A Coaxial Wrist-Worn Energy Harvester for Self-Powered Internet of Things Sensors

Cai, Mingjing; Liao, Wei-Hsin

doi:10.1109/jiot.2022.3202166

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…One of the major challenges in deploying remote sensors forming a WSN concerns their power supply [5,6]. Batteries are primarily used as a way of powering wireless sensors, but they are commonly known to have limited lifespan [7]. Wired power supply for these sensors is also not a favourable solution since it would be impractical for moving bodies and remote, inaccessible locations.…”

Section: Introductionmentioning

confidence: 99%

A multi-stable rotational energy harvester for arbitrary bi-directional horizontal excitation at ultra-low frequencies for self-powered sensing

Masabi,

Fu,

Flint

et al. 2024

Smart Mater. Struct.

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A rotational multi-stable energy harvester has been presented in this paper for harnessing broadband ultra-low frequency vibrations. The novel design adopts a toroidal shaped housing to contain a rolling sphere magnet which absorbs mechanical energy from bidirectional base excitations can perform continuous rotational movement to transfer the energy using electromagnetic transduction. Eight alternating tethering magnets are placed underneath its rolling path to induce multistable nonlinearity in the system, to capture low frequency broadband vibrations. Electromagnetic transduction mechanism has been employed by mounting eight series connected coils aligned with the stable regions in the rolling path of the sphere magnet, aiming to achieve greater power generation due to optimized rate of change of magnetic flux. A theoretical model has been established to explore the multi-stable dynamics under varying low frequency excitation up to 5 Hz and 3g acceleration amplitudes. An experimental prototype has been fabricated and tested under low frequency excitation conditions. The harvester is capable of operating in intra-well, cross-well and continuous rotation mode depending on the input excitation, and the validated physical device can generate peak power of 5.78 mW with as low as 1.4 Hz and 0.8g sinusoidal base excitation when connected to a 405 Ω external load. The physical prototype is also employed as a part of a self-powered sensing node and it can power a temperature sensor to get readings every 13 s on average from human motion, successfully demonstrating its effectiveness in practical wireless sensing applications.

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Section: Introductionmentioning

confidence: 99%

A multi-stable rotational energy harvester for arbitrary bi-directional horizontal excitation at ultra-low frequencies for self-powered sensing

Masabi,

Fu,

Flint

et al. 2024

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…The Internet of Things (IoT), known as the third wave of the world's information industry after computers and the Internet, has received more and more attention [1]. In the booming era of the IoT, billions of sensors have already been spread all over people's lives for environmental protection, health monitoring, artificial intelligence, and social infrastructure development [2]. The explosive growth of sensors is placing new demands on the energy supply.…”

Section: Introductionmentioning

confidence: 99%

Advanced materials for triboelectric nanogenerator

et al. 2023

J. Phys. D: Appl. Phys.

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Due to the advantages of excellent output power, low cost and easily preparation, triboelectric nanogenerator is developing rapidly in the field of renewable energy. The output performance of triboelectric nanogenerator is largely dependent on the surface charge density, which is closely related to the ability of the tribo-material to gain or lose electrons. To obtain higher output power, numerous efforts have been done on material modifications of the friction layer and electrodes of triboelectric nanogenerator with additional fillers or molecular modifications. In this review, advanced materials for the preparation of triboelectric nanogenerator devices to achieve high output, humidity-resisting and wear-resisting performance are presented and the working mechanisms of performance optimisation are discussed. Moreover, natural materials, recyclable materials and non-conventional electrode materials are mentioned to inspire subsequent research on triboelectric nanogenerator.

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“…As a result, full energy neutrality is allowed even in energy-dry periods. A coaxial wrist-worn energy harvester is proposed in [15] to efficiently capture the biomechanical energy of arm swinging to self-power IoT sensors. The authors used the Lagrangian approach and mirror image method to drive an analytical model for predicting the system dynamics and power generation performance.…”

Section: Introductionmentioning

confidence: 99%

A Low-Complexity Power Maximization Strategy for Coulomb Force Parametric Generators

2023

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Energy harvesting (EH) is the process of capturing and storing energy from external sources or the ambient environment. The EH devices have found various emerging applications, particularly, in healthcare sector. Kinetic-based micro energy-harvesting is a promising technology that could prolong the lifetime of batteries in small wearable or implantable devices. In this paper, using a mathematical model of a Coulomb-force parametric generator, we analyze the dependency of the output power on the electrostatic force in this micro-harvester. We propose a low complexity strategy to adaptively change the electrostatic force in order to maximize the harvested power. Simulation results using the human acceleration measurements confirm the effectiveness of the proposed strategy.

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A Coaxial Wrist-Worn Energy Harvester for Self-Powered Internet of Things Sensors

Cited by 7 publications

References 34 publications

A multi-stable rotational energy harvester for arbitrary bi-directional horizontal excitation at ultra-low frequencies for self-powered sensing

A multi-stable rotational energy harvester for arbitrary bi-directional horizontal excitation at ultra-low frequencies for self-powered sensing

Advanced materials for triboelectric nanogenerator

A Low-Complexity Power Maximization Strategy for Coulomb Force Parametric Generators

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