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If I just add one extra PWM for IGBT control on my contro/driver board, and a big fat 50 pound 200amp inductor (off the shelf. I have one!), you can do an AC controller with an input boost stage (it's a buck stage during regen). The bad part is, the input IGBT sees the high input current and the high output voltage. The worst of all worlds. haha. But not that big of a deal if you are willing to go half way to the required 650v.
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