Signal and Power Synchronous Transmission in WPT System Based on Capacitance Modulation

Liu, Xiaosheng; Gu, Xuanpu; Liu, Hao; Liu, Jiasheng; Xu, Dianguo

doi:10.1088/1757-899x/199/1/012132

Cited by 2 publications

(2 citation statements)

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“…In contrast to the communication methods that separate power and signal transmission channels, this method is less affected by the environment [10]. There are three main approaches to achieving signal transmission by shared channel method: carrier modulation, changing the reflected impedance and changing the compensation capacitance [11][12][13][14]. Signal transmission is coupled into the IWPT system through the utilization of four tightly-coupled transformers in [15].…”

Section: Introductionmentioning

confidence: 99%

“…Changing reflected impedance signal transmission is realized by detecting the current on the primary side. Reference [18] suggests that changing the compensation capacitance at the signal sending side could realize signal transmission by detecting the current at the signal receiving side under a constant load resistance, because the coil voltage envelopes the signal characteristics. Reference [19] discusses a scheme to solve the problem of variable loads, which needs to detect the load resistance before signal transmission begins.…”

Section: Introductionmentioning

confidence: 99%

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Synchronous power and signal transmission method for inductive wireless power transmission system by modifying compensation capacitance

Dou

et al. 2023

Preprint

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To synchronize the power forward transmission and signal reverse transmission of inductive wireless power transmission (IWPT) system, a signal reverse transmission method by modifying the compensation capacitance is proposed. Firstly, an equivalent circuit of signal reverse transmission circuit was established for the four basic compensation topologies of IWPT system, the relationship between the secondary-side compensation capacitance and the primary-side input impedance was analyzed. The analysis results indicate that the variable-capacitance method is more suitable for topology structures where the secondary coil and compensation capacitor are connected in series. Then, a variable-capacitance modulation method by detecting the phase angle of the input impedance of the primary side for series-series (SS) systems was proposed, and its impact on power transmission was analyzed. To improve the readability of the data at the receiving side, a data frame structure was designed. This structure is easy to identify the starting bit of the data, making it unnecessary for the signal demodulation at the receiving side to start working before the signal modulation at the sending side. Finally, the effectiveness of the method was verified by simulation and experiment. The results show that this method can successfully modulate and demodulate signals when the load and mutual inductance change. The data readability is improved, and the method has little impact on power transmission.

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