Ac TIG welding project

Projects Programming
1

I have made few projets using Arduino Duemilanove - waste oil burner and heating control unit.
Now I am making TIG AC/DC welder but have no idea
I'd like to use same Arduino (Duemilanove/Uno)
I think that I have to change PWM frequencies

  1. PWM - 1-300hz made from internal EEPROM parameter (frequncy for square AC (constant during usage)
  2. PWM - aprox 10khz which percentatge continiously determined from analog input (curent sense using hall effect sensor)
  3. PWM - aprox 0.5hz - made from internal EEPROM parameter (for point/thin metal welding(constant during usage)
    LCD display conected thru i2c (analog 4,5), rotary encoder for parameter change
    in final stage I already purchased 300A 1200V IGBT transistors Totaly I have to reach 1 signal controling IGBT's
2

Have you used IGBT's of this size before? This is not trivial and may need a driving circuit.

3

You posted the same exact topic here: AC TIG ALUMINIUM WELDING - Motors, Mechanics, Power and CNC - Arduino Forum

Are you a troll?

4

To mstadtler:
Final stage is finished(finish test 10min ago) - at this moment I'm testing using NE555, LM324(inverting) IXDD414PI(driver) and 2MBI300P-140 IGBT's I got totally closed time for 40 microseconds @50hz and @250hz not depending on duty cycle. Tomorw I'll try conect them to VD306 - one of the best Soviet Union DC MMA welding station (Full power 500amps)

To gardner:
Not every smart man reads all topics :stuck_out_tongue:

5

How is the progress on this?