近场板在无线电能传输系统中的应用

Near-field plate applied in wireless power transmission system

为解决无线电能传输过程中电能随距离增加而大量损耗及其周围电磁波对人体产生辐射等问题,利用近场板对电磁波的汇聚作用提高无线电能传输系统的性能,减少电磁波对周围环境的辐射,针对一种典型的近场板结构进行优化设计.主要根据无线电能传输系统的要求,对近场板的结构及具体尺寸进行分析,得到其对电磁波聚焦特性达到最优效果的结构,并将优化所得近场板结构放入无线电能传输系统中,对整个系统进行仿真.分析结果表明:加入近场板的系统中,在距发射线圈相同的位置上,磁场强度在垂直于发射线圈的方向明显增强,偏离垂直方向的磁场强度则有所下降.仿真实验证明在相同条件下,加入近场板的系统中,接收线圈的电流明显增强.

In the wireless power transmission system, the energy dissipation increased with the distance and the electromagnetic waves in the surrounding caused radiation to the human body. In order to solve these problems, the near-field plate which can focus the electromagnetic waves was used to improve the performance of wireless power transmission system and reduce the electromagnetic radiation on the surrounding environment. A typical structure of near-field plate is ana- lyzed according to the requirements of the wireless power transmission system, thus the optimal structure of the near-field plate is obtained. In addition, the optimized near-field plate structure is put into the wireless power transmission system, and the whole system is simulated. The analysis results indicate that the magnetic field strength is obviously enhanced in the direction of the axis after the near-field plate is placed in the system, while the magnetic field strength is decreased in the other direction. The simulation results show that the current of the receiving coil is obviously enhanced compared with the wireless power transmission system without near-field plate.