Analysis and Mitigation of Circulating Common-Mode Current in Isolated Dual Active Bridge Converter

This paper deals with the phenomenon of the circulating current that propagates between the two H-Bridges via the ground, termed the circulating common-mode current (CCMC). The circumstances that facilitate the CCMC are presented with experimental validations. The propagation path and the voltage source of the CCMC are analyzed with the help of the commonmode (CM) equivalent circuit. In addition, the design of the coupled inductor to address the CCMC is discussed in detail. All the experimental validations are performed on a prototype DAB converter.