LAPSE:2018.0889
Published Article
LAPSE:2018.0889
An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique
Vijith Vijayakumaran Nair, Jun Rim Choi
November 27, 2018
For magnetic-coupled resonator wireless power transmission (WPT) systems, higher power transfer efficiency can be achieved over a greater range in comparison to inductive-coupled WPT systems. However, as the distance between the two near-field resonators varies, the coupling between them changes. The change in coupling would in turn vary the power transfer efficiency. Generally, to maintain high efficiency for varying distances, either frequency tuning or impedance matching are employed. Frequency tuning may not limit the tunable frequency within the Industrial Scientific Medical (ISM) band, and the impedance matching network involves bulky systems. Therefore, to maintain higher transfer efficiency over a wide range of distances, we propose a multiple coil switching wireless power transmission system. The proposed system includes several loop coils with different sizes. Based on the variation of the distance between the transmitter and receiver side, the power is switched to one of the loop coils for transmission and reception. The system enables adjustment of the coupling coefficient with selective switching of the coil loops at the source and load end and, thus, aids achieving high power transfer efficiency over a wide range of distances. The proposed technique is analyzed with an equivalent circuit model, and simulations are performed to evaluate the performance. The system is validated through experimental results that indicate for a fixed frequency (13.56 MHz) that the switched loop technique achieves high efficiency over a wider range of distances.
Keywords
coupling coefficient tuning, magnetically-coupled resonators, power transfer efficiency, wireless power transmission
Suggested Citation
Vijayakumaran Nair V, Choi JR. An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique. (2018). LAPSE:2018.0889
Author Affiliations
Vijayakumaran Nair V: School of Electronics Engineering, Kyungpook National University, Buk-gu, Daegu 702-701, Korea
Choi JR: School of Electronics Engineering, Kyungpook National University, Buk-gu, Daegu 702-701, Korea
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Journal Name
Energies
Volume
9
Issue
3
Article Number
E156
Year
2016
Publication Date
2016-03-03
Published Version
ISSN
1996-1073
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PII: en9030156, Publication Type: Journal Article
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LAPSE:2018.0889
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doi:10.3390/en9030156
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Nov 27, 2018
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Nov 27, 2018
 
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Calvin Tsay
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