基于反激變換器的一種新型單級功率因數校正電路的研究

摘要：在單級功率因數校正變換器中，不能控制儲能電容電壓，而且電壓變化很大降低了電路的性能。本文提出了一種基于反激變換器的新型單相功率因數校正電路，電路只用一個有源開關就可以獲得輸出電壓的快速調節，儲能電容電壓被箝位、效率高。本文分析了電路的工作原理，討論了變壓器原邊電感對占空比及輸入電流諧波的影響，并且把該方法可以應用在其它拓撲中得出新的功率因數校正電路。 敘詞：功率因數校正(PFC) 反激變換器 不連續導電模式(DCM) Abstract：In single stage power factor correction converters, the voltage on the storage capacitor is not controlled, its wide voltage range has detrimental effect on the circuit performance. A novel single-stage power factor correction circuit based on flyback converter is presented in this paper,.A single active switch is used to achieve a fast-regulated-output voltage, the reservoir capacitor voltage is clamped and efficiency is high. The operating principle of circuit is analyzed; the influence of primary inductance on duty ratio and input current harmonic is discussed; this scheme is applied to other topologies to get new PFC circuits. Keyword：power factor correction flyback converter discontinuous conduction mode