A Coil Design and Control Method of Independent Active Shielding System for Leakage Magnetic Field Reduction of Wireless UAV Charger

Jedok KIM  Jangyong AHN  Sungryul HUH  Kibeom KIM  Seungyoung AHN  

Publication
IEICE TRANSACTIONS on Communications   Vol.E103-B   No.9   pp.889-898
Publication Date: 2020/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2019MCI0001
Type of Manuscript: INVITED PAPER (Special Section on Electromagnetic Compatibility in Conjunction with EMC Sapporo and APEMC 2019)
Category: 
Keyword: 
active shielding,  wireless power transfer,  inductive power transfer,  electromagnetic field,  unmanned aerial vehicle (UAV),  

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Summary: 
This paper proposes a single coil active shielding method of wireless unmanned aerial vehicle charger for leakage magnetic field reduction. A proposed shielding system eliminates the leakage magnetic field generated from the transmitting and receiving coils by generating the cancelling magnetic field. In order to enhance shielding effectiveness and preserve power transfer efficiency, shielding coil design parameters including radius and turns will analyze. Based on the analysis of coil design, shielding effectiveness and power transfer efficiency will estimate. In addition, shielding current control method corresponding to leakage magnetic field strength and phase will describe. A proposed shielding system has verified by simulations and experiments in terms of the total shielding effectiveness and power transfer efficiency measurements. The simulation and experimental results show that a proposed active shielding system has achieved 68.85% of average leakage magnetic field reduction with 1.92% of power transfer efficiency degradation. The shielding effectiveness and power transfer efficiency variation by coil design has been experimentally verified.