Wireless energy transfer for rechargeable batteries

  • US 9,343,922 B2
  • Filed: 06/27/2012
  • Issued: 05/17/2016
  • Est. Priority Date: 06/27/2012
  • Status: Active Grant
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First Claim
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1. An assembly configured to receive power wirelessly through an oscillating magnetic field generated by a wireless power source, the assembly comprising:

  • a first resonator coil having a first characteristic size and configured to couple to a first electrical load; and

    a second resonator coil having a second characteristic size and positioned so that a minimum distance between the first resonator coil and the second resonator coil is less than half as large as a larger of the first and second characteristic sizes,wherein the second resonator coil is oriented with respect to the first resonator coil so that a value of a coupling parameter k between the first and second resonator coils is smaller by a factor of at least two than a maximum value of k for any orientation of the second resonator coil for the same minimum distance between the first and second resonator coils.

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