單級PFC變換器

摘要：為了滿足電網高質量供電要求，功率因數校正（PFC）變換器應用日益廣泛。大多數有源PFC變換器采用兩級變化器結構：PFC級和負載級。兩級結構有許多特點，如效率低、結構復雜、成本高等。消費電子產品中現已有不少200W以下的小功率有源PFC變換器采用單級結構，稱為單級PFC變換器，可以實現輸入電流整形和輸出電壓反饋控制。只用一個開關管和一個控制器的單級PFC變換器，稱為單級單管（S4）PFC變換器或S4輸入電流整形器。單級PFC變換器的性能（如THD，功率因數）不如有源PFC兩級變換器，但比無源PFC電路好。本文介紹幾種S4PFC變換器的結構、基本工作原理和主要性能。 敘詞：PFC變換器 兩級 單級 單級單管（S4） 輸入電流（波形）整形器 集成PFC整流器-調節器 Abstract：The most commonly used active PFC approach that meets high power quality requirements is a two-stage converter approach:PFC stage and load stage,which suffers from several drawbacks,such as low-power PFC converters(<200W)used in consumer electronics.The input current shaping and wide band-which voltage control are performed in a single stage converter.The single stage PFC converter implemented with only one switch is called as s4(single stage,single switch) PFC converter,or s4 ICS(input current shaper),which offers the performances (THD and power factor) better than the passive PFC approach,but not as good as that of the active two stage PFC converter.The circuit configulation,basicoperation principle and key characteristics of several s4PFC converters are presented in this paper. Keyword：PFC converter two-stage single stage single stage single switch(S4) input current shaper integrated PFC rectifier-controller