Transient behavior of the dual active bridge converter in high efficient energy conversion system

This paper shows the transient behavior of a system which boosts a part of the battery voltage for a electric vehicle. This system consists of the powertrain of electric vehicles and a bi-directional isolated DC-DC converter called dual active bridge (DAB). This system can compensate the battery voltage drops with high efficiency compared with the conventional series chopper system. In many studies, the DAB converter operates in the steady state. On the other hand, this paper analyzes the operation of the DAB converter in the transient state. Especially, the operation at the start of the DAB converter is focused on.