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Power system

  • US 8,853,892 B2
  • Filed: 04/19/2013
  • Issued: 10/07/2014
  • Est. Priority Date: 10/03/2008
  • Status: Active Grant
First Claim
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1. A method for reducing power consumption in a primary unit capable of transferring power to a secondary device, said secondary device separable from said primary unit, said method comprising the steps of:

  • detecting presence of an object within proximity of said primary unit by using a sense circuit with a bridge in the primary unit to detect a change in inductance due to the object;

    sending a pulse of power to said object in response to detecting presence of said object within proximity of said primary unit;

    determining whether a valid secondary device is present in proximity to said primary unit in response to sending said pulse of power to said object; and

    in response to a determination that a valid secondary device is not present, restricting power supplied to said primary unit.

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