Integrated WPT and OBC Architecture for Electric Vehicles With a Single‐Layer Parallel‐Wound Coil Structure

ABSTRACT Electric vehicles (EVs) typically rely on two independent systems for wireless power transfer (WPT) and conductive charging. This paper introduces a fully integrated charging architecture that unifies both charging functionalities into a single hardware platform. The core of the proposed system is a single‐layer parallel‐wound dual‐coil structure, which replaces the conventional transformer in the CLLC resonant converter and enables full resonant capacitor sharing between the onboard charger (OBC) and WPT receiver. Unlike prior dual‐layer coil designs, the proposed structure not only supports high‐frequency OBC operation but also maintains strong magnetic coupling essential for WPT. By incorporating a compensating inductor for circuit symmetry and a DC‐side series connection in WPT mode, the system achieves complete hardware integration without additional AC‐side switching. Experimental results demonstrate that the DC–DC stage maintains efficiency above 96% across the operating range, validating the feasibility of a compact, cost‐effective, and compatibility‐assured dual‐mode charging solution.