| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an apparatus, system, and method for accurate and early detection of an AC power loss. <P>SOLUTION: An apparatus, system, and method for determining power source failures are disclosed. A sampling module samples an AC power waveform as an input to a power supply, at a sampling frequency which is a multiple of a predetermined frequency, to obtain a sampled amplitude at a known point within the predetermined period. A comparison module compares the sampled amplitude with a stored threshold amplitude, to obtain a comparison result corresponding to the known point. An accumulation module accumulates the most-recent comparison results. A warning module asserts an early power-off warning signal if a predetermined number of most recent comparison results each indicate that the sampled amplitude is smaller in the absolute value than that of the stored threshold amplitude. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
