SUCCESS! TIG DC --> Advanced SquareWave INVERTER is working (prototype)

Ignoramus28489 · 2005-11-21T00:27:59+00:00

you see my first working prototype of the IGBT based TIGinverter. Again, this is an add on inverter for making Advanced SquareWave AC from DC supplied by the welding machine. Some highlights (see schematic page for component info: I used Semikron SKHI 23/12 boards for driving the gates I used four Toshiba 200A IGBTs, each of them is a half bridge,so I have two paralleled full bridges with 400 A capacity. A regulated current limited DC power supply was used fortesting No snubber circuit yet On the oscilloscope you see: top -- voltage across the AC rail. You see some niceripple caused by the lack of snubber circuitry. bottom -- voltage at the gate of one of the half bridges My plans include building a robust snubber circuit (I alreadyhave all components for a RC snubber), as well as fabricating asensible enclosure that would fit inside my welder. As I intended, no deadtime is seen here (the bridge conductsall the time, there are no transient "dead" intervals but there aretransient shorts). I feel that this is a nice milestone in my project. I feel that Ihave, in principle, proven that I can get to the completion of theproject. All I now need is not to fuck anything up. To that effect, Ishould make a nice snubber circuit and err on the side of overbuildingthat snubber. I should manufactore an enclosure that provides propermounting, vibration protection and cooling. After that, I should makesure that front panel controls are properly installed and areprotected from EMI.i

Nov 21, 2005 20 Replies

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Ignoramus22022 20 years ago

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SUCCESS! TIG DC --> Advanced SquareWave INVERTER is working (prototype)

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