中文摘要：

中频隔离DC-DC变换器是电力电子变压器的核心环节,其性能直接影响系统的性能和效率;串联谐振双有源桥DC-DC变换器的开关损耗较小,且能够方便地实现能量的双向流动,非常适用于电力电子变压器。文章从频域分析入手,考虑了所有的高频谐波分量,推导了串联谐振双有源桥DC-DC变换器的精确稳态模型,在此基础上得到了变换器的功率传递特性和软开关特性。分析结果表明,相比于传统的基频分量近似法,该分析方法在软开关的分析上有较大改善。最后通过实验验证了分析方法的准确性。

英文摘要：

Isolated bidirectional DC/DC converter is the core of power electronic transformer and influences the performance and efficiency of the system. Switching losses can be reduced and bidirectional power flow can be easily achieved with the use of series resonant dual active bridge （SRDAB） DC/DC converter. Thus a precise model is required for control system and converter design. In this paper, we took all the harmonic components into consideration, and deduced a precise steady-state modeling of SRDAB. Compares to traditional first harmonic approximation （FHA） method, the new method provides more accurate zero-voltage-switching （ZVS） turn-on condition. Effectiveness of the analysis method was validated through a laboratory prototype.