A New Hybrid Si/SiC CCM Totem Pole Bridgeless PFC Design Towards Optimal Performance and Cost Tradeoff

The continuous conduction mode (CCM) totem-pole bridgeless PFCs (TPBPFC) adopting the SiC devices can significantly improve the performance due to the smaller body diode reverse-recovery effect but suffer from significantly higher cost. This paper proposes a hybrid Si/SiC TPBPFC converter that downsizes the components cost by only employing a small-current SiC phase to process the fraction power at high-frequency, and the rest of the power is processed by the Si phase at an extremely low frequency. The mixed-used delivers the same high-frequency benefits as all-SiC design. A simple control strategy is provided to match the unique operation of those two phases with different frequencies and processed power. A 3. 3kW experimental platform of the Si IGBT /SiC MOSFET hybrid TPBPFC is set up and tested. Compared to the all-SiC design, the proposed hybrid design has been proved to achieve nearly the same efficiency performance, while offering a 21% device cost reduction and a twice effective converter spectrum to 160 kHz.