Open AccessCrossed flat solenoid coupler for stationary electric vehicle wireless charging featuring high misalignment tolerance
Author(s) -
Yao Yousu,
Tang Chengxiong,
Wang Yijie
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.2020.0452
Subject(s) - wireless power transfer , coupling coefficient of resonators , capacitor , maximum power transfer theorem , planar , solenoid , topology (electrical circuits) , coupling (piping) , inductor , displacement (psychology) , finite element method , hybrid coupler , electronic engineering , electrical engineering , power (physics) , materials science , engineering , computer science , electromagnetic coil , physics , voltage , power dividers and directional couplers , mechanical engineering , structural engineering , psychology , computer graphics (images) , resonator , quantum mechanics , psychotherapist
This study proposes a crossed flat solenoid coupler (CFSC) for electric vehicle wireless charging. The impact of four size parameters of CFSCs on coupling coefficient and misalignment tolerance is studied using finite‐element analysis. The optimisation methodology of CFSCs considering size constraints is given. The CFSC is compared with the planar square coupler (PSC) and double D coupler (DDC) from three aspects: coupling coefficient, misalignment tolerance, and copper usage. The CFSC performs the best in the three aspects, and the DDC performs the worst. Two wireless power transfer prototypes, one employing CFSCs and the other utilising PSCs, were built to demonstrate the superiority of the proposed coupler. Primary inductor‐capacitor‐capacitor secondary series compensation topologies were employed in the two prototypes. Experiments agree well with theoretical analysis and simulations. The power transfer efficiency of the CFSC‐based prototype was 1.6% higher than the PSC‐based prototype when the Z ‐axis displacement is 45 mm.