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Method for accurate battery run time estimation utilizing load-condition voltage

  • US 8,660,808 B2
  • Filed: 12/02/2008
  • Issued: 02/25/2014
  • Est. Priority Date: 12/02/2008
  • Status: Active Grant
First Claim
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1. A method for accurately estimating a run time of a battery utilized by an electronic device, the method comprising:

  • determining a starting battery capacity by measuring only an open-circuit voltage of said battery, said open-circuit voltage measured by a voltage-measuring circuit;

    determining whether an active operation performed by said electronic device requires estimating said run time of said battery;

    determining a battery capacity decline rate utilizing a load-condition voltage of said battery measured by said voltage-measuring circuit;

    determining a low-voltage-alarm battery capacity by looking up and retrieving said low-voltage-alarm battery capacity from a plurality of low-voltage alarm battery capacities based on said low-voltage-alarm battery capacity being associated with said active operation, during said active operation of said electronic device;

    utilizing said starting battery capacity, said battery capacity decline rate, and said low-voltage-alarm battery capacity to estimate said run time of said battery.

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