Power on/off control device for computer
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United States of America Patent
Stats
-
May 29, 2001
Grant Date -
N/A
app pub date -
May 12, 1998
filing date -
May 13, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power on/off control device having a first power supply outputs a predetermined first electric power upon receiving input power and a second power supply outputs a main electric power to operate the computer upon power-on, which is turned on and off according to power driving signals of a first level or a second level. A power switch outputs a first level while the power switch is being pressed down, and a second level while not pressed down. A power driving signal output outputs power driving signals of the first level or of the second level alternatively according to inputted pulse signals from a microprocessor, the microprocessor has a first port connected with the power switch and a second port coupled with the power driving signal output, for controlling power on/off according to signal levels from the first port and the second port. A data output forwards data outputted from the microprocessor to a system data bus. A data input sends data inputted through the system data bus to the microprocessor. The microprocessor detects on/off status of computer according to signal levels inputted through the second port and outputs pulse signals to the power driving output according to the signal levels from the power switch and command data from the data input.
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