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Single-structure wireless charging receiver systems having multiple receiver coils

  • US 10,491,041 B2
  • Filed: 09/05/2018
  • Issued: 11/26/2019
  • Est. Priority Date: 09/06/2017
  • Status: Active Grant
First Claim
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1. A wireless charging receiver system, comprising:

  • a primary coil formed of a plurality of turns of stranded wire wound about a primary axis and configured to receive wireless power from time-varying magnetic fields generated at a first frequency and in a first direction;

    a ferromagnetic shield disposed over at least two adjacent surfaces of the primary coil and over a portion of entire circumference of the at least two adjacent surfaces such that an annular segment of the primary coil is uncovered by the ferromagnetic shield; and

    a secondary coil formed of a plurality of turns of stranded wire wound about a secondary axis disposed along a circumference centered around the primary axis, the secondary coil covers overlapping portions of the ferromagnetic shield and the primary coil and is configured to receive wireless power from time-varying magnetic fields generated at a second frequency different from the first frequency and in a second direction different from the first direction.

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