Research On High Voltage Power Supply System Of Insulated Core Transformer

At present,the irradiation industry is developing rapidly,bringing good economic and social benefits.The electron accelerator is the core equipment of the irradiation industry,and the demand of electron accelerators is also increasing.As a common type of high voltage electron accelerator,insulated core transformer(ICT)electron accelerators have the advantages of high efficiency,stability and reliability,and are very suitable for radiation applications of0.3-1Me V.The research on a 500 k V/100 m A ICT high voltage power supply system for the electron accelerator is carried out in this paper.It is aiming to further optimize the design of high voltage power supply system and promote its industrialization.The ICT high voltage power supply system mainly has two parts: the high voltage power supply and the filament power supply,and the design of both parts are carried out.The high voltage power supply is the main part.Firstly,the structure and materials of the key components for the high voltage power supply are selected,and the reasonable value of the single-layer voltage is designed to determine the basic design parameters.Secondly,the magnetic circuit model is established to obtain the funtional relation between the coil turns,the current of the coils,the radius of the magnetic core and the magnetic flux density,etc.The loss of the ICT high voltage power supply can also be calculated based on the functional relation.The operating point is determined according to the loss curve,and the preliminary design parameters of the ICT high voltage power supply are obtained.Thirdly,finite element simulation software is used to establish the model of the high voltage power supply.The thickness of the insulation layer,the structure size of the ICT and other parameters are analysed.The magnetic field and the output voltage are used to evaluate the optimization of the structure size.The layout of the rectifier disk is also designed to further reduce the whole volume of the high voltage power supply.Fourthly,the hybrid compensation method of dummy primary coil and increasing turns of the secondary coils is adopted to reduce the unevenness of the output voltage.Finally,all of design parameters are determined.The filament power supply is installed on the top of the high voltage power supply.The output voltage of the secondary coils,which are at the top the high voltage power supply,is used as the input voltage for the filament power supply.Firstly,the demand analysis is carried out,and the LLC scheme is selected after comparing various options.Secondly,the working principle of the power supply is analysed,the resonance parameters are determined,the highfrequency transformer is designed,and the main circuit design is completed.Thirdly,auxiliary circuits such as driver,measurement,communication and auxiliary power supply are designed.Finally,the prototype of filament power supply is completed.The design of the 500 k V/100 m A ICT high voltage power supply system for the electron accelerator is completed in this paper.The performance parameters,volume and weight of the high voltage power supply have reached the international level of similar equipment.At the same time,the design and research of the filament power supply are carried out,and the development of the preliminary prototype is completed,which has a certain significance for improving the beam control accuracy and response speed.