Research On Power Generation Characteristics Of Dielectric Elastomers And Power Harvesting System

With the continuous development and utilization of new forms of renewable energy,dielectric elastomers have gradually shown great research value in the fields of generators,drives,and sensors due to their high energy density,low cost and easy processing.Among them,dielectric elastomer generators(DEGs)have been used to convert mechanical energy in nature(waves,wind energy,etc.)or human motion into electrical energy.Based on the research and analysis of the power generation mechanism of the sandwich structure dielectric elastomer,this paper conducts theoretical exploration and experimental research on the power generation test and energy harvesting storage circuit of the DEG power generation unit,so as to adapt to the development trend of wearable and miniaturized.The specific research contents are as follows:1.Based on the power generation principle of the dielectric elastic generator,the maximum conversion energy and electric energy conversion efficiency of the commonly used DEG constant charge cycle,constant electric field cycle and constant voltage cycle are deduced and summarized.The results show that constant-charge cycling can achieve maximum power conversion efficiency with minimum circuit cost.Secondly,the DEG electromechanical coupling equation is constructed in this paper,and the electromechanical parameters of DEG that affect the constant-charge power generation are studied.The results show that the elongation rate is the most important factor affecting the constant-charge power generation.A multi-layer DEG parallel theory is proposed.2.Based on the silicone rubber dielectric layer material,the composite molding and packaging process of the single-and double-layer DEG power generation unit is independently optimized and designed.According to the principle of constant charge power generation,an automatic charging and discharging experimental test platform was built.After the power generation test of the single-layer and double-layer DEG power generation unit,the experimental results show that with the continuous increase of the tensile rate and the charging voltage,the power generation of the single-layer and doublelayer DEG power generation unit continues to increase,and the multiple relationship between the two is obvious.When the charging voltage is 1000 V and the stretching ratio is 2.1,the energy generated by the single-layer DEG power generation unit is 5.170 m J and 9.112 m J respectively,which verifies the reliability of the single-layer double-layer power generation unit molding and packaging process and the correctness of the multi-layer DEG parallel theory.3.According to the characteristics of DEG output energy,a DEG thirdorder step-down storage circuit is designed.After simulation and experimental verification,the step-down storage circuit can convert the high-voltage lowcharge energy form output by DEG into a low-voltage high-charge energy form and store it in the In the fixed capacitor,the step-down storage circuit can work continuously and stably for 300 power generation cycles,and the storage efficiency of the fixed capacitor is 20.15%.This result is combined with the theoretical simulation results.The single-layer and double-layer DEG power generation unit forming and testing methods designed in this paper,as well as the step-down storage energy recovery circuit,laid the foundation for the subsequent design and performance testing of wearable and flexible multilayer dielectric elastomer power generation devices.