DQ-Quadrature Power Supply Coil Sets with Large Tolerances for Wireless Stationary EV Chargers

Abstract

New DQ-quadrature power supply coil sets for wireless stationary EV chargers, which have two coil sets having the 90 phase difference with large longitudinal, lateral as well as diagonal displacements, are proposed in this paper. Each power supply coil set consists of two same magnetic poles to generate uniform magnetic flux density over the power supply coil. A prototype inductive power transfer system (IPTS) using the proposed DQ-quadrature power supply coil sets for the wireless stationary EV chargers was fabricated for the experimental verifications with an operating frequency of 85 kHz to satisfy the standard J2954 of the society of automotive engineers (SAE). From simulation and experiment results, it is found that the lateral, longitudinal as well as diagonal displacements of the proposed coil sets increase about 35 % and 19 %, respectively, for the same size power supply coil compared with a conventional rectangular loop type coils at an air-gap of 150 mm.