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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),이현관(H.K Lee),송정민(J.M Song),김병수(B.S Kim),차인수(I.S Cha) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
An 8㎾ L-Type boost dc/dc converter using a non-dissipative snubber is presented. L-Type boost converter is used to increase low input voltage (24VDC) to the isolated high output voltage (250VDC) and is selected because of its low switch counts, low conduction loss, simple transformer structure with low turns ratio and easy operation. In addition, due to the use of a non-dissipative snubber on the primary side, a L-Type boost converter has a significant reduction of switching losses in the main switching devices. he complete operating principles, analysis and experimental results in this paper are described.
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.
김은수(E.S Kim),윤광호(G.H Yoon),강성인(S.I Kang),차인수(I.S Cha) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
Recently, new technologies of the PCS (Power Conditioning System) for energy generating using solar cells or fuel cell are required for smaller unit with low cost and high performance. In this paper, the proposed high frequency AC linked DC/AC converter which consisted of LLC resonant and LF cycloconverter is presented, described and verified through the experimental results of 1㎾ PCS.
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
김은수(E.S. Kim),구대현(D.H. Goo),김종무(J.M. Kim),강도현(D.H. kang),신병철(B.C. Shin),공영수(Y.S. Kong),양승철(S.C. Yang) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
A contact-less power supply system (CPS) allows electrical energy to supply to mobile consumers without any electrical or mechanical contact. CPS works in the same principle as a transformer, With the track litz cable forming the primary circuit and the pickup as the secondary The track power supply generates the high frequency altemating current in the track cable The captured AC magnetic field generated by the track conductors produces electrical energy m the pickup coil and the pickup rectifier converts the high frequency AC power to DC while regulating the power to the load. This paper presents the theoretical analysis, simulation and experimental results of the series-parallel resonant converter working as contact-less power supply system