【作者】 邓红梅；

【导师】 向乾尹；

【作者基本信息】 西南交通大学 ， 通信工程（专业学位）， 2023， 硕士

【摘要】 近年来随着磁耦合无线充电的快速发展,目前已被广泛应用在家电设备、移动终端、电动汽车、水下安全监测、地下探测等各个领域。其摆脱了传统有线输电的弊端,例如因插座老化而产生的电火花造成的安全隐患问题、有线模式造成对原材料的浪费问题等等,其诸多有线电缆无法比拟的优点吸引了诸多国内外研究人员兴趣。然而在面对一些特殊的实际应用场景例如强磁场环境、水陆空天的装备领域,存在着复杂的主次侧控制、状态监控、闭环反馈控制、无线显示等无线通信需求,需要提供不受环境影响、保密性好、安全稳定、双向传输的通信条件,以保证系统的正常工作与稳定,实现无线供电场景下的高速率无线数据传输。同时,复杂动态应用环境的不可抗因素造成线圈耦合间距变化导致通信链路恶化以及实际供电场景下的电磁兼容设计、灵活抗干扰需求,应亟需构建适应耦合系数变化及通带可重构的磁耦合通信通道的动态调控机制。但现阶段对于磁耦合通信链路的动态调控方法还缺乏深入研究,这些问题将限制磁耦合无线供电应用场景下的磁耦合数据通信的应用。本文主要研究内容分为两个部分:首先,提出了用于同时无线数据和能量传输(SWIPT)系统的高隔离度滤波天线一体化通信结构设计,详细介绍了空域解耦原理以及线圈天线关键参数计算。采用共口径模式的独立耦合DD线圈,基于滤波器理论,完成了二阶耦合滤波馈电网络的协同设计,并进一步设计了无线供电系统(WPT)工作频点的LC带阻滤波器来抑制WPT谐波干扰,搭建了硬件实验平台。测试结果表明,传能模块输入48V,输出12V/1.2A,工作频点167k Hz处提升了85dB的抑制能力,验证了其具备通信条件。在中心频率14.8MHz处有4MHz的-3dB带宽和良好的阻抗匹配特性。其次提出了一种适应耦合系数变化及满足通信频带重构需求的选用DD型耦合线圈并加载可调元件的新型可调谐磁通信耦合结构,探究了固定耦合系数下的动态调控机制,设计了一具有可调谐通带和阻抗匹配功能的π型可调匹配网络,实现滤波线圈天线一体化耦合结构。并进一步了设计了频域带阻滤波器,以增强对WPT泄漏信号的抑制。该可调谐磁通信耦合结构的天线直径为10cm,典型耦合距离为30mm,采用商用WPT模块构建了SWIPT系统并进行了制造与测试,验证了所提出方案的可调性。测量表明,当WPT功率在0W～25W范围内,耦合距离从30mm增加到40mm时,可调谐阻抗匹配,回波损耗优于20dB,中心频率可以从33MHz调谐到45MHz,-3dB带宽为2.5MHz～3MHz,磁耦合通道插入损耗小于6dB。更多还原

【Abstract】 In recent years,with the rapid development of magnetic coupled wireless charging,it has been widely used in household appliances,mobile terminals,electric vehicles,underwater safety monitoring,underground detection and other fields.It gets rid of the drawbacks of traditional wired power transmission,such as the potential safety problems caused by the electrical spark caused by the aging of the socket,the waste of raw materials caused by the wired mode,and so on.Its many incomparable advantages of wired cables attract the interest of many researchers at home and abroad.However,in the face of some special practical application scenarios such as strong magnetic field environment,water,land,air and space equipment field,there are complex requirements for wireless communication such as primary and secondary control,status monitoring,closed-loop feedback control,wireless display,etc.,it is necessary to provide communication conditions that are not affected by the environment,good confidentiality,safe and stable,and two-way transmission,so as to ensure the normal operation and stability of the system.Implements high-speed wireless data transmission in the scenario of wireless power supply.At the same time,the irresistible factors of complex dynamic application environment lead to communication link deterioration due to the change of coil coupling distance and the requirements of electromagnetic compatibility design and flexible anti-interference in the actual power supply scenario.Therefore,it is urgent to construct a dynamic regulation mechanism of magnetic coupling communication channel that ADAPTS to the change of coupling coefficient and reconfigurable passband.However,at present,there is a lack of in-depth research on the dynamic control methods of magnetic coupled communication links.These problems will limit the application of magnetic coupled data communication in the application of magnetic coupled wireless power supply.The main research content of this paper is divided into two parts:Firstly,a filtering antenna integrated communication structure design for simultaneous wireless data and energy transfer(SWIPT)systems was proposed.The spatial decoupling principle and key parameter calculation of the coil antenna were introduced in detail.Using a common aperture mode DD coil,based on filter theory,a collaborative design of a secondorder coupled filtering feed network was completed,And further designed an LC bandstop filter at the working frequency point of Wireless Power Transmission(WPT)to suppress WPT harmonic interference.A hardware experimental platform was built,and the test results showed that the energy transmission module had an input of 48 V and an output of 12V/1.2A.The suppression ability was improved by 85 dB at the working frequency point of 167 k Hz,verifying its communication conditions.There is a-3dB bandwidth of 4MHz and good impedance matching characteristics at the center frequency of 14.8MHz.Secondly,a novel tunable magnetic communication coupling structure with DD coupling coil and adjustable elements is proposed to adapt to the coupling coefficient changes and meet the communication frequency band reconstruction requirements.The magnetic coupling control mechanism of resonators is explored,and a π-type tunable matching network with tunable passband and impedance matching functions is designed to realize the integrated coupling structure of filtering coil and antenna.A band stop filter in frequency domain is designed to enhance the suppression of WPT leakage signal.The diameter of the tunable magnetic communication coupling structure is 10 cm,and the typical coupling distance is30 mm.The SWIPT system is constructed by using a commercial WPT module,and the tunability of the proposed scheme is verified by manufacturing and testing.The measurement shows that when the WPT power is in the range of 0W～25W and the coupling distance increases from 30 mm to 40 mm,the tunable impedance matches,the return loss is better than20 dB,the center frequency can be tuned from 33 MHz to 45 MHz,the bandwidth of-3dB is2.5MHz～3MHz,and the magnetic coupling channel insertion loss is less than 6dB.更多还原