Analysis and Design of Quadruple-Active-Bridge Converter Employing Passive Power Decoupling Capability

This paper proposes an enhanced quadruple-Active-Bridge (QAB) converter which can solve power coupling problems. Because of adopting a multiple winding transformer, the equivalent circuit of a conventional QAB converter has power couplings between arbitrary output ports. The coupling power is unintended power relationship which complicates the regulation of the output voltage of the multiple ports. The proposed converter can conduct power decoupling by changing the arrangement of the coupling inductor. Power transfer equations for the proposed converter and its operating principles are analyzed in detail. Furthermore, to verify the power coupling caused by the transformer???s leakage inductance, a coupling factor which presents relationship between inductance ratio and coupling power is proposed. In addition, the decoupling power control performance of the proposed converter is verified by simulation and 3 kW prototype converter