Magnetic resonance wireless power transfer using three-coil system with single planar receiver for laptop applications

This paper presents a magnetic resonance wireless power transfer (WPT) system that uses three coils, a planar receiver and operates at 6.78 MHz,. Effective power transfer is ensured by establishing an impedance matching condition for this WPT system. A metamaterial (MTM) array having dimensions of 2...

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Bibliographic Details
Published in:IEEE transactions on consumer electronics 2015-05, Vol.61 (2), p.160-166
Main Authors: Van Thuan, Nguyen, Kang, Seok Hyon, Choi, Jung Han, Jung, Chang Won
Format: Article
Language:English
Subjects:
Arrays
Coils
Efficiency
Ground Effect
Magnetic resonance
Metamaterial
Portable computers
Protective coatings
Receivers
Spirals
Spray painting
Wireless power transfer
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Summary:This paper presents a magnetic resonance wireless power transfer (WPT) system that uses three coils, a planar receiver and operates at 6.78 MHz,. Effective power transfer is ensured by establishing an impedance matching condition for this WPT system. A metamaterial (MTM) array having dimensions of 20 cm X 30 cm is also positioned near the load coil to concentrate the magnetic field and enhance the transfer efficiency. The result is a maximal improvement of 27% in the transfer efficiency at a transfer distance of 50 cm. The impact of a ground plane on the transfer efficiency is also examined. By utilizing the MTM array, making slits on the ground plane and increasing the gap between the ground plane and the load coil, it is possible to mitigate this impact. The highest transfer efficiency improvement is about 55% at a distance of 20 cm with the ground plane. A practical laptop model is fabricated to verify the impact of the load coil angle and position on the transfer efficiency. The result shows that the maximum transfer efficiency with the laptop model is 47.58% with the load coil angle of 90 degree.
ISSN:0098-3063
1558-4127
DOI:10.1109/TCE.2015.7150569