In this paper

a wide input range DAB converter with integrated variable bus is proposed. Unlike traditional DAB converters

the converter proposed in this paper essentially integrates a four-switch Buck-Boost converter with the primary full bridge of a DAB converter to construct an integrated variable bus. By regulating the voltage of the variable bus

the voltage match can be realized over a wide range of input voltage. At the same time

the auxiliary inductor processes only a portion of the total power and operates in continuous conduction mode (CCM)

thereby reducing its loss and size. All switches are proven to achieve theoretical zero voltage switching (ZVS) operation over full load range. Besides

a hybrid pulse width modulation (PWM) and phase shift modulation (PSM) control strategy is proposed to achieve voltage matching control and regulate the power flow. Its working principle

working characteristics and parameter design principles are introduced in detail. Finally

a 1 kW laboratory prototype is built to verify the theoretical analysis.