Design And Optimization Of Output Interface Circuit For Triboelectric Nanogenerators

The great popularity of 5G mobile network technology has accelerated the arrival of our modern intelligent society,where billions of distributed sensors are needed as sensor officials for information collection,which poses a huge challenge for high-precision sensors and distributed power generation.As an emerging technology,triboelectric nanogenerator（TENG）can effectively acquire low-frequency mechanical energy in various environments and convert it into electrical energy,which has the advantages of low cost,environmental friendliness and strong adaptability,showing great potential as a distributed power generation.However,due to the large output impedance of TENG,the impedance matching problem needs to be considered when the converted power is output to the external circuit,which greatly limits the practical application of TENG.Based on the basic characteristics and output electrical properties of rotating triboelectric nanogenerator,this thesis mainly designs the energy management circuit of rotating triboelectric nanogenerator for processing power output and storage,and realizes the design and optimization of the output interface circuits of rotating triboelectric nanogenerator.The main work of this thesis is as follows:（1）First of all,the characteristics of structure and output of the rotating triboelectric nanogenerator are analyzed,and the equivalent circuit model of TENG is derived then.Next the model of variable capacitors is constructed in SPICE software by using the method of syntax control variable,and the TENG equivalent circuit model is integrated into the simulation software,in which the open-circuit voltage V_OC and the short-circuit current I_SC are measured.Finally,the relevant data are obtained in the experiment,and the experimental data is compared with the simulation results to verify the correctness of the established TENG model.（2）Three different rectifier circuits are analyzed:half-wave bridge,full-wave bridge and Bennet’s voltage doubling circuit.The rectifier circuit simulation of TENG is carried out in SPICE simulation software,and the output results of rotating TENG under different rectifier circuits are investigated experimentally.The influence of different memory capacitors in Bennet’s voltage doubling circuit on the rectifier output results is also explored.It turns out that full-wave bridge rectifier is currently the best rectifier scheme for rotating triboelectric nanogenerator.（3）Based on the full-wave bridge rectifier circuit,this thesis explores the influence of different filter loops（RC filter loop and LC filter loop）on the output port of rotating triboelectric nanogenerator.The simulation results show that the LC filter loop applied to TENG can not only achieve the same voltage regulation effect as RC filter loop,but also resonate with the output frequency of TENG to further optimize the design of the interface circuit.In the experimental part,firstly the Altium Designer software is used to draw a PCB for the interface circuit,and then the circuit board is proofed,the components are soldered,and the circuit is integrated on the board.The experimental results have a stable and step-up effect consistent with the simulation results.The next step is to design the conditioning circuitry.Firstly,the LTC3330 energy harvesting chip is driven with the rectified filter voltage in the simulation software,and different DC outputs are achieved by adjusting different output voltage configurations.In the experiment,the rotating TENG is connected to the circuit board and the power of the storage capacitor is used to successfully drive the LTC3330 to work.The experimental results are basically consistent with the simulation results,and the design of the rotating triboelectric nanogenerator interface circuit is completed.（4）Based on the interface circuit designed in this thesis,a rotating triboelectric nanogenerator with 8 pairs of sectors and an outer diameter of 75 mm is selected as the output of AC power supply to explore its application capability.The power stored by the capacitor can realize the following functions without any external power supply:lighting the LCD,powering the mobile phone,driving the wireless Bluetooth devices such as temperature and humidity sensors,light sensors,human body sensors to work normally.