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From: email@example.com (john jardine)
Subject: Re: My flyback experiment is on the web
Date: 15 Oct 2002 04:38:07 -0700
References: <3DAA0563.9040507@BOGUS.earthlink.net> <firstname.lastname@example.org> <3DAB8ABA.4030602@BOGUS.earthlink.net>
NNTP-Posting-Date: 15 Oct 2002 11:38:07 GMT
Chris Carlen wrote in message news:<3DAB8ABA.4030602@BOGUS.earthlink.net>...
> Frank Bemelman wrote:
> > Just a question to thicken the plot: is your 1 ohm current sense resistor
> > wirewound, and does it have an inductance too ?
> I honestly don't know, but am inclined to think it isn't. It's a little
> precision resistor, strange looking black cigar shaped thing, about 1W 1%.
> But it has a very small diameter, so it can't have much inductance. I
> suppose that could slow the FET turn-on by allowing the source to rise
> up on the rising edge of the gate pulse.
> But it seems to me there'd be some tell-tale signs of this, like a
> segment of exponential rise in the current ramp before flattening out to
> a linear ramp. But this isn't happening.
> OTOH the little ring bursts coinciding with the gate drive edges could
> be coming from this resistor, if it is a wirewound.
> I am planning to get some for certain non-inductive current measuring
> resistors in my next ordering cycle.
> What I'd really love to have is a good high frequency and high voltage
> differential voltage probe, so I could stick a resistor in the drain
> instead of the source. Maybe I should learn how to use a current tranny?
> Good day!
I rarely design these things so I'm wondering what's the
burst of 6, clean, decaying spikes?/echoes?/ringing? things that are
turning up way after the the main pulse?. No one seems to have
mentioned them, so I
assume they are a normal expected artefact. What causes them?, what
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