Dr Geoff V. Merrett
www.geoffmerrett.co.uk
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Two Papers Accepted for Publication in IEEE Transactions

26th September 2011

Our paper on supercapacitor modelling
Our paper on supercapacitor modelling
We have recently had two papers related to our work on Energy Harvesting electronics accepted for publication in the IEEE Transactions on Circuits and Systems. Both publications are a result of the EPSRC project on 'Holistic Energy Harvesting'.

The first paper, 'Accurate Supercapacitor Modeling for Energy-Harvesting Wireless Sensor Nodes' investigates supercapacitors, 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..

The second paper, 'Photovoltaic Sample-and-Hold Circuit Enabling MPPT Indoors for Low-Power Systems' presents an ultra low-power maximum power point tracking (MPPT) circuit with a novel sample-and-hold and cold-start arrangement, enabling efficient indoor MPPT (which has not been reported, or considered possible, before). The circuit is validated in practice, and the sample-and-hold behaviour analysed using real light data.

For more information, click here.
 

Other Articles

PRiME featured on Cover of New Electronics
14th October 2014
The PRiME Southampton Team
We were recently interviewed by the New Electronics magazine, who was interested in our research on the PRiME (Power and Reliability in Many-core Embedded systems) project. As a result, it was featured as a cover-story in the 14 October 2014 issue. Specifically to me, the article comments: A future challenge for many core systems is that application developers will face architectures that are changing all the time and it is unrealistic to expect them to alter their code constantly to deal ... [more]

D4 2012 (SAILORS): Football theme in an Olympic year
11th June 2012
One of the football-playing robots
Second-year Electronics students in ECS had a fittingly Olympic theme for this year's D4 design exercise, traditionally a very competitive culmination to practical work in the first two years. Student teams were set the challenge of building an intelligent robot capable of playing football without human input to take part in the fictional 'Robot Olympics'. The students had only three weeks to design, build, test, and demonstrate a complete electronic system. Pressure on the students was intense ... [more]

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