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Re: Sold state IGBT disruptive coil spark gap idea
Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
Hi,
I have been working on making the actual SIDAC/IGBT gap. Maybe it
could be called a "SISG" for Sidac Igbt Spark Gap. It gets sort of
bad though when we have to have abbreviations for abbreviations
:o)) There must be a "long story" behind "SIDAC" :D
The PC board becomes economical with a bunch of circuits are put on
one board like this:
http://hot-streamer.com/temp/SIDAC-IGBT-a-pcb.gif
I had to use a smaller cap and gate resistor but that is trivial. I
can either use #6 screw hardware, solder directly, or use those PCB
terminal blocks for the primary loop connections. The tight layout
should help keep the gate voltage from overdriving like my hand-wired
board does (wiring inductance at very high current). Other boards
can be mounted turned 180 degrees to help make many of the interconnections.
The only worry is how to heat sink the IGBTs. If I am really lucky,
they might be fine as is. The "SUPER 247" package does not have
normal screw holes but is a clip mount thing. I might be able to cut
aluminum and drill it for clip holes or just epoxy them on. These
are 595 watt devices (!!) (I assume that is bolted to a glacier of
frozen helium...) so gluing a heatsink for 5W is probably fine
too. I found an IGBT with twice the die size of the old ones so
maybe they will really crank out some current beyond 350 amps! They
apparently grove the die to give it the surface area of a cow or
something... The price is higher but not prohibitive for this
already expensive thing. The rated current is limited by the package
leads vaporizing :-)))
BTW - I am not selling boards since I need to be sure it really all
works and the layout is right. If there is interest maybe there
could be a bulk buy of nice boards and all. But we have to be sure
it works rock solid first. If anyone just has to try it now, the
file for ExpressPCB is here, but zero guarantees:
http://hot-streamer.com/temp/SIDAC-IGBT-a.pcb
Cheers,
Terry