Aiming at the problems of relatively low transmission efficiency

high cost

and complex structure existing in the multi-stage power conversion structure used in the inductive wireless power transfer system

a matrix converter was used to replace the traditional multi-stage power conversion structure

and a modulation strategy based on a three-phase to single-phase matrix converter was proposed to achieve direct AC-AC power conversion. The three-phase power frequency alternating current on the grid side undergoes power modulation by the matrix converter to realize the switching between the energy injection state and the free oscillation state

and directly output a high-frequency controllable current. The matrix converter has a total of twelve working modes. Based on the modulation strategy

the resonant current was adjusted. There is no need for intermediate energy storage elements

and the number of switch operations was reduced

enabling the power switching tubes to operate in the zero current switching(ZCS)state

thus improving reliability and efficiency of the converter. An experimental model was constructed for simulation analysis

and an experimental platform was built to verify feasibility of the control strategy. The experimental results show that the proposed control strategy directly converts the 50 Hz power frequency alternating current into a 20 kHz high-frequency alternating current. The output power of the matrix converter is 51.3 W

and the conversion efficiency is 92.9%. The modulation strategy used is simple and convenient for practical applications.