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Thread: What's in the train? The whole story. PIC'a'Block
www.piclist.com/techref/microchip/devices.htm?key=pic
picon face BY : Russell McMahon email (remove spam text)



Azrael,

Inductive power transfer can be very efficient (over 90%) and is quite easy
to implement.
At the power levels you are liable to need a U core about 10mm x 5mm legs
would probably suffice if you can reduce the gap to a few mm (which you
should be able to do).

Signalling can be carried out over the same circuit with power off
(alternate between power and data),.
I am sending at 115 kbps over such an arrangement :-) although I do use
different power and data cores. Power core needs to be resonant if large air
gaps are used but is entirely workable non resonant with small air gaps.

Capacitive coupling is another useable signalling technique. You may even be
able to do power transfer capacitively if you have a high enough frequency -
although this may raise some challenging EMC considerations.


regards,



     Russell McMahon
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