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 fp and the signal receiving loop with resonant frequency fp/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 fp . Since the frequency of fundamental component of the current is also fp 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 fp/3. The fundamental component of fp/3 is used to transmit information, and the third harmonic frequency fp is used to transfer wireless power. So the carrier frequency for communications is fp/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.
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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