Wireless energy transfer with resonator arrays for medical applications

  • US 8,901,779 B2
  • Filed: 10/21/2011
  • Issued: 12/02/2014
  • Est. Priority Date: 09/27/2008
  • Status: Active Grant
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First Claim
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1. A medical device wireless power system, comprising:

  • a power supply, the power supply configured to supply power at a rate sufficient to charge a rechargeable battery of a medical device;

    an array of electromagnetic resonators to couple with the power supply, the array comprising at least a first electromagnetic resonator having a mode with a resonant frequency ω

    1, an intrinsic loss rate Γ

    1, and a first Q-factor Q1

    1 /

    1, the electromagnetic resonators of the array being placed in different positions and orientations to distribute power over an area and to accommodate positional and rotational uncertainty of the rechargeable battery, including at least one of the electromagnetic resonators of the array being placed such that its dipole moment is perpendicular to that of another of the electromagnetic resonators of the array;

    an enclosure for the rechargeable battery; and

    control circuitry configured to charge the rechargeable battery, while in the enclosure, using non-radiative wireless power transfer via the array of electromagnetic resonators and a second electromagnetic resonator associated with the rechargeable battery having a mode with a resonant frequency ω

    2, an intrinsic loss rate Γ

    2, and a second Q-factor Q2

    2/2Γ

    2;

    wherein the square root of the product of the respective Q factors is greater than 100.

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