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Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
Hi all, I made a new DRSSTC, with new driver and new secondary and primary (new toroid too)
The primary was made with a copper tubing in a 12'' cardboard support... The secondary is with a 15x45cm tube with wire 30AWG 1683 turns, the Fres with the topload goes to 107Khz, my primary and secondary is tuned for 105Khz ( I think it doesnt is a problem is it?), the primary cap is 114nF 3200VDC
Ok Turned on everthing, and I noticed that spark isnt in the size that it needs to be, about 150VDC input and less than 10cm (on other secondary/topload I get 30cm). Changed the coil from the place (as you can see in the picture, the coil is much near the wall, that changes the fres), now its on the middle of my room. The sparks increased a little but when I reach 150VDC I didnt get the 30cm sparks, and sometimes I can hear and see an arc goes from the middle of the primary, passing through the cardboard and hiting the primary.
What can be the problem? Cardboard isnt good for primary support?
Registered Member #1911
Joined: Mon Jan 05 2009, 06:30PM
Location: Salem, Oregon, USA
Posts: 165
To be honest, I know next-to-nothing about SSTCs, let alone DRSSTCs. I simply have a comment/question for you.
Your driver circuitry looks cleanly wired, but doesn't having the wire that long on the GDTs translate to more interference in your primary circuit from the coil?
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Plasma Lover wrote ...
To be honest, I know next-to-nothing about SSTCs, let alone DRSSTCs. I simply have a comment/question for you.
Your driver circuitry looks cleanly wired, but doesn't having the wire that long on the GDTs translate to more interference in your primary circuit from the coil?
That seems to be a CT, not GDT. I am guessing primary over current detector. That would not cause a problem surely, all it has to do is 'give out' the right amount of voltage after the shunt resistor. Unless he is picking up insane noise, i would hope it didn't matter.....
Hmm, on second thought, if you get noise, perhaps it is showing over current?
EDIT: I did not see the pic of the GDT! Sorry Plasmalover!
Well, perhaps you should shorten those wires. You might be getting a bad signal, with ringing or something. Is heating bad? Do the IGBT's die? I am sure you could answer whether the driver is not acting right before me. I do know someone that had 6 inch long GDT wires which caused too much ringing and cause excessive heating, so i am sure a foot longer would not help! That could be picking up bad stuff from the secondary or perhaps just ringing badly.
Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
I tryed to reduce the GDT wiring (to the minimal possible in there, but it didnt make any difference... The IGBT's are fine, even if I run at fullpower, it doesnt blow (at least for only a minute running, I didnt tryed more) The strange thing is that I increased the primary cap on that coil, its about 2,5 times than my before DRSSTC, and with 150VDC other DRSSTC was 25-30 cm sparks, that only gaves me 10cm...
About the coupling, I think its better to I get the primary windings close than put the secondary higher doesnt it? I will try to raise the secondary, but I think that will reduce more the ouput sparks...
Only for reference on the photo, the GDT is the blue core, the CT is the two black cores (the longer wire), on the second photo you can see my old DRSSTC Primary (white pvc with blue wires) and the old cap bank (47nF 6400V)
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DRSSTC - Primary and Secondary Flashover
