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Photovoltaic Energy Harvesting Wireless Sensor Node for Telemetry Applications Optimized for Low Illumination Levels
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
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2016 (English)In: ELECTRONICS, ISSN 2079-9292, Vol. 5, no 2, 26Article in journal (Refereed) PublishedText
Abstract [en]

This paper reports the design of a photovoltaic energy harvesting device used as a telemetry node in wireless sensor networks. The device draws power from the small solar cell, stores it into the primary energy buffer and backup supercapacitor, collects measured data from various sensors and transmits them over low power radio link at 868 MHz. Its design ensures reliable cold booting under very poor illumination conditions (down to 20 lx). The solar cell also enables indirect illumination level detection for the subcircuit that manages stored energy (day/night detector). The device is allowed to draw power from the backup supercapacitor only when it is not possible to gather enough energy from the solar cell during the sleep period. Short lasting and sudden drops of the illumination do not activate the backup power supply. A wireless sensor node design is adjusted to the proposed photovoltaic harvesting circuitry, so the overall power consumption in the sleep mode is less than 25 W. Also, due to adaptive power consumption, proposed device topology ensures its autonomy time in the total darkness of 81 h. The device has been produced using commercially available components enabling versatile telemetric functionality by the implementation of different sensors.

Place, publisher, year, edition, pages
MDPI AG , 2016. Vol. 5, no 2, 26
Keyword [en]
photovoltaic energy harvesting, low illumination level, telemetry node, wireless sensor network (WSN)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-190569DOI: 10.3390/electronics5020026ISI: 000380002600013ScopusID: 2-s2.0-84973867066OAI: diva2:953805

QC 20160818

Available from: 2016-08-18 Created: 2016-08-12 Last updated: 2016-08-18Bibliographically approved

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Nesic, Damir
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Electrical Engineering, Electronic Engineering, Information Engineering

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