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| 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 |
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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
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Received: 20 June 2018
Published: 26 September 2018
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2018, Vol. 33 
