Research On Self-powered Power Management Circuit For Micro/Nano Energy Acquisition

With the emergence of various electronic products such as mobile phones,notebooks and smart bracelets,people’s life has become more and more convenient.Electronic wallet,telecommuting,health monitoring,etc.,portable and intelligent are gradually changing people’s way of life.Today,many portable electronic devices are still powered by batteries.Researchers have improved the efficiency of electronic devices by increasing the capacity of batteries and speeding up their charging.However,as a device that cannot collect energy by itself,batteries still need to be repeatedly charged or replaced.At the same time,discarded batteries also bring serious pollution to the environment.In recent years,with the emergence of a variety of new energy sources,researchers began to try to use micro-nano energy in the environment to power electronic devices to design self-powered systems.Triboelectric nanogenerators is a kind of energy acquisition device which can efficiently collect the mechanical energy in the environment and convert it into electrical energy output.However,due to the existence of its inherent small capacitance,triboelectric nanogenerators has a high internal impedance,so it needs to go through the power management circuit to supply power for electronic equipment.There are many problems in the proposed power management circuit for triboelectric nanogenerators,which limit the practicability of the circuit.In this thesis,a passive peak detection circuit is designed based on synchronous charge extraction circuit,and the self-powered power management circuit is realized.The self-powered power management circuit has the advantages of high energy conversion efficiency,strong versatility and simple structure.Combined with triboelectric nanogenerators,the real test of self-powered power management circuit is completed.The main work of this thesis includes:(1)The working principle and electrical characteristics of triboelectric nanogenerators are analyzed and summarized.The basic principle of the synchronous charge extraction circuit is introduced.Based on the V-Q curve of triboelectric nanogenerators,the synchronous charge extraction circuit for triboelectric nanogenerators is studied.(2)The design scheme of the self-drive circuit based on synchronous charge extraction circuit is analyzed,and the passive peak detection circuit is proposed to design the self-powered power management circuit.The design and optimization of the passive peak detection circuit are completed.The working principle of the self-powered power management circuit based on the passive peak detection circuit is analyzed and the corresponding simulation is carried out.(3)The actual production and performance test of the self-powered power management circuit are completed.The practical test verifies the working principle of the circuit,and proves that the self-powered power management circuit can effectively improve the charging efficiency of the triboelectric nanogenerators,and has a good versatility.(4)A triboelectric nanogenerators with contact separation was designed and manufactured,and the output performance of the triboelectric nanogenerators was tested.An application based on pedometer is designed by combining triboelectric nanogenerators and self-powered power management circuit.