Author Topic: SKM150 DRSSTC III  (Read 994 times)

Offline Mathieu thm

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SKM150 DRSSTC III
« on: February 29, 2024, 09:50:55 PM »
Hi

I just finished my DRSSTC III and I wanted to share it with you.
All electronics fit in a small 29x29x17cm box.

Specs :
  • secondary : 125mm x 410mm (125kHz)
  • Toroid : 480mm x 125mm
  • primary :  6.35mm dia. copper tube
  • MMC : 5s15p of 0.039nF 2Kv (R75UN239050H3J)
  • IGBTs: 2x SKM150GB128D
  • Bus cap : 350v 6800µF
  • Driver : UD2.7
  • OCD : 400A

Photos of the build : https://photos.app.goo.gl/C4tJ3HKW8YK31F247



I set the OCD at 375A and the results are quite good, approximately 1 meter of arc at 150Vac and 120µs :

/>
The OCD did not trigger, I still have to test it with more voltage, I think set the OCD at 400A.

I haven't seen any DRSSTC with SKM150s, has anyone ever done a DRSSTC with SKM150s ?
« Last Edit: March 30, 2024, 10:57:16 PM by Mathieu thm »

Offline flyingperson23

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Re: SKM150 DRSSTC III
« Reply #1 on: March 01, 2024, 01:20:51 AM »
I think generally when people have decided to use 150A IGBTs, BSM150 or CM150 is cheaper. Kaizer's drsstc 4 used skm145, but I'm not aware of any others.

Offline markus

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Re: SKM150 DRSSTC III
« Reply #2 on: March 02, 2024, 05:23:06 PM »
Wow, really nice coil and such a clean build! Everything looks well planned, I assume you used CAD to model your setup in advance?

Offline Mathieu thm

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Re: SKM150 DRSSTC III
« Reply #3 on: March 02, 2024, 06:44:28 PM »
Thanks ! Yes, I used SolidWorks, very useful for making a clean build without too much difficulty during assembly.
« Last Edit: March 02, 2024, 06:57:38 PM by Mathieu thm »

Offline Mads Barnkob

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Re: SKM150 DRSSTC III
« Reply #4 on: March 03, 2024, 07:45:29 PM »
That is a beautiful little coil! The large table top version, which is a size that very few build. I think this is why about the SKM150 modules, it falls in between the realms of small coils that can run on TO-247 devices and the somewhat larger floor models on wheels that goes up into 200-300A range IGBT bricks.

Your 3D printer has also been on a lot of work for this one, so does that work easily from SolidWorks and pick a part directly to 3D printer?

There is one concern, which might not be a problem at 375A OCD setting. Your MMC is NOT designed for heat dissipation. It is more designed for destruction and meltdown of the middle.

You should have space between each individual capacitor, in both directions. Best way to achieve a MMC that can be cooled is to use small cuts of copper or brass plate/band to solder them together with. Film capacitors get rid of their heat from 2/3 through the leads and 1/3 through the package. The small copper/brass plates will work as heat sinks and with space between all caps, forced air cooling can flow between them.

Tried  to visualize that suggested small plates, add distance between the caps in your head, paint.exe was not good enough to illustrate that ;)

Red circle is where a capacitor will fail first, due to over heating. It cannot radiate heat from the side and leads are almost gone and only connects to another warm capacitor.

 
« Last Edit: March 03, 2024, 07:47:30 PM by Mads Barnkob »
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Offline Mathieu thm

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Re: SKM150 DRSSTC III
« Reply #5 on: March 04, 2024, 12:24:04 AM »
Quote
That is a beautiful little coil! The large table top version, which is a size that very few build. I think this is why about the SKM150 modules, it falls in between the realms of small coils that can run on TO-247 devices and the somewhat larger floor models on wheels that goes up into 200-300A range IGBT bricks.

Thanks !

Quote
Your 3D printer has also been on a lot of work for this one, so does that work easily from SolidWorks and pick a part directly to 3D printer?

You can't print directly from SolidWork, you have to export in STL format and use Cura.

Quote
There is one concern, which might not be a problem at 375A OCD setting. Your MMC is NOT designed for heat dissipation. It is more designed for destruction and meltdown of the middle.

You should have space between each individual capacitor, in both directions. Best way to achieve a MMC that can be cooled is to use small cuts of copper or brass plate/band to solder them together with. Film capacitors get rid of their heat from 2/3 through the leads and 1/3 through the package. The small copper/brass plates will work as heat sinks and with space between all caps, forced air cooling can flow between them.

Tried  to visualize that suggested small plates, add distance between the caps in your head, paint.exe was not good enough to illustrate that ;)

Red circle is where a capacitor will fail first, due to over heating. It cannot radiate heat from the side and leads are almost gone and only connects to another warm capacitor.

Yes of course I know that my MMC is not designed in the best way !
I'm planning to make a kind of "duct" just before the air outlet grille which is just in front of the MMC, so that all the air will pass through the MMC before going out.
I like the idea of copper strips, I've got some 0.75mm copper lying around, I think it'll do the trick.

We agree there's no problem connecting capacitors like this ?


So that I can lay a copper strip along the whole length more easily.

Offline Mathieu thm

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Re: SKM150 DRSSTC III
« Reply #6 on: March 04, 2024, 10:00:45 PM »
For now, I've done this so that there's a constant flow of air around the MMC :



I'll have to think about how I can place copper cuts on the caps connection

Offline Mathieu thm

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Re: SKM150 DRSSTC III
« Reply #7 on: March 30, 2024, 12:01:44 PM »
I set the OCD to 400A and did tests at 110µs ontime and 210Vac.
I lowered the primary frequency, I now have 1.2m to 1.3m arc maximum.
I think these are beautiful results and everything remains cold.






 
/>

« Last Edit: March 30, 2024, 01:15:58 PM by Mathieu thm »

Offline Benjamin Lockhart

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Re: SKM150 DRSSTC III
« Reply #8 on: March 30, 2024, 11:12:01 PM »
Very nice! I'm also working on a similar size coil with a single CM300 half bridge, 0.19uF MMC, and smaller secondary.

Offline Mathieu thm

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Re: SKM150 DRSSTC III
« Reply #9 on: March 30, 2024, 11:29:19 PM »
Thanks !
Can't wait to see the finished build if you make a thread !

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Re: SKM150 DRSSTC III
« Reply #9 on: March 30, 2024, 11:29:19 PM »

 


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