An Efficient and Reliable Solid-State Circuit Breaker Based on Mixture Device

In this letter, a novel solid-state circuit breaker (SSCB) based on mixture device (MD-SSCB) is proposed for dc distribution systems. The proposed MD-SSCB can actively interrupt faults without introducing additional thyristor, charging power supply, and charging strategies. Besides, the interruption capability of the MD-SSCB is not affected by the parameters of the outer circuit. As a result, the MD-SSCB has advantages of compact structure, economic design, high efficiency, and high reliability. Moreover, the MD-SSCB can turn off its thyristors without reverse voltage stress, which eliminates the severe reverse overvoltage problem in the fault-interrupting process, and hence further enhances the reliability of the breaker. Detailed operation principle and design guidelines of the MD-SSCB are discussed through mathematical modeling. The feasibility of the proposed breaker is validated by experimental results.