Constant-current output LCC wireless power transfer circuit

In this paper, a LCC-WPT behaving as a current source in certain condition and its optimization design method was investigated. The formula of output current has been deduced from wave base analysis, and efficiency optimization of resonance network has been designed. The analysis shows that the resonant frequency is irrespective of the load changing, and under the condition of the resonant frequency, the circuit has the characteristics of current source. At last, a 70w power rating prototype has been produced. The results have proved the constant-current feature of circuit and the 91% efficiency of prototype.