this is my basic design for switching performance for IGBT Sic. as attach.

from what i understand, IGBT turn on and turn off are controlled gate voltage.

base on the circuit design that i did:

• once it off, the gate current Ig flow until the input gate capacitance Ciee of the IGBT.
• turn on and turn off is decided by the values of ( R1,R2,R3,C1,C2)
• smaller value of resistance (R1,R2) results in a shorter charging time.
• (C1,R1) can speed up the turn on power.
• when the Vg is disconnected and the gate capacitance discharge into R3.

I hope to get some advice on my design...

 

That equivalent circuit is incorrect since it has base current going from the input. In an IGBT the base current is supplied from the collector voltage. This shows an IGBT equivalent circuit. The input basically looks like a MOSFET gate.