Date: Mon, 15 Mar 1999 12:41:35 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: "Kenneth D. Merry" <ken@plutotech.com>, smp@csn.net, hackers@FreeBSD.ORG Subject: Re: power-off without halt Message-ID: <199903152041.MAA02388@apollo.backplane.com> References: <199903151941.MAA20523@panzer.plutotech.com> <199903152001.MAA02187@apollo.backplane.com>
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: e.g. IT=CV, T=CV/I. Assume 60W @ 110V yields half an amp. The caps on : the diode bridge will probably level off at 50V or so and the switching : regulator will be able to regulate down to, say, 20V. So, for example: : : T=CV/I T=(1000uF * 20V)/500mA = 40 mS of good power after AC failure. Oops. that should be 30V. 50V-20V = 30V. T=CV/I T=(1000uF * 30V)/500mA = 60 mS of good power after AC failure. -Matt Matthew Dillon <dillon@backplane.com> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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