磁耦合谐振式无线电能传输系统在过耦合区域传输效率分析

Transmission efficiency analysis for magnetic coupled resonance wireless power transfer system in over-coupled region

该文研究了磁耦合谐振式无线电能传输(MCR-WPT)系统在过耦合区域对等同谐振回路和非等同谐振回路的可实现传输效率。利用等效电路理论建立了MCR-WPT系统的电路模型。通过等效参数与频率、耦合系数的函数关系,分析了频率分裂现象,并推导出频率分裂的闭合方程和等同谐振回路在过耦合区域的传输效率。通过设计环状线圈及相关实验,验证了分析结果与实验结果的一致性。通过数学证明发现,即使在等同谐振回路内出现频率分裂,也可保持传输效率为1个恒定值。研究结果表明,等同谐振回路在MCR-WPT系统过耦合区域可实现高稳定性能。

The transmission efficiency of a magnetic coupled resonance wireless power transfer( MCR-WPT )system for identical and non-identical resonators in over-coupled region is discussed. A circuit model of the MCR-WPT system is established by using the equivalent circuit theory. The frequency splitting phenomenon is analyzed by the functional relationship between equivalent parameter ,frequency and coupling coefficient,and a closed equation of frequency splitting and the transmission efficiency of the equivalent resonant circuit in over-coupled region are derived. The consistency between the analysis results and the experimental results is verified by designing a loop coil and related experiments. Mathematical proof shows that the transmission efficiency can be constant even if frequency splitting occurs in a resonant circuit with identical resonators. The research results show that the resonant circuit with identical resonators can achieve high stability performance in the over-coupling region of MCR-WPT system.