Abstract: In order to precisely describe the influences of the dead time on the dual active bridge (DAB) phase-shift deviation and power transmission, the snubber capacitance is introduced to the DAB dead-time effects. By setting the optimal dead time, the inductance current of the DAB converter ensures the zero-crossing point outside the dead time, thus the dead-time analysis is simplified in different voltage modes and the DAB power transmission is calculated more accurately with this dead-time model. The results show that this DAB dead-time model can deduce the steady-state solution accurately while the DAB small-signal modeling is promoted.