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Inductive battery charger system with primary transformer windings formed in a multi-layer structure

  • US 7,164,255 B2
  • Filed: 12/10/2004
  • Issued: 01/16/2007
  • Est. Priority Date: 06/10/2002
  • Status: Active Grant
First Claim
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1. A battery charging system comprising a charging module comprising a primary charging circuit and being formed with a planar charging surface adapted to receive an electronic device to be charged, wherein said primary charging circuit includes a plurality of transformer windings formed in a multi-layer structure comprising at least two layers, each of said layers comprising a regular array of primary windings, each said primary winding being substantially parallel to said planar charging surface, the array of a first layer of said layers being offset relative to the array of a second layer of said layers, wherein said primary windings are provided with electromagnetic shielding on the side of said multi-layer structure opposite from said planar charging surface, and wherein said electronic device is formed with a secondary winding.

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