基于SEPIC變換器的功率因數校正電路的參數設計與分析

摘要：本文介紹了一種基于SEPIC變換器的功率因數校正電路的工作原理，給出了輸入電流和二倍線頻紋波電壓的詳細推導過程，分析了占空比大小對于輸入電流畸變的影響，給出了主電路和電壓補償器的設計原則，基于此原則設計了一組電路參數。仿真證明了理論分析的正確性。 敘詞：SEPIC,THD,功率因數校正 Abstract：This paper introduces the operation principle of　a SEPIC-based power-factor-correction circuit. Detailed　derivation of input current and double-line frequency output voltage ripple are presented. The influence of cycle duty to THD of input current is analysed and design criteria for power stage and voltage compensator are also presented. Parameters of a SEPIC-PFC circuit based on these criteria are given.　The introduced theory analysises　and designs are verified by simulations. Keyword：SEPIC, THD, PFC