A Hybrid Si/SiC CCM Interleaved Totem-Pole Bridgeless PFC Converter with Coupled-Inductor and Hybrid-Frequency Interleaving Operation

In this paper, a hybrid Si/SiC continuous conduction mode (CCM) interleaved totem-pole bridgeless PFC converter is proposed, which is consists of a small-capacity highfrequency SiC phase and a large-capacity low-frequency Si phase, instead of two identical SiC phases in conventional design. Thus, it has a lower total cost compared to the all-SiC interleaved TPBPFC converter. Meanwhile, a coupled inductor is applied to simplify the structure and further reduce the cost of magnetic components. A new hybrid-frequency interleaving technique is developed to coordinate the Si and SiC phase operations and offer an improved tradeoff between cost and performance. Furthermore, a master-slave control structure, which combines the average current mode control (ACMC) and modulated model predictive control (MMPC), is proposed to implement the proposed hybrid-frequency unique technique. A 3kW prototype has been built to verify the effectiveness and advantages of the proposed TPBPFC converter and control strategy.