The Relationship between Piezoelectric Energy Harvester's Characteristics and Their Equivalent Circuit Parameters

• Main Authors: Chun-Hua Chen, 陳俊華
• Other Authors: Shine-Tzong Ho
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/32ckt5

碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 100 === The objective of this thesis is to study is the output power of piezoelectric energy harvester system, which is consisted of the piezoelectric cantilever structure and the external load circuit. The relations between the output power and the piezoelectric energy harvester's system parameters were discussed. In the design of the piezoelectric harvester's structure with variable cross-section, maximum output power will increase as the equivalent elastic coefficient increases. Maximum output power will increase as the equivalent mass increases. On the other hand, maximum output power will decrease with the increase in the equivalent damping. Maximum output power will increase with the increase in the Electro-Mechanical Coupling N. Maximum output power will increase with the decrease of piezoelectric capacitance. The equivalent mass, equivalent damping and equivalent elasticity in structural vibration system are represented by the equivalent inductance, resistance and capacitance in the equivalent circuit. The obtained results will be helpful to the design of piezoelectric energy harvester's structure. In the experiments, the multisim simulation results were compared with the measurement. In AC load experiment, the maximum output power was 0.4mW when the optimal loading resistnace 100kΩ was used. In AC load simulation, the maximum output power was 0.386mW when the optimal loading resistnace 310kΩ was used. There are a difference of 3.1 times in the optimal resistance and a difference of 1.04 times in the maximum output power. In DC load experiment, the maximum output power was 0.38mW when the optimal loading resistnace 150kΩ was used. In DC load simulation, the maximum output power was 0.266mW when the optimal loading resistnace 485kΩ was used. There are a difference of 3.2 times in the optimal resistance and a difference of 1.43 times in the maximum output power.