VOLTAGE-BASED FUEL GAUGE ON BATTERY CAPACITY
First Claim
1. A device to determine a state of a battery, the device comprising:
- first and second nodes, the first node being configured to receive a supply current and a supply voltage from the battery;
one or more transistors configured to provide a resistance between the first and second node, the one or more transistors being configured to conduct the supply current between the first node and the second node, thereby generating a voltage between the first node and the second node;
a measurement circuit configured to measure the voltage generated between the first node and the second node, the measurement circuit being further configured to measure the supply voltage; and
a calculation circuit configured to;
generate an estimate of the supply current based at least on the voltage measured between the first node and the second node and the resistance of the one or more transistors; and
generate an estimate of the state of charge of the battery based at least on the measured supply voltage and the estimate of the supply current.
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Accused Products
Abstract
A device to determine a state of a battery is disclosed. One or more transistors provide a resistance between first and second nodes. The one or more transistors are configured to conduct a supply current from a battery between the first node and the second node. A measurement circuit measures the voltage generated between the first node and the second node. The measurement circuit further measures the supply voltage. A calculation circuit generates an estimate of the supply current based on the voltage measured between the first node and the second node and the resistance of the one or more transistors. The calculation circuit generates an estimate of the state of charge of the battery based on the measured supply voltage and the estimate of the supply current.
21 Citations
20 Claims
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1. A device to determine a state of a battery, the device comprising:
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first and second nodes, the first node being configured to receive a supply current and a supply voltage from the battery; one or more transistors configured to provide a resistance between the first and second node, the one or more transistors being configured to conduct the supply current between the first node and the second node, thereby generating a voltage between the first node and the second node; a measurement circuit configured to measure the voltage generated between the first node and the second node, the measurement circuit being further configured to measure the supply voltage; and a calculation circuit configured to; generate an estimate of the supply current based at least on the voltage measured between the first node and the second node and the resistance of the one or more transistors; and generate an estimate of the state of charge of the battery based at least on the measured supply voltage and the estimate of the supply current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for determining a state of a battery, the method comprising:
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receiving, at a first node, a supply current and a supply voltage from the battery; conducting the supply current between the first node and a second node via one or more transistors, thereby generating a voltage between the first node and the second node; measuring, with a first circuit, the voltage generated between the first node and the second node; measuring, with the first circuit, the supply voltage; generating, with a second circuit, an estimate of the supply current based at least on the voltage measured between the first node and the second node and a resistance of the one or more transistors; and generating, with the second circuit, an estimate of the state of charge of the battery based at least on the measured supply voltage and the estimate of the supply current. - View Dependent Claims (16, 17, 18, 19)
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20. A device for determining a state of a battery, the device comprising:
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means for providing a resistance between a first node and a second node, the providing means configured to conduct a supply current between the first node and the second node, thereby generating a voltage between the first node and the second node; means for measuring the voltage generated between the first node and the second node, the measuring means configured to measure a supply voltage of the battery; and means for generating an estimate of the supply current based at least on the voltage measured between the first node and the second node and the resistance of the providing means, the generating means configured to generate an estimate of the state of charge of the battery based at least on the measured supply voltage and the estimate of the supply current.
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Specification