• 제목/요약/키워드: Freewheeling Diode

검색결과 24건 처리시간 0.02초

Modified Dual-Buck Inverter Based on Resonant Link

  • Chen, Rong;Zhang, Jia-Sheng;Liu, Wei
    • Journal of Power Electronics
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    • 제15권6호
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    • pp.1421-1428
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    • 2015
  • The efficiency and reliability of the dual-buck inverter (DBI) were greatly improved by eliminating the shoot-through problem and optimally designing the freewheeling diode. The traditional DBI suffers from large harmonic components with low output voltage and large capacity output filter inductor. To overcome the aforementioned disadvantages, a modified DBI (MBDI) was proposed by adopting a quasi-resonant link and pulse density modulation (PDM). This paper first introduces the working principle of the MBDI and PDM, and then the selection principle of system parameters is presented. Finally, a mathematical model of the MBDIis built, and an experiment prototype is set up. Simulation and experimental results verify the correctness of the theoretical analysis and the feasibility of the scheme.

Dual 컨버터로 동작하는 새로운 ZCS PWM Boost Converter (A New ZCS PWM Boost Converter with operating Dual Converter)

  • 김태우;진기호;김학성
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2002년도 전력전자학술대회 논문집
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    • pp.525-528
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    • 2002
  • A Novel Zero Current Switching(ZCS) Pulse Width Modulation(PWM) boost converter for reducing two rectifiers reverse recovery related losses Is proposed. The switches of the proposed converter are operating to work alternatively turn-on and turn-off with soft switching(ZVS, ZCS) condition. The reverse recovery related switching losses and EMI problems of the proposed converter eliminates the reverse recovery current of the freewheeling diode(D, Dl) by adding the resonant inductor Lr, in series with the switch S2. The voltage and current stresses of the components are similar to those in its conventional hard switching counterpats. As mentioned above, the characteristics are verified through experimental results.

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병렬 MOSFET 스위치를 이용한 ZCT PWM Boost Converter (A ZCT PWM Boost Converter using parallel MOSFET switch)

  • 김태우;허도길;김학성
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2002년도 전력전자학술대회 논문집
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    • pp.759-762
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    • 2002
  • A ZCT(Zero Current Transition) PWM(Pulse-Width-Modulation) boost converter using parallel MOSFET switch is proposed in this paper. The IGBT(main switch) of the proposed converter is always turned on with zero current switching and turned off with zero current/zero voltage switching. The MOSFET(auxiliary switch) is also operates with soft switching condition. In addtion to, the proposed converter eliminates the reverse recovery current of the freewheeling diode by adding the resonant inductor, Lr, in series with the main switch. Therefore, the turn on/turn off switching losses of switches are minimized and the conduction losses by using IGBT switch are reduced. In addition to, using parallel MOSFET switch overcomes the switching frequency limitation occurred by current tail. As mentioned above, the characteristics are verified through experimental results.

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탭-인덕터 적용 무손실 스너버에 의한 Buck 컨버터 (Buck converter using a non-dissipative snubber)

  • 박성수;공영수;양승철;김은수
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2003년도 추계학술대회 논문집
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    • pp.154-158
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    • 2003
  • This paper presents an improved soft switching buck converter using a non-dissipative snubber, which is composed of a tapped inductor, two snubber capacitors and three snubber diodes. The proposed buck converter achieves zero voltage turn-off in the main switch and freewheeling diode. The Proposed Soft Switching buck converter is verified through the simulation, relevant equations, analysis and experimental results.

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탭-인덕터적용 무손실 스너버에의한 소프트스위칭 Buck 컨버터 (Soft Switching Buck Converter Using Non-dissipative Snubber)

  • 김은수;박성수;공영수;최선호;강도현;조기연;이진수
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2002년도 추계학술대회 논문집
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    • pp.133-136
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    • 2002
  • This paper presents m improved soft switching Buck converter using an energy recovery snubber which is composed of a tapped inductor, two snubber capacitors and three snubber diodes. The proposed Buck converter achieves zero voltage turn-of in the main power switch md freewheeling diode. The operating Principle of the Proposed Buck converter is described through the simulation, relevant equation and analysis.

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전기자동차용 온보드 충전기를 위한 새로운 하이브리드 컨버터 (Novel Hybrid Converter for the On-Board Charger of Electric Vehicle)

  • Vu, Hai-Nam;Tran, Dai-Duong;Choi, Woojin
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2015년도 추계학술대회 논문집
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    • pp.52-53
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    • 2015
  • This paper introduces a novel hybrid converter combining a full-bridge soft switching converter and a full-bridge LLC converter. In this topology all the primary switches can achieve ZVS and ZCS all over the operation range. An additional switch and a diode are added in the secondary side of full-bridge converter to eliminate the circulating current and to provide a separate freewheeling path. The hybrid structure makes it possible to deliver the power to the secondary all the time of operation, thereby improving the efficiency. The proposed topology is suitable for the applications such as on-board chargers for electric vehicles and high power dc-dc converters. A 6.6-kW prototype converter was implemented and 97.5% efficiency was obtained through the experiments.

