基于宇称时间对称的P-SP拓扑无线电能传输系统特性分析OA北大核心CSTPCD

The parity time(PT)symmetry principle has been proved to be a powerful tool to improve the degree of freedom of wireless power transfer(WPT)systems.However,the operating range of the P-P(parallel-parallel)topology WPT system based on the PT symmetry principle is still limited.To solve this problem,a P-SP(series-parallel)compensated WPT system based on PT symmetry principle is proposed.The circuit model of the system is simplified by the equivalent circuit method,and the influence of the capacitance distribution ratio on the oscillation frequency,the critical coupling coefficient,the coupling coefficient satisfying the system entering the PT symmetric region,the load resistance range and the transmission efficiency is analyzed by the coupled mode theory.A prototype is built to carry out experiments to test the applicability of the proposed method.The results show that the transmission distance can be expanded from 110 mm to 210 mm with only 2%loss of system transmission efficiency.Hence,preparations are made to expand the application scope,increase application scenarios,and optimize the working performance of the sending and receiving module units in the laser wireless charging system.