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1
Solid State Tesla Coils (SSTC) / 120VAC Mains Ramped Builds
« Last post by Magneticitist on Today at 03:00:04 AM »
Got a lot of useful information reading this website so for what it's worth here are some pics and a little info about a ramped build I thought worked out pretty good. ZakW posted a lot more info about a similar build which has gotten great results. I'll probably try to rebuild mine and jack it all up so here is the breakdown.

I saw good results from the Loneoceans RSSTC and one shown on SciTubeHD's youtube channel so I basically tried to wind some coils with similar dimensions and resonant frequency. I also tried some other staccato interrupters already out there but Gao's seemed to work the best for me. I've found it difficult to exceed 12 inch arcs on an SSTC without upping the coil size so the budget QCW mains ramped approach seems like a really good setup and who doesn't like sword sparks.

They are based on Steve Ward's SSTC 5 driver (https://www.stevehv.4hv.org/SSTC5/miniSSTCfnlsch.JPG) with a "staccato interrupter" in place of Steve's 555. I'm running FGA60N65SMD IGBT's on it and still using a 1:1 GDT but using a 15v regulator to power the gate drivers and this just makes things simpler.
Other changes are things like the DC blocking capacitor value at the driver outputs (which should probably be experimental, I think I have like a 2uF ceramic) and the addition of a 1uF DC blocking capacitor in series with the primary (a few .33uF 1200V MKP caps I had).
I had a fairly large T37 core so I used that to wind a single GDT for driving both halves of the bridge. It allowed me to fairly easily wind 5 twisted wires. I have a CT for the feedback with about 30 turns. To add PLL feedback I put a 5v driven CD4046 in between the hex inverter and the gate drivers.

Below are the two builds I've tried with the half bridge on the left and full bridge on the right. They are both using very similar coil dimensions of 36 AWG on 9cm tall by 8cm wide formers (and run about 400khz). A 32 AWG coil of slightly larger dimensions seemed to work well also. The one on the left has the staccato and logic transformer inside the box and the one on the right currently uses an external logic supply and gets the mains sync from a transformer inside my interrupter box. I plan to get a nice toroid for the full bridge and hopefully hit that 20 inches. They are both more or less identical builds but with one using the full bridge and PLL feedback.


This is is a big universal interrupter box I went ham with trying to put everything I could into it over time. The interrupter circuit is isolated from the RCA plug with an optocoupler and 9v battery which I found almost necessary without 'getting lucky' dodging interference. I did the mains sync like that because I figured I'd want to be able to run any other builds I make mains synced without having to make a new circuit each time. I'm using Gao Guangyan's circuit seen here https://www.loneoceans.com/labs/sstc3/schema_sstc3_staccato.jpg but with C4 modified for the full 60hz half wave (quieter thicker arcs due to adding and shutting off after the downward slope).


Bridge and driver board. I believe there is about 2uF worth of film caps across the bridge and I stacked what I had at the time.
There are 15v, 12v, and 5v regulators, the 12v just being for the fan. There is a janky heatsink I used which was just a couple alu plates from somewhere I put together so it has this fan on a 40C N.O. switch. At ~8ms and highest BPS it appears to pull around 5A from the wall with the current tuning. I noticed the arcs were decent enough without the PLL though.


Using the two UCC2732x gate drivers which seem to run the full bridge ok in this operation but it's possible at ~8ms on times at highest BPS they will start overheating eventually. If I run it hard for a while to the point I can feel the heatsink getting more than just warm (with fan blowing) then the output seems to drop a little probably indicating the drivers and switches don't like it. Nothing gets too warm at the lower break rates it typically runs so it all kind of works out. I get them from mouser and Ebay/Amazon or something like that will always give you fake ones so don't do it.


