Abstract: Wireless power transfer system based on nonlinear parity-time-symmetry is a robust system which can maintain high efficiency at a certain distance.Current systems use operational amplifiers to balance gain and loss,resulting in low transmission power.To solve this problem,a method of using switching devices as nonlinear saturation gain components was proposed.Full bridge,half bridge and class E power amplifier circuits were used to construct parity-time-symmetric wireless power transfer system.The circuit model was established and analyzed by coupling mode theory.Finally,the effectiveness and feasibility of the proposed method were proved by simulation.

Key words: nonlinear parity-time-symmetry, wireless power transfer, switching devices, coupling mode theory