IMPORTANT, I am not trolling, and if I am asking stupid questions, that's due to my ignorance and malice.
A while ago I asked for suggestions regarding making a square wave inverter to convert a DC TIG welder into an AC TIG welder.
Many things happened since that time.
- I bought a real DC TIG welder for .99. See it here.
Auction:
My page with more pictures and my experience so far
- Spent many times its cost of .99 on cabling and various welding doodads and consumables.
- I played with arc welding, trying to learn to weld (see above links).
Now, I am a little closer to the aforementioned inverter project. I bought four Toshiba IGBT, mounted on a heatsink:
Auction:
Note that each IGBT is a complete half bridge, so I need just two, out of the four that I bought. My welder is a 200 A constant current welder, so it would not exceed the 200 A limit of the IGBT. I set welding current digitally, using a digital potentiometer on the control panel of the welder. Thusly, I could, supposedly, get away with using just two IGBTs, one for each half of the H bridge.
The welder's welding voltage is 28V and OCV is 85V. The IGBTs are rated for 1,200 V.
Since wavetek 171 can put out pulses of adjustable width and frequency, I can use it as the control of this inverter. Wavetek's output will be the input of the IR2011 chips.
For power, I will try to use a computer power supply.
I read various relevant application notes and schematics, by now.
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