List of Titles

Extension of ZVS region of series-series WPT systems by an auxiliary variable inductor for improving efficiency

- Li, Yong, Liu, Shunpan, Zhu, Xia, Hu, Jiefeng, Zhang, Min, Mai, Ruikun, He, Zhengyou

Authors: Li, Yong , Liu, Shunpan , Zhu, Xia , Hu, Jiefeng , Zhang, Min , Mai, Ruikun , He, Zhengyou
Date: 2021
Type: Text , Journal article
Relation: IEEE Transactions on Power Electronics Vol. 36, no. 7 (2021), p. 7513-7525
Full Text: false
Reviewed:
Description: To maintain a stable output voltage under various operating conditions without introducing extra dc/dc converters, phase-shift (PS) control is usually adopted for wireless power transfer (WPT) systems. By using this method, however, zero-voltage switching (ZVS) operation cannot be guaranteed, especially in light-load conditions. To achieve high efficiency and reduce electromagnetic interference, it is significant for WPT systems to achieve ZVS operation of all switching devices in the whole operation range. In this article, an auxiliary variable inductor, of which the equivalent inductance can be controlled by adjusting the dc current in its auxiliary winding, is designed for series-series-compensated WPT systems under PS control to mitigate the loss arising from hard switching. As a result, a wide ZVS operation range of all switching devices can be achieved. A laboratory prototype is built to verify the theoretical analysis. The experimental results show that, under load and magnetic coupling variations, ZVS operation at fixed operation frequency as well as a constant dc output voltage can be maintained. Compared to the conventional method with only PS control, the proposed WPT can achieve higher overall efficiency in a wider load range owing to the wide ZVS operation range. © 1986-2012 IEEE.

High-efficiency WPT system for CC/CV charging based on double-half-bridge inverter topology with variable inductors

- Zhu, Xiao, Zhao, Xing, Li, Yong, Liu, Shunpan, Yang, Huanyu, Tian, Jihao, Hu, Jiefeng, Mai, Ruikun, He, Zhengyou

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.

A simultaneous power and data transmission technology based on coil multiplexing in domino-resonator WPT systems

- Li, Yong, Yang, Xiao, Sun, Wenjun, Hu, Jiefeng, He, Zhengyou

Authors: Li, Yong , Yang, Xiao , Sun, Wenjun , Hu, Jiefeng , He, Zhengyou
Date: 2023
Type: Text , Journal article
Relation: IEEE Transactions on Power Electronics Vol. 38, no. 3 (2023), p. 2878-2883
Full Text: false
Reviewed:
Description: To achieve parallel power and data transmission in domino-resonator wireless power transfer (WPT) systems, a novel simultaneous power, and data transfer (SPDT) technology based on coil multiplexing is proposed in this letter. Benefiting from the magnetic field characteristics of the bipolar coil structure, the power and data can be injected into multiplexed coils with different flow directions, leading to opposite induced voltage polarities in each coupling coil. Subsequently, a corresponding resonator circuit is developed to form independent power and data resonance loops. In addition, an injected data transmission scheme is developed for domino-resonator WPT systems. Compared with traditional SPDT methods, additional wave trappers and coupling structures are avoided by this proposed technology, and the interference between power and data transfer is significantly eliminated. A 23.6 W laboratory prototype with five domino resonators is built to validate the feasibility of this proposed technology. The experimental results show that the power transfer efficiency reaches 70% at 50 kb/s data transfer rate. © 1986-2012 IEEE.

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