Open AccessAnalysis of efficiency improvement in wireless power transfer system
Author(s) -
Liu Xin,
Wang Tianfeng,
Yang Xijun,
Tang Houjun
Publication year - 2018
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2017.0029
Subject(s) - wireless power transfer , matlab , control theory (sociology) , maximum power transfer theorem , converters , inductance , modulation (music) , computer science , electronic engineering , power (physics) , voltage regulation , voltage , wireless , electronic circuit , engineering , electrical engineering , control (management) , telecommunications , philosophy , physics , aesthetics , quantum mechanics , artificial intelligence , operating system
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.