System and method of battery capacity reporting
First Claim
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1. A method of determining the available battery capacity of a battery comprising:
- determining a battery voltage and a current charge state of the battery;
determining a target battery capacity based on the determined battery voltage and the determined current charge state;
comparing the determined target battery capacity to a previous battery capacity; and
adjusting the target battery capacity if the comparison is not indicative of the determined charge state.
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Abstract
A method and system for accurately reporting battery capacity is disclosed herein. The disclosed method and system prevent the reporting of discontinuous capacity values resulting from starting or stopping recharge cycles. The disclosed method and system prevent over or under reporting of battery capacity due to the transition between charge and discharge curves in a battery model.
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Citations
18 Claims
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1. A method of determining the available battery capacity of a battery comprising:
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determining a battery voltage and a current charge state of the battery;
determining a target battery capacity based on the determined battery voltage and the determined current charge state;
comparing the determined target battery capacity to a previous battery capacity; and
adjusting the target battery capacity if the comparison is not indicative of the determined charge state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for determining the capacity of a battery having a memory for storing a previous battery capacity value, the system comprising:
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voltage reading means operatively connected to the battery for determining the voltage of the battery;
charge state determining means operatively connected to the battery for determining the charge state of the battery;
target capacity determining means, operatively connected to the voltage reading means for receiving the determined voltage and to the charge state determining means for receiving the determined charge state, for computing a target battery capacity based on the determined voltage and the determined charge state;
a comparator, operatively connected to the memory for receiving the previous battery capacity value and to the target capacity determining means for receiving the target battery capacity, for generating a comparison signal representative of the comparison of the previous battery capacity value and the target battery capacity; and
target capacity adjusting means operatively connected to the comparator for receiving the comparison signal, to the target capacity determining means for receiving the determined target battery capacity and to the charge state determining means for receiving the determined charge state, for adjusting the determined target battery capacity if the comparison signal is not indicative of the determined charge state, and for storing the adjusted target battery capacity in the memory. - View Dependent Claims (14, 15, 16, 17)
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18. A handheld device having a system for determining the capacity of a battery having a memory for storing a previous battery capacity value, the system comprising:
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voltage reading means operatively connected to the battery for determining the voltage of the battery;
charge state determining means operatively connected to the battery for determining the charge state of the battery;
target capacity determining means, operatively connected to the voltage reading means for receiving the determined voltage and to the charge state determining means for receiving the determined charge state, for computing a target battery capacity based on the determined voltage and the determined charge state;
a comparator, operatively connected to the memory for receiving the previous battery capacity value and to the target capacity determining means for receiving the target battery capacity, for generating a comparison signal representative of the comparison of the previous battery capacity value and the target battery capacity; and
target capacity adjusting means operatively connected to the comparator for receiving the comparison signal, to the target capacity determining means for receiving the determined target battery capacity and to the charge state determining means for receiving the determined charge state, for adjusting the determined target battery capacity if the comparison signal is not indicative of the determined charge state, and for storing the adjusted target battery capacity in the memory.
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Specification