Alternatively, for a simpler approach, take a look at this 12 kV single component isolation solution:
http://www.micropac.com/images/HVOC/66353%20Datasheet.pdf It's even space-qualified. On Sun, Dec 1, 2013 at 9:49 PM, Ulysses Balis <[email protected]> wrote: > Why not just make your own optocoupler? Fill a lexan or acrylic 10 cm > tube with clear, slow-setting epoxy and then affix an IR led on one and a > darlington phototransistor on the other end, with these two components > serving as end plugs for the epoxy. Then paint the unit black with a > low-voc paint. The resultant construct will offer over 100KV of permanent > breakdown voltage immunity. You'll need to make several of these for I2C > functionality. Alternatively, consider a micro power wireless local area > network, with an rf link serving as the data channel. Place two > bi-directional I2C transponders in a Faraday-shielded container, with 1 cm > ceramic mounting posts for each transceiver board, along with HV glass > passivated feed-throughs to make a permanently isolated HV hardened / > isolated construct. Optionally, fill the whole cavity with Sylgard 184 > (and let cure for 4 hours at 60C) when assembled for the ultimate in > dielectric breakdown immunity. > > -ub > > > On Sun, Dec 1, 2013 at 3:48 AM, Grahame Marsh < > [email protected]> wrote: > >> On 01/12/2013 01:22, David Forbes wrote: >> >>> On 11/30/13 11:13 AM, Grahame Marsh wrote: >>> >>>> >>>> I'm looking to pass a, i2c bidirectional data signal between two systems >>>> that have about 2kV voltage difference between their respective ... >>>> >>>> >>> Grahame, >>> >>> A quick Google search turned up this HP (Agavo) app note. It may or may >>> not help. There are amusing graphs of volts vs hours of lifetime. 2KV is >>> usually at 10 hours. >>> >>> http://www.avagotech.com/docs/5989-0802EN >>> >>> >> David >> >> 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. >> >> Cheers Grahame >> >> >> >> >> >> >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send an email to [email protected]. >> To view this discussion on the web, visit https://groups.google.com/d/ >> msgid/neonixie-l/529AF7FA.5000100%40googlemail.com. >> >> For more options, visit https://groups.google.com/groups/opt_out. >> > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CANX%2BaJj9i9SVF-0Wuobn8R-xMYM06GJBN0g9ik_CkSAgypbMyg%40mail.gmail.com. For more options, visit https://groups.google.com/groups/opt_out.
