Abstract：Aiming at the characteristics that the transmission efficiency is sensitive to the coupling coefficient and load change in wireless power transfer (WPT) system, this paper proposes a maximum efficiency tracking method based on the intermittent current mode (DCM) active impedance matching network. First, We analyzed expressions of different DC-DC converter inputs impedance to demonstrate the superiority of impedance matching of the DCM mode Buck-Boost transform circuit.Secondly, a maximum efficiency tracking control strategy based on the coupling coefficient identification was given, which can maximize and stabilize the large load transmission efficiency without real-time load monitoring and further tracking control. When the coupling coefficient changes, the system could also identify the coupling coefficient in real time according to the transmit and receive side voltage and current information, and realize the adaptive maximum efficiency tracking through adjusting the receiver side converter duty cycle. Finally, the feasibility and effectiveness of the method are verified and has obvious advantages in dynamic response and improved transmission efficiency.
赵进国, 赵晋斌, 张俊伟, 毛玲, 屈克庆. 无线电能传输系统中有源阻抗匹配网络断续电流模式最大效率跟踪研究[J]. 电工技术学报, 2022, 37(1): 24-35.
Zhao Jinguo, Zhao Jinbin, Zhang Junwei, Mao Ling, Qu Keqing. Maximum Efficiency Tracking Study of Active Impedance Matching Network Discontinous Current Mode in Wireless Power Transfer System. Transactions of China Electrotechnical Society, 2022, 37(1): 24-35.
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