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Estimation of the dynamic leakage current of a supercapacitor in energy harvesting powered autonomous wireless sensor nodes

Yue, Xicai; Kiely, Janice; Farooq, Abdul; Champneys, Alan

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Authors

Alex Yue Alex.Yue@uwe.ac.uk
Senior Lecturer in Bioinstrumentation and Sensor Interfacing

Janice Kiely

Abdul Farooq

Alan Champneys



Abstract

© 2017 IEEE. The supercapacitor is a candidate energy storage component for energy harvesting powered autonomous wireless sensor node aiming to achieve battery replacement-free, 'fit and forget' sensor node in low-power IoT applications. The leakage current of the supercapacitor provided by the manufacturer is tested long after post-charge, raising a concern relating to the uncertainty of the dynamic leakage current in the IoT applications where the supercapacitor frequently charges and discharges. This paper investigates the charge redistribution process which causes an equivalent capacitance change of the supercapacitor in a full IoT measurement period, and then proposes an experiment design to measure the dynamic leakage current of a supercapacitor for an IoT application. The results showed that the charge redistribution process is completed long before the end of the sleep period due to the low ratio of the amount of discharge in an active period to the total amount of charge the supercapacitor holds. It also showed that the average dynamic leakage current in an entire measurement period corresponds to the value provided by the manufacturer, indicating that leakage current is not an issue when supercapacitors is used for low-power IoT applications.

Citation

Yue, X., Kiely, J., Farooq, A., & Champneys, A. (2017). Estimation of the dynamic leakage current of a supercapacitor in energy harvesting powered autonomous wireless sensor nodes. Intelec, 2017-October, 278-281. https://doi.org/10.1109/INTLEC.2017.8214147

Journal Article Type Conference Paper
Conference Name 2017 IEEE International Telecommunications Energy Conference (INTELEC)
Start Date Oct 22, 2017
End Date Oct 26, 2017
Acceptance Date Aug 4, 2017
Online Publication Date Dec 18, 2017
Publication Date Dec 18, 2017
Deposit Date Sep 26, 2017
Publicly Available Date Jan 19, 2018
Journal INTELEC, International Telecommunications Energy Conference (Proceedings)
Print ISSN 0275-0473
Peer Reviewed Peer Reviewed
Volume 2017-October
Pages 278-281
ISBN 9781538610190
DOI https://doi.org/10.1109/INTLEC.2017.8214147
Keywords supercapacitor, leakage current, charge redistribution, IoT
Public URL https://uwe-repository.worktribe.com/output/904138
Publisher URL http://dx.doi.org/10.1109/INTLEC.2017.8214147
Additional Information Title of Conference or Conference Proceedings : 2017 IEEE International Telecommunications Energy Conference (INTELEC)

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