Abstract

Introduction of wireless charging systems for electric vehicles (EVs) is a revolutionary step in the field of electrified transportation. Misalignments between transmitting and receiving power pads significantly affect the overall power transfer efficiency of EV wireless charging systems. In this paper, three power pads are evaluated for power transfer efficiency in wireless charging systems with respect to various vertical and horizontal misalignments. They are circular power pads, double D (DD) power pads, and a new power pad designed in this research named as double D circular (DDC). Circular and DD power pads are designed following the Society of Automotive Engineers (SAE) recommended practice J2954 using the software, ANSYS Maxwell 3D. The new DDC power pad is designed by combining a circular power pad and a DD power pad. The power transfer efficiency among the three types of power pads is compared in the paper. The new DDC power pad has 14.48% and 18.03% improved performance compared to the circular power pad at 150mm vertical misalignment and 115mm horizontal misalignment, respectively.

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