This letter develops a wireless charging system based on a novel orthogonal magnetic structure and primary-side power control to simplify the structure and reduce the weight of on-board pick-up for recharging the unmanned aerial vehicles (UAVs). The novel magnetic structure has a polarized transmitter with a flat U-type core and a perpendicular air-cored receiving coil, guaranteeing the magnetic flux operation space away from UAV body by coil structure itself and also reducing the weight of magnetic receiver. The power flow to the battery is controlled by the primary-side based on charging current and voltage feedback by pick-up. Simulations based on ANSYS Maxwell and experiments are carried out to validate the proposal. The weight of magnetic receiver is 130g. And the system can deliver 500W with a DC-to-Battery efficiency of 90.8%, meanwhile 10A constant current/50V constant voltage charging for 12S lithium-ion battery is achieved by the closed-loop system.

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A 500-W Wireless Charging System with Lightweight Pick-
Up for Unmanned Aerial Vehicles
ABSTRACT:
This letter develops a wireless charging system based on a novel orthogonal magnetic structure
and primary-side power control to simplify the structure and reduce the weight of on-board pick-
up for recharging the unmanned aerial vehicles (UAVs). The novel magnetic structure has a
polarized transmitter with a flat U-type core and a perpendicular air-cored receiving coil,
guaranteeing the magnetic flux operation space away from UAV body by coil structure itself and
also reducing the weight of magnetic receiver. The power flow to the battery is controlled by the
primary-side based on charging current and voltage feedback by pick-up. Simulations based on
ANSYS Maxwell and experiments are carried out to validate the proposal. The weight of
magnetic receiver is 130g. And the system can deliver 500W with a DC-to-Battery efficiency of
90.8%, meanwhile 10A constant current/50V constant voltage charging for 12S lithium-ion
battery is achieved by the closed-loop system.
KEYWORDS:
1. Unmanned aerial vehicles (UAVs)
2. Wireless charging
3. Magnetic structure
4. Primary-side control
SOFTWARE: MATLAB/SIMULINK

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CIRCUIT DIAGRAM:
Fig. 1. (a) Wireless charging system structure. (b) The gate drive signals and
output voltage of the inverter. (c) Equivalent circuit model.

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EXPERIMENTAL RESULTS:
Fig. 2. Power transfer ability test. (a) Measured waveforms of system, (b) Input and output power test.

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Fig. 3. Closed-loop system operation test. (a) Change the equivalent load resistance RB from 3 to 33 . (b) Change
the equivalent load resistance RB from 3 to 8
CONCLUSION:
A novel orthogonal magnetic structure, which has a lightweight magnetic receiver, for UAVs,
has been proposed and verified throughout this letter. The air-cored receiving coil is placed
vertically in the middle of a polarized transmitter, possessing a large magnetic flux captured
surface for enough power transfer and also constraining magnetic field operation space away

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from UAV’s body by coil-structure itself. The primary-side power control method is adopted to
regulate the power flow to battery, which further reduces the weight of on-board pick-up circuit.
A prototype was built for experiment. It is shown that the system can successfully deliver 500W
to UAV with a DC-to-Battery efficiency of 90.8%. The simulation and experimental results
confirm the effectiveness of the proposal.
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