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IGBT gate drive


James Sweet

Jan 1, 1970
I have a Fuji 6MBI100UB-120 IGBT 6 pack that I'm looking to use for some
motor drive experiments. This is my own personal project and not
something that will ever go into production so I'm not terribly
concerned with getting the BOM cost to the absolute minimum. It seems
gate drive is a deceivingly complex subject and good information on
calculating the requirements is hard to come by. Assuming a 3 phase
bridge configuration, 340V DC rail (so 600V ICs should be adequate) and
a PWM frequency somewhere in the range of 12-20 kHz, what approach would
you guys take? Can I get away with something as simple as one of the
many bootstrap high/low driver ICs, or am I going to need to go with
something more complex like optocouplers with DC-DC converters supplying
the floating gate drive voltage? I'd like to avoid messing with gate
drive transformers if possible, magnetics are where I'm least
knowledgeable. I've used the NCP5111 from On Semi for driving small
mosfet bridges with success but I gather this is not gonna cut it for
such large IGBTs.