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无线电能传输中的高频阻抗匹配特性分析 被引量:4

Analysis of High-frequency Impedance Matching for Wireless Power Transmission
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摘要 磁谐振式无线电能传输技术是基于磁谐振耦合现象利用近区磁场进行非辐射性、中距离输电的新技术。阻抗匹配技术在无线电能传输中广泛使用,用以增加传输距离,提高传输效率,使负载获得最大功率。常规变压器适于在低频下作阻抗匹配,在高频时磁芯容易饱和发热,降低传输效率。使用传输线原理绕制的变压器通过线间电感和电容耦合传输能量,可用于高频传输,亦可在无线电能传输系统中使用。首先,分析了无线电能传输阻抗匹配原理;然后,分析了传输线原理绕制的变压器匹配特性;最后,使用高频变压器进行了无线电能传输的比较实验。实验结果表明,高频变压器可用于无线电能传输,匹配得当时,在增加传输距离的同时可保持较大传输效率和最大输出电压,是提高无线电能传输性能的一种可选方法。 Magnetic resonant wireless power transmission is a new type of technology,which conducts non-radiative,mid-range power transmission using the near magnetic field based on the phenomenon of magnetic resonant coupling.Impedance matching technology is widely used in wireless power transmission to increase the transmission distance,improve the transmission efficiency,and provide maximum power for the load.The conventional transformers are suitable for impedance matching at low frequencies,but their magnetic cores will be saturated and easily heated at high frequencies,thereby reducing the transmission efficiency.The transformers wound based on the transmission line theory can be used for high-frequency transmission by exchanging energy through inductance and capacitance coupling between transmission lines,and they can also be applied to wireless power transmission systems.In this paper,the principle of impedance matching for wireless power transmission is analyzed,and the matching characteristics of transformers wound based on the transmission line theory are analyzed.In addition,comparison experiments were carried out using high-frequency transformers.Experimental results show that the high-frequency transformer can be used in wireless power transmission.Moreover,the system can maintain its transmission efficiency and maximum output voltage while increasing the transmission distance under appropriate matching.Therefore,it is an alternative method to improve the performance of wireless power transmission.
作者 宋显锦 张超 徐小宇 SONG Xianjin;ZHANG Chao;XU Xiaoyu(Department of Power Engineering,Shanxi University,Taiyuan 030013,China;Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China;Institute of Microelectronics,Chinese Academy of Sciences,Beijing 100029,China)
出处 《电源学报》 CSCD 北大核心 2020年第6期161-167,共7页 Journal of Power Supply
基金 国家自然科学基金资助项目(51677177,61501454,51407181)。
关键词 无线电能传输 阻抗匹配 传输线 传输效率 高频 wireless power transmission impedance matching transmission line transmission efficiency high frequency
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