Journal ArticleDOI
Calculation of self and mutual impedances in planar magnetic structures
TLDR
In this paper, a set of formulas for the self and mutual impedances of planar coils on ferromagnetic substrates were derived directly from Maxwell's equations and therefore serve as a useful yardstick for simpler approximations.Abstract:
The high frequency operation of magnetic components, in applications such as filters, makes them ideal candidates for thick film technology along with resistors and capacitors. This in turn leads to distinct advantages over labor intensive wire wound components: improved reliability, repeatability, accuracy and consequential cost reductions. This paper establishes a new set of formulas for the self and mutual impedances of planar coils on ferromagnetic substrates. A planar coil in air is a special case of the generalized formulas. The formulas are derived directly from Maxwell's equations and therefore serve as a useful yardstick for simpler approximations. The formulas take full account of the current density distribution in the coil cross-section and the eddy current losses in the substrate. Experimental and calculated impedances up to 100 MHz are presented for a four layer device with three turns per layer which is 150 /spl mu/m thick and 40 mm/sup 2/ in area. >read more
Citations
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Journal ArticleDOI
Optimal Design of ICPT Systems Applied to Electric Vehicle Battery Charge
TL;DR: The steps to follow in the optimized design of an ICPT system and the results obtained in their application to the four most common compensation topologies are shown, pointing out the best one in terms of minimum copper mass and proper stability conditions.
Journal ArticleDOI
Coil Design and Shielding Methods for a Magnetic Resonant Wireless Power Transfer System
Jiseong Kim,Jonghoon J. Kim,Sunkyu Kong,Hongseok Kim,In-Soo Suh,Nam P. Suh,Dong-Ho Cho,Joungho Kim,Seungyoung Ahn +8 more
TL;DR: The basic principles of wireless power transfer using magnetic field resonance are introduced and techniques for the design of a resonant magnetic coil, the formation of a magnetic field distribution, and electromagnetic field (EMF) noise suppression methods are described.
Journal ArticleDOI
Optimal Design of a Hybrid Winding Structure for Planar Contactless Battery Charging Platform
Xun Liu,Shu Yuen Ron Hui +1 more
TL;DR: In this paper, a new hybrid structure consisting of a coil and a spiral winding is proposed for improving the uniform magnetic field distribution over the charging surface, and an analysis into an optimal design of the number of turns and the dimension of the spiral winding was presented for a given concentrated coil.
Journal ArticleDOI
Modeling of Mutual Coupling Between Planar Inductors in Wireless Power Applications
TL;DR: In this article, a compact model of mutual inductance between two planar inductors is presented to design and optimize a wireless power transmission system, where the tracks of the inductors are modeled as constant current carrying filaments, and the mutual induction between individual filaments is determined by Neumann's integral.
Journal ArticleDOI
Design and implementation of low-profile contactless battery charger using planar printed circuit board windings as energy transfer device
TL;DR: A prototype contactless battery charger developed for application with cellular phones is used as an example to address the design considerations for the PCB windings and energy transfer circuit, plus the performance of the contactless charger adapted to a practical application system is demonstrated.
References
More filters
Journal ArticleDOI
Planar inductors on magnetic substrates
W.A. Roshen,D.E. Turcotte +1 more
TL;DR: In this paper, the authors derived a simple formula that describes the enhancement effect of a thick magnetic substrate of permeability mu on the inductance of planar inductors, and showed that a maximum of 100% enhancement over the corresponding air-core value can be obtained.
Journal ArticleDOI
Analysis of planar sandwich inductors by current images
TL;DR: In this paper, a spiral windings sandwiched between top and bottom-plane thick magnetic plates is investigated theoretically using the method of current images, and it is shown that the inductance depends only on the net distance between the top-and bottom magnetic plates and is independent of the position of the spiral wires within the gap, whereas in contrast to open planar structures, the sandwich inductor can yield large values of inductances with the enhancement over air core values limited only by the permeability of the magnetic plates.
Journal ArticleDOI
Modeling of Two-Dimensional Spiral Inductors
TL;DR: In this article, a two-dimensional spiral wound air-core inductors have been investigated for dc-to-dc conversion and closed-form expressions for the total inductance and the resistance are given.
Journal ArticleDOI
On the Self-Inductance of Circular Coils of Rectangular Section
TL;DR: In this paper, it was shown that the self-inductance of a coil of rectangular section can be computed to any order of accuracy when in it are substituted for a and r the mean radius and the G. M. D. respectively, each suitably modified by small quantities which depend on a and on the section of the coil, provided that the series for L is convergent.
Journal ArticleDOI
Some New Formulas for Reactance Coils
TL;DR: In this paper, the authors presented and derived convergent and accurate formulas for mutual inductance of coils with parallel axes, repulsion and self-inductance of long cylindrical coils.