Self-powered SECE-based piezoelectric energy harvesting for sensor supply under shock excitations

Y. C. Lo; P. H. Huang; Y. C. Shu

doi:10.1117/12.2557998

22 April 2020 Self-powered SECE-based piezoelectric energy harvesting for sensor supply under shock excitations

Y. C. Lo, P. H. Huang, Y. C. Shu

Proceedings Volume 11376, Active and Passive Smart Structures and Integrated Systems XIV; 1137609 (2020) https://doi.org/10.1117/12.2557998
Event: SPIE Smart Structures + Nondestructive Evaluation, 2020, Online Only

Abstract

The article presents the study of a novel self-powered SECE (synchronized electric charge extraction) circuit for scavenging piezoelectric energy under low-frequency shock excitation. Specifically, the device consists of a piezoelectric cantilever beam whose tip magnet is impulsively excited by a rotating magnet. It is attached to a load-independent SECE circuit with the advantage of power enhancement at low-level output voltage. The proposed circuit includes an envelope detector for voltage detection, a voltage divider for minimizing the switching delay and a diode for recovering the charge on the detection capacitance. The result shows that the predicted harvested power agrees well with the experimental observations. In addition, the power ripples are significantly reduced due to the larger electric-induced damping drawn from the SECE technique. Finally, the load-independent property makes the observed SECE power remain constant within the output voltage operated at around 2-5 volt, and therefore outperforms the standard DC power.

Conference Presentation

Citation Download Citation

Y. C. Lo, P. H. Huang, and Y. C. Shu "Self-powered SECE-based piezoelectric energy harvesting for sensor supply under shock excitations", Proc. SPIE 11376, Active and Passive Smart Structures and Integrated Systems XIV, 1137609 (22 April 2020); https://doi.org/10.1117/12.2557998

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