A pretty basic layout that hasn't punished me for it but hey I'm not recommending a slack build or anything. This is the 2nd time I made a full bridge "test layout" like that I ended up just keeping in a final build, the other being a DRSSTC which uses the same kind of bridge layout, but to be fair might be getting saved by the snubber. I usually test with an isolated DC supply first, then low voltage AC, then full mains. So far with various coil testing these IGBT's have held up so they are pretty trusty.


A few shots of some ~18 inch arcs. I have a piece of foil above set to 20 inches from the breakout point which I could not get it to strike no matter how clever my insults were. When I had it set to 18 inches it would strike it every now and then but who knows what slight variations could result given environmental changes etc. I was originally struggling to get it to hit 16 inches before just messing with the primary a little bit and randomly testing various phase angle adjustments.




Here's a 16 inch strike from the half bridge catching mainly the tail end of the arc. I was pretty liberal with the size of the boards so in reality the spark to coil ratio could look much better after condensing the box down and everything looks smaller. I tuned that half bridge, got it to strike 16in, then was too excited about it to mess with it any further lol.


When it comes to the longest arcs from such a build it seems like it becomes a battle of finding a running frequency which is not too high or low, as well as trying to get it to form arc channels which don't branch on their way out as actual swords. That is to say I've seen tuning which seemed better in phase and probably had more power in the arcs but due to a tendency to branch more, a different tuning which pulled less power might yield longer discharges. I've kept fairly high coupling with these something around normal SSTC range and tried to keep the primary just out of streaking. There seems to be a certain science to 'encouraging' discharges to form just right as that voltage in the secondary starts to skyrocket. Slight changes in the breakout point length can for example make a big difference. A stuttering output with popping and clicking may indicate this energy trying to go somewhere and ending up in primary discharges you might not see in the light, where it may otherwise find its way out a longer breakout point, or one which is oriented to the side for example. I think using mosfets and an even smaller coil maybe closer to 600khz could get either the same arcs or longer. That's about all the insight I can personally offer into it so if you made it this far reading thank you for your sacrifice.
2
Detection, Counting and Measurements / Re: Muon Decay
« Last post by alan sailer on Today at 02:16:57 AM »
Michael,

The light paths inside a slab must be crazy. The surfaces of the slab would cause all sorts of internal reflaections and escapes. The white paper is not well coupled to the slab either. When I was trying to think of a good way to cover the slab I wondered if just painting it white with latex house paint would be a good idea. The trouble of trying to remove it (if just soaking in water didn't work) and having to polish such a lrage surface kept me from trying the experiment. If I do end cutting it up (quite likely) it might be fun to try the white paint on a smaller chunk.

The multiple PMTs is a fun idea. Do enough and with a proper computer could you do a single tomography slice and draw a reconstruction of the event? I know enough to ask the question but not enough to answer it. Story of my life...

Cheers.

Cheers.
3
Hey guys!
I modified a few more things on the coil and had some issues.
I also finished the toroid!



IGBTs have finally arrived. I replaced the IRFP460s and put the FGA60N65SMDs in place.
In the first test I didn't use the voltage doubler, so it was 170vdc on the IGBTs.

The first thing I noticed was the different sound of the sparks, the second thing was the sparks between the primary and secondary (which did not happen when using the IRFP460s with the same voltage).
I lowered the height of the primary to reduce the coupling and the sparks stopped happening (However, when I brought my hand closer to the output, sometimes sparks would happen between the primary and secondary).

I did a few more tests and played with the coil for a few minutes, no problems.
So I decided to use the maximum power, 340vdc. I turned on the voltage doubler and for a few seconds everything was amazing. The coil worked wonderfully, the sparks were huge!
The duty cycle potentiometer was at approximately 60%. When I increased it to 100% the coil ran for a few seconds and something went wrong.
The on/off switch seemed to have sparks inside. The coil has stopped working. I immediately turned off the switch.
I did a quick inspection and nothing seemed to have any burn marks despite a little smoke and a smell of burning electronics (I figured this must be a problem with my on/off switch).
Again I turned the switch on for a second or two and I could see a light like an arc forming inside the plastic of the switch cover.

