Advantages of Unidirectional Three-Phase Isolated Secondary-Resonant Single-Active-Bridge DC-DC Converter

This paper presents the advantages of a unidirectional three-phase isolated Secondary-Resonant Single-Active-Bridge (SR-SAB) DC-DC converter, wherein a resonant capacitor is connected in parallel to each diode of a three-phase Single- Active-Bridge (SAB) DC-DC converter. The SR-SAB converter can reduce the peak value of the transformer secondary voltage, allowing the use of switching devices with low breakdown voltage. This advantage of the SR-SAB converter is experimentally verified using a prototype with an output voltage of 250 V and output power of 3.3 kW.