虚拟MIMO无线电能与信息同步传输技术

doi:10.19595/j.cnki.1000-6753.tces.230764

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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供电和通信,难以实现多路并行通信。本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4.0kbps,验证了所提方案的可行性。

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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：

To the application of wireless power transfer, such as autonomous guide vehicles and implantable medical devices, most of equipments need the function of wireless power and communication normally. Multiple input multiple output (MIMO) antenna technology is widely used in the field of wireless communication to enhance communication speed and channel capacity. To simultaneous wireless power and information transmission (SWPIT) technology, the traditional energy modulation method relies on a single pair of coils to realize the power transfer and communication, so it hard to achieve parallel communications. In this paper, a virtual MIMO-SWPIT technology is proposed, and this method can meet the needs of multi-terminal communications 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 to wireless power and communicate transfer simultaneously, the phase-shift angle and the frequency in inverters are modulated to build a specified waveform in the transmitting coil. The fundamental component and the harmonic components in the specified waveform are used as the multi-carrier to transmit information respectively. The receiving side demodulates the information containing in the fundamental and harmonic components, and the harmonic components are used to power the load at the same time. In order to demonstrate the proposed method, a full bridge inverter is built with the series - series compensation for wireless power transfer in 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 currents is shown in both time domain and frequency domain. Theoretically, power transfer capability achieves maximum values when the coupling coefficient κ is 0.1 in this case. When κ is larger than 0.1, the larger κ results smaller power transfer capability and larger power efficiency. Three communication modes are the phase shift modulation, the frequency modulation and the compound of the phase shift modulation and the frequency modulation. Based on the requirements of the speed of signal and the quality of wireless power transfer, the ranges of phase shift angle and the deviations of frequency are analyzed respectively. The results show that the system can realize wireless power and information transmission under three communication modes. The deviated position between coils only affects the power transmission but less affects the quality of communication. The circuit structure and the modulation strategy in this paper are relatively simple and easy to realize. The process of modulation has tiny impact on the quality of wireless power transfer. The weak coupling relationship between power supply and communication has achieved. The system also shows good anti-disturbance under different working conditions and has a good application prospect for needing multi-channel communication in the wireless power transfer field. The experimental results show that the stable wireless power transfer with dual-channel information transmission can be achieved, the voltage fluctuation is less than 3% under the 4.0kbps data rate. This shows the feasibility of the proposed method.

Key words： Simultaneous wireless power and information transmission multiple input multiple output phase-shift modulation frequency-shift modulation

收稿日期: 2022-12-25

PACS:

TM724

基金资助:

国家自然科学基金项目(51777098)和江苏省自然科学基金项目(BK20191383)资助

通讯作者: 周岩, 男,1980年生,教授,研究方向为无线电能传输,高频磁芯损耗建模,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MIMO无线电能与信息同步传输技术[J]. 电工技术学报, 0, (): 9028-28. Zhou Yan, Liu Zhidan, Li Shuohan. Virtual Multiple Input Multiple Output Simultaneous Wireless Power and Information Transfer Technology. Transactions of China Electrotechnical Society, 0, (): 9028-28.

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