Date: Sat, 29 Nov 2014 06:11:14 +0100 From: Ralf Mardorf <ralf.mardorf@rocketmail.com> To: freebsd-questions@freebsd.org Subject: Re: [Bulk] Re: [Bulk] Re: OT: UPS for FreeBSD Message-ID: <20141129061114.0dc6ad4a@archlinux> In-Reply-To: <20141129125235.5b55ec68@X220.alogt.com> 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> <20141129125235.5b55ec68@X220.alogt.com>
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On Sat, 29 Nov 2014 12:52:35 +0800 Erich Dollansky <erichsfreebsdlist@alogt.com> wrote: > 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? 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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