Study Of A Self-triggering Energy Management Circuit Based On Triboelectric Nanogenerator

As a necessary condition for human survival,fossil energy is facing the risk of depletion,and the development of new energy has become an inevitable development path.With the rapid development of distributed sensors and portable electronic devices in the era of big data,it has become an increasingly popular method to collect energy from the surrounding environment to power electrical equipment for the limited energy storage capacity and environmental problems of chemical batteries.In energy harvesting technology,triboelectric nanogenerator(TENG)based on triboelectrification and electrostatic induction coupling can convert mechanical energy of natural environment into electrical energy,which has attracted worldwide attention.The output characteristics of triboelectric nanogenerator have the characteristics of high output voltage(from hundreds of volts to tens of thousands of volts),low current(microampere)and high output impedance(megaohm),which makes the output energy of the triboelectric nanogenerator unable to be effectively applied to load equipment.Therefore,there is an urgent need for energy management methods to maximize the use of energy and improve the output performance of TENG.Based on the output characteristics of TENG,this paper proposes a self-triggered switching power supply energy management circuit scheme based on TENG for power management of TENG.The main contents of this paper are as follows:(1)Based on Maxwell ’s equations and displacement current theory,based on the equivalent voltage source model,the output of triboelectric nanogenerator is simulated by electrical software,which lays a theoretical foundation for the simulation design of subsequent self-triggered energy management circuit.(2)Aiming at the problems of low controllability,complex mechanical design,voltage amplitude limitation,external chemical power supply and complex integrated circuit of mechanical switch in switching energy management circuit at the present stage.A selftriggered switch with TENG as the trigger source is proposed to optimize the output performance.The power management circuit stores energy through the energy unit and switches through the switching unit to improve the output performance of the triboelectric nanogenerator and reduce the complexity of energy management.And through the electrical software Multisim,the proposed circuit is simulated and designed to verify the feasibility.(3)The basic theoretical analysis,structural design simulation,circuit design and simulation of the self-triggering energy management circuit based on the triboelectric nanogenerator are carried out.The normal mode and tangential mode triboelectric nanogenerator experimental prototypes are fabricated,and the experimental test system is built.The influence of parameters such as mode selection,electrical signal adjustment,operating frequency,area selection and mode switching on the output of triboelectric nanogenerator is explored.The experimental results show that the self-triggered switch can adjust the duty cycle by using the inherent load characteristics of TENG.In addition,in the vertical contact separation mode,the coupling output of the two TENGs increases the singlecycle peak current by 137 times(from 32 μA to 4.32 m A),and increases by 5284 times(from1.3 μA to 6.87 m A)in the independent layer mode.In practical applications,it can power commercial sensors and light six 100 W lamps in parallel.The coupling output method of the switch TENG and the energy TENG provides important guidance for the development of power management and opens up a new way for practical applications.