Photovoltaic sample-and-hold circuit enabling MPPT indoors for low-power systems


Weddell, Alex S., Merrett, Geoff V. and Al-Hashimi, Bashir M. (2011) Photovoltaic sample-and-hold circuit enabling MPPT indoors for low-power systems. IEEE Transactions on Circuits and Systems I: Regular Papers, 59, (6), 1196-1204. (doi:10.1109/TCSI.2011.2173393).

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Original Publication URL: http://www.holistic.ecs.soton.ac.uk/

Description/Abstract

Photovoltaic (PV) energy harvesting is commonly used to power autonomous devices, and maximum power point tracking (MPPT) is often used to optimize its efficiency. This paper describes an ultra low-power MPPT circuit with a novel sample-and-hold and cold-start arrangement, enabling MPPT across the range of light intensities found indoors, which has not been reported before. The circuit has been validated in practice and found to cold-start and operate from 100 lux (typical of dim indoor lighting) up to 5000 lux with a 55cm2 amorphous silicon PV module. It is more efficient than non-MPPT circuits, which are the state-of-the-art for indoor PV systems. The proposed circuit maximizes the active time of the PV module by carrying out samples only once per minute. The MPPT control arrangement draws a quiescent current draw of only 8uA, and does not require an additional light sensor as has been required by previously-reported low-power MPPT circuits.

Item Type: Article
ISSNs: 1549-8328 (print)
1558-0806 (electronic)
Related URLs:
Keywords: maximum power point tracking, photovoltaics, energy harvesting
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > Electronic & Software Systems
ePrint ID: 272832
Date Deposited: 23 Sep 2011 10:55
Last Modified: 27 Mar 2014 20:18
Research Funder: EPSRC
Projects:
Next Generation Energy-Harvesting Electronics - holistic approach 1763
Funded by: EPSRC (EP/G067740/1)
Led by: Bashir M. Al-Hashimi
1 October 2009 to 31 March 2013
Publisher: IEEE Circuits and Systems Society
Contact Email Address: asw@ecs.soton.ac.uk
Further Information:Google Scholar
ISI Citation Count:0
URI: http://eprints.soton.ac.uk/id/eprint/272832

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