Date: Sat, 29 Nov 2014 10:44:46 +0100 From: Ralf Mardorf <ralf.mardorf@rocketmail.com> To: freebsd-questions@freebsd.org Subject: Re: [Bulk] Re: OT: UPS for FreeBSD Message-ID: <20141129104446.7850b1b4@archlinux> In-Reply-To: <54798883.saa13h6lE6rPwZCf%perryh@pluto.rain.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> <54798883.saa13h6lE6rPwZCf%perryh@pluto.rain.com>
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On Sat, 29 Nov 2014 00:49:07 -0800 perryh@pluto.rain.com (Perry Hutchison) wrote: > multitapped > 120VAC ==> step-down ==> 6VAC ==> full-wave ==> ~15VDC ==> battery1 > transformer rectifier > | > +---> 3VAC ==> full-wave ==> ~7.5VDC ==> battery2 > rectifier > > battery1 ==> regulator ==> 12VDC > > battery2 ==> regulator ==> 5VDC > > IOW the computer runs off the batteries, which are charged by the > stepped-down but unregulated (or minimally-regulated) line voltage. And that already is done and is one design I was thinking about, but I called it the wrong name, Wiki likely knows what the correct name for this design is. As a side effect this is a good mains filter. Another design is possible, perhaps enlarging the lifespan of the batteries, because they are only used when needed and using a switching power supply should be possible too. Regards, Ralf PS: I wonder if consumers are aware that lightning arresters provided by multi-outlet power strips alone don't protect. The protection needs 3 steps, 2 steps must be provided by the buildings electric. The lightning arresters provided by multi-outlet power strips is just the last step, useless without the 2 other steps. Lightning protection in Germany is much more needed, than protection in case of a blackout.
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