Research on Main Circuit Topology for a Novel DC Solid-state Circuit Breaker

Concerning the problems of topologies in current patents, the improvements to the structure of solid-state circuit breakers are made to enhance the reliability and to broaden the field of application and to reduce the manufacturing costs. A novel circuit breaker topology is proposed in this paper, which is improved by using the current-commutation of hybrid circuit breakers for reference. By making use of soft-switching and current-commutation forced by resonance, the new topology can not only successfully realize the soft turn-on and fast turn-off but also can be applied in the situation of higher voltage level. The topology is presented and mathematical model is built by mode analysis. Finally, the normal turn-on and turn-off experiment was taken on a prototype. The experimental results show the feasibility of the proposed topology and verify the correctness of theoretical derivations.