CHARGE CONTROL CIRCUIT, BATTERY PACK, AND CHARGE SYSTEM
First Claim
1. A charge control circuit, comprising:
- a charge control unit that controls an operation of a charging unit that charges a rechargeable battery;
a voltage detection unit that detects a terminal voltage of the rechargeable battery; and
a current detection unit that detects a current flowing in the rechargeable battery;
wherein if a current value detected by the current detection unit exceeds an anomalous current threshold value set to a value that exceeds a current value requested to the charging unit, and when the terminal voltage of the rechargeable battery as detected by the voltage detection unit is equal to or greater than a second threshold-value voltage that is set beforehand to a voltage value lower than a full charge voltage being a terminal voltage at a time when the rechargeable battery is in full charge, the charge control unit carries out a first anomaly response process of requesting, to the charging unit, a charge voltage of the second threshold value voltage, and of carrying out the constant voltage charging through supply of that charge voltage to the rechargeable battery.
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Abstract
A charge control circuit includes a charge control unit that controls an operation of a charging unit that charges a rechargeable battery; and a voltage detection unit that detects a terminal voltage of the rechargeable battery, wherein when a terminal voltage of the rechargeable battery as detected by the voltage detection unit is lower than a predetermined first threshold-value voltage, being lower than a full-charge voltage which is a terminal voltage of the rechargeable battery in full charge, the charge control unit causes a constant current charging to the rechargeable battery by requesting the charging unit to supply a charging current of a predetermined first current value, causing the charging unit to supply a charging current of the first current value to the rechargeable battery, when the terminal voltage of the rechargeable battery as detected by the voltage detection unit exceeds the first threshold-value voltage but is less than the full charge voltage, the charge control unit causes the constant current charging to the rechargeable battery by requesting the charging unit to supply a charging current of a second current value that is smaller than the first current value, causing the charging unit to supply a charging current of the second current value to the rechargeable battery, and when the terminal voltage of the rechargeable battery as detected by the voltage detection unit is equal to or greater than the full charge voltage, the charge control unit causes a constant voltage charging to be carried out by causing the charging unit to supply the full charge voltage to the rechargeable battery, as a charge voltage.
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Citations
10 Claims
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1. A charge control circuit, comprising:
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a charge control unit that controls an operation of a charging unit that charges a rechargeable battery; a voltage detection unit that detects a terminal voltage of the rechargeable battery; and a current detection unit that detects a current flowing in the rechargeable battery; wherein if a current value detected by the current detection unit exceeds an anomalous current threshold value set to a value that exceeds a current value requested to the charging unit, and when the terminal voltage of the rechargeable battery as detected by the voltage detection unit is equal to or greater than a second threshold-value voltage that is set beforehand to a voltage value lower than a full charge voltage being a terminal voltage at a time when the rechargeable battery is in full charge, the charge control unit carries out a first anomaly response process of requesting, to the charging unit, a charge voltage of the second threshold value voltage, and of carrying out the constant voltage charging through supply of that charge voltage to the rechargeable battery. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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2. (canceled)
Specification