A High Misalignment Tolerance SCC-WPT System With Relay Single Capacitive Coupler for UAV Wireless Charging Applications

This letter proposes a single capacitive coupled wireless power transfer (SCC-WPT) system for unmanned aerial vehicle (UAV) wireless charging applications. By using the inherent UAV helipad as the relay plate, a constant voltage output is achieved. Furthermore, the SCC-WPT system circuits are well presented and analyzed in this letter, and strong misalignment tolerance performance in horizontal as well as rotational situations can be effectively achieved. An experimental prototype was developed, and the experimental results verify that the system can not only maintain stable output voltage under extremely strong misalignment conditions (when the receiver of the system is placed at any position in the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">xOy</i> plane on the relay plate or rotates 360°) but also achieve constant output voltage when the load changes. The experimental results greatly agree with the theoretical analysis.