Abstract
This letter presents a new fully soft-switched dc solid-state circuit breaker (SSCB). During dc current interruption, both main and auxiliary switches turn off under zero current switching (ZCS). A novel inductor-capacitor-capacitor (LCC)-based active injection circuit (AIC) is proposed. It eliminates transient power on switches with a fast operation, which enhances reliability. Experiments of a 350 V/90 A prototype validate ZCS operation for both switches. The response speed reaches 4 μs, and the maximum voltage on switches is 759V, which is within a safe range. This letter is accompanied by slides as multimedia material demonstrating major innovations and contributions.
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