Bridgeless Three-Level Power Factor Correction Rectifier Using SiC MOSFETs with High Efficiency

This paper proposes a high efficient bridgeless single-phase three-level PFC rectifier using two SiC MOSFETs. The circuit configuration of the proposed rectifier consists of two legs which are T-type switching leg and diode leg. The proposed rectifier minimizes the overall conduction losses by eliminating the full-bridge diode rectifier and by replacing the outer switches of T-type leg with SiC MOSFETs. Also, the proposed rectifier with three voltage levels reduces the power losses, harmonic components, voltage ratings, and EMI. To regulate the input current and the output voltage, an effective multilevel control algorithm is also proposed. The control algorithm consists of a feed-forward nominal voltage compensator, an input current controller, and an output voltage controller. The feed-forward nominal voltage compensator lightens the burden of the input current controller that controls the input grid current, and the output voltage controller regulates the output voltage and balances the bottom and top dc-link voltages. Using a 1-kW prototype of the inverter, we have evaluated the performance of the model and proved its feasibility.