Author Topic: Starting on first coil, Medium DRSSTC  (Read 218 times)

Offline AeraCura_

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Starting on first coil, Medium DRSSTC
« on: February 19, 2021, 07:38:18 PM »
Hi all,

After much consideration I'll soon begin construction of my first coil. I've purchased most of my parts but would encourage feedback on my proposed design.

Design details as follows:

  • Bridge: 2x CM300DY-24H in full-bridge
  • Bridge supply: 4x 6000uF at 350V, configured 2s2p for voltage doubling 220V at 6000uF  700V
  • Bridge rectifier: IXYS VUO110-12N07, 3~ rectifier choose due to same terminal height(30mm) as CM300 IGBTs
  • Snubber caps: RBPS20591KR6GNZ
  • Primary: 1/4" tubing with 1/2" spacing 10 turns taped 5.8 turns
  • Secondary: 2000 turns of 28 AWG on 6.625" x 30" form
  • MMC: 5s10p 942C20P15K-F for 0.3uF at 10KV
  • Topload: 6.625" x 30" toroid
  • Controller: Loneoceans UD2.7C
  • Interrupter: TMaxElectronics MidiStick


JAVATC dump:


Overall I'm hoping this is an average build without many suprises, Ive basically designed for the most ununique setup possible as I hope to learn the basics before going bigger.

Offline acobaugh

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Re: Starting on first coil, Medium DRSSTC
« Reply #1 on: February 19, 2021, 07:53:05 PM »
On paper sounds similar to my DR81 system: https://labs.cobaugh.io/hv/tesla/dr81/

With a bigger topload, MMC, and secondary, you could easily stretch that bridge even further down the road if you choose.

What peak current were you designing for?

I really think the limiting factor in your design will be the toroid size and distance from toroid to primary, if you want sparks longer than, say, 6 feet or so.

Online Mads Barnkob

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Re: Starting on first coil, Medium DRSSTC
« Reply #2 on: February 20, 2021, 07:51:43 PM »
Looks good and with plenty of head room on almost all components. You will have problems with heating in primary / secondary coil before IGBTs/MMC, so you are building it like a tank.

Sure it could easily drive a much large coil, but that will also cost a fair amount of additional money to get a bigger MMC.

Make sure to have enough extra primary coil turns to detune the primary up to maybe 20%? 10% is properly more reasonable...

Looking forward to see it come alive!
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Offline AeraCura_

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Re: Starting on first coil, Medium DRSSTC
« Reply #3 on: February 21, 2021, 07:09:56 PM »
Thanks for the info. I'm okay with my bridge being over spec'd, It's possible that I use this at annual fairs so having a coil I can dependably throw long on-times, hight BPS, or overall run times at is important.

Quote
I really think the limiting factor in your design will be the toroid size and distance from toroid to primary, if you want sparks longer than, say, 6 feet or so.

I was simply following a general rule that the bottom of the toroid is in the same plane as the top of the secondary and toroid major and minor diameter match the secondary. I've messed with these numbers in JavaTC and dont see much change in rF. However, JavaTC says nothing about spark length. Can you elaborate? Also any info on how to draw a correlation between parameter selection or what JavaTC spits out and spark length would be helpful. Is it really as simple as V = L di/dt. Decide on a spark length using the known kV/cm breakdown in air and spec secondary inductance and on time appropriately?

Quote
Make sure to have enough extra primary coil turns to detune the primary up to maybe 20%? 10% is properly more reasonable...
When you say detune do you mean drop or raise frequency? If I have 10 turns on the primary to produce rF of 38kHz and I tap at 5.8 turns to match the rF of my primary for 70kHz does that leave enough extra turns?



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Re: Starting on first coil, Medium DRSSTC
« Reply #3 on: February 21, 2021, 07:09:56 PM »

 


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