In this article, a new resonant three-port dc–dc converter with dual half bridges plus one full bridge is proposed, which can realize bidirectional power flow between each port. The resonant capacitor has three functions in the circuit: the resonant capacitor can improve the magnetic bias of half bridge converter, and therefore, the transformer saturation can be avoided; the resonant capacitor is introduced to make the inductor current close to sine wave, so that the eddy current loss of the transformer can be reduced; by setting the resonant frequency of one of the three ports equal to the switching frequency, the mutual interference between the other two ports can be reduced, so that the hardware decoupling effect is achieved. First, the operation principle of the three-port converter is analyzed. Second, the steady-state model of the converter is established, and the power transmission characteristics and soft-switching characteristics are analyzed. Third, the cause of the power coupling between ports is analyzed and the hardware decoupling method is proposed. Finally, the number of magnetic elements is reduced through magnetic integration, and the correctness of the theoretical analysis is verified by simulation and prototype experiments.

中文翻译：

---

具有去耦功能和磁集成的串联谐振三端口DC-C转换器


本文提出了一种新型谐振三端口DC-DC转换器，具有双半桥加一个全桥，可以实现每个端口之间的双向功率流。谐振电容在电路中具有三个作用：谐振电容可以改善半桥变换器的偏磁，从而避免变压器饱和；谐振电容可以改善半桥变换器的偏磁，从而避免变压器饱和。引入谐振电容，使电感电流接近正弦波，从而减少变压器的涡流损耗；通过设置三个端口之一的谐振频率等于开关频率，可以减少另外两个端口之间的相互干扰，从而达到硬件去耦的效果。首先分析三端口转换器的工作原理。其次，建立了变换器的稳态模型，分析了功率传输特性和软开关特性。第三，分析了端口间功率耦合的原因，提出了硬件解耦的方法。最后通过磁集成减少了磁性元件的数量，并通过仿真和样机实验验证了理论分析的正确性。