How ATX PSUs work, and how they die. PSU Autopsy
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Uploaded by ChumpusRex on Jan 14, 2012
This is an old 525W PC power supply. It's cheap Chinese junk, and the capacitors have blown. It kind of still works, but not well enough to want to keep.
This is a disassembly, and a discussion of how a PC PSU works, and what the various components are and what they do.
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Uploader Comments (ChumpusRex)
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Heh the good old Athlon XP... I had an XP2500 running at 3200 speed :)
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hmm, ive never seen the powerfactor circuit used in any psu, cheapness?
And my understanding of the inverter section is "pulse width modulation" driver, a longer on time = more voltage.
Ive only ever used the word inverter to discribe the conversion from a low voltage to high, like 12v to 240, i suppose common usage with car inverters has biased me lol.
I found panasonic 105deg capacitors from r.s semiconductors work ok, ideal for the balooned ones around the memory strips.
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PFC correction is a legal requirement in Europe for any PSU >75W. It used to be done with a passive filter (capacitor and inductor), but the inductor required was BIG, especially once power levels get above about 400W. Not seen aPFC on a separate PCB before though.
Inverter just means a circuit that converts DC to AC. And, in most PSUs, this is what happens - the polarity to the transformer is reversed. In the case of regulated PSUs, PWM is used to control the power flow.
ChumpusRex 1 month ago