Modeling And Simulation Of Piezoelectric Energy Harvester

With using MEMS, micro-electronics and other low power electronic products more convenience, the need for portable, mobile power is more strongly. Many drawbacks of the traditional chemical battery which can not be ignored, such as big size, large quality, limited lifespan, periodic replacement. People begin to study the method that can harvest energy from environment and convert to electricity. The energy harvester based on piezoelectric has many advantages, such as big energy density, simple structure, low energy consumption, easy miniaturization, so it is very broad application prospects. Previous research on piezoelectric energy harvester, either focus on the piezoelectric structure optimization, or focus on energy storage circuit, they are ignored the coupling of the piezoelectric structure and storage circuit. There are two main forms of piezoelectric structures: cantilever and disc pattern, in this article two kinds of energy harvester will be studied, the coupling of the piezoelectric structure and storage circuit will be considered. Their mathematical model and simulation for power generation performance will be studied.In this paper, cantilever energy harvester is firstly studied. Using theory of elasticity and piezoelectric established piezoelectric structure and energy storage circuit coupled mathematical model of power generation performance, and based on the model analyze the impact of main structural parameters, piezoelectric material parameters and load on energy harvester's output performance, for the cantilever piezoelectric energy harvester structure design and optimization provide a theoretical study.Based on theoretical analysis, the electro-mechanical coupling finite element simulation model of cantilever piezoelectric energy harvester is established. Use the model analyze the impact of main structural parameters of the energy harvester, piezoelectric material parameters and load on energy harvester's output performance, Verify the correctness of theoretical model.Finally, disc piezoelectric energy harvester with a central-attached mass is studied, Using theory of elasticity and piezoelectric established the coupled mathematical model of power generation performance, Use the model analyze the impact of frequency and load on energy harvester's output performance in both series connection and parallel connection, at the same time, the electro-mechanical coupling finite element simulation model of disc piezoelectric energy harvester is established, simulation verify the correctness of theoretical model.