Simulation of a Novel Bridge MEMS-PZT Energy Harvester for Tire Pressure System

14th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Trabaldo, Edoardo^1,2 ; Köhler, Elof^2 ; Staaf, Henrik^2 ; Enoksson, Peter^2 ; Rusu, Cristina^1

Acreo Swedish ICT AB, Sensor Systems Dept., Gothenburg, Sweden^1

Chalmers University of Technology, Dept. of Microtechnology and Nanoscience, Gothenburg, Sweden^2

关键词: Autonomous sensor systems;    Comsol multiphysics;    Energy Harvester;    Innovative design;    Multiple electrodes;    Piezoelectric energy harvesters;    Pulses excitation;    Resonance frequencies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/557/1/012041/pdf
DOI  :  10.1088/1742-6596/557/1/012041

来源: IOP

【 摘 要 】

Self-powering is becoming an important issue for autonomous sensor systems. By having an on-the-go power source the life span increases in comparison to a limited battery source. In this paper, simulation of an innovative design for a piezoelectric energy harvester for Tire Pressure Measurement System (TPMS) is presented. The MEMS-based thin-film PZT harvester structure is in the form of a bridge with a big central seismic mass and multiple electrodes. This design takes the advantage of the S-profile bending and a short beam length to concentrate the piezoelectric effect in a small segment along the beam and maximize the power output for a given displacement. From simulation in Comsol Multiphysics, the 9mm × 5mm bridge, seismic mass of 8.7mg and resonance frequency of 615Hz, generates 1 μW by mechanical pulses excitation equivalent to driving at 60 km/h (roughly 180G).