Electronics > Projects, Designs, and Technical Stuff
Modifying a server power supply into an adjustable bench supply
<< < (2/2)
Recyclojunk64:
Hmm, well in that case I think I'll probably go with an external buck converter then. There isn't really room for any additional output inductors in the server supply anyway, I was thinking the output inductors were rather small (they are in parallel, and have two turns), now I know why.

Tomorrow I'll raid my parts boxes and see what large powdered iron torroids and mosfets I can find and hopefully I'll be able to build something that isn't too large. And maybe I'll have a linear tracking stage on the output as well eventually.

I guess the other advantage of having an external buck converter instead is that I can use it to supply more than 66A at lower voltages, though I'll have to draw the line somewhere of course when designing it. Maybe 200A max (when below 14V), or maybe more. And perhaps I might make it a buck-boost converter (non-inverting 4-switch type) for when I need more than 42V
bktemp:
At that power levels I would use a multiphase synchronous buck converter: Because they are phase shifted, the ripple at both input and output is much lower.
It also reduces the current in each stepdown, making the inductor design much easier.
flyrod:
Hello all.  I brought this thread back up because I'm interested in doing the same thing.  I want a nice bench supply with enough power to charge batteries, run motors, etc. but one that can do this is at least a few hundred dollars.  Server power supplies have good components and are much more affordable, so I think it would be a fun and useful project to modify one or use the parts to build a nice bench supply.  Has anyone had much luck doing this?


--- Quote from: bktemp on December 11, 2016, 05:48:10 pm ---At that power levels I would use a multiphase synchronous buck converter:
--- End quote ---

Are there any good sources or plans for one of these?  There are some server or telecom supplies that put out 48-50v, so as a start I could just stick one of these on it, right:?

https://www.ebay.com/itm/273509350150



This would get me adjustable voltage and constant current from the way I read the listing.

Thanks for your input!

001:

--- Quote from: flyrod on December 01, 2018, 04:29:59 pm ---Hello all.  I brought this thread back up because I'm interested in doing the same thing.  I want a nice bench supply with enough power to charge batteries, run motors, etc. but one that can do this is at least a few hundred dollars.  Server power supplies have good components and are much more affordable, so I think it would be a fun and useful project to modify one or use the parts to build a nice bench supply.  Has anyone had much luck doing this?


--- Quote from: bktemp on December 11, 2016, 05:48:10 pm ---At that power levels I would use a multiphase synchronous buck converter:
--- End quote ---

Are there any good sources or plans for one of these?  There are some server or telecom supplies that put out 48-50v, so as a start I could just stick one of these on it, right:?

https://www.ebay.com/itm/273509350150



This would get me adjustable voltage and constant current from the way I read the listing.

Thanks for your input!

--- End quote ---

You can try to get up to 50 volts and up to 200 ampers from dirty cheap china welding inverter
flyrod:

--- Quote from: 001 on December 01, 2018, 08:22:11 pm ---You can try to get up to 50 volts and up to 200 ampers from dirty cheap china welding inverter

--- End quote ---

The point is to get adjustable voltage and current for use as a bench supply.  It seems that a name brand server supply would have better components than a chineze bench supply.  I saw a 50v 40A HP blade server supply on fleabay for $20 shipped.  But maybe I should just buy a cheap bench supply.  I was looking at this one:


from here:

http://tekpower.us/power-supply/switching-powersupply/tp3030e.html

I found someone talking about it here:

https://www.eevblog.com/forum/reviews/teardown-tekpower-tp3030e-30v30a-adjustable-switching-power-supply/

Does anyone have suggestions?



Navigation
Message Index
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod