Insole Pedometer With Piezoelectric Energy Harvester and 2 V Organic Circuits

Ishida, Koichi; Huang, Tsung-Ching; Honda, Katsuya; Shinozuka, Yuzo; Fuketa, Hiroshi; Yokota, Tomoyuki; Zschieschang, Ute; Klauk, Hagen; Tortissier, Grégory; Sekitani, Tsuyoshi; Toshiyoshi, Hiroshi; Takamiya, Makoto; Someya, Takao; Sakurai, Takayasu

doi:10.1109/jssc.2012.2221253

Cited by 80 publications

(39 citation statements)

References 5 publications

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“…These results suggest that the rolled PVDF sheets are better suited for energy harvesting applications with a sufficiently large displacement. In addition, multiple rolls can be used to multiply the output [23].…”

Section: Resultsmentioning

confidence: 99%

Flexible Piezoelectric Energy Harvesting Circuit With Printable Supercapacitor and Diodes

Pörhönen

Rajala

Lehtimäki

et al. 2014

IEEE Trans. Electron Devices

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We report a flexible energy harvesting circuit fabricated by roll-to-roll compatible, solution-processable methods. The circuit incorporates a supercapacitor fabricated from a viscous carbon nanotube dispersion, printed Schottky diodes, and a piezoelectric element. Used low-temperature materials enabled component integration on poly(ethylene terephthalate) substrate. The supercapacitor was built with a paper separator and an aqueous NaCl electrolyte. Together with carbon-based electrodes, these materials translated into a disposable and environmentally safe electronic device. The energy harvested from mechanical movement was used to drive a commercial electrochromic display.

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Section: Resultsmentioning

confidence: 99%

Flexible Piezoelectric Energy Harvesting Circuit With Printable Supercapacitor and Diodes

Pörhönen

Rajala

Lehtimäki

et al. 2014

IEEE Trans. Electron Devices

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“…There are a various of design options in kinetic energy harvesting powered wearable devices, such as backpack [44], fabric [48], wristband [38], and footwear [22,41]. We designed our system in the form-factor of shoes for several reasons: first, shoes are worn by users for the majority of time in their daily lives; second, unlike many other wearable devices, shoes have a much larger space to place the energy harvesters; third, is known that feet can generate more energy than other body parts, such as wrist [3,14]. Figure 4 exhibits the system architecture of CapSense and visualizes how it works.…”

Section: Capsense Architecturementioning

confidence: 99%

“…Combining the power consumption in data sampling and transmission together, the overall system power consumption for KEH transducer-based system is 28.15 13 , whereas, the overall system power consumption for CapSense is only 7.53 W 14 . This means that CapSense is able to save 73% of the overall system power consumption of state-of-the-art KEH transducer-based system.…”

Section: Power Consumption For Data Transmissionmentioning

confidence: 99%

Capacitor-based Activity Sensing for Kinetic-powered Wearable IoTs

Lan

et al. 2020

ACM Trans. Internet Things

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We propose a novel use of the conventional energy storage component, i.e., capacitor, in kinetic-powered wearable IoTs as a sensor to detect human activities. Since different activities accumulate energies in the capacitor at different rates, these activities can be detected directly by observing the charging rate of the capacitor. The key advantage of the proposed capacitor based activity sensing mechanism, called CapSense, is that it obviates the need for sampling the motion signal during the activity detection period thus significantly saving power consumption of the wearable device. A challenge we face is that capacitors are inherently non-linear energy accumulators, which, even for the same activity, leads to significant variations in charging rates at different times depending on the current charge level of the capacitor. We solve this problem by jointly configuring the parameters of the capacitor and the associated energy harvesting circuits, which allows us to operate on charging cycles that are approximately linear. We design and implement a kinetic-powered shoe sole and conduct experiments with 10 subjects. Our results show that CapSense can classify five different daily activities with 95% accuracy while consuming 73% less system power compared to conventional motion signal based activity detection.

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“…4, which requires a pMOS-only circuit design. SAM technology enables a total gate oxide thickness of 6 nm and 2 V operation, and DNTT is stable material with a high mobility of 1.0 cm /Vs [15]. The minimum gate length is 20 m. The minimum gate length is determined by the metal mask resolution [16].…”

Section: ) High Mechanical Flexibilitymentioning

confidence: 99%

1 <formula formulatype="inline"><tex Notation="TeX">$\mu$</tex></formula>m-Thickness Ultra-Flexible and High Electrode-Density Surface Electromyogram Measurement Sheet With 2 V Organic Transistors for Prosthetic Hand Control

Fuketa

Yoshioka

Shinozuka

et al. 2014

IEEE Trans. Biomed. Circuits Syst.

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A 64-channel surface electromyogram (EMG) measurement sheet (SEMS) with 2 V organic transistors on a 1 μm-thick ultra-flexible polyethylene naphthalate (PEN) film is developed for prosthetic hand control. The surface EMG electrodes must satisfy the following three requirements; high mechanical flexibility, high electrode density and high signal integrity. To achieve high electrode density and high signal integrity, a distributed and shared amplifier (DSA) architecture is proposed, which enables an in-situ amplification of the myoelectric signal with a fourfold increase in EMG electrode density. In addition, a post-fabrication select-and-connect (SAC) method is proposed to cope with the large mismatch of organic transistors. The proposed SAC method reduces the area and the power overhead by 96% and 98.2%, respectively, compared with the use of conventional parallel transistors to reduce the transistor mismatch by a factor of 10.

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Insole Pedometer With Piezoelectric Energy Harvester and 2 V Organic Circuits

Cited by 80 publications

References 5 publications

Flexible Piezoelectric Energy Harvesting Circuit With Printable Supercapacitor and Diodes

Flexible Piezoelectric Energy Harvesting Circuit With Printable Supercapacitor and Diodes

Capacitor-based Activity Sensing for Kinetic-powered Wearable IoTs

1 <formula formulatype="inline"><tex Notation="TeX">$\mu$</tex></formula>m-Thickness Ultra-Flexible and High Electrode-Density Surface Electromyogram Measurement Sheet With 2 V Organic Transistors for Prosthetic Hand Control

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