PC Automatic Power-on Circuit

Published:2013/3/10 22:38:00 Author:Ecco | Keyword: PC Automatic, Power-on Circuit | From:SeekIC

This project is for a power-on boot sequencer that works with PC-style computers that have a low-voltage controlled power supply such as an ATX or Mini-ITX system. Some computers have built-in BIOS functionality that can be set to boot up the computer when AC power is applied, others do not. This circuit is intended for the latter type of computer. A desktop PC can be used for a variety of dedicated purposes such as a home automation controller, a burglar alarm or an automatic motion-operated camera. Such a system needs to be able to automatically restart when the AC mains power drops out and comes back on. A battery-backed uninterruptible power supply (UPS) is normally a good solution for this problem, but if the power remains off for long enough, the UPS battery will drain and the computer will eventually power down. This circuit can be used to manage computers that are located in remote locations. It is also useful for booting normal desktop systems where the power to the CPU, monitor and printer are controlled from a single plug-strip. This circuit provides the necessary timing to virtually press the PC's power on switch and the PC's reset switch. If the PC uses an external 12V power supply, such as a Mini-ITX device, power for this circuit can come from the PC's power supply. For larger desktop systems, it may be necessary to power this circuit with an external 12V DC supply such as a wall-wart.



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