Wireless charging of lithiumion battery technology based on parameter identification

LIU Guoqing, WU Fuxiang, SHI Yuanchun, HUANG Wei, ZHAI Yuan

(Chongqing Research Institute of China Coal Technology & Engineering
Group Corporation, Chongqing 400037, China)

Abstract: Aiming at the output control of the wireless charge system based on electromagnetic induction, a parameter identification unit was applied to measure the voltage, current and the phases of them on the primary coil. The output voltage of the wireless charge system was controlled by the Buck converter according to the result of the parameter identification. The disadvantages of the traditional system efficiently were overcome, in which the two controllers and the communication between the primary side and secondary side were used. The wireless charge system was simplified and the reliability of the system was improved. Then a setup of the wireless charge system with the parameter identification unit for charging the lithium battery was built to verify the design. The experimental results verify the effectiveness of the control parameter identification technology. The results indicate that the charge efficiency of the identification control method is higher than that of the traditional control method with the communication.

Key words: induction mode; unilateral control; parameter identification; Buck converter