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Circuit and method of operation for an electrical power supply

  • US 7,906,940 B2
  • Filed: 08/20/2010
  • Issued: 03/15/2011
  • Est. Priority Date: 02/21/2003
  • Status: Active Grant
First Claim
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1. A battery charging circuit comprising:

  • a switch having an output connected to a rechargeable battery and configurable to isolate the rechargeable battery from a portable device;

    a battery charge controller configured to receive power from an external source and supply output power to the portable device; and

    a voltage sensing circuit configured to;

    measure the voltage drop across the battery charge controller; and

    respond to the voltage drop across the battery charge controller by modulating the switch to control the quantity of current supplied to the rechargeable battery such that the portable device receives a predetermined amount of power to operate and the rechargeable battery receives a reminder of the power available from the battery charge controller.

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