Problem in conduction loss measurement in inverter

Question

Hi,

I don't understand, I'm trying to determine conduction and switching losses in a 10kHz inverter made of OGBT and diode devices. The respective conduction and switching losses are so huge, even filtered on 0.0001s, than the total efficiency diverge. Could you help me please to correctly determine the losses?

Thanks

Answer 1

Hello,

I took a look at your model and think this is a multi-layered issue. You should first isolate the electrical system and make sure that you are satisfied with its operation, including at steady-state. I don't believe the waveforms all look at you might expect, for example the output current. You may need to add damping, or general adjust the output voltage source/inductance values. Also, the phase b inductance doesn't match the other 2 phases. Once your electrical circuit performs correctly, you can add the thermal model and check that that works properly.

Regards,

Kris