Abstract
With the rapid development of microelectronics technology, low-power electronic sensors have been widely applied in many fields, such as Internet of Things, aerospace, and so on. In this paper, a symmetrical ring-shaped piezoelectric energy harvester (SR-PEH) is designed to provide energy for the sensor to detect the ambient temperature. The finite element method is used by utilizing software COMSOL 5.4, and the electromechanical coupling model of the piezoelectric cantilever is established. The output performance equations are proposed; the microelectromechanical system (MEMS) integration process of the SR-PEH, circuit, and sensor is stated; and the changing trend of the output power density is explained from an energy perspective. In the logarithmic coordinate system, the results indicate that the output voltage and output power are approximately linear with the temperature when the resistance is constant. In addition, the growth rate of the output voltage and output power decreases with an increase of resistance under the condition of constant temperature. In addition, with an increase of temperature, the growth rate of the output power is faster than that of the output voltage. Furthermore, resistance has a more dramatic effect on the output voltage, whereas temperature has a more significant effect on the output power. More importantly, the comparison with the conventional cantilever-shaped piezoelectric energy harvester (CC-PEH) shows that the SR-PEH can improve the output performance and broaden the frequency band.
Highlights
With the progress of microelectronics technology, wireless sensor technology has practical applications in environmental monitoring, aerospace, and Internet of Things [1,2,3]
A comparison with other forms of energy harvesters shows that the piezoelectric energy harvester has the advantages of simple structure, no heat generation, higher output power, and no pollution to the environment [12]
The results indicated that the output voltage and output power of a segmented cantilever were higher than that of a conventional cantilever
Summary
With the progress of microelectronics technology, wireless sensor technology has practical applications in environmental monitoring, aerospace, and Internet of Things [1,2,3]. The output voltage of the connected cantilever was increased by 91.3% and 76.9%, respectively, as compared with the rectangular cantilever. Saxena designed four cantilever-type MEMS-based piezoelectric energy harvesters to power sensors that detected the health of a building [17]. The output performance of the harvester was tested by setting different cantilever structures. In order to comprehensively consider the advantages of rectangular cantilevers, segmented cantilevers, and array structures, in this paper, we propose a symmetrical ring-shaped piezoelectric energy harvester (SR-PEH) based on previous research results which can supply energy for a wireless sensor to detect ambient temperature. This research compares a conventional cantilever-shaped piezoelectric energy harvester (CC-PEH) with a SR-PEH and concludes that the SR-PEH has better output performance. This research has value as a particular reference for the design of a high-performance piezoelectric energy harvester
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