Electronic device, and circuit and method for protecting the same

1. An electronic device comprising:

a battery protection circuit for stopping a current from a battery when the current of a predetermined value or higher is output from the battery;

a detection circuit for detecting at least one of a current value and a voltage value of a predetermined circuit in the electronic device; and

a control circuit for executing at least one of an operation of the battery protection circuit and the stopping of a current to the predetermined circuit if a detected value of the detection circuit is outside a tolerance range, wherein the electronic device is a portable electronic device, and wherein the control circuit stops supplying of the current to the predetermined circuit during a period of transmission, and operates the battery protection circuit during a period of non-transmission.

2. An electronic device according to claim 1 , further comprising:

a transmission controller for outputting to the control circuit transmission control signals which are different between periods of transmission and non-transmission.

3. An electronic device according to claim 1 , wherein the predetermined circuit is at least one selected from an amplifier, an incoming call informing circuit, a camera circuit, a display circuit, and an illumination circuit.

4. A protection circuit for protecting an electronic device in which a battery can be incorporated, comprising:

a battery protection circuit for stopping a current from a battery when the current of a predetermined value or higher is output from the battery;

a detection circuit for detecting at least one of a current value and a voltage value of a predetermined circuit in the electronic device; and

a control circuit for operating the battery protection circuit if a detected value of the detection circuit is outside a tolerance range, wherein the electronic device is a portable electronic device, and wherein the control circuit stops supplying of the current to the predetermined circuit during a period of transmission, and operates the battery protection circuit during a period of non-transmission.

5. An electronic device according to claim 4 , further comprising:

a first switch arranged between the predetermined circuit and the battery protection circuit; and

a second switch for short-circuiting the battery.

6. An electronic device according to claim 5 , wherein the first switch is ON while the second switch is OFF in an initial state.

7. An electronic device according to claim 6 , wherein the control circuit turns OFF the first switch if the detected value of the detection circuit is outside the tolerance range during a period of transmission, and turns ON the second switch if the detected value is outside the tolerance range during a period of non-transmission.

8. An electronic device according to claim 7 , wherein the first and second switches return to initial states after a predetermined time has passed.

9. An electronic device according to claim 5 , wherein the control circuit includes a third switch for selecting a signal to control the first switch.

10. An electronic device according to claim 5 , wherein the detection circuit detects voltage values of both ends of the first switch, and the control circuit controls the first switch in accordance with the detected values.

11. A protection circuit according to claim 4 , wherein the control circuit short-circuits the battery for predetermined time if the detected value is outside the tolerance range.

12. A method for protecting a portable electronic device equipped with a battery protection circuit for stopping a current from a battery when a battery outputs the current of a predetermined value or higher, comprising the steps of:

monitoring at least one of a current value and a voltage value of a predetermined electronic circuit in the electronic device;

determining whether the monitored value is within a predetermined tolerance range or not;

short-circuiting the battery for a predetermined time if the monitored value is outside the tolerance range; and

stopping supplying of the current to the predetermined circuit during a period of transmission, and operating the battery protection circuit during a period of non-transmission.

13. An electronic device comprising:

a battery protection circuit for stopping a current from a battery when the current of a predetermined value or higher is output from the battery;

a detection circuit for detecting at least one of a current value of a predetermined circuit the electronic device;

a control circuit for executing at least one of an operation of the battery protection circuit and the stopping of supply of a current to the predetermined circuit if a detected value of the detection circuit is outside a tolerance range;

a first switch arranged between the predetermined circuit and the battery protection circuit; and

14. An electronic device according to claim 13 , wherein the first switch is ON while the second switch is OFF in an initial state.

15. An electronic device according to claim 14 , wherein the control circuit turns OFF the first switch if the detected value of the detection circuit is outside the tolerance range during a period of transmission, and turns ON the second switch if the detected value is outside the tolerance range during a period of non-transmission.

16. An electronic device according to claim 15 , wherein the first and second switches return to initial states after a predetermined time has passed.

17. An electronic device according to claim 13 , wherein the control circuit includes a third switch for selecting a signal to control the first switch.

18. An electronic device according to claim 13 , wherein the detection circuit detects voltage values of both ends of the first switch, and the control circuit controls the first switch in accordance with the detected values.