Author Topic: Drsstc 3  (Read 196 times)

Offline oneKone

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Drsstc 3
« on: March 26, 2018, 04:13:08 AM »
While my second drsstc is on hold i thought I'd start trying to design another drsstc. The two coils I'm thinking of are:

110mm diameter, 440mm winding length, 0.3mm wire, 1460 turns. As for the bridge I was thinking about a full bridge of 82N120. Eric Goodchild wrote that 82N120 can run at the same frequency as the ixgn60n60. I'm thinking of using the 82n120 so I can go up to 600v bus.

Or

160 diameter, 640mm winding length, 0.3mm wire, 2130 turns.
With a fullbridge of cm300du-24.

As for the driver I'm on the fence to go with a 1.3b or an 2.7c driver, especially because I have an unpopulated 2.7c board, or if there's a point when  phase shift should be added to a coil,  at what point it's necessary. I'm hoping someone could maybe provide some insight with these more larger coils.


« Last Edit: March 26, 2018, 04:15:47 AM by oneKone »

Offline Mads Barnkob

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Re: Drsstc 3
« Reply #1 on: March 26, 2018, 09:45:09 AM »
Be careful with multiprojectitis, it is a horrible syndrome and we are many that suffer from it ;)

I would advise you on building the larger CM300 coil, simply because it is a different beast of a inverter than the TO- package parts you have been using so far. It can take so much more abuse just from the shear size of the silicon die.

Both 1.3 and 2.x with phase lead will work great on your coil. Phase lead is used to minimize hard switching current when we are not hitting ZCS spot on, so as long as you can manage the extra temperature rise, there is nothing wrong with a little hard switching, but if you start pushing things to the limit and beyond it suddenly gets critical! If you run your CM300 at some 600-800A there should be no problems without phase lead, but if you want to push them above 1kA, you better well use it :)

You could always do the math according to the temperature calculations in my IGBT selection guide and see how much phase shift you can allow and still stay below 30 degree Celsius temperature rise per pulse (and be able to cool that off before next pulse).
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline oneKone

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Re: Drsstc 3
« Reply #2 on: March 26, 2018, 12:45:27 PM »
Mads...... You simply never fail to give good advice! I'll go with the cm300 config, as well as reading your guide. I figured since I have the spare time I might as well wind a coil. But I think to add my own flair I'll water cool the system, especially with aio kits being relatively cheap.

Offline oneKone

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Re: Drsstc 3
« Reply #3 on: April 16, 2018, 05:23:22 AM »
Ok....  After a bit of thinking I'm going to go with the 110mm diameter by 440mm long secondary. I think I'll be too space limited to do full power runs with a bigger coil. But the plan of cm300du fullbridge is still going to happen!

Offline Mads Barnkob

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Re: Drsstc 3
« Reply #4 on: April 17, 2018, 03:06:07 PM »
If you get too many ground strikes with a short secondary coil, you can always place the coil up on a table :)

It is only a problem if you end up with a coil that only makes topload to strike ring sparks, but with a good long break out point that is properly not an issue.
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline oneKone

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Re: Drsstc 3
« Reply #5 on: April 17, 2018, 03:31:42 PM »
literally the only thing i focused on " short secondary coil " (man my mind operates differently after gaming).

A large portion of my decision to change the secondary length was because i don't have enough wire, but i'm going to have to order more anyways to build a new pll sstc. So the big build is back on! realistically it's only about $130 price difference. Another thing that i'm thinking of changing is rather than going for cm300du-24 bricks i might go for the cm300du-12. part of me wants to try the Chinese bricks to see how far i can get, even though the sting of those ixgn60n60 still feels fresh! 

I think this build will take a while. with bigger ticket items it's going to put put more of a strain on my project/hobby budget.     

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Re: Drsstc 3
« Reply #5 on: April 17, 2018, 03:31:42 PM »

 


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