The third time I flipped the switch to try to identify the cause, my house breaker tripped and my extension cord melted completely!


I would like to understand a few things:
Why after putting the IGBTs I had problems with racing sparks even when using the same voltage as when using the IRFP460s?

Inspecting the coil, it appears that the problem is in the rectifier bridge, as the smell of burnt electronics is coming from it. If the problem is really there, could this have damaged my IGBTs or some other component on the board?

And what could have caused this problem?

The bridge model is:
KBPC-3510
Reverse Voltage: 1000V
Direct current: 35A

Congratulations on having a good looking and working Tesla Coil! You did a great job on making all those parts from scratch. Happy new year!
Thank you so much!

This Labcoatz SSTC 2.0 circuit has problems when used with current transformer feedback.  Yes, it may function some, but it could also be your issue here.  I'd fix this before exploring anything else.  See this post for examples:
https://highvoltageforum.net/index.php?topic=1888.msg14153#msg14153
After switching to IGBTs, during tests with 170vdc I didn't notice the sparks getting weak when approaching things to the output, however I couldn't do many other tests because I had other problems.

Awesome 3D printed case and overall beautiful coil! I plan on printing a case for my coil as well, its nice to see your design.
I like the adjustable primary height. Does it normally move freely but can be held in place using zip ties?
The zip tie is just for leveling the primary. But I already have plans to print a new primary model with tabs so I don't have any more leveling problems.

4
Detection, Counting and Measurements / Re: Muon Decay
« Last post by Da_Stier on January 20, 2022, 05:19:26 PM »
Da_Steir,

Anything I'd say about the different amplitudes would be speculation but theoretically with such a large block particle that decay further away from the PMT would have smaller amplitudes.


That's a pretty good point, with such a large slab, the distance to the PMt is definately not negligible, I totally did not think about that.




A piece of data that initially confused me was the event that occurred before the triggered pulse. If you look at the final infinite persistance image you can see this. I believe that there is no rule that the initial muon detection has to be brighter than the decay pulse. The geometry of the slab should allow a far away (and dim) initial pulse and a brighter (closer) decay event. The trigger would pick up the decay and thus the initial entry pulse would appear before.


For this it might be pretty interesting to have several PMTs around the slab.
I guess like that you would be able to triangulate the exact location of the event and therefore calibrate out the "light transmission losses" through the slab.
If you push this to the extrem, a spherical scintillator with a grid of PMTs might give the best results, since it has the least sharp edges and the smallest distances to every PMT.



I'll keep you in mind for chunks.. I have another experiment to try and then I am done with the slab. A little warning, the dealer said that he was unsure if it was Bicron 412  or 408. It does detect muons and gets more frisky when I bring a piece of U ore near it, so it does do gammas.


Thanks a lot. The exact type wouldn't matter for me, since I would also just play around a bit without the need of trustworthy output data.  :)



Greetings,
Michael
5
Detection, Counting and Measurements / Re: Muon Decay
« Last post by alan sailer on January 20, 2022, 03:53:54 PM »
Da_Steir,

Anything I'd say about the different amplitudes would be speculation but theoretically with such a large block particle that decay further away from the PMT would have smaller amplitudes.

A piece of data that initially confused me was the event that occurred before the triggered pulse. If you look at the final infinite persistance image you can see this. I believe that there is no rule that the initial muon detection has to be brighter than the decay pulse. The geometry of the slab should allow a far away (and dim) initial pulse and a brighter (closer) decay event. The trigger would pick up the decay and thus the initial entry pulse would appear before.

I'll keep you in mind for chunks.. I have another experiment to try and then I am done with the slab. A little warning, the dealer said that he was unsure if it was Bicron 412  or 408. It does detect muons and gets more frisky when I bring a piece of U ore near it, so it does do gammas.

Cheers.

