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The Scientific World Journal
Volume 2014, Article ID 484381, 8 pages
http://dx.doi.org/10.1155/2014/484381
Research Article

Capacitance-Based Frequency Adjustment of Micro Piezoelectric Vibration Generator

1School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
2Henan Institute of Science and Technology, Xinxiang 453003, China

Received 24 April 2014; Accepted 24 June 2014; Published 15 July 2014

Academic Editor: Wenming Zhang

Copyright © 2014 Xinhua Mao et al. 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.

Abstract

Micro piezoelectric vibration generator has a wide application in the field of microelectronics. Its natural frequency is unchanged after being manufactured. However, resonance cannot occur when the natural frequencies of a piezoelectric generator and the source of vibration frequency are not consistent. Output voltage of the piezoelectric generator will sharply decline. It cannot normally supply power for electronic devices. In order to make the natural frequency of the generator approach the frequency of vibration source, the capacitance FM technology is adopted in this paper. Different capacitance FM schemes are designed by different locations of the adjustment layer. The corresponding capacitance FM models have been established. Characteristic and effect of the capacitance FM have been simulated by the FM model. Experimental results show that the natural frequency of the generator could vary from 46.5 Hz to 42.4 Hz when the bypass capacitance value increases from 0 nF to 30 nF. The natural frequency of a piezoelectric vibration generator could be continuously adjusted by this method.