Design and Optimization of Printed Circuit Board Inductors for Wireless Power Transfer System

Islam, Ashraf B.; Islam, Syed K.; Tulip, Fahmida S.

doi:10.4236/cs.2013.42032

Cited by 44 publications

(14 citation statements)

References 18 publications

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“…The parasitic capacitance between the nearby turns can be computed from Equation (10) [ 49 , 50 ], where α and β are 0.9 and 0.1, respectively, and represent the parasitic contribution due to the air gap between the coil turns, and the gap between the metallic tracks and the substrate, as shown in Figure 3 c.

and

are the relative permittivity of air and substrate material respectively.

…”

Section: Methodsmentioning

confidence: 99%

Thin-Film Flexible Wireless Pressure Sensor for Continuous Pressure Monitoring in Medical Applications

Farooq

Iqbal

Vázquez

et al. 2020

Sensors

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Physiological pressure measurement is one of the most common applications of sensors in healthcare. Particularly, continuous pressure monitoring provides key information for early diagnosis, patient-specific treatment, and preventive healthcare. This paper presents a thin-film flexible wireless pressure sensor for continuous pressure measurement in a wide range of medical applications but mainly focused on interface pressure monitoring during compression therapy to treat venous insufficiency. The sensor is based on a pressure-dependent capacitor (C) and printed inductive coil (L) that form an inductor-capacitor (LC) resonant circuit. A matched reader coil provides an excellent coupling at the fundamental resonance frequency of the sensor. Considering varying requirements of venous ulceration, two versions of the sensor, with different sizes, were finalized after design parameter optimization and fabricated using a cost-effective and simple etching method. A test setup consisting of a glass pressure chamber and a vacuum pump was developed to test and characterize the response of the sensors. Both sensors were tested for a narrow range (0–100 mmHg) and a wide range (0–300 mmHg) to cover most of the physiological pressure measurement applications. Both sensors showed good linearity with high sensitivity in the lower pressure range <100 mmHg, providing a wireless monitoring platform for compression therapy in venous ulceration.

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and

are the relative permittivity of air and substrate material respectively.

…”

Section: Methodsmentioning

confidence: 99%

Thin-Film Flexible Wireless Pressure Sensor for Continuous Pressure Monitoring in Medical Applications

Farooq

Iqbal

Vázquez

et al. 2020

Sensors

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“…1 is proposed. Several previous works [3], [4] proposed a tapered structure where every segment is characterized by a width:…”

Section: Proposed Coils' Geometrymentioning

confidence: 99%

“…In this context and in order to enhance the coils quality factors, two new Printed Spiral Coil (PSC) geometries, single and double layer variable width PSC, are first proposed. The use of variable width structures is warranted by the following reasons: (1): Based on [5] and [6] results, designing a structure with tapered width improves the quality factor in comparison with uniform with coils' (2): By reason of the limited space available to place received coil inside human body double layer square coil may be an appropriate solution, since with equal printed spiral coil (PSC) dimensions, double layer PSC achieve significantly higher inductances and quality factors in comparison with single layer coil [4], [7]. The second part of the paper focuses on the study of the lateral misalignments impacts' on inductive link performance.…”

Section: Introductionmentioning

confidence: 99%

“…Despite of this favor, wireless power transfer (WPT) suffers from many weaknesses such as low coils performance due the limited space for placing the receiving coil and also due to the system efficiency robustness to coupling variations and lateral misalignments of the coils. The inductive link efficiency, as discussed in [3], and [4], dependents strongly on the coupling coefficient (k) between the primary and secondary coils, and their quality factors (Q). Therefore, the foremost objective in an inductive link design is to achieve the highest possible unloaded Q and k. These parameters are strongly related to the shape, size and relative positions of the transmitting and receiving coils.…”

Section: Introductionmentioning

confidence: 99%

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Performance characterization of variable width square coils for inductive link wireless power transfer

Mehri

Ammari

Slama

et al. 2016

2016 18th Mediterranean Electrotechnical Conference (MELECON)

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Supplying power to electronic medical implants (EMI) by inductive coupling has always been appreciated for its biocompatibility and its ability to transmit sufficient power to the implants. Although this method was introduced a long time ago, several challenges remain. The major challenge is the sensitivity of the link to coupling and quality factor variations which are strongly dependent on the separation distance and lateral displacements between receiving and issuing coils. In this context and in order to increase the coils' quality factor and to improve the system robustness to coupling factor variations, a new variable width square coil models are proposed and compared with conventional inductive link structures. Walking through experimental validations, this paper shows that employing variable width single layer coil, the quality factor and inductance of the coils are enhanced by 3.4 % and 8.2 % respectively in comparison with standard uniform with coil. Lateral misalignment robustness investigations confirms that, compared with single layer coils, an inductive link composed of double layer square coils is 120 % and 45% less sensitive to lateral misalignments according respectively to x and y axis.Keyword: inductive link efficiency, variable width coil, double layer coil, laterals misalignments.

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“…In order to maximize the PTE, optimizing the geometries of coils of TX and RX has been proposed [17][18][19]. However, the optimized coils with the proper size, turns and conductor width for the maximizing PTE in these references were only effective for a certain transfer distance.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Optimization of Three-Resonator Wireless Power Transfer System for Predetermined-Goals Wireless Power Transmission

Jin

Cheng

2016

Energies

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Three-resonator wireless power transfer (WPT) systems have been proposed to improve the power transfer efficiency (PTE) and power delivered to the load (PDL) in recent years. However, analysis formulas of a three-resonator WPT system are complicated, and the parameters for clarifying the transfer characteristics of this system are difficult to extract. In this paper, concise formulas for analyzing PTE and PDL of the three-resonator system are derived by introducing three factors. Diagram discriminance based on the derived formulas is proposed to obtain the frequency splitting criterions of PTE and PDL in this system. Further, at the transfer distances, where the PTE and PDL are low at original frequency due to frequency splitting phenomenon, the two predetermined-goals of maximizing PTE and PDL are achieved by optimizing coupling strength between the three resonators. The third predetermined-goal of obtaining a constant amount of PDL transfer at maximum PTE is also implemented based on basic algorithms in numerical software. Finally, Simulation and measurement results verify the correctness of analyzing the transfer characteristics of three-resonator WPT system using the presented concise formulas and discriminance. Moreover, effectiveness of realizing the three predetermined-goals via the proposed optimization method is confirmed with experiments.

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Design and Optimization of Printed Circuit Board Inductors for Wireless Power Transfer System

Cited by 44 publications

References 18 publications

Thin-Film Flexible Wireless Pressure Sensor for Continuous Pressure Monitoring in Medical Applications

Thin-Film Flexible Wireless Pressure Sensor for Continuous Pressure Monitoring in Medical Applications

Performance characterization of variable width square coils for inductive link wireless power transfer

Analysis and Optimization of Three-Resonator Wireless Power Transfer System for Predetermined-Goals Wireless Power Transmission

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