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Modeling and analysis of wireless power transmission system via strongly coupled magnetic resonances

机译：通过强耦合磁共振对无线电力传输系统进行建模和分析

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摘要

There exist some issues in wireless transmission like low efficiency, short transmission distance and so on. The transmission distance of traditional inductive wireless transmission system is in mm level. For electromagnetic radiant wireless transmission system is transmitted through radiation, the transmission efficiency is very low. The majority of research on wireless power transmission system is based on the traditional coupled magnetic model, which ignores the characteristics of resonance coils under different working frequency. Thus, the resonance frequency obtained isn't able to make the system working with high efficiency. Based on the transmission characteristics of wireless power transmission, this paper establishes the magnetic coupling resonance model, then analyzes and calculates the optimal transmission frequency of wireless transmission system based on coupled-mode theory and resonance theory, namely the work frequency of strong coupling resonance in the system. By using the finite element analysis method, the paper makes experimental verification on the calculated resonant frequency through the CST electromagnetic simulation software, analyzes the transfer characteristics of the system under different load conditions, and the experimental results show that the calculated resonant frequency can make the system work in a high-efficient and strong coupling transmission state. In the last part, the essay conducts certain analysis on the reasons leading to inaccuracy and proposed some methods to reduce residuals. The experiment set up the hardware system of magnetic coupling resonant wireless power transmission, which light the 4 watts LED lamp in the distance of 12cm, and made the wireless transmission of power realized.
机译：无线传输中存在效率低，传输距离短等问题。传统感应无线传输系统的传输距离以毫米为单位。对于电磁辐射的无线传输系统，通过辐射进行传输，传输效率非常低。对无线电力传输系统的研究大多基于传统的耦合磁模型，该模型忽略了不同工作频率下谐振线圈的特性。因此，获得的共振频率不能使系统高效工作。根据无线电力传输的传输特性，建立了磁耦合共振模型，然后基于耦合模式理论和共振理论，分析并计算了无线传输系统的最佳传输频率，即强耦合共振的工作频率。系统。利用有限元分析方法，通过CST电磁仿真软件对计算出的谐振频率进行了实验验证，分析了系统在不同负载条件下的传递特性，实验结果表明，计算出的谐振频率可以使系统获得较好的谐振频率。系统工作在高效，强耦合的传输状态。在最后一部分，本文对导致误差的原因进行了一定的分析，并提出了减少残差的一些方法。实验建立了磁耦合谐振无线功率传输的硬件系统，该系统在12cm的距离内点亮4瓦LED灯，实现了功率的无线传输。

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