中圖分類號： TN81
文獻標識碼： A
DOI：10.16157/j.issn.0258-7998.222578
中文引用格式： 王喜升，侯鈺慧，郭波超，等. 無線電能傳輸系統(tǒng)基于Buck-Boost拓撲的最大功率傳輸研究[J].電子技術應用，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

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