Research And Experiment Of Bidirectional Dual Storage And Low Frequency Energy Harvester

With the development and advancement of technology,residential and commercial premises are consuming more and more electricity.The open-source and saving of electricity have become the goal of researchers around the world.Research on environmentally friendly and novel energy harvesting and storage technologies are gradually replacing the traditional battery power supply methods.Among the many types of energy,human kinetic energy is a promising energy source that has received extensive attention from scholars in recent years.In this paper,we propose a for the human kinetic energy generated by the opening and closing of doors in large shopping malls and other high-traffic occasions.The energy harvester can convert clockwise or counterclockwise two rotation direction input to a single rotation direction and generate DC power.This energy harvester improves the output voltage and power and has the characteristics of high conversion efficiency,and can power the low-power electrical equipment attached to the door.Firstly,this paper analyzes the principle of the DC generator,which is the core component of the bidirectional dual-storage and low-frequency energy harvester.The structure of the DC generator is described,its electromechanical conversion principle is analyzed,and the speed,torque and DC generator model is established.The electromechanical conversion efficiency of the DC generator and the causes of its internal losses are analyzed.We completed the development of bidirectional dual-storage and low-frequency energy recovery device with the DC generator as the core component.According to the energy conversion mechanism of the energy recovery device and the technical indexes required for the design,the three-dimensional model of the two-way dual storage low-frequency energy recovery device is designed and completed.The two-way conversion unidirectional mechanism,speed-up mechanism,double energy storage mechanism,energy storage module,support structure and other modules are designed respectively.Make it meet the technical requirements such as tight assembly of energy recovery device,easy disassembly,long service life,and practical use-value.Finally,the parts are machined,and the prototype is assembled and debugged.Next,the power generation characteristics of the bidirectional dual-storage and low-frequency energy harvester in practical applications are analyzed to study the output voltage of the energy recovery device,the load power and the efficiency of the device in converting energy.The energy transfer and conversion path of human kinetic energy-mechanical energy-electric energy is analyzed,and the force analysis model of the door and the hinge in the device is established to find the input power;the two transfer paths of the energy harvester are analyzed in terms of torque and transmission angular velocity and other parameters;the influence of the up-frequency mechanism in the energy harvester on the power generation performance is analyzed;the influence of the mechanical energy storage and steady speed characteristics of the dual storage mechanism on the power generation performance is analyzed;the characteristics of each mechanism in the energy plant and its influence on the power generation performance are analyzed,and the energy conversion efficiency is studied.Finally,the test platform of the bidirectional dual-storage and low-frequency energy harvester is built and the experimental scenarios are simulated to carry out various experiments of the energy harvester.The experimental results show that the energy harvester developed in this paper can successfully recover the kinetic energy of the human body and convert it into direct current in the two rotational movements of opening and closing the door;the opening speed ratio is 492 and the closing transmission ratio is 246;the double mechanical energy storage system composed of vortex spring and flywheel can effectively reduce the input speed fluctuation and thus smooth the voltage;at an input angular speed of 45°/s（door opening and closing frequency of 0.25 Hz）,the open circuit voltage is 7.4V,the output power is 0.95 W,and its conversion efficiency is 56.79%;after cycling the door opening and closing 107 times,the13.5V,60 F supercapacitor reaches 6V,which is the voltage reached by 4 dry cells.