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이현관(H.K. Lee),공영수(Y.S. Kong),김은수(E.S. Kim),조정구(J.G. Cho) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
For transferring the primary power to the secondary one, the high frequency series resonant converter has been widely used for the contactless power supply system. However, the high frequency series resonant converter has the disadvantages such as the low efficiency, the high voltage gain characteristics and deviation of the phase angle in the overall load range. To improve this disadvantage, In this paper, the characteristics of the high efficiency and unit voltage gain as well as inphase are revealed in the proposed three-level LCLC ( Inductor - Capacitor - Inductor - Capacitor)resonant converter. The results are verified on the simulation based on the theoretical analysis and the 4kW experimental prototype.
3레벨 직렬 공진 컨버터를 적용한 비접촉 전원 효율 분석
이현관(H.K Lee),공영수(Y.S Kong),김은수(E.S Kim),조정구(J.G Cho),김윤호(Y.H Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
Comparing with the conventional transformer without the air gap, a contact-less transformer with the large air-gap (4.8㎝) between the long primary winding and the secondary winding has the increased leakage inductance and the reduced magnetizing inductance. By the increased leakage inductance and the reduced magnetizing inductance on the primary of the contact-less transformer, a good deal of the primary current circulates through magnetizing inductance, which results in a massive loss in contact-less power supply (CPS). In this paper, the efficiency characteristics of the contact-less power supply using a series resonant converter is analyzed and simulated.
단상 역율개선형 Single-Stage AC/DC Forword Converter
김태진(T.J.Kim),김은수(E.S.Kim),조정구(J.G.Cho),변영복(Y.B.Byun),조기연(K.Y.Joe) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
기존의 역률보상회로가 별도의 전력변화단을 가지고 있어 소자수가 많아지고 복잡한 하드웨어 구성을 가지고 있는 단점이 있다. 본 논문에서는 별도의 전력변환단을 가지지 않고 PFC기능을 가지는 단일 전력단(Single-Stage) 단상 AC/DC Forward Converter에 대하여 실험하여 검증하였다.
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.
유동욱(D.W.Yoo),정창용(C.Y.Jeong),백주원(J.W.Baek),조정구(J.G.Cho),조기연(K.Y.Cho),김학성(H.S.Kim),원충연(C.Y.Won) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
A precision high voltage generator for ion injection is implemented on HFZVS-PSCI (Phase-Shift-Controlled Inverter). Some practical aspects of implementing precision high voltage generator with HFZVS-PSCI, such an a HFHV transformer, multiflier, and precision CR divider are fast dynamic response, low ripple voltage, and high accuracy.<br/> <br/>