http://www.pwrx.com/Michael,
Powerex is just one mfg. of power mosfets and IGBTs Whether you use IGBT's or mosfets, you still need to isolate the signal from, and reference the drive to the emitter or source. This link will probably provide some useful info for you. Our driver boards use an Agilent driver chip but I don't remember it's #. I'm starting to feel like you are much more system minded than a circuit nerd so perhaps you shouldn't get to the component level. This thread probably belongs in the theory area when we aren't talking about off the shelf systems.
Joe
