Hi Grahame,
I don't know if this is of any help but if you want to go for the $1 solution I assume you like to test things with parts you already have lying around. I was thinking, you could use 2 optocouplers in series so that each carries 1kV. The only "problem" is that you need to have a power supply available between the 2 optocouplers that can carry a 1kV working voltage. For testing you could use a 9V battery, or a DC/DC converter as in attached drawing. The two 10M resistors make sure each opto carries half the total isolation voltage.
Cheers,
Michel
on Dec 01, 2013, Grahame Marsh <[email protected]> wrote:
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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