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Single-Stage PFC AC/DC Full Bridge Converter의 소프트 스위칭에 관한 연구
임경내(Kyoung-Nae Lim),성병기(Beang-Gee Sung),계문호(Moon-Ho Kye),권순재(Soon-Jae Kwon),김철우(Cheul-U Kim) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
This paper proposes a new soft switching single stage AC/DC full bridge converter with unit power factor and isolated output. This circuit shows that it is possible to combine the boost converter which is for PFC(Power Factor Correction) and full bridge converter which is for DC/DC converter. A simple auxiliary circuit which includes neither lossy components nor active switches eliminates ringing of secondary side of the transformer. The characteristics of proposed circuit are investigated and the validity is verified by the simulation results.<br/> <br/>
DC-DC 컨버어터의 스위칭 素子 스트레스 抵減에 관한 硏究
계문호,윤태성 國立 昌原大學校 産業技術硏究所 1993 産技硏論文集 Vol.7 No.-
It is important to reset a transformer in order to reduce the voltage stress over the MOSFET switching device in high frequence DC-DC converter. three different reset methods-R-C-D CLAMP, ACTIVE CLAMP, ZVT-ACTIVE CLAMP- were studied theoretically. It was shown by computer simulation that an ACTIVE CLAMP method was the best one in terms of the lowest voltage stress over MOSFET. So the ACTIVE CLAMP method was selected and implemented, and the operational characteristics were examined experimentally. The experimental results were as good, especially at the voltage stress reduction over the main MOSFET, as simulation`s. These results will be applied to the power supplies in the fields of requiring the small size power supplies.