Electronics > Beginners

Wire Multiple SMPS In Parallel

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james_s:
It's simple to install one on a power supply, either directly or with a small pigtail. I have a few different 12V 50-60A power supplies with XT60 outputs, they are former hot swap server power supplies. 

I have PCB mounted them too, horizontally by placing rectangular pads at the edge of the board and vertically using large pads with ~6mm holes.

ocset:
if you put standard voltage output regulated smps's in parallel, one of them will do all the work, and the other will be doing virtually nothing
attached describes parallel smps's
you can buy chips which arrange for certain smps's in parallel to share the load.
Or you can have smps's with transconductance error amplifiers (TEA) and connect all the TEA outputs together, so they act liek one big smps.
Or you can jut s have one error amplifier which controls all the parallel smps's

....otherwise you dont get sharing and one does all the work.

tooki:

--- Quote from: Seph.b on July 05, 2018, 05:59:10 pm ---Will anything bad happen if I wire multiple of the exact same 12v SMPS in parallel to increase the current rating?

--- End quote ---
I feel like this question gets asked every few months…

Cliff Matthews:

--- Quote from: tooki on July 07, 2018, 01:02:17 pm ---
--- Quote from: Seph.b on July 05, 2018, 05:59:10 pm ---Will anything bad happen if I wire multiple of the exact same 12v SMPS in parallel to increase the current rating?

--- End quote ---
I feel like this question gets asked every few months…

--- End quote ---
Agreed, but for those in a pinch (enough to put up with the losses), has anyone ever explained ballast resistor losses?

I haven't seen it discussed, but years ago I saw some pretty big back-feed diodes and resistors on redundant backplanes.
What would one do in such a pinch? count each supply as able to deliver 50 to 75% of its original rating?

james_s:
Those hot swap server PSUs I mentioned can be wired in parallel, they're designed for it and have a current sharing pin that allows them to coordinate to share the load. With the small ones being capable of around 30 Amps I have not yet found a need to parallel them myself but it's easy to do.

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