| 摘要 |
PROBLEM TO BE SOLVED: To provide a power source voltage monitoring device, which sets the type of voltage to be supplied thereto of a device using multiple kinds of voltages to one, moreover, enables monitoring for abnormality, even in case of the disconnection of a detecting line and makes even a power source unit of a low level of negative voltage invulnerable to the effect of noises. SOLUTION: In the power source voltage monitoring circuit for monitoring abnormality of the voltage of a power source unit through a cable for detecting voltage, there are arranged a protective resistance having a specified resistance value inserted between the power source unit and the cable for detecting voltage, a voltage-dividing means for dividing a power source voltage via the protective resistance, a first comparator which compares the voltage divided by the voltage-dividing means with a specified reference voltage to be outputted in inversion, a second comparator which compares the voltage divided by the voltage-dividing means with a prescribed reference voltage to be outputted in inversion and a gate means which receives outputs second and first comparators and outputs a logical OR.
|
