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.
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.
[1] 贾金亮, 闫晓强. 磁耦合谐振式无线电能传输特性研究动态[J]. 电工技术学报, 2020, 35(20): 4217-4231. Jia Jinliang, Yan Xiaoqiang.Research tends of magnetic coupling resonant wireless power transfer characteristics[J]. Transactions of China Electro-technical Society, 2020, 35(20): 4217-4231. [2] 薛明, 杨庆新, 章鹏程, 等. 无线电能传输技术应用研究现状与关键问题[J]. 电工技术学报, 2021, 36(8): 1547-1568. Xue Ming, Yang Qingxin, Zhang Pengcheng, et al.Application status and key issues of wireless power transmission technology[J]. Transactions of China Electrotechnical Society, 2021, 36(8): 1547-1568. [3] 于宙, 肖文勋, 张波, 等. 电场耦合式无线电能传输技术的发展现状[J]. 电工技术学报, 2022, 37(5): 1051-1069. Yu Zhou, Xiao Wenxun, Zhang Bo, et al.Development status of electric-field coupled wireless power transmission technology[J]. Transactions of China Electrotechnical Society, 2022, 37(5): 1051-1069. [4] 张献, 邢子瑶, 薛明, 等. 无线电能传输系统异物检测技术研究综述[J]. 电工技术学报, 2022, 37(4): 793-807. Zhang Xian, Xing Ziyao, Xue Ming, et al.Overview of foreign object detection in wireless power transfer system[J]. Transactions of China Electrotechnical Society, 2022, 37(4): 793-807. [5] 杨庆新, 张献, 章鹏程. 电动车智慧无线电能传输云网[J]. 电工技术学报, 2023, 38(1): 1-12. Yang Qingxin, Zhang Xian, Zhang Pengcheng.Intelligent wireless power transmission cloud network for electric vehicles[J]. Transactions of China Electrotechnical Society, 2023, 38(1): 1-12. [6] Varshney L R.Transporting information and energy simultaneously[C]//2008 IEEE International Sym-posium on Information Theory, Toronto, ON, Canada, 2008: 1612-1616. [7] He Xiangning, Wang Ruichi, Wu Jiande, et al.Nature of power electronics and integration of power conversion with communication for talkative power[J]. Nature Communications, 2020, 11: 2479. [8] 李建国, 张波, 荣超. 近场磁耦合无线电能与信息同步传输技术的发展(上篇): 数字调制[J]. 电工技术学报, 2022, 37(14): 3487-3501. Li Jianguo, Zhang Bo, Rong Chao.An overview of simultaneous wireless power and information transfer via near-field magnetic links(part Ⅰ): digital modu-lation[J]. Transactions of China Electrotechnical Society, 2022, 37(14): 3487-3501. [9] 夏晨阳, 任思源, 陈锐, 等. 基波—谐波双通路并行感应式能量与信号同步传输技术[J]. 电力系统自动化, 2018, 42(5): 169-175. Xia Chenyang, Ren Siyuan, Chen Rui, et al.Inductive power and signal synchronous transmission based on parallel paths of fundamental wave and harmonic wave[J]. Automation of Electric Power Systems, 2018, 42(5): 169-175. [10] Li Xiaofei, Hu Jiefeng, Li Yong, et al.A decoupled power and data-parallel transmission method with four-quadrant misalignment tolerance for wireless power transfer systems[J]. IEEE Transactions on Power Electronics, 2019, 34(12): 11531-11535. [11] Trautmann M, Sanftl B, Weigel R, et al.Simultaneous inductive power and data transmission system for smart applications[J]. IEEE Circuits and Systems Magazine, 2019, 19(3): 23-33. [12] Wu Jiande, Zhao Chongwen, Lin Zhengyu, et al.Wireless power and data transfer via a common inductive link using frequency division multiple-xing[J]. IEEE Transactions on Industrial Electronics, 2015, 62(12): 7810-7820. [13] 唐春森, 邓棚亓, 李亚超, 等. 基于部分能量线圈和OFDM技术的ICPT系统高速数据传输方法[J]. 电源学报, 2019, 17(4): 80-86. Tang Chunsen, Deng Pengqi, Li Yachao, et al.High-speed data transmission method for ICPT system based on partial energy coil and OFDM technology[J]. Journal of Power Supply, 2019, 17(4): 80-86. [14] 聂志强, 王世练, 邓恬. 基于OFDM的水下短距离超宽带电磁波通信方法[J]. 舰船电子工程, 2017, 37(8): 70-74, 114. Nie Zhiqiang, Wang Shilian, Deng Tian.A method of short distance and ultra-wideband underwater electromagnetic communication based on OFDM[J]. Ship Electronic Engineering, 2017, 37(8): 70-74, 114. [15] 张宁. 基于耦合线圈复用的ICPT系统能量信号分时传输技术[D]. 重庆: 重庆大学, 2015. [16] Yan Zhou, Xiang Zhu, Wu Lin, et al.Study of wireless power and information transmission tech-nology based on the triangular current waveform[J]. IEEE Transactions on Power Electronics, 2018, 33(2): 1368-1377. [17] Zhou Yan, Lin Wu, Wang Baoyun.High-efficiency coupling-insensitive wireless power and information transmission based on the phase-shifted control[J]. IEEE Transactions on Power Electronics, 2018, 33(9): 7821-7831. [18] Xia Chenyang, Jia Renhai, Shi Yuntong, et al.Simultaneous wireless power and information transfer based on phase-shift modulation in ICPT system[J]. IEEE Transactions on Energy Conversion, 2021, 36(2): 629-639. [19] Yan Zhou, Ma Chongyuan, Zhang Zijian, et al.Redefining the channel bandwidth for simultaneous wireless power and information transfer[J]. IEEE Transactions on Industrial Electronics, 2022, 69(7): 6881-6891. [20] Cai Hua, Shi Liming, Li Yaohua.Harmonic-based phase-shifted control of inductively coupled power transfer[J]. IEEE Transactions on Power Electronics, 2014, 29(2): 594-602. [21] 刘洋. ICPT系统中信号双向传输机理研究[D]. 重庆: 重庆大学, 2013.
2024, Vol. 39 
