rectifiers with power factor correction (PFC) circuits is designed and tested. This thesis covers the active and passive power factor correction methods for single-phase bridge rectifier. Passive filtering approach with dc side inductor and tuned filter along with active filtering approach via singleswitch boost converter is considered. Analysis, simulation, and design of a single phase rectifier and PFC circuits is followed by hardware implementation and tests

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12

Prasai, Anish. "Direct dynamic control of impedance for VAR and harmonic compensation." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42816.

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Reactive power is critical to reliable operation of the modern AC power system. There is a plethora of motor-loads, transformers, and power-electronic loads connected to the power grid, which consume reactive power for normal operation. Transmission lines also consume reactive power when they are loaded above their surge impedance loading (SIL). Reactive power can exact opportunity cost due to reduced capacity of the lines to carry real power, which in turn lowers revenue. Most transmission owners (TOs) levy large penalties against load serving entities (LSEs), industrial facilities, and o

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13

Eleyele, Abidemi Oluremilekun. "Isolated Single-Stage Interleave Resonant PFC Rectifier with Active and Novel Passive Output Ripple Cancellation Circuit." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-423117.

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With the increasing demand for fast, cheaper, and efficient power converters come the need for a single-stage power factor correction (PFC) converter. Various single-stage PFC converter proposed in the literature has the drawback of high DC bus voltage at the input side and together with the shift to wide bandgap switches like GaN drives the converter cost higher. However, an interleaved topology with high-frequency isolation was proposed in this research work due to the drastic reduction in the DC bus voltage and extremely low input current ripple thereby making the need for an EMI filter cir

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14

Soares, Guilherme Márcio. "Capacitance reduction in off-line led drivers by using active ripple compensation techniques." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/6044.

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Bernáth, František. "SW nadstavba analyzátoru sítí pro automatický návrh nn kompenzační jednotky na základě měření." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218704.

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Thesis is devoted to a problem of Power Factor Correction on the low voltage level. It has still its own difficulties despite the fact that topic moved through long development. The main goal of this work is to offer reader variable procedure considering design process. It is based on use of measured data of network analyzer Meg30. The design algorithm has to share a maximum of eventual influencing factors. Therefore the body of master thesis goes through detailed analysis of Power Factor Correction.

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16

Soares, Jurandir de Oliveira [UNESP]. "Controle digital através de dispositivo FPGA aplicado a um retificador trifásico híbrido operando com modulação por histerese variável." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/100310.

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Made available in DSpace on 2014-06-11T19:30:50Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-12-15Bitstream added on 2014-06-13T19:40:17Z : No. of bitstreams: 1 soares_jo_dr_ilha.pdf: 2703269 bytes, checksum: f51d4821a6cb2c9c52cf4d25420d0c39 (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>O objetivo deste trabalho é a concepção de uma lógica de controle digital com modulação por histerese variável usando um dispositivo programável FPGA (Field Programmable Gate Array) e linguagem de descrição de hardware VHDL (Hardware Description Language), aplicada

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17

Soares, Jurandir de Oliveira. "Controle digital através de dispositivo FPGA aplicado a um retificador trifásico híbrido operando com modulação por histerese variável /." Ilha Solteira : [s.n.], 2008. http://hdl.handle.net/11449/100310.

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Orientador: Carlos Alberto Canesin<br>Banca: Falcondes Jose Mendes de Seixas<br>Banca: Flávio Alessandro Serrão Gonçalves<br>Banca: Luiz Carlos de Freitas<br>Banca: João Batista Vieira Junior<br>Resumo: O objetivo deste trabalho é a concepção de uma lógica de controle digital com modulação por histerese variável usando um dispositivo programável FPGA (Field Programmable Gate Array) e linguagem de descrição de hardware VHDL (Hardware Description Language), aplicada em um retificador trifásico híbrido para a obtenção do Fator de Potência (FP) de entrada quase unitário. O Retificador Trifásico Hí

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18

Amarasinghe, Kanishka A. "Resonance mode power supplies with power factor correction." Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/23672.

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There is an increasing need for AC-DC converters to draw a pure sinusoidal current at near unity power factor from the AC mains. Most conventional power factor correcting systems employ PWM techniques to overcome the poor power factor being presented to the mains. However, the need for smaller and lighter power processing equipment has motivated the use of higher internal conversion frequencies in the past. In this context, resonant converters are becoming a viable alternative to the conventional PWM controlled power supplies. The thesis presents the implementation of active power factor corre

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19

Yeh, Thomas. "Analysis of power factor correction converters /." Online version of thesis, 1992. http://hdl.handle.net/1850/11220.

