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From: "Christopher R. Carlen"
Subject: Re: Core gapping techniques and general SMPS magnetics stuff
Date: Fri, 20 Dec 2002 12:04:06 -0800
Organization: Sandia National Laboratories, Albuquerque, NM USA
References: <6hNK9.982$qA3.firstname.lastname@example.org> <email@example.com> <3E02C3D0.FECBF99D@ieee.org>
NNTP-Posting-Date: Fri, 20 Dec 2002 19:03:00 +0000 (UTC)
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Harry Dellamano wrote:
> Hey Analog, you wouldn't have a spare room in you home that I could move in
> and just listen and try to absorb.
> Chris is spinning his wheels on basic equations which will only get him to
> the first layer of understanding. He has about four more layers to go to get
> to your level. I admire Chris for all his fine qualities but he is not going
> to get that inductor designed from where he is at now.
It appears you guys are real SMPS product developers. I have no
intention of ever trying to compete with highly optimized design
techniques. What's the point? To eek out an extra 5% of efficiency?
I took a scrapped E core from a burnt out computer PS, wound an inductor
in a not particularly careful manner, and made a flyback power train
that puts out the desired power and voltage with reasonably efficiency,
even with loose wiring done on a breadboard and a lowsy FET gate drive.
I have learned a great deal on the practical "get results" end from
listening to you guys, and am getting a great deal of fufillment out of
my efforts to reconcile the practical tips and tricks with the first
principles oriented mathematical theory. That is what I like to do, and
I am fortunate that working in a research environment instead of an
industry, that I can have the opportunity to do that.
But unless I'm going to try to make a new splash in the SMPS market with
more W and more % efficiency in less m^3, I really don't think I'm
going to have any trouble making a working inductor to meet my
requirements with my present abilities. My "wing-it" inductor even did
the job, so if I apply my equations to design the real inductor that
will go on in the actual project, I can only imagine it will work even
I will be conducting more experiments in the future, and putting
questions here to get more of the good feedback.
> The technique that you mentioned to avoid proximity losses is not
> applicable in Chris's case. This is an inductor and ac magnetizing current
> is the total primary current.
Thanks for the input, and...
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
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