Boost PC ATX Power Supplies to 24v..32v

[ggg]

As everybody knows, PC PSU has many advantages: high current, low wheigh, small size, shortcut protection, +5v TTL & CMOS compatible, etc, etc... but specially that SMPS for PCs are really cheap.

But the only problem is the low voltage to get a good result for yours Stepper Motors.

Well.... Could all "The Experts" help me?
Could you suggest some solutions
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I'm trying to find a solution for that problem.

I want to try this:
ATX PSU with 450W:
+12v*18A
+5v*45A

I step-up them with 2 "MC34063A + IRFZ44" boards (few bucks),
getting 24V*8A and all the advantages of a ATX PSU.


Please take a look and tell me what you think.

[ggg]

We can increase the power connecting them in parallel more PSU and changing the mosfet. Do you Know a simpler way?

[joecnc2006]

Its been discussed several times, do a search and you will find them, Anyway I have three connected in series with a floating ground and get 32.6v 8a.

Joe

[ggg]

You are right, There is many Thread on how to connect PSU in series (I did not try them), but this one is aim to get the best efficiency for a single PSU. and preserve the advantages:

With 3 PSU you get 256W, with step-up or boost way you can get 196W for 1 PSU

Do you lose the shortcut protection advantage with Series connection?, means extra disadvantage for series connection on SMPS.
Also, you have to cut/break the Ground protection (3rd prong), so your PSU system will become unsafe, what’s more, dangerous.