Discharge control circuit of batteries
First Claim
1. A discharge control circuit for controlling discharge of a battery including at least one cell comprising:
- a discharge control switch connected to the battery for cutting off a discharge current of the battery in response to a discharge stop signal; and
a control circuit connected to the battery and the discharge control switch for generating the discharge stop signal that deactivates the discharge control switch when a voltage of at least one cell reaches a lower limit, wherein the control circuit includes a switch holding circuit for continuously supplying the discharge stop signal to the discharge control switch for a predetermined time after the discharge stop signal is generated.
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Accused Products
Abstract
A discharge control circuit that securely prevents an over discharge of a battery. The control circuit includes a discharge control switch connected to the battery for cutting off a discharge current of the battery in response to a discharge stop signal. A control circuit is connected to the battery and the discharge control switch generates the discharge stop signal for deactivating the discharge control switch when a voltage of at least one cell reaches a lower limit. The control circuit includes a switch holding circuit for continuously supplying the discharge stop signal to the discharge control switch for a predetermined time after the discharge stop signal is generated regardless of the cell voltage.
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Citations
13 Claims
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1. A discharge control circuit for controlling discharge of a battery including at least one cell comprising:
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a discharge control switch connected to the battery for cutting off a discharge current of the battery in response to a discharge stop signal; and
a control circuit connected to the battery and the discharge control switch for generating the discharge stop signal that deactivates the discharge control switch when a voltage of at least one cell reaches a lower limit, wherein the control circuit includes a switch holding circuit for continuously supplying the discharge stop signal to the discharge control switch for a predetermined time after the discharge stop signal is generated. - View Dependent Claims (2, 3)
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4. A discharge control circuit for controlling discharge of a battery including at least one cell comprising:
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a discharge control switch connected to the battery for cutting off a discharge current of the battery in response to a discharge stop signal;
a cell voltage detecting circuit connected to the battery for generating a cell voltage detection signal when a voltage of at least one cell reaches a lower limit;
a delay time setting circuit connected to the cell voltage detecting circuit for generating the discharge stop signal after a first predetermined time from the moment that the cell voltage detection signal is generated; and
a latch circuit connected to the delay time setting circuit for latching the discharge stop signal and supplying the discharge control switch with the latched discharge stop signal, wherein the delay time setting circuit includes a switch holding circuit for invalidating the cell voltage detection signal for a second predetermined time after the latched discharge stop signal is supplied and continuously supplying the latched discharge stop signal for the second predetermined time. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A discharge control circuit for controlling discharge of a battery including at least one cell comprising:
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a discharge control switch connected to the battery for cutting off a discharge current of the battery in response to a discharge stop signal;
a cell voltage detecting circuit connected to the battery for generating a cell voltage detection signal when a voltage of at least one cell reaches a lower limit;
a delay time setting circuit connected to the cell voltage detecting circuit for generating the discharge stop signal after a first predetermined time from the moment that the cell voltage detection signal is generated;
a first latch circuit connected to the delay time setting circuit for latching the discharge stop signal and supplying the discharge control switch with the latched discharge stop signal; and
a second latch circuit connected to the first latch circuit for performing a set operation in response to the latched discharge control signal and invalidating a reset operation of the first latch circuit for a second predetermined time after the latched discharge stop signal is supplied. - View Dependent Claims (12, 13)
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Specification