Digest of "Autonomous Power Supply System for Light Sensor of Illumination Measurement Test Bench"

Olegs Tetervenoks, Ilya Galkin, Jelena Armas

Abstract


Usually wireless devices require autonomous power supply. They are equipped with radio frequency transceiver modules with relatively high energy consumption especially in data transmission mode. This also means that autonomous power supply of wireless device requires relatively large energy storage. Rechargeable battery in this case is a good solution, but the charging process of a battery takes a long time. In this paper the use of supercapacitor as energy storage for autonomous power supply of wireless node is further elaborated on the example of light sensor for illumination measurement test bench. The evaluation of the results has shown that the main criterion for improving energy efficiency and increasing the operating time of the wireless node powered from supercapacitor is the optimal algorithm of the device, which involves minimal use of the RF transceiver. It is also necessary to maximize usage of power-saving modes of individual nodes.  With the use of supercapacitor the charging time of energy storage of the prototype of light sensor for the test bench has been reduced. The optimized algorithm extended the operation time. Assessment of life cycle costs showed that the use of the ultracapacitors as energy storage for wireless device can be economically profitable in long time. The limitations of such systems are volume of capacitors, self discharge process and limitations on the use under high temperature conditions.

Keywords:

Lighting; optical variables measurement; wireless sensor networks; energy storage; supercapacitors

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Developed by Institute of Industrial Electronics and Electrical Engineering of RIGA TECHNICAL UNIVERSITY