What is difference between ultrafast IGBT and Field stop IGBT???

[electroM]

What is difference between ultrafast IGBT and Field stop IGBT???

 

[mrinalmani]

Ultrafast IGBTs have a small turn ON/OFF time delay. This reduces switching losses. They are generally "Non-punched through" types. However the on-state forward drop (VceSat) of these IGBTs is not as impressive, therefore resulting in larger power loss due to forward voltage drop.
FS IGBT on the other hand, have fast turn on/off time as well as low forward voltage drop. These are generally available between 1KV to 1.4KV

 

[electroM]

Thanks mrinalmani for quick reply. I had one more question in above context
which type of IGBT should I chose to design Inverter whose firing logic is developed on FPGA????

 

[dick_freebird]

That would depend a lot on what kind of chop rate you
are considering, and what conduction loss vs switching
loss trade you are happy with. I think a little spreadsheet
work would help you with that decision process. You can
probably find something good enough on the Web, to make
a start.

 

[mrinalmani]

That depends on three things
1. Desired switching frequency
2. Voltage and current rating of the inverter
3. Amount of money that can be spent to bargain the efficiency.