[Bulk] Re: [Bulk] Re: OT: UPS for FreeBSD

Ralf Mardorf ralf.mardorf at rocketmail.com
Sat Nov 29 05:11:29 UTC 2014


On Sat, 29 Nov 2014 12:52:35 +0800
Erich Dollansky <erichsfreebsdlist at alogt.com> wrote:

> Hi,
> 
> On Sat, 29 Nov 2014 05:04:05 +0100
> Ralf Mardorf <ralf.mardorf at rocketmail.com> wrote:
> 
> > On Sat, 29 Nov 2014 11:34:05 +0800
> > Erich Dollansky <erichsfreebsdlist at alogt.com> wrote:
> > > On Fri, 28 Nov 2014 17:26:03 -0800
> > > Michael Sierchio <kudzu at tenebras.com> wrote:
> > > 
> > > > I've always found it amazingly absurd that you use a UPS (a bank
> > > > of batteries charged by AC->DC conversion), invert it back to
> > > > AC, which gets converted to DC for the motherboard and
> > > > peripherals.
> > > 
> > > a long time, this was not the case. It was the time when linear
> > > power supplies were the standard. A batterie was supplying
> > > electricity via a diode to the DC input of the voltage regulator.
> > > 
> > > As switching voltage regulators use a few hundred volts, it is a
> > > bit difficult to match this with a battery.
> > 
> > Instead of getting an UPS to feed the PSU, it would be smarter to
> > replace the computer's PSU with a combination of UPS and PSU.
> > There's no good reason for a double conversion.
> 
> have you ever tried to make two voltage regulators feed the same
> output?

You're thinking of a design were a PSU voltage regulator output and an
UPS voltage regulator output brought together to one output.

That's not the design I've got in mind. Perhaps "a combination of UPS
and PSU" is an unfortunate choice of words.


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