Design And Experimental Study On Interface Circuit Of Piezoelectric Vibration Generator

The airflow induced vibration piezoelectric generator can be defined as a piezoelectric generator that uses the air-exciting vibration caused by the pallets during their flying in trajectory, which is featured as simple construction, small volume, high energy conversion efficiency, etc. This thesis takes airflow induced vibration piezoelectric generator as research object. It focuses on the current issues of energy-harvesting and power controlling of airflow induced vibration piezoelectric generator, and mainly discusses the interface circuit of power controlling. Meanwhile, the improved passive synchronous charge acquisition circuit was designed with the characteristics of high output power, low-power consumption, self-powered and strong workload-adaptability.This thesis puts forward the issues of energy-harvesting and power controlling of airflow induced vibration piezoelectric generator combined with the subject research background. An output power theory model of airflow induced vibration piezoelectric generator has been proposed in this thesis, binding with piezoelectric equation and the characteristics of sound source motivation based on the working principle of piezoelectric generator. Therefore, equivalent model of compulsory vibration piezoelectric generator has been set up, kinetic equation of piezoelectric energy harvesting system in dynamic balance condition, providing theoretical basis for the design of power conditioning interface circuit.Theoretical analysis on the interface circuits with different topological structures has been made, and the passive synchronous charge acquisition circuit which features low-power consumption and self-powered has been optimized. In addition, equivalent circuit stimulation model of the piezoelectric vibrator has been set up in this thesis and it simulates and analyzes the output characteristics of interface circuits with different topological structures.Based on the Multisim circuit simulation, we did actual blowing experiments on interface circuits with different topological structures and analyzed the electric output characteristics of the whole piezoelectric generator system at different flow velocity of circuits with various structures. The experiment data suggests that the passive synchronization circuits have strong output power and good load matching.