The improved dual active bridge converter with a modified phase shift and variable frequency control

This paper proposes a modified control scheme based on the dual active bridge converter with a center-tapped transformer. The tripe phase shift and fixed frequency (TPSFF) control is adopted to make sure that the soft-switching current of the switch bridge which is hardest to achieve soft switching is the fixed value at the light load. With the extended phase shift and variable frequency (EPSVF) control at the heavy load, not only the soft-switching current of the hardest switch bridge is the fixed value, but also the reactive power is restricted. And then, a 1.1kW experimental prototype is established to verify the correctness of theoretical analyses.