Date: Sat, 21 Nov 2020 19:04:10 -0800 From: <soralx@cydem.org> To: Brett Glass <brett@lariat.org> Cc: Ralf Mardorf <silver.bullet@zoho.com>, <freebsd-chat@freebsd.org> 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>
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> [...] > 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 LThelp
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