An Interoperable and High-Efficiency Wireless Electric Vehicle Charger Based on Reconfigurable Topology

This work proposes a solution to enhance interoperability and maintain high efficiency throughout the entire charging process in inductive power transfer systems for wireless electric vehicle charging. A novel reconfigurable magnetic coupling resonant topology with a dual-coupled LCC-compensated structure is proposed. When facing diverse potential configurations on the secondary side, the adaptable topology provides flexibility in switching singular or dual coupled coils, as well as different compensation networks. This enhances both the magnetic and electrical interoperability of wireless chargers. Besides, an IPT system is proposed based on the reconfigurable topology on both primary and secondary sides. Utilizing two power transfer paths and four selector switches, the system can switch between three constant current (CC) modes and two constant voltage (CV) modes, ensuring load-independent characteristics. This feature facilitates the CC-CV and multistage constant current (MSCC) outputs. Moreover, multiple optimal load values are configured to ensure high efficiency across wide range of loads. Finally, experimental results demonstrate the measured dc-dc efficiency ranges from 91.1% to 94.6% with the MSCC profile as the dc load varies from 18.33 to 165 Ω. In contrast, the CC-CV charging profile yields efficiency ranging from 89.3% to 93.9%.