Mr. H. C. Chang Profile

H. C. Chang

at National Taiwan Univ

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Proceedings Article | 21 March 2019 Paper

An SECE-based piezoelectric power harvesting induced by rotary magnetic plucking

P. H. Huang, H. C. Chang, Y. C. Shu, T. T. Hsieh

Proceedings Volume 10967, 109670F (2019) https://doi.org/10.1117/12.2513818

KEYWORDS: Magnetism, Switches, Energy harvesting, Interfaces, Switching, Oscillators, Sensors, Zirconium

Read Abstract +

This work documents both modeling and experimental studies of rotary magnetic plucking dynamics in a piezoelectric energy harvester connected to an SECE (synchronized electric charge extraction) interface circuit. The device consists of a piezoelectric cantilever beam fixed on a stationary base and attached to an SECE circuit. A tip magnet is excited by a driving magnet on a rotating host. Energy is therefore harvested by vibration of the beam induced by non-contact magnetic plucking and is enhanced by the SECE circuit technique. In addition, the analytic estimate of harvested power is derived and shows that the device exhibits the phenomenon of frequency up-conversion. The crests and troughs of ripples in the rotatory power frequency response are predicted and are found in good agreement with experiment. Finally, the harvested peak power based on the SECE interface circuit is observed to be twice higher than that based on the conventional standard interface circuit.

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