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4hv.org :: Forums :: Tesla Coils
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PLL SSTC

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MRacerxdl
Sat Oct 04 2008, 06:16PM Print
MRacerxdl Registered Member #989 Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
Hi all, I am making a new SSTC. now with PLL,

I sampled 4 TO-263 Mosfets (200V 18A) and made a fullbridge. Tested with common SSTC circuit, the bridge get a little heat with 4A drawn from 127Vac Mains.
Bridge Photo:
Link2

I can get ~8cm streamers from that configuration (running at 244kHz)
Link2

Ok, but when I put the PLL to work, after some time it locks at 210kHz (not 244kHz) and I get only a few cm sparks (not streamers).

I am using the Steve Conners PLL Driver but with 2,35nF Cap and 800R and 1,5k resistors.

What could be wrong?
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...
Sat Oct 04 2008, 07:43PM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
You need to use a smaller capacitor (or smaller resistors) to move the center frequinecy to match your coil.
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uzzors2k
Sat Oct 04 2008, 07:59PM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
What's the range of the PLL? My coil has fres at 265kHz, and I use 10k, 3.3k and 1nF for timing components. You might want to try them instead, you should get a range of about 190 - 333kHz. How long does it take for the coil to drift out of fres, and where is your potentiometer at? If the range is right but you have to turn the pot all the way in one direction to lock, then reverse the primary leads. That fixes the phase shift so you can keep the potentiometer near the center of it's range instead.
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MRacerxdl
Sun Oct 05 2008, 01:21AM
MRacerxdl Registered Member #989 Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
The frequency range of that (2,35nF and 800 to 1,5k) is 200-280 khz ~

About the potentiometer, I didnt put one (only two 5k resistors in series with center tap) I will try to put one and adjuste the phase shift.
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