Analysis of Coil-Thickness-Variation Technique for Q-Factor Enhancement of Rectangular Planar Coils

For wireless power transfer (WPT) applications, such as battery charging, the attainment of a high coil quality factor (<inline-formula> <tex-math notation="LaTeX">Q </tex-math></inline-formula>) becomes prudent to ensure a high-power transfer efficiency (PTE). In t...

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Bibliographic Details
Published inIEEE transactions on antennas and propagation Vol. 71; no. 2; pp. 1875 - 1882
Main Authors Moon, Jung-Ick, Awuah, Charles Marfo, Danuor, Patrick, Jung, Young-Bae
Format Journal Article
LanguageEnglish
Published New York IEEE 01.02.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Battery chargers
Coil thickness
coil trace
Coils
Conductors
Immune system
Inductance
Magnetic fields
power transfer efficiency (PTE)
Q-factor
quality factor (Q)
Resistance
Spirals
Thickness
wireless power transfer (WPT)
Wireless power transmission
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Summary:For wireless power transfer (WPT) applications, such as battery charging, the attainment of a high coil quality factor (<inline-formula> <tex-math notation="LaTeX">Q </tex-math></inline-formula>) becomes prudent to ensure a high-power transfer efficiency (PTE). In this article, we demonstrate an effective method to enhance <inline-formula> <tex-math notation="LaTeX">Q </tex-math></inline-formula> by employing different thicknesses for each trace of the coil. The thickness of the inner turns of the coil, where high alternating current (ac) losses are concentrated, is relatively smaller compared to the outer coil turns. This technique realizes a reduction in the ohmic resistance, thereby increasing <inline-formula> <tex-math notation="LaTeX">Q </tex-math></inline-formula> of the coil. Furthermore, we present the analysis on the performance of the conventional coils with the same turn thicknesses compared to the proposed coil. To validate this technique, the prototypes of both the proposed and conventional coil structures are fabricated, where good agreement is achieved between the simulation and measurement results. The proposed coil realizes an increment of about 11.54% in <inline-formula> <tex-math notation="LaTeX">Q </tex-math></inline-formula> compared to the conventional coil.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2023.3234985