The deployment of external wireless charging infrastructures for unmanned aerial vehicles (UAVs) has faced several challenges, including as the requirement for accurate location, the expensive nature of charging multiple loads, and the absence of system robustness. This article suggests a new spatial magnetic field configuration for transmitting coils in wireless power transfer systems to tackle these problems. The construction features a square base with a rhombus embedded inside it, along with four rectangular sides that are coiled in a noncrossing manner. This configuration ensures a consistent distribution of magnetic field in three dimensions. In order to guarantee that many UAVs are charged simultaneously without interfering with one another, the LCC -S topology is used to accomplish the characteristic of constant current at the main side and constant voltage at the output side. During UAV hovering, output dc–dc is combined with charge management to achieve hovering power supply and constant current charging with minimum size. The experimental results show that when the UAV hovers in the three-dimensional conical space volume above the WPT platform, it maintains a stable output power with an approximately constant 84.5% transmission efficiency. A video file demonstrating wireless charging testing for drones is attached to this article.

中文翻译：

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支持多无人机飞行中并发充电的自由位置动态WPT系统


无人机 (UAV) 外部无线充电基础设施的部署面临着多项挑战，包括精确定位的要求、为多个负载充电的昂贵性质以及系统鲁棒性的缺乏。本文提出了一种用于无线电力传输系统中的发射线圈的新空间磁场配置来解决这些问题。该结构的特点是一个方形底座，里面嵌入了一个菱形，还有四个以非交叉方式盘绕的矩形边。这种配置确保了磁场在三个维度上的一致分布。为了保证多架无人机同时充电且互不干扰，采用LCC-S拓扑实现主侧恒流、输出侧恒压的特性。无人机悬停时，输出dc-dc与充电管理相结合，以最小的尺寸实现悬停供电和恒流充电。实验结果表明，当无人机悬停在WPT平台上方的三维锥形空间体积内时，保持稳定的输出功率，传输效率近似恒定84.5%。本文附有演示无人机无线充电测试的视频文件。