The dynamic characteristics of harvesting energy from mechanical vibration via piezoelectric conversion

doi:10.1088/1674-1056/22/10/104502

Abstract As an alternative power solution for low-power devices, harvesting energy from the ambient mechanical vibration has received increasing research interest in recent years. In this paper we study the transient dynamic characteristics of a piezoelectric energy harvesting system including a piezoelectric energy harvester, a bridge rectifier, and a storage capacitor. To accomplish this, this energy harvesting system is modeled, and the charging process of the storage capacitor is investigated by employing the in-phase assumption. The results indicate that the charging voltage across the storage capacitor and the gathered power increase gradually as the charging process proceeds, whereas the charging rate slows down over time as the charging voltage approaches to the peak value of the piezoelectric voltage across the piezoelectric materials. In addition, due to the added electrical damping and the change of the system natural frequency when the charging process is initiated, a sudden drop in the vibration amplitude is observed, which in turn affects the charging rate. However, the vibration amplitude begins to increase as the charging process continues, which is caused by the decrease in the electrical damping (i.e., the decrease in the energy removed from the mechanical vibration). This electromechanical coupling characteristic is also revealed by the variation of the vibration amplitude with the charging voltage.

Keywords: piezoelectric conversion mechanical vibration charging dynamics electromechanical coupling

Received: 18 December 2012
Revised: 01 April 2013
Accepted manuscript online:

PACS:	45.20.dg	(Mechanical energy, work, and power)
	46.70.De	(Beams, plates, and shells)
	68.35.Gy	(Mechanical properties; surface strains)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10476019) and the Fundamental Research Funds for the Central Universities (Grant No. K5051304011).

Corresponding Authors: Fan Kang-Qi
E-mail: kangqifan@gmail.com

Cite this article:

Fan Kang-Qi (樊康旗), Ming Zheng-Feng (明正峰), Xu Chun-Hui (徐春辉), Chao Feng-Bo (晁锋波) The dynamic characteristics of harvesting energy from mechanical vibration via piezoelectric conversion 2013 Chin. Phys. B 22 104502

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The dynamic characteristics of harvesting energy from mechanical vibration via piezoelectric conversion

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