A digital control algorithm for single-phase boost PFC converter with fast dynamic response

Abstract

A novel digital control algorithm for a single-phase boost power factor correction (PFC) converter with fast dynamic response is presented. Based on the converter circuit structure, the track of the output voltage and the inductor current of next switching cycle is estimated in advance. The self-adjusting voltage control loop is adopted to improve the static and dynamic voltage regulation. Meanwhile, the current control loop is implemented only by the estimated output voltage and inductor current values, which simplifies the control loop and reduces the digital calculation burden. The single-phase boost PFC converter with the proposed digital control algorithm has been implemented via the field programmable gate array (FPGA). Experimental results indicate that the proposed control algorithm can improve the power factor, as well as the dynamic response of boost PFC converter simultaneously. The power factor is optimized more than 0.98, and the recovery time is less than 4 line cycles with small overshoot.