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무접점 변압기 적용 Full-bridge LLC 직렬 공진컨버터
공영수(Y.S. Kong),이현관(H.K. Lee),김은수(E.S. Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
Full-bridge LLC resonant converter using a contactless transformer for the photovoltaic power system is proposed. This converter has inherently several advantages such as zero voltage switching(ZVS) of the switches in the primary and zero current switching(ZCS) of the rectified diodes in the secondary without any auxiliary circuit. In this paper, the experimental results of the full-bridge LLC resonant converter using a contactless transformer are verified on the simulation based on the theoretical analysis and the 150W experimental prototype.
효율 개선을 위한 직ㆍ병렬 공진컨버터 적용 비접촉 전원
공영수(Y.S. Kong),이현관(H.K. Lee),김은수(E.S. Kim),조정구(J.G. Cho),김종무(J.M. Kim) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
To improve the efficiency characteristics in the resonant converter using the contact-less power supply with the large air-gap and the long primary winding, this paper suggests the three-level series-parallel resonant converter(SPRC). The voltage gain characteristics of the proposed converter have the unit gain in a resonance frequency point of the series and parallel, and input voltage and current in the primary of SPRC are always in phase for the all equivalent load resistance because of the parallel resonant tank of the high impedance. The results are verified on the simulation based on the theoretical analysis and the 4kW experimental prototype.
고집적 LLCT 평면 변압기 적용 Half-Bridge 직렬 공진컨버터
공영수(Y.S. Kong),이현관(H.K. Lee),김은수(E.S. Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
High density power supply has been researched over the last few years. To achieve high density power supply, the series resonant converter has been steadily applied. In this paper, the half-bridge series resonant converter using the integrated LLCT (Inductor-Inductor-Capacitor-Transformer) planar transformer is described. the structure of the high density LLCT planar transformer is analysed. as well as the experimental results are verified on the simulation based on the theoretical analysis and the 300W experimental prototype.
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.
고집적 스위칭 전원을 위한 LLCT 설계 및 Half-Bridge 직렬공진 컨버터
박진영(J.Y. Park),공영수(Y.S. Kong),김은수(E.S. Kim),이혜연(H.Y Lee) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
High density power supply technology has been researched over the last few years. In this paper, integrated LLCT(Inductor-Inductor-Capacitor-Transformer) structure is described for use in the half-bridge series resonant converter. The structure is analysed by means of FEMM(Finite Element Method Magnetics) and the experimental results of an LLCT structure for a 300W converter are presented.