Design And Simulation Of Triboelectric Nanogenerator Power Management Circuit

With the continuous development of science and technology industry,electronic devices are developing in the direction of miniaturization,low energy consumption and high functionality,especially the application of wireless sensor networks.In the face of such a huge base of electronic devices,it is difficult to use traditional power supply devices to supply power,and it is urgent to find a portable charging method to solve the problem of traditional battery mobility and sustainability of power supply.Triboelectric nanogenerators,as a new type of green energy harvesting device,can continuously convert environmental energy into electrical energy,and are easy to make,low cost,abundant material choices,and high efficiency,providing a new technological solution for collecting low quality energy.However,the energy generated is AC with high voltage and low current,and the inherent internal capacitance makes its output impedance very high.If the triboelectric nanogenerator is directly integrated with the energy storage unit,an impedance mismatch will occur during the energy transfer process,resulting in low energy harvesting efficiency,and it must pass through a power management circuit to maximize the energy utilization of the triboelectric nanogenerator.Most of the power management circuits that have been proposed require additional power to supply the circuit and the circuit system structure is complex.To address the many problems in the power management circuit,this thesis designs a self-driven power management circuit based on the output characteristics of the triboelectric nanogenerator,and the main research work is as follows:(1)The data measurement of the fabricated triboelectric nanogenerator model with vertical contact separation mode,the equivalent circuit model based on the data and the eigenequation,and the analysis of the energy storage state of the triboelectric nanogenerator without the power management circuit using simulation software.(2)In order to collect and store the energy efficiently and power the load,four self-driven energy management circuits are designed from small capacitor transition and maximized energy transfer,using discrete electronic components such as thyristor,programmable single junction transistor,MOS tube and triode to design the circuit switching topology.(3)Simulation experiments were conducted by LTspice circuit simulation software to analyze the voltage and current changes and energy transfer process during the operation of the circuit,and to compare the output of the triboelectric nanogenerator with and without the power management circuit,the simulation results show that the triboelectric nanogenerator using the power management circuit,the whole system can achieve self-power supply at the same time,its power transfer efficiency becomes higher.In particular,the synchronous charge extraction optimization circuit can achieve the maximum power transfer at 500 KΩ and the total power transfer efficiency is increased to 73.2%.