Research On Impact Energy Harvesting Circuit Based On Contact Electrification Principle

With the rapid development of the world economy,the demand for fossil energy is increasing.A series of economic and living problems such as environmental pollution and social unrest caused by the energy gap are seriously threatening the survival of human.For portable devices,batteries are commonly used for energy storage and supply,but they have disadvantages such as limited service life,easy pollution after being abandoned,and frequent replacement of batteries also limits the use environment of portable devices.Therefore,seeking and developing a kind of renewable clean energy becomes a feasible method to solve the above problems.Triboelectric nanogenerator(TENG)has attracted extensive attention because its simple structure,easy to manufacture and deploy in batches,and can effectively collect mechanical energy in nature.Based on the introduction of the basic theory and working mode of triboelectric nanogenerator,aiming at the characteristics of AC signal output by triboelectric nano generator and unstable output signal.This paper designs a triboelectric nanogenerator for collecting impact energy,develops and designs the corresponding power management circuit,converts its original output signal into DC signal,and realizes the stable output of low ripple voltage.The specific work is divided into the following three points:(1)According to the relevant principles of triboelectric nanogenerator,based on Maxwell’s equations and the principle of charge transfer,a triboelectric nanogenerator collecting impact energy is designed,and the electrostatic field simulation is to explained the law of charge movement process.It provides theoretical support for the subsequent design of power management circuit.(2)Aiming at the problem of using active devices and having many types of components in the current power management circuit,a power management circuit based on passive devices is designed,which reduces the types of components and the loss and complexity of the circuit.The simulation of power management circuit is also carried out.(3)Based on the basic theoretical analysis,structural design,circuit design and simulation results of the triboelectric nanogenerator for impact energy collection,made to collect the impact energy of triboelectric nanogenerator prototype.Build corresponding experimental platform,and systematic test and application.Taking the output voltage value,the time required to achieve stable voltage,and the ripple value after voltage stabilization as research objectives,based on Lab VIEW software debugging of upper computer.Build output characteristic experimental system for the related theory and experimental test,analysis of circuit elements such as resistor,capacitor,Zener diode parameters effect on the output voltage.The experimental results are in good agreement with the expectation.And the number of power generation units can be judged by the output voltage value.This paper shows the prospect of stabilizing TENG output voltage under random excitation and monitoring energy flow during impulse energy acquisition.