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20

Qian, Jinrong. "Advanced Single-Stage Power Factor Correction Techniques." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30773.

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Five new single-stage power factor correction (PFC) techniques are developed for single-phase applications. These converters are: Integrated single-stage PFC converters, voltage source charge pump power factor correction (VS-CPPFC) converters, current source CPPFC converters, combined voltage source current source (VSCS) CPPFC converters, and continuous input current (CIC) CPPFC converters. Integrated single-stage PFC converters are first developed, which combine the PFC converter with a DC/DC converter into a single-stage converter. DC bus voltage stress at light load for the single-stag

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21

Jiang, Yimin. "Development of advanced power factor correction techniques." Diss., Virginia Polytechnic Institute and State University, 1994. http://hdl.handle.net/10919/53609.

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Three novel power factor correction (PFC) techniques are developed for both single-phase and three-phase applications. These techniques have advantages over the conventional approaches with regard to the converter efficiency, power density, cost, and reliability for many applications. The single-phase parallel PFC (PPFC) technique was established. Different from the conventional two-cascade-stage scheme, the PPFC technique allows 68% of input power to go to the output through only one time high frequency power conversion, but still achieves both unity power factor and tight output regulation

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22

Niezrecki, Christopher. "Power factor correction and power consumption characterization of piezoelectric actuators." Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/42619.

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A piezoceramic actuator used for structural control behaves electrically as a nearly pure capacitance. When conventional amplifiers are used to drive these actuators, the current and voltage is close to 90 degrees out of phase. This causes the power factor (PF) of the load to be close to zero and results in excessive power requirements. This thesis reports the results of a study of the following question: What effect does applying power factor correction methods to piezoceramic actuators have on their power consumption characteristics? A subproblem we explored was to detennine the qualitative

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23

Jones, Kevin David. "Harmonic distortion correction using active power line conditioners." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA300873.

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24

Zhang, Jindong. "Advanced Integrated Single-Stage Power Factor Correction Techniques." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/26480.

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This dissertation presents the in-depth study and innovative solutions of the advanced integrated single-stage power-factor-correction (S2PFC) techniques, which target at the low- to medium-level power supplies, for wide range of applications, from power adapters and computers to various communication equipment. To limit the undesirable power converter input-current-harmonicâ s impact on the power line and other electronics equipment, stringent current harmonic regulations such as IEC 61000-3-2 have already been enforced. The S2PFC techniques have been proposed and intensively studied, in or

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25

Anand, Aniket. "Power factor correction in switched reluctance motor drives." Thesis, IIT Delhi, 2019. http://eprint.iitd.ac.in:80//handle/2074/8125.

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26

Chan, Weng Hong. "Harmonic reduction and power factor correction in low power supply system." Thesis, University of Macau, 2002. http://umaclib3.umac.mo/record=b1445817.

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27

Tan, Benjamin H. "A Novel Arc Welding Power Supply with Improved Power Factor Correction." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2199.

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This paper presents the design and development of a novel Arc Welding Power Supply utilizing a modified two-switch forward converter topology. The proposed design improves the power quality by improving power factor to near unity and reducing total harmonic distortion. State space analysis of the proposed circuit showed that the circuit followed a boost-buck input output relationship. Simulation of the circuit was first implemented in LTspice to verify the functionality of the new topology. Hardware implementation of the proposed design was built on a scaled-down prototype for a proof-of-conce

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28

Göker, Fuat, and Christoffer Hedberg. "Utvärdering av faskompenseringsmetoder för ett småskaligt vattenkraftverk : Genomgång av kondensatorbatteri, aktiv och passiv reglering, övermagnetiserad synkronmaskin, SVC och STATCOM på Fröslida kraftverk." Thesis, KTH, Hälsoinformatik och logistik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230165.

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Småskalig vattenkraft är en stor användare av reaktiv effekt då de ofta har asynkrongeneratorer. Det gör att det finns ett reellt behov för faskompensering, dels för att minska distorsion i nätet samt för att förbättra deras ekonomiska ställning, då elbolag ofta tar ut en avgift för överskridande användning av reaktiv effekt. Det ligger också i allmänhetens intresse att ha en god elkvalitet och hålla störningar och avbrott nere, vilket kan erhållas med faskompensering och filtrering av övertoner. Det finns olika tekniker för faskompensering med sina respektive för- och nackdelar som specificer

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29

Saasaa, Raed. "A single-stage interleaved resonant power factor correction converter." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59199.

