| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply monitoring device and a power supply monitoring method which is excellent in reliability and convenience capable of protecting a load device from an overvoltage and a low voltage.SOLUTION: A power supply monitoring device (1) disposed between a power supply device (2) and a load device (3) for monitoring a power supply voltage (V2) includes: a voltage monitoring circuit (12) for monitoring a reference voltage (V1) to be output by a reference voltage generation circuit (11), and for, when detecting the overvoltage or low voltage of the reference voltage, interrupting the power supply device from the load device by switching a first switch (Sw1) to an OFF state; and a diagnosis circuit (13) for generating the overvoltage state or low voltage state of the reference voltage in a pseudo manner in a state that power supply to the load device is maintained by preliminarily switching a second switch (Sw2) to an ON state, and for determining whether or not a power supply interrupting function by the voltage monitoring circuit is normally executed. |
