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From: "Christopher R. Carlen"
Subject: Re: My flyback experiment is on the web
Date: Thu, 17 Oct 2002 15:55:44 -0700
Organization: Sandia National Laboratories, Albuquerque, NM USA
References: <3DAA0563.9040507@BOGUS.earthlink.net> <firstname.lastname@example.org> <3DAB8ABA.4030602@BOGUS.earthlink.net> <email@example.com> <3DAC188B.7D82A78E@rica.net> <3DAC2D91.firstname.lastname@example.org> <3DAC688E.9C870D83@rica.net>
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John Larkin wrote:
> You can think of this as a ringing L-C in which the C is highly
> nonlinear. If fact, this is what's going on. When the ring goes below
> ground, which it wants to do, the substrate diode acts like a big
> capacitor. So the 'spikes' are fast rings and the baseline zones are
> slow rings. This isn't exactly right (the diode is nonlinear, and the
> stored charge doesn't behave exactly like a capacitor) but
> qualitatively this is about what's going on. A simple diode-L-C
> circuit with proper initial conditions will ring just like this.
> Once the ringing dies down enough that it no longer dips below ground,
> you'll see the damped sine you expect. In this example, the next drive
> pulse arrives too soon to let this happen.
> But the gate is off.
I guess I should take a scope trace of the ring at a lower frequency but
with the same energy in the inductor.
Then we can have experimental data to compare with the hypothesis.
I'll see if I can get it in the next couple days.
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
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