谐振耦合式无线电力传输系统matlab建模

1、Modeling Resonant Coupled Wireless Power Transfer System谐振耦合式无线电力传输系统建模This example shows how to create and analyze resonant coupling type wireless power transfer(WPT) system with emphasis on concepts such as resonant mode, coupling effect, and magnetic field pattern. The analysis is based on a 2-el

2、ement system of spiral resonators.这个例子显示了如何创建和分析谐振耦合式无线电力传输系统(WPT)的概念如谐振模式，强调耦合效应和磁场模式。 此分析是基于两螺旋谐振器系统。This example requires the following product: 这个例子需要以下产品：Partial Differential Equation Toolbox ?Design Frequency and System Parameters 设计频率和系统参数Choose the design frequency to be 30MHz. This is a pop

3、ular frequency for compact WPT system design. Also specify the frequency for broadband analysis, and the points in space to plot near fields.选择的设计频率为30MHz。这是便携式 WPT系统设计的一个流行的频率。还指定了宽带分析的频率，和在附近的空间中的点 。fc=30e6;fcmin = 28e6;fcmax = 31e6;fband1 = 27e6:1e6:fcmin;fband2 = fcmin:0.25e6:fcmax;fband3 = fcma

4、x:1e6:32e6;freq = unique(fband1 fband2 fband3); pt=linspace(-0.3,0.3,61);X,Y,Z=meshgrid(pt,0,pt); field_p=X(:);Y(:);Z(:);The Spiral Resonator 螺旋谐振器The spiral is a very popular geometry in resonant coupling type wireless power transfer system for its compact size and highly confined magnetic field. W

5、e will use such a spiral as the fundamental element in this example.螺旋是一种非常流行的几何形状在谐振耦合型无线功率传输系统，其紧凑的尺寸和高度密闭的磁场。我们会使用这样一个螺旋的基本元素在这个例子中。Create Spiral Geometry The spiral is defined by its inner and outer radius, and number of turns. Express the geometry by its boundary points, then import its boundar

6、y points into pdetool. The mesh is generated in pdetool and exported. The mesh is described by points and triangles. 创建螺旋几何形状的螺旋是由它的部和外部半径定义， 和数量的圈数。 由边界点的几何表达， 那么进口边界点为有效。网格产生有效和出口。网格是由点和三角形描述的。Rin=0.05;Rout=0.15;N=6.25;p,t=createSpiral(Rin,Rout,N); S O 赵 A = 4久卜如2*J X蚀Yi g忙rIDraiw 2-D pBomdryCreat

7、e custom antenna Use customAntennaMesh to import the mesh. The feed is created at the inner circle of the spiral mesh. This structure is now ready for analysis.创建自定义的天线，使用customAntennaMesh输入网格。反馈是在螺旋网格的圆上创建的。这种结构现在已经准备好进行分析。spiralobj=customAntennaMesh(p,t);spiralobj.Tilt=90;spiralobj.TiltAxis=Y;crea

8、teFeed(spiralobj,0.0525 0.0025,0.0675 0.0025);Reso nance Freque ncy and Mode谐振频率和模式It is important to find the resonant frequency of the designed spiral geometry. A good way to find the resonant frequency is to study the impedance of the spiral resonantor. Since the spiral is a magnetic resonator, a

9、 lorentz shaped reactance is expected and observed in the calculated impedance result.重要的是要找到所设计的螺旋几何的谐振频率。找到谐振频率的好方法是研究螺旋谐振器的阻抗。由于螺 旋是一个磁电磁谐振腔，洛伦兹形电抗预计和计算的阻抗结果观察。figure;impeda nce(spiralobj,freq);Since the spiral is a magnetic resonator, the dominant field component of this resonance is the magneti

