Battery characterization technique accounting for offset error
First Claim
1. A system for operating a rechargeable battery, said system comprising:
- means for charging said rechargeable battery to a predetermined maximum voltage;
means for determining a first dynamic charging range for the rechargeable battery for a first plurality of charging cycles; and
means for calculating an offset error for said determining means while there is no more than a relatively low load on the rechargeable battery,wherein the means for charging comprises;
means for delivering a predetermined charging current to the battery until the battery is charged to the predetermined maximum voltage; and
means for successively delivering progressively smaller charging currents to the battery until a predetermined minimum charging current of the progressively smaller charging currents is reached, wherein each of progressively smaller charging currents is delivered to the battery until the battery is charged to the predetermined maximum voltage.
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Abstract
The present invention provides a system and method for operating a rechargeable battery, the system comprising: current maintaining device for maintaining a predetermined current to the rechargeable battery until the rechargeable battery reaches a predetermined maximum voltage; voltage maintaining device for maintaining a predetermined voltage to the rechargeable battery until a predetermined minimum current is delivered to the rechargeable battery; determining device for determining a cyclical charge value delivered to the rechargeable battery by the current maintaining device and the voltage maintaining device during a cycle; and a correction device for correcting the determining device when charge is not being delivered to the rechargeable battery, on the basis of the charge value.
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Citations
32 Claims
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1. A system for operating a rechargeable battery, said system comprising:
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means for charging said rechargeable battery to a predetermined maximum voltage; means for determining a first dynamic charging range for the rechargeable battery for a first plurality of charging cycles; and means for calculating an offset error for said determining means while there is no more than a relatively low load on the rechargeable battery, wherein the means for charging comprises; means for delivering a predetermined charging current to the battery until the battery is charged to the predetermined maximum voltage; and means for successively delivering progressively smaller charging currents to the battery until a predetermined minimum charging current of the progressively smaller charging currents is reached, wherein each of progressively smaller charging currents is delivered to the battery until the battery is charged to the predetermined maximum voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A battery charger for a rechargeable battery of an electronic device, the battery charger comprising:
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a charge controller configured to charge the rechargeable battery during a cycle; and a measuring circuit configured to measure parametric data during the cycle, and to calculate an offset error of the measuring circuit while no load is placed on the rechargeable battery, wherein the measuring circuit comprises; a differential amplifier configured to amplify voltage drop across a sense resistor, and to output a current signal proportional to current flowing into or out of the rechargeable battery based thereon; an integrator configured to integrate the current signals from the differential amplifier; a detection block configured to output a voltage signal when the integration of the integrator reaches a threshold value; and digital logic configured to count the number of received output voltage signals. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A battery charger for a rechargeable battery of an electronic device, the battery charger comprising:
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a charge controller configured to charge the rechargeable battery during a first cycle; a measuring circuit configured to measure one or more parametric data during the first cycle, and to calculate an offset error of the measuring circuit while no more than a relatively low load is placed on the rechargeable battery, wherein the measuring circuit comprises; a differential amplifier configured to amplify voltage drop across a sense resistor, and to output a current signal proportional to current flowing into or out of the rechargeable battery based thereon; an integrator configured to integrate the current signals from the differential amplifier; a detection block configured to receive an output voltage from the integrator, and configured to output detection signals each indicating that a quantized unit of charge has been processed; and digital logic configured to count the number of received output detection signals. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification