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Reply-To: "fred bartoli"
From: "fred bartoli"
Newsgroups: sci.electronics.design
References: <3DAA0563.9040507@BOGUS.earthlink.net> <3daafdb7$0$11215$1b62eedf@news.euronet.nl> <3DAB8ABA.4030602@BOGUS.earthlink.net> <871568ec.0210150338.4dc52cb9@posting.google.com> <3DAC188B.7D82A78E@rica.net> <3DAC2D91.9020902@sandia.gov> <3DAC688E.9C870D83@rica.net>
Subject: Re: My flyback experiment is on the web
Date: Thu, 17 Oct 2002 10:29:09 +0200
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Message-ID: <3dae7478$0$240$626a54ce@news.free.fr>
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Bob Wilson a écrit dans le message :
uqsbu633tpa76a@corp.supernews.com...
> In article <3DAC688E.9C870D83@rica.net>, jpopelish@rica.net says...
> >
> >"Christopher R. Carlen" wrote:
> >>
> >> John Popelish wrote:
> >
> >> > I think these pulses are actually ringing in the gate drive line,
> >> > since they show very brief current ramps in the source current that
> >> > coincide with small positive gate voltage pulses. If the pull down
is
> >> > brought a little negative, or stiffened I think these pulses would
> >> > disappear, and losses would go down.
> >> >
> >>
> >> See Fred Bartoli's response, he's explained it right. And my reply to
> >> Don Pearce.
> >>
> >> Good day!
> >
> >I disagree with you and Fred. The ringing should be a damped
> >sinusoid, not a series of fractional sine pulses if it were just
> >ringing.
>
> Quite correct. Rather obvious, actually, since ringing is simply a damped
LC
> tank (usually parasitic) that is excited into resonance.
>
> Bob.
>
Who's quite correct ?
See my first answer to John.
The pulse shaping is due to the long recovery time of the MOS diode.
Try a simulation replacing the MOS with a perfect switch and a diode and
vary the recovery time from 0 to 500ns and see what happens.
The series of pulse is the obvious.
Regards,
Fred.
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