Circuit and method of operation for an electrical power supply

  • US 8,541,983 B2
  • Filed: 07/01/2011
  • Issued: 09/24/2013
  • Est. Priority Date: 02/21/2003
  • Status: Active Grant
First Claim
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1. A portable electronic device, comprising:

  • a switch configured to control a supply of power to a rechargeable battery;

    a controller configured to receive USB power from an external source and supply power to the portable electronic device; and

    a sensing circuit configured to determine power supplied to the portable electronic device,the controller responsive to the sensing circuit and configured to control the switch to limit battery charging from the external source such that sufficient power is provided for operation of the portable electronic device.

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