daisychain linear dc supplies?

[thx1138]

Gentlemen,
I've read the info on linking switching supplies and i'm wondering if the same would apply to linking two linear dc supplies?
What i have are two identical 28v 4 amp linear dc supplies and what i'm looking for is to end up with a 28volt 8 amp supply. I figure if i chain them i'll get a 56v 4a supply
is it just a matter of conecting both supplies directly to to my inputs to get 28v 8a?
any other concerns i should have?

[NC Cams]

WHen I was a kid, I had two transformers from my slot racing set. Basically, I looked at them as being two batteries that I hooked up in series. Ran them for quite some time that way and, yes, the voltage added.

Assuming that the secondaries are isolated from ground, you should be able to hook them up in series just as if they are batteries hooked in series.

HOWEVER, if the secondaries are hooked to ground for some reason this could become problematic. However, if you break any grounding link on the DC side, you should then be ablt to daisychain them.

The ground link elimination is not unlike that which must be done on the AT/ATX power supplies when you daisy chain them.

[thx1138]

guess i had that titled wrong. i'm not looking for a voltage increase, but an amp increase. rather than double the volts and maintain the amps, i want to double the amps and maintain the volts.

[dertsap]

i beleave you can connect them for added amps , connect the two pos together and the negs together for more amps same voltage,
connect pos from one to the neg on the other for more voltage same amps

[Al_The_Man]

I would only consider parallel for non-regulated linear only, and even then, the voltage and VA would have to be very close to each other, definatly not for switching type.
Al.

[dertsap]

i talked to the support for my power-one supplies which are regulated linear and they said no problem to do connect them either way ,
what would be the problem to doing this with regulated supplies ?since we're on the subject what is the main difference to regulated and non regulated ,
does regulated have better controlled tolerance on voltage fluctuation?

[Al_The_Man]

Regulated are just that, they have electronic regulation for constant voltage level regardless of current, some also have crowbar shut down, this is over-voltage protection, IOW if the output voltage was to go above the normal for whatever reason, the voltage 'Folds back' , those fitted with the crowbar detect the over-voltage and permanently force a high current shutdown until the OV is remedied.
You may get away with it most of the time, or in a pinch, but I would prefer not to temp fate.
Al.

[thx1138]

well, these are power one supplies, both identical. so i guess it's a go.
thanks guys!