Hardware implementation of WPT Charging System for EV Vehicles

Abstract

Transportation in urban areas is being transformed by various vehicles, with e-scooters being among the fastest growing. Despite their popularity, e-scooters face issues like incompatible chargers, especially problematic for rental services. Wireless charging emerges as a solution by enabling battery charging without user intervention. This paper focuses on the design and development of a magnetic-resonance charger for e-scooters. This research has detailed the coil topology, gap definition, and optimized control for a constant current-constant voltage (CC-CV) charge. This present key contribution is the integrated consideration of these factors, alongside the vehicle's materials and structure, for precise design and implementation. The vehicle's dimensions significantly constrain the coil design. Thus, in the past, a detailed analysis using Ansys Maxwell to determine the optimal locations for primary and secondary coils in an actual e-scooter was carried out. This analysis led to an optimal design for coil geometries, minimizing costs. The proposed system was validated with a real prototype, incorporating CC-CV control to ensure safe charging for various battery states, and is adaptable to a wide range of e-scooters, enhancing the usability of such chargers in public installations.