From owner-freebsd-chat@freebsd.org Sun Nov 22 03:04:14 2020 Return-Path: Delivered-To: freebsd-chat@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id D84D247AF1E for ; Sun, 22 Nov 2020 03:04:14 +0000 (UTC) (envelope-from soralx@cydem.org) Received: from smtp.triumf.ca (smtp.triumf.ca [142.90.100.195]) by mx1.freebsd.org (Postfix) with ESMTP id 4Cdw9T746Tz4TB1 for ; Sun, 22 Nov 2020 03:04:13 +0000 (UTC) (envelope-from soralx@cydem.org) Received: from mscad14 (mscad14.triumf.ca [142.90.115.36]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.triumf.ca (Postfix) with ESMTP id 7D891F804; Sat, 21 Nov 2020 19:04:12 -0800 (PST) Date: Sat, 21 Nov 2020 19:04:10 -0800 From: To: Brett Glass Cc: Ralf Mardorf , Subject: Re: Sustainability of switching power supplies Message-ID: <20201121190410.05900614@mscad14> In-Reply-To: <202011220030.RAA29768@mail.lariat.net> References: <20201121092444.2355c5a7@utnubu> <202011220030.RAA29768@mail.lariat.net> X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; amd64-portbld-freebsd9.3) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4Cdw9T746Tz4TB1 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=neutral (mx1.freebsd.org: 142.90.100.195 is neither permitted nor denied by domain of soralx@cydem.org) smtp.mailfrom=soralx@cydem.org X-Spamd-Result: default: False [-2.67 / 15.00]; MID_RHS_NOT_FQDN(0.50)[]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-0.999]; RCPT_COUNT_THREE(0.00)[3]; TO_DN_SOME(0.00)[]; R_SPF_NEUTRAL(0.00)[?all]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[cydem.org]; NEURAL_HAM_LONG(-1.00)[-1.000]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_MED(-0.20)[142.90.100.195:from]; NEURAL_HAM_SHORT(-0.97)[-0.968]; FROM_NO_DN(0.00)[]; RCVD_NO_TLS_LAST(0.10)[]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_TWO(0.00)[2]; ASN(0.00)[asn:36391, ipnet:142.90.64.0/18, country:CA]; MAILMAN_DEST(0.00)[freebsd-chat]; FREEMAIL_CC(0.00)[zoho.com,freebsd.org] X-BeenThere: freebsd-chat@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Non technical items related to the community List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 22 Nov 2020 03:04:14 -0000 > [...] > and/or still in supply chains. But even good electrolytics are essentially > quick-charging batteries and do fail more often than other components.) > > That's why Glass's Law of Electronic Diagnosis states: Whenever you > are asked about the > failure of an electronic device, simply say, "It's the power suppply." These days, the law does not hold. Power supply failures are rather infrequent, and will be encountered even less in the future. Most products utilize switching PSUs nowadays (due to low cost, size & & weight, and efficiency). Thanks to improvements in solid-state electronics, switching frequencies in MHz range are now the norm; fast-switching PSUs require relatively little capacitance in high- -current paths, which can be satisfied with reliable MLCC (ceramic) and polymer types. Semiconductor devices used in modern mainstream PSUs run much cooler that before, too, so have exponentially longer life (in accordance with Arrhenius equation). > You will be correct about 99% of the time, and since you came up > with the right answer > before you even looked, you'll be considered to be either psychic > or a bloody genius. ;-) > > --Brett Glass -- [SorAlx] ridin' VN2000 Classic LT