Selection of high transfer stability and optimal power-efficiency tradeoff with respect to distance region for undergrou
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ORIGINAL ARTICLE
Selection of high transfer stability and optimal power‑efficiency tradeoff with respect to distance region for underground wireless power transfer systems Yu Xu1 · Qili Chen2 · Detian Tian1 · Yongquan Zhang3 · Bo Li1 · Huiming Tang3 Received: 8 May 2020 / Revised: 6 September 2020 / Accepted: 8 September 2020 / Published online: 23 September 2020 © The Korean Institute of Power Electronics 2020
Abstract Magnetic resonant wireless power transfer (MR-WPT) has become a significant method for powering the measurement units in landslide monitoring boreholes. This paper focuses on the effects of quality factor, coupling distance and load on the power transfer stability, sensitivity and performance of an MR-WPT system. Firstly, through a numerical model of an MR-WPT, the effect of quality factor and coupling distance on the output power, transfer efficiency and frequency splitting phenomenon of MR-WPT systems have been comparatively analyzed. The relationship between the load and the coupling distance region corresponding to optimal transfer performance has been studied. Results show that improving the quality factor of the coils is beneficial for the transfer performance and stability of WPT system. Furthermore, through the selection of the load, a coupling distance region with high transfer stability and an optimal tradeoff between power and efficiency can be obtained. Finally, the above theoretical simulation results have been verified by experimental results. Keywords Magnetic resonant wireless power transfer · Landslide monitoring · Tradeoff · Load resistance · Optimal coupling distance
1 Introduction With the development of science and technology, the Internet of Things is being widely used in our daily lives [1–3]. Meanwhile, the explosion of wireless technologies associated with the Internet of Things has led to an increasing demand for alternative methods of powering wireless devices [4]. To avoid regular battery replacements and charging with sockets [5], wireless power transfer (WPT), as a breakthrough technology for the charging of electronic devices, has attracted a great deal of attention since the first WPT experiment by Tesla at the beginning of the twentieth century [6]. In the future, WPT will be used in charging * Bo Li [email protected] 1
School of Mechanical and Electronic Information, China University of Geosciences, Wuhan, China
2
School of Mathematics and Physics, China University of Geosciences, Wuhan, China
3
Faculty of Engineering, China University of Geosciences, Wuhan, China
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electric vehicles (EV), biomedical implant devices, portable consumer electronic products, and equipment in the field of geosciences [7]. Although wireless charging technology has been used commercially in some low-power electronic devices with a short coupling distance, WPT technology for electronic devices with a medium coupling distance is still in the experimental research stage [1, 8, 9]. Compared with inductive wireless power transfer (IPT) and microwave wireles
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