Abstract
This paper investigates the changes in the output of the piezoelectric cantilever arrays when connected in different configurations. In this research matching load resistance determined and optimum output was measured by connecting the piezoelectric cantilever arrays to resistance ranging from 10 Ω to 1 MΩ while excited by constant vibration source at frequency of 300 Hz and acceleration of 1-g level. The result shows that matching load resistance for one single piezoelectric cantilever is 13 KΩ. When two, three and four cantilevers are connected in series, the matching load resistance is 26 kΩ, 39 kΩ and 52 kΩ respectively. While in parallel connection, matching load resistance reduced to 6.5 kΩ, 4.5 kΩ and 3.5 kΩ for two, three, and four connected cantilevers respectively. In series configuration, the voltage output produced is much higher as compared to the piezoelectric cantilever arrays that are connected in parallel connection. The voltage output of the piezoelectric cantilever increased from 3.41V to 6.09V when it is connected in series configuration with same polarity. Whereas in term of power output, piezoelectric cantilever arrays in parallel configuration produce higher power output as compared to piezoelectric cantilever arrays in series connection. The maximum power increased from 272μW to 521μW when two cantilevers are connected in parallel configuration with same polarity.
Highlights
Current researches and applications areas for piezoelectric materials are vast
This paper investigates the changes in the output of the piezoelectric cantilever arrays when connected in different configurations
The result shows that when connected in series connection, the voltage output produced is much higher as compared to the piezoelectric cantilever arrays that are connected in parallel connection
Summary
Current researches and applications areas for piezoelectric materials are vast. The research stretches from the properties of piezoelectric materials, manufacturing, up to measurement techniques and practical applications; while in application wise, it is extended from sensor, actuator, transducer and micro-power generator [1,2,3]. Examples of the recent researches are the vibration-based MEMS piezoelectric energy harvester and power conditioning circuit which uses a MEMS piezoelectric power generator array for vibration energy harvesting [4]; wide-band energy harvesting using piezoelectric multi-cantilever which demonstrate the potential of improving the output of the piezoelectric when connected in alternating polarities [5]; and piezoelectric, solar and thermal energy harvesting for hybrid low-power generator systems with thin-film batteries which developed a hybrid power generator and storage system that has better functionality and robustness [6] It is expected in the near future, piezoelectric material could be the replacement of battery to create a sustainable system. Matching load resistances were identified to make sure optimum power was measured
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