I have come across this question a lot in the design of a special 3 phase motor controller I plan to build this summer and I think I need to ask it directly to solve it.
I need to be able to modulate 3 phase ac with mosfets with a 12 to 24 volt dc supply voltage. I have this figured out for the most part I want to use only n type mosfets for phase symmetry. Driving them with a high power source relative to the main supply they are switching. I will use optical coupling to the MCU.
However I need to drive between 8 and 200 amps, the driver boards can be made separately in different capability ranges. But I don't think I can get around wiring mosfets in parallel this device also has to conserve space and weight.
What is the best way to create the driver circuit preferably out of surface mount parts?
Answer
You might investigate 'insulated gate bipolar transistor' (IGBT) technology. The high power 3-phase motor drives I've encountered (several 100's of volts x upwards of 100A) have been built around IGBT's, and were quite compact.
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