High side N-Channel IGBT/Mosfet drive methods
If you use one transformer per IGBT only, then flux walk will become a problem depending on duty cycle. Then you usually add a capacitor in series on the driver output line - for achieving better results even the IGBT side will get an AC coupling circuit.

Take Lazlo Balogh's AN and look for AC coupled transformer gate drive for a discussion in detail.
Here the corresponding excerpt:


Using this approach, i.e. 1 transformer to drive 2 transistors (one high, one low side) I wonder how a delay circuit would perform to ensure the proper switching delay. I quickly put together an example: