Multi-Receiver Compatible Interoperable IPT System Based on Switchable Topology for EV Charging

Inductive power transfer (IPT) technology has been widely studied in electric vehicles (EVs) for wireless charging, and its interoperability greatly influences its popularization. This paper focuses on the charging pads as well as compensation networks and proposes a system that enables the transmitter to be compatible with different receivers of multiple vehicles. Firstly, representative coils and compensation topologies are picked out. On this basis, four receiver configurations are built and they are regarded as promising candidates for mainstream topologies from different manufacturers. Secondly, a switchable topology based on a high-order compensation structure and quadrature decoupled coils is proposed. When used as the transmitter, one of its branches can be switched on/off and is compatible with multiple receivers. Finally, a specific example of the interoperable IPT system is designed, and the design method as well as process of magnetic couplers and compensation element values is presented. Further, its performance is verified by circuit simulation. The proposed switchable topology provides a useful solution to achieve magnetic and electrical interoperability simultaneously.