| Abstract |
A quasi-decoupled family of the three-port DC-DC converters for the applications requiring multipleDC power sources is proposed. The proposed topologies employ a two-level quasi-decoupling approach that combines circuit and control levels decoupling to provide enhanced freedom for manipulation of the control parameters to achieve efficient power conversion among ports. The circuit-level quasi-decoupling is achieved by a choice and configuration of the asymmetric impedances, however, control-level quasi-decoupling is realized by appropriately selecting and varying the available control parameters. The proposed topologies and control method results in a simplified power-flow control with increased freedom to vary control parameters for achieving minimum reactive current to reduce conduction loss and soft-switching to reduce switching loss. To validate the proposed quasi-decoupled topologies, a three-port DC-DC converter based on a dual-active-bridge (DAB) converter with asymmetrical impedances and optimized selection of control parameters is built for electric vehicle (EV) on-board-charger (OBC) applications. |
