How Much Energy Can We Harvest Daily for Wearable Applications?

Emerging flexible and stretchable devices open up novel and attractive applications beyond traditional rigid wearable devices. Since the small and flexible form-factor severely limits the battery capacity, energy harvesting (EH) stands out as a critical enabler of new devices. Despite increasing int...

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Published in:2021 IEEE/ACM International Symposium on Low Power Electronics and Design (ISLPED) pp. 1 - 6
Main Authors: Tuncel, Yigit, Basaklar, Toygun, Ogras, Umit
Format: Conference Proceeding
Language:English
Published: IEEE 26.07.2021
Subjects:
Batteries
Energy harvesting
Energy measurement
Power measurement
Time measurement
Transducers
Wearable computers
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Abstract Emerging flexible and stretchable devices open up novel and attractive applications beyond traditional rigid wearable devices. Since the small and flexible form-factor severely limits the battery capacity, energy harvesting (EH) stands out as a critical enabler of new devices. Despite increasing interest in recent years, the capacity of wearable energy harvesting remains unknown. Prior work analyzes the power generated by a single and typically rigid transducer. This choice limits the EH potential and undermines physical flexibility. Moreover, current results do not translate to total harvested energy over a given period, which is crucial from a developer perspective. In contrast, this paper explores the daily energy harvesting potential of combining flexible light and motion energy harvesters. It first presents a multi-modal energy harvesting system design whose inputs are flexible photo-voltaic cells and piezoelectric patches. We measure the generated power under various light intensity and gait speeds. Finally, we construct daily energy harvesting patterns of 9593 users by integrating our measurements with the activity data from the American Time Use Survey. Our results show that the proposed system can harvest on average 0. 6mAh @ 3. 6V per day.
AbstractList Emerging flexible and stretchable devices open up novel and attractive applications beyond traditional rigid wearable devices. Since the small and flexible form-factor severely limits the battery capacity, energy harvesting (EH) stands out as a critical enabler of new devices. Despite increasing interest in recent years, the capacity of wearable energy harvesting remains unknown. Prior work analyzes the power generated by a single and typically rigid transducer. This choice limits the EH potential and undermines physical flexibility. Moreover, current results do not translate to total harvested energy over a given period, which is crucial from a developer perspective. In contrast, this paper explores the daily energy harvesting potential of combining flexible light and motion energy harvesters. It first presents a multi-modal energy harvesting system design whose inputs are flexible photo-voltaic cells and piezoelectric patches. We measure the generated power under various light intensity and gait speeds. Finally, we construct daily energy harvesting patterns of 9593 users by integrating our measurements with the activity data from the American Time Use Survey. Our results show that the proposed system can harvest on average 0. 6mAh @ 3. 6V per day.
Author Basaklar, Toygun
Tuncel, Yigit
Ogras, Umit
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  givenname: Toygun
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  givenname: Umit
  surname: Ogras
  fullname: Ogras, Umit
  email: uogras@wisc.edu
  organization: University of Wisconsin-Madison,Department of ECE,Madison,WI
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SubjectTerms Batteries
Energy harvesting
Energy measurement
Power measurement
Time measurement
Transducers
Wearable computers
Title How Much Energy Can We Harvest Daily for Wearable Applications?
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