Study on piezoelectric ceramic under different pressurization conditions and circuitry

The fluctuating force from the dynamic system applied to the piezoelectric material gives electric energy as an output. In the present work, the effect of pressurizing the diaphragm type piezoelectric elements at the same time and at a different time (depicting the condition of in-phase and out-of-phase) has been studied. Furthermore, to combine the outputs, the use of series and parallel circuitry has been studied before the rectification (AC to DC) and after the rectification. The material of the piezoelectric used in the experiments was lead zirconate titanate (PZT). The maximum power output of 362.8 µW is obtained when the two piezoelectric elements were pressurized in-phase by a cyclic force of amplitude 400 mA and 17 Hz frequency, their signals rectified and then combined through the parallel circuit. The high power output is at the natural frequency of the mechanical system.