虚拟多输入多输出无线电能与信息同步传输技术  

Virtual Multiple Input Multiple Output Simultaneous Wireless Power and Information Transfer Technology

作　　者：周岩 刘志丹 李烁涵 Zhou Yan;Liu Zhidan;Li Shuohan(College of Automation&College of Artificial Intelligence Nanjing University of Posts and Telecommunications Nanjing 210023,China)

机构地区：[1]南京邮电大学自动化学院、人工智能学院,南京210023

出　　处：《电工技术学报》2024年第14期4282-4293,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51777098);江苏省自然科学基金(BK20191383)资助项目。

摘　　要：在无线通信系统中,多输入多输出(MIMO)天线技术可有效提高信号传输速率和信道利用率。传统的能量调制式无线电能与信息同步传输(SWPIT)技术主要依赖单输入单输出线圈实现系统的供电和通信,难以实现多路并行通信。该文针对需要多信号接收器的无线供电场景,提出一种虚拟MIMO-SWPIT技术以满足多端通信的需求。所提系统可在两种状态下工作:当仅需无线供电时,系统工作在谐振状态进行高效电能传输;当需要通信时,通过控制逆变器开关信号的相移角和频率,在发射线圈中构造非标准正弦多载波(即虚拟多输入),以其中的基波和谐波分量作为通信载波传输信息。系统接收回路对基波和谐波所携带的信息进行解调(即虚拟多输出),同时谐波分量可用于负载供电。搭建的实验样机实现了稳定的电能与双通道信息并行同步传输,通信时电压波动低于3%,每路通道信息传输速率为4.0 kbit/s,验证了所提方案的可行性。Most devices need wireless power function and regular communication in wireless power transfer applications,such as autonomous guide vehicles and implantable medical devices.Multiple input multiple output(MIMO)antenna technology is widely used to enhance wireless communication speed and channel capacity.The traditional energy modulation method relies on a single pair of coils to realize the power transfer and communication,which makes parallel communications hard to achieve.This paper proposes a virtual MIMO-SWPIT technology to meet multi-terminal communication requirements in the wireless power transfer system.The proposed system has two working styles.When wireless power transfer is required only,the system works under the resonant state with the highest efficiency and power transfer ability.When the system needs wireless power and communication transfer simultaneously,the phase-shift angle and the frequency in inverters are modulated to a specific waveform in the transmitting coil.The fundamental and harmonic components in the specific waveform are used as the multi-carrier to transmit information.The receiving side demodulates the information contained in the fundamental and harmonic components,and the harmonic components are used to power the load.A full bridge inverter is built with the series-series compensation for wireless power transfer on both sides.The power transmission characteristics are analyzed under the two styles.Under the given working conditions,the effect of the coupling coefficient on the transmitting current is shown in both the time domain and frequency domain.Theoretically,power transfer capability achieves the maximum value when the coupling coefficientκis 0.1.Whenκis larger than 0.1,the largerκresults in smaller power transfer capability and larger power efficiency.Three communication modes are the phase shift modulation,the frequency modulation,and the combination of the phase shift and frequency modulation.The phase shift angle range and frequency deviation are analyzed based on t

关 键 词：无线电能与信息同步传输 多输入多输出 移相调制 移频调制 

分 类 号：TM724[电气工程—电力系统及自动化]