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Energies 2016, 9(3), 156; doi:10.3390/en9030156

An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique

School of Electronics Engineering, Kyungpook National University, Buk-gu, Daegu 702-701, Korea
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Academic Editor: Jihong Wang
Received: 15 October 2015 / Revised: 1 January 2016 / Accepted: 29 January 2016 / Published: 3 March 2016
(This article belongs to the Special Issue Energy Efficient Actuators and Systems)
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Abstract

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. View Full-Text
Keywords: wireless power transmission; magnetically-coupled resonators; coupling coefficient tuning; power transfer efficiency wireless power transmission; magnetically-coupled resonators; coupling coefficient tuning; power transfer efficiency
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Vijayakumaran Nair, V.; Choi, J.R. An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique. Energies 2016, 9, 156.

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