10、c field. A strongly localized magnetic field is observed when the near field is plotted.由于螺旋是一个磁谐振器，这种共振的占主导地位的磁场分量是磁场。绘制近场时，观察到一个强局部磁场。figure;EHfields(spiralobj,fc,field_p, ViewField ,H，ScaleFields ,0 5);Create Spiral to Spiral Power Tran sfer System创建螺旋到螺旋动力传输系统The complete wireless power transfer

11、 system is composed of two parts: the transmitter(Tx) and receiver(Rx). Choose identical resonators for both transmitter and receiver to maximizethe transfer efficiency. Here, the wirelesspower transfer system is modeled as a lineararray.完整的无线电力传输系统是由两部分组成：发射机(Tx)和接收机(RX)。选择发射器和接收器的最大传输效率相同的谐振器效率。这里

12、的无线电能传输系统建模为一个线性阵列。wptsys=linearAiray( Element,spiralobj spiralobj); wptsys.Eleme ntSpaci ng=Rout*2;figure; show(wptsys);Variati on of System Efficie ncy with Tra nsfer Dista nee系统效率随传输距离的变化One way to evaluate the efficiency of the system is by studying the S21 parameter. As presented in 1, the syst

13、em efficiency changes rapidly with operating frequency and the coupling strength between the transmitter and receiver resonator. Peak efficiency occurs when the system is operating at its resonant frequency, and the two resonators are strongly coupled. The results for s-parameter analysis has been p

14、recomputed and stored in a MAT-file.评估系统的效率的一个方法是研究的S21参数。在1 中，系统的效率迅速变化与工作频率和耦合强度之间发射机和接收机谐振器。峰值效率发生时，该系统是在其谐振频率工作，和两个谐振器的强耦合。参数 分析结果已预先计算并存储在一个mat文件。load arraysparamfigure;rfplot(sparam,2,1, abs);Critical Coupled Point 临界耦合点The coupling between two spirals increases with decreasing distance betwee

15、n two resonators. This trend is approximately proportional to . Therefore, the system efficiency increases with shortertransfer distance till it reaches the critical coupled regime 1. When the two spirals are over coupled, exceeding the critical coupled threshold, system efficiency remains at its pe

16、ak, as shown in Fig.3 in1. We observe this critical coupling point and over coupling effect during modeling the system. Perform a parameteric study of the system s-parameters as a function of the transfer distance.双螺旋线的增加与减少之间的距离两谐振器之间的耦合。这种趋势是近似成正比。因此，系统效率随shortertransfer距离直到它达到临界耦合机制1 。当两螺线是耦合的，超过

17、临界耦合阈值，系统效率保持在峰值，如图3所示的1 。我们观察到这个关键的耦合点和超耦合效应建模过程中的系统。执行系统 的S参数，一个参数化的研究的一个转移 距离函数。The transfer distance is varied by changing the ElementSpacing. It is varied from half of spiral dimension to one and half times of the spiral dimension, which is twice of the spirals outer radius. The frequency range

18、 is expanded and set from 25 MHz to 36 MH z.传输距离是通过改变elementspacing 变化。它是从螺旋尺寸的一半变化到一个和半倍的螺旋尺寸，这是螺旋的外半径的两倍。他的频率围扩大，并设置从 25兆赫至36兆赫。freq=(25:0.1:36)*1e6;dist=Rout*2*(0.5:0.1:1.5); load(wptData.mat);s21_dist=zeros(le ngth(dist),le ngth(freq); for i=1:le ngth(dist) s21_dist(i,:)=rfparam(sparam_dist(i),2

19、,1); endfigure;X,Y=meshgrid(freq/1e6,dist); surf(X,Y,abs(s21_dist), EdgeColor，none);view(150,20);shad in g(gca, in terp);axis tight;xlabel(Frequency MHz); ylabel(Distanee m); zlabel(S_21 Magnitude);Coupli ng Mode betwee n Two Spiral Reson ator双螺旋谐振腔的耦合模The dominant energy exchange mechanism between

