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Voltage-based fuel gauge on battery capacity

  • US 9,612,288 B2
  • Filed: 01/31/2014
  • Issued: 04/04/2017
  • Est. Priority Date: 01/31/2014
  • Status: Active Grant
First Claim
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1. A device to determine a state of a battery, the device comprising:

  • first and second nodes, the first node being configured to receive a supply current and a supply voltage from the battery;

    one or more transistors configured to provide a resistance between the first and the second node, the one or more transistors being configured to conduct the supply current between the first node and the second node, thereby generating a voltage between the first node and the second node;

    a measurement circuit configured to measure the voltage generated between the first node and the second node, the measurement circuit being further configured to measure the supply voltage; and

    a calculation circuit configured to;

    generate an estimate of the supply current based at least on the voltage measured between the first node and the second node and the resistance of the one or more transistors;

    generate an adjusted voltage measurement based on the measured supply voltage, the estimate of the supply current, and an estimate of a temperature coefficient of the battery, andgenerate an estimate of the state of charge of the battery based at least on the adjusted voltage measurement.

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