scholarly journals Analysis and Compensation of Incomplete Coupling for Omnidirectional Wireless Power Transfer

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3277 ◽  
Author(s):  
Wenbin Wang ◽  
Huayun Wang ◽  
Qiong Li ◽  
Jun Xu ◽  
Tianqi Meng ◽  
...  
Keyword(s):  
Coupling Effect ◽  
Dimensional Space ◽  
Full Range ◽  
Three Dimensional ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Transmitted Power ◽  
Wireless Power ◽  
Power Capability ◽  
Three Dimensional Space

This paper proposes a detailed analysis of the incomplete coupling effect in omnidirectional wireless power transfer systems and a compensation method aiming to improve the transmission performance. Recently, omnidirectional wireless charging technologies have been gradually explored and studied. These charging technologies can transmit power to arbitrary directions in three-dimensional space. However, there are still specific regions where the transmitted power capability dramatically drops to an extremely low level due to the incomplete coupling effect. Accordingly, this paper provides a theoretical analysis and compensation of such an effect. The compensation effectiveness is validated by both a simulation and a 7 W experimental prototype. After the compensation, the transmitted power can be improved by 61% to drive the load in a full range of the space.

Full-Range Soft-Switching Pulse Frequency Modulated Wireless Power Transfer

2020 ◽  
Vol 35 (6) ◽  
pp. 6533-6547 ◽  
Author(s):  
Wei Liu ◽  
K. T. Chau ◽  
Christopher H. T. Lee ◽  
Wei Han ◽  
Xiaoyang Tian ◽  
...  
Keyword(s):  
Full Range ◽  
Wireless Power Transfer ◽  
Pulse Frequency ◽  
Soft Switching ◽  
Power Transfer ◽  
Wireless Power

scholarly journals Free-Positioning Wireless Power Transfer Using a 3D Transmitting Coil for Portable Devices

2020 ◽  
Vol 20 (4) ◽  
pp. 270-276
Author(s):  
Nam Ha-Van ◽  
Hoang Le-Huu ◽  
Minh Thuy Le ◽  
Kwangsuk Park ◽  
Chulhun Seo
Keyword(s):  
Three Dimensional ◽  
Wireless Power Transfer ◽  
Receiver Coil ◽  
Portable Devices ◽  
Power Transfer ◽  
Wireless Power ◽  
Transfer Energy ◽  
Resonant Coupling ◽  
Power Transfer Efficiency ◽  
Receiving Coil

The free-positioning wireless power transfer (WPT) system has drawn attention in recent years. Traditionally, a WPT system can transfer energy in one or two directions on the same plane, but it leads the restrictions of angle and axis misalignment between a transmitter and a receiver coil. In this paper, we propose a free-positioning WPT system using a three-dimensional cubic-shaped transmitting coil for portable device charging. A small receiving coil is placed inside the transmitter to achieve the transferred energy through the magnetic resonant coupling. In addition, the equivalent circuit and the mutual inductance between the Tx and Rx coils are analyzed. Finally, a practical experiment is implemented to verify the transfer performance, which can reach up to about 50% power transfer efficiency. The proposed system can charge in spatial freedom.

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