Design And Fabrication Of Triboelectric-electromagnetic Hybrid Wind Energy Harvester

The power supply problem of various electronic devices has become a major problem hindering the further development of the Internet of Things system,especially in the sensor nodes,electronic devices urgently need more suitable power supply solutions.The method of obtaining environmental energy for self-powering of sensor nodes or electronic equipment provides a new idea for solving the problems caused by traditional power supply methods such as using lithium batteries or laying cables.In this paper,a kind of triboelectric-electromagnetic composite energy harvesting with flat rotating disk structure is proposed,which can realize the conversion of environmental wind energy to electric energy.A heterogeneous integration scheme of triboelectric power generation module and electromagnetic power generation module was designed to combine the two energy harvesting modes,effectively broaden the range of output voltage and shorten the time of voltage boost,improve the output energy and energy conversion efficiency of the device,and achieve the purpose of power supply for sensing nodes or electronic devices.Compared with the ordinary peak output form,the triboelectric power generation in independent layer working mode is adopted,and the interdigital electrodes arranged along the circumference are designed to produce continuous output;the magnetoelectric power generation in the rotating mode is adopted,and the multiple coils are connected in a suitable way to achieve the output the effect of electric energy superposition.This paper reveals the triboelectric effect of friction materials driven by environmental wind energy and the mechanism of magnetoelectric energy conversion.Build triboelectric power generation and magnetoelectric power generation structure models respectively,and use Comsol and Maxwell simulations to analyze the charge generation and transfer process,and guide the design of heterogeneous integration schemes.Verify and analyze the influence of friction material thickness,material type,surface microstructure manufacturing and magnet arrangement on output performance.Design an efficient power management circuit to solve the problem of the AC power output by the generator as the back-end power supply,and realize the key step of power acquisition and utilization.A corresponding test system was built to test the output results of the triboelectric-electromagnetic composite nanogenerator with a flat rotating disc structure,as well as the details of the three states of triboelectric power module(TENG),magnetoelectric power generation(EMG),and composite power generation(TEHG)Output waveform diagram,convenient to observe and analyze output results and performance parameters.In response to the requirement of self-powering sensor nodes or electronic devices,the ability to power wireless sensor nodes,LED lights,and thermometers and hygrometers is verified.The results show that at a wind speed of 9 m/s,the maximum output power of TENG and EMG are 0.33 m W and 32.87 m W,respectively,and TEHG can continuously light up 200 LEDs or supply power to the thermometer and hygrometer 2 s after starting to work;At a wind speed of 10.5 m/s,the purpose of power supply for the sensor node can be completed,the wireless transmission of sensor data can be realized,and the dynamic balance of power supply and consumption process can be achieved.