Modeling, fabrication and characterization of micro-coils as magnetic inductors for wireless power transfer

Amato, Massimiliano; Dalena, Francesco; Coviello, Cristina; Vittorio, Massimo De; Petroni, Simona

doi:10.1016/j.mee.2013.03.038

Cited by 30 publications

(19 citation statements)

References 9 publications

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“…As first process step, a 2 m of 99.99% aluminum layer was sputtered, followed by the first photolithography. The bottom electrode or the first coil level was defined via SiCl 4 /Ar/N 2 inductive coupled plasma reactive ion etching (ICP RIE) [25]. A 2 m thick silicon oxide layer was then sputtered to insulate the first metal layer.…”

Section: Coil Fabrication and Experimental Setupmentioning

confidence: 99%

Optimization of the force and power consumption of a microfabricated magnetic actuator

Zárate

Tosolini

Petroni

et al. 2015

Sensors and Actuators A: Physical

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a b s t r a c tThe force (F) and the power consumption (P) of a magnetic actuator are modeled, measured and optimized in the context of developing micro-actuators for large arrays, such as in portable tactile displays for the visually impaired. We present a novel analytical approach complemented with finite element simulation (FEM) and experiment validation, showing that the optimization process can be performed considering a single figure of merit F/ √ P. The magnetic actuator is a disc-shaped permanent magnet displaced by planar microcoil. Numerous design parameters are evaluated, including the width and separation of the coil traces, the trace thickness, number of turns and the maximum and minimum radius of the coil. We obtained experimental values of F/ √ P ranging from 2 to 12 mN/ √ W using up to 2-layer coils of both microfabricated and commercial printed circuit board (PCB) technologies. This performance can be further improved by a factor of two by adopting a 6-layer technology. The method can be applied to a wide range of electromagnetic actuators.

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Section: Coil Fabrication and Experimental Setupmentioning

confidence: 99%

Optimization of the force and power consumption of a microfabricated magnetic actuator

Zárate

Tosolini

Petroni

et al. 2015

Sensors and Actuators A: Physical

Self Cite

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“…The experimental results show that the average efficiency of the proposed method is able to reach as high as 53% [5]. There are some other people who have made some wireless energy transmission solutions, and they all have achieved good results [6][7][8][9][10]. In this paper, We have simulated efficiencies of the system in the air and seawater and compared them.…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of Efficiency of Wireless Power Transmission System for AUV

Wang¹,

Chi²,

Wei³

et al. 2018

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Adequate electrical energy can guarantee long-term navigation for the autonomous underwater vehicle (AUV). Compared with the traditional wired charging method, wireless charging has the advantages of high security, simple operation and so on, and is more suitable for underwater application. In this paper, we study the efficiency of wireless power transmission (WPT) system in air and seawater. The transmission efficiency of wireless transmission system in air and seawater is compared with HFSS simulation. The reason of system efficiency decay is analyzed, which is helpful for the application of wireless power transmission technology in AUV.

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“…In order to perform this function, implants require a continuous, efficient power supply (Amato et al 2013) that would preferably transmit power wirelessly, thus minimizing the risk of infection, patient discomfort, pain, health care costs and the need for implantable batteries. Inductive power transfer is therefore a necessary technology in developing safer, more robust devices with lower risk of tissue damage caused by long periods of continuous transcutaneous connections (Amato et al 2013;Jow and Ghovanloo 2007;Kadefors et al 1969;Neagu et al 1997). The efficiency of wireless power-transfer however, strongly depends on a variety of parameters such as, the materials used, coupling and distance between the transfer and receiver coils and their geometrical dimensions, for example the length and cross-section of the coil wire.…”

Section: Introductionmentioning

confidence: 99%

“…The efficiency of wireless power-transfer however, strongly depends on a variety of parameters such as, the materials used, coupling and distance between the transfer and receiver coils and their geometrical dimensions, for example the length and cross-section of the coil wire. Besides the outer and inner diameter of the coils, properties of the encapsulation materials influence the overall efficiency of the implant system (Amato et al 2013). The efficiency of coils is measured by their quality factor (Q-factor), which is defined as the ratio of the electromagnetic energy transmitted (E tr ) to the receiver coil and energy dissipated (E dis ) through it according to Equation (1).…”

Section: Introductionmentioning

confidence: 99%

Wireless induction coils embedded in diamond for power transfer in medical implants

Sikder

Fallon

Shivdasani

et al. 2017

Biomed Microdevices

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Wireless power and data transfer to medical implants is a research area where improvements in current state-of-the-art technologies are needed owing to the continuing efforts for miniaturization. At present, lithographical patterning of evaporated metals is widely used for miniature coil fabrication. This method produces coils that are limited to low micron or nanometer thicknesses leading to high impedance values and thus limiting their potential quality. In the present work we describe a novel technique, whereby trenches were milled into a diamond substrate and filled with silver active braze alloy, enabling the manufacture of small, high cross-section, low impedance microcoils capable of transferring up to 10 mW of power up to a distance of 6 mm. As a substitute for a metallic braze line used for hermetic sealing, a continuous metal loop when placed parallel and close to the coil surface reduced power transfer efficiency by 43%, but not significantly, when placed perpendicular to the microcoil surface. Encapsulation of the coil by growth of a further layer of diamond reduced the quality factor by an average of 38%, which can be largely avoided by prior oxygen plasma treatment. Furthermore, an accelerated ageing test after encapsulation showed that these coils are long lasting. Our results thus collectively highlight the feasibility of fabricating a high-cross section, biocompatible and long lasting miniaturized microcoil that could be used in either a neural recording or neuromuscular stimulation device.

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Modeling, fabrication and characterization of micro-coils as magnetic inductors for wireless power transfer

Cited by 30 publications

References 9 publications

Optimization of the force and power consumption of a microfabricated magnetic actuator

Optimization of the force and power consumption of a microfabricated magnetic actuator

Simulation Analysis of Efficiency of Wireless Power Transmission System for AUV

Wireless induction coils embedded in diamond for power transfer in medical implants

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