Designing a hybrid energy-efficient harvesting system for head- or wrist-worn healthcare wearable devices
Battery power is crucial for wearable devices as it ensures continuous operation, which is critical for real-time health monitoring and emergency alerts. One solution for long-lasting monitoring is energy harvesting systems. Ensuring a consistent energy supply from variable sources for reliable devi...
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| Hauptverfasser: | , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
12 August 2024
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| In: |
Sensors
Year: 2024, Jahrgang: 24, Heft: 16, Pages: 1-18 |
| ISSN: | 1424-8220 |
| DOI: | 10.3390/s24165219 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.3390/s24165219 Verlag, kostenfrei, Volltext: https://www.mdpi.com/1424-8220/24/16/5219 
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| Verfasserangaben: | Zahra Tohidinejad, Saeed Danyali, Majid Valizadeh, Ralf Seepold, Nima TaheriNejad and Mostafa Haghi |
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| 520 | |a Battery power is crucial for wearable devices as it ensures continuous operation, which is critical for real-time health monitoring and emergency alerts. One solution for long-lasting monitoring is energy harvesting systems. Ensuring a consistent energy supply from variable sources for reliable device performance is a major challenge. Additionally, integrating energy harvesting components without compromising the wearability, comfort, and esthetic design of healthcare devices presents a significant bottleneck. Here, we show that with a meticulous design using small and highly efficient photovoltaic (PV) panels, compact thermoelectric (TEG) modules, and two ultra-low-power BQ25504 DC-DC boost converters, the battery life can increase from 9.31 h to over 18 h. The parallel connection of boost converters at two points of the output allows both energy sources to individually achieve maximum power point tracking (MPPT) during battery charging. We found that under specific conditions such as facing the sun for more than two hours, the device became self-powered. Our results demonstrate the long-term and stable performance of the sensor node with an efficiency of 96%. Given the high-power density of solar cells outdoors, a combination of PV and TEG energy can harvest energy quickly and sufficiently from sunlight and body heat. The small form factor of the harvesting system and the environmental conditions of particular occupations such as the oil and gas industry make it suitable for health monitoring wearables worn on the head, face, or wrist region, targeting outdoor workers. | ||
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