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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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

Received: 25 December 2022

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TM724

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	Zhou Yan
	Liu Zhidan
	Li Shuohan

Cite this article:

Zhou Yan,Liu Zhidan,Li Shuohan. Virtual Multiple Input Multiple Output Simultaneous Wireless Power and Information Transfer Technology[J]. Transactions of China Electrotechnical Society, 0, (): 9028-28.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.230764 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/9028

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