Remedial Fault-Tolerant Operation of a Current-Tripler-Rectifier ZVS Three-Phase Full-Bridge DC/DC Converter

Current-tripler-rectifier ZVS three-phase full-bridge DC/DC converter (CTR-ZVS-FB converter) is a potential alternative for high-power applications due to its desirable characteristics of compact, efficient, high current capability, etc. In some cases, the failure of the power switch results in a converter shutdown and affects the reliability of the entire system. Therefore, this article presents a new remedial fault-tolerant operation for the CTR-ZVS-FB converter. During the remedial working mode, the inductor current, ZVS Soft-Switching Regions, and loss of duty cycle are analyzed. Moreover, this paper simulates the heavy loads of the converter under the remedial fault-tolerant operation. Results convincingly indicate that the proposed control is efficient and capable of running the system during the faults with a slight increase in the inductor current.