High-Misalignment Tolerance and Output Adjustable Wireless Charging System via Detuned Series–Series Compensated Reconfigurable Transmission Channels
Zhenjie Li, Jiafang He, Yusheng Huo, Mingfei Ban, Yiqi Liu, Jiuqing Liu
Abstract
This article proposes a wireless charging system (WCS) with two reconfigurable transmission channels to achieve constant current/voltage (CC/CV) charging, anti-misalignment solid ability, and zero voltage switching (ZVS) operation. First, the structure design and working principle of the orthogonal magnetic coupler (OMC) are given. The OMC's parameters are optimized using the orthogonal experimental design. Then, the coupling performance of OMC is illustrated by Ansys simulations. Second, the topology and principle of the designed WCS are analyzed. The relationship between charging controllability, misalignment performance, and system parameters is presented. The design method and working principle of the magnetic flux controllable inductor (MFCI) used as the power adjustment circuit and auxiliary improvement of anti-misalignment ability are provided. Third, the schematic diagram and hardware of the closed-loop controller are given. The PLECS simulations verify the feasibility of using the MFCI to realize the above design goals. Finally, an experimental prototype of an unmanned aerial vehicle (UAV) is built to validate the method's feasibility. When the maximum charging power is 126 W, the maximum system efficiency is 91.6%. Besides, assuming system efficiency decreases by 5% from the maximum value, the maximum horizontal misalignment ratio is 42%, corresponding to a desired approximately circular charging region.