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Suggestions for converted power-supply desgin

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k-man

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Suggestions for converted power-supply design

I've pulled the p/s units out of my old HP server and would like to use them as the core of a DIY benchtop power supply. I think I've got a pretty sound strategy for wiring them up to get selectable 12/24/36v configurations (as well as the microcontroller/display brains), however I'm not quite sure what would be the best way to implement a voltage adjuster. Since each unit can push uplwards of 36amps (IIRC) on each of its +12/+5/+3.3 lines, I was toying with the idea of using large Power Mosfets for that purpose.

What I've seen so far in other circuit designs has been geared towards using fets as a regulating/amplifying core, rather than using them to adjust the voltage on an already regulated/stabilized DC output. My concern, not be an expert in this area, is that I'll degrade the already pristine signal. And, to make things more interesting, I'm planning on running the output through an adjustable current limiter. I'm not sure how that will effect the mosfet strategy, but I'd like to hear any thoughts/ideas/examples on what would produce the best results.

Thanks in advance.
-mike
 

You apparently intend a series connection of the 12V supplies. Usual PC benchtop power supplies have output common (0 V) tied to protective earth, so they can't be series connected. You should check, if your supply has an isolated output.
 

You apparently intend a series connection of the 12V supplies. Usual PC benchtop power supplies have output common (0 V) tied to protective earth, so they can't be series connected. You should check, if your supply has an isolated output.

I have to float units 2 & 3 when running in coupled mode. I'll cut their grounds and use a a relay network (driven from the PIC) to handle that aspect. (Since all the circuitry will be removed and placed within a single glass case, this shouldn't pose any problems). My main concern is getting a design that doesn't introduce signal oscillation due to feedback between the voltage and current regulators. Maybe it's an unmerited concern...I'd just like to make sure beforehand. :)
 

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