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박성수(S.S.Park),공영수(Y.S.Kong),양승철(S.C.Yang),김은수(E.S.Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.11
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.
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
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