20、the two spiral resonators is through the magnetic field. Strong magnetic fields are present between the two spirals at the resonant frequency.两个螺旋谐振器之间的占主导地位的能量交换机制是通过磁场。强磁场存在于两个在谐振频率螺旋。wptsys.Eleme ntSpaci ng=Rout*2;figure;EHfields(wptsys,fc,field_p, ViewField ,H ,ScaleFields ,0 5);view(0,0);Con cl

21、usi onThe results obtained for the wireless power transfer system match well with the results published in 1.所获得的无线功率传输系统的结果相匹配，以及与在1 发表的结果。（见下文）Refere nces1 A. P. Sample, D. T. Meyer, and J. R. Smith, Analysis, Experimental Results, and Range Adaptation of Magnetically Coupled Resonators for Wirels

22、s Power Transfer, IEEE Transations on Industrial Electronics, pp.544-554, 58, 2, 2011.1 A. P. Sample，D. T. Meyer，J. R. Smith，”分析，实验结果，和无线电力传输的“磁耦合谐振器系列 改编，IEEE工业电子交易电子、 pp.544-554，58，2，2011。Magn etically coupled res onant structures offer a unique set of ben efits as well as desig n challe nges whe

23、n used for wireless power tran sfer. One of the remarkable results is the existenee of the magic regime , where efficie ncy rema ins n early con sta nt over dista nee, as long as the receiver is within the operating range of the transmitter. This is not the case for conven tio nal far-field and n ea

24、r-field wireless power systems, whose efficienciesdecline sharply with range. The work in this paper providesa deeper un dersta nding of the un derly ing prin ciples of coupled magn etic resonan ce, as well as a simple circuit model of the system. A derivatio n of the tran sfer fun ctio n of this mo

25、del reveals which con cepts play a critical role in system performanee: frequency splitting, operating range, and impeda nee matchi ng. In order to accurately characterize the wireless power system, measureme nt tech niq ues that use a n etwork an alyzer for circuit parameter extract ion have bee n

26、impleme nted. Excelle nt agreeme nt betwee n the circuit model and measureme nts has bee n dem on strated, with a coefficie nt of determ in ati on of 0.9875. Lastly, the issue of receiver alignment sensitivity is addressed with an adaptive tuning algorithm. We dem on strate that for any receiver pos

27、iti onan d/ororie ntati on,afreque ncy can be ide ntified that maximizes power tran sfer efficie ncy.Additi on ally, a track ing algorithm allows for the peak efficie ncy to be maintained as the receiver is moved in space.磁耦合的谐振结构提供了一个独特的好处，以及设计的挑战时，用于无线功率传输。其中一个显著的结果就是“魔术”的存在政权，在那里效率保持几乎恒定的 距离，只要接收

28、器是在发射机的工作围。这不是传统的远场和近场的情况下无线 电力系统，其效率急剧下降的围。本文的工作提供了一个更深入的了解耦合磁共 振的基本原则，以及系统的一个简单的电路模型。这个模型的传递函数的推导揭示了概念在系统性能中起着至关重要的作用：频率分裂，工作围，和I阻抗匹配。为了准确地描述的无线电力系统，测量技术，使用网络分析仪的电路参数提取已 实施。优秀的电路模型和测量之间的协议已被证明，与一个系数的测定0.9875。最后，接收器对准灵敏度的问题是解决与一个适应调整算法。我们表明，对于任何接收器的位置和/或方向，可以确定一个频率，最大限度地提高功率传输效率。 此外，跟踪算法允许当接收机在空间移动

29、时保持峰值效率。One compell ing usage sce nario is a workspace where devices such as laptops, cells pho nes, and USB peripherals are seamlessly powered and recharged as easily as data is tran smitted through the air. As a final dem on stratio n of the pote ntial of this type of wireless power system,Fig.15 shows a laptop being con ti nu ously powered via the magn etically coupled res on ators. Here the laptop battery has bee n removed and the wireless power system is provid ing all the power n eeded for operati on. The signal generator, amplifier, and directional coupler can be