1.School of Electrical Engineering, Southeast University, Nanjing 210096, China;2.Jiangsu Key Laboratory of Smart Grid Technology and Equipment (Southeast University), Nanjing 210096, China;3.NR Electric Co., Ltd., Nanjing 211102, China
To adapt to the charging profile of lithium-ion battery consisting of an initial constant current (CC) and a subsequent constant voltage (CV), an inductive power transferred battery charger should provide the required output as well as resistive input impedance to reduce device stresses and reactive power during the whole charging process. In view of the fact that the four basic compensation topologies cannot meet the above requirements at the same time, and the high-order compensation network must rely on more devices to satisfy the above requirements, the design freedom of single-stage inductive power transferred battery chargers based on the minimal three-capacitor compensation is systematically derived, which has the characteristics of resistive input impedance and constant output, and the constraints of its compensation parameters and operation frequency are analyzed. Meanwhile, the output characteristics of the S/SP and S/PS structures of three-capacitor compensation are analyzed and compared, and the influence of the compensation component parameters on the input impedance angle and output gain is analyzed to guide the soft switch design. Finally, a single-stage inductive power transferred battery charger with an output of 48 V/2 A is built to verify the feasibility of the above design.
This work is supported by National Natural Science Foundation of China (No. 52077038), Jiangsu Provincial Natural Science Foundation of China (No. BK20181280) and Fundamental Research Funds for the Central Universities (No. 2242020k1G007).
|||YU Jidong, QU Xiaohui, WANG Guoyu, et al. Single-stage Inductive Power Transferred Battery Charger Based on Minimal Three-capacitor Compensation[J]. Automation of Electric Power Systems,2021,45(14):165-172. DOI:10.7500/AEPS20201015003|