The Effects of Monolayer Planar Coil Turns Change in Low-Frequency Wireless Power Transfer

The structure of coil in wireless power transfer affects the transmission performance. When a fixed excitation source is matched with appropriate transmitting and receiving coils, the electromagnetic energy can be fully utilized. In order to study the lightweight requirements on special occasions, the relationship between coil turns and receiving performance must be investigated. This paper designs and uses the simplest structure of monolayer planar coils which winded closely by ordinary copper enameled wire and fixed in 25 mm inner diameter, 0.5 mm strand diameter. According to modeling and simulation, the coil parameters and mutual inductance are obtained after the transmitting and receiving coils turns changed respectively, the simulation results are also verified by experiments. Finally, based on experiments, the variation empirical model of receiver voltage is concluded, which can provides a prediction model for the wireless charging power control of lightweight equipment.