Re: Convert ATX PSU to run on 192V DC rail
From: ric (nospam_at_home.com)
Date: 06/11/04
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Date: Fri, 11 Jun 2004 00:03:07 -0700
WiseIndian wrote:
> >A SMPS peak charges the input caps to 1.414 times the input voltage.
> So, >200VAC would result in about 283VDC on the caps.
> true but considering that we run on clean battery power is it
> necessary to
> have them caps fully charged ?
At a 230vac input rating, a SMPS will "breakout" at about 170vac, at
which time about 240vdc will be on the HV buss. This is at full load.
Whether or not it will go much lower depends on the load and on the
design of the PSU.
> actually i dont know too much about smps supplies, but since the smps
> is
> suppose to work in the range of 90-150V or 190-250V wouldnt that fall
> in the band on 192VDC?
Actually, it is 90-132 vac. 132vac would result in about 370VDC on
the buss (due to doubling), and 180vac would result in about 254VDC.
You would have to modify the supply to stop the doubling, and use
the 90-132 setting (and pray.)
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