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INPUT PARASITIC METAL DETECTION

  • US 20170063165A1
  • Filed: 11/14/2016
  • Published: 03/02/2017
  • Est. Priority Date: 02/08/2010
  • Status: Active Grant
First Claim
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1. A method of detecting an unacceptable amount of parasitic metal in proximity to a primary unit, the method comprising:

  • transferring contactless energy from a primary unit to a secondary device;

    measuring one or more characteristics of power in the primary unit to obtain a first value representative of the amount of power transferred from the primary unit;

    receiving information from the secondary device to obtain a second value representative of the amount of power received by the secondary device;

    estimating power loss in at least one of the primary unit and the secondary device, wherein the estimated power loss varies based on at least one of the amount of power transferred from the primary unit and the amount of power received by the secondary device;

    determining whether there is an unacceptable amount of parasitic metal in proximity to the primary unit based on the first value representative of the amount of power transferred from the primary unit, the second value representative of the amount of power received by the secondary device, and a third value representative of acceptable power loss, wherein acceptable power loss varies based on at least one of the first value and the second value.

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