| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit protection device protecting a circuit from a high voltage at the abnormal time while accomplishing low cost and miniaturization. SOLUTION: The circuit protection device comprises a circuit 7 to be protected having a set withstand voltage; a power source for feeding a power to the circuit 7 to be protected; a detection comparison circuit 5 for detecting a power source voltage of the power source 1, comparing the detected power source voltage with a reference voltage and outputting it based on the obtained comparison result; and a protection switch SW provided between the circuit 7 to be protected and the power source 1 and carrying out an ON/OFF operation in response to the output of the detection comparison circuit 5. When the power source voltage becomes a predetermined high voltage or higher, the protection switch is turned OFF and the circuit to be protected is protected. COPYRIGHT: (C)2004,JPO&NCIPI
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