Analytical Treatment of the Power Transfer Relationships for a Coupled, Current-Fed, Multi-Port Dual Active Bridge Converter

This paper explains the current-fed behavior that mutual inductors introduce to the load ports of a Dual Active Bridge (DAB)-based, multi-port converter. In particular, the potentially non-ideal square waveforms at load port voltages are mathematically described. The converter characteristic equations are then verified with PLECS simulations. Finally, the effects of inductor size on port voltage shape and power transfer are explored. The results of the analyses provide the conditions in which power flow equations for voltage-fed multi-port converters are applicable.