A Dynamic Wireless Charging System Based on Transmitter Module Composed of Coplanar Double Bipolar Pads with Hybrid Compensation Topology

This paper targets to meet three key requirements of dynamic wireless charging system (WCS) for electric vehicles: high output power, misalignment tolerance, and good interoperability. A hybrid wireless charging system with transmitter module composed of coplanar double bipolar pads (BPPs) is designed. The primary side is composed of two BPPs which are driven out of phase to function as bipolar pads for generating larger fundamental magnetic flux height than unipolar pads. A hybrid compensation topology where the decoupled coils in the two BPPs adopt (LCC, S) and (S, LCC) topology, respectively, and that in BPP on the secondary side adopt (LCC, S) topology, forming four coupled coil pairs with LCC-LCC, S–S, S-LCC and LCC-S topologies. This hybrid compensation can effectively restrain the fluctuation of output power caused by the variation of mutual inductance in dynamic charging. And the symmetry of both the pad structure (BPP) and the compensation topologies ensures the transmitter module a good interoperability. The designed system is validated by experimental study on a 6 kW WCS prototype, where the deviations of output power are lower than 2.9% under a 220 mm X-axis misalignment with an efficiency higher than 88.6%.