An Improved Hybrid Si/SiC CCM Totem-Pole Bridgeless PFC Rectifier With Active Power Decoupling

The continuous conduction mode (CCM) totem-pole bridgeless power factor correction (TPBPFC) converters are feasible because of the better reverse-recovery performance of the wide band gap (WBG) devices. However, practical applications encounter challenges such as low power density, high cost, and high-power loss. This paper proposes an improved hybrid Si/SiC CCM TPBPFC rectifier. A buck-type active power decoupling (APD) circuit is used to remove the bulky capacitor and increase the power density. A SiC-based bidirectional switch is connected between the Si-based PFC and APD bridges to achieve the soft switching of Si-based switches and decrease the power losses. The operation principle is given and then the analysis of soft switching conditions and power loss are provided. Finally, the verification of proposed circuit is experimented on a 500 W prototype and a 2% efficiency improvement is demonstrated.