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Electronic control method for a planar inductive battery charging apparatus

  • US RE45,651 E1
  • Filed: 07/23/2014
  • Issued: 08/11/2015
  • Est. Priority Date: 11/09/2007
  • Status: Active Grant
First Claim
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1. A planar battery charging system comprising;

  • a primary power transmission side formed of an array of primary windings adapted to generate magnetic flux substantially perpendicular to a charging surface; and

    a secondary power receiving side comprising a secondary winding associated with a battery to be charged and being adapted to receive said magnetic flux when a said secondary winding is placed on said charging surface;

    wherein a said primary winding is energized by a control circuit comprising a first-stage power converter and a second-stage power inverter, both being on the primary power transmission side, wherein the first-stage power converter is controlled to provide a controlled variable DC-link voltage on the primary power transmission side, and wherein the second-stage power inverter generates a controlled fixed-frequency constant AC current to said primary winding.

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