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Get a copy of the data sheet for the IR2184 from International Rectifier.
It is a half bridge driver that can switch the high side device in a system with 600V supply. Problem is these expect the load to be between the high and low switches. In our system the inductive load is in parallel with the high switch and I feel (without proof) that that creates problems as the high potential appears on the source of the high side device.
Hopefully someone in our little community can tell us that it will work anyway....
I don't think an extra power supply is required.
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