Saturday, May 26, 2012

oneTesla

Update 11/7/2013: oneTesla has gained a life of its own and transcended to a new plane of existence! You can get a kit for one here.

oneTesla is a small DRSSTC with the entire driver (tank cap, voltage doubler, bridge, and logic) all on one PCB.
Tech specs:

  • Inverter: half-bridge of FGH40N60SMDF IGBT's
  • Tank capacitor: CDE940C30S68K-F, 0.068 uF@3KV
  • Primary: 4.5 turns of 14 AWG on a 3.5" PVC former
  • Secondary: 2.5x7", 36 AWG with a 2x7" topload. Resonant frequency is ~320KHz
200Apk, 270V bus, 40 uS ON@200BPS, 60VA out of the wall. Sparks are ~6" long
The interrupter lives in a separate box, and is coupled into the driver with coaxial cable. This works OK, though there are still some noise issues that cause the pulsewidth to fluctuate.

Schematic:

Get the Eagle board files [here] if you want to make one...its not quite perfectly reliable yet (in particular, it probably needs a optoisolated interrupter), but it does 6 or 7 inches at 100W fine.
If you're incredibly lazy, the DigiKey order for the most of the components (not the 40N60's), is [here]
Crappy phone video:
Random photos:
Board ready to etch
Primary current
Assembled board
Blindingly bright blue lights


5 comments:

  1. can i also use the HGTG20N60B3D igbt`s or are they too slow ?


    http://www.pollin.de/shop/dt/NDkwOTY4OTk-/Bauelemente_Bauteile/Aktive_Bauelemente/Transistoren/Transistor.html

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  2. They are too slow and have too low of a current rating.

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  3. and these
    http://www.reichelt.de/IGBTs/IRG-4PC-50UD/3/index.html?;ACTION=3;LA=446;ARTICLE=90433;GROUPID=2888;artnr=IRG+4PC+50UD;SID=10UGHZ2n8AAAIAAGJhoQ0e42f72f9a86e3468ade09d442257d501
    sorry i dont want to wait so long for the igbts from china :-) Im german
    and what current transformer do you use (how many windings)??

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  4. You want to get the FGH60N60SMD's from Arrow (which is most certainly not in China).
    I use this CT http://www.digikey.com/scripts/DKSearch/dksus.dll?Detail&itemSeq=119739217&uq=634842613340537351 from Digikey.

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