Design And Implementation Of Dual-mode Controlled 50kV High Voltage Power Supply

In recent years,high voltage power supply has played an important role in the application fields of high-voltage ion engine,electro-aerodynamic propulsion system,high-voltage electrostatic spinning nanofibers,scientific experiments and even modern daily life.However,the existing high voltage electrostatic spinning power supply has the disadvantages of low efficiency,poor stability,large output ripple,large volume,single control mode and complicated operation.To this end,it is of practical engineering value and significance to explore and develop a high voltage power supply that has the advantages of stable and efficient,simple operation,small size and so on,and is applied to the field of electrospinning technology.According to the high voltage output of the electrospinning equipment and the need for flexible control,this dissertation designs a dual-mode controlled high voltage power supply with a maximum output of 50 k V,completes the circuit design of the high voltage power supply hardware and software system,and builds a simulation model to verify the preliminary effect,makes a prototype of the high voltage power supply,and makes insulation potting process measures,and connects high voltage electrostatic spinning equipment can work safely and stably.The main work of this dissertation is as follows:Firstly,the research background and significance of high voltage power supply are described.The research status and development trends at home and abroad in terms of research fields,topological structure and step-up strategy are analyzed,and the key issues of high voltage power supply technology are summarized.Secondly,the basic composition,working principle and topological structure combination of the high voltage power supply are analyzed.The analytical expression of the transfer function from the low-voltage side to the high voltage side of the step-up topology is derived,and the influence of the step-up topology on the transfer characteristics is analyzed.Then it compares different voltage-multiplying topologies and main power topologies,combines with the working principle of topology,and then optimizes the main circuit topology architecture of the high voltage power supply by considering its advantages and disadvantages and suitable topological com binations.Next,the modularized overall architecture design of the high voltage power supply was performed using switching power supply technology.A high voltage power supply composed of four modules and completing the functions of each stage was designe d.The four main modules include power supply modules,drive and inverter modules,and isolated step-up module,and control module,which realized the function of AC-DC rectificate,DC-AC invert,analog / digital alternative control,isolate / convert and AC-DC voltage-multiplying rectificate.The design idea and design process of each part of the dual-mode controlled high voltage power supply hardware system are described in detail.There are also detailed designs for key circuits and key components such as type selection design of step-up transformer,insulating high voltage capacitors and high voltage diodes with high withstand voltage characteristics,the parameters of important components are decided,and the software part is designed and verified.Finally,the designed component parameters are used for software simulation and verification,and a 50 k V dual-mode controlled high voltage power supply experimental prototype is built for testing to verify the correctness,effectiveness and rationality of the design.