Research and Design of Automatic Alteration between Constant Current Mode and Constant Voltage Mode at the Secondary Side Based on LCL Compensation Network in Wireless Power Tranfer Systems
Ji Li1, Wang Lifang1,3, Liao Chenglin1,3, Li Shufan1,2
1. Key Laboratory of Power Electronics and Electric Drive Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China; 2. University of Chinese Academy of Sciences Beijing 100190 China; 3. Beijing Co-Innovation Center for Electric Vehicles Beijing 100081 China
Abstract：In the process of wireless charging for battery, constant current (CC) mode at first and then constant voltage (CV) mode is needed. From the character of resonant circuit, this paper presents an automatic switching method of constant current charging mode to constant voltage charging mode by switching the resonance compensation network parameters at the secondary side based on LCL type compensation network. The proposed changing method can eliminate communications between the primary side and the secondary side and the complex control methods at the primary side and without changing the input voltage and frequency. By an example of changing LCL resonant compensation network at the condition of α=1, the proposed design methods are analyzed and verified, and a set of experiment with 20 centimeters between the coils was built, and a system with output power of 1kW, efficiency of 92%, and constant current output of 5A, constant output voltage of 205V was realized. The experiment shows that the application of the proposed method can realize the demand of constant voltage output after constant current output in the process of wireless charging, and the switching process is automatic and stable
吉莉, 王丽芳, 廖承林, 李树凡. 基于LCL谐振补偿网络的副边自动切换充电模式无线电能传输系统研究与设计[J]. 电工技术学报, 2018, 33(zk1): 34-40.
Ji Li, Wang Lifang, Liao Chenglin, Li Shufan. Research and Design of Automatic Alteration between Constant Current Mode and Constant Voltage Mode at the Secondary Side Based on LCL Compensation Network in Wireless Power Tranfer Systems. Transactions of China Electrotechnical Society, 2018, 33(zk1): 34-40.
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2018, Vol. 33 
