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System, method and apparatus for reducing the height of bipolar transmitters and/or receivers in electric vehicle charging

  • US 10,083,792 B2
  • Filed: 05/14/2014
  • Issued: 09/25/2018
  • Est. Priority Date: 05/14/2014
  • Status: Active Grant
First Claim
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1. An apparatus for wireless power transfer, comprising:

  • a ferromagnetic layer comprising at least one first portion having a first thickness and a plurality of second portions, each having a second thickness less than the first thickness;

    a first coil having a first section that rests on the at least one first portion, a plurality of second sections, each of which rests on one of the plurality of second portions of the ferromagnetic layer, and a third section that rests on the at least one first portion, the third section positioned between the plurality of second sections, the plurality of second sections of the first coil not coplanar with the first section, and the first coil configured to be driven with a first current; and

    a second coil overlapping the plurality of second sections of the first coil and configured to be driven with a second current different from the first current,the first and second coils configured to generate a magnetic field that is adjusted based on varying a magnitude or a phase of at least one of the first and second currents.

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