Title :
A self-powered power management circuit for energy harvested by a piezoelectric cantilever
Author :
Kong, Na ; Cochran, Travis ; Ha, Dong Sam ; Lin, Hung-Chih ; Inman, Daniel J.
Author_Institution :
Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
This paper presents development of a self-powered power management circuit for energy harvested by a piezoelectric cantilever. A full-wave rectifier followed by a buck-boost converter running in the discontinuous conduction mode rectifies the AC output, matches the source impedance, and generates a regulated DC output provided the input power is sufficient to charge up the load. A low power microcontroller unit is used for the maximum power point tracking and the output voltage regulation. Experimental results show that the circuit can harvest up to 3.5 mW with a 50 × 31.8 mm2 piezoelectric cantilever under 0.5 g (rms) base acceleration. Detailed loss analysis is presented for efficiency enhancement in the future.
Keywords :
cantilevers; energy harvesting; low-power electronics; microcontrollers; piezoelectric devices; power convertors; power supply circuits; rectifying circuits; AC output; DC output; buck-boost converter; discontinuous conduction mode; full-wave rectifier; loss analysis; low power microcontroller unit; maximum power point tracking; output voltage regulation; piezoelectric cantilever; power 3.5 mW; self-powered power management circuit; source impedance; AC generators; Analog-digital conversion; Circuits; DC generators; Energy management; Impedance matching; Microcontrollers; Power generation; Rectifiers; Voltage control; Energy harvesting; Piezoelectric cantilever; Power management circuit;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2010 Twenty-Fifth Annual IEEE
Conference_Location :
Palm Springs, CA
Print_ISBN :
978-1-4244-4782-4
Electronic_ISBN :
1048-2334
DOI :
10.1109/APEC.2010.5433535
