Application of CS-MCT in DC solid state circuit breaker (SSCB)

In this work, the application of cathode-short MOS-controlled thyristor (CS-MCT) in DC solid state circuit breakers (SSCB) is evaluated. Firstly, static and dynamic characteristics of CS-MCT are presented, and a low on-state resistance combined with a high surge current capability makes CS-MCT a promising candidate for SSCB. Furthermore, fault interruption process of SSCB based on CS-MCT is demonstrated via TCAD simulation as well as experiment. According to the research, SSCB based on CS-MCT can achieve a high fault current interruption capability once the mis-triggering of internal thyristor is effectively suppressed. And a contradictory relationship between energy loss and interruption capability of the SSCB is also found, which implies a trade-off design should be taken into consideration.