When I search Google Images for "IGBT rectifier", I notice that they all appear to have floating gates.
But don't IGBT's have gates like the ones on MOSFET's, in which it's insulated from the other pins on the transistor? How do they work without an input to control the gate voltage? Wouldn't this be terribly sensitive to the environment. Why don't these rectifiers have gates connected similarly to the ones in MOSFET rectifiers like the one below.
On the side note, I also notice that the IGBT rectifiers all seem to be 3-phase.