I'm trying to get a feel for the pertinent issues that would drive the design of a wireless power coupler.
[I state it as a "wireless power coupler" and not a "charger" even though there will be a storage device on the "far side"; but, the item essentially remains in situ semi-permanently (the wireless aspect simply to *allow* it to be temporarily moved, as required; it is almost always *used* while in the charging position)]Coil diameter is practically limited to something less than
6 inches. Gap between coils would be O(1-2 inches). Alignment/placement of devices won't be well constrained; there won't be a closely-fitting mechanical guide that ensures "ideal" alignment.Efficiency wrt thermal issues is a concern; a few degrees C is about all I could tolerate above ambient.
So, how do I go about ball-parking the sorts of available power I can move across the gap "on average". I.e., I'm trying to get a feel for my power budget on both sides of the air gap. And, which parameters give me the biggest bang-for-the-buck (e.g., getting the coils closer seems to be the biggest improvement)
[Any numbers on charge times -- from which power transfer rates could be extrapolated -- for wireless *phone* chargers? Noting, of course, that they are a far more favorable physical arrangement]