Dual active bridge with triple phase shift by obtaining soft switching in all operating range

This paper analyzes a DC-DC Dual Active Bridge (DAB) converter in order to obtain Zero Voltage Switching (ZVS) or Zero Current Switching (ZCS) in all the switches for any power range. This analysis shows the conditions that should be fulfilled to achieve ZVS and ZCS; also, it presents all the DAB switching modes that appear when a triple phase shift (TPS) modulation is used. Soft switching reduces the switching losses and so improves the efficiency. The analysis is validated with a 250W prototype.