Ultra low-power photovoltaic MPPT technique for indoor and outdoor wireless sensor nodes


Weddell, Alex, Merrett, Geoff and Al-Hashimi, Bashir (2011) Ultra low-power photovoltaic MPPT technique for indoor and outdoor wireless sensor nodes. At Design, Automation and Test in Europe (DATE), Grenoble, France, 14 - 18 Mar 2011. 4pp.

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Description/Abstract

Photovoltaic (PV) energy harvesting is commonly used to power wireless sensor nodes. To optimise harvesting efficiency, maximum power point tracking (MPPT) techniques are often used. Recently-reported techniques focus solely on outdoor applications, being too power-hungry for use under indoor lighting. Additionally, some techniques have required light sensors (or pilot cells) to control their operating point. This paper describes an ultra low-power MPPT technique which is based on a novel system design and sample-and-hold arrangement, which enables MPPT across the range of light intensities found indoors and outdoors and is capable of cold-starting. The proposed sample-and-hold based technique has been validated through a prototype system. Its performance compares favourably against state-of-the-art systems, and does not require an additional pilot cell or photodiode. This represents an important contribution, in particular for sensors which may be exposed to different types of lighting (such as body-worn or mobile sensors).

Item Type: Conference or Workshop Item (Speech)
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > EEE
Faculty of Physical Sciences and Engineering > Electronics and Computer Science > Electronic & Software Systems
ePrint ID: 271805
Date Deposited: 17 Dec 2010 10:06
Last Modified: 27 Mar 2014 20:17
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/271805

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