An Analysis of a Double-layer Electromagnetic Shield for a Universal Contactless Battery Charging Platform

Liu, X.; Hui, S. Y. Ron

doi:10.1109/pesc.2005.1581870

Cited by 27 publications

(6 citation statements)

References 6 publications

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“…The coils in the bottom layer are overlapping with respect to the coils in the top layer. Such a topology can produce a local magnetic field at each position above its surface, such that the wearable sensor nodes can be placed randomly on top of the patient [37,38,31]. The coil matrix is embedded in a 600 mm by 450 mm medium-density fiberboard (MDF).…”

Section: The Inductive Power Transmittermentioning

confidence: 99%

“…The geometric properties of the coils are carefully selected to obtain a trade-off between high coil quality, which improves the link efficiency, and a limited coil inductance, to reduce the voltages at the driver side [40]. To comply with the EMC regulations [41] and to increase the power link efficiency [23], the system is shielded by applying ferrite sheets (IRJ17) at the bottom [38,42].…”

Section: The Inductive Power Transmittermentioning

confidence: 99%

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Contactless energy transfer at the bedside featuring an online power optimization strategy

Clercq

Puers

2014

Sensors and Actuators A: Physical

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a b s t r a c tThis paper introduces the principle of contactless energy transfer to wearable bedside electronics. As a proof of concept, a platform containing a matrix of magnetic energy transmitters has been developed and integrated into a mattress. This system is able to feed one or more wearable sensor nodes, attached to the patient, with the purpose of wirelessly recording vital signals over an extended period of time. Each of these power transmitters is designed to transfer up to 10 mW of power over a maximal distance of 300 mm. Moreover, the platform embeds online optimization software to deal with vertical as well as horizontal sensor node movements. The position and orientation of each freely moving sensor node can be dynamically determined and a local magnetic field, with a matching radiated power level, can be selectively induced in the area where the sensor nodes are positioned. This approach therefore limits the radiation exposure to the patient to the minimum viable level. The prototype is successfully tested in a laboratory set-up.

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Section: The Inductive Power Transmittermentioning

confidence: 99%

Section: The Inductive Power Transmittermentioning

confidence: 99%

Contactless energy transfer at the bedside featuring an online power optimization strategy

Clercq

Puers

2014

Sensors and Actuators A: Physical

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“…Compared with the theory in [11], the formulas for doublelayer substrates almost have the same format as that for single-layer substrates, except that the parameter functions ) ( f and ) ( g have been modified into the forms of (12) and (13).…”

Section: A Two Coaxial Filamentary Turnsmentioning

confidence: 99%

“…A set of theories which are used to calculate the mutual inductance of two planar coaxial coils, (a) in air, (b) on a single-layer substrate, (c) sandwiched between two single-layer substrates have been presented in [10]- [12] by the research team at the National University of Ireland, Galway. Such theory has been extended to cover planar coils with an effective doublelayer electromagnetic (EM) shield [13,14]. The EM shield can affect the magnetic flux distribution and thus must be included in the mutual inductance calculation.…”

Section: Introductionmentioning

confidence: 99%

Mutual inductance calculation of movable planar coils on parallel surfaces

Su¹,

Liu²,

Hui³

2008

2008 IEEE Power Electronics Specialists Conference

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Recent developments of wireless battery charging platform have prompted the requirements to investigate the mutual inductance between a movable planar coil and the fixed planar coil on the charging platform. The wireless battery charging platform must allow the load to be placed anywhere on the charging surface. Therefore the relative position between the movable energy-receiving coil and the energy-transmitting coils on the charging platform must be flexible. In this paper, an extended formula is proposed for the mutual inductance calculation for two coaxial or noncoaxial planar spiral windings sandwiched between two double-layer substrates. It can quickly determine the mutual coupling of two planar windings that can have different relative positions and distance between them. This new calculation method provides a new and useful tool for determining the mutual inductance of a movable planar coil and the fixed planar coil on the wireless battery charging platform. The theory has been favorably tested and compared with practical measurements and also finiteelement analysis. Keywords-planar spiral inductor, impedance formula, contactless battery charging platform, noncoaxial NOMENCLATURE 1 P R , 1 S R Internal radius of windings. 2 P R , 2 S R External radius of windings. P R , S R Radius of filamentary turns. d Distance between axis of primary winding and axis of secondary winding. 1 t , 2 t , 3 t , 4 t Substrate thickness illustrated in Fig. 2. 1 , 2Electrical conductivity of the substrates.

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“…It is efficient than the magnetic induction method. The main advantages are safety and convenience for users [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The WBC no needs user action to operate the system and also no needs a plug to connect to main AC outlet.…”

Section: Introductionmentioning

confidence: 99%

Study of a repeater Tx antenna concept of a portable device wireless battery charging system

Phaebua

Lertwiriyaprapa

Phongcharoenpanich

2014

The 20th Asia-Pacific Conference on Communication (APCC2014)

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A Study of a repeater concept of a transmitting antenna (Tx) for wireless battery charging system of a portable devices is reported in this paper. The objective is to extend the charging area by using the repeater coil concept. The repeater coil is located near the Tx active coil in the same plane of Tx active coil without any direct connection from a source. The operating frequency at 6.78MHz is chosen by following the frequency A4WP wireless battery charging system specification. The proposed Tx antenna is designed for extending a charging distance of the portable devices on xy-plane (such as on table) using a repeater coil (called Rp). The charging area of the proposed antenna is larger than a conventional single Tx antenna. The repeater coil is the same size of the single Tx antenna. The single Tx antenna transfers the magnetic energy to the repeater coil. The receiving antenna (small coil) in a mobile phone picks up the magnetic energy from the repeater coil. The suitable separating distance between the single Tx coil and the repeater coil will be investigated. The study is performed by analyzing the power transfer efficiency of the proposed antennas via scattering parameters [S-parameters] and of the two port network representation. The 50 Ohms system impedance is chosen in this study. The optimum impedance matching at the Tx and Rx sides are considered. It is found that the charging area is increased by using the proposed repeater coil antenna.

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An Analysis of a Double-layer Electromagnetic Shield for a Universal Contactless Battery Charging Platform

Cited by 27 publications

References 6 publications

Contactless energy transfer at the bedside featuring an online power optimization strategy

Contactless energy transfer at the bedside featuring an online power optimization strategy

Mutual inductance calculation of movable planar coils on parallel surfaces

Study of a repeater Tx antenna concept of a portable device wireless battery charging system

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