Research on a compensate topology of primary side based on parallel T-Type structure for wireless power transfer

For a wireless power transfer system, when the transmission distance is long, the power is low in the case of low coupling coefficient. In order to solve this problem, a new compensate topology of primary side based on parallel T-type structure is proposed. The circuit structure and impedance characteristics of the system are analyzed, the compensation circuit can be used to make the primary side be equivalent to series resonant structure with a proportionally amplified Q value. The expression of the output voltage in the proposed structure, is deduced and compared with traditional series resonant structure. Simulation and experimental data show that compared with series-series structure, the proposed topology can increase transmission power as the coupling coefficient changes, and is more suitable for long distance power transmission.