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소프트 스위칭 Single Stage AC/DC Full Bridge Boost 컨버터
김은수(E. S. Kim),조기연(K. Y. Joe),김윤호(Y. H. Kim),조용현(Y. H. Cho),박경수(G. S. Park),안호균(H. G. An),박순구(S.G.Park) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
A new soft switching single stage AC-DC full bridge boost converter with unit input power factor and isolated output is presented in this paper Due to the use of a non-dissipative snubber on the primary side, a single stage high-power factor isolated full bridge boost converter has a significant reduction of switching losses in the main switching devices, The non-dissipative snubber adopted in this study consists of a snubber capacitor Cr. a snubber inductor Lr, a fast recovery snubber diode Dr, and a commutation diode Dr, This paper presents the complete operating prin챠ples, theoretical analysis and experimental results.
허신,경진호,송달호,김정수,조용현,Hur, S.,Kyung, J.H.,Song, D.H.,Kim, J.S.,Cho, Y.H. 한국철도학회 2002 한국철도학회논문집 Vol.5 No.1
In this study, we have developed the static and dynamic simulation program of a high speed current collection system. The catenary wire is modeled to discrete masses connected by massless strings and the pantograph is replaced with 3 d.o.f equivalent models that are composed of masses, springs and dampers. We derived partial differential equations of motion from the equivalent model and developed the simulation program. Then, we calculated the static equilibrium state of the overhead catenary and the dynamic behaviors of the high speed current collection system. The analysis results were compared with the results of GASENDO software developed at RTRI in Japan.
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.
허신(S. Hur),경진호(J. H. Kyung),송달호(D. H. Song),김정수(J. S. Kim),조용현(Y. H. Cho) 한국철도학회 2002 철도저널 Vol.5 No.1
In this study, we have developed the static and dynamic simulation program of a high speed current collection system. The catenary wire is modeled to discrete masses connected by massless strings and the pantograph is replaced with 3 d.o.f equivalent models that are composed of masses, springs and dampers. We derived partial differential equations of motion from the equivalent model and developed the simulation program. Then, we calculated the static equilibrium state of the overhead catenary and the dynamic behaviors of the high speed current collection system. The analysis results were compared with the results of GASENDO software developed at RTRI in Japan.