| 摘要 |
<p>A device for detecting an instantaneous voltage drop of a DC power source includes first means for producing a low-level signal having a duration associated with a period of time in which a voltage of the power source remains lower than a predetermined level, and a high-level signal having a duration associated with a period of time in which the voltage of the power source remains higher than the predetermined level; second means for performing a discharging operation based on a first time constant in response to the low-level signal and a charging operation based on a second time constant smaller than the first time constant in response to the high-level signal, the second means producing a first signal having levels which are individually associated with the charging operation and the discharging operation; and third means for detecting that the voltage of the power source has become lower than the predetermined level by comparing the level of the first signal with a reference voltage level.</p> |
