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Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
I am making a new power supply for my zvs, because i'm sick of the tiny amount of ripple from my old supply, i was gonna put 4 computer supplies in series to get 48 vdc, but i got 3 supplies wired up, and 1 keeps shutting off when its hooked up to he other supplies, but it works fine when its wired alone, and my 4th supply has no green wire to turn it on, so witch wire do i use?
I hope you can understand what I'm saying, especially with the n00bie question i should know this!
Registered Member #2909
Joined: Wed Jun 09 2010, 12:31AM
Location: fort belvoir, Va USA ( south of DC)
Posts: 145
for the one that turns off, you are trippin the short protection, some how your drawing too much power or over volting it. for the one with no gren wire tap groun and tap each none ground (black) pin in till the fan comes on. hope this helps
Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
so i should find a different supply for the 1 that is shutting off? thanks
Registered Member #2422
Joined: Tue Oct 06 2009, 02:41AM
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Posts: 85
The black wires on these supplies (at least the one next to me) are connected to ground. This is attached to both the metal case as well as the 3rd prong on the outlet.
What this means is when you put the supplies in series, you are shorting out all but one of them. As these supplies are not an isolated design, there is really no safe way to do what you're trying to do.
Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
Registered Member #51
Joined: Thu Feb 09 2006, 04:17AM
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Posts: 263
Many possible problems. The power supplies need to have their outputs float from the case or you will short circuit the "top" ones through the mains ground. Also, you may need reverse current protection diodes on the outputs of the supplies so you are not able to force current the wrong way through them. It will also probably be important to turn everything on at the same time or "from the bottom of the stack up".
Summary: isolate the secondary side from the case on all but the bottom power supply. Use a many contact switch or several optoisolators to turn all the supplies on at the same time.
Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
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computer psu help
