Author Topic: Benjamin's DRSSTC3  (Read 504 times)

Offline Benjamin Lockhart

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Benjamin's DRSSTC3
« on: November 27, 2023, 09:07:43 AM »
Hi all,
After having problems with the driver dying in my large freewheeling coil, I decided that I wasn't happy with the overall design. It's too heavy and difficult to set up. So I just built a whole new coil.
The plywood base is 16.75 inches in diameter and the whole coil stands about 5 feet tall

It's based heavily on Loneoceans DRSSTC3, and just so happens to be my 3rd coil build.
The specs are;
   8x36 inch chicken wire and plywood toroid (it's a cheap way to build), with 3.25x14 inch smaller toroid below
   6.3x27.5 inch secondary with 28AWG wire

   8 turn primary of 1/4 inch tube with 3/16 inch between turns and 0.8 inch clearance from secondary, 0.162 coupling, compressed air cooled, but I may need to upgrade to water cooling, I was melting primary supports!

   365nF 15kV 260A rms MMC using dawncaps, it stays completely cold. Javatc says the primary surge impedance is about 7.5 ohms and I think that number has quite an effect on the behavior of spark growth. Also I think that the primary and secondary geometry is more important than the exact coupling, however you should still try to maximize coupling for a given geometry. Play around with the primary outer diameter in javatc, you will find that there is a sweet spot that gives the most coupling. The exact diameter depends on other parameters as well.

   UD2.7C

   800A OCD for now, primary current peaks around 1000A
   130uS on time
   CM300du-24nfh full bridge, 680V DC bus voltage
   Approx 60kHz operating frequency with 7% primary detuning.


   4x 3300uF, 450V bus capacitors in doubler for 3300uF total, not shown are 2uF snubber caps across each IGBT brick.


   Onboard bus precharge circuit consisting of a 12 ohm resistor that gets bypassed by a 50A relay powered by the 24V SMPS. The SMPS has a 1/4 second turn- on delay which is enough for the caps to almost fully charge before the relay closes.

Here are some build pictures.



I don't know why some pictures are sideways?

Here is a tin can almost melting at half voltage.
And it makes 7 foot sparks!



The sparks really are incredibly bright!
What do you all think?
« Last Edit: November 27, 2023, 10:05:18 PM by Benjamin Lockhart »

Offline davekni

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Re: Benjamin's DRSSTC3
« Reply #1 on: November 29, 2023, 06:32:03 AM »
Quote
What do you all think?
Looks like a very clean build with great performance!

Quote
Approx 60kHz operating frequency with 7% primary detuning.
Would have guessed you'd want a bit more than 7% for long arcs.  Arc length is already good.  Top load size helps with minimizing detuning, and coupling helps maintain performance in spite of secondary frequency drop.  That may be why 7% is sufficient.  Probably best for music.  Would be interesting to see if arc length could be any longer with a bit more detuning and a bit longer on time.  That's only if you want to risk pushing coil's limits.
David Knierim

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Re: Benjamin's DRSSTC3
« Reply #1 on: November 29, 2023, 06:32:03 AM »

 


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