Misalignment-compensated resonant power transfer system

Electric Vehicle (EV) technology is an ideal candidate for environment-friendly and pollution-free transportation. Wireless chargers, where EV batteries can simply be charged by parking the vehicle on a charging pad, provide customers with convenience and electrical safety. In addition, cordless chargers also bring new charging strategies such as “opportunistic” and “charge-on-the-go”. Cordless EV charging technology, based on the principle of resonance (inductive or coupled magnetic) is a variant of air core transformer. In this work, we propose a novel system based on magnetic resonance principle that would passively compensate for any misalignment between transmitter and receiver coil assemblies thereby maintaining high efficiency. The proposed system is prototyped and the performance is validated against an equivalent circuit model.