Design and Simulation of Broadband Piezoelectric Energy Harvester with Multi-Cantilever

Piezoelectric bimorph cantilever is a typical collecting structure for vibration energy, however it can not adapt to the low frequency and random of vibration excitation in natural environment. In this paper, the physical model of linear vibration system of piezoelectric bimorph cantilever is analyzed, where the piezoelectric energy harvester with multi-cantilever is designed for it's disadvantages. By increasing the cantilever beam with different natural frequencies, the energy harvester has the characteristics of broadband. By measuring the dynamic strain under sweep excitation in the simulation of Comsol, Compare the output voltage and working bandwidth between the piezoelectric bimorph cantilever and the piezoelectric energy harvester with multi-cantilever, verify the broadband characteristics of the latter. This paper also designs the rectifier circuit, to convert alternating current from the energy harvester into direct current.