Re: PC PSU in Parallel - No, Series

On Sun, 08 Jan 2006 02:58:58 +0000, Dirk Bruere at Neopax wrote:
> Michael A. Terrell wrote:
>> Dirk Bruere at Neopax wrote:
>>>
>>>>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?
>>>
>>>Er... ****SERIAL****!
>>>Sorry about that - brain malfunction.
>>>
>> You do realize that the power supply common is bonded to earth
>> ground?
>
> No.
> That's why I post such Q here

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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