An LCL-N Compensated Strongly-Coupled Wireless Power Transfer System for High-Power Applications

An LCL-none (LCL-N) topology is proposed in this paper for high-power strongly-coupled wireless charging systems. The receiver-side compensation is eliminated to achieve a compact and lightweight receiver. The efficiency is still high due to the strongly-coupled characteristic. The phase difference between the transmitter and receiver currents is larger than 90°, leading to the magnetic flux cancelation in the ferrites. Thus, the required ferrite thickness of the LCL-N topology is smaller than the fully-compensated topologies. Therefore, a compact, lightweight, and low-cost receiver is achieved. The model of the LCL-N topology is built and the output power and the efficiency are analyzed. A full-scaled system of 100 kW is designed and simulated. A downscaled 1 kW system is implemented. The simulations and experiments have verified the effectiveness of the analysis.