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 comprising:
- estimating an average battery voltage during a discharge cycle of the battery;
determining the negative peaks in the battery voltage relative to the estimated average battery voltage during operation of the battery powered device and storing a largest negative peak in the battery voltage relative to the estimated average battery voltage;
modifying the estimated average battery voltage based on the largest negative peak in the battery voltage relative to the estimated average battery voltage; and
estimating the battery end of life based on the modified estimated 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.
10 Citations
27 Claims
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1. A method of estimating the end of life of a battery in a battery powered device comprising:
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estimating an average battery voltage during a discharge cycle of the battery; determining the negative peaks in the battery voltage relative to the estimated average battery voltage during operation of the battery powered device and storing a largest negative peak in the battery voltage relative to the estimated average battery voltage; modifying the estimated average battery voltage based on the largest negative peak in the battery voltage relative to the estimated average battery voltage; and estimating the battery end of life based on the modified estimated average battery voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11, 27)
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9. The method of clam 1 wherein modifying the estimated average battery voltage is based on the largest negative peak in the battery voltage relative to the estimated average battery voltage comprises subtracting the largest negative peak in the battery voltage relative to the estimated average battery voltage from the estimated average battery voltage.
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10. The method of clam 1 wherein modifying the estimated average battery voltage is based on the largest negative peak in the battery voltage relative to the estimated average battery voltage comprises subtracting a fraction of the largest negative peak in the battery voltage relative to the estimated average battery voltage.
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12. A method of estimating the end of life of a battery in a battery powered device comprising:
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estimating an average battery voltage during a discharge cycle of the battery; determining the ripple in the battery voltage relative to the estimated average battery voltage during operation of the battery powered device and storing a largest ripple in the battery voltage relative to the estimated average battery voltage; modifying the estimated average battery voltage based on the ripple in the battery voltage relative to the estimated average battery voltage; and estimating the battery end of life based on the modified estimated average battery voltage. - View Dependent Claims (13, 14, 15, 16, 17, 20)
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18. The method of clam 12 wherein modifying the estimated average battery voltage is based on the largest ripple in the battery voltage relative to the estimated average battery voltage comprises subtracting the largest ripple in the battery voltage relative to the estimated average battery voltage from the estimated average battery voltage.
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19. The method of clam 12 wherein modifying the estimated average battery voltage is based on the largest ripple in the battery voltage relative to the estimated average battery voltage comprises subtracting a fraction of the largest ripple in the battery voltage relative to the estimated average battery voltage.
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21. A method of estimating the end of life of a battery in a battery powered device comprising:
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estimating a state of charge of the battery by estimating an open circuit voltage of the battery during a discharge cycle using an RC battery voltage model; sensing negative peaks in the battery voltage relative to the estimated open circuit voltage of the battery during the discharge cycle of the battery and storing a largest negative peak in the battery voltage relative to the open circuit voltage of the battery; modifying the estimated state of charge of the battery by subtracting a fraction of the largest negative peak in the battery voltage from the estimated open circuit voltage of the battery and determining the modified state of charge of the battery to estimate the end of life of the battery. - View Dependent Claims (22, 23, 24)
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25. The method of clam 21 wherein modifying the estimated state of charge of the battery based on the largest negative peak in the battery voltage relative to the average battery voltage comprises subtracting the largest negative peak in the battery voltage from the average battery voltage from the average battery voltage.
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26. The method of clam 1 wherein modifying the estimated state of charge of the battery based on the largest negative peak in the battery voltage relative to the average battery voltage comprises subtracting a fraction of the largest negative peak in the battery voltage from the average battery voltage.
Specification