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Applications requiring DC voltages vary widely, from low power, such as LED lighting, to high power, as in industrial motor drives and battery chargers. Accordingly, a unified power architecture for all applications is not practical for efficiency, size and cost optimization. The use of LED lighting system became popular due to its many advantages. The new outdoor applications such as street and flood lighting require high power (i.e. >200 W) in contrast to the low power existing LED drivers. Generally, the conventional architecture of AC/DC converters consists of two main stages; The first is

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30

George, Mark S. "Power factor correction using a boost quasi-resonant converter." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/41901.

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<p>A steady-state analysis of a quasi-resonant zero current boost converter is performed in its application to a single-phase power factor correction circuit. The known closed-form expressions are used to design the boost converter and the multiloop control circuit. The operating characteristics are simulated by using PSPICE and are experimentally verified. Considerations for a practical design are based upon hardware operating at a maximum of 1 megahertz, with a 115 VRMS input, 200 VDC and 100 watt output.</p><br>Master of Science

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31

Wu, Chen-chia, and 吳振嘉. "Study of Active Power-Factor Correction Controller Circuits." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/74243596431118058324.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>93<br>This thesis aims at investigating the technologies of the active power-factor correction (PFC) circuit. The system originally in the article is based on a boost converter circuit as the structure, the control method is to adopt the average current mode. We doesn’t only narrate the circuit principle of the systematic circuit in the article but also use the OrCAD PSpice A/D software to simulation. Finally, we implemented make a prototype circuit and verified the proposed method. The experimental result shows that it can reach the goal for the power-factor corre

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32

Jian, Chih-Yuan, and 簡志遠. "Fuzzy Logic Controller Design for Active Power Factor Correction." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/r4xsbx.

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碩士<br>國立臺北科技大學<br>電機工程系所<br>99<br>With the rapid development of electronics industry, the need for switching power converters has increased significantly. Therefore, increasing the energy efficiency of electronic products is a very important topic. Because the electrical equipment has nonlinear power components, it makes unnecessary power consumption. However, the purpose of power factor correction is to make the phase of input current in phase with the input voltage. Then the load will be equivalent to the pure resistive load, and the power only provides real power we need. Power factor corre

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Su, Hung-Hsien, and 蘇紘憲. "Develop DSP-Based Active Power Factor Correction Controller Circuits." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/98441139085616888594.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>95<br>The thesis aims to the research of active power factor correction (PFC) circuit and develop a DSP-based digital controller. In the thesis, PI controller is the control core for the voltage loop、and current loop, and then achieve the function of the power factor correction of boost converter. Finally, we develop a boost converter and connect it to a DSP-based controller to measure the waveforms and verify the power factor correction. Furthermore, the research can be extended to a simulating platform which we can verify the power factor correction by just chang

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Chen, Bing-Hao, and 陳炳豪. "Design of Shunt Semi-Active Power factor Correction Circuits." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/62190966925805688297.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>100<br>This study aims to design a Shunt Semi-Active Power Factor Correction Circuits , which can be applied to high power circuit by low switching frequency. The designed circuit can avoid power loss working with high switching frequency when using the method of active power factor correction .The experimental configuration based on DSP is applied to a compressor of air conditioner with varied load. The simulation check the developed circuit using Ispice . Both of the experimental and simulation results have guaranteed the derived configuration reach the expected

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Liu, Ming-Song, and 劉明松. "Improvement of Nonlinear Carrier Control ofSingle Active Power Factor Correction." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/7bhwqe.

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碩士<br>國立臺北科技大學<br>電機工程系所<br>94<br>Recently, power electronics have been widely used, thus causing a great number of harmonics to be injected into the grid and hence degrading the quality of the utility. Therefore, power factor correction has been employed to overcome this problem. There are two types of power factor correction, passive and active. The former has larger size than the latter, which is the reason why the active power correction is widely preferred and deeply investigated. In this paper, modification of the nonlinear carrier control of the single active power factor correction is

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Liu, Chih-Wen, and 劉誌文. "The Design and Implementation of a Two-Quadrant Active Clamp Forward Converter with Power-Factor-Correction Converter with Power-Factor-Correction." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/98688362522878433226.

