Research on SiC-based Totem-pole Bridgeless PFC Converter and Control Strategy

Abstract

To address the problems of inrush current, high-frequency switching body diode loss and Boundary Conduction Mode (BCM) working condition loss in totem-pole Power Factor Correction (PFC) converter, an improved totem-pole bridgeless PFC converter is designed using SiC Schottky diode and SiC IGBT, which reduces the effects of inrush current and conduction loss while improving circuit efficiency. Based on the direct voltage feed-forward control principle, the converter control system is optimally designed to cut the harmonic interference caused by the current spikes at the over-zero moment and enhance the power quality. Simulation model of the improved totem-pole bridgeless PFC converter and its control system is built using Simulink. Experimental results demonstrate that the converter designed in this paper achieves high efficiency and high power quality under the action of the control system.