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LAN_403

Crow187

Mon Jul 02 2007, 10:14AM

Registered Member #795 Joined: Mon May 21 2007, 06:04PM
Location: Bocholt, Germany
Posts: 35

Hi there, I'm new to this board, and I want to present what I am working on.

I had the possibility to use IGBT halfbrige-bricks rated 600A and 600V with 1200A pulsed. So I decided to build a big DRSSTC. I use 4 of these (2 in parallel) to bulid my fullbrige. So I have 2400A pulsed current rating of my bridge. I designed the control electronic by myself, and wounded a PVC pipe with a diameter of 40cm, total hight 1.75m with 0.75mm wire.

Perhaps a bit oversized, but I liked to build this big coil =)

The topload is just temporary like you can see on the pictures, I ordered aluflex, so soon it will be much nicer ;)

I have still to do a lot.... At the moment: Lacquer the sekcoil, peakcurrentdisplay, toroid and primarycoil have to be rebuild...

I get sparklengths to 1.70m, but the bridge is still keeping cool, and it can take much more, I will test that the next weeks.

Here a picture of the bridge:

IMG 4634thumb

And here a picture of the pipe:

IMG 4748thumb

And here two sparkpictures:
IMG 0125thumb

On my website are more detailed infos (only in german, sorry), pictures and videos:

I hope that i will get 3m long sparks soon ;)

If there are new infos of this project I will post here!

Lukas

p.s. sorry for my bad english

Sulaiman

Mon Jul 02 2007, 10:25AM

Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141

Welcome - That's quite a first post!

(much better than the usual first post of "Who can give me plans for an EMP bomb?"!)

Looking at the 'scope shot on your website;
It seems that the effective primary resistance is providing output current limit
(the envelope of the ring-up flattens-off)
So I guess you could use the IGBTs in a full-bridge if required.

Looks like some major ozone layer replenishment is due!

Great stuff !!! Keep us updated.

Crow187

Mon Jul 02 2007, 10:37AM

Registered Member #795 Joined: Mon May 21 2007, 06:04PM
Location: Bocholt, Germany
Posts: 35

Sorry, I wrote halfbridge, but i wanted to write fullbridge! These bricks are a halfbridge each, and i put 2 in parallel for each side of the fullbridge.. I corrected it in my first post.

You are right, the primary is (like a lot of things) just temporary, copper tube is ordered to build a nice one!

Lukas

Crow187

Fri Sept 07 2007, 01:26PM

Registered Member #795 Joined: Mon May 21 2007, 06:04PM
Location: Bocholt, Germany
Posts: 35

Hi there!

I just wanted to update my Projekt.

Sparks are now more than 2 meters long... The only limit is now the powersupply, the H-bridge can make much more...

Here are a few pictures.

crow187

Dalus

Sat Oct 06 2007, 04:29PM

Registered Member #639 Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512

That's some brute power you've got there. I never get it where some people get the money from to build such cool tesla coils. Could you share the schematic of the control electonics?

Crow187

Tue Nov 06 2007, 12:10PM

Registered Member #795 Joined: Mon May 21 2007, 06:04PM
Location: Bocholt, Germany
Posts: 35

Yes I can post the scematics if I can find them! =)

I will search and post if I find them...

In two days I will make another testrun on this coil and hope to get 2.5m sparks.

bye

Crow187

Fri Nov 16 2007, 12:40AM

Registered Member #795 Joined: Mon May 21 2007, 06:04PM
Location: Bocholt, Germany
Posts: 35

An update for my project! Today we tested some new things (like a new toroid again), and it was really successful.

A few hits into the ground were about 3.6m away from the outpreak-point! =) The fotos I post now don't show that long sparks, but I will post them tomorrow.

The upper picture is color-corrected with PhotoShop, and a 4s exposure.

Have fun with the pictures!

p.s.: We allways blew up the 32A 3-phase powerline when the coil was running at full power and hit the "target"!! fun ;) So these pictures are NOT at full power!

Lukas & team!!!

Crow187

Fri Nov 16 2007, 01:47PM

Registered Member #795 Joined: Mon May 21 2007, 06:04PM
Location: Bocholt, Germany
Posts: 35

Now here are some "ground-hit" pictures!

These are all about 3.20m or 3.30m distance from outbreakpoint.

The pictures at the bottom show what happens if a plant is hit ;)

Now I will rebuild my electronics (IGBT driver, and main electronics). After that I will eventually increse the voltage on the bridge.

Perhaps I will have 4 meters soon?!

Hope you like my coil, don't you?

Lukas

Dalus

Fri Nov 16 2007, 03:48PM

Registered Member #639 Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512

Now that's truly impressive. Those ground strikes almost look like a plasma torch. Hope you'll hit the 4 meter mark soon. Where did you get those igbt's from?

Crow187

Fri Nov 16 2007, 04:52PM

Registered Member #795 Joined: Mon May 21 2007, 06:04PM
Location: Bocholt, Germany
Posts: 35

I build this coil in our university, and the IGBTs were inventory of a laboratory. The university gets electronic components from a company wich the university cooperates with... When they are developing something and parts are not used, they give them away (most to us) after a period of time...

So it was just luck that we had IGBTs like that! =)

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