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J. Renewable Sustainable Energy 1, 062701 (2009); doi:10.1063/1.3255465 (14 pages)

Wearable electronics self-powered by using human body heat: The state of the art and the perspective

Vladimir Leonov1 and Ruud J. M. Vullers2

1Smart Systems and Energy Technology Unit, Interuniversity Microelectronics Center (IMEC), Kapeldreef 75, 3001 Leuven, Belgium
2Smart Systems and Energy Technology Unit, IMEC/Holst Centre, High Tech Campus 31, Eindhoven 5656 AE, The Netherlands

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(Received 29 July 2009; accepted 6 October 2009; published online 6 November 2009)

In this paper, we present our vision of what kind of wearable devices and how they can be powered by the heat of human beings and by using ambient light. The basic principles of designing body-powered devices and ways of their hybridizing with photovoltaic cells are discussed. The mechanisms of thermoregulation in humans and the laws of thermodynamics enable placing a distinct boarder between realistic targets and the science fiction. These allow prediction of application areas for wearable energy harvesters accounting for competitive batteries with long service life. The existing family of body-powered wearable devices and new technologies for thermopiles are discussed. The theory and practice point at the necessity of using microelectronic and microelectromechanical system technologies for the target application area. These technologies for thermopiles offer the possibility of reduced production cost. Therefore, autonomous systems powered thermoelectrically could be successfully marketed. The related aspects of design and fabrication are discussed.

© 2009 American Institute of Physics

Article Outline

  1. WHAT IS AN ENERGY HARVESTER
  2. THE HISTORY OF ENERGY HARVESTING FOR POWERING DEVICES
  3. THEORETICAL BASES OF BODY-POWERED ELECTRONICS
  4. WEARABLE DEVICES POWERED BY THE USER’S BODY
  5. BODY-POWERED SYSTEMS IN CLOTHING
  6. MODERN TECHNOLOGIES FOR WEARABLE THERMOPILES
  7. CONCLUSION

KEYWORDS and PACS

PACS

PUBLICATION DATA

ISSN:

1941-7012 (print)  
1941-7012 (online)

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  25. V. Leonov and R. J. M. Vullers, SEMICON Singapore, 20–22 May 2009, “Wearable electronics self-powered from the human body: State of the art and perspectives,” http://www.semiconsingapore.org/ProgrammesandEvents/cms/groups/public/documents/web_content/ctr_029926.pdf.


Figures (10) Tables (4)

Figures (click on thumbnails to view enlargements)

FIG.1
Body-powered wireless pulse oximeter.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
Power consumption pie of pulse oximeter at an update rate of 15 s.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
Body-powered ECG headband: (1) is a TEG and (2) is an electronic module.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.4
Wireless EEG system with hybrid thermoelectric-PV power supply.

FIG.4 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.5
Power consumption pie of self-powered battery-free EEG systems.

FIG.5 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.6
Wireless ECG shirt powered by a hybrid thermoelectric-PV power supply: three thermoelectric modules, one of which intentionally colored in pink (1), and amorphous PV cells (2).

FIG.6 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.7
Electronic module of the EEG shirt upon its waterproof encapsulation.

FIG.7 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.8
Scaling of a thermopile at its constant thermal resistance. While thermopiles on the market require high aspect ratio l/w (left), their miniaturized microelectronic counterparts need much lower aspect ratio (right).

FIG.8 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.9
Micromachined polycrystalline SiGe thermopile: (a) Design of a thermocouple with a 2.5 μm deep trench, (a) and (b) are hot and cold thermocouple junctions, respectively; (b) SEM picture of three thermocouple bridges over a trench; (c) a corner of the rim filled with thermocouples; (d) the design of a thermopile on a silicon rim (not in scale); (e) the design of a thermoelectric generator, wherein the thermopile die is flip-chip bonded to the heat sink (top) die; and [(f) and (g)] two wrist TEGs with a micromachined thermopile inside.

FIG.9 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.10
Design of arcade thermocouples (left: three thermocouples are shown) (modify from Ref. 17), and a SEM picture of self-supported 6 μm tall released thermocouples with a critical dimension of 3 μm reported in Ref. 19.

FIG.10 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

Tables

Table I. Pulse oximeter features at 22 °C, typically.

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Table II. EEG headband features.

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Table III. Features of the battery-free electroencephalorgaphy diadem with hybrid power supply at daytime, typically.

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Table IV. Some features of the ECG shirt with hybrid power supply (preliminary data).

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