Connect with us

PC PSU in Parallel

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

Scroll to continue with content
  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?


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


    The Consensus:-
    The political party for the new millenium
  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

    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


    The Consensus:-
    The political party for the new millenium
  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!
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day