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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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.
|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
|Date Deposited:||23 Sep 2011 10:55|
|Last Modified:||26 Apr 2013 05:16|
|Publisher:||IEEE Circuits and Systems Society|
|Contact Email Address:||firstname.lastname@example.org|
|Further Information:||Google Scholar|
|ISI Citation Count:||0|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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