线圈距离可变的无线电能传输系统研究

Research on Nariable Coil Distance in Wireless Power Transmission

在无线电能传输(WPT)系统中线圈之间的距离是影响输出功率的一个重要因素。针对特定场合中线圈距离可变时仍要保持一定输出功率的需求,此处基于串串(SS)型补偿拓扑对线圈距离与输出功率的关系进行了研究。首先对电路拓扑建立数学模型,利用Matlab软件拟合并分析了线圈距离与互感的关系,通过互感将线圈距离与输出功率两者进行联系并分析,得出了当线圈距离变化时输出功率的变化情况,并基于此说明提升初级电压对增大线圈距离可变范围的可行性。最后搭建了实验装置,通过实验结果与理论分析曲线的对比验证了理论分析结果的正确性。

The distance between the coils in a wireless power transmission(WPT) system is an important factor affecting the output power.In view of the need to maintain a certain output power when the coil distance is variable in a specific occasion,the relationship between the coil distance and its output power based on the SS topology is studied.Firstly,the mathematical model is established for the circuit structure.The relationship between the coil distance and the mutual inductance is fitted and analyzed by Matlab software.The relationship between the coil distance and the output power is analyzed by mutual inductance,and the change of output power when the coil distance changes is obtained.The situation and based on this description,the feasibility of increasing the primary side voltage to increase the variable range of the coil distance.Finally,the experimental device is built.The correctness of the theoretical analysis results is verified by comparing the experimental results with the theoretical analysis curves.