Vibration-based energy harvesters have become significantly popular due to growing demand of electronic devices and a wireless sensor which, demand miniature, portable, long lasting and easily recharged source of power.
Use of conventional batteries is an unacceptable solution to power up the densely populated nodes of devices due to their bulky sizes and high battery replacement cost. This work reports the design and analysis of piezoelectric energy harvester which, can be harvested using the ambient vibration in kHz range.
The health and environmental concern on the toxicity of PZT drive the great interest of scientist and engineers in finding the new replacement to lead-based materials which, has dominated the vast majority of piezoelectric devices. KNN has been reported to be an excellent choice for lead-free piezoelectric application due to high electromechanical coupling factor, piezoelectric coefficient, and highest dielectric properties.
Based on the result, the output voltage of the KNN system was significantly optimized at0.96871 V with working frequency of 2.93 kHz and power of 0.104 mW. Comparatively, commercialised PZT with similar geometry to that KNN recorded the maximum voltage and power output of 1.003 V and 0.111 mW.
The obtained data shows that the performance of KNN system is closely matched to that PZT harvester which has good futuristic possibility to replace PZT and can be applied in wireless sensor network.
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