中图分类号： TN81 文献标识码： A DOI：10.16157/j.issn.0258-7998.222578 中文引用格式： 王喜升，侯钰慧，郭波超，等. 无线电能传输系统基于Buck-Boost拓扑的最大功率传输研究[J].电子技术应用，2022，48(10)：129-134. 英文引用格式： Wang Xisheng，Hou Yuhui，Guo Bochao，et al. Research on maximum power transfer of wireless power transfer system based on buck-boost topology[J]. Application of Electronic Technique，2022，48(10)：129-134.
Research on maximum power transfer of wireless power transfer system based on buck-boost topology
Wang Xisheng1，Hou Yuhui2，Guo Bochao2，Cui Zhenyu2，Tian Zijian2，Wang Wenqing3
1.China Coal Information Technology(Beijing) Co.，Ltd.，Beijing 100029，China； 2.School of Mechanical Electronic and Information Engineering，China University of Mining and Technology(Beijing)， Beijing 100083，China； 3.Beijing Polytechnic College，Beijing 100042，China
Abstract： In recent years, wireless power transfer(WPT) technology has developed rapidly and is widely used in the consumer field. There are many factors that affect the transmission efficiency of wireless power systems, such as load variation, coil offset, frequency splitting, etc. In order to solve the problem of reducing the transmission efficiency of the system caused by the load change at the receiving end，in this paper, the buck-boost circuit topology is connected in series at the receiving end, and the mathematical model of the WPT system circuit and the coil offset model are established. Then the mutual inductance relationship of the coil offset is deduced. Finally, the relationship between the transmission power and the duty cycle of the coil coaxial model system and the coil offset model system is obtained through simulation. The simulation results show that adjusting the duty cycle of the buck-boost circuit can ensure that both the coil coaxial model system and the coil offset model system can achieve the maximum transmission power of the system when the load changes. It is proved that the buck-boost circuit topology in series can reduce the influence of load changes on the transmission efficiency.
Key words : wireless power transfer;load variation；offset of the coil；buck-boost；duty cycle
0 引言
19世纪90年代初，著名科学家特斯拉就开始了无线电能传输技术(Wireless Power Transfer，WPT)的研究，并隔空点亮了一盏磷光照明灯[1]。到2006年，MIT的科学家Marin Soljacic利用无线电能传输技术在距离2 m处隔空点亮了一盏60 W的灯泡[2-3]。从此，国内外无数学者对WPT的研究进入了高潮期，并将其应用在各个领域。该技术作为一种无接触充电方式[4]，已经被广泛应用在电动汽车、植入式医疗设备、消费电子产品等各个领域[5-6]，给人们的生活带来了很大的便捷性和安全性。
