Experimental study on self-powered synchronized switch harvesting on inductor circuits for multiple piezoelectric plates in acoustic energy harvesting

Abstract

Self-powering mechanisms for synchronized switch harvesting on inductor circuits have been experimentally investigated to harvest low-frequency acoustic energy (∼200 Hz) using multiple lead zirconate titanate piezoelectric plates placed inside a quarter-wavelength straight-tube resonator. Unlike conventional synchronized switch harvesting on inductor circuits, the self-powered synchronized switch harvesting on inductor circuits can perform alternating current/direct current conversion without externally powered switch controllers, which is beneficial in real applications. In the acoustic energy harvester, the nonuniform driving force to piezoelectric plates generates the asynchronous charging effect in piezoelectric internal capacitances. Due to more energy dissipative components in the self-powered synchronized switch harvesting on inductor circuits, there exists a critical voltage above which the self-powered synchronized switch harvesting on inductor circuits outperform the standard circuit. With the incident sound pressure level of 112 dB at the frequency of 196 Hz, the output power of self-powered series-synchronized switch harvesting on inductor using three piezoelectric plates is measured as 0.796 mW. This is 13.2% higher than the standard circuit.

Keywords

Acoustic energy harvesting multiple piezoelectric cantilever plates self-powered synchronized switch harvesting on inductor nonlinear alternating current/direct current conversion

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