A novel trapezoidal multi-coil antenna for wireless charging of electric vehicles

Abstract

In this paper, a novel trapezoidal multi-coil antenna is proposed to mitigate lateral misalignment in wireless charging application of electric vehicles (EVs). The proposed coil antenna used at the transmitter is optimized to improve stability of induced voltage which intern is expected to provide a stable power transfer efficiency over a wide range of vehicle’s misalignment. The proposed design adopts an isosceles trapezoid shape after analytical optimization and consists of three series connected coils placed at the top faces of the structure. The magnetic field distribution originated from this complex geometry is analytically modeled and optimized to obtain wider uniformity in the induced voltage of the receiver coil as compared to a conventional planar antenna. The design is verified using commercial EM software and results are corroborated. The results show that the proposed antenna provides enhanced tolerance towards misalignment is proved to be a potential design for wireless powering application of EVs.