Efficiency of Power Transfer
One of the key issues in wireless charging is efficiency of power transfer. You want to have as much power reach the device as possible, rather than getting lost in the air on the way.
The Powermat Model
Powermat is a system a lot of us are familiar with, but it requires a special mat, a special phone case, and it still needs a cord.
Wireless Power Consortium
The Wireless Power Consortium has created a standard for charging technology with the hope of greater interchangeability between devices following their “Qi” (pronounced “chee”) standard.
The Alliance for Wireless Power
Another organization working in the wireless power realm is The Alliance for Wireless Power, which counts Powermat, Samsung, and Qualcomm as members.