State of charge indicator for battery
First Claim
1. A state of charge indicator system for a battery, which comprises:
- a current sensing circuit for sensing and converting charge or discharge current of the battery into a bipolar voltage with one polarity representative of charge current and an opposite polarity representative of discharge current;
a counter circuit for that counts battery charge;
a charge/discharge circuit operatively connected to said current sensing circuit and said counter circuit that detects the voltage polarity from the current sensing circuit and sets the counter circuit to a count mode with an up or down count for a respective charge or discharge; and
a reset circuit operative with the current sensing circuit, counter circuit and charge/discharge circuit for resetting the counter circuit to an actual sate of charge at the battery after a delay when said battery is idle representative of a battery open circuit voltage.
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Accused Products
Abstract
A state of charge indicator includes a current sensing circuit for sensing and converting charge or discharge current of a battery into a bipolar voltage. A counter circuit counts battery charge. A charge/discharge circuit is operatively connected to the current sensing and counter circuits and detects the voltage polarity from the current sensing circuit and sets the counter circuit to a count mode with an up or down count for a respective charge or discharge. A reset circuit is operative with the current sensing circuit, counter circuit and charge/discharge circuit for resetting the counter circuit to an actual state-of-charge of the battery after delay when the battery is idle representative of a battery open circuit voltage.
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Citations
20 Claims
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1. A state of charge indicator system for a battery, which comprises:
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a current sensing circuit for sensing and converting charge or discharge current of the battery into a bipolar voltage with one polarity representative of charge current and an opposite polarity representative of discharge current;
a counter circuit for that counts battery charge;
a charge/discharge circuit operatively connected to said current sensing circuit and said counter circuit that detects the voltage polarity from the current sensing circuit and sets the counter circuit to a count mode with an up or down count for a respective charge or discharge; and
a reset circuit operative with the current sensing circuit, counter circuit and charge/discharge circuit for resetting the counter circuit to an actual sate of charge at the battery after a delay when said battery is idle representative of a battery open circuit voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A state of charge indicator system for a battery, which comprises:
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a counter circuit that counts battery charge;
a voltage measuring circuit operatively connected to said counter circuit for measuring battery terminal voltage and transmitting a digital signal representative of said battery terminal voltage to said counter circuit; and
a circuit operative with said counter circuit and voltage measuring circuit for monitoring current and detecting when the battery has been idle, indicative that the battery has neither been charged nor discharged for a period of time sufficient for allowing the battery to settle into an open circuit voltage state and resetting the counter circuit to an actual state of charge of the battery. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method of indicating a state of charge for a battery, which comprises:
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converting the charge or discharge current of the battery into a bipolar voltage with one polarity representative of charge current and an opposite polarity representative of discharge current;
counting battery charge within a counter circuit;
detecting voltage polarity of the battery and setting the counter circuit to a count mode with an up or down count for respective charge or discharge; and
resetting the counter circuit to an actual state of charge of the battery after a delay when said battery is idle representative of the battery open circuit voltage - View Dependent Claims (19, 20)
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Specification