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연료전지 발전시스템에 적용된 고주파 절연형 ZVZCS PS-PWM DC-DC 컨버터의 설계 및 특성 해석 (The Characteristics Analysis and Design of High-Frequency Isolated Type ZVZCS PS-PWM DC-DC Converter with Fuel Cell Generation System)

  • 서기영;문상필;김동헌;이현우;권순걸
    • 조명전기설비학회논문지
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    • 제20권4호
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    • pp.21-28
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    • 2006
  • 본 논문에서는 Ballard사의 1.2[kW]급 연료전지와 연료전지의 저전압($28{\sim}43[VDC]$)을 승압(380([VDC])시키기 위한 풀-브리지 직류-직류 컨버터, 그리고 승압된 직류 링크전압을 교류 전압(220[VAC]), 60[Hz]으로 변환하기 위한 단상 풀-브리지 인버터로 구성된 연료전지 발전용 전력변환시스템 중 풀-브리지 고주파 절연형 영전압 영전류 스위칭 위상 천이 펄스폭 변조 직류-직류 컨버터를 제안하였다. 제안한 풀-브리지 고주파 절연형 영전압 영전류 스위칭 위상 천이 펄스폭 변조 직류-직류는 프리휠링 다이오드를 포함한 탭부 인덕터 필터를 이용하여 순환 전류를 저감시켰으며, 스위치 및 변압기의 턴-온, 턴-오프시에 오버슈트 전압이나 과도현상이 발생하지 않는다. 그리고 넓은 출력 전압 조정에도 효율을 $93{\sim}97[%]$정도 얻을 수 있으며, 출력 부하전류의 변화에 대해 거의 일정한 출력 전압 특성을 가졌다.

Performance Improvement of Isolated High Voltage Full Bridge Converter Using Voltage Doubler

  • Lee, Hee-Jun;Shin, Soo-Cheol;Hong, Seok-Jin;Hyun, Seung-Wook;Lee, Jung-Hyo;Won, Chung-Yuen
    • Journal of Electrical Engineering and Technology
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    • 제9권6호
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    • pp.2224-2236
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    • 2014
  • The performance of an isolated high voltage full bridge converter is improved using a voltage doubler. In a conventional high voltage full bridge converter, the diode of the transformer secondary voltage undergoes a voltage spike due to the leakage inductance of the transformer and the resonance occurring with the parasitic capacitance of the diode. In addition, in the phase shift control, conduction loss largely increases from the freewheeling mode because of the circulating current. The efficiency of the converter is thus reduced. However, in the proposed converter, the high voltage dual converter consists of a voltage doubler because the circulating current of the converter is reduced to increase efficiency. On the other hand, in the proposed converter, an input current is distributed when using parallel input / serial output and the output voltage can be doubled. However, the voltages in the 2 serial DC links might be unbalanced due to line impedance, passive and active components impedance, and sensor error. Considering these problems, DC injection is performed due to the complementary operations of half bridge inverters as well as the disadvantage of the unbalance in the DC link. Therefore, the serial output of the converter needs to control the balance of the algorithm. In this paper, the performance of the conventional converter is improved and a balance control algorithm is proposed for the proposed converter. Also, the system of the 1.5[kW] PCS is verified through an experiment examining the operation and stability.

TMS32OC31 DSP칩에 의해 제어되는 연료전지용 전력변환장치의 설계 (Design of fuel cell power conversion system controlled by TMS32OC31 DSP Chip)

  • 문상필;권순걸;서기영;김영문
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.351-354
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    • 2006
  • Recently, a fuel cell with low voltage and high current output characteristics is remarkable for new generation system It needs both a DC-DC step-up converter and DC-AC inverter to be used in fuel cell generation system Therefor, this paper, consists of an isolated DC -DC converter to boost the fuel cell voltage 380[$V_{DC}$] and a PWM inverter with LC filter to convent the DC voltage to single phase 220[$V_{AC}$]. Expressly, a tapped inductor filter with freewheeling diode is newly implemented in the output filter of the proposed high frequency isolated ZVZCS PWM DC-DC converter to suppress circulating current under the wide output voltage regulation range, thus to eliminate the switching and transformer turn-on/off over-short voltage or transient phenomena Besides the efficiency of 93-97[%]is obtained over the wide output voltage regulation ranges and load variations.

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도전손실 저감을 위한 새로운 소프트 스위칭 FB DC-DC 컨버터 (Novel soft switching FB DC-DC converter for reducing conduction losses)

  • 김은수;조기연;계문호;김윤호;윤병도
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1996년도 하계학술대회 논문집 A
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    • pp.388-391
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    • 1996
  • The conventional high frequency phase-shifted full bridge DC-DC converter has a disadavantage that a circulating current flows through transformer and switching devices during the freewheeling interval Due to this circulating current, RMS current stress, conduction losses of transformer and switching devices are increased. To alleviate this problem, this study provides a novel circulating current free type high frequency soft switching phase-shifted full bridge DC-DC converter which applies the energy recovery snubber(ERS) attached at the secondary side of transformer. The ERS adopted in this study is consisted of three fast recovery diode($Ds_1$, $Ds_2$, $Ds_3$), two resonant capacitor($Cs_1$, $Cs_2$) and a small resonant inductor [(Lr) : It can be ignored because the transformer leakage inductance(Ll) is able to use in stead of inserting the resonant inductor(Lr)]

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