Why have power supply via induction?
Hey!
In the very small amount of projects about implanting actual electronical components, I've only seen charging via induction.
Induction requires a rather big area of wire spool, which makes the implants huge, also the power supply is very unstable and needs to be converted to DC, right?
Why not have two transdermal piercings (maybe even made of non-conductive material with a conductive core) and a DC power supply through these?
Why not have two transdermal piercings (maybe even made of non-conductive material with a conductive core) and a DC power supply through these?
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A well designed implant requires about 5 to 10mW while active, and driving an output electrode.
This thing is a home-made RFID tag (with LED as debug output) next to a AAA battery. And that's using DIP parts and the biggest coil I have around. I have plans for a device similar to this one, but with an output electrode.
The AC/DC conversion can be done with a simple rectifier circuit. If you have any kind of IC on your implant, you can even use the internal protection diodes like this guy did:
http://scanlime.org/2008/09/using-an-avr-as-an-rfid-tag/
it's a bit of a hack and isn't exactly within the circuit's specifications for strong fields, but it works. a proper circuit with filtering takes about 4 tiny additional parts, or 6, if you want a stable, regulated output (no need for digital circuits only).
So the reason why you've only seen inductive charging is, because it's simple, small, robust, easy to use, and the best thing we have at the moment.