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Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
That's looking good. Would you be willing to give some more details about your coil, dimensions etc. I think a lot of the users on this forum could learn from your coil and circuits. You're one of the few people that don't copy others designs directly :)
Hope to see some very long sparks from your coil, good luck with the build.
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Dalus wrote ...
That's looking good. Would you be willing to give some more details about your coil, dimensions etc. I think a lot of the users on this forum could learn from your coil and circuits. You're one of the few people that don't copy others designs directly :)
Hope to see some very long sparks from your coil, good luck with the build.
If I can not think it myself, just then i copy other circuit, everything else i think myself... Now i just thinking about bridge (Interrupter, GBT driver, power electronics, , IGBT protection , MMC, etc) i don't know how large secondary or primary will be...
Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
Every circuit can be perceived as an copy since it's made from the same 'blocks' as other circuits. Making these blocks fit for your needs and demands is what makes somebody different from the cop crowd.
Btw I think 15kW is a bit high with only 1500 Apeak. You want a quite low bps for long sparks and a high on time. So relatively few bangs with high energy.
I would use a 100 cm high, 20 cm diameter secondary (1800 ish turns). The same size I use in my first DRSSTC and run it near 5kW. You should get some arcs like this (3.6 kW rms, 580A Ipeak)
Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
With the power and current your planning that shouldn't be a problem for your coil. Unless you build a way too large coil. You might even be able to do that whilst running the IGBTs within there ratings
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
how calculate delay for UCC37321 that ,HI will be 300ns later than in gdt? c is 470pf, need to calculate .R.then on capacitor is ~2,5V ucc turn on. GDT are 12v bipoliar
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
today i tested IGBT driver. here is some Uge waves. i have 18V turn on, and -8V turn off. Rg is just 3,2R, because Cge is two times greater than CM600's
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
BSVi wrote ...
Great work, Linas! Can I take a look at your IGBT driver schematics?
Here it is:
it's High Side IGBt driver, low side have over current protection based on IGBT driver MC33153, i just using Usat input and fault out output (go to isolator, and then into LM311 output)
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Linas wrote ...
today i tested IGBT driver. here is some Uge waves. i have 18V turn on, and -8V turn off. Rg is just 3,2R, because Cge is two times greater than CM600's
Your bricks have 4.3µC gate charge from -15V to +15V, whereas the CM600 has 3µC from 0V to +15V. Just so that you don`t feel unnecessarily sorry for your self .
Btw, your brass bolts are on the way, and should arrive right after easter....
Linas wrote ...
I wish I could understand what those 2 BS170'es are doing......
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Large DRSSTC [update]
