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 Mar 15, 2005 - 10:00 AM - by Michael
* Dan's Data: Inside the PSU

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PC Games/Hardware/Microsoft
Ever wondered what's inside a computer's power supply unit? Dan's latest is an explanation for those who are curious.

Switching regulators don't actually change the voltage going through them. They just turn it on and off very quickly. Feed a switching regulator 20 volts and ask for 10 volts from it, and it'll rapidly pulse its output so that half the time its output is at 20 volts and half the time it's at zero. Do this fast enough, and put a capacitor or three across the output to smooth it out, and you get a nice clean ten volts without ever having to just throw watts away as heat.

 

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