recently there was some discussion about diode reverse recovery adding to the noise & votlage spikes problems.
here is the best solution .. use SiC diode which has no reverse recovery!
new module by CREE is 1200V and 60A rated. digikey sells for around $500.
now maybe this is too expensive .. but there is another use where it may be worth while which is for applications where you want to deliver high power AND high switching frequency, this module will also shine. not much switching losses with very fast switching times. so if you had a very low inductance machine that you wanted a very high switching frequency to control voltage ramps at low speed (startup acceleration) then this is a great module. hint.. for switching frequency
> 20kHz, your deadtime will be a killer. it is not enough to compensate for the deadtime because the deadtime will already be introduced (but no harmonic problem cause they got compensated which is good) you must completely avoid the need for deadtime.
part reference:
http://www.cree.com/power/products/sic-power-modules/sic-modules/ccs050m12cm2