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need help igbts welder

Discussion in 'Electronic Design' started by kidkv, May 30, 2006.

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  1. kidkv

    kidkv Guest

  2. Well, you do not have to deal with paralleled igbts (unless you want
    to go above 200A). I do not think that that person actually go to
    having a working welder.

    i
     
  3. kidkv

    kidkv Guest

    i have 4 and only need to use two of them and they take 400amps for 1ms
    note my welder gos to 225A and the one i got this from does weld with
    it hears what he sad from his web site (Just for interest the devices
    used in the Alpa test version of the unit were IRG4PC40F (600v 27amp,
    these will handle 49 amps in pulsed mode ! 4 pieces were parralleled
    for each section of the H bridge.
    I later switched to a higher current device G30N60B3D which is good for
    600v 60amp (220amp pulsed). Also used was an ultra fast switching diode
    to protect the device junctions part number: MUR1540 (600v 15a) ) so
    should i take out something or chang out something ???
     
  4. kidkv

    kidkv Guest


    witch capacitors would br best in it?????
     
  5. I would suggest Cornell Dubilier snubbing capacitors, like their
    series 943.

    i
     
  6. kidkv

    kidkv Guest

    ok, and what abouth the 470nf caps and the ones on the igbts ??
    thears more of this circuit print it out its 20"x40" its big :)
     
  7. kidkv

    kidkv Guest

     
  8. are those on IGBTs or on the IR2110 gate driver?

    i
     
  9. kidkv

    kidkv Guest

    IR2110 gate driver C18,17,19,20 are the 470nf and the 1nf caps on
    the igbts
    ok;-)
     
  10. You need to read the IR2110 datasheet. I am surprised that you say
    that caps across IGBTs are 1 nf. There is also an application note
    explaining some issues if using IGBTs to make inverter welders.

    i
     
  11. kidkv

    kidkv Guest

    i did read the application notes and some more and they both say
    something else,
    and the caps are on the driver board for the igbts the one that are in
    the circut that i am asking abouht are C1 to C16 in the circuit the
    application notes say not to use them then one site says to use them
    that why i need help on this as take them out or not???
    the igbts are the same ones that you had on your first setup;-)) from
    the same one on ebay
    i know the caps C21,C22,C23,C24 are to stop voltage spikes from
    takeing out the igbts
     
  12. I used different driver boards by Semikron. (also off ebay). These are
    very good. They did all I wanted without messing around with
    complicated schematic. All I had to build as an oscillator.

    Application notes (can be found somewhere on my site) explain how to
    calculate snubbing capacitor capacitance. You also need a brief period
    when both sides of the bridge conduct.

    i
     
  13. kidkv

    kidkv Guest

    i have the notes from your site. i just dont get what the notes say
    and this has a what new welders have " max current ,start current ,weld
    frequency ,end current ,pulse frequency and gas on and off time
    ,duty cycle ...
    the one that did it up used cmos, ttl chips.. first time doing
    something with this many amps so you can see why i need the help i dont
    whant to blow up the igbts
     
  14. kidkv

    kidkv Guest

    would it be safe to put them in to the circuit for now or should i take
    out some stuff and should i use film caps on the driver board the data
    sheet for the IR2110 on what type of cap should be used as to film or
    ceramic cap for the 470nf=.47uf and the 1nf=.001uf
     
  15. kidkv

    kidkv Guest

    i have the notes from your site. i just dont get what the notes say
    and this has a what new welders have " max current ,start current
    ,weld
    frequency ,end current ,pulse frequency and gas on and off time
    ,duty cycle ...
    the one that did it up used cmos, ttl chips.. first time doing
    something with this many amps so you can see why i need the help i
    dont
    whant to blow up the igbts
    would it be safe to put them in to the circuit for now or should i
    take
    out some stuff and should i use film caps on the driver board the data
    sheet for the IR2110 on what type of cap should be used as to film or
    ceramic cap for the 470nf=.47uf and the 1nf=.001uf

    would ac film suppression caps work for the out put to kill the spikes
    ????
    and for the rest should i use polyester film caps i have been looking
    at wima caps ????
     
  16. You have not stated many details about your project, and it is just
    about time.

    Are you trying to make a inverter welder? Are you redoing an existing
    welder? What do you want to accomplish?

    The first thing that I must say is that if you have the brains and
    skills necessary to figure out how to make such a welder from scratch,
    you would be better off buying a brand new Miller welder for several
    thousands of $$ and using your skills to make money elsewhere. That
    said, if you like to have fun inventing stuff, there is nothing wrong
    with it.

    So... You need to give some details of where you are and what are your
    intentions.

    I think that I would do this work in stages, not least because you
    would be learning as you go, moving from one working prototype to the
    next. Rather than assembling some contraption that surely would not
    work, and then realizing that you forgot something at earlier stages
    that cannot be easily corrected.

    That's a computer programmer's approach.

    The first stage would be to make a DC power source with no bells and
    whistles. (that itself is a big task). Just a basic stick welder.

    If you get here, it would already be a huge accomplishment and you
    would be able to do a lot of real life welding with that.

    If you get thus far, a sensible next step would be to make a high
    frequency arc starter. (could be easier to just buy one, a respectable
    choice)

    Then, you can move on to make a basic TIG welder, with a two stage
    pedal (one stage for gas control, another for turning on arc).

    The last step, the inverter, is very independent from everything else
    and can be done much later. And can be skipped altogether.

    Really, most real life welding can be done without the inverter.

    i
     
  17. kidkv

    kidkv Guest

     
  18. kidkv

    kidkv Guest

    yes i am trying to make a inverter welder i have a stick welder and
    have 4 diodes on it to get dc with 2 big cap, and did up a HF starter
    for it and have a tig torch and have done some welding with it but the
    HF starter will not work with the welder on ac and i have the igbts i
    did up a foot pedal that turns on gas and the HF starter......
    i need to get this done becoz 30amps will go throu sheet metal
    and i like doing this
    and hears the site that has the circuit for this
    http://www3.telus.net/public/a5a26316/TIG_Welder.html
    he has more work and can not get to emails a lot of the time and i did
    email him and got some info but he does not have much time!!!!!!!!!!!!!!
     
  19. kidkv

    kidkv Guest

    forgot this i did have in mind to use the monolithic function generator
    XR-2206 but i found that circuit and plan to use it and it will give me
    what i need
     
  20. kidkv

    kidkv Guest

    plus it would cost 1.082.00$$ for a tig welder that would not weld
    Aluminum
    tig for aluminum would cost 1,338.00$$
    cost so far
    welder free
    tig torch witch is water cooled 60.00
    igbts 40.00
    caps and neon transformer 15.00
    4 diodes 400 amps 20.00
    foot pelal made it
     
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