A sub-cm3 energy harvester for in-vivo biosensors

Baelhadj, Hacene C; Adhikari, Shyam S.; Davoodi, Hossein; Badilita, Vlad; Beyaz, Mustafa İlker

doi:10.1016/j.mee.2020.111288

Cited by 7 publications

(2 citation statements)

References 27 publications

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“…In recent years, many researchers from both academic and industry have focused on utilizing wind [1][2][3][4], solar [5][6][7], tidal [8,9], and geothermal energies [10][11][12] to alleviate the serious energy crisis and environmental pollution. It is worth noting that harvesting the kinetic energy from human body to power portable electronic devices is a hot research topic in the last decade, such as converting the energy of the knee [13,14], waist [15,16], foot [17], wrist [18], and breathing [19] into electrical energy. Moreover, the traditional power supplements cannot meet the requirements of long life-span and high reliability [20].…”

Section: Introductionmentioning

confidence: 99%

Modeling and experimental investigation of asymmetric distance with magnetic coupling based on galloping piezoelectric energy harvester

Zhang¹,

Zhang²,

Wang³

et al. 2022

Smart Mater. Struct.

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This paper presents an asymmetric magnetic coupling piezoelectric energy harvester based on galloping to scavenge low-speed wind. The piezoelectric beam of energy harvester undergoes bending and torsional vibration simultaneously due to the eccentric distance. By analyzing the kinetic energy, potential energy, and virtual work of the energy harvesting system, the mathematical model of harvester is constructed and verified by experiments. The optimal external load resistance is confirmed at different eccentric distances and wind speeds by experiments. Compared with traditional galloping piezoelectric energy harvester, the asymmetric with magnetically coupling galloping piezoelectric energy harvester has a lower threshold wind speed, i.e. 2 m/s. And the asymmetric configuration contributes to a lower natural frequency and electromechanical coupling coefficient, which results in a lower power and voltage output. The potential energy of harvesting systems at different distances between two magnets are respectively numerical analyzed in detail. The theorical results illustrate that the energy harvester operates in monostable and bistable at different magnet distances. And the threshold wind speed of energy harvester increases when the energy harvester works at bistable. According to the above analysis, this work provides a detailed guideline for mathematical modeling and performance improvement of asymmetric piezoelectric energy harvester based on galloping.

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Section: Introductionmentioning

confidence: 99%

Modeling and experimental investigation of asymmetric distance with magnetic coupling based on galloping piezoelectric energy harvester

Zhang¹,

Zhang²,

Wang³

et al. 2022

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…E LECTROMAGNETIC energy harvesters (EMEH), capable of generating electrical power from mechanical movement, are actively researched since a few decades to supply low-power electronics such as wireless monitoring devices and sensors for various applications [1]- [5]. They are also intensively investigated in the field of biomedical applications to power various wearable electronics by using human-motion EH [6]- [8] as well as for bio-implantable systems for the harvesting capability of the human heart and diaphragm [9], [10]. The minimum required power to monitor physiological parameters and transmit data wire-lessly at low rate is in the range of 500µW [11] [12].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Experimental Characterization of an Electromagnetic Energy Harvester for Wearable and Biomedical Applications

et al. 2020

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This work presents the modeling and the experimental validation of a linear electromagnetic energy harvester (EMEH) actuated by random low-g external acceleration or by a very slow imposed movement. By combining these two different ways of energy scavenging, the system is particularly suited for powering wearable and biomedical electronic devices where the human-motion and movement can be considered as random and non predictable. The design is composed of a mobile stack of head-to-head ringshaped permanent magnets in which a fixed wounded ferromagnetic core, composed of two coils, is located. A custom co-simulation is presented: a finite element analysis (FEA) and a one dimension (1D) two degrees of freedom (2DOF) system model. The FEA is used to optimize the geometry of the EMEH and its form factor, allowing an significative down-scaling. The 1D 2DOF model describes the dynamics of the EMEH in its real environment by considering all the leading mechanical and electrical parameters. The geometry can drastically change the behavior of the system as well as its dynamics: the goal of this double structure is to reduce the magnetic force exerted between the fixed part and the moving part while keeping the magnetic flux gradient in each coil as large as possible. This force was characterized experimentally by using a custom designed test bench, to validate the FEA results. It was observed that the maximum produced energy is reached when the system sweeps across different equilibrium positions rather than oscillating around a given stable position. The second degree of freedom helps the system to settle in a large number of equilibrium positions when submitted to random external accelerations and therefore broadens the frequency response of the EH. Results show a theoretical electrical power output (RMS) of 2 mW for a 10 cm 3 cylindrical harvester submitted to a short external acceleration pulse of 27.5 m/s 2. INDEX TERMS Axisymmetrical geometry, eddy currents, electromagnetic energy harvesters, energy harvesting characterization, finite element analysis, magnetic force, two degrees of freedom.

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High winding ratio, high frequency, ultracompact step-up transformers with laminated metallic magnetic cores

Zhang

Allen

2021

Microelectronic Engineering

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A sub-cm3 energy harvester for in-vivo biosensors

Cited by 7 publications

References 27 publications

Modeling and experimental investigation of asymmetric distance with magnetic coupling based on galloping piezoelectric energy harvester

Modeling and experimental investigation of asymmetric distance with magnetic coupling based on galloping piezoelectric energy harvester

Modeling and Experimental Characterization of an Electromagnetic Energy Harvester for Wearable and Biomedical Applications

High winding ratio, high frequency, ultracompact step-up transformers with laminated metallic magnetic cores

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