Comparison of a single-phase and a three-phase dual active bridge with low-voltage, high-current output

In this paper, a comparison of a single-phase and a three-phase dual active bridge for electric vehicle application is presented. The converters are used to connect the traction battery stack with the 12V on-board power supply. The characteristic challenges are illustrated on the basis of an application with 2kW rated power. In total, three different design approaches are described and assessed using analytical considerations and simulation results. Finally, the conclusions are verified with measurements of two prototypes.