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개선된 영전압ㆍ영전류 스위칭 3 레벨 DC/DC 컨버터
김은수(E.S. Kim),최선호(S.H. Choi),박성수(S.S. Park),박진영(J.Y. Park),양승철(S.C. Yang) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
The conventional three-level high frequency phase-shifted dc/dc converter has a disadvantage that a circulating current flows through transformer and switching devices during the freewheeling interval Due to this circulating current and RMS current stress, conduction losses of transformer and switching devices increases. To alleviate these problems, we propose an improved three-level Zero Voltage and Zero current Switching (ZVZCS) dc/dc converter using a tapped inductor, a snubber capacitor and two snubber diodes attached at the secondary side of transformer The proposed ZVZCS converter is verified on a 7 kW, 30kHz experimental prototype
탭-인덕터적용 무손실 스터버에의한 소프트스위칭 Buck 컨버터
김은수(E.S. Kim),박성수(S.S. Park),공영수(Y.S. Gong),최선호(S.H. Choi),강도현(D.H. Kang),조기연(K.Y. Joe),이진수(J.S. Lee) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
This paper presents an 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-off in the main power switch and freewheeling diode. The operating principle of the proposed Buck converter is described through the simulation, relevant equations and analysis
개선된 3 레벨 영전압 영전류 스위칭 DC/DC 컨버터
김은수(E.S.Kim),변영복(Y.B.Byun),김윤호(Y.H.Kim),조용현(Y.H.Cho) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
The conventional three-level high frequency phase-shifted dc/dc converter has a disadvantage that a circulating current flows through transformer and switching devices during the freewheeling interval.<br/> Due to this circulating current and RMS current stress, conduction losses of transformer and switching devices increases. To alleviate that problem, we propose an improved three-level Zero Voltage and Zero Current Switching (ZVZCS) dc/dc converter using a tapped inductor, a snubber capacitor and two snubber diodes attached at the secondary side of transformer. The proposed ZVZCS converter is verified on a 7 kW, 30kHz experimental prototype.
김은수(E S. Kim),최해영(H Y. Choi),조기연(K Y. Joe),김윤호(Y H. Kim) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
In this paper, an improved soft switching forward dc/dc converter is proposed. The proposed converter is constructed by using non-dissipate snubbers in parallel with the main switch and output diode of the conventional forward converter. Due to use of the non-dissipative snubbers, the proposed converter achieves zero-voltage switching for all switching devices and output diodes without switching losses. The complete operating principles and experimental results will be presented.<br/> <br/>
텝인덕터와 스너버 캐패시터를 이용한 영전압 영전류 스위칭 DC/DC 컨버터
김은수(E.S.Kim),변영복(Y.B.Byun),조기연(K.Y.Joe),김태진(T.J.Kim),김윤호(Y.H. Kim) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
The conventional three-level high frequency phase-shifted dc/dc converter has a disadvantage that a circulating current flows through transformer and switching devices during the freewheeling interval. Due to this circulating current and RMS current stress, conduction losses of transformer and switching devices increases. To alleviate these problems, we propose an improved three-level Zero Voltage and Zero Current Switching (ZVZCS) dc/dc converter using a tapped inductor, a snubber capacitor and two snubber diodes attached at the secondary side of transformer. The proposed ZVZCS converter is verified on a 10 kW, 30kHz experimental prototype.