摘要
为了提高磁耦合共振系统的能量传输效率,通过研究系统无线能量传输特性,探索了系统传输效率随耦合距离变化的规律。基于二端口网络分析方法,建立了磁耦合共振无线能量传输的等效电路模型,求解出共振系统发生频率分叉现象产生的条件以及最大效率时的频率表达式。通过数值仿真对共振系统传输特性进行了分析,揭示了系统的固有共振频率会随着耦合距离的增加,由两个相差较远的共振频率逐渐靠近,直至跨越临界条件,汇聚为一个共振频率的规律。实验结果与理论分析吻合,所建理论模型能够准确描述整个共振系统的能量传输特性。结论可为优化磁耦合共振无线能量传输系统工作效率提供理论依据。
In order to improve energy transmission efficiency of wireless power system based on magnetic resonant coupling,the relationship between transmission efficiency and coupling distance is researched studying the transmission characteristics of wireless power system. The equivalent circuit model of wireless power transmission system via magnetic resonance coupling is analyzed contactless based on the two-port network analysis method. The condition of the resonant frequency splitting phe-nomenon is produced, a contactless power transmission system is deduced, and the frequency expression of maximum efficiency is derived. The transmission characteristics of this system are researched using numerical simulation. The law that two quite different resonant frequencies turn into one until the critical condition is revealed and resonant frequency is increased gradually with the coupling distance under the condition of optimum efficiency. Experimental results show that the transmission characteristics are consistent with theoretical analysis and simulation. The model can＆amp;nbsp;describe the transmission characteristics of the power transmission system accurately, and provide theoretical support for the magnetic resonant coupling system.
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2014年第1期118-122,共5页
Journal of Nanjing University of Science and Technology
基金
国家自然科学基金(61104185)
关键词
磁耦合共振
无线能量传输
共振频率
频率分叉
magnetic resonant coupling
wireless power transmission
resonance frequency
frequency splitting
