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Messages - Thunderstruck
41
« on: February 07, 2019, 12:20:52 PM »
Excellent ! Thanks for the info. DRSSTC is a bit too complex for me right now, i need to get my simple SSTC working first, then hopefully I can move onto something more challenging.
42
« on: February 07, 2019, 11:27:44 AM »
Thanks for the info, next up, we have some legless components 3 x G40N60UFD Ultra Fast IGBT 2 x F30U60DN Ultra Fast Recovery Rectifiers Are these any good for SSTC ? With this much speed I’ll be surprised if they aren’t !! They test OK, and yes I know they should live in an anti static bag , which they do.
43
« on: February 05, 2019, 09:25:47 AM »
Thanks Mads, it's clear now. My FG is ancient, no data display, just an on led and a large knob, so yes, it might be doing strange things. In the meantime I organised a top load 150mm and 180mm spheres ( 8pF and 10pF or thereabouts ). Fitting for a breakout point on top.
44
« on: February 04, 2019, 11:38:43 PM »
Teravolt, thanks for the links, a lot of interesting reading there. I have some time to read before my components turn up.
Mads, now I understand why driving the circuit from the FG is not a good idea - it does not allow itself to self-tune. I still do not understand why UCC’s output 60/40 waveform, is this because I’m driving the circuit from the FG ? Will this change once I get feedback circuit working ? Ideally it should be 50% duty cycle, right ?
45
« on: February 04, 2019, 11:17:29 AM »
Worth mentioning that my coil would not run without the function generator connected to the antenna.
- I think you should get that working with a priority. Did it only work with the function generator before you swapped the gdt connections or after doing so? Or have you tried it? Swapping the connections should have made it work.
- And as far as I can remember you don't use a topload at the moment? That could be a problem for the feedback as well.
- Have you decreased the current draw? You said you wanted to, but did you also do it?
- When you have it running again, run it for a short period of time and feel if any component got warm. And film the sparks
It never worked on it’s own, always with the FG connected. Swapping the connections made it produce a better discharge, but with the FG only That is right, no top load yet, I have a metal sphere that I can use, about 120mm dia Well, as far as the current draw is concerned, It was going high, about 4A at 30V. Then, next time I tried it stayed at about 2.5A, I thought that it “sorted itself out”, so I decided to try doing a full test - aaand things fried. I just investigated the circuit and found that both Fets are gone, in addition to the smoking caps. As you suggested , I should have sorted out that duty cycle, currently it is about 60% ( which makes me think that is why Fets died ) UCC***22 is at 61% UCC***21 is at 39% I have no idea what controls their duty cycle or how to adjust it ! Might be obvious, but I’m not afraid to admit that I do not know. If I feed sine wave signal into the antenna, inverter outputs a nice square wave at 50% duty cycle, it is 50% at pin 2 of the UCC’s, but they change the duty cycle. Replacement parts should be here by Friday, so I get to try again I find all this rather interesting...
46
« on: February 04, 2019, 03:59:23 AM »
Waveform was exactly like that, but I did play around with the pots while the coil was running. As they say hindsight is always 20/20, cap I used is probably not suitable, it is Polypropylene but voltage is only about 300V AC. https://au.mouser.com/ProductDetail/Illinois-Capacitor-CDE/MPX684K305G?qs=HXFqYaX1Q2ycCo06bCS07Q==I ordered caps you suggested, they seem like a good choice, I also ordered a pair of Fets, just in case I blew one up. I did not check yet if I fried them or not. I can’t remember exact voltage at the time, but Variac was supplying about 70-80V. Worth mentioning that my coil would not run without the function generator connected to the antenna.
47
« on: February 03, 2019, 09:37:58 PM »
Well, unfortunately that did not go so well, I slowly increased the power, started getting longer sparks, and then C8 started smoking. It is rated over 400V, I do not understand why did it go up in smoke?
48
« on: February 03, 2019, 12:19:35 AM »
Dexter, Fumeaux, I just switched the primary winding on the GDT, there is better output now, when connected to my function generator, at about 340 kHz I can see small streamers on top of the secondary ( worth mentioning that I do not have a top load yet, but I have 150mm metal sphere that I intend to use ). Sparks will jump across 30mm gap to a piece of metal held close. At about 30V DC it draws about 2.5 A Slowly going in the right direction I suppose
49
« on: February 02, 2019, 11:12:46 AM »
Desdtime is the time between one mosfet turning off and the other on. As both fets are connected to the same gdt they both get the same drivesignal. As far as I am concerned, there is no deadtime, which makes the curcuit a bit less efficient, but thats not a problem. If you wanted to implement deadtimes, the driver would have to become quite complex.
And you can try to reverse your gdt connections. Then you should get an output.
I suspected exactly that, but wasn’t sure. In that case it would be easy to measure the “deadtime” on the scope, however in my case it wouldn’t be easy because waveform is so messy. When you say reverse the GDT connections, do you mean rotate the GDT 180 degrees ?
50
« on: February 02, 2019, 08:32:42 AM »
@Dexter, Seems like GDT is working fine, waveform on Fet gates is correct, so I think i got the GDT right this time. @Fumeaux, Function generator was not connected at all, that is probably why Q1 was heating more than Q2. I connected the generator today, and - NOTHING, absolutely no activity. Then, I decreased the frequency to about 200kHz, and the nearby fluorescent tube lit up along the entire length, current draw went up as well, but no sparks. Both Fets were equally warm. I’ll have to do some maths to work out the current draw as you suggested. @Teravolt, I would like to be able to answer your question, but I do not understand “dead time” I’ll google it and see if I can figure it out. This is my first SSTC, I’m OK with electronics, but nowhere near where I would like to be. I built SRSGTC - mechanical switching, mechanics I understand very well
51
« on: February 01, 2019, 11:10:49 AM »
Ok, I went back over the circut, and yes I swapped one of the GDT windings - the one that goes onto the gate of Q2. It is meant to be reversed, but I reversed it twice . I fixed that, now I got inverted signals on the gates ! Then I decided to connect it to my lab power supply instead of mains, and to my surprise nearby fluorescent tube STARTED LIGHTING UP !!!! YAY !! I increased the voltage to about 30V and managed to get a small zap from the secondary breakout point. I noticed that the current draw was about 2 Amps, and it was pulsing. Forgot all about the run time, had it on for about 5 min continuously, before realising that I might fry something. Mosfets got pretty hot Q1 more than Q2, fortunately I fitted a large heatsinks so they did not fry. What would be next step before I connect it to my Variac ?
52
« on: January 31, 2019, 10:07:55 PM »
Thank you for your comments. Fumeaux, I will try the light globe test as you suggested. The way I understand the GDT windings, first one is connected to UCC’s, second is connected to Mosfet 1 and third is connected to Mosfet 2 but it is swapped / twisted ( maybe I got this bit wrong ). Thinking about it, I probably got it wrong right there....
Teravolt, I noticed that the waveform changes as I move the ground leads around, so you are probably right about picking up noise.
53
« on: January 31, 2019, 11:40:32 AM »
Ok, I made a new GDT, using new cores and this time I used magnet wire. I scoped the gates of the Mosfets and I do not know what exactly is going on. Signal does not look clean at all I was expecting inverted signals, but they look the same.
I'm starting to think that there is something seriously wrong with my circuit....
54
« on: January 31, 2019, 12:28:02 AM »
Thanks Mads, my new cores just arrived, so soon I’ll be able to test my waveform with proper GDT ( I hope it will be good anyway ) They are blue - that’s a good sign, and all the way from Czech Republic to Australia
55
« on: January 25, 2019, 10:18:51 PM »
I am waiting for a proper toroid cores to arrive, Mads noticed that my current core is not suitable for frequencies needed. They should arrive next week. I do not have any 24 awg wire for the windings, I used slightly thinner wire in my current GDT, do I need to compensate for this ? Maybe I should use slightly thicker wire ? Im sure there is maths behind this My secondary is almost finished, last polyurethane layer is drying as we speak. For a primary coil, is it better to use solid core copper wire or multistrand is ok ? My SRSGTC uses 6mm copper conductor for primary windings, that seems to work well....
56
« on: January 25, 2019, 01:29:31 PM »
GDT is connected, but there was no feedback signal to the antenna. Do you think it will make a lot of difference ( feedback signal ) I will have a go at at that tomorrow...
57
« on: January 25, 2019, 11:40:25 AM »
As Fumeaux suggested, I took some measurements of voltages at different points. Just remember that I am still learning to use my new digital scope, apologies if something does not make sense. From what I see and understand there is a bad noise problem, comments are appreciated.
Image 1 - Output of LM7812 Image 2 - Output of LM7805 Image 3 - Voltage at 555 ( trace is a bit dim, I later realised that I can make it brighter ) Image 4 - Voltage at UCCXXX22 Image 5 - Voltage at UCCXXX21 Image 6 - Voltage at SCH Inverter
58
« on: January 24, 2019, 11:21:11 AM »
Hello, These components have been hanging around my workshop for a while. They look like something that could be used for a cool project but some of them are complete mistery. Image 1 - I thought these are large IGBT's but they are definitely not. Images 2 and 3 - Large capacitor bank of unknown rating Image 4 - another large cap Please let me know if any of these are worth keeping Yes, I know that the mouse can be used as a pointing device, it is there fir scale
59
« on: January 24, 2019, 08:16:50 AM »
For this coil I used Polyurethane varnish, I’m already on my 4th layer. Usually I use Ultimeg varnish - designed for the electrical industry to resist high voltages. I do not expect a huge output on this coil so I did not want to use expensive material. Secondary on my SRSG TC is done with Ultimeg and it works really well.
60
« on: January 24, 2019, 06:35:01 AM »
Drying Secondary is taking up space on my bench, so I can't work on the circuit until it completely dries...
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[Dual Resonant Solid State Tesla coils (DRSSTC)]
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sky-guided April 09, 2024, 02:46:46 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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OmGigaTron April 08, 2024, 09:32:57 PM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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OmGigaTron April 08, 2024, 09:25:11 PM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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alan sailer April 08, 2024, 08:45:15 PM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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OmGigaTron April 08, 2024, 08:24:13 PM
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Big Coil Big Sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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alan sailer April 08, 2024, 04:02:48 PM
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