Analysis of transmission characteristics of magnetically-coupled resonant wireless power transmission system
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摘要: 建立了磁耦合谐振式无线电能传输系统的电路模型，分析了传输功率、传输效率与输入频率、传输距离、负载之间的关系。仿真和实验结果表明：在不出现频率偏移的情况下，当系统输入频率与激励线圈回路的谐振频率相同时，传输功率和传输效率达到最大；随着传输距离的增大，传输功率先增大后减小，存在最佳的传输距离使得传输功率最大，而传输距离越小则传输效率越高；随着负载的增大，传输功率和传输效率先增大后减小，存在最佳的匹配负载使得传输功率和传输效率最大。Abstract: A circuit model of magnetically-coupled resonant wireless power transmission system was established, and relationships between transmission power, transmission efficiency and input frequency, transmission distance and load were analyzed. The simulation and experimental results show that transmission power and transmission efficiency achieve the maximum when input frequency of the system is the same as resonant frequency of excitation coil loop without frequency offset; transmission power increases then decreases with increase of transmission distance, and there is the optimum transmission distance to get the maximum transmission power, while transmission efficiency increases with decrease of transmission distance; transmission power and transmission efficiency increases then decreases with increase of load, and there is the optimum matched load to get the maximum transmission power and transmission efficiency.
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