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Here's the idea for isolated supplies per driver. I came across it when they were talking about 4 isolated drivers vs. 6 isolated drivers in a 3 phase inverter. For very high current applications, the B- bus bar's inductance starts to be important. So, during switching, some of the mosfets would turn on at different times, because of the potential difference from one end of B- to the other. But if you have 2 different isolated supplies that are both really connected to B-, when the ends of B- have a potential difference, it doesn't matter. Take that to the nth degree with 1 isolated supply per mosfet, and you have the "ideal" situation, except that it's hopelessly expensive and complex. haha
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