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Topics - nabzim

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1
**cross-post from the Facebook group 'TESLA COILS are BOSS' ...
Working on my first DRSSTC, voltage-doubler half bridge, CM200 coil, very, very similar to Gao Guangyan's DRSSTC-2 (shoutout Loneoceans Ggy). Planning on a bus voltage of about 396 VDC (from 140V variac). I might also try using my 208/240V transformer to step up the input from 140VAC to 161VAC, which would give me a bus voltage of about 457 VDC...

Currently test-fitting components of the bridge, and I have a few questions:

Q1.
I am wondering if my DC bus bars might be too close together.
The closest point measures 0.18" or 4.6mm between the positive and negative DC bus bars.
Should I shave them down a little to increase the gap?

Q2.
In Guangyan's design, a 10k-Ohm resistor is connected across the tank circuit (bridge output), to drain remaining MMC charge before the next pulse.
He used a nice ceramic wirewound resistor. I have a cheap wirewound resistor with an aluminum heatsink.
I was planning on mounting it straight to the IGBT heatsink, so it would be RF-grounded. However, I am concerned that this may be dangerous, as the resistor leads are only 0.18" from the edge of the resistor's heatsink (coincidentally the same distance between the bus bars).
Is this a real danger to have the primary/mmc leads so close to RF-ground?
I could easily insulate it with plastic cutting-board and nylon screws to leave the heatsink floating.

Q3.
Considering the "general wiring scheme" put forth by Steve Ward, which is now a standard. I had been aware that the negative DC Bus rail is coupled to RF ground through a 100nF cap, so when I ordered my MMC caps (942c20p15k), I included one extra to use for this purpose, but I now realize that .15uF might be a problem, since it's not the specified .1uF standard.
My other problem... I had not noticed that Steve's "general wiring scheme, as well as Mad's "DRSSTC GROUNDING" schematic (shoutout Mads Lundbæk Barnkob), both show a second 100nF cap placed across the DC Bus terminals. This part, I have yet to acquire.
What purpose does this cap serve? (Wouldn't the IGBT snubber already fulfill this duty?)
Does it need to match the value of the RF-ground-coupling capacitor?
Can someone please recommend good caps to use here, cheaper than Cornell Dubilier? (I'd like to save my extra MMC cap as a replacement part.)

Thank you all!

2
1. For primary & MMC connection to the bridge output terminals, From "C2E1" to Bus Cap center-tap, should primary come come first, or should MMC come first, or does it not matter at all? Both from a practical viewpoint, and an analytical viewpoint, if possible please. I know it seems like it shouldn't matter because they're in series, but... y'never know, y'know?...  I always end up learning new things that I didn't know before!  ;)

2. For the Mains connection to the DC Bus-Cap Center-Tap, Should I connect the Neutral, or Hot?

3. I will save further questions questions for a later time, after I feel satisfied about the first two.
Mostly, because I'm tired and need to study tomorrow. Got my first Circuits exam on Thursday!

3
OK. So we are all familiar with the standard method of primary-strike protection, that is, connecting the RF-ground to the negative DC Bus via capacitive-coupling...
I have come to the realization, that this does NOT make sense.

If a streamer strikes your primary coil, the streamer-current must travel through one/both of your low-side IGBT's (full bridge), or through your low-side IGBT and/or Bus Capacitor (half bridge) to get from the Primary coil to the -Vbus rail.

Why is it not instead the standard to capacitively-couple the RF-ground directly to the Primary Coil? (a.k.a. the center-point, between high-side and low-side IGBT's)
This would keep the high-energy current from traveling through the semiconductor.

Are my assumptions here correct? If there is any logical reasoning behind the standard grounding-scheme (other than copying Steve Ward), then can someone please educate me? ???

4
Dual Resonant Solid State Tesla coils (DRSSTC) / UD 2.5 Schematic?
« on: February 05, 2019, 06:06:05 PM »
Hi everyone,

I have a UD 2.5 which I'm using to build my first DRSSTC. The problem is, nowhere can I find a schematic for this damn driver...

On Goodchild's website, the schematic download link doesn't work.  http://www.goodchildengineering.com/tech-design-blog/ud2-5

The links/files that people posted in the 4hv thread, are missing and/or non-existent. https://4hv.org/e107_plugins/forum/forum_viewtopic.php?p=14&id=152849

I am hoping that someone may have saved it long ago, back when the links (probably) worked.

Any help and/or related files would be greatly appreciated.
Thank you!
-Adam

5
Hi
So I'm currently designing my first DRSSTC. I'm aiming for similar specifications to loneoceans' DRSSTC-2 (http://www.loneoceans.com/labs/drsstc2/). I have been referencing his page as much as I can, however it's quite difficult without a schematic. Looking at other schematics everywhere I can find, still, there is nothing that gives all the answers to things I don't understand.

1. First thing that's bugging me, is that most sources recommend using TVS diodes across the Collector and Emitter of each IGBT, but from his pictures, it looks like Gao chose not to include them in his bridge design. Is it just not important for for half-bridge modules? I know there are already diodes inside, so...
2. Second thing, Does the voltage rating of the Snubber capacitor need to be so high? Gao is using 2000V 1uF, but that is somewhat hard to find at a good price... but 1200V is easy to find and more affordable... Though the price differences are not that big, I'm just trying to save a few bucks where ever I can.
*(3.) additional question at bottom of my post.

