Method and apparatus for detecting AC removal
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United States of America Patent
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-
Aug 3, 2004
Grant Date -
Oct 17, 2002
app pub date -
Mar 9, 2001
filing date -
Mar 9, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus for transitioning the CPU of a computer system to a lower performance level upon removal of AC power. Circuitry within the system input power control detects the removal of the AC power. The circuitry generates an event that causes power management software to immediately transition the CPU to a lower performance level sufficient to prevent the unwanted shutdown of the system. The AC power removal detection and CPU transition are effected while the system maintains an operational power level due to residual power in the system capacitors.
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