ATX supply question

I converted an ATX to a general bench supply. Very easy, and works well. But when I overload it (brief short etc) it shuts down.

Ok, but in about 30 minutes? it comes back to work.

I can't figure out what kind of protective system it uses that takes that long to reset.

Any ideas?

TOM K8ERV Montrose Colo

 

From articles I have read the subsystem they use requires removal of line voltage for a timely reset.

 

I've tried that, no joy. Not a problem, just curious.

TOM K8ERV Montrose Colo

 

http://en.wikipedia.org/wiki/Resettable_fuse

 

That is a possibility, but I didn't see any times. I doubt if that would trip instantly and take so long to reset. ??

TOM K8ERV Montrose Colo

 

I should have mentioned that the supply must remain without mains voltage for about a minute.

 

Mine takes a lot longer to reset, that is what I can't figiure out.

TOM K8ERV Montrose Colo

 

That is strange Tom...
Have you looked up the ATX standard on the net for clues.

 

No, probably a good idea, but too much trouble. I just thot maybe someone else had seen this long reset and already knew why.

TOM K8ERV Montrose Colo

 

I see by the diagram there is an over-current shut down, which looks fast, but I don't see any thing that
would require such a long time to reset.

TOM K8ERV Montrose Colo