Battery gas-gauge circuit and method thereof
First Claim
1. A battery gas-gauge circuit for measuring battery power of a battery of an electronic device, comprising:
- a sensing resistor, wherein a first voltage signal and a second voltage signal at two ends of the sensing resistor are in response to a battery current between the battery and the sensing resistor;
a voltage-to-current conversion circuit for converting the first voltage signal and the second voltage signal to a first current signal and a second current signal, respectively;
a determination circuit for determining whether the battery current is a leakage current, based on the first current signal, the second current signal, a current dead-band and an operation mode of the electronic device; and
a power-management unit for recording the battery current and obtaining the battery power of the battery according to the battery current and a power-saving mode current, in response to the determination circuit determining that the battery current is a leakage current;
wherein the operation mode of the electronic device corresponds to a predetermined signal, and the predetermined signal causes the power-management unit to stop recording the battery current when the electronic device leaves a power saving mode.
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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.
15 Citations
16 Claims
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1. A battery gas-gauge circuit for measuring battery power of a battery of an electronic device, comprising:
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a sensing resistor, wherein a first voltage signal and a second voltage signal at two ends of the sensing resistor are in response to a battery current between the battery and the sensing resistor; a voltage-to-current conversion circuit for converting the first voltage signal and the second voltage signal to a first current signal and a second current signal, respectively; a determination circuit for determining whether the battery current is a leakage current, based on the first current signal, the second current signal, a current dead-band and an operation mode of the electronic device; and a power-management unit for recording the battery current and obtaining the battery power of the battery according to the battery current and a power-saving mode current, in response to the determination circuit determining that the battery current is a leakage current; wherein the operation mode of the electronic device corresponds to a predetermined signal, and the predetermined signal causes the power-management unit to stop recording the battery current when the electronic device leaves a power saving mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for use in a battery gas-gauge circuit which measures battery power of a battery of an electronic device, the battery gas-gauge circuit including a sensing resistor, the method comprising:
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obtaining a first voltage signal and a second voltage signal at two ends of the sensing resistor in response to a battery current between the battery and the sensing resistor; converting the first voltage signal and the second voltage signal to a first current signal and a second current signal, respectively; determining whether the battery current is a leakage current based on the first current signal, the second current signal, a current dead-band and an operation mode of the electronic device; and recording the battery current and obtaining the battery power of the battery according to the battery current and a power-saving mode current in response to a determination in said determining step that the battery current is a leakage current, wherein the operation mode of the electronic device corresponds to a predetermined signal, and the predetermined signal causes recording of the battery current to stop when the electronic device leaves the power saving mode. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification