Plates vs. Coils – An alternative approach to wireless power transmission

> Q: What is the relative efficiency of the two systems? > A: I don’t really care for this proof of concept.

Looks like he'll have a ton of fun after this proof of concept...

From the last issue of The Economist (Edited by me):

"..a company called Wibotic that plans to recharge drones (and also earthbound robots) without them having to establish an awkward physical connection with a plug.... LaserMotive, another Seattle-based company, .. is developing a system designed to replenish the batteries of drones that are still aloft, using lasers and photovoltaic cells..

Wibotic’s answer is to use tuned electrical circuits in place of simple transmitting and receiving coils. When such circuits are tuned to the same resonan"t frequency, they exchange energy more efficiently. That permits power to be transferred over distances up to the diameter of the coils, or even slightly farther."

Reference : http://www.economist.com/news/science-and-technology/2165613...

>Note that we only need one LED for the inductive coil since there is a loop though the coils, so the electrons can keep going around and around in the same direction and never get trapped. Nonsense. The current in the secondary coil is caused the changing the magnetic field. This cannot keep changing indefinitely in the same direction so the current in the primary that generates the magnetic field must be alternating and then so will the current in the secondary.