Steady-State Performance Optimization of Dual-Bridge Series Resonant DC/DC Converters

By establishing the mathematical model of the resonant-tank root-mean-square (rms) current of the dual-bridge series resonant dc/dc converter (DBSRC), this article comparatively analyzes the performance of the DBSRC under asymmetric-phase shift (APS) control. This article analyzes the influence of the dead-time gap on APS control. Then, a steady-state performance optimization strategy is proposed in this article for DBSRC under APS control considering the dead-time gap, and the proposed control scheme is analyzed and implemented. The steady-state performance optimization strategy can minimize the resonant tank rms current, extend the zero voltage switching (ZVS) range, eliminate the influence of the dead-time gap and enhance the transmission efficiency of the DBSRC. Besides, the resonant tank parameters sensitivity of the proposed optimization strategy is discussed, and a simple parameters estimation strategy is proposed. At last, the excellent performance and theoretical analysis of the steady-state optimization strategy have been verified in this article.