Design of High-Efficiency Inductive Charging Systems for EVs

Abstract

This paper presents a comprehensive investigation into the design and optimization of high-efficiency inductive charging systems for electric vehicles (EVs). The proliferation of EVs necessitates advanced charging infrastructure that addresses limitations in conventional plug-in systems. Inductive power transfer (IPT) offers a wireless alternative through electromagnetic coupling between transmitter and receiver coils. This research examines critical design parameters including resonant frequency optimization, coil geometry configuration, magnetic core materials, and compensation network topologies. A systematic analysis of power transfer efficiency across varying air gap distances (100-300mm) and lateral misalignment conditions (±100mm) is conducted. The proposed system employs series-series (SS) compensation with ferrite-based magnetic shielding, achieving 94.2% efficiency at 150mm air gap with 7.7kW power transfer capability. Experimental validation demonstrates tolerance to ±75mm lateral misalignment while maintaining >90% efficiency. The findings provide actionable design guidelines for deploying practical IPT systems in residential and commercial EV charging applications.