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My thinking is a 300-350v dc bus for 600v IGBTs, and a 600-650v dc bus for 1200v IGBTs. I know a friend has made a 3 phase PM Synchronous inverter without snubbers and without any sort of filtering. It ran at 330v DC. He uses 600v intelligent power modules and film capacitors and doesn't have a problem. I haven't looked at the waveform with this setup yet. I'll still waiting on the boards to get here. I really hope reflected waves aren't a problem. The 3 phase leads should be very short though, so maybe it won't be a problem.
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