Open AccessAnalysis and design of a high‐efficiency three‐coil WPT system with constant current output
Author(s) -
Yang Lin,
Li Xiaoming,
Xu Ziwei,
Liu Sheng,
Dong Zifan,
Wu Yuanbao
Publication year - 2020
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.815
H-Index - 97
eISSN - 1751-8679
pISSN - 1751-8660
DOI - 10.1049/iet-epa.2019.0967
Subject(s) - electromagnetic coil , wireless power transfer , sensitivity (control systems) , correctness , compensation (psychology) , control theory (sociology) , voltage , flexibility (engineering) , engineering , electronic engineering , computer science , electrical engineering , mathematics , control (management) , algorithm , psychology , statistics , artificial intelligence , psychoanalysis
The wireless power transfer (WPT) system has been widely researched due to its inherent advantages compared with the traditional plug‐in charging system over security, flexibility, convenience and so on. Compared with the two‐coil WPT system, the three‐coil WPT system has been proven to have higher efficiency over a relatively long transmission distance. In many applications, WPT systems are required to have the load‐independent constant current output (CCO) characteristic and zero phase angle (ZPA) operation. This study proposes a three‐coil WPT system that can achieve the CCO and ZPA operation through flexible parameter design. First, the detailed mathematical deduction for the CCO and ZPA operation is given. Then, a comprehensive analysis of the three‐coil WPT system is conducted in term of parameter design, the sensitivity of the CCO to changes in compensation parameters, implementation of zero voltage switching operation and efficiency analysis. Furthermore, a detailed efficiency comparison with the SS WPT system is performed to reflect the high efficiency of the proposed three‐coil system, and the additional performance of the proposed three‐coil system is compared with previous related works to verify its advantages further. Finally, the correctness of the theoretical analysis is verified by simulation and experiment.