RE: [TCML] DRSSTC weird waveform behavior

[Justin B <boshjack@xxxxxxxxxxx>]

The one im using is similar to Steve wards DRSSTC schematics, http://stevehv.4hv.org/newdriver08/DRSSTC_pndriver1_3b.pdf

Due to the fac this is a PCB, i cant really update it to have the Phase lead adjustments, so I plan to add an adjustable inductor + resistor in parallel to the feedback CT

> From: tyler.c.c@xxxxxxxxx
> Date: Fri, 1 Jul 2011 18:12:54 -0400
> Subject: Re: [TCML] DRSSTC weird waveform behavior
> To: tesla@xxxxxxxxxx
> 
> What driver design are you using (specifically the current sensor aspect)?
> This looks to me to just be a controller with quite a few propagation delays
> so the switch action is substantially after the zero crossing, which can
> lead to serious ringing. This is why the prediktor current sense circuit was
> made.
> 
> Tyler
> 
> 
> On Fri, Jul 1, 2011 at 6:01 PM, Justin B <boshjack@xxxxxxxxxxx> wrote:
> 
> >
> > Hello, Recently been working on my DRSSTC seeing what my ZCS is.  Came to
> > find I have large voltage spikes, and my switching is late.
> >
> > After getting tips and suggestions from Kizmo, I have moved the gate
> > resistor from 5ohms to 10ohms, which killed my spike down a little.  Then
> > also he told me Steve had a similar issue, and fixed it with a 20 ohm
> > resistor. seen here (
> > http://www.stevehv.4hv.org/DRSSTC2/waveforms/badoutput.JPG)  So im sure
> > the simple fix to my overshoot is to do the same. Add resistors.  But what I
> > want to know, What the heck is the deal with the high squiggles on the
> > Output voltage? If i adjust the duty cycle to ONE more cycle, it mirrors
> > over the horizontal.  1 more cycle, mirrors again.
> >
> > So, Here are my waveforms.
> >
> > With 5.1 ohm resistor on the gates
> > http://i.imgur.com/pUJvR.jpg
> > http://i.imgur.com/GlcAU.jpg
> >
> > with 10ohm resistor on the gates
> > http://i.imgur.com/ZrfeX.jpg
> > http://i.imgur.com/JMKIF.jpg
> >
> > But what the heck is this??
> > http://i.imgur.com/nfcC7.jpg
> >
> > Any help is wonderful, Thanks =)
> > --Justin B
> >
> >  _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
 		 	   		  _______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla