Multi-resonator wireless energy transfer for exterior lighting

  • US 8,441,154 B2
  • Filed: 10/28/2011
  • Issued: 05/14/2013
  • Est. Priority Date: 09/27/2008
  • Status: Active Grant
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First Claim
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1. A mobile wireless receiver for use with a first electromagnetic resonator coupled to a power supply and a second electromagnetic resonator coupled to at least one of a power supply and the first electromagnetic resonator, the first electromagnetic resonator having a mode with a resonant frequency ω

  • 1, an intrinsic loss rate Γ

    1, and a first Q-factor Q1

    1/2Γ

    1 and the second electromagnetic resonator having a mode with a resonant frequency ω

    2, an intrinsic loss rate Γ

    2, and a second Q-factor Q2

    2/2Γ

    2, the mobile wireless receiver comprising;

    a load associated with an outdoor lighting unit that draws energy from the load to power a light source associated with the outdoor lighting unit; and

    a third electromagnetic resonator configured to be coupled to the load and movable relative to at least one of the first electromagnetic resonator and the second electromagnetic resonator, the third resonator having a mode with a resonant frequency ω

    3, an intrinsic loss rate Γ

    3, and a third Q-factor Q3

    3/2Γ

    3,wherein the third resonator is configured to be wirelessly coupled to at least one of the first electromagnetic resonator and the second electromagnetic resonator to provide resonant, non-radiative wireless power to the third electromagnetic resonator from at least one of the first electromagnetic resonator and the second electromagnetic resonator with a wireless energy transfer rate κ

    , andwherein the square root of the product of Q3 with at least one of Q1 and Q2 is greater than 100.

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