Theoretical and Experimental Study on Resonant Frequency Drifting in Wireless Power Transfer

Wireless power transfer via magnetically coupled resonators is a new technology which energy can be transferred in the non-radiative near-field. Resonant frequency is critical and resonant frequency drift is the application barrier in wireless power transfer. This paper analyzes the effects about resonant frequency drifting mechanism. Thus, it reveals that the value of inductance and capacitance of coils changing is one of the main influencing factors. In order to make sure that disturbance effect the value of inductance and capacitance, which changes the resonant frequency, a prototype of 1Mhz-30Mhz wireless power transfer system was made. Experimental results verified the right of theoretical analysis.