Abstract: In order to hold the output voltage constant, stabilize system frequency when the load varies dynamically in inductive coupled power transfer(ICPT) system, this paper presents a double LCL resonant ICPT system (LCL resonant tank in both and pickup side). Firstly, this paper describes the stable voltage characteristics of ICPT system based on LCL resonant circuit in pickup side., presented the two design methods of the primary coin considered the reflected impedance in ICPT system based on LCL resonant circuit is capacitance-resistance, and the capacitive portion is unrelated to load dynamic variation. At the same time, describes the constant current characteristics of ICPT system based on LCL resonant circuit in primary side. Then, a general conditions is given under the conditions of load dynamic variation, which is effective to realize constant frequency (operating frequency is constant), constant current and stable voltage output. Besides, the influence of major performance parameters on the output characteristic is analyzed. Finally, the viability of the proposed system is verified by simulation and experiments, and the results suggest that the double LCL resonant ICPT system based on optimal parameters realizes the characteristics of constant frequency, constant current and stable voltage.
