As the switching frequency of dual active bridge (DAB) continues to increase

the proportion of switching losses in the total losses gradually increases. The zero voltage switching (ZVS) control strategy has become the main means of reducing switching losses. However

traditional ZVS control strategies have the drawback of discontinuity and abrupt shift in the ZVS region considering dead time

which affects system stability. To address this issue

this paper proposes a ZVS and current stress optimization strategy with non-mutating phase shift control over the full power range. In the medium power range

due to the influence of dead time

the ZVS of all switching devices cannot be fully achieved. This article sacrifices the ZVS of the first bridge arm switching device to ensure continuous variation of the phase shift. In the high-power range

with the goal of continuously changing the shift ratio

the boundary line has been readjusted to achieve seamless switching between the medium-power range and the high-power range. Theoretical analysis shows that the optimization strategy proposed in this article can ensure the continuity of phase shift over the entire power range. By building a low-power experimental platform

the correctness and effectiveness of the proposed optimization strategy are verified.