Design and analysis of CPT system unmanned aerial vehicle applications

To address the limitations of conventional UAV charging methods, this paper presented a lightweight, high-efficiency, and high-power-density wireless charging system for unmanned aerial vehicles (UAVs) based on electric field coupling power transfer (ECPT) technology, which provides an effective solution that integrates high power, high efficiency, and low loss, offering significant engineering value for future UAV wireless charging systems. The system adopts a dual-sided LC compensation topology combined with a tightly coupled quadrupole plate structure. By analyzing the resonant characteristics and deriving optimal design parameters, efficient power transfer at a high operating frequency of 1.5 MHz is achieved. To improve the transfer efficiency, aluminum oxide ceramic is employed as the dielectric material, while analysis of the coupling capacitance and dielectric properties is presented to improve the mutual capacitance and coupling coefficient. Experimental results demonstrate that the proposed ECPT system achieves stable constant–current output with a maximum power conversion efficiency of 87%. A prototype successfully delivers a rated output power of 200 W, validating the system's feasibility and practicality for UAV applications.