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Energies 2014, 7(10), 6323-6339; doi:10.3390/en7106323

Powering-up Wireless Sensor Nodes Utilizing Rechargeable Batteries and an Electromagnetic Vibration Energy Harvesting System

1
Department of Electrical and Electronics Engineering, Middle East Technical University, Ankara 06400, Turkey
2
Middle East Technical University-Micro Electro-Mechanical Systems (METU-MEMS) Research and Applications Center, Middle East Technical University, Ankara 06400, Turkey
*
Author to whom correspondence should be addressed.
Received: 9 June 2014 / Revised: 29 August 2014 / Accepted: 1 September 2014 / Published: 2 October 2014
(This article belongs to the Special Issue Green IT and IT for Smart Energy Savings)
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Abstract

This paper presents a wireless sensor node (WSN) system where an electromagnetic (EM) energy harvester is utilized for charging its rechargeable batteries while the system is operational. The capability and the performance of an in-house low-frequency EM energy harvester for charging rechargeable NiMH batteries were experimentally verified in comparison to a regular battery charger. Furthermore, the power consumption of MicaZ motes, used as the WSN, was evaluated in detail for different operation conditions. The battery voltage and current were experimentally monitored during the operation of the MicaZ sensor node equipped with the EM vibration energy harvester. A compact (24.5 cm3) in-house EM energy harvester provides approximately 65 µA charging current to the batteries when excited by 0.4 g acceleration at 7.4 Hz. It has been shown that the current demand of the MicaZ mote can be compensated for by the energy harvester for a specific low-power operation scenario, with more than a 10-fold increase in the battery lifetime. The presented results demonstrate the autonomous operation of the WSN, with the utilization of a vibration-based energy harvester. View Full-Text
Keywords: autonomous wireless sensor node; MicaZ; energy harvesting; electromagnetic energy harvester; rechargeable battery autonomous wireless sensor node; MicaZ; energy harvesting; electromagnetic energy harvester; rechargeable battery
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Chamanian, S.; Baghaee, S.; Ulusan, H.; Zorlu, Ö.; Külah, H.; Uysal-Biyikoglu, E. Powering-up Wireless Sensor Nodes Utilizing Rechargeable Batteries and an Electromagnetic Vibration Energy Harvesting System. Energies 2014, 7, 6323-6339.

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