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Re: PLL SSTC

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

I think Steve Conner has done the most with PLL solid state Tesla coil stuff:

http://scopeboy.com/tesla/index.html

http://scopeboy.com/tesla/dwsstc/wk2.html

The problem is Tesla coil waveforms like this:

http://hot-streamer.com/temp/NightmareWave.gif
Fricking had for a PLL to track!! But Steve has been the most successful! I think he has better stuff now...
Most other designs use "fast" zero crossing detectors on the primary current to do it all in real time: 

http://drsstc.com/~terrell/schematics/MainController-1.0.pdf

http://drsstc.com/~terrell/schematics/CurrentMeasurement.gif

http://drsstc.com/~terrell/schematics/OpticalGateDrive-1.0.pdf'

http://drsstc.com/~terrell/schematics/H-Bridge-1.0.pdf

Connor, Ward, and certainly Dan do better then "me" here ;-))

http://scopeboy.com/tesla/

http://www.stevehv.4hv.org/SSTCindex.htm

http://www.easternvoltageresearch.com/
The "real thing" would be to have a uP hard number crunch it all in real time... I have "imagined" doing it with this: 

http://www.parallax.com/dl/docs/prod/prop/PchipBlockRev.pdf

But just "pie in the sky" ;-))
I got some 4046's once but never used them since the fast real time stuff was better for me. 

Cheers,

        Terry


At 10:22 PM 9/4/2006, you wrote:

Dear forum members,
I believe few members of this forum have used a PLL (4046) to 'auto-tune' the SSTC. I'm trying to build a similar system. I believe due to noise and (or other reasons?), the PLL would go out-of-tune and this may (or may not?) result in HARD switching of IGBTs/MOSFETs in the switching circuits or sometimes may result in huge currents drawn from the switching circuit. So, is there a way to find out if the PLL is 'in tune' or not? Has anyone used the 'Phase Comparator Pulse Output' (Pin #1) in CD4046BC? Please help. 

Thanks and regards,
Rajesh.