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개선된 Clamp Circuit 적용 ZVZCS FB DC/DC 컨버터
김은수(Eun-Soo Kim),조기연(Kee-Yeon Joe),김윤호(Yoon-Ho Kim),이진수(Jin-Soo Lee) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
The conventional high frequency phase-shifted full bridge 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, RMS current stress, conduction losses of transformer and switching devices are increased, To alleviate this problem, this paper provides a circulating current free type high frequency soft switching phase-shifted full bridge (FB) dc/dc converter with the modified energy recovery snubber (ERS) attached at the secondary side of transformer,
구헌회(Heun-Hoi Koo),조기연(Kee-Yeon Joe) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
In this paper, soft switching high power factor buck converter is proposed, This converter is composed of diode rectifier, a input capacitor can be small enough to filter input current, buck converter with loss less snubber circuit. Converter IS operated in discontinous conduction mode, turn on of the switching device is a zero current switching(ZCS) and high power factor input is obtained. In addition, zero voltage switching (ZVS) at turn off is achieved and switching loss is reduced using loss less snubber circuit. The capacitor used in the snubber circuit raised output voltage, Therefore, proposed converter has higher output voltage and higher efficiency than conventional buck type converter at same duty factor in discontinous conduction mode operation.
3상 UPS 인버터의 출력전압 왜형률 개선을 위한 고조파 보상기법의 DSP 제어
변영복(Young-bok Byun),조기연(Kee-yeon Joe),박성준(Sung-jun Park),김철우(Cheul-u Kim) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
This paper presents real time digital signal processor(DSP) control of UPS system feeding nonlinear loads to provide sinusoidal inverter output voltage The control scheme is composed of an voltage compensator, the load current harmonics feed-forward loop for the cancellation of output voltage harmonics, and the output voltage harmonics feedback loop for system stability, The controller employs a Texas Instruments TMS320C40GFL50 DSP.