Author Topic: General Questions  (Read 640 times)

Offline flyingperson23

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General Questions
« on: January 06, 2022, 04:42:25 AM »
Obligatory am noob.

I'm building my first drsstc, so far with 680v bus, and I've just ordered 2 4700uF voltage doubler/bus caps and 4 cm300ha-24h's for a full bridge.

I've read that the higher powered cm bricks need beefy GDTs, but I'm not sure exactly what that means. Is it just that the gate sucks a lot of current?

I salvaged these (pictured) from a plasma cutter, where, and I could be completely wrong, but I think they were used for gate drive there. Are they useful for a drsstc?

Also from the plasma cutter, I got 2 25A S25VB100 rectifiers; will they be sufficient?

Finally, would it be preferred to make a new topic for each question I have or post replies to a topic I've previously made?

Thanks!


Offline AstRii

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Re: General Questions
« Reply #1 on: January 06, 2022, 08:17:09 AM »
Using salvaged cores for a GDT is always a bit dodgy as you don't know properties of the cores. Though you can always just try to wind it and see how will those waveforms look like and according to the waveforms you can try different windings count until you hit the sweet-spot. This may or may not work, some cores are totally useless for GDT purposes even ferrite ones.
Beefy GDT means that the GDT has to transfer a lot of current without saturating. This usually means big cross section of the core. When designing a GDT I always make sure that the magnetic flux will reach maximum of 100mT.

Also from the plasma cutter, I got 2 25A S25VB100 rectifiers; will they be sufficient?

That depends. You cannot easily predict how much power will your DRSSTC consume without knowing what duty cycles and OCD values will it run. CM300 coils usually run in the 5kW-10kW range which means a current flow of up to 40A (assuming 240VAC input). This means that you probably need to put both of them in parallel.

EDIT: Also as I'm looking at those cores you sent on the picture, to my eyes they look more like iron powder cores, those would be impossible to use as GDTs in DRSSTCs.
« Last Edit: January 06, 2022, 08:20:58 AM by AstRii »
Marek Novotny
Czech Republic, Czech Technical University in Prague
www.uhvlab.org

Offline Mads Barnkob

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Re: General Questions
« Reply #2 on: January 06, 2022, 09:33:06 PM »
Welcome to HVF :)

Have you looked at/read the DRSSTC design guide? https://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/

For GDT calculations, I got some notes under my Kaizer DRSSTC 1 article: https://kaizerpowerelectronics.dk/tesla-coils/kaizer-drsstc-i/ so you can get an estimate of the needed core sizes. To get the gate drive current needed, I have a calculator: https://kaizerpowerelectronics.dk/calculators/igbt-gate-drive-calculator/

A full-bridge of CM300 can easily pull some 10-15 kW from the wall, so a couple of 25A rectifiers in parallel will be just on the brink of 3 phase 400VAC 25A, ~15kW, so if you are only using single phase or lower voltages, they are not big enough.

The inductors you show looks like input filter or output chokes, they are not suitable for GDTs.

As long as you have general DRSSTC questions, you could continue in this thread. You could also make a "project" thread for your coil build where you show your build process and also ask questions and discuss solutions on the way. Some times if a topic is very specific and could be a de-railing of your original thread, its better to make new ones :)

Looking forward to see you coil throw lightning!

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Offline flyingperson23

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Re: General Questions
« Reply #3 on: January 08, 2022, 06:36:28 PM »
I just got my cm300ha-24h bricks in the mail. Should I remove the rtcs? If so, how? I found loneoceans guide, but I have slightly different bricks.

Thanks again, y'all are amazing!

Offline thedoc298

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Re: General Questions
« Reply #4 on: January 13, 2022, 03:10:32 AM »
I just got my cm300ha-24h bricks in the mail. Should I remove the rtcs? If so, how? I found loneoceans guide, but I have slightly different bricks.

Thanks again, y'all are amazing!

I don't have the information, but I would get the coil going first and then at a later time do the mod. Save a headache or two.

Offline Mads Barnkob

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Re: General Questions
« Reply #5 on: January 17, 2022, 07:41:34 PM »
I just got my cm300ha-24h bricks in the mail. Should I remove the rtcs? If so, how? I found loneoceans guide, but I have slightly different bricks.

Thanks again, y'all are amazing!

Wait for it to be a problem and make your bridge easy to take apart for service!

I made a guide on how to do it on CM600s: https://kaizerpowerelectronics.dk/teslacoils/cm600du-24fa-igbt-removal-of-rtc-over-current-protection/ and a video about it:
/>
Judging from the spark output alone, there was not much difference, I dont think I have any measurements saved anywhere...
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Re: General Questions
« Reply #5 on: January 17, 2022, 07:41:34 PM »

 


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