VOLTAGE MODE FUEL GAUGE
First Claim
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1. A circuit comprising:
- a sensor providing a digital signal responsive to a battery voltage on a battery terminal of a battery; and
a processor coupled to the sensor and configured to calculate a state of charge of the battery based on the digital signal at a first time, the digital signal at a second time, and a stored battery profile of open circuit voltage as a function of state of charge at the second time.
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Abstract
In one embodiment, a circuit comprises a sensor providing a digital signal responsive to a battery voltage on a battery terminal of a battery. The sensor can be an analog-to-digital convertor. A processor is coupled to the sensor and is configured to calculate a state of charge of the battery based on the digital signal at a first time, the digital signal at a second time, and a stored battery profile of open circuit voltage as a function of state of charge at the second time.
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Citations
20 Claims
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1. A circuit comprising:
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a sensor providing a digital signal responsive to a battery voltage on a battery terminal of a battery; and a processor coupled to the sensor and configured to calculate a state of charge of the battery based on the digital signal at a first time, the digital signal at a second time, and a stored battery profile of open circuit voltage as a function of state of charge at the second time. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A circuit comprising:
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an analog-to-digital convertor providing a first digital signal responsive to an open circuit battery voltage on a battery terminal at an initial detection time and providing a plurality of second digital signals responsive to a plurality of battery voltages on the battery terminal for each of a plurality of detection intervals; and a processor coupled to the analog-to-digital convertor and configured to calculate a state of charge of a battery based on the first digital signal, the plurality of second digital signals, and a stored battery profile of open circuit voltage as a function of state of charge. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method comprising:
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detecting an initial open circuit battery voltage at a first time; detecting a second open circuit battery voltage at a second time; and calculating a state of charge of a battery based on the initial open circuit battery voltage, the second open circuit battery voltage, and a stored battery profile of open circuit voltage as a function of state of charge. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification