A Hybrid PWM Pattern of Three Phase Buck PFC Converter with Low Common Mode Voltage and Low Voltage Stress

Three-phase Buck PFC converter with high-frequency and high-power density faces the problems of high common-mode (CM) voltage and high voltage stress on switching devices. In this letter, the influence of different PWM patterns on CM voltage and voltage stress is studied, and the high-frequency current paths in the three-phase Buck PFC converter considering parasitic parameters is revealed. A hybrid PWM pattern is proposed to reduce the CM voltage and voltage stress on switching devices. An experimental prototype 200kHz switching frequency is built to verify the analysis results in this letter.