A Novel Dual Output Dual-Active-Bridge Converter with Output Voltage Balancing

In this paper, a novel dual output dual-active-bridge (DAB) converter with output voltage balancing is proposed. The proposed circuit is similar in structure with conventional DAB converter, but a balancing inductor is added in between the transformer secondary winding and midpoint of dual outputs to balance the two output voltages. As conventional DAB converter, it is operated with phase-shifted pulse-width-modulation control. Although a balancing inductor is added, it does not affect the operation mode significantly. Therefore, the proposed converter retains most of the characteristics of the conventional DAB converter. Although the proposed converter has slightly increased secondary switch current due to the balancing inductor, it achieves balanced output voltages without additional switching devices. A 2.7 kW prototype converter is built and tested to verify the performances of the proposed converter.