The acoustic energy harvesting based on the piezoelectric effect

The effect of power output of the PZT-metal composite disc bender was studied in this article, when the disc was under the effect of sound field. The piezoelectric ceramic in a clamping state was placed in the sound field which was single-frequency steady-state sine wave. Under the excitation, the piezoelectric ceramic was deformed. The results show that the output voltage and power of the device were maximum at the resonance frequency. In the sinusoidal sound field, the output voltage of the piezoelectric disc bender was up to 4.62 V in open circuit when the acoustic frequency was 907 Hz. Under a sound pressure of 110 dB, the power of 60.4 μW was obtained across a resistance load of 11.2 kΩ.