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碩士<br>國立高雄應用科技大學<br>電機工程系<br>97<br>This thesis focuses on the analysis and design of a two-quadrant active clamp forward converter with active power factor correction. First, the characteristics of the power factor correction and conventional active clamp forward converter will be analyzed in this thesis, and then an improved two-quadrant active clamp forward converter topology is proposed. The topology will focus on solving the problems that when the main power switch of conventional active clamp forward converter is turned off, it will need to afford higher voltage stress, and that the zero

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Wang, Chia-Yi, and 王家毅. "Design of an Active Clamp Flyback Converter with Power Factor Correction." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/75338031814635495327.

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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 is mainly on AC/DC power converter with PFC characteristic. The power stage DC-DC based on the circuit structure flyback converter. And incorporation of an active-clamp circuitry into the flyback coverter serves to recycle transformer leakage energy while minimizing switch voltage stress. Imperfect switching is a major contributor to power loss in converter, switching devices absorb power when they turn on or off if they go through a transition when both voltage and current are nonzero. The methods of the active clamp circuit to achi

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Fang, Jia-Long, and 方嘉隆. "Design and Implementation of High Efficient Active Power Factor Correction Circuits." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/40735830723378581382.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>95<br>The thesis aims at investigating an active power factor correction circuit. In boost power converter, we ser up average large signal model with Matlab and derive control–output function for pole assignment of control loop with ac small signal model. In controller, control circuit of conventional active power factor correction and modified PI control circuit are adopted, separately. Through simulation results and experimental responses of hardware circuit show that under variation of load or alternating input voltage, modified PI control circuit has better reg

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Chen, Chun-Yu, and 陳俊佑. "UPS Forward Converter with Active-Clamp Technology and Power Factor Correction." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/22064632138434548595.

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碩士<br>國立臺灣海洋大學<br>電機工程學系<br>103<br>The research purpose of this thesis is based on the circuit structure of UPS forward converter, increasing the power factor correction function on the forward converter; the resulting output efficiency can be further enhanced. And utilize the auxiliary winding to attain battery charging. Added active-clamp technology for the forward converter architecture could achieve the functions of resets the transformer and voltage surge suppression, the energy consumed by the magnetic flux leakage feeds back to the main line, with the power factor correction circuit so

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Hou, Ming-Kai, and 侯銘凱. "Design and Implementation of Low Frequency Active Power Factor Correction Circuits." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/66433512264669310149.

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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>96<br>This thesis focuses on the analysis and design of low frequency active power factor correction circuits (LFAPFC). It has been recently reported that LFAPFC has attractive features such as low EMI and low switching loss when compared with high frequency active power factor correction circuits (HFAPFC). Moreover, its performance is better than that of passive power factor correction circuits (PPFC). However, studies on the major control parameters of LFAPFC and their corresponding performance are limited. This thesis proposes a design method that is based on a

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Hsieh, Chang-Yu, and 謝昌祐. "Design and Implementation of High Efficiency Active Power Factor Correction System." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/42482959426557158575.

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碩士<br>淡江大學<br>電機工程學系碩士班<br>95<br>In last years, the flourishing development of electronic industry fills with a lot of electronic products in our life. However, basic power components are indispensable equipment for maintain various electronic products. Since most demands rely mainly on AC to DC converter in these basic power equipments. The conversion efficiency is quite important to power equipments. The quality of assessing conversion efficiency is to regard power factor as main basis. In present industrial circle and academia has many research and relevant products to improvement power fac

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Huang, Yen-Chen, and 黃衍晨. "Analysis and Implemention of LED Driver with Active Power Factor Correction." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/70967138537992030638.

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碩士<br>國立中央大學<br>電機工程學系在職專班<br>101<br>This thesis is mainly developed and focused on a power converter for LED TV backlight lightening. Its feature is possessing active power factor and high efficiency AC-DC converter and constant current LED driver. The circuit architecture combines boost converter with LLC half bridge resonant converter and it works under the model of discontinuous conduction mode as well. Moreover, its secondary stage has constant current circuit which provides constant current for LED modules. Furthermore, the illumination can be adjusted by dimmer. An active PFC and operat

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Chan, Shun-Chieh, and 詹順傑. "Study and Implementation of Half Bridge Resonant Power Supply with Active Power Factor Correction." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/17612061686013051680.

