线圈间距对谐振式无线电能传输系统性能的影响

针对线圈间距是衡量无线电能传输距离的关键指标,研究了线圈间距对谐振式无线电能传输系统性能的影响.建立了四线圈磁耦合谐振式无线电能传输系统模型和PCB平面螺旋线圈模型,通过Matlab仿真分析源线圈、发射线圈、接收线圈和负载线圈之间的距离对系统传输效率和输出电压的影响,并搭建实验平台对仿真结果进行了验证.结果表明,线圈间距对系统传输效率有显著影响,系统输出的负载电压随着发射线圈和接收线圈间距d23、源线圈和发射线圈间距d12的增大呈现先增大后减小的规律,选择合适的d23和d12可使系统输出电压达到最大值,而源线圈和发射线圈间距d34的增加则使得输出电压逐渐减小.因此,在系统设计中应尽可能使接收线圈和负载线圈靠近.

Influence of coil spacing on performance of resonant wireless power transmission system

For coil spacing is a key indicator to measure wireless power transfer distance, influence of coil spacing on performance of resonant wireless power transmission system was studied. A four-coil magnetically coupled resonant wireless power transmission system model and a PCB planar spiral coil model were established.The influence of the distance between source coil, transmitting coil, receiving coil and load coil on system transmission efficiency and output voltage were analyzed through Matlab simulation, and an experimental platform was built to verify the simulation results. The results show that the coil spacing has a significant effect on the transmission efficiency of the system. The load voltage output by the system presents a law of increasing first and then decreasing as the increase of spacing d23 between transmitting coil and receiving coil and the spacing d12 between the source coil and transmitting coil. Appropriate d23 and d12 can make the system output voltage reach the maximum value, and the increase of the distance d34 between the source coil and the transmitting coil makes the output voltage gradually decrease. Therefore, the receiving coil and load coil should be as close as possible in the system design.