That's pretty much it for now... just want to be certain about the items in my Digikey shopping-cart before I checkout  ;D

In the shopping cart:
Fiber TX/RX and cable, epcos "T38 material" ferrite cores (for fb & ocd), heatsink, 1.5KE33CA for gates

I already own:
UD-2.5, (1x)CM200DU-24H, (10x)942C20P15K-F (9 for MMC, 1 for pri. strike protection),
Magnetics 0J43813TC (J material) for GDT, ...(can't think of everything right now)...

Planning to purchase in near future (or, add to shopping cart):
cheap 24v SMPS, ..... , other things, ....

I plan to finalize the major component choices/purchases and have a clear-cut design plan, before I attempt to build anything.
The build will go like this:
Build/install all circuitry in base/enclosure --> Build/install Secondary & toroid --> Build/install Primary
(I want to have the secondary installed first so that I can measure it's Fres at the correct height)

Gao designed his secondary with 34awg on a 3.5" form, 13" length, giving a Fres of 122 kHz. I have found through JavaTC simulation, that if I wind 32awg on a 4.5" form, with the same length of 13", gives me nearly the same Fres, about 122.7 kHz. So as far as I can tell, this will be a much better choice, for peace of mind, not requiring the dreadfully-thin 34awg.
*(3.) Gao's secondary frequency drops to about 106 kHz under spark load, and tuned his primary to account for such; with my proposed secondary, can I expect the same % F drop?

Thank you very, very much.

6
Electronic Circuits / Variable Frequency Drive?
« on: July 15, 2017, 09:11:09 PM »
Hi all,
After building a half-bridge sstc (and after reading a little bit about VFDs), I feel like I could potentially build the same circuit (half bridge) with a few modifications, to use as a VFD to power AC induction-motors with full speed control.

Any feedback/suggestions of what modifications the circuit would need? ( I'm fairly certain that I don't need to run off of a feedback-loop like the sstc)

7
Solid State Tesla Coils (SSTC) / Help with secondary-feedback?
« on: June 27, 2017, 08:03:57 PM »
I made a post last night about my SSTC, but I realized I may as well ask for help with this issue I had. I have been only successful with with antenna feedback, and while it works great, it would be nice to not need a giant antenna sticking up and out of the base, always needing to be re-bent into a good position if it gets shifted while moving around and whatnot.
I attempted to use this current transformer that I wound: https://goo.gl/photos/3Z2faavbYM8r9SvL9
It has 54 turns of 24awg and the core is this one: http://www.ebay.com/itm/Toroid-Core-Magnetics-ZW-42507-TC-Power-Ferrite-1-00-OD-2-PCS-AL-7825/261788162368?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

So, basically it works but only at low voltage. When I turn it up, it cuts-out past a certain point on my variac. I had been trying to use loneocean's sstc2 as the reference point to set up secondary feedback, so my feedback circuit is set up like his (except I do not have .1nF cap between the UCC input and ground). http://www.loneoceans.com/labs/sstc2/sstc2schematicv10.jpg
 I also tried a 1k burden resistor across the transformer's leads, after reading about current transformers, although that seems to be used for measuring current with a multimeter.

So I'm looking for some idea as to what I may be doing wrong or what I should try next... maybe different burden resistors, more turns of wire, or that the .1nF cap is more important than I assumed?

8
Mads' told me to post this here, after I had shown him my video:
Well I finally had some time to make a post about it! (I also had since then, a crap-ton of views on the video)
So I tried building steve ward's sstc a while ago, and it took me a long time to get it to work; i had never realized that I needed to ground all the unused inputs on the 74hc14, and that caused the feedback loop to never work and I only got the output of the 555 to be switching the bridge, so never more than a half-inch of spark. But After i fixed that I have gotten a max of 13-14 inch sparks with extra top-load and fat pulse-widths.
I had really wanted some form of musical-manipulation over my tesla coil, so I decided to try Mads' design, afterall, it did seem from his videos to work pretty damn well ;) And then I thought, I may as well go all-out and try to learn PCB-etching at the same time!
Here I have an album with pictures and videos of building and experimentation: https://goo.gl/photos/y9NqKmgMKqsAPUsx5
Its ordered chronologically, and there are pics of my first GDT attempts (before I figured out that wasn't the problem) before I actually bought one. I tried to scavenge for some parts and ended up buying most components, but the best recycled-part are the MOSFETS which came out of a big flat-screen TV that had been used by some folks as a shooting target around the outskirts of Calico ghost town. Luckily, there were quite a few mosfets that didn't have bullet-holes through them! And they have higher voltage and current ratings than irfp260's!

Anyways I also have here an album that shows some of my steps to making the audio-interrupter, my first PCB: https://goo.gl/photos/2BLhveGQihzkcd4f6
You can see I used a method that I made-up, that I call the "glue it to a stick" method. I thought of this as an answer to getting it done quickly and evenly, after seeing several different methods on youtube, and I didnt want to just let it sit for a long time, or have a setup that blows air bubbles through the solution, or wear gloves to rub it against a sponge by hand, so basically I can have a constantly mixing solution as well as not getting my hands all acidy and still being able to rub it on a sponge. I guess it would only work for single-sided PCB this way though...
So, I knew the audio input was able to be just regular audio, not some special-magical MIDI, so what not better to try, than my guitar as the input. Turns out it does work great!
Thanks Mads!
Just wanted to share with everyone on the forum, and let me know what you think or if you have questions :)

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