Wireless energy transfer to a moving device between high-Q resonators

  • US 8,791,599 B2
  • Filed: 12/30/2009
  • Issued: 07/29/2014
  • Est. Priority Date: 07/12/2005
  • Status: Active Grant
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First Claim
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1. A system, comprising:

  • a first resonator having a resonant frequency ω

    1 and an intrinsic loss rate Γ

    1, and capable of storing electromagnetic energy with an intrinsic quality factor Q1

    1/(2Γ

    1) greater than 100, and configured to be coupled to an energy source to generate an oscillating near field region; and

    a second resonator having a resonant frequency ω

    2 and an intrinsic loss rate Γ

    2, and capable of storing electromagnetic energy with an intrinsic quality factor Q2

    2/(2Γ

    2) greater than 100, and configured to move freely within the near field region of the first resonator,wherein the first resonator and the second resonator are configured to be coupled to transfer electromagnetic energy from said first resonator to said second resonator when the first resonator is coupled to the energy source as the second resonator moves freely within the near field region, andfurther comprising the energy source configured to be coupled to the first resonator and an energy drain configured to be coupled to the second resonator to provide useful power to the energy drain, and wherein the energy source is configured to provide energy to the first resonator at a rate that varies with a rate of wireless energy transfer κ

    between the first resonator and the second resonator.

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