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변영복(Y.B.Byun),구태근(T.G.Koo),김은수(E.S.Kim),조기연(K.Y.Joe),김동희(D.H.Kim),변동환(D.H.Byun) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
Most of the battery charger for electric powered forklift truck are controlled by the method of 3-phased constant current and constant voltage. However, these chargers have several disadvantages like a large charger capacity, and a short battery life time.<br/> This paper presents a digital type battery charger based on multi-mode control adding a constant power control and several assistant controls in the conventional control. The whole control system is performed by a low cost one-chip micro-controller and completely digitize. So we can get a high precision control and a good reliability.<br/>
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.
PAM 방식을 적용한 단상 승강압형 정류기의 디지탈제어
김태진(T.J.KIM),변영복(Y.B.Byun),조기연(K.Y.Joe),김철우(C.U.Kim) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
This paper describes a digital implementation of a pulse amplitude modulation(PAM) method for a unity-power-factor buck-booster converter. A digital controller is designed and implemented by a Digital Signal Processor(DSP) to replace the analog control circuit for PAM. Experimental results are presented and compared with simulations.<br/>
김태진(T.J.Kim),변영복(Y.B.Byun),조기연(K.J.Joe),조상명(S.M.Cho),김철우(C.U.Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
Joining thin aluminum alloy is difficult using most welding techniques Many of problems associated burn-through by the high heat input Common welding techniques are TIG, MIG, and MIG-PULSE welding The VP-GMA W provides more control of the heat balance m the welding arc by taking advantage of the different arc characteristics obtained with each of the two polarities.<br/> In this paper, we proposed new VP GMA Welding method by control DSP 320C32, and the characteristic and experiment result-voltage, current, welding bead, penentraion by this method are presented
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.