Dual-active-bridge (DAB) converter is a promising technology for the high-frequency and high-power application of electric vehicle (EV) chargers. To reduce losses of power exchange between EV battery and power source or load, several control methods, such as tripe phase-shift (TPS) control with minimum-current-stress optimization, are used in DAB converter. However, in most existing works, the dead-time effects are not considered, which will result in a non-zero-voltage-switching (non-ZVS) operation and thus inaccurate optimization results. This paper analyzes the influence of junction capacitance and dead time on the ZVS characteristics, and proposes a TPS control-based optimization scheme aiming at the minimum inductor current stress under the premise of ZVS operation. The proposed approach can further improve the operating efficiency of DAB converters. Simulation results validate the effectiveness of proposed optimization scheme, where the losses can be reduced significantly under light load.