磁共振无线电能传输系统功率与效率综合优化

Power and Efficiency Comprehensive Optimization of Wireless Power Transfer via Magnetic Resonance

针对磁共振耦合无线电能传输系统中峰值功率与峰值效率工作频率点往往不重合,不可同时最优传输问题,利用互感耦合理论对无线电能传输系统进行建模分析,推导出功率与效率计算的数学表达式,阐明了系统获得峰值传输功率和峰值传输效率的各自条件,发现负载是影响两者频率分布的主要因素。在此基础上,提出匹配因子的概念,指出通过调整用电端负载等效阻抗,可使系统传输功率峰值点和传输效率峰值点的频率相互靠近,从而获得综合性能最优的传输性能。最后,搭建了实验系统,实验测试结果证明了理论分析结论的正确性。

In order to solve the problems that the operating frequency points of peak power and peak efficiency in wireless power transmission system and magnetic resonance coupling are often not coincident,and the transmission cannot be optimized at the same time,the mutual inductance coupling theory is used to model and analyze the wireless power transmission system,and the mathematical expression of power and efficiency is derived.The respective conditions for peak power and peak efficiency are clarified.It is found that the load is the main factor affecting the frequency distribution.The concept of matching factor is presented,and it is pointed out that the frequency of the peak power and peak efficiency can be close to each other by impedance matching,so as to obtain the optimal transmission performance.Finally,the experimental platform is set up and the theoretical analysis conclusion is proved by the experimental results.