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Hi Alvin! Some igbts have 2 in one package, that are in series. It makes it really easy to use 3 of those to form a 3 phase bridge, which is basically the power section of a 3 phase AC controller. Other igbts are just a single transistor, which would probably be used in a DC controller, although you could also just use 6 of those in a 3 phase AC controller.
We also need a control board that has a 15v supply that shares the ground with the 5v supply, and we need the control board to do something with the desaturation fault signal from the igbt driver board.
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