Negative Peak Voltage Detection for Enhanced FuelGauge Empty Voltage Prediction
First Claim
1. A method of estimating the end of life of a battery in a battery powered device having a predetermined available state of charge comprising:
- estimating an average battery voltage;
determining the negative peaks in the battery voltage relative to the average battery voltage during operation of the battery powered device and storing a largest negative peak in the battery voltage relative to the average battery voltage;
modifying the predetermined available state of charge based on the largest negative peak in the battery voltage relative to the average battery voltage.
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Abstract
Negative peak voltage detection for battery end of life estimations in fuel gauging is disclosed. Battery powered devices such cell phones and laptop computers create some noise in the form of negative excursions from the average output voltage of the battery which can cause the battery powered device to stop functioning. By negative peak detection relative to the average battery voltage, the end of life or discharged voltage condition can be altered in response to the negative peaks to obtain the maximum battery life without risk of the device inadvertently shutting down. Average output voltage of the battery may be taken as an estimated open circuit voltage or some other battery voltage. Various embodiments are disclosed.
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Citations
22 Claims
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1. A method of estimating the end of life of a battery in a battery powered device having a predetermined available state of charge comprising:
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estimating an average battery voltage; determining the negative peaks in the battery voltage relative to the average battery voltage during operation of the battery powered device and storing a largest negative peak in the battery voltage relative to the average battery voltage; modifying the predetermined available state of charge based on the largest negative peak in the battery voltage relative to the average battery voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of estimating the end of life of a battery in a battery powered device having a predetermined available state of charge comprising:
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estimating an average battery voltage; determining the ripple in the battery voltage relative to the average battery voltage during operation of the battery powered device and storing a largest ripple in the battery voltage relative to the average battery voltage; modifying the predetermined available state of charge based on the ripple in the battery voltage relative to the average battery voltage. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification