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  1. #1
    Join Date
    Dec 2007
    Posts
    2

    Default Inverter Technology

    Hi guys.
    As you can tell, this is my first post and yes, I am new and just learning the welding field. I just received an early Xmas gift from my wife. It is a Miller Dynasty 200DX. It is a beautiful piece! Almost nicer than my wife.
    I am also in the process of putting together a presentation for a course in welding that I am taking.
    I have to put together a presentation of advancement in GMAW process and how Inverter Technology is the new way.
    Is there a link or can someone break it down for me in how inverter technology works, in simple form? I do have a little electrical back ground, from years ago!
    Thanks and I appreciate your time.

  2. #2
    Join Date
    Aug 2006
    Location
    N.C.
    Posts
    362

    Default

    George W. Bush was saving your butt whether you liked it or not!
    Fear is temporary, regret is forever
    HH210 with SG

  3. #3
    Join Date
    Dec 2007
    Location
    southern B.C
    Posts
    51

    Default invert tech

    hope this helps. this took me quite a while to compile[simple brain]

    power goes in @ 60 Hz AC, enters machine through an input rectifier assembly [changes AC to DC].

    then passes through input capacitors [acts to store power to induce current in the IGBT]

    passing through input capacitors power enters IGBT [Insulated Gate Bipolar Transistors] these are what makes the inverter different from trans technology. IGBT is responsible for changing the rectified DC current to high-frequency AC.

    then current passes through the primary transformer, stepping down current to make a useable welding current [high voltage/low amperage changes to low voltage/high amps]

    then current passes through output rectifiers changing back from AC to DC.

    and last but not least current passes through output filters to "clean" current, finally exiting @ 32K Hz DC or an AC current if your configuration allows it.

    I know it seems long winded but I also had a great need to understand these machines so when someone asks me what an inverter does I didn't feel like a moron because all I could say was " it's a welder".

    hope it helps

  4. #4
    Join Date
    Dec 2007
    Location
    southern B.C
    Posts
    51

    Default inverter

    wikipedia states that an inverter is a "electronic circuit that converts dc to ac"

    careful how you interpret this

  5. #5

    Default

    Ron

    ShopFloorTalk

    Millermatic 350P, Roughneck 4012 and Ironmate guns
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  6. #6
    Join Date
    Dec 2007
    Location
    Los Angeles
    Posts
    2,847

  7. #7
    Join Date
    Jan 2007
    Location
    Noth Dakota
    Posts
    505

    Cool

    Inverter technology is not new. It has been around since the days of vacuum tubes. (did I just date myself?). When our power supply died and none were to be found, we got three units that took 115v 60hz and converted that to 3 phase 115v 400hz. Worked till dismantled. Yep I can safely say the electronics of today is packaged a lot smaller than back then.

  8. #8
    Join Date
    Aug 2006
    Location
    near rochester NY
    Posts
    9,881

    Default

    969c1
    good to have ya with us. lots of great people here with good info to share.
    thanks for the help
    ......or..........
    hope i helped

    feel free to shoot me an e-mail direct i have time to chat. james@newyorkmetalart.com
    summer is here, plant a tree. if you don't have space or time to plant one sponsor some one else to plant one for you. a tree is an investment in our planet, help it out.
    JAMES

  9. #9
    Join Date
    Dec 2007
    Location
    Near Lancaste PA.
    Posts
    3

    Default

    I imagine you already understand a basic electrical transformer... wrap a wire from the input AC voltage, around an iron core. For the output take another wire, and wrap it around the core as well. If the input wire is wrapped around the core 10 times, and the output wire wrapped around 20 times, then the output will be twice the voltage, and half the current. Likewise, you can change the ratio of turns to generate any increase or decrease of voltage(and inversely the current).

    An important issues is that the core (an inductors) must be sized according to the frequency used. The lower the frequency, the larger the core must be. The main advantage of switching power supplies is that it reduces the weight of the assembly by reducing the size of the core.

    The trick they use is to first change the 60hz input into a much higher frequency, and then the core, which follows, can be much smaller.

    Joe Dunfee

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