On 01/12/2013 09:32, Matthew Smith wrote:
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.
Hi Matthew
I had thought about, but not looked, at other protocols - I was looking
for the $1 part that would do the job!
Standing off 40kV is much more fun...
Cheers Grahame
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