DocumentCode :
1140853
Title :
Efficient Charging of Supercapacitors for Extended Lifetime of Wireless Sensor Nodes
Author :
Simjee, Farhan I. ; Chou, Pai H.
Author_Institution :
Eur. Aeronaut. Defence & Space Co. (EADS), Schiphol-Rijk
Volume :
23
Issue :
3
fYear :
2008
fDate :
5/1/2008 12:00:00 AM
Firstpage :
1526
Lastpage :
1536
Abstract :
This paper describes an efficient charging method for a supercapacitor-operated, solar-powered wireless sensor node called Everlast. Unlike traditional wireless sensors that store energy in batteries, Everlast´s use of supercapacitors enables the system to operate for an estimated lifetime of 20 years without any maintenance. The novelty of this system lies in the feed-forward, pulse frequency modulated converter and open-circuit solar voltage method for maximum power point tracking (MPPT), enabling the solar cell to efficiently charge the supercapacitor and power the node. Experimental results show that by its low-complexity MPPT, Everlast can achieve over 89% conversion efficiency with lower power overhead than the state-of-the-art by two orders of magnitude, while enabling charging a supercapacitor up to 400% faster than direct charging. This makes Everlast particularly applicable to miniature-scale, high-impedance energy harvesting systems.
Keywords :
solar power; supercapacitors; telecommunication power supplies; wireless sensor networks; Everlast; batteries; high-impedance energy harvesting systems; maximum power point tracking; open-circuit solar voltage method; pulse frequency modulated conve; solar-powered wireless sensor node; supercapacitors charging; wireless sensor nodes; Energy harvesting; maximum power point tracking (MPPT); solar power; supercapacitor; wireless sensor node (WSN);
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2008.921078
Filename :
4494753
Link To Document :
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