Design and Research of Soft-Tum -off- Based Solid-State DC Circuit Breakers with Ultra-Low Transient Overvoltage

Conventional solid-state circuit breakers (SSCBs) hardly do well in system complexity and performance at the same time in terms of overvoltage suppression, e.g., high clamping voltage and large volume. This paper presents a novel gate drive method for SSCBs based on soft turn-off that reduces transient overvoltage during the interruption without any additional snubber. Open-loop and closed-loop implementation are presented respectively. A method to predict the junction temperature rise is proposed. The effectiveness of proposed methods is verified in current interruption tests 270V system with a threshold at 180A.