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Electric vehicle (EV) has emerged as a transformative force for thesustainable and environmentally friendly future. To alleviate range anxietycaused by battery and charging facility, dynamic wireless power transfer (DWPT)is increasingly recognized as a key enabler for widespread EV adoption, yet itfaces significant technical challenges, primarily in precise coil alignment.This article begins by reviewing current alignment methodologies and evaluatestheir advantages and limitations. We observe that achieving the necessaryalignment precision is challenging with these existing methods. To addressthis, we present an innovative RFID-based DWPT coil alignment system, utilizingcoherent phase detection and a maximum likelihood estimation algorithm, capableof achieving sub-10 cm accuracy. This system's efficacy in providing bothlateral and vertical misalignment estimates has been verified throughlaboratory and experimental tests. We also discuss potential challenges inbroader system implementation and propose corresponding solutions. Thisresearch offers a viable and promising solution for enhancing DWPT efficiency.

Precise Coil Alignment for Dynamic Wireless Charging of Electric Vehicles with RFID Sensing