为了解决双有源桥变换器(DAB)回流功率过大，轻载下失去零电压开关(ZVS)运行的问题，提出双变压器型串联谐振变换器(DTSRC)。该变换器采用双变压器结构，变压器两端所受电压应力减小。通过设计高频变压器变比系数k，DTSRC在轻载下能够保证开关管实现ZVS运行，减小了变换器开关损耗。同时，采用最小电流轨迹(MCT)控制策略，二次侧实现同步整流，消除了回流功率，减小了变换器导通损耗。实验表明：DTSRC的开关管在全范围下满足ZVS运行，整体运行效率超过90%。

A dual-transformer series resonant converter (DTSRC) is presented to enhance operating efficiency and widen soft-switching ranges. The dual-transformer structure is employed on the proposed converter, which can significantly reduce voltage stress across the transformers. Additionally, ZVS operation under light-load conditions is achieved and switching loss is minimized by designing the turns ratio coefficient k. To eliminate backflow power and reduce conduction loss, a minimum current trajectory (MCT) control strategy is implemented for DTSRC. Thus, synchronous rectification is realized on the secondary side, which makes the converter always operate with minimum current. Experimental results demonstrate that ZVS of all active switches is achieved during full power ranges. The operating efficiency of DTSRC is greatly improved.