Digitally Controlled Boost PFC Converters Operating with Large Scale Load Fluctuations  

作　　者：刘艳丽 王清龙 王宇翠 张烨 朱乐为 

机构地区：[1]School of Electrical Engineering and Automation,Tianjin University

出　　处：《Transactions of Tianjin University》2014年第4期292-298,共7页天津大学学报（英文版）

基　　金：Supported by the National Basic Research Program of China("973"Program,No.2009CB219700)

摘　　要：When boost power factor correction(PFC) circuit works with large scale load fluctuations, it is easy to cause a higher total harmonic distortion and a lower power factor because of traditional controllers and inductor current mode. To solve this problem, this paper proposes a PFC control system, which can operate with load fluctuations up to 1 000 W by using duty cycle feed-forward control theory to achieve smooth switching mode. The duty cycles in the next period of the control system are pre-estimated in the current cycle, which enhances the speeds of AD samplers and switching frequency, and reduces the cost and volume of the equipment to some extent. Introductions of system decoupling and feed-forward of input-voltage greatly improve the system performance. Both theoretical simulation and experimental results prove the advantage of the proposed scheme.When boost power factor correction （PFC） circuit works with large scale load fluctuations, it is easy to cause a higher total harmonic distortion and a lower power factor because of traditional controllers and inductor cur- rent mode. To solve this problem, this paper proposes a PFC control system, which can operate with load fluctuations up to 1 000 W by using duty cycle feed-forward control theory to achieve smooth switching mode. The duty cycles in the next period of the control system are pre-estimated in the current cycle, which enhances the speeds of AD samplers and switching frequency, and reduces the cost and volume of the equipment to some extent. Introductions of system decoupling and feed-forward of input-voltage greatly improve the system performance. Both theoretical simulation and experimental results prove the advantage of the proposed scheme.

关 键 词：power factor correction （PFC） large scale load fluctuation system decoupling FEED-FORWARD input voltage 

分 类 号：TM46[电气工程—电器]