Wireless non-radiative energy transfer

  • US 10,141,790 B2
  • Filed: 10/25/2017
  • Issued: 11/27/2018
  • Est. Priority Date: 07/12/2005
  • Status: Active Grant
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First Claim
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1. An apparatus for a wireless power system for providing power to a vehicle, the wireless power system including a device resonator and a load coupled to the device resonator to receive power from the device resonator and for powering the vehicle, the device resonator having a resonant frequency ω

  • 2, an intrinsic loss rate Γ

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

    2/(2Γ

    2)≥

    200, the device resonator comprising at least one loop of conductive material and further comprising a capacitance,the apparatus 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 capable of storing electromagnetic energy with an intrinsic quality factor Q1

    1/(2Γ

    1)>

    200, the source resonator comprising at least one loop of conductive material and further comprising a capacitance,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 an energy transfer rate κ

    , and wherein the intrinsic loss rates satisfy κ

    /√

    {square root over (Γ

    1Γ

    2)}>

    5 over a range of distances D, andwherein the source resonator and the device resonator each have a characteristic size, and the characteristic size of the source resonator is not more than 100/30 times the characteristic size of the device resonator.

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