Analysis of misalignments in efficiency of mid-range magnetic resonance wireless power link

Safety considerations of wireless charger for electric vehicles — A review paper

“…In the recent 2012 IEEE Antenna and Propagation Symposium, a session named "Wireless Power Transfer" is organized and many designs of the transfer system were presented for different applications [23]- [33]. The reports [23]- [29] focus on investigation and improvement of the power transfer efficiency. It is noted that these reports may be applicable to any wireless power transfer application including electrical vehicles, because most of them are general discussion on how to improve the efficiency of the WPT system.…”

“…Thus, the multi-loop can act as several different feeding loops and can be reconfigured for impedance matching at a certain distance. In [29], analysis of misalignment effects between resonators in efficiency of midrange wireless power transmission is presented, and some interesting phenomena of the nullification of the power transfer regarding the misalignments have been experimentally discovered. In [30] [31], the near fields were discussed for the WPT system.…”

Car Park Charger Using Witricity

“…As such, this will affect the efficiency of the power transfer. However, there are also concerns that misalignment can distort the field in a way that would allow the field to stretch or extend into an adjacent zone [5] . For example, the user cannot be located under the vehicle during charging, but can be located in next to or within the vehicle.…”