Wireless energy transfer across a distance to a moving device

  • US 8,772,972 B2
  • Filed: 12/30/2009
  • Issued: 07/08/2014
  • 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 configured to be coupled to an energy source to generate a near field region comprising a temporally oscillating magnetic field; and

    a second resonator 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 resonantly coupled to wirelessly transfer electromagnetic energy from said first resonator to said second resonator as the second resonator moves freely within the near field region,and where the region includes distances D greater than the characteristic size of each of the first resonator and the second resonator,wherein the first resonator has a resonant frequency ω

    1, an intrinsic loss rate Γ

    1, and is capable of storing electromagnetic energy with a high intrinsic quality factor Q1

    1/(2Γ

    1),wherein the second resonator has a resonant frequency ω

    2, an intrinsic loss rate Γ

    2, and is capable of storing electromagnetic energy with a high intrinsic quality factor Q2

    2/(2Γ

    2), andwherein Q1>

    100 and Q2>

    100, andwherein the distances D for the near-field wireless energy transfer are less than the wavelengths λ

    1=c/2π

    ω

    1 and λ

    2=c/2π

    ω

    2 corresponding to the resonant frequencies ω

    1 and ω

    2, respectively, where c is the speed of light.

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