Design of Efficient Energy Harvesting Circuit Based on Piezoelectric Generator

The average output power of piezoelectric generator is small, which can not directly drive the load to work. In order to meet the energy supply demand of electromechanical system, it is necessary to design a matching energy harvesting circuit. Although the typical energy harvesting circuit is simple in structure and easy to build, the collection efficiency is low. Therefore, a new parallel synchronous switching circuit is proposed in this paper to improve the output power of piezoelectric generator. Through analyzing the circuit and optimizing the components used, a passive switching circuit is designed by using the on-effect of transistors, which overcomes the defect of external switching signal control circuit. Through experiment, the output power of the improved parallel synchronous switch circuit is 2.23 times that of the classical energy harvesting circuit.