Journal
2021 THIRTY-SIXTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2021)
Volume -, Issue -, Pages 1565-1572Publisher
IEEE
DOI: 10.1109/APEC42165.2021.9487132
Keywords
WPT; resonant reactive shielding coil; EV
Funding
- II-VI Foundation Block-Gift Graduate Research Program
- Engineering Research Center Program of the National Science Foundation
- DOE under NSF [EEC-1041877]
- CURENT Industry Partnership Program
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This study presents an investigation of a resonant reactive shielding coil for wireless power transfer systems. The design method is validated using an experimental prototype, and the effect of the shielding coil in systems with metal and ferrite plates is investigated.
An investigation of a resonant reactive shielding coil for wireless power transfer (WPT) systems is presented in this work. The shielding coil attenuates the magnetic field above and to the side of air-core WPT coils. A parameterized coil model is used to allow arbitrary circular winding geometry and current direction. Detailed modeling and mathematical calculations are provided, and an optimized design algorithm is proposed. The design method is validated using an experimental prototype shielding coil applied to a 3.03 MHz electric vehicle (EV) WPT system operating at 500 W output power. Experimental results show that the peak flux density on the top-center area of the coil is suppressed from 105 mu T to 50 mu T, and the magnetic field to the side of the vehicle is maintained well below the safety standard. In addition, effect of the shielding coil in WPT systems with metal and ferrite plates is investigated.
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