The compensation type can directly affect the gain characteristics of output current and voltage in the wireless power transfer(WPT). A hybrid compensation topology circuit is proposed to solve the problem of unstable current or voltage output with dynamic load. It can be applied to the constant current and constant voltage wireless charging circuit of electric vehicles. An equivalent loosely coupled transformer T model for the former subsidiary side coil is developed. It is concluded by analysis that the wireless power transfer circuit in dynamic load can realize the characteristics of constant-current and constant-voltage output. Finally

a simulation model is built and the test bench is set up to verify the correctness of the theoretical analysis of the system. It is shown by experiment that a stable current output is achieved at the secondary side and the AC output current at the primary side of the inverter lags behind the output voltage waveform under the series/parallel connection compensation topology; a stable voltage output is achieved at the secondary side and the phase of AC output current and output voltage of the inverter at the primary side is zero in series/series-parallel connection compensation topology. This work is supported by National Natural Science Foundation of China(No. 51277150)and Key Industry Project of Shaanxi Province(No. 2013K07-05).