• Title/Summary/Keyword: Quasi-Resonant Converter(QRC)

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Integrated Boost-Flyback ZCS Quasi-Resonant Power Factor Preregulator (부스트-플라이백 결합형 ZCS Quasi-Resonant 역률개선 컨버터)

  • 이준영;문건우;김현수;윤명중
    • The Transactions of the Korean Institute of Power Electronics
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    • v.4 no.1
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    • pp.91-98
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    • 1999
  • An integrated ZCS quasi-resonant converter(QRC) for the power factor correction with a single switch is presented in this paper. The power factor correction can be achieved by the discontinuous conduction mode(DCM) operation of the input current. The proposed converter gives the good power factor, low line current harmonics, and tight output regulation. The input current waveform of the prototype designed using design equations shows about 15% of total harmonic distortion at rated condition. Also, the efficiency and power factor can be obtained about 86% and 0.985, respectively, at rated condition. The proposed converter is suitable for a low power level converter with a tightly regulated low output voltage and switching frequency of more than several hundreds kHz.

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Soft recovery PWM Quasi-Resonance Converter With a Folding Snubber Network (접히는 특성을 가진 스너버 망으로 소프트하게 복귀하는 의사 펄스 폭 변조 컨버터)

  • Jeong, Jin-Guk
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.47 no.2
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    • pp.50-54
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    • 2010
  • Soft recovery (SR) quasi-resonant converter (QRC) including a Folding snubber network (FSN) is introduced. It is obtained by combining normal quasi-resonant converter with folding snubber network of which the surrounding components are composed of passive devices only (diodes and capacitors). The reverse recovery loss of the main rectifier diode is eliminated by this method utilizing quasi resonance with Folding snubber network. By realizing soft switching condition, the proposed converter has PWM capability with high efficiency and is suitable for high output current and high power DC to DC converter application.

Single-Stage Single-Phase Integrated ZCS Quasi-Resonant Power Factor Preregulator Based on Forward Topology (단일 전력단 단상 공진형 영전류 스위칭 역률 개선 회로)

  • 구관본;이준영;윤명중
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.639-642
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    • 1999
  • An integrated zero current switching(ZCS) quasi-resonant converter(QRC) for power factor correction and high efficiency with single switch is proposed in this thesis. Boost integrated circuit operating discontinuous conduction mode(DCM) and QRC are used for power factor correction and reducing switching loss, respectively. A prototype converter has been designed and experimented. At rated condition, the THD in the input current waveform of this prototype has approximately 18%. The efficiency is obtained about 70%, the power factor is about 0.985 as well. Therefore, the proposed converter is suitable for a low power level converter with operating switching frequency above several hundred KHz.

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An Integrated Single-Stage Zero Current Switched Quasi-Resonant Power Factor Correction Converter with Active Clamp Circuit (능동 클램프 회로를 적용한 단상 ZCS 공진형 역률개선 컨버터)

  • 이준영;문건우;고관본;윤명중
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.626-630
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    • 1999
  • A new integrated single-stage zero current switched(ZCS) quasi-resonant converter (QRC) for the power factor correction(PFC) converter is introduced in this paper. The power factor correction can be achieved by the discontinuous conduction mode(DCM) operation of an input current. The proposed converter has the characteristics of the good power factor, low line current harmonics, and tight output regulation. Furthermore, the ringing effect due to the output capacitance of the main switch can be eliminated by use of active clamp circuit.

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A New Soft Recovery Quasi-Resonance Pulse Width Modulating Boost Converter with Multiple Order Folding Snubber Network (다중 폴딩 스너버 망에 의한 새로운 펄스 폭 변조 의사 공진형 컨버터)

  • 정진국
    • Journal of the Institute of Electronics Engineers of Korea TE
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    • v.37 no.3
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    • pp.66-71
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    • 2000
  • A new Soft Recovery Quasi-Resonant Converter (SR QRC) haying multiple order folding snubber network is proposed. It is combined with normal quasi-resonant converter with folding snubber network of which the surrounding components are composed of diodes and capacitors. The reverse recovery loss of main rectifier diode is eliminated by this method utilizing multiple resonance. The proposed converter has PWM capability with high efficiency and is suitable for high voltage and high power applications. By extension of this concept to other switching converters, a new family of SR PW QRC may be developed.

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An Integrated Single-Stage Zero Current Switched Quasi-Resonant Power Factor Correnction Converter with Active Clamp Circuit (능동 클램프 회로를 적용한 단상 ZCS 공진형 역률개선 컨버터)

  • 문건우;구관본;윤명중
    • The Transactions of the Korean Institute of Power Electronics
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    • v.4 no.6
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    • pp.539-546
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    • 1999
  • A new integrated single-stage zero current switched(ZCS) quasi resonant convertedQRC) for the IX)wer f factor correction(PFCl converter is introduced in this paper. The power factor correction can be achieved by t the discontinuous conduction mod$\varepsilon$(DCM) operation of an input current. The proposed converter has the c characteristics of the good IX)wer factor, 10씨 line current harmonics, and tight output regulation. Furthern10re, t the ringing effect due to the output capacitance of the main switch can be eliminated by use of‘ active clamp c circuit. Therefore, the proIX)sed converter is expecttc'(] to be suitable for a compact power converter with a t tightly regulated output voltage requiring a switching frequency of more than several hundrtc'(]s kHz.

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A Single-Stage Power Factor Correction Converter far $90-265V_{rms}$ Line Applications ($90-265V_{rms}$ 입력범위를 갖는 단일전력단 역률개선 컨버터)

  • 이준영;박희정;구관본;윤명중
    • The Transactions of the Korean Institute of Power Electronics
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    • v.5 no.5
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    • pp.508-514
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    • 2000
  • A single-stage power factor correction AC/DC converter with a simple link voltage suppressing circuit (LVSC) for the universal line application is proposed. Using this simple circuit, a low link voltage can be realized without deadbands at line zero-crossings. The proposed converter is analyzed and a prototype converter with 5V, 12A output is implemented to verify the performance. The experimental results show that the link voltage stress and efficiency are about 447V and 81%, respectively.

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A Study on Loss Analysis of ZVT-PWM Boost Converter using Quasi-Resonant Technique (유사공진 기술을 이용한 ZVT-PWM Boost 컨버터의 손실분석에 관한 연구)

  • 김정래;박경수;성원기;김춘삼
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.15 no.1
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    • pp.51-58
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    • 2001
  • Recently, DC-DC converters significantly increase the total losses as rising switching frequency. Trnditional soft switching technique for reducing switching losses even increase voltage/Clment stress of switch In this paper, Resonant circuit for soft switching is connected in parallel with power stage and only operates just before tum-on of the main sWItch. Therefore, ills doesn't affect the total circuit QI'||'&'||'pound;ration. The object of tIns paper is to make the linearized equivalent loss mxleIs. and to analyze the total losses by experiment. ZVT-PWlvI converter designed with 170-260[V] input, 400[V] 5[A] output, and 100[kHz] switching frequency is tested respectively with 500[W], 1[kW], 1.5[kW], and 2[kW] loads. The total losses in input 220[V], 2[kW] load are analyzed by usirm the linearized equivalent loss models.

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