Maximizing Air Gap and Efficiency of Magnetic Resonant Coupling for Wireless Power Transfer Using Equivalent Circuit and Neumann Formula

The progress in the field of wireless power transfer in the last few years is remarkable. With recent research, transferring power across large air gaps has been achieved. Both small and large electric equipment have been proposed, e.g., wireless power transfer for small equipment (mobile phones and...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2011-10, Vol.58 (10), p.4746-4752
Main Authors: Imura, T., Hori, Y.
Format: Article
Language:English
Subjects:
Air gaps
Antennas
Computational efficiency
Computing time
Coupled modes
Couplings
Efficiency
Electric power generation
Electromagnetic fields
Electromagnetism
Equations
Equivalent circuits
Impedance
Mathematical analysis
Maximum efficiency
Power transfer
resonance frequency
Resonant frequency
wireless power transfer
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Summary:The progress in the field of wireless power transfer in the last few years is remarkable. With recent research, transferring power across large air gaps has been achieved. Both small and large electric equipment have been proposed, e.g., wireless power transfer for small equipment (mobile phones and laptops) and for large equipment (electric vehicles). Furthermore, replacing every cord with wireless power transfer is proposed. The coupled mode theory was proposed in 2006 and proven in 2007. Magnetic and electric resonant couplings allow power to traverse large air gaps with high efficiency. This technology is closely related to electromagnetic induction and has been applied to antennas and resonators used for filters in communication technology. We have studied these phenomena and technologies using equivalent circuits, which is a more familiar format for electrical engineers than the coupled mode theory. In this paper, we analyzed the relationship between maximum efficiency air gap using equivalent circuits and the Neumann formula and proposed equations for the conditions required to achieve maximum efficiency for a given air gap. The results of these equations match well with the results of electromagnetic field analysis and experiments.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2011.2112317