Battery fuel gauge circuit
First Claim
1. A detection circuit configured to detect a remaining battery charge of a battery, and to be mounted on an electronic device comprising at least the battery, a processor configured to integrally control the electronic device, and a communication unit, the detection circuit comprising:
- an A/D converter configured to sample a magnitude of a current discharged from the battery, and to convert a magnitude of the current thus sampled into a digital current value;
an interface circuit configured to receive, from the processor, control data which indicates a period in which there is an increase in current discharged from the battery;
a control unit configured to raise a sampling frequency of the A/D converter based upon control data in the period in which there is an increase in the current; and
an integrator circuit configured to integrate the current value acquired by the A/D converter so as to generate an integrated value and output the integrated value to the interface circuit,wherein the control unit judges whether the electronic device is in a non-communicating state or in a communicating state based upon the current value that corresponds to the battery current, and the interface circuit supplies the integrated value to the processor only while in the communicating state; and
wherein the communicating state is a transmit period or receive period of the electronic device.
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Accused Products
Abstract
A detection circuit is mounted on an electronic device having a communication function, including at least a battery, a CPU, and a communication unit, and is configured to detect the remaining battery charge. An A/D converter performs sampling of a magnitude of a current IBAT discharged from the battery, and converts the current IBAT thus sampled into a digital current value. An interface circuit receives, from the CPU, control data which indicates a period in which there is an increase in the current discharged from the battery. Based upon the control data, a control unit raises the sampling frequency of the A/D converter in the period in which there is an increase in the current IBAT.
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Citations
9 Claims
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1. A detection circuit configured to detect a remaining battery charge of a battery, and to be mounted on an electronic device comprising at least the battery, a processor configured to integrally control the electronic device, and a communication unit, the detection circuit comprising:
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an A/D converter configured to sample a magnitude of a current discharged from the battery, and to convert a magnitude of the current thus sampled into a digital current value; an interface circuit configured to receive, from the processor, control data which indicates a period in which there is an increase in current discharged from the battery; a control unit configured to raise a sampling frequency of the A/D converter based upon control data in the period in which there is an increase in the current; and an integrator circuit configured to integrate the current value acquired by the A/D converter so as to generate an integrated value and output the integrated value to the interface circuit, wherein the control unit judges whether the electronic device is in a non-communicating state or in a communicating state based upon the current value that corresponds to the battery current, and the interface circuit supplies the integrated value to the processor only while in the communicating state; and wherein the communicating state is a transmit period or receive period of the electronic device. - View Dependent Claims (2, 3, 4, 7)
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5. A detection circuit configured to detect the remaining battery charge of a battery, and to be mounted on an electronic device comprising at least the battery, a processor configured to integrally control the electronic device, and a communication unit, the detection circuit comprising:
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an amplifier configured to be capable of changing its operation speed, and to amplify a detection voltage that corresponds to a current discharged from the battery; an A/D converter configured to sample an output signal of the amplifier, and to convert the output signal thus sampled into a digital current value; an interface circuit configured to receive, from the processor, control data which indicates a period in which there is an increase in current discharged from the battery; a control unit configured to raise the operation speed of the amplifier in the period in which there is an increase in the current; and an integrator circuit configured to integrate the current value acquired by the A/D converter so as to generate an integrated value and output the integrated value to the interface circuit, wherein the control unit judges whether the electronic device is in a non-communicating state or in a communicating state based upon the current value that corresponds to the battery current, and the interface circuit supplies the integrated value to the processor only while in the communicating state; and wherein the communicating state is a transmit period or receive period of the electronic device. - View Dependent Claims (6)
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8. A method for detecting the remaining battery charge of a battery that is mounted on an electronic device that comprises at least the battery, a processor configured to integrally control the electronic device, and a communication unit, the method comprising:
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sampling a magnitude of a current discharged from the battery and converting a magnitude of the current thus sampled into a digital current value, which are performed by an A/D converter; integrating the current value acquired by the A/D converter so as to generate an integrated value and outputting the integrated value, generating control data which indicates a period in which there is an increase in current discharged from the battery, which is performed by the processor; raising, based upon the control data, a sampling frequency of the A/D converter in the period in which there is an increase in the current; determining whether the electronic device is in a non-communicating state or in a communicating state based upon the current value that corresponds to the battery current; and supplying the integrated value to the processor only while in the communicating state; wherein the communicating state is a transmit period or receive period of the electronic device.
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9. A method for detecting the remaining battery charge of a battery that is mounted on an electronic device that comprises at least the battery, a processor configured to integrally control the electronic device, and a communication unit, the method comprising:
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amplifying a detection voltage that corresponds to a current discharged from the battery, which is performed by the amplifier; sampling an output signal of the amplifier and converting the output signal thus sampled into a digital current value; integrating the current value acquired by the A/D converter so as to generate an integrated value and outputting the integrated value, generating control data which indicates a period in which there is an increase in current discharged from the battery, which is performed by the processor; raising, based upon the control data, the operation speed of the amplifier in the period in which there is an increase in the current; determining whether the electronic device is in a non-communicating state or in a communicating state based upon the current value that corresponds to the battery current; and supplying the integrated value to the processor only while in the communicating state; wherein the communicating state is a transmit period or receive period of the electronic device.
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Specification