Improved Multilayered (Bi,Sc)O3-(Pb,Ti)O3 Piezoelectric Energy Harvesters Based on Impedance Matching Technique

Sensors

Sung-Jin Kim¹  Jae-Hoon Ji²  Hong-Tae Kim²  BoSu Kim²  Jung-Hyuk Koh² 

[1] College of Electrical and Computer Engineering, Chungbuk National University, Cheongju 361-763, Korea;School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 06974, Korea;

关键词: (Bi,Sc)O₃-(Pb,Ti)O₃ ceramics;    piezoelectric ceramics;    impedance matching;   

DOI  :  10.3390/s20071958

来源: DOAJ

【 摘 要 】

As a piezoelectric material, (Bi,Sc)O₃-(Pb,Ti)O₃ ceramics have been tested and analyzed for sensors and energy harvester applications owing to their relatively high Curie temperature and high piezoelectric coefficient. In this work, we prepared optimized (Bi,Sc)O₃-(Pb,Ti)O₃ piezoelectric materials through the conventional ceramic process. To increase the output energy, a multilayered structure was proposed and designed, and to obtain the maximum output energy, impedance matching techniques were considered and tested. By varying and measuring the energy harvesting system, we confirmed that the output energies were optimized by varying the load resistance. As the load resistance increased, the output voltage became saturated. Then, we calculated the optimized output power using the electric energy formula. Consequently, we identified the highest output energy of 5.93 µW/cm² at 3 MΩ for the quadruple-layer harvester and load resistor using the impedance matching system. We characterized and improved the electrical properties of the piezoelectric energy harvesters by introducing impedance matching and performing the modeling of the energy harvesting component. Modeling was conducted for the piezoelectric generator component by introducing the mechanical force dependent voltage sources and load resistors and piezoelectric capacitor connected in parallel. Moreover, the generated output voltages were simulated by introducing an impedance matching technique. This work is designed to explain the modeling of piezoelectric energy harvesters. In this model, the relationship between applied mechanical force and output energy was discussed by employing experimental results and simulation.

【 授权许可】

Unknown