Self-powered smart watch and wristband enabled by embedded generator

Cai, Mingjing; Wang, Jiahua; Liao, Wei-Hsin

doi:10.1016/j.apenergy.2020.114682

Cited by 59 publications

(26 citation statements)

References 28 publications

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“…Compared with other methods, [ 101,105,106 ] increasing the energy conversion capacity demonstrates significant superiority in enhancing the power and power density. [ 107,108,110,111 ]…”

Section: Human Motion‐based Energy Harvesting Systemsmentioning

confidence: 99%

“…[ 128 ] Typically, a smart watch equipped with a microcontroller unit (47 μW), [ 129 ] a pedometer (75 μW), a heart rate sensor (105 μW), [ 130 ] a temperature sensor (30 μW), [ 131 ] and a wireless transmitter (40 μW) [ 132 ] only requires a total power supply of 297 μW, which could be fully powered by the energy harvesters. [ 108,111 ] Apart from powering the smart watches with versatile functions, the limb swing excited energy harvester can also be used for human activity recognition. As an example, Cao et al utilized a TENG to simultaneously sense the human motion and produce electricity, which can be worn on human limbs to detect various motions.…”

Section: Possible Self‐powered Applicationsmentioning

confidence: 99%

“…[ 110 ] More recently, Cai et al proposed a high‐performance embedded generator with a maximum power of 1.74 mW. [ 111 ] As shown in Figure 14 , this device used magnetic frequency‐up converter and coaxial topology to achieve high compact device and enhance energy conversion capacity.…”

Section: Human Motion‐based Energy Harvesting Systemsmentioning

confidence: 99%

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Recent Advances in Human Motion Excited Energy Harvesting Systems for Wearables

et al. 2020

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The development of wearable electronics and sensors is constrained by the limited capacity of their batteries. Therefore, energy harvesting from human motion is explored to provide a promising embedded sustainable power supply for wearable devices. Herein, the principles, development, and applications of human motion excited energy harvesters are reviewed. The energy harvesters are classified based on the human motions with distinguished characteristics: center of mass motion (COM), joint motion, foot strike, and limb swing motion. According to the motion characteristics, the principles, features, and limitations of different energy harvesters are discussed, and the power generation performances are compared. Finally, various self-powered applications enabled by embedded energy harvesters are introduced, so as to show the great potential of embedded energy harvesting systems in boosting the development of the wearables.

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“…Compared with other methods, [ 101,105,106 ] increasing the energy conversion capacity demonstrates significant superiority in enhancing the power and power density. [ 107,108,110,111 ]…”

Section: Human Motion‐based Energy Harvesting Systemsmentioning

confidence: 99%

Section: Possible Self‐powered Applicationsmentioning

confidence: 99%

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Recent Advances in Human Motion Excited Energy Harvesting Systems for Wearables

et al. 2020

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“…Moreover, technologies exploiting the temperature difference across a person's body to generate power by so-called "body-heat harvesting" have been proposed [16,17]. Technology to capture the motion of arm swing has also been proposed [18].…”

Section: Introductionmentioning

confidence: 99%

Effective methods to promote heat dissipation of wrist wearables

Matsuhashi

Hachiya

Kanamoto

et al. 2021

IEICE Electron. Express

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Wearable technology has been rapidly evolving. Many functions beyond current smartphone capabilities must be realized in wearables that are smaller than smartphones. Heat generation due to power consumption may cause both circuit malfunctions and lowtemperature burns. This letter presents thermal design methods to promote heat dissipation of wrist wearables. First, the thermal model to easily obtain each part temperature is described. Next, belt heat dissipation effects are clarified by simulations with the model. The results indicate that each technique using the belt width, thickness, length, covering rubber, or heatsink has a high effect on heat dissipation. In addition, by combining these techniques, temperature rises of the display, bottom of device body, and belt can be reduced by 30.5%, 52.4%, and 52.7%.

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“…Abdelnaby and Arafa [8] proposed an electromagnetic EH capable of generating 0.14 mW from 5 Hz excitation frequency and 1.8 mm excitation amplitude. Other critical influences in energy harvesting using electromagnetic transductions include applications of cantilever beams [8][9][10], rotational mechanisms [11][12][13][14] and pendulum-based structures [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

An Ultra-Low Frequency Magnet-Tethered Vibration Energy Harvester for Self-Powered Sensing

Masabi

Theodossiades

2021

2021 21st International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers)

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Wireless sensors face challenges regarding power supply and maintenance when batteries are used. To provide an effective solution, this paper presents a bistable energy harvester capable of exploiting ultra-low frequency vibration to energize low-powered devices. The energy harvester uses rotary-translational motion of a spherical rolling magnet contained inside a frame, with two tethering magnets below the rolling magnet's path to enable two stable positions. To examine the performance of the design, a prototype was fabricated and tested under varying excitation conditions and external loads. An output of 7.1 mW at 750 Ω was effectively determined. A power management circuit is integrated with the energy harvester; the harvester can charge a 470 µF capacitor to 3.4 V within 82 s at 0.7 g and 2 Hz.

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Self-powered smart watch and wristband enabled by embedded generator

Cited by 59 publications

References 28 publications

Recent Advances in Human Motion Excited Energy Harvesting Systems for Wearables

Recent Advances in Human Motion Excited Energy Harvesting Systems for Wearables

Effective methods to promote heat dissipation of wrist wearables

An Ultra-Low Frequency Magnet-Tethered Vibration Energy Harvester for Self-Powered Sensing

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