From owner-freebsd-questions@FreeBSD.ORG Sat Nov 29 04:52:41 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 2C2B334F for ; Sat, 29 Nov 2014 04:52:41 +0000 (UTC) Received: from alogt.com (alogt.com [69.36.191.58]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id F3FAC604 for ; Sat, 29 Nov 2014 04:52:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=alogt.com; s=default; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To:From:Date; bh=raQnU6piZf5DkrYa6exnhq+AO27vZlA4TfN2AC5n1IQ=; b=uDwMiscM2K1v45Gl6XyMqqMgmdfLfx6lmqzS41htDGPCh93UuaDtZ5PTjucblfIhJazwJpmPpfzUw9LHEqYlmBSoUHjx6QXqLMsaCk1bYXbOIr15RqKnHlVx9FTOlchmK/SSfkn2qWRObEuS3I/HojmzOZmH97dWkK6Omt431nY=; Received: from [114.121.160.118] (port=28257 helo=X220.alogt.com) by sl-508-2.slc.westdc.net with esmtpa (Exim 4.84) (envelope-from ) id 1Xua1P-003ZFp-Bf; Fri, 28 Nov 2014 21:52:40 -0700 Date: Sat, 29 Nov 2014 12:52:35 +0800 From: Erich Dollansky To: Ralf Mardorf Subject: Re: [Bulk] Re: OT: UPS for FreeBSD Message-ID: <20141129125235.5b55ec68@X220.alogt.com> In-Reply-To: <20141129050405.0a17ca3a@archlinux> 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> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - sl-508-2.slc.westdc.net X-AntiAbuse: Original Domain - freebsd.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - alogt.com X-Get-Message-Sender-Via: sl-508-2.slc.westdc.net: authenticated_id: erichsfreebsdlist@alogt.com X-Source: X-Source-Args: X-Source-Dir: Cc: freebsd-questions@freebsd.org 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 04:52:41 -0000 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? Erich