Triple active bridge (TAB) as an isolated multi-port converter is a promising integrated energy system for smart grids or electric vehicles. This paper aims to derive and analyse zero voltage switching (ZVS) regions of TAB, in which both switching losses are reduced, and EMI issues are mitigated. In the proposed closed-form solution of ZVS criteria, parameters such as the parasitic capacitance of the switches, the leakage inductance of the transformer, the switching frequency, the port voltage, the phase-shift inside and between the full-bridges are all taken into account. The analysis shows how the five degrees of freedom can be used to maintain ZVS operation in various operating points. The analysis and derived closed-form ZVS criteria are experimentally verified using a laboratory prototype. The derived analytical ZVS criteria are a powerful tool to study and optimise the operation of TAB converters.

中文翻译：

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三路有源桥式变换器的零电压开关准则

三重有源电桥（TAB）作为一种隔离式多端口转换器，是一种用于智能电网或电动汽车的有前途的集成能源系统。本文旨在推导出和分析 TAB 的零电压开关 (ZVS) 区域，在这些区域中，开关损耗降低，EMI 问题得到缓解。在提出的 ZVS 准则的封闭形式解中，诸如开关寄生电容、变压器漏电感、开关频率、端口电压、全桥内部和全桥之间的相移等参数都被采用考虑到。分析显示了如何使用五个自由度来维持不同工作点中的 ZVS 操作。使用实验室原型对分析和导出的封闭形式 ZVS 标准进行了实验验证。