Hi
Thanks for all the comments I have now found this $5 part
/With creepage and clearance of greater than 13mm, the ACNV2601 is
designed to provide high isolation voltage (7500 Vrms). It can withstand
a continuous high working voltage of 2262 Vpeak and a surge voltage of
12,000 Vpeak//
/
http://www.avagotech.com/pages/en/optocouplers_plastic/plastic_digital_optocoupler/10_mbd_logic_gate/acnv2601-000e
The datasheet says VIORM = 2262V
So, unless I have (again) misunderstood the isolation voltages, this
does the job with 10% headroom. Change the protocol from i2c and I'm
there. I would appreciate correction if I'm wrong.
Grahame
On 01/12/2013 21:46, Michel van der Meij wrote:
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 had thought about, but not looked, at other protocols - I was
looking
for the $1 part that would do the job!
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