Details semiconductor losses calculation of single phase dual active bridge converter for fast charger station application

Single phase dual active bridge (DAB) dc-dc converter is an ambitious candidate for the fast charger technology of the electrified vehicles. It has two dc-ac converter connected back to back through a bridge inductor isolated by a transformer. In particular, this paper presents the semiconductor loss calculation and the efficiency of the converter considering two different models and zero voltage switching (ZVS) switching. It also shows the optimal frequency range of 20 kHz to 70 kHz for the highest efficiency above 97% at different power level of operation between 124 - 35 kW. Finally, the study recommends a suitable cooling arrangement for the fast charger station to keep the junction temperature within the permissible limit. The simulation results confirm theoretical values.