Optimal Design of Resonant Network for 800 V Class 11.1 kW Wireless Power Transfer System with Double-Sided LCC Compensation Circuit

This study proposes an optimal resonant network design for an 11.1 kW wireless power transfer (WPT) system with a double-sided LCC compensation circuit, targeting 800 V class battery applications. Conventional WPT circuit topologies and design parameters specified in existing standards, such as SAE J2954, are unsuitable for 800 V class battery systems because they impose excessive voltage and current stresses on the resonant network components. To address this, the proposed design focuses on minimizing component stresses while ensuring compliance with the output voltage requirements for 800 V battery charging. A switched capacitor technique is integrated into the resonant network to dynamically adjust the compensation capacitance, enabling seamless adaptation to the constant current–constant voltage charging profile. The feasibility of the WPT system is validated through simulations and experiments, demonstrating an input voltage of 400 VDC, an output voltage range of 560–820 VDC, and a rated power capacity of 11.1 kW. Under rated conditions, the system achieves a peak efficiency of 95%, underscoring its practicality for high-voltage electric vehicle charging applications.