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The purpose of the isolated supply is to power an isolated gate driver, so it has to have tiny capacitance since it's going to also be the supply for high side igbts. The DC-DC that the version 2C controller uses doesn't work as a high side isolated supply. YOu have to use a vla15151 or something similar, which is always out of stock and is around $18 each. I'm not sure if the simple switcher would work as a high side isolated supply, or how much they cost. One of the main goals is to lower the price of the AC controller board by a lot, since the mosfet version had 6 of the vla15151. The other goal is to make a replacement driver board for the IGBTs with parts that aren't out of stock. It's a small parts count, and it's only around $5-$6 for the isolated supply part.
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