A Topology‐Reconfigurable Wireless Charging System for Electric Vehicles Enabling Wide‐Range and High‐Efficiency Output

Abstract

ABSTRACT With an increasing number of electric vehicles (EVs) manufacturers deploying wireless power transfer (WPT) technology, the efficiency and adaptability of such systems have garnered growing attention. To address the challenge of maintaining high efficiency over a wide battery voltage range (100–420 V) in EV wireless charging systems, this paper proposes a magnetically coupled resonant WPT system based on topology reconfiguration. The transmitter employs two identically sized unipolar coils arranged with partial overlap to achieve magnetic decoupling. By controlling the switching network at the transmitter side to switch operating modes, the proposed topology achieves high‐efficiency output across four discrete voltage modes—100, 200, 300, and 400 V—without relying on a post‐stage DC–DC converter or extreme parameter regulation. Furthermore, zero‐voltage switching (ZVS) is achieved in all four modes. A unified mathematical model of the system is established to reveal its operating mechanism, and its performance is validated using a 4.1‐kW experimental platform. Experimental results demonstrate that under perfectly aligned conditions, the system efficiencies at the respective target output voltages are 90.726%, 94.908%, 95.193%, and 95.638%. Additionally, the system was rigorously tested and verified through misalignment and variable‐load experiments. The results indicate that the system can maintain high‐efficiency operation across the entire voltage range and it achieves strong anti‐misalignment robustness and favorable constant‐voltage output performance. This verifies that the proposed topology is a highly effective approach for achieving efficient and stable wireless charging over a wide voltage range.