有源功率因數校正技術Ⅲ-單相反激PFC變換器

摘要：前文已介紹單相、三相DCM及CCM boot PFC整流器的原理、控制及瞬態建模方法。本文介紹單相DCM及CCM反激PFC變換器的原理與控制。單相boost和反激PFC變換器運行于DCM時的固有特點是：當占空比為常數時，輸入電流接近正弦。 敘詞：反激PFC變換器 連續工作模式 不連續工作模式 D控制的無損電阻 Abstract：The principle,control and the transient modeling of the single and three phase boost PFC rectifiers operating in both DCM and CCM are described in the previous papers.The principle and control of the single phase flyback PFC converters operating in both DCM and CCM will be presented in this paper.The inherent property of both the single phase boost and flyback PFC converters,operating in DCM is to draw a sinusoidal-like current,if the duty cycle during a line period is held relatively constant. Keyword：flyback PFC converter CCM DCM D-contrlled loss free resistor