用准静态谐振腔实现自由空间无线电能传输

Freedom spatial wireless power transmission using quasi-static resonant cavity

为了使运动工作和随意摆放的设备得到高效利用,从而不断提高人们生活品质和生产效率,人们迫切希望能够以无线方式为这些设备提供电力,而不是依赖导线连接电源或者停下工作来充电。据此,利用准静态谐振腔原理,初步研究了在特定三维空间内,为静止或运动设备无线供电的技术。根据准静态谐振腔结构和电磁场分布特点,给出了准静态谐振腔电磁场各坐标分量的直观近似表达式。在此基础上,分析了接收线圈的感应电动势和腔体的功率损耗,以及传输效率的一般表达式。制作了2.08×2.08×1.12 m^(3)的立方体且带一对电极的准静态谐振腔,并针对接收线圈的自转和公转等运动,开展了传输功率与传输效率的实验研究和相同条件下的仿真研究,实现了在手持且运动状态下为手机无线充电的功能。

In order to make efficient use of moving working equipment and randomly-placed equipment,thereby improving people’s life quality and production efficiency,people are hoping to provide power to these equipment wirelessly,rather than relying on wires to connect to a power source or stop working to charge.The principle of quasi-static resonant cavity was used to preliminarily study the technology of wirelessly powering stationary or moving working equipment in a specific three-dimensional space.According to the quasi-static resonant cavity structure and electromagnetic field distribution,the intuitive approximate expressions of the various coordinate components of the quasi-static resonant cavity electromagnetic field were given.On this basis,the induced electromotive force of the receiving coil,the power loss of the cavity,and the general expression of the transmission efficiency were analyzed.A cubic quasi-static resonant cavity with a size of 2.08×2.08×1.12 m^(3) and a pair of electrode was fabricated,and experimental research on transmission power and transmission efficiency and simulation research under the same conditions were carried out for the rotation and revolution of the receiving coil.It realizes the function of wireless charging for mobile phones in the hand-held and moving state.