【作者】 张青；

【导师】 张波； 丘东元；

【作者基本信息】 华南理工大学 ， 电力电子与电力传动， 2011， 硕士

【摘要】 2007年MIT学者首次提出谐振耦合式无线输电,它不同于感应式无线输电和微波无线输电。该方法利用电磁共振的原理将能量从发射端传输到接收端,能量不会像微波式无线输电一样辐射到空中,而是从损耗最低的路径传输大部分能量被负载所吸收,因此传输效率得到大幅度提高。无线输电方式较之于传统接触式输电方式有很多的优势,如无线输电可以给现代生活带来方便,可以避免一些工业场合的铜线裸露问题,可以用于一些特殊场合需穿过电源端和负载端之间的障碍物而省去导线。目前,谐振耦合式无线输电的研究大多都集中在对单个接收负载的效率和功率的改善上面。对两个接收负载的研究,只考虑了两个接收端互不影响的情况,并未考虑两个接收端之间的相互影响。因此,本文针对多个接收负载的情况,对发射端和接收端不同位置,并考虑接收端之间的相互影响,做了理论分析和实验验证。本文的主要研究内容如下:(1)对单负载的谐振耦合式无线输电系统进行原理分析及系统建模,分析得到谐振、频率、距离、负载对系统的输出功率和效率都有较大影响;(2)对多负载谐振耦合式无线输电系统特性进行分析,得出系统输出功率和效率的计算公式,进而分析了两个接收负载不在同一侧、在同侧重叠和不重叠三种情况下的系统特性,由此获得以下结论:当两负载回路有较大互感系数时,负载回路的最大的输出功率和效率并非在谐振点处;当两负载回路之间互感系数较小时,在满足一定条件下负载回路的最大的输出功率和效率出现在谐振点处;(3)设计了带两个负载的谐振耦合式无线输电系统,通过实验验证了理论推导的多载特性的正确性。最后,利用磁场暴露测试仪对系统进行磁场暴露测试和分析,分析结果为磁场辐射到空中的能量较小,低于危害人体的最低磁场暴露标准。更多还原

【Abstract】 Magnetic Resonant Power Transfer was brought forward by MIT in 2007. It is different from Inductive Power Transfer and Microwave Power Transmission. Resonance is applied in the wireless power transfer, so that the energy does not radiate to the air but be absorbed by the receiving circuit like a short circuit in the air. Compared with traditional power transfer, the wireless power transfer has many superiorities, for example it can take many comfort to modern living, prevent transferring wire from being naked, and pass through obstacles between the source and the the load in some special situation.Now, research on Magnetic Resonant Power Transfer is improving the power and efficiency of wireless power transfer system mainly. On researching Magnetic Resonant Power Transfer to two receivers, the effect of the two recievers was unconsidered. So this article will consider the different conditions of whether there is influence between the receivers.This article includes the following works:(1) Analytical model of Magnetic Resonant Power Transfer to one receiver is established. The factor which can affect the efficiency and output power of the system, such as resonance, frequency, disctance and load, are discussed , and it’s found that the resonance is the most important factor.(2)Analytical model of Magnetic Resonant Power Transfer to multiple receivers is established. The computational formulas of the power and efficiency with two receivers are obtained. Three conditions, which is two receivers are on the opposite sides of the transmitter, on the same sides overlapping and unoverlapping, are discussed. And then it’s concluded that when the mutual inductance between the recievers is high, the power and efficiency of wireless power transfer is not the maximum as the receiving circuits are resonant, and when the mutual inductance between the recievers is low, the power and efficiency of wireless power transfer is the maximum as the receiving circuits are resonant under some conditions.(3)A system of Magnetic Resonant Power Transfer to multiple receivers is made, and the characteristic of the system with two receivers is verified. The exposure of electromagnetic fields of the wireless power system will be tested by analysor, the result is that the exposure of electromagnetic fields is lower than the standard.更多还原