Research On Self-Powered Synchronous Electric Charge Extraction And Voltage Inversion Circuit

With the development of computer technology and integrated circuit,wireless sensor network has been widely used.Piezoelectric Energy Harvesting(PEH),as an emerging technology in environmental energy harvesting,has many advantages such as being not affected by weather factors,simple structure,easy integration,green,and sustainability,had attracted increasing attention from researchers.Piezoelectric energy harvesting technology is used to supply energy for wireless sensor networks,which can meet the needs of wireless sensor networks in various environments.Based on the research of piezoelectric energy harvesting technology at home and abroad,this paper analyzes the working principle of some interface circuits,compares the advantages and limitations of interface circuits,and proposes a self-powered synchronous electric charge extraction and voltage inversion circuit.The main work of this paper is as follows:(1)Research on the development and basic theory of piezoelectric energy harvesting technology.This paper introduces the development of piezoelectric energy harvesting technology and the basic theory of piezoelectric energy harvesting technology,obtains the expressions of piezoelectric equations under different boundary conditions,and introduces the mechanical equivalent model and circuit equivalent model of piezoelectric elements.(2)Design and optimization of self-powered synchronous electric charge extraction and voltage inversion circuit.Compared with the common piezoelectric energy harvesting interface circuit,the topology structure of synchronous electric charge extraction and voltage inversion circuit is optimized and improved.The theory proves that the optimized interface circuit achieves the same function as the original circuit,further speeds up charge extraction and voltage inversion,and further improves the recovery power of the interface circuit.At the same time,aiming at the switching power supply problem of the interface circuit,this paper applies the electronic switch to the interface circuit,proposes a self-powered synchronous electric charge extraction and voltage inversion circuit,and omits some diodes with voltage drop loss in the electronic switch,which further reduces the energy loss of the self-powered interface circuit.A simulation test of self-powered synchronous electric charge extraction and voltage inversion circuit is carried out.(3)Experiment verification of self-powered synchronous electric charge extraction and voltage inversion circuit.The experimental platform of piezoelectric energy collection interface circuit is set up and the feasibility of the circuit is verified.The experimental platform of the piezoelectric energy harvesting interface circuit was built and tested.Through the test,the self-powered synchronous electric charge extraction and voltage inversion circuit designed in this paper can achieve a higher recovery power without additional energy from the outside world,and its recovery power in the load range of low resistance will not change with the resistance value of the load resistance.The maximum recovery power is approximately 600% higher than that of the standard energy harvesting circuit.