Analysis and Compensation of Incomplete Coupling for Omnidirectional Wireless Power Transfer

• Main Authors: Wenbin Wang, Huayun Wang, Qiong Li, Jun Xu, Tianqi Meng, Bowen Zhang, Zhen Zhang
• Format: Article
• Language: English
• Published: MDPI AG 2019-08-01
• Series: Energies
• Subjects: contactless charging; inductive power transfer (IPT); omnidirectional; wireless power transfer (WPT)
• Online Access: https://www.mdpi.com/1996-1073/12/17/3277

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.