From: Fred Bloggs
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Subject: Re: V regulator input cap size?
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Date: Sun, 03 Nov 2002 00:39:49 GMT
NNTP-Posting-Date: Sat, 02 Nov 2002 16:39:49 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
John Fields wrote:
> On Sat, 02 Nov 2002 20:59:23 GMT, Fred Bloggs
>>John Fields wrote:
>>>On Sat, 02 Nov 2002 11:17:55 GMT, "Spehro Pefhany"
>>>>(BTW, I'm NOT going to do a detailed design, the information
>>>>is too sketchy, my aim was to show a concept not to complete a design, and
>>>>I don't have time right now to make arbitrary assumptions and labor to
>>>>satisfy the resulting constraints. The process is obvious to anyone
>>>>"skilled in the art" as the patent guys say, and we've shipped a lot of
>>>>product with similar designs, so *I* know it works very well indeed).
>>>It does, in fact, work wery well.
>>>I've used the same and similar designs myself many times and never
>>>had problems with them. (Yet!^)
>>>I just started on the front end of the detailed design to have some
>>>fun with Bloggs, who responded as I expected he would...
>>Okay- well be sure to keep us apprised of your progress-))
> I have a better idea...
> Since I found a relay with a coil which matches the OP's and worked
> out the coil pickup and dropout currents as a function of temp and
> coil resistance tolerances as well as tidying up the mains tolerance
> thing, why don't you take over and work on the rest of it until you
> get stuck?
Hmmm-some people are too clueless to get stuck. It is clear from your
approach that you are unaware of the tolerance spread on the
mechanicals. Unlike a performance histogram plot for the much more
precisely manufactured semiconductor products, the typical relay plot
may have only 30% of products clustered negligibly close to "typical"
with a fairly sizable percentage of outliers. You may have as much as
10% with pickup levels exceeding 90% nominal at room temp, and in either
case as the wire/core temp increases towards 100C even the "typicals"
shift up towards 100% nominal.
> In the meantime, I'll work on optimizing my reactive supply
This project may be beyond your capabilities, but good luck anyway.