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本文以Ｂｏｏｓｔ型功率因数校正器（以后简写为ＰＦＣ）为例，提出三频分析法（即直流、低频、高频分析法），其主要贡献有：①给出了占空比的瞬态表达式；②采用求均值的数学处理，给出了直流分析法；③根据平均值状态方程，给出了低频（市电频率）分析法，并证明ＰＦＣ的功率因数（ＰＦ）的理想值为１；④根据电感电流的瞬态表达式，给出了高频（载波频率）分析法．本文所得的结论为ＰＦＣ电路提供了实用简捷的分析方法，并对设计、调试提供了理论依据．
In this paper, Boost-type power factor correction (hereinafter abbreviated as PFC), for example, proposed three-frequency analysis (ie, DC, low frequency, high frequency analysis), its main contributions are: ① given the transient expression of duty cycle (2) Adopting the arithmetic of averaging, the DC analysis method is given. (3) The low frequency (mains frequency) analysis method is given according to the average equation of state, and the ideal value of the power factor (PF) of PFC is 1 ; According to the transient expression of the inductor current, gives a high frequency (carrier frequency) analysis. The conclusion obtained in this paper provides a practical and simple analysis method for PFC circuit and provides a theoretical basis for the design and debugging.