An Alternate Arrangement of Active and Repeater Coils for Quasi-Constant Power Wireless EV Charging

As a means of transportation, electric vehicles (EVs) are gradually replacing oil-fueled vehicles and widely seen in the field of vision. To facilitate the charging of electric vehicles, static charging stations and highway dynamic wireless power transfer (WPT) systems are being popularized and promoted in many countries. Aiming at the problem of multiple inverters and high costs in the dynamic WPT systems for EVs, this paper proposes a scheme of alternately arranging the active coils and the repeater coils at the transmitter sides, which has the advantage of lower economic costs and reduces the number of the power converters by half. Dynamic quasi-constant power wireless EV charging can be achieved by adjusting the input voltage of the active coil. A mathematical model including three different operating modes during the dynamic process is developed to analyze the output power and system efficiency, and design the system parameters. The simulation results of the 1 kW system verify the validity of the proposed wireless EV charging scheme.