Analysis of Hybrid SiC IGBT Based Resonant Switched Capacitor Converter with Circuit Parasitics Consideration

This paper proposed a hybrid SiC IGBT based resonant switched capacitor converter (HSiC-RSCC) to realize bidirectional DC/DC conversion in renewable energy applications. Featured in modular structure, HSiC-RSCC becomes suitable for high voltage conversion ratio applications. Different from conventional switched capacitor converter, small inductors were inserted to guarantee zero current switching (ZCS) for all the devices. Based on detailed analysis of operation principle, this paper discussed the effect of circuit parasitic resistance on static output performance and power losses. Besides, the device parasitic capacitance deteriorated soft-switching transitions. Followed by the analysis of parasitic capacitance defect, the switch pattern was further optimized to improve the transition process. Finally, experimental results have been provided to highlight the feasibility and effectiveness of this work.