BATTERY GAS-GAUGE CIRCUIT AND METHOD THEREOF
First Claim
1. A battery gas-gauge circuit, comprising:
- a sensing resistor;
a voltage-to-current conversion circuit, comprising;
a first conversion circuit, for obtaining a first voltage signal according to one of the two ends of the sensing resistor, and converting the first voltage signal to a first current signal; and
a second conversion circuit, for obtaining a second voltage signal according to another one of the two ends of the sensing resistor, and converting the second voltage signal to a second current signal;
a subtractor for generating a current difference signal according to the first current signal and the second current signal;
a comparator for outputting a comparison signal according to the current difference signal and a current dead-band;
a logic circuit for outputting a logic signal according to the comparison signal and a predetermined signal; and
a power-management unit for obtaining battery power according to the logic signal.
1 Assignment
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Accused Products
Abstract
A battery gas-gauge circuit and method thereof are provided. The battery gas-gauge circuit includes a sensing resistor, a voltage-to-current conversion circuit, a subtractor, a comparator, a logic circuit and a power-management unit. In the voltage-to-current conversion circuit, two conversion circuits thereof obtain two voltage signals according to the two ends of the sensing resistor, respectively, and convert the two voltage signals to two current signals correspondingly. The subtractor generates a current difference signal according to the two current signals. The comparator outputs a comparison signal according to the current difference signal and a current dead-band. The logic circuit outputs a logic signal according to the comparison signal and a predetermined signal. The power-management unit determines battery power according to the logic signal.
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Citations
13 Claims
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1. A battery gas-gauge circuit, comprising:
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a sensing resistor; a voltage-to-current conversion circuit, comprising; a first conversion circuit, for obtaining a first voltage signal according to one of the two ends of the sensing resistor, and converting the first voltage signal to a first current signal; and a second conversion circuit, for obtaining a second voltage signal according to another one of the two ends of the sensing resistor, and converting the second voltage signal to a second current signal; a subtractor for generating a current difference signal according to the first current signal and the second current signal; a comparator for outputting a comparison signal according to the current difference signal and a current dead-band; a logic circuit for outputting a logic signal according to the comparison signal and a predetermined signal; and a power-management unit for obtaining battery power according to the logic signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for use in a battery gas-gauge circuit which includes a sensing resistor, the method comprising:
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obtaining a first voltage signal according to one of the two ends of the sensing resistor, and converting the first voltage signal to a first current signal; and obtaining a second voltage signal according to another one of the two ends of the sensing resistor, and converting the second voltage signal to a second current signal; generating a current difference signal according to the first current signal and the second current signal; outputting a comparison signal according to the current difference signal and a current dead-band; outputting a logic signal according to the comparison signal and a predetermined signal; and obtaining battery power according to the logic signal. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification