Abstract：In order to optimize the current stress of dual active bridge（DAB）converter，an improved dual

phase shift（IDPS）modulation was proposed based on the traditional dual phase shift（DPS）modulation. Firstly，

the working principle of IDPS modulation was introduced，its steady-state working characteristics were analyzed，

and the mathematical model of current stress on transmission power was established. Then，the optimal value of

current stress of IDPS modulation was obtained by using Lagrange multiplier method，and compared with

traditional single phase shift（SPS）and DPS modulation methods. Finally，an experimental platform was built to

verify the effectiveness of the proposed control strategy in optimizing current stress，meanwhile，the efficiency of

the converter was improved.

      Key words：dual active bridge（DAB）converter；double phase shift（DPS）modulation；current stress；efficiency