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Device for inductive transmission of electrical energy

  • US 9,281,708 B2
  • Filed: 06/30/2010
  • Issued: 03/08/2016
  • Est. Priority Date: 07/14/2009
  • Status: Active Grant
First Claim
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1. A device for inductive transmission of electrical energy from a stationary unit having at least one primary inductor to a vehicle in a vicinity thereof having at least one secondary inductor, the stationary unit comprising a control unit for controlling a current supply to the primary inductor, the device comprising:

  • a plurality of measuring inductors positioned in at least one plane lying perpendicular to a main direction of a magnetic field produced by the primary inductor during transmission of electrical energy;

    at least one measuring device operatively-connected with the plurality of measuring inductors to measure a plurality of impedance values corresponding to different physical locations of the plurality of measuring inductors; and

    an evaluating device operatively-connected to the at least one measuring device, the evaluating device configured forcomparing the measured impedance values with stored impedance values to determine a physical location of measuring inductors having impedance values which are different than the stored impedance values,detecting the presence of an undesired electrically-conducting object and a location of the undesired electrically-conducting object using the determined physical locations when the undesired electrically-conducting object partially covers the primary inductor,detecting the presence of the vehicle using the determined locations and the impedance values when the secondary inductor is positioned proximate the primary inductor, andcausing the control unit to deactivate the current supply in the presence of the undesired electrically-conducting object.

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