Research On Power Management Circuit Base On Low-Frequency Micro-Nano Energy Harvesting

As an important part of new infrastructure construction in digital transformation,Internet of Things(Io T)provides fundamental support for ubiquitous connectivity among people,machines and things by building a mapping of the physical world to the digital world.As the deployment of Io T advances,the increasing number of Io T nodes poses a challenge to the way Io T devices are powered.Micro-nano energy harvesting devices have excellent environmental energy harvesting and conversion capabilities,and have great potential to provide power supplements for wireless Io T nodes.The existence of a large amount of mechanical energy in nature provides a rich application scenario for lowfrequency micro-nano energy harvesters for mechanical energy harvesting.Due to the high output impedance of the low-frequency micro-nano energy harvester for mechanical energy harvesting,it is difficult to directly supply energy to the load,and it needs a power management circuit to drive the load effectively.Among them,the design of discrete and integrated power management circuits of Triboelectric Nanogenerator(TENG)is still in the research stage.Based on the low-frequency micro-nano energy harvester for mechanical energy harvesting,this thesis focuses on the design of the power management circuit of the TENG.Based on the theory of Cycles for Maximized Energy Output and the principle of Synchronous Electric Charge Extraction,starting from the research and design of discrete power management circuits,it progresses to the research and design of integrated power management circuits step by step.The main research content of this thesis is as follows:Starting from the discrete design,a power management circuit based on differential peak detection is designed to research and improve the influence of external interferences on the working state of differential power management circuits in low-power application scenarios.In order to further integrate,based on TENG’s first-order Lumped Parameter model and Definite Solution Problem model,the simulation platform of TENG is researched and realized.Based on the research of discrete circuits,an integrated differential power management circuit is researched and designed.In order to further improve the integration of power management circuits,an integrated power management circuit is researched and designed.This circuit uses switched capacitors and dynamic comparator to achieve peak detection,and uses level shifters and HVPMOS to control the transfer of power from TENG to load.The integrated power management circuit designed mainly includes a level shifter,a bandgap reference,a dynamic comparator,an oscillator,a sample-and-hold circuit,and a switch MOSFET.Finally,0.18 μm 1P3 M BCD process is used to realize the design of integrated power management circuit,and careful simulation design and analysis are carried out under the combination of Process,Voltage,and Temperature(PVT).With external 3.3 V auxiliary power supply,TT process,and1.915 k Hz clock frequency,the power consumption of the designed integrated power management circuit is 1.574 μW.