Abstract
Piezoelectric energy harvesting technology using the piezoelectric circular diaphragm (PCD) has drawn much attention because it has great application potential in replacing chemical batteries to power microelectronic devices. In this article, we have found a non-uniform strain distribution inside the PCD energy harvester. From the edge to the center of the ceramic disk, its output voltage first increases and then decreases. This uneven output voltage reduces the output power of the PCD energy harvester. Based on this phenomenon, we reduce the ceramic disk diameter and dig a hole in the center, analyzing the effect of removing the ceramic disk’s low output voltage part on the PCD energy harvester. The experimental results show that removing the ceramic disk’s low output voltage part can improve the output power, reduce the resonance frequency, and increase the optimal impedance of the PCD energy harvester. Under the conditions of 10 g proof mass, 9.8 m/s2 acceleration, the PCD energy harvester with a 19-mm diameter and a 6-mm hole can reach a maximum output power of 8.34 mW.
Highlights
In recent years, with the continuous progress of micro-machining, integrated circuits, and micro-electromechanical systems (MEMS), electronic devices’ design and manufacture are moving towards miniaturization, integration, and networking [1,2,3,4]
We introduce a piezoelectric circular diaphragm (PCD) energy harvester with a ring-shaped ceramic disk, this design can reduce the difference in output voltage between the outer and inner regions, which leads to a much more homogeneous output
The piezoelectric ceramic disk’s non-uniform deformation results in an uneven output voltage, it is the main problem existing in the PCD energy harvester
Summary
With the continuous progress of micro-machining, integrated circuits, and micro-electromechanical systems (MEMS), electronic devices’ design and manufacture are moving towards miniaturization, integration, and networking [1,2,3,4]. We introduce a PCD energy harvester with a ring-shaped ceramic disk, this design can reduce the difference in output voltage between the outer and inner regions, which leads to a much more homogeneous output
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