一種高效率的無橋Boost PFC拓撲的研究

摘要：在大功率應用時，傳統的Boost PFC電路的整流橋損耗成為整個開關電源的主要損耗之一。無需整流橋的新拓撲更具效率優勢。Dual Boost PFC（DBPFC）即為一種適用于大功率的無橋PFC拓撲。本文在與傳統Boost PFC對比的基礎上詳細分析了DBPFC的損耗情況，通過計算及實驗證明了DBPFC效率比傳統Boost PFC提高1個百分點左右，功率越大效率優勢越明顯。本文還對DBPFC的控制方法作了改進，減小了驅動損耗。 敘詞：雙Boost PFC；無橋PFC；功率因數矯正； Abstract：The conventional single switch boost topology is not suitable for higher power application because of its high rectify bridge losses. In order to improve the efficiency, many new topologies without rectify bridge have been proposed. Dual Boost PFC (DBPFC) is a kind of simple bridgeless boost PFC and easily to control. The losses of DBPFC are evaluated and compared with conventional boost PFC in this paper. And control strategy of DBPFC is studied and improved by reducing driver losses. Keyword：Dual Boost PFC；Bridgeless PFC；Power factor correction；