Characteristics of Power Generation from PVDF Piezoelectric Film

The characteristics of power generation of high polymer polyvinylidene fluoride(PVDF) piezoelectric film were studied. The mechanism of piezoelectric generating power was analyzed in theory. The relationship of the generating power with oscillatory frequency and external resistor was derived and found that, under a fixed frequency, the output power could reach a maximum when the external resistor was a particular value. Experiments have verified above result. Moreover, parallel and series configurations of the piezoelectric film could increase output voltage when external resistance value is within a certain range. For the case that the free vibration can't be achieved by restricted installation, the pre-deformation of piezoelectric film under non-free vibration condition also could improve the output voltage.