基于OFDM的无线信号与电能反向同步传输方法  

Reverse Simultaneous Wireless Data/Power Transfer Method Based on OFDM

作　　者：靖永志[1,2,3] 鲁林海 冯伟 王森[1,3] 孙希聪 JING Yongzhi;LU Linhai;FENG Wei;WANG Sen;SUN Xicong(Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle,Ministry of Education,Chengdu 611756,China;Tangshan Research Institute,Southwest Jiaotong University,Tangshan 063000,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]磁浮技术与磁浮列车教育部重点实验室,成都611756 [2]西南交通大学唐山研究院,唐山063000 [3]西南交通大学电气工程学院,成都611756

出　　处：《电子与信息学报》2023年第8期2856-2866,共11页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(52077183)。

摘　　要：无线电能传输系统的稳定运行离不开信息传输技术的实现,该文针对无线信号与电能共享通道传输时存在耦合干扰及频谱利用率低的问题,提出一种基于正交频分复用技术(OFDM)的信号与电能反向同步传输新方法。该方法将电能载波等效为搭载全1信息的信号载波,采用OFDM技术实现信号的同步解耦与高速可靠传输时,即可减少电能传输过程对信号传输过程产生的串扰。电能通道采用串联谐振(S/LCC)补偿拓扑结构,使负载在一定范围内变化时输出电压稳定。松耦合变压器作为电能和信号传输的共同通道,可以同时、反向传输信号与电能两种不同频率的载波。首先介绍了系统的结构和OFDM基本原理;其次,对系统进行数学建模,分析研究信号与电能的传输特性;在此基础上,给出了信号调制与解调的设计方法。最后搭建电能传输功率为20 W、信号传输速率为85 kbit/s的实验平台,验证了所提方法的正确性。The stable operation of the wireless power transmission system is inseparable from the data transmission technology.In this paper,a new method based on Orthogonal Frequency Division Multiplexing(OFDM)technology is proposed to realize the reverse simultaneous transmission of data and power on account of the problems on coupling interference and low spectrum utilization in the shared channel transmission of data and power.The power carrier is equated as the data carrier loaded with all 1 information,data is decoupled synchronously and transmitted reliably at high speed by using OFDM technology and the crosstalk generated by the power transmission process to the data transmission process can be reduced in this method.In order to stabilize the output voltage when the load varies within a certain range,the Series LCC Circuit(S/LCC)compensation topology is adopted by the power transmission channel.As a shared channel for data and power transmission,loosely coupled transformer could simultaneously and reversely transmit two different frequency carriers of data and power.The structure of the system and the basic principle of OFDM are firstly introduced in this paper;Secondly,mathematical modeling of the system is carried out to analysis the transmission characteristics;and then the design methods of data modulation and demodulation are given;Finally,an experimental platform with 20 W power and 85 kbit/s data transmission has been built to verify the validation of the proposed method.

关 键 词：无线信号传输 正交频分复用 信号调制/解调 S/LCC补偿 

分 类 号：TN911.7[电子电信—通信与信息系统] TN86[电子电信—信息与通信工程]