In the plant protection drone wireless power transfer system, the positional deviation of the transmitting coils and the receiving coils will cause the efficiency of wireless power transmission drops. In view of this problem, an anti-offset constant current wireless power transfer technology by adjusting the duty cycle of the secondary side buck circuit is proposed in this paper. By establishing a theoretical model of wireless power transfer system for plant protection drone, the relationship between positional deviation and charging current and charging power charging efficiency is analyzed. The magnetic field between transmitting coil and the receiving coil is simulated and compared using Maxwell. In order to further verify the correctness of the theoretical analysis, mathcad is used for simulation analysis. Finally, an experimental platform using the design parameters is built to verify the anti-offset performance. The experimental results show that under different misalignment conditions the charging current can be maintained at 2 A. Compared with the traditional wireless charging system, the system efficiency is improved as much as 3.54%.

中文翻译：

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防偏移无线充电植保无人机研究与应用

在植保无人机无线电能传输系统中，发射线圈和接收线圈的位置偏差会导致无线电能传输效率下降。针对这一问题，本文提出了一种通过调整二次侧降压电路占空比的抗偏移恒流无线电力传输技术。通过建立植保无人机无线电力传输系统的理论模型，分析了位置偏差与充电电流和充电功率充电效率之间的关系。利用麦克斯韦对发射线圈和接收线圈之间的磁场进行模拟和比较。为了进一步验证理论分析的正确性，使用mathcad进行仿真分析。最后，搭建了一个使用设计参数的实验平台来验证抗偏移性能。实验结果表明，在不同的错位情况下，充电电流可以保持在2A，与传统的无线充电系统相比，系统效率提高了3.54%。