Circuit for determining the remaining operating life of a system
First Claim
1. Gas gauge circuitry for monitoring parameters associated with a rechargeable power source, said gas gauge circuitry comprising:
- monitoring circuitry coupled to the rechargeable power source, said monitoring circuitry for monitoring at least one parameter relating to the rechargeable power source; and
a timekeeper coupled to said monitoring circuitry, said timekeeper for providing a timing signal to said monitoring circuitry;
wherein said timekeeper generates an end-of-charge time stamp in response to completion of the charging of the rechargeable power source, said end-of-charge time stamp coding the time when the completion of the charging has occurred.
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Accused Products
Abstract
Gas gauge circuitry for monitoring and accumulating various operating parameters of a rechargeable battery with selected parameters being used to determine the remaining operating life of a rechargeable battery, and includes a current monitor for measuring the current flow into and out of the rechargeable battery. An integrated current accumulator is connected to the current monitor and is used to maintain a net accumulated total of current flowing into and out of the rechargeable battery. A charging current accumulator, which is also coupled to the current meter is used to maintain the total current flowing into the rechargeable battery, while a discharging current accumulator is used to maintain the total current flowing out of the rechargeable battery. A highly accurate, oscillatory circuit is used to drive the accumulators to increase the accuracy of the gas gauge functions therefrom.
47 Citations
26 Claims
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1. Gas gauge circuitry for monitoring parameters associated with a rechargeable power source, said gas gauge circuitry comprising:
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monitoring circuitry coupled to the rechargeable power source, said monitoring circuitry for monitoring at least one parameter relating to the rechargeable power source; and a timekeeper coupled to said monitoring circuitry, said timekeeper for providing a timing signal to said monitoring circuitry; wherein said timekeeper generates an end-of-charge time stamp in response to completion of the charging of the rechargeable power source, said end-of-charge time stamp coding the time when the completion of the charging has occurred. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for monitoring at least one operating parameter of a system, the system including a rechargeable power source, the parameter used to calculate the remaining life expectancy of the system, said device comprising:
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a first accumulator for accumulating values associated with a selected one of the at least one operating parameters of the system; and a timing device coupled to said first accumulator, said timing device for generating a timing signal to time said first accumulator; wherein said timing device further generates a disconnect time stamp, said disconnect time stamp coding a disconnect time of said rechargeable power source from a device. - View Dependent Claims (11, 12, 13, 14, 15)
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16. In a rechargeable battery system having a rechargeable battery with a current meter to measure the current flow into and out of the rechargeable battery, an electronic device for calculating the charge of the rechargeable battery, said electronic device comprising:
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a first current accumulator coupled to the current meter for receiving at least indications of the measured current flow into and out of the rechargeable battery, said first current accumulator for accumulating the net total of current flowing into and out of the rechargeable battery; a timing device coupled to said first accumulator, said timing device for generating a timing signal to time said first current accumulator, said timing device further for generating a time stamp; and a storage device for storing said generated time stamp wherein said time stamp coding a time at which an event within the battery system occurs. - View Dependent Claims (17, 18, 19)
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20. In a rechargeable battery system having a rechargeable battery with a current meter to measure the current flow into and out of the rechargeable battery, an electronic device for calculating the charge of the rechargeable battery, said electronic device comprising:
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a discharge current accumulator coupled to the current meter for receiving at least indications of the measured current flow out of the rechargeable battery, said discharge current accumulator for accumulating the total current flowing out of the rechargeable battery; and a timekeeping device coupled to said discharge accumulator, said timekeeping device for generating a timing signal to time said discharge current accumulator, said timekeeping device further generating a time stamp coding the time an event within the battery system occurs. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification