A Dynamic Reconfiguration-Based Hybrid Network Design Methodology for IPT CC/CV Output

For an electric vehicle (EV) inductive power transfer (IPT) system, it is critical to develop the load-independent constant current (CC) and constant voltage (CV) output functions for battery energy charging. To realize these performances, a hybrid network design methodology based on dynamic reconfiguration is proposed in this article. Dynamic network reconfiguration is defined as the process of charging from one charging function to another. By partitioning the hybrid network topology into two cascaded parts-a dynamic reconfigurable network and a static compensation network-the CC/CV network developing process is simplified. The methodology is independent of the magnetic coupler, can be applied to either transmitters or receivers, and puts no restrictions on the compensation network topology. Moreover, the input-output transformation attributes and zero-phase angle (ZPA) performance of essential networks is analyzed to form the static network. As for the dynamic network, the output performance could be shifted by switches, and CC/CV output at the same ZPA frequency is combined to reduce reactive power loss. Besides, the T-type equivalent model of the magnetic coupler is decomposed as a part of the dynamic/static structure networks. Finally, a 1-kW reconfigurable IPT battery charger prototype is built to verify the design methodology.