Design of cantilever type piezoelectric energy harvester with wideband frequency operation for wireless sensor network

摘要

The piezoelectric energy harvesters for energy supplier have attracted attention due to its high energy density. These types of devices have features that they are resonated at specific frequency from external vibration and this frequency significantly impacts on the amount of harvested energy. However, most excitations in operating environment have broadband characteristics rather than one peak at certain frequency. Hence, the optimization of these properties is critical to maximize the generated power in the device. The focus of this study is to discuss the design and optimization of a piezoelectric device used to supply power to wireless temperature sensor network under wideband frequency operation. The performance of piezoelectric energy harvester was investigated based on the results of numerical calculation and harvesters were optimized to be operated under wideband frequency operation.