电工技术学报  2024, Vol. 39 Issue (14): 4282-4293    DOI: 10.19595/j.cnki.1000-6753.tces.230764
电工理论 |
虚拟多输入多输出无线电能与信息同步传输技术
周岩, 刘志丹, 李烁涵
南京邮电大学自动化学院、人工智能学院 南京 210023
Virtual Multiple Input Multiple Output Simultaneous Wireless Power and Information Transfer Technology
Zhou Yan, Liu Zhidan, Li Shuohan
College of Automation & College of Artificial Intelligence Nanjing University of Posts and Telecommunications Nanjing 210023 China
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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。
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周岩
刘志丹
李烁涵
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    
Abstract: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 coefficient κ is 0.1. When κ is larger than 0.1, the larger κ results 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 the speed requirements of signals and wireless power transfer quality. The results show that the system can realize wireless power and information transmission under three communication modes. The deviated position between coils only affects power transmission.
The proposed circuit structure and the modulation strategy are simple and easy to realize. The modulation process has little impact on wireless power transfer quality. The weak coupling relationship between power supply and communication is achieved. The system shows good anti-disturbance under different working conditions and has good application prospects for multi-channel communication in wireless power transfer fields. The experimental results show that stable wireless power transfer with dual-channel information transmission is achieved, and the voltage fluctuation is less than 3% under a 4.0 kbit/s data rate.
Key wordsSimultaneous wireless power and information transmission    multiple input multiple output    phase-shift modulation    frequency-shift modulation   
收稿日期: 2023-05-25     
PACS: TM724  
基金资助:国家自然科学基金(51777098)和江苏省自然科学基金(BK20191383)资助项目
通讯作者: 周岩, 男,1980年生,教授,研究方向为无线电能传输、高频磁心损耗建模、包络线跟踪电源等。E-mail: zhouyan@njupt.edu.cn   
作者简介: 刘志丹, 男,2000年生,硕士研究生,研究方向为无线电能与信息同步传输。E-mail: liuzhidanaixx@163.com
引用本文:   
周岩, 刘志丹, 李烁涵. 虚拟多输入多输出无线电能与信息同步传输技术[J]. 电工技术学报, 2024, 39(14): 4282-4293. Zhou Yan, Liu Zhidan, Li Shuohan. Virtual Multiple Input Multiple Output Simultaneous Wireless Power and Information Transfer Technology. Transactions of China Electrotechnical Society, 2024, 39(14): 4282-4293.
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