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Error "Derived parameter initialization for Vbe_sat failed to converge"

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Hi there,
I'm trying to model an IGBT using the N-Channel IGBT block (simscape electrical library), but I obtained the above mentioned error. From what I've observed it seems that the error is related to the value that I introduced in the "Collector current at which VCE(sat) is defined" parameter where I put 1.000A (same value as in the datasheet).
I'm using the Full I-V and capacitance characteristics variant and concretely equivalent circuit based on a PNP bipolar transistor and N-channel MOSFET mode.
These are the values that I've introduced in the main tab:
Ices: 10mA
Voltage at which Ices is defined: 1700V
Vge(th): 6.5V
Vce(sat): 2.15V
Collector current at which Vce(sat) is defined: 1000A
Gate-emitter voltage at which Vce(sat) is defined: 15V
Temperature: 150
Is there someone who knows how to solve the error?
Thank you in advance,
Ander.

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Accepted Answer

Joel Van Sickel
Joel Van Sickel on 22 Dec 2020
Hello Ander,
the issue is that RC and RE need to be lower to calculate a realistic Vbe-sat. I believe it needs to be lower than Vce. To do this, lower the values in the advanced tap of RC and RE. I tried lowering them both by a factor of 100 and was able to get it to work.
Regards,
Joel

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