Research On The Micro Vibration Energy Harvesting System Based On Triboelectrification And Piezoelectric Effect

With the increasing popularity of green energy,environmental energy harvesting technology has provided new power supply solutions for various fields,especially on information technology such as the Internet of Things and wireless sensing technologies.So power supply solutions based on environmental energy harvesting technology are increasingly drawing attention from researchers.It has obvious academic and application significance.This paper focuses on vibration energy in the environment,conductes research on vibration energy harvesting systems based on triboelectrification and piezoelectric effect,which has significant academic and practical significance.Firstly,the necessity of the research of the micro-energy harvesting system is analyzed in this paper.The feasibility and practicality of the energy harvesting technologies are discussed.Compare different types of vibration energy harvesters with each other and analyze the advantages and disadvantages.Research status and technology development trend of the micro-energy harvesting system are summarized in detail.Secondly,this paper focuses on the vibration energy harvester.The basic work principle of the triboelectric nanogenerator and piezoelectric vibration energy harvester are discussed.The structure and working process of different types of energy harvesters are described,their electrical models are constructed,and the electrical model is experimentally verified in this paper.The material selection of the hybrid vibration energy harvester is determined and a hybrid vibration energy harvester structure is designed.Thirdly,this paper pays attention to the power management circuit,the basic principles of impedance matching is expounded.Two key issues of the triboelectric nanogenerator management circuit are proposed.The capacitor charging process and the impedance matching circuit are theoretically analyzed,and an impedance matching circuit using coupling inductances is designed.The experiment result shows this circuit can achieve a stable output voltage of 5.5V at 3.6s.For the piezoelectric energy harvester,a management circuit was designed using the LTC3588.The electrical parameters of the input capacitors and output capacitors are determined.The experimental results show that the circuit can output 3.6V voltage stably.Finally,a complete micro-energy harvesting system is designed including the system hardware architecture and software process.For the hardware architecture design,the relationships among various modules are described,the sensor and control chip are determined.For the software process design,IIC driver program for the sensors are programmed.And a variety of wireless transmission protocols are compared and analyzed.Wi-Fi protocol is selected as the wireless energy transmission protocol of the micro energy harvesting system.The software platform configuration of ESP32 is completed,wireless transmission code is written using the development platform Arduino IDE,and communication with the server is realized.The experimental results of micro-energy harvesting system show that the vibration energy harvester based on triboelectrification and piezoelectric effect can efficiently achieve vibration energy harvesting.After the output voltage which is optimized through the management circuit successfully enable the sensors and control chip,and the server can successfully obtain environmental information.The system can realize self-powered,which has important academic and practical significance.In this paper,the design of micro-energy harvesting system has universal applicability,it has significant guiding significance for the promotion of micro-energy systems.The theoretical design involved in this paper has important academic and practical significance.