[Amps] 50V SMPSU for SSPA (was: Re: Peter Dahl transformers)

[Mike Tubby]

On 22/02/2013 19:14, Bill Turner wrote:
> ORIGINAL MESSAGE: 
> On Fri, 22 Feb 2013 14:51:36 +0000, Mike wrote:
>
>> Why would you want to build a 50V 50A 2500W supply (other than for the
>> challenge) when you can buy a HP supply on Ebay for $30-40... just put
>> "HP 48V 3000W" in to your ebay search ;-)
> REPLY: 
> Good point. I did a search as above and found six for sale on eBay as of
> now. 
>
> Do you (or anyone) know anything about these supplies? Is the 3 kW rating
> CCS? How well regulated and filtered?

I haven't tested one myself yet but have a friend in the HP server
repair trade that has just acquired three for me... there's a thread
over here:

http://endless-sphere.com/forums/viewtopic.php?f=7&t=32829

pin out here:

http://www.rcgroups.com/forums/showthread.php?t=1625284

that discusses getting them to power up and how they work.

Several amateurs using them, for example Hans PE1CKK:

http://www.youtube.com/watch?v=io3KeGlJmCs&playnext=1&list=PL92FB9A255B30B6B1&feature=results_video


To date, I have used the Meanwell/Sunpower RSP-1500-48 and the
RSP-3000-4 supplies. At one point Future Electronics (USA) were selling
the RSP-3000 for less than the RSP-1500 - this may have been a mistake
but I bought one all the same and including shipping and taxes it cost
me €341 (£271) which was a good price, but this was before I even knew
of the HP units...

There are some other routes to QRO 50V - the telecomms industry uses a
lot of 48V supplies, often battery banks charged by 'rectifiers'. Modern
rectifiers are effectively switched-mode power supplies. You will find a
range of supplies in the 1000, 1500, 2000, 3000W ranges made by Eaton,
Valerie and Eltek if you search Ebay - many of these make good PSUs for
SSPA projects.


> Looks like a great bargain. 
>
> Thanks,
>
> Bill, W6WRT
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