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Date:      Sat, 29 Nov 2014 12:52:35 +0800
From:      Erich Dollansky <erichsfreebsdlist@alogt.com>
To:        Ralf Mardorf <ralf.mardorf@rocketmail.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: [Bulk] Re: OT: UPS for FreeBSD
Message-ID:  <20141129125235.5b55ec68@X220.alogt.com>
In-Reply-To: <20141129050405.0a17ca3a@archlinux>
References:  <CAHieY7QGp2ELF-R91eu=vSrPsimVmVNJQ4kfucQ56PR7EEZmig@mail.gmail.com> <m57qdq$did$1@ger.gmane.org> <54777AB1.9010800@bluerosetech.com> <m581p1$65m$1@ger.gmane.org> <54779629.302@bluerosetech.com> <alpine.BSF.2.11.1411271433320.60866@wonkity.com> <5478BD4F.7020306@yahoo.com> <5478BEE6.30308@bluerosetech.com> <5478CC08.9090307@yahoo.com> <20141128204722.561f948e@archlinux> <5478F16A.80605@yahoo.com> <CABhTyc9m7fOoeV170dj=foAhmyYWphzc8KD8wBacu5gNRPhT%2BQ@mail.gmail.com> <54791d3a.w/pI0kak03d%2B3nKC%perryh@pluto.rain.com> <CAHu1Y71vVbdx6Yd1VbE7kb_8k9O5UG93RXEaORPU0tULCpMsCQ@mail.gmail.com> <20141129113405.3d1bd1d6@X220.alogt.com> <20141129050405.0a17ca3a@archlinux>

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Hi,

On Sat, 29 Nov 2014 05:04:05 +0100
Ralf Mardorf <ralf.mardorf@rocketmail.com> wrote:

> On Sat, 29 Nov 2014 11:34:05 +0800
> Erich Dollansky <erichsfreebsdlist@alogt.com> wrote:
> > On Fri, 28 Nov 2014 17:26:03 -0800
> > Michael Sierchio <kudzu@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?

Erich



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