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Investigation of High-Efficiency Wireless Power Transfer Criteria of Resonantly-Coupled Loops and Dipoles through Analysis of the Figure of Merit

Author

Listed:
  • Charles Moorey

    (School of Systems Engineering, University of Reading, Whiteknights, Reading RG6 6AY, UK)

  • William Holderbaum

    (School of Systems Engineering, University of Reading, Whiteknights, Reading RG6 6AY, UK)

  • Ben Potter

    (School of Systems Engineering, University of Reading, Whiteknights, Reading RG6 6AY, UK)

Abstract

The efficiency of a Wireless Power Transfer (WPT) system is greatly dependent on both the geometry and operating frequency of the transmitting and receiving structures. By using Coupled Mode Theory (CMT), the figure of merit is calculated for resonantly-coupled loop and dipole systems. An in-depth analysis of the figure of merit is performed with respect to the key geometric parameters of the loops and dipoles, along with the resonant frequency, in order to identify the key relationships leading to high-efficiency WPT. For systems consisting of two identical single-turn loops, it is shown that the choice of both the loop radius and resonant frequency are essential in achieving high-efficiency WPT. For the dipole geometries studied, it is shown that the choice of length is largely irrelevant and that as a result of their capacitive nature, low-MHz frequency dipoles are able to produce significantly higher figures of merit than those of the loops considered. The results of the figure of merit analysis are used to propose and subsequently compare two mid-range loop and dipole WPT systems of equal size and operating frequency, where it is shown that the dipole system is able to achieve higher efficiencies than the loop system of the distance range examined.

Suggested Citation

  • Charles Moorey & William Holderbaum & Ben Potter, 2015. "Investigation of High-Efficiency Wireless Power Transfer Criteria of Resonantly-Coupled Loops and Dipoles through Analysis of the Figure of Merit," Energies, MDPI, vol. 8(10), pages 1-21, October.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:10:p:11342-11362:d:57017
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    References listed on IDEAS

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    1. Giovanni Puccetti & Ugo Reggiani & Leonardo Sandrolini, 2013. "Experimental Analysis of Wireless Power Transmission with Spiral Resonators," Energies, MDPI, vol. 6(11), pages 1-10, November.
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    Cited by:

    1. Po Hu & Jieshuai Ren & Wenan Li, 2016. "Frequency-Splitting-Free Synchronous Tuning of Close-Coupling Self-Oscillating Wireless Power Transfer," Energies, MDPI, vol. 9(7), pages 1-16, June.
    2. Wei Wang & Xueliang Huang & Linlin Tan & Jinpeng Guo & Han Liu, 2016. "Optimization Design of an Inductive Energy Harvesting Device for Wireless Power Supply System Overhead High-Voltage Power Lines," Energies, MDPI, vol. 9(4), pages 1-16, March.
    3. Yong Li & Ruikun Mai & Tianren Lin & Hongjian Sun & Zhengyou He, 2017. "A Novel WPT System Based on Dual Transmitters and Dual Receivers for High Power Applications: Analysis, Design and Implementation," Energies, MDPI, vol. 10(2), pages 1-16, February.
    4. Alicia Triviño-Cabrera & José A. Aguado Sánchez, 2018. "A Review on the Fundamentals and Practical Implementation Details of Strongly Coupled Magnetic Resonant Technology for Wireless Power Transfer," Energies, MDPI, vol. 11(10), pages 1-20, October.
    5. Jin Zhang & Chonghu Cheng, 2016. "Analysis and Optimization of Three-Resonator Wireless Power Transfer System for Predetermined-Goals Wireless Power Transmission," Energies, MDPI, vol. 9(4), pages 1-20, April.

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