基于移相调制的无线供电与信息协同传输技术

doi:10.19595/j.cnki.1000-6753.tces.220736

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摘要

该文提出一种基于移相调制的无线供电与信息协同传输技术。通过控制全桥逆变器的频率和移相角,将工作状态分为两种工作状态：当系统仅需要无线供电时,移相全桥逆变器的工作频率等于系统一次和二次线圈谐振频率f_p,实现无线电能的高效率传输;当系统需要同时进行无线供电与信号传输时,移相全桥逆变器控制频率采用f_p/3作为低频通信频率,通过调制移相角实现信号传输,利用其3次谐波频率f_p进行高效率无线电能传输。理论上通信时所选择的工作相位点仅影响基波频率点幅值分量以实现解码,而对实现无线供电谐波频率点幅值没有影响。该技术采用二次侧双谐振回路构造能量接收电路和信号解调电路,可在同一套硬件装置上实现信道复用,实现低频通信信号的传输和无线电能的高效率传输,在海洋等对通信频率敏感的介质条件下具有明显优势。

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关键词 ：无线供电与信息协同传输, 相位控制, 移相全桥逆变器, 通信载波

Abstract：

In order to meet the requirements of power and communication in equipment, the simultaneous wireless power and information transmission (SWPIT) technology has developed rapidly in recent years. This method can greatly enhanced the abilities of mobility and intelligence for modern electronic devices, especially for implantable medical devices, autonomous navigation equipment, and etc. There are many SWPIT solutions for different applications, and different solutions have their owns advantages, such as communication speed and capacity, the effect of communication on wireless power transfer. However, for the medium with high conductivity or dielectric constant, we need to find a suitable SWPIT solution with low carrier frequency to reduce the channel power losses.
This paper proposes the dual-resonant loops in the receiver side, which are the wireless power receiving loop with resonant frequency f_p and the signal receiving loop with resonant frequency f_p/3 respectively. In the transmitter side, a full bridge converter is used to produce a triangular current in a transmitter coil, and the frequency of the current is controlled by driving signals. Based on the frequency and phase-shifted control, the proposed full bridge inverter contains two states mainly.
First state, if the system needs to transfer wireless power only, the working frequency of the inverter is f_p . Since the frequency of fundamental component of the current is also f_p and equal to the resonance frequency in the receiver coil, the system has the highest efficiency and power transfer ability. The energy received by the signal loop can be treated as zero.
Second state, if the system needs to transfer wireless power and information simultaneously, the frequency of the inverter is f_p/3. The fundamental component of f_p/3 is used to transmit information, and the third harmonic frequency f_p is used to transfer wireless power. So the carrier frequency for communications is f_p/3. Compared with the first state, the power in the third harmonic component is relatively small. Based on the analysis of the proposed method, the phase angles of 0 and 120 are used to modulate the fundamental component. By modulating the phase-shifted angle, the amplitude in the receiving signal loop has a larger value at the angle of 0 than that at the angle of 120. Theoretically, the selected phase angles only affect the amplitude of the fundamental component, and have no effect on the 3th harmonic component. Therefore, the effect of communication on the fluctuation of wireless power transfer is relatively small. The shortcoming is the ability of wireless power transfer is only 1/3 part of full power.
The proposed method can realize SWPIT based on the full bridge inverter only. Based on the proposed topology and circuit parameters, the working features of the system under different conditions are discussed. The interference between power transfer and signal transmission is modeled, and the ranges of phase-shifted and the parameters in the signal detection circuit are determined. Since the working frequency of the inverter has a low-frequency carrier for communication, the proposed method has obvious advantages for the high conductivity medium, such as the ocean.

Key words： Simultaneous wireless power and information transmission phase-shifted control full bridge inverter

收稿日期: 2022-05-04

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,高频磁心损耗建模,包络线跟踪电源等。E-mail：zhouyan@njupt.edu.cn

作者简介: 华超男,1998年生,硕士,研究方向为无线电能与信息协同传输技术。E-mail：1336577381@qq.com

引用本文:

华超, 周岩, 胡震, 朱建鑫. 基于移相调制的无线供电与信息协同传输技术[J]. 电工技术学报, 0, (): 17-17. Hua Chao, Zhou Yan, Hu Zhen, Zhu Jianxin. Simultaneous Wireless Power and Information Transmission Method Based on Phase-Shifted Modulation. Transactions of China Electrotechnical Society, 0, (): 17-17.

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