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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Dan: I quit doing the DRSSTC theory because it was making my head hurt and not going anywhere. I also decided to quit exhibiting at teslathons because of the money and hassle, and I decided not to try and beat Steve Ward's spark length record for the same reason. I guess I basically did all this stuff just to show off, and I can't be bothered any more.
However, I have a lot of IGBT bricks and capacitors stacked on top of my kitchen cupboards now, and I don't see any reason not to have some fun with them
Firkragg: If I drove both MOSFETs directly off the GDT, then they would both be "off" in between bursts. Then the IGBT gate could theoretically float to any voltage it liked. The VN10KM FET and its associated components are just an inverter that makes sure the bottom MOSFET stays "on" between bursts and clamps the IGBT gate to -12V. I tuned the component values so there would be no shoot-through between the two MOSFETs.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
I'm an idiot. What I tought was to connect Vcc rail to another leg of GDT to open the MOSFET by default, but I was faster in writing this than figuring out it will turn in chaos at end of burst. (inductve kick on secondary would mess up the thing). Inverter is rather a better idea.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Update on progress. I'm currently ordering parts to finish the new boards, both for myself, and a few other people. I sell a pack of all the parts you'll probably have trouble getting and won't know how to substitute.
The PLL boards are all sold now, unless someone cancels an order.
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Gorgeous, Steve!
Your boards are considerably more complex than my isodriver system, too ^^
Mine are crammed as closely together as non-surface-mount components permit. Even with a double-sided board, you couldn't get them closer =D It's a great feeling, and a topological nightmare, but I just love the spatial thinking involved.
...all I need now is pics... and not to hijack your thread.
What silicon are you using to drive the isolated power supply / ferrite?
I'm guessing for all the 'signal transformers' you're just using donut cores?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Hi BP
I never crammed my components that tightly. I planned to get it all on to a quarter Eurocard, but I had to lengthen it a bit. I had to leave room for the silkscreen, and even so, I had to put some of the component names under the components.
For the power supply I'm using two of the same STD12NF06 MOSFETs that I bought a pile of for the drivers.
The signal transformers are more ferrite sleeves really, they're a bit tall to be "donuts". I chose them because they were in the RS catalogue and looked about the right size. :P
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Odin The All-Fragger: a large DRSSTC
