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PC PSU in Parallel

Discussion in 'Electronic Design' started by Dirk Bruere at Neopax, Jan 6, 2006.

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  1. Since non standard high power switching PSUs are absurdly expensive is it
    possible to parallel PC PSUs eg 5V + 5V = 10V? (5-0-5)

    If so, any problems likely? And how do such PSUs fail? If one fails will I
    likely get 0, 5V, something weird?

    --
    Dirk

    The Consensus:-
    The political party for the new millenium
    http://www.theconsensus.org
     
  2. Er... ****SERIAL****!
    Sorry about that - brain malfunction.

    --
    Dirk

    The Consensus:-
    The political party for the new millenium
    http://www.theconsensus.org
     
  3. Should be Ok provided that one puts a diode across each power supply so one
    cannot push current through the other (if it is off) and each unit need a
    minimum load on the 5V line to regulate.

    Much work has gone into making them fail OFF, with Zero output - but they
    *are* cheap shite really and if the load is more expensive than the common
    USD 100 motherboard you might want additional protection: fuses+transorbs.
     

  4. You do realize that the power supply common is bonded to earth
    ground?

    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  5. No.
    That's why I post such Q here

    --
    Dirk

    The Consensus:-
    The political party for the new millenium
    http://www.theconsensus.org
     
  6. Rich Grise

    Rich Grise Guest

    If you really want plus 5, zero, minus 5, then yes, if you float the
    chassis of the one you're going to use for the negative supply, and
    use that as the negative supply itself, and connect its positive output
    to your 0V reference (often called "ground"). I saw this done a lot
    before the 7900 series three-terminal negative regulators were perfected.
    If you intended to make one 10V supply, then I'd say no, don't even
    try, because it's a nightmare trying to get them to share the load
    properly. But, like I say, if it's for a plus and minus supply, it's
    doable, but watch your ground loops, observe all safety precautions, No
    warranties expressed or implied, do at your own risk, and all the
    standard disclaimers.

    Good Luck!
    Rich
     
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