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Two-layered piezoelectric bender device for micro-power generator
Abstract:In this study, we investigated the possibility of use of bender type piezoelectric devices. To match the external vibration frequency with the device resonant frequency, the various devices with different resonant frequency were chosen. The two-layered device consists of different thick layers, in which each layer shows different resonant frequency. The highest power was obtained under optimization of the capacitive nature of piezoelectric device which is connected to small storage capacitor and its impedance matching by selection of suitable resistive load. Under an external vibration acceleration of 0.1G at 120 Hz, the device exhibited a peak-to-peak voltage of 2.0V and a power of 0.5mW in resonance mode.
Keywords:Piezoelectric ceramics Bender device Micro-power harvesting
Introduction
Wearable and ubiquitous micro systems will be greatly growing and their related devices should be self-powered in order to avoid the replacement of finite power sources, for example,by scavenging energy from the environment. With ever reducing power requirements of electronic circuits, power scavenging approaches are in reality. One approach is to drive an electromechanical converter from ambient motion or vibration.Vibration-driven generators based on electromagnetic,electrostatic and piezoelectric technologies have been demonstrated. Although some of the generators have already been fabricated and evaluated, their performances are behind the requirements of self-powered system. Among various generator types proposed so far, piezoelectric generator possesses considerable potential in micro system. In the system, piezoelectric device exhibits high voltage and power at a specific frequency where its resonant frequency accounts for vibrational natural frequency for achieving high efficiency in transforming from external mechanical vibration energy into electric energy.
To enhance mechanical-to-electric energy c
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