Improving the Power Density of the ZVS-SVM Controlled Three-Phase Boost PFC Converter

The compound active clamping three-phase boost rectifier proposed by authors has a clamp branch composed of an active switch, a resonant inductor and a clamping capacitor. With a novel zero voltage switching space vector modulation (ZVS-SVM) method, the rectifier can realize ZVS operation for all switching devices and effectively suppress the reverse recovery process of the bridge leg switch anti-parallel diode. In addition, both the main switches and the auxiliary switch have the same and fixed switching frequency. In this paper, the soft switching condition of the ZVS-SVM controlled three-phase boost PFC is analyzed. The relationship between the switching loss of the converter and the circuit resonant parameters is studied. The EMI noise between hard switching and soft switching converter is also investigated. The results are verified by a 20 kW prototype.