A vibration-based MEMS piezoelectric energy harvester and power conditioning circuit.
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An efficient autonomous power conditioning circuit, with the function of impedance matching, energy storage and voltage regulation, is presented, finding that the efficiency of the energy storage is greatly improved and up to 64.95%.Abstract:
This paper presents a micro-electro-mechanical system (MEMS) piezoelectric power generator array for vibration energy harvesting. A complete design flow of the vibration-based energy harvester using the finite element method (FEM) is proposed. The modal analysis is selected to calculate the resonant frequency of the harvester, and harmonic analysis is performed to investigate the influence of the geometric parameters on the output voltage. Based on simulation results, a MEMS Pb(Zr,Ti)O3 (PZT) cantilever array with an integrated large Si proof mass is designed and fabricated to improve output voltage and power. Test results show that the fabricated generator, with five cantilever beams (with unit dimensions of about 3 × 2.4 × 0.05 mm3) and an individual integrated Si mass dimension of about 8 × 12.4 × 0.5 mm3, produces a output power of 66.75 μW, or a power density of 5.19 μW∙mm-3∙g-2 with an optimal resistive load of 220 kΩ from 5 m/s2 vibration acceleration at its resonant frequency of 234.5 Hz. In view of high internal impedance characteristic of the PZT generator, an efficient autonomous power conditioning circuit, with the function of impedance matching, energy storage and voltage regulation, is then presented, finding that the efficiency of the energy storage is greatly improved and up to 64.95%. The proposed self-supplied energy generator with power conditioning circuit could provide a very promising complete power supply solution for wireless sensor node loads.read more
Citations
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References
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A study of low level vibrations as a power source for wireless sensor nodes
TL;DR: The goal of this paper is not to suggest that the conversion of vibrations is the best or most versatile method to scavenge ambient power, but to study its potential as a viable power source for applications where vibrations are present.
BookDOI
Energy Harvesting Technologies
Shashank Priya,Daniel J. Inman +1 more
TL;DR: Energy Harvesting Technologies as mentioned in this paper provides a cohesive overview of the fundamentals and current developments in the field of energy harvesting, as well as theory and design rules required for fabrication of efficient electronics, and recent findings in thermoelectric energy harvesting systems.
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Improving power output for vibration-based energy scavengers
Shad Roundy,Eli S. Leland,Jessy Baker,Eric Carleton,Elizabeth K. Reilly,E. Lai,Brian Otis,Jan M. Rabaey,Paul K. Wright,V. Sundararajan +9 more
TL;DR: This paper modeled, designed, and built small cantilever-based devices using piezoelectric materials that can scavenge power from low-level ambient vibration sources, and presents some new designs that can be tuned to the frequency of the host surface, thereby expanding the method's flexibility.
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MEMS power generator with transverse mode thin film PZT
TL;DR: In this paper, a cantilever device is designed to have a flat structure with a proof mass added to the end to create electrical energy via the piezoelectric effect.
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Optimized piezoelectric energy harvesting circuit using step-down converter in discontinuous conduction mode
TL;DR: In this paper, an optimized method of harvesting vibrational energy with a piezoelectric element using a step-down DC-DC converter is presented, in which the converter regulates the power flow from the PPE element to the desired electronic load.
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