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Topics - Cherenkov11

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Solid state Tesla coils / [SOLVED] Performance Issues in SSTC
« on: October 07, 2019, 05:08:34 PM »
Hi, I'm Andrew

I´ve been working on my SSTC 2 by Loneoceans. Basically I did the same circuit except for the under voltage protection and instead of current transformer feedback I used a simple antenna.

Using a transformer for stepdown the main voltage to a more secure voltage for testing, giving me ~160 volts DC on the bus.  It works relatively well without a topload, giving nice 5-6 cm sparks with no skipping pulses.

But, for lower the resonant frecuency I added a topload, a small toroid, but for my surprise, it does not work well, start to skipping a lot of pulses, no matter where I place the the antenna. The length of the arc maintain mostly the same, maybe a little bit bigger, but thinner. But the problem is that it works very unreliably and most of the time it doesn't even work.

I don't like to use it without a topload, because the UCC get pretty hot at high pulse rates (I think maybe relate to the high resonance frecuency creating a lot of power switching loses).

I've been trying different lengths of antenna, changing the distance between my secondary coil and the antenna, I even change the circuit in the antenna, putting the capacitor before the clamping diodes and not after as Loneoceans' schematic shows, removing the 1k resistor before de 74HC14, using 1n5818 and 1n60 diodes for clamping but no help.

I hope you guys can help me.

Photo album

Regards, Andrew

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