Battery protection circuit and battery apparatus including the same
An embodiment provides a battery protection circuit, including: a detection circuit portion that outputs a wake-up signal when a voltage is input to an outer terminal, a controller that outputs a switching control signal when the wake-up signal is received from the detection circuit portion, and a switching portion that controls a connection of a battery module and the outer terminal according to the switching control signal.
1. A battery protection circuit, comprising:
a detection circuit portion that outputs a wake-up signal when a voltage is input to an outer terminal, the detection circuit portion including:
a first resistor, a second resistor, and a second diode connected in series between the outer terminal and a ground;
a first diode connected between a node between the first resistor and the second resistor and the outer terminal; and
a transistor connected between the outer terminal and the controller and controlled by a voltage of the node between the first resistor and the second resistor;
a controller that outputs a switching control signal when the wake-up signal is received from the detection circuit portion; and
a switching portion that controls a connection of a battery module and the outer terminal according to the switching control signal.
2. The battery protection circuit as claimed in claim 1 , wherein the controller does not output the switching control signal, so that the switching portion is opened, when no wake-up signal is received from the detection circuit portion.
3. The battery protection circuit as claimed in claim 1 , wherein, when the voltage at the node between the first resistor and the second resistor is higher than a breakdown voltage of the transistor, the transistor transmits the wake-up signal to the controller.
4. The battery protection circuit as claimed in claim 1 , wherein, when the voltage at the node between the first resistor and the second resistor is lower than a breakdown voltage of the transistor, the transistor does not transmit the wake-up signal to the controller.
5. A battery module protecting method, comprising:
outputting, by a detection circuit portion, a wake-up signal when a voltage is input from an outer terminal, wherein the detection circuit portion includes:
a first resistor, a second resistor, and a second diode connected in series between the outer terminal and a ground;
a first diode connected between a node between the first resistor and the second resistor and the outer terminal; and
a transistor connected between the outer terminal and the controller and controlled by a voltage of the node between the first resistor and the second resistor;
outputting, by a controller, a switching control signal when the wake-up signal is received from the detection circuit portion; and
controlling, by a switching portion, a connection of a battery module and the outer terminal according to the switching control signal.
6. The battery module protecting method as claimed in claim 5 , further comprising outputting, by the controller, no switching control signal, so that the switching portion is opened, when no wake-up signal is received from the detection circuit portion.
7. The battery module protecting method as claimed in claim 5 , wherein the outputting, by the detection circuit portion, of the wake-up signal when the voltage is input from the outer terminal includes:
outputting, by the transistor, the wake-up signal when the voltage at the node between the first resistor and the second resistor is higher than a breakdown voltage of the transistor.
8. The battery module protecting method as claimed in claim 5 , wherein the outputting, by the controller, of no switching control signal, so that the switching portion is opened, when no wake-up signal is received from the detection circuit portion includes:
outputting, by the transistor, no wake-up signal when the voltage at the node between the first resistor and the second resistor is lower than a breakdown voltage of the transistor.
9. A battery apparatus, comprising:
a battery module;
an outer terminal configured to connect an external device to the battery module; and
a protection circuit, wherein the protection circuit includes:
a detection circuit portion that outputs a wake-up signal when a voltage is input to the outer terminal, the detection circuit portion including:
a first resistor, a second resistor, and a second diode connected in series between the outer terminal and a ground;
a first diode connected between a node between the first resistor and the second resistor and the outer terminal; and
a transistor connected between the outer terminal and the controller and controlled by a voltage of the node between the first resistor and the second resistor;
a controller that outputs a switching control signal when the wake-up signal is received from the detection circuit portion; and
a switching portion that controls a connection of the battery module and the outer terminal according to the switching control signal.