无线电能传输效率优化

Efficiency optimization for a wireless power transfer system

基于无线电能传输系统模型,通过系统一次侧和二次侧的电压回路方程及引入的系统一次侧和二次侧频率漂移因子,给出了电源输入侧的系统阻抗表达式及系统总电能传输效率表达式。针对系统频率漂移影响电能传输效率的问题,设计了一种系统电能传输效率的优化方案。在系统负载范围内,计算出了系统的最优谐振频率及不同负载水平下的最佳电能传输效率。系统频率漂移时,通过调节相关参数使系统工作在最优电能传输效率状态。系统仿真结果表明,系统频率漂移时,根据本文提出的方法能够有效提升电能传输效率。

Based on the wireless power transfer system model, branch voltage functions of the primary side and thesecondary side are deduced. Via defining factors of frequency drift for the primary side and the secondary side, thepower transfer efficiency and the equivalent put-in impedance are derived. The optimization power transferefficiency is derived in view of operation frequency drifting. With the proposed methodology, the optimizationtransfer efficiency and the full tuned frequency of different load level are deduced. While the operation frequencydrifting, by adjusting system parameters, the power transfer efficiency is promoted. The efficiency of the proposedmethodology is confirmed via simulation.