Any reason an induction coil can not be used, Over that gap a coil on each side would be easy, drive one and rectify the output of the other - same principal as the non contact chargers being mooted for laptops / phones etc...
Inductive coil would indeed be the obvious choice but they are too big as this whole device is supposed to be the size of the capacitive plates
there is still a lot of necessary system level info that could be useful - is there air clearance requirement or just 30KV isolation - transformers can be built with high isolation
is the connection rigid or have to permit relative motion? - how much - # axis, degrees of freedom, motion range - magnetic coupling with rotorary cores?
motion while operating or just for assembly?
is there max electrical impedance - bigger C with smaller separation across a good dielectric?
limited area for the interface? - 30 uW could be provided with lamp/LEDs shining on a stack of solar cells but 1 cm^2 could be a little hot on the source side [edit; acutually no too bad - less than 1 W into IR LED array matched to Si photovoltaiacs should do fine]
how much bandwidth does the information channel require - what reliability/dropout rate? bidirectiona/full duplex?
is the connection rigid or have to permit relative motion? - how much - # axis, degrees of freedom, motion range - magnetic coupling with rotorary cores?
motion while operating or just for assembly?
is there max electrical impedance - bigger C with smaller separation across a good dielectric?
limited area for the interface? - 30 uW could be provided with lamp/LEDs shining on a stack of solar cells but 1 cm^2 could be a little hot on the source side [edit; acutually no too bad - less than 1 W into IR LED array matched to Si photovoltaiacs should do fine]
how much bandwidth does the information channel require - what reliability/dropout rate? bidirectiona/full duplex?
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I take it the purpose is to transmit a small amount of power accross a 1cm gap, The object being to power some device.
This looks like RFID 😱 I missed the referance to 13.56mhz - RFID territory it is, Hmm the usual mini arial provides enough power for active tags from a local (close transmitter) why go for capacitive coupling. the tags seem to work unless encased in tin foil to keep readers out of passports
😕 would a capactive reader work through tin foil? 🙄
This looks like RFID 😱 I missed the referance to 13.56mhz - RFID territory it is, Hmm the usual mini arial provides enough power for active tags from a local (close transmitter) why go for capacitive coupling. the tags seem to work unless encased in tin foil to keep readers out of passports
😕 would a capactive reader work through tin foil? 🙄
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