Key Technology And Experimental Research Of High Efficiency Electromagnetic And Friction Composite Energy Acquisition

With the rapid development of power Internet of things technology and sensor technology,using self-powered technology,the development of vibration energy harvester converts to convert vibration energy form the natural environment into electrical energy,and design a power management circuit to transform and store the converted electrical energy,and finally realizes power supply for wireless network sensor nodes has become a research hotspot.There are various forms of vibration energy harvesting,including self-powered technology using single vibration-electromagnetic energy harvesting principle,and self-powered technology using vibration-electromagnetic-friction composite energy harvesting to further improve the collection of vibration energy.At present,the research of composite vibration energy harvesting mainly focuses on horizontal vibration energy harvesting,which is simple and easy to realize.However,the actual industrial production,human motion and so on are often the vibration energy generated in the vertical direction,and the existing self-powered technology combined with the vertical motion form of the energy harvester is relatively few;in addition,the power management circuit matching the vibration energy harvesting often uses a simple bridge rectifier circuit,and the power acquisition and conversion efficiency is efficiency not high.Therefore,the existing problems limit the application scenarios and scope of composite vibration energy harvesting.In view of the existing problems,this paper carried out the key technology and experimental research on the efficient acquisition of electromagnetic-friction composite energy,and clarified the mechanism of vibration energy harvesting in the vertical direction and multiple inclination angles,and proposed the design of vibration electromagnetic friction composite energy acquisition.Considering the influence of different materials and structural parameters on the energy acquisition effect,a power management circuit matching with it was designed.the specific research contents are as follows:Firstly,the motion form of the permanent magnet in the energy harvesting device is analyzed and studied,and the vibration-electromagnetic energy harvesting simulation model is built.The damping effect of the permanent magnet and the Column barrel,the winding position of the coil,the number of turns of the coil and other variables on the energy harvesting are studied,and the verification test is carried out.Secondly,the friction effect between the magnet and the cylinder wall when the magnet moves vertically is studied.The vibration-electromagnetic-friction composite energy harvester is designed with friction damping as the coupling physical quantity,which maximizes the collection of electricity generated by friction without affecting the vibration-electromagnetic energy collection.Finally,a power management circuit matching the composite energy harvesting is designed,and a variable frequency impedance matching power management circuit structure is proposed.The full hardware design is used to minimize the loss of electric energy in the power management circuit.Through the impedance matching power management circuit,the electromagnetic-friction composite high-efficiency energy harvester can collect 100 m W energy with a load impedance of 100Ω,and the wireless data transmission capacity is verified by experiments.