Abstract
In order to maximize the inductive link efficiency in wireless electric vehicle (EV) chargers, a ferrite layer is added to focus the magnetic field lines, improve the coupling performance, and reduce the leakage of flux to the surrounding ferrous materials. The geometry of ferrite directly affects the self and mutual inductances of the primary and secondary coils and accordingly their coupling factor. Three ferrite geometries are investigated in this work, and their coupling behavior is studied and compared to that of a ferrite sheet. Due to the inherent misalignment variations in wireless EV chargers, the simulation is conducted over a range of air gaps as well as lateral and longitudinal misalignments. Based on the simulation results, the geometry with long ferrite bars is recommended for dynamic EV charging scenarios in which large lateral misalignments are expected, whereas shorter bars are more recommended for static charging scenarios due to their smaller volume and cost-effectiveness despite their lesser tolerance for lateral misalignment in comparison to long ferrite bars.
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