Magnetic coupling resonant wireless power transmission system based on variable coil structure
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摘要: 针对传统单一线圈结构的磁耦合谐振式无线电能传输系统存在传输效率受限于传输距离的问题，设计了一种变线圈结构的磁耦合谐振式无线电能传输系统。建立了系统的等效电路模型；分析了系统分别采用两线圈结构和四线圈结构时的传输效率与传输距离之间的关系；根据两线圈结构时系统传输效率随着传输距离的增大而逐渐减小、四线圈结构时系统传输效率随着传输距离的增大先增后减的结论，提出了传输距离小于线圈半径时采用两线圈结构、传输距离大于线圈半径时采用四线圈结构的变线圈结构谐振耦合方式，以实现不同传输距离时传输效率的最大化。仿真和实验结果验证了该系统的有效性和可行性。Abstract: For problem that transmission efficiency of traditional magnetic coupling resonant wireless power transmission system based on single coil structure was limited by transmission distance, a magnetic coupling resonant wireless power transmission system based on variable coil structure was designed. An equivalent circuit model of the system was built, relationship between transmission efficiency and transmission distance were analyzed when the system adopted two-coil and four-coil respectively, and conclusions were gotten as follows: transmission efficiency of the system with two-coil structure decreased with increase of transmission distance, and transmission efficiency of the system with four-coil structure increased first and then decreased with increase of transmission distance. According to above conclusions, a coupling resonant mode using variable coil structure was proposed, which adopted two-coil structure when transmission distance was smaller than coil radius and four-coil structure when transmission distance was larger than coil radius, so as to realize the maximization of transmission efficiency under different transmission distances. The simulation and experimental results verify effectiveness and validity of the system.
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