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
CIRCUIT DIAGRAM:
Fig.
1. (a) Wireless charging system structure. (b) The gate drive signals and
output
voltage of the inverter. (c) Equivalent circuit model.
Fig.
2. Power transfer ability test. (a) Measured waveforms of system, (b) Input and
output power test.
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 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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