Characterization of 1200V 300A SiC MOSFET Switching Performance Dependence on Load-Cable -Output Filter and Control Deadtime Optimization

SiC MOSFET switching exhibits high dependence on load current, especially during switch-off. Higher dv/dt from SiC faster switching necessitates installation of output filter when long cables are used for inverter-motor connection. Both long cable and dv/dt filter introduce further deviation on switching performance. Impacts from varying load levels, long cable and output filter are investigated experimentally and compared with Si IGBTs performance in this paper. Among the variables, load current demonstrates dominant effect on turn-off time. Based on detailed characterization results, relationship between load current and turn-off time is derived for control deadtime optimization.