Protection Circuit And Electronic Device
First Claim
1. A protection circuit that is used with a power supply that produces charging power, and a storage battery for which normal operation is conditional upon a terminal voltage being less than or equal to a maximum voltage, comprising:
- a first switch disposed to a first path that electrically connects the storage battery and the power supply;
a second path that electrically connects the storage battery and a load;
a voltage detection circuit that detects a terminal voltage of the storage battery;
an over-charge detection circuit that monitors the storage battery terminal voltage and controls the first switch to turn off when the terminal voltage is detected to exceed the maximum voltage; and
a control circuit that controls the monitoring operation interval of the over-charge detection circuit according to the terminal voltage of the storage battery detected by the voltage detection circuit.
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Accused Products
Abstract
A protection circuit that is used with a power supply that produces charging power, and a storage battery for which normal operation is conditional upon a terminal voltage being less than or equal to a maximum voltage, including: a first switch disposed to a first path that electrically connects the storage battery and the power supply; a second path that electrically connects the storage battery and a load; a voltage detection circuit that detects a terminal voltage of the storage battery; an over-charge detection circuit that monitors the storage battery terminal voltage and controls the first switch to turn off when the terminal voltage is detected to exceed the maximum voltage; and a control circuit that controls the monitoring operation interval of the over-charge detection circuit according to the terminal voltage of the storage battery detected by the voltage detection circuit.
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Citations
9 Claims
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1. A protection circuit that is used with a power supply that produces charging power, and a storage battery for which normal operation is conditional upon a terminal voltage being less than or equal to a maximum voltage, comprising:
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a first switch disposed to a first path that electrically connects the storage battery and the power supply; a second path that electrically connects the storage battery and a load; a voltage detection circuit that detects a terminal voltage of the storage battery; an over-charge detection circuit that monitors the storage battery terminal voltage and controls the first switch to turn off when the terminal voltage is detected to exceed the maximum voltage; and a control circuit that controls the monitoring operation interval of the over-charge detection circuit according to the terminal voltage of the storage battery detected by the voltage detection circuit. - View Dependent Claims (9)
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2. A protection circuit that is used with a power supply that produces charging power, and a storage battery for which normal operation is conditional upon a terminal voltage being greater than or equal to a minimum voltage and less than or equal to a maximum voltage, comprising:
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a first switch disposed to a first path that electrically connects the storage battery and the power supply; a second switch disposed to a second path that electrically connects the storage battery and a load; a voltage detection circuit that detects a terminal voltage of the storage battery; an over-charge detection circuit that monitors the storage battery terminal voltage and controls the first switch to turn off when the terminal voltage is detected to exceed the maximum voltage; an over-discharge detection circuit that monitors the storage battery terminal voltage and controls the second switch to turn off when the terminal voltage is detected to be below the minimum voltage; and a control circuit that controls the monitoring operation interval of the over-charge detection circuit and the over-discharge detection circuit according to the terminal voltage of the storage battery detected by the voltage detection circuit. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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Specification