Quoth Grahame Marsh at 2013-12-01 19:18 ...
Thank you for the paper it has helped a lot - if I have read it correctly, the best performance is a catagory 3 opto coupler can stand off 1kVDC for > 100 000 hrs. So it looks like my search for a part ends 'cause there is no such part... back to the drawing board.
I've looked at comms with HV systems before. I2C it ain't - you'd need to do protocol conversions - but I figured TOSLINK would be a reasonably cheap option, considering availability of parts.
Currently trying to figure how to get a microcontroller to drive a regulator for the filament voltage of an X-ray tube (easy) but fully isolated (not so easy with up to > 40kV) plus monitoring the current. Discounted Bluetooth as too fiddly/unreliable - TOSLINK with half-metre optical fibres would isolate to about any voltage I'd want. UART comms, rather than I2C, though.
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