Abstract:

To address the challenges of clean energy supply in complex environments,an acoustic-electric power system based on polyvinylidene fluoride (PVDF) piezoelectric films is proposed to achieve self-powering for low-power devices through efficient environmental acoustic energy harvesting and conversion.By analyzing the spectral characteristics of sound sources in high voltage substations,mountainous regions,marine environments,and rainy conditions,combined with the acoustic focusing effect of a sound concentrator and COMSOL acoustic simulations,the structure and layout of the acoustic-electric conversion array are optimized.The circuit design employs Schottky diode rectification,a 1 F supercapacitor for energy storage,and a TPS63900 voltage regulator chip to ensure stable power output.Results demonstrate that the proposed acoustic-electric conversion array with its optimal configuration enhances the collected sound pressure to 387.8% of the original emission pressure,efficiently capturing environmental acoustic energy within 10 Hz-20 kHz.The circuit design theoretically achieves a stable output of 1.8-5.0 V,effectively resolving acoustic energy fluctuations.Experimental validation in a laboratory environment with 40-45 dB sound pressure level (SPL) confirmed the prototype’s robust voltage output response across the primary audible frequency band.The design provides a novel solution for energy self-supply in specialized scenarios.Future work will focus on optimizing material and circuit efficiency to advance its large-scale applications.

Key words: environmental acoustic energy harvesting, acoustic-electric conversion, acoustic-electrical power supply, self-powered system