Re: High Power UHU Thread (HP.UHU)
Originally Posted by
kreutz
irfp4668: look at the SOA curve. At 30A the voltage limit is less than 100V. Not good for 130V motor. VR for the diode is specified at 100V.
irfp4768: The SOA is a little better but at 30A is about 130V, it is not good to work at the limits of the SOA.
The values of those resistors depend on the total gate charge of the Mosfet and dV/dt required.
Best regards,
kreutz
kreutz, Isn't that SOA showing total wattage in linear mode ?
IF your MOSFET is conducting 30 amps, i would assume the voltage across the mosfet is 30amps * 0.009 ohms which is 0.27 volts.
This mosfet seems easily rated to handle a 30 amp motor at 130volts.
But to drive a Mosfet with that much gate capacitance you would need programmable deadtime. and a lot of drive. And your switching freq would probably need to be about 10khz or lower. , imo
Larry K
Manufacturer of CNC routers and Viper Servo Drives
www.LarkenCNC.com and www.Viperservo.com