The influence of the distance between the transmitter and the receiver of a wireless power system on the coupling factor and the voltage induced

The wireless power transfer systems are very often used to charge high-tech devices nowadays. To obtain a high performances wireless system it must be properly designed in order to have a power transfer from the emitter to the receiver as higher as possible taking into consideration all the specifications and parameters of the devices for which it is construct. This paper presents a way to optimize a wireless inductive power transfer system for the charging device. The physical limitations of the application require that the coils and electronic circuit be in optimal shape to maximize the output power delivered to the load and the power transmission efficiency of the wireless power system. The paper also includes numerical results for different working distances between the coils, ranging from 1 mm to 20 mm, and explores the response of the system at different frequencies.