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A Study on the Energy Scavenging System Using Piezoelectric Effect  

Chio, Bum-Kyoo (서강대학교 기계공학과)
Lee, Je-Yun (서강대학교 기계공학과)
Lee, Woo-Hun (서강대학교 기계공학과)
Oh, Jae-Geun (서강대학교 기계공학과)
Publication Information
Journal of the Korean Society for Precision Engineering / v.25, no.2, 2008 , pp. 115-122 More about this Journal
Abstract
Mostly used sensors have wired powering and two-way cable systems. It is difficult to employ wired sensor network in ubiquitous era because of a number of sensors and cables. Therefore, sensor networks move from wired systems to wireless systems for the future. However, the power source is a critical obstacle for wireless sensornodes. This research represents the new power source which supplies energy sensor node, maintains over 10 years, and thus replaces batteries with limit of lifetime. The system with piezo materials scavenges extra energies such as vibration and acceleration from the environment. Then it converts the scavenged mechanical energy to electrical energy for powering a sensor, a controller and a circuit for regulating voltage and transmitting sensor value. This study explains the properties of piezo material through theoretical analysis and experiments, and demonstrates powering sensor and transmitting data with stored energy (35mJ) for 14 sec. The developed system provides a solution to overcome the critical problem of making up wireless sensor networks.
Keywords
Ubiquitous; Piezoelectric; Energy conversion system; Wireless sensor network;
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