| 摘要 |
<p>PROBLEM TO BE SOLVED: To determine whether drop of DC voltage is due to instantaneous interruption or a power supply ripple to quicken determination of the instantaneous interruption when the DC voltage drops to predetermined voltage or lower.SOLUTION: An instantaneous interruption detector comprises voltage monitoring means for monitoring whether or not DC voltage to be supplied from a power supply circuit for converting AC voltage to be input into the DC voltage becomes less than predetermined voltage, in which the voltage monitoring means determines that power supply is instantaneously interrupted when the DC voltage does not recover to the predetermined voltage or higher within time of one period of a ripple component resulting from a power supply period of the AC voltage contained in the DC voltage after the DC voltage becomes less than the predetermined voltage.</p> |
