Wireless energy transfer

  • US 9,444,265 B2
  • Filed: 05/22/2012
  • Issued: 09/13/2016
  • Est. Priority Date: 07/12/2005
  • Status: Active Grant
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First Claim
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1. An energy transferring system, comprising:

  • a source-side resonator for receiving an energy, wherein the source-side resonator has a first resonant frequency;

    an intermediate resonant module having a second resonant frequency substantially the same with the first resonant frequency, wherein the energy on the source-side resonator is coupled to the intermediate resonant module, such that non-radiative energy transfer is performed between the source-side resonator and the intermediate resonant module, and the coupling between the source-side resonator and the intermediate resonant module corresponds to a first coupling coefficient; and

    a device-side resonator having a third resonant frequency substantially the same with the second resonant frequency, wherein the energy coupled to the intermediate resonant module is further coupled to the device-side resonator, such that non-radiative energy transfer is performed between the intermediate resonant module and the device-side resonator, and the coupling between the intermediate resonant module and the device-side resonator corresponds to a second coupling coefficient;

    wherein the coupling between the source-side resonator and the device-side resonator corresponds to a third coupling coefficient,wherein the source-side resonator, the intermediate resonant module, and the device-side resonator are movable relative to one another, andwherein;

    the source-side resonator has a resonant frequency ω

    1, an intrinsic loss rate Γ

    1, and an intrinsic quality factor Q1

    1/(2Γ

    1);

    the device-side resonator has a resonant frequency ω

    2, an intrinsic loss rate Γ

    2, and an intrinsic quality factor Q2

    2/(2Γ

    2);

    the intermediate resonant module has a resonant frequency ω

    3, an intrinsic loss rate Γ

    3, and an intrinsic quality factor Q3

    3/(2Γ

    3),the first coupling coefficient is κ

    1 and the second coupling coefficient is κ

    2, and wherein the intrinsic loss rates satisfy κ

    1/√

    {square root over (Γ

    1Γ

    3)}>

    1 and κ

    2/√

    {square root over (Γ

    3Γ

    2)}>

    1 for a range of distances between the source-side resonator, the intermediate resonant module, and the device-side resonator.

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