Wireless energy transfer

  • US 10,097,044 B2
  • Filed: 06/20/2016
  • Issued: 10/09/2018
  • 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); and

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

    2, an intrinsic loss rate Γ

    2, and an intrinsic quality factor Q2

    2/(2Γ

    2),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 over a range of distances D between the source resonator and 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)}>

    2 over the range of distances D between the source resonator and the device resonator,wherein Q1>

    100 and Q2>

    100, andfurther comprising a current probe configured to measure a current in at least one of the resonators.

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