Quote:
Originally Posted by some_other_dave
At what distance was that inductive coupling accomplished?
Almost everything that radiates drops off with the square of the distance, so unless your inductors are practically touching your efficiency starts getting poor rather quickly.
If you have to have the two parts basically touching, why not just have a plug at that point? It's cheaper, it's well-understood, and it's here right now.
-soD
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I was discussing coil to coil charging with my brother-in-law and he said high efficiency over a significant gap is technically possible, but requires higher frequencies and the coils and capacitors must be tuned to a set standard, IIRC.
Another reason to use coils, even if they have to be right next to each other, is that it reduces the risk of shock. Now I've never heard of someone being shocked by an EVSE or DC quick charger, but having high power, high voltage bare metal prongs outside where rain and other sources of conducting liquid could make a path through your body is still a risk.