From owner-freebsd-questions@FreeBSD.ORG Sat Nov 29 05:11:29 2014 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 62241798 for ; Sat, 29 Nov 2014 05:11:29 +0000 (UTC) Received: from nm33-vm8.bullet.mail.ir2.yahoo.com (nm33-vm8.bullet.mail.ir2.yahoo.com [212.82.97.113]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 715437F7 for ; Sat, 29 Nov 2014 05:11:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rocketmail.com; s=s1024; t=1417237877; bh=8Lcw37g+ZMsRObsjO+fKZd8zk5eP6Ceblw2PUpHA2gE=; h=Date:From:To:Subject:In-Reply-To:References:From:Subject; b=khj+V294PKrXlwo73CNNVgFDM4NDYIvQwWt9RXcy33N/kwlUSTTGWI+RC7KRvPfC8dPc8ayN7AjMZ8t9Fw+ZAKJXUxuJDRV7FdT7qXwEkBpZb1BDHVf/ZJWJI6/sQNeuPjPpGRfWf4B7ffsvu1hzM7L/Xh8l1d9gACcACJ0qGzM= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=rocketmail.com; b=bRjP7Ktt9RxlszYu6cbip3WIcFhC7R4ySGeDf+Q1bVVt9SN2AL+9fjLIS5RiZNyH9zgueiWNOb8lMwRS9XTu0r6X8iyZsaKZ26Lnricp5NwrmhUEvokjcMFLTX6cniw2vOaZp0l3n7MWYsVka74QbbTiLASkzxd1KyKpdhCfo3c=; Received: from [212.82.98.61] by nm33.bullet.mail.ir2.yahoo.com with NNFMP; 29 Nov 2014 05:11:17 -0000 Received: from [46.228.39.70] by tm14.bullet.mail.ir2.yahoo.com with NNFMP; 29 Nov 2014 05:11:15 -0000 Received: from [127.0.0.1] by smtp107.mail.ir2.yahoo.com with NNFMP; 29 Nov 2014 05:11:15 -0000 X-Yahoo-Newman-Id: 324807.25633.bm@smtp107.mail.ir2.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: 4wZzJmYVM1n5rZA0z62yLTB0Xzsic9AG1KqjXAlntwuZx7l Eu9RDzxXm7nXY7W998oUUHDXYEg55BXmjEjnCCHU08St19cnexIlJ0WhWXNw LKBFvCOYpnQWn_CNLRElAtnKvlQ3Iqyr0H_xxz_rL3yTMdJoBLOQJJxgjkaT V1ljlPfF416iXqqwpLJ4TeTocpA503zLYIklwE.idq.SgzXkEAoCQ8x2Gu.F I1Thqbc5dKKKCrk37s3CrZOQ8W9uYzE3xILSGiyogMSmrA7trHVRS3alwDRX rKPYxYPkERmMfzBQYJPt0xsTIi7x0UII1mGyF3QNZCe8Gxx3s.uFCiX.vkCa RsvsKQqVDdpIlhQCaBA6Ec.8fAnlw9nnhHaTdbG46S2ZtV4Gr0IxPaP1l2SN 9FxTPWt6Zblydg88c9KokUa6S675hacKziiS5S1st3cNfIOZCS27vni2GdwZ SfS3dUL6gZ0e4Ee4EO19OSsFQC9STqPoomsi04KxsJdR5WjeOCJMWAFLyBqv tWKyPefen8mJmpkjq92s5XBNo0Bh4pSk- X-Yahoo-SMTP: BeMCPs2swBABTJ3kAeEiC_hE0mz8jRexLddJfD8pI2j32fOacjBmXg-- Date: Sat, 29 Nov 2014 06:11:14 +0100 From: Ralf Mardorf 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: <54777AB1.9010800@bluerosetech.com> <54779629.302@bluerosetech.com> <5478BD4F.7020306@yahoo.com> <5478BEE6.30308@bluerosetech.com> <5478CC08.9090307@yahoo.com> <20141128204722.561f948e@archlinux> <5478F16A.80605@yahoo.com> <54791d3a.w/pI0kak03d+3nKC%perryh@pluto.rain.com> <20141129113405.3d1bd1d6@X220.alogt.com> <20141129050405.0a17ca3a@archlinux> <20141129125235.5b55ec68@X220.alogt.com> X-Mailer: Claws Mail 3.11.1-34-g5c904ff (GTK+ 2.24.25; x86_64-arch-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 29 Nov 2014 05:11:29 -0000 On Sat, 29 Nov 2014 12:52:35 +0800 Erich Dollansky wrote: > Hi, > > On Sat, 29 Nov 2014 05:04:05 +0100 > Ralf Mardorf wrote: > > > On Sat, 29 Nov 2014 11:34:05 +0800 > > Erich Dollansky wrote: > > > On Fri, 28 Nov 2014 17:26:03 -0800 > > > Michael Sierchio 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.