Seamless Transitions for DAB Converters Working In Multi Working Modes

A modulation scheme for dual active bridge (DAB) converter is proposed to achieve ZVS and reduce the conduction loss in this paper. A modulation scheme employing closed-loop control by integrating different working modes is proposed. Furthermore, the seamless transition among the different working modes can be achieved, so the modulation scheme is very suitable to be used for wide battery voltage and wide load requirements. The conduction loss and peak current by using the proposed modulation scheme are compared with those of the previous modulation schemes. Finally, a 1.2kW experimental prototype has been built to verify the effectiveness of the proposed converter and the modulation scheme.