基于OFDM的无线信号与电能反向同步传输方法

靖永志; 鲁林海; 冯伟; 王森; 孙希聪

doi:10.11999/JEIT220929

基于OFDM的无线信号与电能反向同步传输方法

doi: 10.11999/JEIT220929

靖永志^{1, 2, 3, ,},
鲁林海^{1, 2},
冯伟^{1, 3},
王森^{1, 3},
孙希聪^{1, 3}

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

基金项目: 国家自然科学基金(52077183)

详细信息

作者简介:
靖永志：男，博士，副研究员，研究方向为无线信号与电能传输、信号处理与检测技术等

鲁林海：男，硕士生，研究方向为无线信号与电能传输等

冯伟：男，硕士生，研究方向为无线信号与电能传输等

王森：男，硕士生，研究方向为无线信号与电能传输等

孙希聪：男，硕士生，研究方向为无线信号与电能传输等

通讯作者:
靖永志　jingyongzhi@swjtu.edu.cn

中图分类号: TN911.7; TN86
计量
- 文章访问数: 423
- HTML全文浏览量: 333
- PDF下载量: 56
- 被引次数: 0
出版历程
- 收稿日期: 2022-07-07
- 修回日期: 2022-11-10
- 录用日期: 2022-12-20
- 网络出版日期: 2022-12-22
- 刊出日期: 2023-08-21

Reverse Simultaneous Wireless Data / Power Transfer Method Based on OFDM

JING Yongzhi^{1, 2, 3
, ,},
LU Linhai^{1, 2},
FENG Wei^{1, 3},
WANG Sen^{1, 3},
SUN Xicong^{1, 3}

1.
Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle, Ministry of Education, Chengdu 611756, China
2.
Tangshan Research Institute, Southwest Jiaotong University, Tangshan 063000, China
3.
School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China

Funds: The National Natural Science Foundation of China (52077183)

摘要

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。
- 无线信号传输 /
- 正交频分复用 /
- 信号调制/解调 /
- S/LCC补偿
Abstract: 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.
- Wireless data transmission /
- Orthogonal Frequency Division Multiplexing (OFDM) /
- Data modulation/demodulation /
- Series LCC Circuit (S/LCC) resonance

HTML全文

图 1 系统结构

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图 2 FDM与OFDM频谱分布

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图 3 OFDM子载波频谱图

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图 4 信号与电能反向同步传输系统电路

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图 5 电能传输回路等效电路

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图 6 信号传输回路等效电路

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图 7 载波传输模型

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图 8 系统调制原理

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图 9 系统解调原理

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图 10 信号与电能同步传输系统实验平台

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图 11 不同负载时的输出电压

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图 12 电压波形对比

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图 13 信号解调过程波形

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表 1 实验参数

参数	数值	参数	数值
线圈内径(cm)	2	L₁, L₂(μH)	29
线圈外径(cm)	5.5	M(μH)	15
线圈间隙(cm)	1	C₁(nF)	88
R_L(Ω)	28.8	C₂(nF)	140
C_f(nF)	233	C₄, C₅(nF)	22
L_f(μH)	15	R_D(kΩ)	1
L₅, L₆(μH)	10	f_p(kHz)	85
L₃, L₄(μH)	10	fs( kHz)	340

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表 2 性能比较

参数	本文	文献[26]	文献[27]	文献[1]	文献[4]
电能传输功率(W)	20	20	20	86.4	0.126
信号传输速率(bit/s)	85k	10M	15M	80k	1M
调制/解调方式	OFDM	OFDM	OFDM	FSK	FSK
电能载波频率(kHz)	85	44.09	43.83	82	–
信号载波频率(kHz)	340	2000～28000	2000～28000	4000～6000	2000～4000
子载波间隔(kHz)	85	–	–	2000	2000
电能-信号载波频率间隔(kHz)	255	1956	1956	3918	–
频带利用率(bit/(s·Hz))	1	0.38	0.58	0.04	0.5
信道数	1	>>1	>>1	2	2

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