Suppression of Voltage Spike in Resonant Switched Capacitor Converter Considering Parasitic Inductance
Liu Yan1, Yang Xiaofeng1, Yan Chengzhang1, Chen Qian2, Wen Piao1,3, Igarashi Seiki4
1. School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China; 2. Electric Power Research Institute State Grid Zhejiang Electric Power Co. Ltd Hangzhou 310014 China; 3. Key Laboratory of Optical Engineering Chinese Academy of Sciences Chengdu 610209 China; 4. Fuji Electric Co. Ltd Tokyo 141-0032 Japan
Abstract：The resonant switched capacitor converter (RSCC) based on silicon carbide (SiC) devices is suitable for high operation efficiency and power density due to its soft switching characteristics. However, the high operation frequency makes it sensitive to the parasitic inductance, which may cause the voltage spike of switching devices. By analyzing the RSCC laminated busbar model, the equivalent circuit with parasitic inductance was built. The influence of parasitic inductance on the operating mode of the circuit was studied, and the relationship between the parasitic inductance and the voltage spike of the switching devices was derived. Accordingly, this paper proposed two voltage spike suppression methods for optimizing the laminated busbar model and the snubber capacitance. Simulation and experimental results verified the effectiveness and feasibility of the voltage spike suppression methods in this paper.
2021, Vol. 36 
