Switch mode supplies

[atec77]

I have the need for a high current 50Vdc supply (20amp), to maximise rx
when the power is not needed will the supply handle being switched off
and on regularily when being used ?
Anyone have a clean schematic and any salient words as the cost of a
good transformer is quite prohibitive so a switch mode might be a solution
Tnx in advance
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[ian field]

"atec77" <atec77@hotmail.com> wrote in message
news:i3o609$lj9$1@news.eternal-september.org...

I have the need for a high current 50Vdc supply (20amp), to maximise rx
when the power is not needed will the supply handle being switched off and
on regularily when being used ?
Anyone have a clean schematic and any salient words as the cost of a good
transformer is quite prohibitive so a switch mode might be a solution
Tnx in advance

AFAIK telecoms gear mostly uses 48V, so you might be able to get a ready
made PSU off the shelf and tweak it up a couple of volts - or better yet,
cheap surplus gear.

 

[atec77]

On 10/08/2010 12:17 AM, ian field wrote:

"atec77"<atec77@hotmail.com> wrote in message
news:i3o609$lj9$1@news.eternal-september.org...
I have the need for a high current 50Vdc supply (20amp), to maximise rx
when the power is not needed will the supply handle being switched off and
on regularily when being used ?
Anyone have a clean schematic and any salient words as the cost of a good
transformer is quite prohibitive so a switch mode might be a solution
Tnx in advance

AFAIK telecoms gear mostly uses 48V, so you might be able to get a ready
made PSU off the shelf and tweak it up a couple of volts - or better yet,
cheap surplus gear.


Exactly what I need but where . very little on ebay , I could run two

units at 1kw each I guess
Of course if I had a suitable tranny making one might be an option but
switch mode has appeal

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[Mark Harriss]

atec77 wrote:

On 10/08/2010 12:17 AM, ian field wrote:
"atec77"<atec77@hotmail.com> wrote in message
news:i3o609$lj9$1@news.eternal-september.org...
I have the need for a high current 50Vdc supply (20amp), to maximise rx
when the power is not needed will the supply handle being switched
off and
on regularily when being used ?
Anyone have a clean schematic and any salient words as the cost of
a good
transformer is quite prohibitive so a switch mode might be a solution
Tnx in advance

AFAIK telecoms gear mostly uses 48V, so you might be able to get a ready
made PSU off the shelf and tweak it up a couple of volts - or better yet,
cheap surplus gear.


Exactly what I need but where . very little on ebay , I could run two
units at 1kw each I guess
Of course if I had a suitable tranny making one might be an option but
switch mode has appeal

I've had two such units made by a Japanese telecoms company NEC for their
PABX's and they were large complex units with 40A capacity and I picked
them up for free. I doubt you'd make one easier and cheaper than a mains
transformer/rectifier based unit. You could try the local NEC agent and
see if they are scrapping out a unit.