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Registered Member #1376
Joined: Wed Mar 05 2008, 08:31AM
Location:
Posts: 49
Hello, I have build a spark gap coil 4" diam 24" high coil 9 1/2 turns primary, single MOT and 1a variac. I am not after power anymore, but efficacy.
That is why I am going to "try" and build a DRSSTC, I know all about the theory of operation and have tried a solid state coil but failed miserably. Now I need help, I think I know why, because the mosfets I used were rated for 4a, 400v, the mosfets can't Handel the amper fluctuation.
So now I am asking anyone who knows a good igbt that can handle the power from a 240v 1a variac. I am going to use a half bridge.
Perhaps these will do???
Also, For my DRSSTC I am going to use the same Primary Coil, Secondary Coil and tank capacitor, as it is tuned. Would this be alright? Or do I need a complete rethink?
Registered Member #1376
Joined: Wed Mar 05 2008, 08:31AM
Location:
Posts: 49
Ok guys, here is some infomation...
"Insulated gate bipolar transistor with ultrafast soft recovery diode. VCES = 600V, VCE(on)typ. = 1.65V @ VGE = 15V, IC = 27A in 3-pin TO-247AC package. Operational temperature range from -55°C to 150°C."
This is the IGBT I am looking to buy, is 27A to low? Keep in mind i am using a 1A 0-249v variac.
Registered Member #1157
Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307
I would take a look at Austin's thread on the Minibrute. He has Dan and Wirenut as well as the rest of the veterans of DRSSTC's going on a good design. They also discuss several IGBT's.
Registered Member #1376
Joined: Wed Mar 05 2008, 08:31AM
Location:
Posts: 49
Uh,, yeah... thanks, but that still dose not help me, does anyone have first hand experience here? My main worry is that 27a IGBTs are to low and will blow when the Tank circuit gets going..
I am going to roughly follow this guide here by Steve Ward, the "master".
The only deference is my power for the controller circuit will be slightly lower powered, and the diodes will follow suite. And the power input for the power electronics will be 1a 240v variac.
Also, can the controller circuit in the link above be assembled on a strip board? Or do you need to do some etching?
And yeah,, I know this is the worlds most newbish Question, but no point in not knowing! What the heck are them li'll arrows or "triangles on the circuit board??? they are everywhere, but to name a few, on the bottom of "D2" "C2" "C14" "74HC109N pin 8" and "UCC37321 pin 4" on both U3 and U4. I think they are ground, no? which would mean that all them triangles would be connected together. Thank you in advance.
Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617
worry about the igbt's pulsed current rating not continuous. Almost any Igbt can be used in a coil you'll just have to use good judgment on what they can handle. Or just try them.
You can assemble any DRSSTC or SSTC circuit by hand, no need for etching. Just keep wires thick and short as possible on the power devices.
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Which IGBT?
