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Power Supplies

Posted on 2006-11-01
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Last Modified: 2010-04-26
Doing some reading right now about desktop computers it mentions that the power supplies monitor the qulity of DC voltages it supplies to the rest of the PC.  If this voltage drops below an acceptable level, the power supply unit lowers the voltage to the motherboard.  If so, the computer simply resets itself and begins computing again when the voltage returns to a suitable level.  Is that saying it is rebooting, or is it saying it is putting the process or computer on hold until it gets the level to the proper voltage?  And it is also saying that the voltages are +12, +5, -5, and -12.  Are they no longer using 3.3V?
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Question by:William Richardson
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jasonr0025 earned 50 total points
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will pc restart or standby-- it will restart.   Most cpus/mbs are very sensitive to voltage swings and most pcs will simply reset when 12v --(which ultimately powers cpu)--swings to high or low.  
Are the still using 3.3v--yes but I don't think that it is a monitored voltage in the sence that the p/s has built in active monitoring and correction.

If you look at the 20 - 24 pin m/b connector on some p/s you will notice that pins 11 and 20 or 13 and 20(varies widely) may have 2 wires running to one pin.  One of these wires are voltage and the other (usually smaller) wire is monitored by hardware in the p/s (transistors) that use this voltage as a signal to maintain proper voltages.  
Hope this helps
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