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Half bridge drivers, several questions

Discussion in 'Electronic Design' started by Ignoramus19740, Oct 5, 2005.

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  1. Thanks to many suggestions received here, I am a little clearer on the
    power side of the DC to AC inverting.

    Now I am looking a little bit more on the driver side.

    I am trying to figure out what is the best IC driver for my TIG
    welding inverter. As I learned yesterday, there are many
    choices. Ideally, I would like to find a chip that has a built in
    timer and can change width of high vs. low side as percentage of the
    oscillation period.

    Less ideally, I could take a chip such as IR21094, and run it from a
    separate timer or a signal generator.

    So, my first question is whether there is any chip that's easiest to
    use. I wonder why there are no chips (that I could find) that would
    have a built in oscillator (like IR2153) and drive a full bridge
    (like some other chips do) and have pulse width modulation also to set
    pulse widths for positive and negative pulse duration.

    My second question is whether these chips produce negative voltage or
    zero voltage when they turn off a side of a bridge. The IGBT manual
    that I read said that it is better to stop current by applying
    negative voltage to the gate, rather than zero voltage. I could not
    figure it out from reading the chips' datasheets.

    thanks, and if my questions are wrong, do not hesitate to point this
    out.

    i
     
  2. Ian Stirling

    Ian Stirling Guest

    I wonder if some of the 'Class D' audio amp chips from TI et al might suit?
     
  3. Ian, do you have any specific chip in mind?

    Note that a chip that would drive these IGBTs, would have to switch
    them quickly.

    As of right now, I am looking at IR2109 chip, myself.

    thanks

    i
     
  4. Ian Stirling

    Ian Stirling Guest

    I was meaning to generate the PWM signal, from a 'audio' source (which in
    this case would be a control voltage).
     
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