| With the increasing attention to sustainable development and green energy,the research of new generators and their energy-harvesting systems has attracted much attention from scholars.Dielectric elastomer generator(DEG)has great potential in the field of flexible power generation because of its high energy density,large deformation,impact resistance,good flexibility,simple structure,and easy processing.In this paper,the overall energy harvesting system of the dielectric elastomer generator is studied based on its energy conversion characteristics.Firstly,the film pre-stretching device and its control system are constructed.Depending on the material properties and pre-stretching specifications of dielectric elastomer(VB4910),a multi-angle film pre-stretching device theory is proposed,and the construction of a multi-angle film pre-stretching system is completed in terms of structural design,simulation demonstration and electrical control.The experiments prove that the multi-angle film pre-stretching device shows good pre-stretching effect on flexible polymer film with thickness of 1mm.Secondly,the energy conversion platform is established.Starting from the selection of tapered stretching mode under biaxial stretching as the motion mode of energy conversion platform.Simulation analysis is carried out by finite element software to study the stress changes inside the film under tapered stretching,and the construction of the low-energy tapered stretching energy conversion platform and the setting of the stretching angle are completed according to the mechanical analysis of the material.According to the demand of power generation and the efficiency of the material,we design and improve the control unit of the reciprocating stretching structure,and further complete the construction of the thin film energy generation platform to lay the foundation for the subsequent energy collection and characterization.Thirdly,the design and experimental verification of the energy harvesting circuit.Starting from the electrical energy characteristics of DE-film energy conversion output,the energy harvesting interface circuit was comparatively analyzed and a weak energy harvesting interface circuit was established to convert the current from the output of the flexible dielectric generator into a stable current.Using the oscilloscope,digital bridge,and other equipment to characterize the performance of the thin film generator,it is found that the capacitance value of VHB4910 film increases with the increase of stretching distance,and the leakage rate is 30%when the stretching distance is 40mm.In the process of energy conversion and collection,the bias voltage can be extended appropriately to improve the power generation capacity of the film,as well as to increase the deformation size and stretching speed in the stretching deformation range can increase the converted electrical energy.Meanwhile,this experiment uses light-emitting diodes to visualize the electrical energy converted by the system,and it is found that the power generation system can effectively turn on 50 diodes and effectively cycle more than 5 times.Finally,the storage system is studied,using lithium batteries as storage circuit elements,and the effectiveness of the storage circuit is verified so that the power generation system can perform the task of charging the lithium batteries.In this paper,starting from the thin film pre-stretching system,we study the factors affecting the power generation rate of the complete system by building an integrated energy conversion-collection-storage dielectric elastomer generator platform.And provide theoretical support for the preparation and application of the new flexible dielectric elastomer generator. |
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