Hi all,
I am making an IGBT inverter based PMSM motor controller. Operating voltage of the inverter is 330V(DC). I have chosen 1200V/150A rated IXYS igbts as power switching devices. My gate drivers produce +15/-8 PWM signals to control them. My anti parallel diodes are rated to 1200V/ 150A as well. Operating PWM frequency is 5kHz.
Basically I tested them with 150V(DC) power supply. It worked nicely and inveter took around 75A from the supply. Then I stepped up the inverter voltage to 330V and tested the system. But the motor did not run properly because IGBT's failed in lesser supply current values.
Then I inspect waveforms using an oscilloscope and I saw that Vce is not responding to Vge in some intervals. I have attached the oscilloscope image below which I saw many times.
Is this the IGBT latching problem? or should there be any other reasons to generate this kind of a waveform (Anti parallel diode failure, etc) in motor controller inverter?
Please help me to solve this problem.
Thank you.
I am making an IGBT inverter based PMSM motor controller. Operating voltage of the inverter is 330V(DC). I have chosen 1200V/150A rated IXYS igbts as power switching devices. My gate drivers produce +15/-8 PWM signals to control them. My anti parallel diodes are rated to 1200V/ 150A as well. Operating PWM frequency is 5kHz.
Basically I tested them with 150V(DC) power supply. It worked nicely and inveter took around 75A from the supply. Then I stepped up the inverter voltage to 330V and tested the system. But the motor did not run properly because IGBT's failed in lesser supply current values.
Then I inspect waveforms using an oscilloscope and I saw that Vce is not responding to Vge in some intervals. I have attached the oscilloscope image below which I saw many times.
Is this the IGBT latching problem? or should there be any other reasons to generate this kind of a waveform (Anti parallel diode failure, etc) in motor controller inverter?
Please help me to solve this problem.
Thank you.
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