[z_power]

Hi,
(first post from longtime lurker who'll introduce himself wider when he has something more to contribute...)
Being interested in power section based on IGBTs rather than MOSFETs I keep my eye on eBay as a source of cheap modules; I'd like to know your opinion on Fuji's 1MBI600U4B-120. This is single transistor module similar to 1MBI600PX-140 IIRC used by jackbauer and etlaare. It's available from well-known-here german supplier at slightly bigger price (30 vs 25 EUR) but:

- lower CE saturation voltage - 2.4 vs 2.85V - lower conduction losses
- Ton - .32 vs .75 us
- Toff - .41 vs .65 us - lower switching losses
- reverse recovery time .35 us for both of them - important if using one as freewheeling diode

What's your opinion on using 2 modules (one as FWD) in ~500A 144-192V power section? Switching frequency at 8 kHz is probably the key; using 15V driver supply wouldn't hurt, either. Any extra mods suggested?

Regards
Mike