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| Simultaneous Transmission Method of Wireless Power and Signals Based on Integral Demodulation |
| Jing Yongzhi1,2, Fu Kang1,3, Qiao Ke1,2, Yang Liangtao1,3, Liu Qinyu1,2 |
1. Key Laboratory of Maglev Technology and Maglev Train Ministry of Education Chengdu 611756 China;
2. School of Electrical Engineering Southwest Jiaotong University Chengdu 611756 China;
3. Tangshan Graduate School Southwest Jiaotong University Tangshan 063000 China |
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Abstract Compared with traditional wired transmission, wireless power transfer (WPT) technology does not require physical contact to complete the transmission of electrical energy with power supply flexibility, safety, and reliability, which has been widely used in consumer electronics, smart homes, and other fields. In practical applications, real-time signal transmission is also required to complete the control instructions and upload feedback signals to enhance the overall performance of the system.
Simultaneous wireless power and data transfer (SWPDT) technology can be realized using RF technology, multi-coupled channel technology and single-coupled channel technology, and single-coupled channel technology. It does not need complex pairing, and has high flexibility, small size, and wide applications. Single-coupled channel technology can be divided into two categories according to the signal transmission mode: energy modulation and high-frequency carrier modulation. The frequency of the energy carrier limits the signal transmission rate of energy modulation, affecting the stability of the energy during transmission. In contrast, high-frequency carrier modulation can achieve a higher signal transmission rate with simple control and low power loss.
The channel bandwidth of the SWPDT system with a single coupling channel is limited, posing challenges for efficient power transmission due to interference between energy and signal channels. The analog circuit demodulation mode is difficult to extract envelope information, resulting in underutilization of bandwidth and increased susceptibility to interference. Therefore, this paper proposes a wireless energy and signal synchronous transmission method based on integral demodulation, which has a higher frequency band utilization rate and signal transmission rate. The energy interference carrier can be suppressed. Compared with the traditional analog circuit demodulation method, it does not need complex envelope detection and filter circuits, demonstrating robust anti-interference ability.
The system proposed in this paper adopts a bilateral LCC compensation topology in the energy transmission channel, which can stabilize the output current when the load changes within a certain range. By modeling the equivalent circuit of the signal transmission channel and analyzing the transfer function, the parameters of the signal channel are optimized to make full use of the signal channel bandwidth. The amplitude-shift keying principle is used at the signal transmission end to modulate the signal and inject it into the energy transmission channel using the series connection of the transformer. In the signal receiving end, the carrier and coherent carrier mixing are received by the integral demodulation method, sent to the integrator for integration, and the original data is restored. The integration period and the code element cycle maintain consistency.
The experimental results show that the proposed SWPDT system maintains the constant-current output characteristics. The low-frequency energy interference carrier is suppressed after mixing and integrating the sampled data. The integration results of the piggyback “0” and “1” signals have obvious differences. The original data can be effectively recovered, and a signal transmission rate of 1.2 Mbit/s is achieved under a 3.2 MHz signal carrier frequency, which has a relatively high bandwidth utilization rate.
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Received: 30 May 2023
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2024, Vol. 39 
