Open AccessNon‐sine wave characteristic in the magnetic field of the wireless power transfer system
Author(s) -
Kang Jianwei,
Wang Quandi,
Li Wanlu,
Wang Yingcong
Publication year - 2019
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.2018.5905
Subject(s) - sine wave , sine , non sinusoidal waveform , power (physics) , distortion (music) , mathematics , physics , mathematical analysis , acoustics , waveform , quantum mechanics , geometry , voltage , amplifier , optoelectronics , cmos
This study presents an insight into the time‐varying characteristic, especially for the non‐sine wave characteristic, of magnetic field (MF) of the wireless power transfer system. First, a filament mode is built and a key expression of MF is obtained, presenting a theoretical proof of the existence of the non‐sine wave. Second, the reasons and conditions of the non‐sine wave are discussed from both electromagnetic and circuit views. Third, the quantity of MF sine‐wave distortion (MFSD) is proposed to quantify the non‐sine wave characteristic. The current phase difference (CPD) and the current magnitude ratio (CMR) are used to denote the working conditions of the WTPS. The MFSD under a sweeping CPD and CMR is analysed, perfectly quantifying the non‐sine wave characteristic and showing that the CPD = −90° and CMR = 1 are the most evident situations of the non‐sine wave appearing. Fourth, a sine‐wave assumption and its related complex magnitude of the total MF are analysed and compared by the maximum real value of MF. This finding shows that an error of 35% could appear under the sine‐wave assumption but can be eliminated by the method in this study. Finally, an experiment has been conducted to verify the analysis.