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Accurate Supercapacitor Modeling for Energy-Harvesting Wireless Sensor Nodes

Weddell, A., Merrett, G., Kazmierski, T. and Al-Hashimi, B. (2011) Accurate Supercapacitor Modeling for Energy-Harvesting Wireless Sensor Nodes. IEEE Transactions on Circuits and Systems II: Express Briefs . (In Press)

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Abstract

Supercapacitors are often used in energy-harvesting wireless sensor nodes (EH-WSNs) to store harvested energy. Until now, research into the use of supercapacitors in EH-WSNs has considered them to be ideal or over-simplified, with non-ideal behavior attributed to substantial leakage currents. In this brief, we show that observations previously attributed to leakage are predominantly due to redistribution of charge inside the supercapacitor. We confirm this hypothesis through the development of a circuit-based model which accurately represents non-ideal behavior. The model correlates well with practical validations representing the operation of an EH-WSN, and allows behavior to be simulated over long periods.

Item Type:Article
Creator/Authors:
Alex Weddell
Geoff Merrett
Tom Kazmierski
Bashir Al-Hashimi
Keywords:energy harvesting, supercapacitor modeling, system simulation, wireless sensor networks, supercapacitor leakage
Research Group:Current ECS Groups > Electronic and Software Systems
Current ECS Groups > Electronics and Electrical Engineerineering
Old ECS Groups > Pervasive System Centre
Old ECS Groups > Electronic Systems and Devices Group
Date:22 September 2011
Information about this record:
Performance Indicator:EZ~04~04~11
Citations:
ID Code:22829
Last Modified:23 Sep 2011 10:42
Deposited On:22 Sep 2011 12:37 by Weddell, Alex

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References in Article

Select the SEEK icon to attempt to find the referenced article. If it does not appear to be in this archive you will be forwarded to the paracite service. Poorly formated references will probably not work.

[1] Panasonic Industrial Company, “Gold Capacitors Technical Guide,” http://www.panasonic.com/industrial/electronic-components/capacitiveproducts/gold-cap-electric.aspx, 2005, last accessed May 2010.

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[5] G. Merrett, A. Weddell, A. Lewis, N. Harris, B. Al-Hashimi, and N. White, “An empirical energy model for supercapacitor powered wireless sensor nodes,” in Proc. Int. Conf. Comput. Commun. and Networks, 2008, pp. 1–6.

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[13] L. Wang, T. Kazmierski, B. Al-Hashimi, A. Weddell, G. Merrett, and I. A. Garcia, “Accelerated simulation of tunable vibration energy harvesting systems using a linearised state-space technique,” in Proc. Design, Automation and Test in Europe, 2011, pp. 1267–1272.

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