单级SEPIC功率因数校正电源的RCD箝位电路的损耗分析及比较

RCD Clamp Circuit Loss Analysis and Comparison in Single-Stage SEPIC PFC Power

本文介绍了一种新的单级PFC电路,采用SEPIC变换器实现单级PFC,RCD箝位电路吸收开关关断过程产生的电压尖峰。本文从理论上分析了PFC原理,推导了箝位电路设在两个不同位置时的损耗关系。实验结果表明该变换器可以得到很高的功率因数,两种位置的损耗差不多。

A new single-stage PFC circuit is introduced,SEPIC converter is used for PFC,RCD clamp circuit absorbs voltage peak brought by switch-off.This paper analyses theory of PFC,concludes clamp-circuit loss relation set in two different positions.It is by theory and experiment that we can achieve high power factor and loss set in two positions is approximately equal.