应用于无人机的无线充电技术研究

Aiming at the problem that the unmanned aerial vehicle (UAV) wired charging is not convenient and requires manual intervention, a magnetically coupled resonant wireless charging technology is used to design a wireless charging system for the UAV. A wireless charging coupler suitable for UAV is proposed. The transmitting device has a bipolar magnetic field characteristic. The receiving device adopted a method of winding a coil on a small ferrite strip, and the receiving device was installed at the bottom of the landing gear. The finite element analysis method was performed to analyze magnetic feature of the coupler, and it is shown that the magnetic field is converged in the vicinity of the receiving device to avoid magnetic leakage interference to UAV. According to the system constant voltage output requirement, the primary side LCL and secondary series compensation topology was selected, the mathematical model of the system circuit was established, and the input-output voltage relationship was obtained to guide the system parameter design. The wireless charging system was built and tested. The results show that measured results are well-matched with the theoretical value of the circuit model, and the designed system can charge the 80 W UAV within a misalignment of 30 mm.