Using 4 individual IGBTs to create 1PH VFD

Discussion in 'The Projects Forum' started by Dusan, Mar 17, 2013.

  1. Dusan

    Thread Starter New Member

    Mar 7, 2013
    3
    0
    I'm trying to create a single phase 120VAC VFD to run an AC motor at variable speeds.

    I plan to use 4 individual IGBT's, logic level gated, to run this motor.

    My question about IGBTs is (can't find an answer anywhere) - will they operate normally even when the emitter is not connected to ground?

    Obviously two out of the 4 IGBTs will have their emitters connected to the AC Motor, and the other 2 IGBTs will have their emitters connected to ground.

    Any input is appreciated, thanks.
     
  2. antonv

    Member

    Nov 27, 2012
    149
    27
    I think they will work since you will have their emitters still connected to a driver ic of some kind. I believe you drive them like high-side MOSFETs meaning you need a boot strapped driver to raise their gates above their floating emitters.

    See this app note:
    http://www.ixys.com/Documents/AppNotes/IXAN0010.pdf
     
  3. Dusan

    Thread Starter New Member

    Mar 7, 2013
    3
    0
    I will be using an Arduino Microcontroller to drive the IGBTs
     
  4. antonv

    Member

    Nov 27, 2012
    149
    27
    If you are using IGBTs I assume you are talking higher power. Without knowing details of the parts you want to use the Arduino probably does not put out enough current to turn the IGBTs on and off fast enough.
     
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