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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Abstract In order to meet the requirements of power and communication in equipment, simultaneous wireless power and information transmission (SWPIT) technology has developed rapidly in recent years. This method can greatly enhance the abilities of mobility and intelligence for modern electronic devices, especially for implantable medical devices and autonomous navigation equipment. There are many SWPIT solutions for different applications, and different solutions have their advantages, such as communication speed and capacity, and the effect of communication on wireless power transfer. However, for the medium with high conductivity or dielectric constant, a suitable SWPIT solution with low carrier frequency is necessary to reduce the channel power losses.
This paper proposes the dual-resonant loops on the receiver side: the wireless power receiving loop with resonant frequency f_p and the signal receiving loop with resonant frequency f_p/3, respectively. On the transmitter side, a full bridge converter is used to produce a triangular current in a transmitter coil, and the current frequency is controlled by driving signals. Based on the frequency and phase-shifted control, the proposed full bridge inverter mainly contains two states.
First state, if the system needs to transfer wireless power only, the working frequency of the inverter is f_p. Since the frequency of the 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. Thus, the carrier frequency for communications is f_p/3. The power in the third harmonic component is relatively small compared to the first state. 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 without affecting the 3rd harmonic component. Therefore, the effect of communication on the fluctuation of wireless power transfer is relatively small. The shortcoming is that wireless power transfer is only 1/3 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 modulation frequency control full bridge inverter

Received: 04 May 2022

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	Hua Chao
	Zhou Yan
	Hu Zhen
	Zhu Jianxin

Cite this article:

Hua Chao,Zhou Yan,Hu Zhen等. Simultaneous Wireless Power and Information Transmission Method Based on Phase-Shifted Modulation[J]. Transactions of China Electrotechnical Society, 2023, 38(16): 4233-4245.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.220736 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I16/4233

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