Low frequency acoustic energy harvester and the interface circuit

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Presentation transcript:

Low frequency acoustic energy harvester and the interface circuit Bin Li and Jeong Ho You Energy Harvesting Materials Lab Department of Mechanical Engineering Southern Methodist University

Objective: harvesting wasted acoustic energy (1)Abundant, clean and renewable (2)Intensive in urban life (2)Currently wasted (3)Low energy density Various sound sources

Vibration to electricity Approach Develop an acoustic energy harvester: Low audible operating frequency(about 100~200Hz) High efficiency AC/DC conversion Accumulated acoustic energy Vibration to electricity Quarter wavelength resonator Piezoelectric cantilevered plate External circuit

Total output voltage and power as a function of incident SPL Multiple piezo plates placed along the resonator Total output voltage and power as a function of incident SPL The number of plates to generate the maximum voltage and power is limited by the interruption of air particle motion. SPL: 100dB The summation of power:

Interface AC/DC conversion circuit design Piezo plates Electric power Pe flowing into the circuit Pe=Ieq×Vp Standard circuit Time Pe=Ieq×Vp Self-powered P- SSHI circuit Time Self-powered SSHI allow more electric power flowing into the circuit and improve AC/DC conversion efficiency by switching technology.

Harvested powers in our acoustic energy harvester Incident SPL: 112 dB Conclusions: Acoustic energy harvesting mechanism is developed at low operating frequency (100~200 Hz) using quarter-wavelength straight-tube resonator with multiple piezoelectric cantilever plates; The number of plates to generate the maximum voltage and power are limited by the interruption of acoustic air particle motion caused by the presence of plates; When the incident SPL is 112 dB, the simulated output power of the acoustic energy harvester is 2.9813mW using self-powered P-SSHI circuit.