Wireless non-radiative energy transfer

  • US 9,065,286 B2
  • Filed: 06/12/2014
  • Issued: 06/23/2015
  • 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 module 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), the source resonator comprising at least one loop of conductive material and further comprising a capacitance; and

    a portable electronic device having a device module comprising a device resonator and a load coupled to the device resonator to receive power from the device resonator and provide power to the portable electronic device, 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 device module is spaced from the source module and configured to move freely relative to the source module over a range of distances D between the source module and the device module,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)}>

    2 over the range of distances D, andwherein f1

    1/(2π

    ) and f2

    2/(2π

    ), and f1 and f2, are between about 5 MHz and 380 MHz, and each intrinsic loss rate comprises a resistive component and a radiative component.

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