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Reply-To: "fred bartoli"
From: "fred bartoli"
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>
Subject: Re: My flyback experiment is on the web
Date: Thu, 17 Oct 2002 10:29:09 +0200
X-Newsreader: Microsoft Outlook Express 5.00.2314.1300
Organization: Guest of ProXad - France
NNTP-Posting-Date: 17 Oct 2002 10:27:36 MEST
Bob Wilson a écrit dans le message :
> In article <3DAC688E.9C870D83@rica.net>, email@example.com 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
> >> > 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
> Quite correct. Rather obvious, actually, since ringing is simply a damped
> tank (usually parasitic) that is excited into resonance.
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.
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