Short-Circuit Fault Detection and Remedial in Full-Bridge Rectifier of Series Resonant DC-DC Converter Based on Inductor Voltage Signature

Abstract

This paper proposes a method to detect the short-circuit fault (SCF) in the full-bridge diode rectifier at the output side of the series resonant dc-dc converter (SRC). The full-bridge inverter is employed at the input side. The utilized diagnostic/signature signal to detect the SCF is the voltage of the resonant inductor, which increases after fault occurrence. Also, sensing the inductor voltage is an easy way through inserting a few turns into the core of the resonant inductor without affecting its operation. The sensed inductor voltage is compared with a threshold voltage, which is calculated based on the converter parameters. After the identification of the SCF fault, the input-side bridge is reconfigured into a half-bridge structure to recover the normal operation of the converter because the output side is operating as a voltage doubler in this case. Since in the proposed method, localization of the exact faulty diode is not considered important in the further operation, fast recovery of the fault condition can be achieved. The simulation results provided show the feasibility of the detection algorithm and the remedial action at different operating conditions.