6
Detection, Counting and Measurements / Re: Muon Decay
« Last post by Uspring on January 20, 2022, 01:20:19 PM »
Lovely experiment  :)
Big scintillators increase the probability of stopping muons within the scintillator. Most muons have a high energy and will zip right through the block and decay far underground, where you won't see the decay. You will see the traversal, though, and depending on the energy and the length of path within the scintillator, there will be more or less light generated. For accurate statistics it is helpful to not have too many background (e.g. traversal) events.
7
Detection, Counting and Measurements / Re: Muon Decay
« Last post by Da_Stier on January 20, 2022, 10:11:21 AM »
Hi Alan,

very nice.
Even if an experiment isn't new or original it always is very interesting to see what details, problems and interesting things you face when actually doing it.
I like the big scintillator block, it provides a nice surface area.

I guess your infinite persistance scope screenshot shows different particles being captured, since the peaks have different amplitude?

If you decide to cut up the slab and sell it, I would definately be interested in getting a piece or two.  :)

Greetings,
Michael
8
Detection, Counting and Measurements / Re: Muon Decay
« Last post by alan sailer on January 19, 2022, 08:22:49 PM »
Mads,

Thanks for the suggestion. I have seen muon telescopes based on paired detectors.

The use of microcontrollers and computers is usually enough to turn me away from a project.
Programming has always either bored or frustrated me. It's like work but without the paycheck.

Cheers.
9
Detection, Counting and Measurements / Re: Muon Decay
« Last post by Mads Barnkob on January 19, 2022, 06:49:36 PM »
No need to delete a great thread. Some times the small experiments are more vital to understanding our world than the large experiments!

You could chop up the scintillator and build a muon coincidence detector, there is even some open source software/microcontrollers for that. I was just googling around a bit and found this: https://muonpi.org/ a RaspberryPi based muon network online! I might even join up my not-used-pi and my PMT for that :)

10
Printed Circuit Board / Re: Etching PCBs with a SLA 3d printer
« Last post by hardboiled99 on January 19, 2022, 07:37:27 AM »

The chitubox file format is quite simple and only packs the image data with run length compression, and there was another java project that decoded and encoded the format already out there, so I quickly threw together a piece of software that converts the gerbers directly to the printer's format


I recently saw a couple of Youtube videos on this (etching PCBs using SLA printer), and wanted to try it out myself. Having some file conversion challenges, and was wondering if you ever pursued this further?

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[Solid State Tesla Coils (SSTC)]
SK1701
January 05, 2022, 08:37:13 PM
post Re: Bus Supply Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Hydron
January 04, 2022, 05:58:10 PM
post Re: Bus Supply Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
AstRii
January 04, 2022, 01:37:02 PM
post Bus Supply Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
January 04, 2022, 04:12:34 AM
post Re: ZVS Driven Teslacoil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Andrew321
January 04, 2022, 01:14:26 AM
post WTS: small secondary coils
[Sell / Buy / Trade]
dbach
January 03, 2022, 05:38:08 PM
post Re: 60hz synchronous motor on 50hz?
[Spark Gap Tesla Coils (SGTC)]
klugesmith
January 02, 2022, 01:17:37 AM
post Re: 60hz synchronous motor on 50hz?
[Spark Gap Tesla Coils (SGTC)]
paulj
January 01, 2022, 06:53:46 PM
post Re: Single mosfet bifiliar gdt
[Solid State Tesla Coils (SSTC)]
MHV
January 01, 2022, 06:39:05 PM
post DC powered coil. best topology?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rafft
January 01, 2022, 02:05:43 PM
post Re: Full Bridge SSTC
[Solid State Tesla Coils (SSTC)]
Rafft
January 01, 2022, 11:54:25 AM
post Re: 60hz synchronous motor on 50hz?
[Spark Gap Tesla Coils (SGTC)]
klugesmith
December 31, 2021, 09:50:59 PM

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