Analysis of efficiency improvement in wireless power transfer system

作者：Liu, Xin; Wang, Tianfeng; Yang, Xijun^*; Tang, Houjun

来源：IET Power Electronics, 2018, 11(2): 302-309.

DOI：10.1049/iet-pel.2017.0029

• radiofrequency power transmission
• voltage control
• power transmission control
• stability
• wireless power transfer system
• dual-side phase shift control method
• load modulation
• voltage regulation
• compact WPT system
• communication elimination
• active bridges
• simple control logic
• phase shift angles
• PSA
• local control utilisation
• stability analysis
• fault detection method
• MATLAB
• Simulink simulation

Recently, efficiency improvement of wireless power transfer (WPT) systems has been the focus of research. Conventional methods of DC-DC converters are employed for load modulation to achieve high efficiency over large variations in mutual inductance and load. However, these additional circuits degrade the performance due to their inherent losses. To address this problem, this study presents a dual-side phase shift control method for load modulation and voltage regulation in a compact WPT system. The key features of the proposed work are: attaining load modulation and voltage regulation with reduced size of the system; elimination of communication between active bridges and simple control logic. Mathematical expression of equivalent resistance versus the phase shift angles (PSAs) is deduced and the optimal PSAs for maximum efficiency are presented. Utilisation of local control, stability analysis and fault detection method are included. MATLAB/Simulink simulation and experimental results are carried out to validate the proposed method.

• 出版日期2018-2-20
• 单位上海交通大学