Extended theory on the inductance calculation of planar spiral windings including the effectof double-layer electromagnetic shield

Y. P. Su; Xun Liu; S. Y. (Ron) Hui

doi:10.1109/TPEL.2008.924824

Extended theory on the inductance calculation of planar spiral windings including the effectof double-layer electromagnetic shield

Y. P. Su
, Xun Liu
, S. Y. (Ron) Hui

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

38 Citations (Scopus)

Abstract

Recent progress on wireless planar battery charging platform highlights a requirement that the platform must be shielded underneath so that the electromagnetic (EM) flux will not leak through the bottom of the charging platform. The presence of the EM shield will inevitably alter the flux distribution and thus the inductance of the planar windings. In this paper, a theory of inductance calculation of spiral windings is extended to determine the inductance of planar spiral windings shielded by a double-layer planar EM shield which consists of a layer of soft magnetic material and a layer of conductive material. With the generalized equations, the impedance of the planar spiral windings on double-layer shielding substrate and the optimal thickness of shielding materials can be calculated accurately without using time-consuming finite-element method. Therefore, the influence of the double-layer electromagnetic shield on the inductance of the planar spiral windings can be analyzed. Simulations and measurements have been carried out for several shielding plates with different permeability, conductivity, and thickness. Both of the simulations and measurements of the winding inductance agree well with the extended theory. © 2008 IEEE.

Original language	English
Pages (from-to)	2052-2061
Journal	IEEE Transactions on Power Electronics
Volume	23
Issue number	4
DOIs	https://doi.org/10.1109/TPEL.2008.924824
Publication status	Published - Jul 2008

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

This work was supported by the Hong Kong Research Grant Council under the CERG Project (CityU 114105) and the City University of Hong Kong under the Strategic Research Grant 7001761.

Research Keywords

Double-layer shield
Impedance formulas
Planar spiral inductance

RGC Funding Information

RGC-funded

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title = "Extended theory on the inductance calculation of planar spiral windings including the effectof double-layer electromagnetic shield",

abstract = "Recent progress on wireless planar battery charging platform highlights a requirement that the platform must be shielded underneath so that the electromagnetic (EM) flux will not leak through the bottom of the charging platform. The presence of the EM shield will inevitably alter the flux distribution and thus the inductance of the planar windings. In this paper, a theory of inductance calculation of spiral windings is extended to determine the inductance of planar spiral windings shielded by a double-layer planar EM shield which consists of a layer of soft magnetic material and a layer of conductive material. With the generalized equations, the impedance of the planar spiral windings on double-layer shielding substrate and the optimal thickness of shielding materials can be calculated accurately without using time-consuming finite-element method. Therefore, the influence of the double-layer electromagnetic shield on the inductance of the planar spiral windings can be analyzed. Simulations and measurements have been carried out for several shielding plates with different permeability, conductivity, and thickness. Both of the simulations and measurements of the winding inductance agree well with the extended theory. {\textcopyright} 2008 IEEE.",

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AU - Su, Y. P.

AU - Liu, Xun

AU - Hui, S. Y. (Ron)

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2008/7

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N2 - Recent progress on wireless planar battery charging platform highlights a requirement that the platform must be shielded underneath so that the electromagnetic (EM) flux will not leak through the bottom of the charging platform. The presence of the EM shield will inevitably alter the flux distribution and thus the inductance of the planar windings. In this paper, a theory of inductance calculation of spiral windings is extended to determine the inductance of planar spiral windings shielded by a double-layer planar EM shield which consists of a layer of soft magnetic material and a layer of conductive material. With the generalized equations, the impedance of the planar spiral windings on double-layer shielding substrate and the optimal thickness of shielding materials can be calculated accurately without using time-consuming finite-element method. Therefore, the influence of the double-layer electromagnetic shield on the inductance of the planar spiral windings can be analyzed. Simulations and measurements have been carried out for several shielding plates with different permeability, conductivity, and thickness. Both of the simulations and measurements of the winding inductance agree well with the extended theory. © 2008 IEEE.

AB - Recent progress on wireless planar battery charging platform highlights a requirement that the platform must be shielded underneath so that the electromagnetic (EM) flux will not leak through the bottom of the charging platform. The presence of the EM shield will inevitably alter the flux distribution and thus the inductance of the planar windings. In this paper, a theory of inductance calculation of spiral windings is extended to determine the inductance of planar spiral windings shielded by a double-layer planar EM shield which consists of a layer of soft magnetic material and a layer of conductive material. With the generalized equations, the impedance of the planar spiral windings on double-layer shielding substrate and the optimal thickness of shielding materials can be calculated accurately without using time-consuming finite-element method. Therefore, the influence of the double-layer electromagnetic shield on the inductance of the planar spiral windings can be analyzed. Simulations and measurements have been carried out for several shielding plates with different permeability, conductivity, and thickness. Both of the simulations and measurements of the winding inductance agree well with the extended theory. © 2008 IEEE.

KW - Double-layer shield

KW - Impedance formulas

KW - Planar spiral inductance

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DO - 10.1109/TPEL.2008.924824

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VL - 23

SP - 2052

EP - 2061

JO - IEEE Transactions on Power Electronics

JF - IEEE Transactions on Power Electronics

IS - 4

ER -

Extended theory on the inductance calculation of planar spiral windings including the effectof double-layer electromagnetic shield

Abstract

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Research Keywords

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