List of Titles

Authors: Li, Yong , Sun, Wenjun , Zhu, Xiao , Hu, Jiefeng
Date: 2022
Type: Text , Journal article
Relation: IEEE Transactions on Industrial Electronics Vol. 69, no. 7 (2022), p. 6870-6880
Full Text: false
Reviewed:
Description: Traditional wireless power transfer (WPT) systems usually adopt the triple-phase-shift control method to maintain a constant output voltage, track the maximum system efficiency point (MEPT), and achieve zero-voltage-switching (ZVS) operation for various applications. However, these three targets are achieved at the cost of high reactive power on both primary and secondary sides, especially under light-load conditions, leading to low efficiency. This has become one of the challenges that hinder a further deployment of WPT technologies in practice. To address this vital problem, in this article, how the reactive power lowers the system efficiency is revealed based on a mathematical model established. Then, a hybrid modulation control strategy based on a proper selection between the full-bridge and half-bridge modes of the inverter and active rectifier is developed. An experimental prototype is constructed to verify the effectiveness of the proposed control method. Experimental results show that the proposed method can reduce the reactive power, maintain a constant output voltage, and realize the MEPT and ZVS operation, with high efficiencies up to 94.29% in a wide load range. © 1982-2012 IEEE.

Authors: Zhu, Xiao , Zhao, Xing , Li, Yong , Liu, Shunpan , Yang, Huanyu , Tian, Jihao , Hu, Jiefeng , Mai, Ruikun , He, Zhengyou
Date: 2022
Type: Text , Journal article
Relation: IEEE Transactions on Power Electronics Vol. 37, no. 2 (2022), p. 2437-2448
Full Text: false
Reviewed:
Description: Efficiency remains a key challenge in wireless charging in academia and industry. In this article, a new wireless power transfer (WPT) system based on a double-half-bridge (DHB) inverter with two variable inductors (VIs) is proposed. Compared with conventional full-bridge (FB) inverters, the DHB inverter can reduce the current through the mosfets under the same output power and thus, reduce the conduction loss. Next, by adjusting the inductances of the VIs instead of using phase shift (PS) method, the output voltage or current can be controlled, while the circulating current can be eliminated and wide-range zero voltage switching operation can be achieved. Consequently, the power loss can be further reduced. Circuit analysis, VI design, as well as hardware implementation, are provided in detail. A laboratory prototype is built to verify the feasibility of the proposed method. Close agreement is obtained between simulation and experimental results. The maximum efficiency can reach 92.4%, which is 3.65% higher than traditional PS control. © 1986-2012 IEEE.

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