Recent Advances in Human Motion Excited Energy Harvesting Systems for Wearables

Cai, Mingjing; Yang, Zhaoshu; Cao, Junyi; Liao, Wei-Hsin

doi:10.1002/ente.202000533

Cited by 67 publications

(23 citation statements)

References 131 publications

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“…The SEG is also intended to function as an energy-harvesting device that generates electrical energy from the daily movements of the hands and feet. [21][22][23] Figure 4A shows the design concept for the aforementioned functionality. The liquid is transported to the sponge-filled area by human motion, and the liquid flowing out of the sponge is brought into contact with the electrode to collect the electric charge.…”

Section: Wearable Applicationsmentioning

confidence: 99%

“…B) Charged row. [ 21 ] Materials listed will be either positively or negatively charged. Materials on the left are more likely to be negatively charged, while those on the right are more likely to be positively charged.…”

Section: Design Of Segmentioning

confidence: 99%

“…The SEG is also intended to function as an energy‐harvesting device that generates electrical energy from the daily movements of the hands and feet. [ 21–23 ]…”

Section: Wearable Applicationsmentioning

confidence: 99%

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Fabrication of Soft and Wearable Electrostatic Generator Based on Streaming Electrification

Kamiyauchi

Yokoyama

Kuwajima

et al. 2021

Advanced Intelligent Systems

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Electrostatic actuators, which are characterized by low weight, power consumption, noise, and remaining heat, have been studied widely and are expected to find use in wearable devices. However, they require high‐voltage control and safety circuits, which may increase their bulk. Herein, a soft electrostatic generator is proposed for use in wearable devices. Specifically, streaming electrification is used, wherein electric charge is generated through the interactions between a fluid and a solid material (the developed system is named a “streaming electrification generator”). The contact area with the insulating fluid is increased by using a porous material, and the amount of charge generated is increased to the level needed to drive electrostatic actuators using materials with different dielectric characteristics. Moreover, the generator is made of soft materials and therefore can adapt to the shape of the human body and not interfere with its movement. Finally, it is ideal for wearables because it does not use materials that are harmful to the human body. Thus, the developed system, which is made of soft materials, is a novel power generator and should be suitable for electrostatic actuators used in wearable devices.

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Section: Wearable Applicationsmentioning

confidence: 99%

Section: Design Of Segmentioning

confidence: 99%

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Fabrication of Soft and Wearable Electrostatic Generator Based on Streaming Electrification

Kamiyauchi

Yokoyama

Kuwajima

et al. 2021

Advanced Intelligent Systems

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show abstract

“…[ 36 ] These electromagnetic energy harvesters usually produce high output power from human motion, but their bulky and mechanical nature may cause wearer discomfort. [ 37 ] In fact, the output power of electromagnetic devices is usually dependent on the number of coils and magnetic mass. Hence, it is a challenge to reduce the size, weight and complexity of these energy harvesters.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric energy harvesting for self‐powered wearable upper limb applications

et al. 2021

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Wearable devices can be used for monitoring vital physical and physiological signs remotely, as well as for interacting with computers. Widespread adoption of wearables is somewhat hindered by the duration time they can be used without re‐recharging. To ensure uninterrupted operation, these devices need a constant and battery‐less energy supply. Scavenging energy from the wearable's surroundings is, therefore, an essential step towards achieving genuinely autonomous and self‐powered devices. While energy harvesting technologies may not completely eliminate the battery storage unit, they can ensure a maximum duration of use. Piezoelectric energy harvesting is a promising and efficient technique to generate electricity for powering wearable devices in response to body movements. Consequently, we systematically survey the range of technologies used for scavenging energy from the human body, with a particular focus on the upper‐limb area. According to our review and in comparison to other upper limb locations, highest power densities can be achieved from piezoelectric transducers located on the wrist. For short and fast battery charging needs, we therefore review the range of materials, architectures and devices used to scavenge energy from these upper‐limb areas. We provide comparisons as well as recommendations and possible future directions for harvesting energy using this promising technique.

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“…[7,8] EH from the human motion captures the biomechanical energy from different activities that involve center of mass motion, joints motion, foot strike, and limb swing motion. [9] More recently, efforts have been made to harvest energy, while the subject is doing daily activities such as using a computer, a smartphone, or even eating. [7,[10][11][12][13] In that sense, designing a wearable energy harvester becomes more challenging due to the strict physical constraints of wearable systems in terms of size, weight, form, and, in the case of clothing, mechanical flexibility.…”

Section: Introductionmentioning

confidence: 99%

Battery‐Less Power Management Circuit Powered by a Wearable Piezoelectric Energy Harvester

2021

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A system that aims to manage the energy harvested from the finger movement using a glove‐type garment is proposed. For this, five polyvinylidene difluoride (PVDF) film‐type sensors are mounted on different interphalangeal joints of the fingers. A 68 μF/25 V ceramic capacitor is used as a storage device. A battery‐less power management circuit (PMC) is proposed to isolate the capacitor from the load to reduce the current consumption while charging. When the voltage across the capacitor reaches a threshold voltage, the user decides when to transfer the energy to the electronic load. To test the proposed system, the harvested and conditioned energy is used to power both the PMC and a battery‐less cardiac pulse detection circuit, achieving an autonomy of 20 s. This time depends on the voltage stored in the capacitor and the current consumption of the load. Using the proposed wearable system, it is possible to store up to 700 μJ in the capacitor when a subject manipulates a computer or a cellular phone for 10 min. The proposed system is not limited to the activities presented herein because it can harvest the biomechanical energy from any activity that involves finger movements.

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Recent Advances in Human Motion Excited Energy Harvesting Systems for Wearables

Cited by 67 publications

References 131 publications

Fabrication of Soft and Wearable Electrostatic Generator Based on Streaming Electrification

Fabrication of Soft and Wearable Electrostatic Generator Based on Streaming Electrification

Piezoelectric energy harvesting for self‐powered wearable upper limb applications

Battery‐Less Power Management Circuit Powered by a Wearable Piezoelectric Energy Harvester

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