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Output Power Characteristics of Isolated Secondary-Resonant SAB DC-DC Converter for Output Voltage Variation

The Secondary-Resonant Single Active Bridge (SR-SAB) converter is proposed as a high power, low-cost, compact, and high-efficiency DC-DC converter. The SR-SAB converter is composed of the H-bridge circuit, the high-frequency transformer, and the diode rectifier circuit with resonant capacitors connected in parallel. When primary H-bridge circuit switches, the resonant capacitors cause LC resonance. Due to LC resonance, the secondary diode rectifier circuit switching is delayed and the secondary voltage is lags behind the primary voltage like the DAB converter. While LC resonance occurs, large voltage is applied to leakage inductance and secondary current increase significantly. Therefore, the SR-SAB converter achieves high total power factor like DAB converter with simple SAB converter circuit. This paper presents the output power characteristics of the SR-SAB converter for the output voltage variation. The effectiveness of output power characteristics for output voltage variation of the SR-SAB converter is verified by experiments.