Wireless energy transfer

  • US 9,450,422 B2
  • Filed: 03/24/2015
  • Issued: 09/20/2016
  • Est. Priority Date: 07/12/2005
  • Status: Active Grant
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First Claim
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1. A wireless power system comprising:

  • a source resonator and a power supply coupled to the source resonator to provide power to the source resonator, the source resonator having a resonant frequency ω

    1, an intrinsic loss rate Γ

    1, and an intrinsic quality factor Q1

    1/(2Γ

    1), the source resonator comprising at least one loop of conductive material; and

    a device resonator and a load coupled to the device resonator to receive power from the device resonator and provide power to the load, the device resonator having a resonant frequency ω

    2, an intrinsic loss rate Γ

    2, and an intrinsic quality factor Q2

    2/(2Γ

    2), the device resonator comprising at least one loop of conductive material,wherein the device resonator is configured to be movable relative to the source resonator over a range of distances D between the source resonator and the device resonator,wherein the source resonator and the device resonator are configured to resonantly and wirelessly couple electromagnetic power from the source resonator to the device resonator using non-radiative electromagnetic induction having a coupling coefficient κ

    , and wherein the intrinsic loss rates satisfy κ

    /√

    {square root over (Γ

    1Γ

    2)}>

    1 over the range of distances D, andwherein the power provided to the load from the device resonator defines a work drainage rate Γ

    w, and wherein the work drainage rateΓ

    w, is configured to be set such that Γ

    w

    2

    {square root over (1+wp·



    2

    1·

    Γ

    2))} for some value of the coupling coefficient κ

    in the range of distances D, wherein wp is a parameter satisfying wp>

    1.

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