Wireless non-radiative energy transfer

  • US 9,450,421 B2
  • Filed: 02/24/2015
  • 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 for providing power to a vehicle, the system comprising:

  • a source resonator configured to be coupled to a power supply 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), the source resonator comprising at least one loop of conductive material and further comprising a capacitance; and

    a device resonator configured to be coupled to a load 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), the device 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 over a range of distances D between the source and device resonators using non-radiative electromagnetic induction having a coupling coefficient κ

    , and wherein the intrinsic loss rates satisfy κ

    /√

    {square root over (Γ

    1Γ

    2)}>

    5 over the range of distances D, andwherein Q1>

    100 and Q2>

    100.

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