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碩士<br>元智大學<br>電機工程學系<br>94<br>This thesis presents results of study and implementation of half bridge resonant power supply with active power factor correction. First, active power factor correction approach was discussed to rectify the wave form distortion of bridge current and realize high power factor, high efficiency and low current harmonics. Afterward, it gave a stable high quality dc power input for half bridge resonant power supply. Second, half bridge resonant power supply could achieve Zero Voltage Switching (ZVS) in the switching process to reduce power losses. When the variable fre

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Wang, Jin-Ming, and 王見銘. "An Active Power Factor Correction Technique for CUK Type AC to DC Converter." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/96238153615772072630.

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碩士<br>國立海洋大學<br>電子工程學系<br>83<br>In this paper, an active power factor correctioncircuit for CUK type ac-to-dc converter is proposed and analyzed. The conve- rter adopts a frond-end diode rectifier so that only one active switch is required. The converter draws sinusoidal ac current from the ac source with nearly unity input power factor while operting at a fixed switching frequency. Moreover, this paper shows that the active input power factor correction stage is also used to regulat

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Wang, Jian-Ming, and 王見銘. "An active power factor correction technique for CUK type AC to DC converter." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/17206103081059198219.

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Lin, Yu-Laing, and 林宥良. "Analysis and Implementation of Active Step-Down Power Factor Correction Half-Bridge Converter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/27416406935685434229.

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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>100<br>This thesis presents a step-down power factor corrector (PFC) for the universal AC/DC converter. The prototype of the adopted circuit is separated into two stages. In order to maintain high efficiency, we use step-down PFC (Vo=84V) instead of a traditional boost PFC (Vo=390V) to meet input harmonic standard IEC61000-3-2. Symmetrical half-bridge converter with center-tap full-wave rectifier at the secondary side is used to offer 100W (5V/20A) output power. In order to improve total efficiency of large output current, synchronized rectifiers (SR) are reduced

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Parng, Charng-Sheng, and 龐長生. "Development of An Active Power-Factor-Correction AC/DC Converters With Line Voltage Variation." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/29632846849494751548.

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碩士<br>國立交通大學<br>電機與控制工程系<br>88<br>This paper presents the design and implement of a single-phase power-factor correction ac-dc converter with high power factor,and fast output voltage dunamic response.In this paper,a sample and hold based ripple free input and output voltage sensing strategy is proposed,in order to improve converters output voltage dynamic response while obtained a higher quality waveform of input current.In addition,a mathematical model of the scheme is developed, and used to design a voltage compensator.To verify the operation and evaluate the performance of the proposed con

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Tseng, Kai-Hung, and 曾凱宏. "The Design and Implementation of Active Power Factor Correction onFull Bridge Phase Shift Converter." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/j9e6e4.

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碩士<br>中原大學<br>電機工程研究所<br>92<br>This paper presents the design, experimental results and analysis of an active power factor correction on full bride phase shift inverter, it gives a steady power, low harmonics and high power factor system. And the inverter achieves the Zero-Voltage Switching (ZVS) for reducing power lost. Finally, we could get the power system (include power factor correction) is better than one (include variable transformer) from experimental results, validate the feasibility of the implemented system in high power application.

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Hsu, Ting-Yi, and 許圢墿. "Study and Implementation of an Electrolytic Capacitor-Less Power LED driver with Active Power Factor Correction Feature." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/mp787f.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>99<br>The single-stage driver circuit is commonly used for low-power LED lighting applications. However, the use of electrolytic capacitors in the single-stage LED driver will seriously shorten the lifetime. This thesis aims to design and implement an electrolytic capacitor-less LED driver with active power factor correction (PFC). A two-stage LED driver which consists of a buck PFC converter and an isolated inverse-SEPIC converter is studied. The operating principles and design considerations of the two-stage circuits are analyzed and discussed. A 48W laboratory pro

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Hsu, Jen-Kai, and 徐振凱. "Study and Implementation of Half Bridge Resonant Power Supply with Synchronous Rectifier and Active Power Factor Correction." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/20657025426138551773.

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碩士<br>元智大學<br>電機工程學系<br>95<br>This thesis presents results of study and implementation of half bridge resonant power supply with active power factor correction. First, active power factor correction approach was discussed to rectify the wave form distortion of bridge current and realize high power factor and low current harmonic. Afterward, it gave a stable high quality dc voltage input for half bridge resonant power supply. Second, half bridge resonant power supply could achieve Zero Voltage Switching (ZVS) in the switching process to reduce power losses. When the fixed frequency control was

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