Study On High-voltage And High-power DC Power Supply Of Inslated Core Transformer

Electron irradiation accelerators are one of the key equipment of irradiation processingindustry, which are widely used to process industrial cable, heat shrinkable tube,engineering plastics, semiconductor device surface coating, rubber vulcanization,polymer foam, food antisepsis, medical and health products disinfection, water treatment,industrial waste treatment, dust treatment etc., These products are almost used in allfields of human life. Beside the industrial uses, Electron irradiation accelerators are alsoapplied to the low energy nuclear physics research, nuclear analysis, biological medicineand other fields.The most important component of Electron irradiation accelerator system is the highpower high voltage DC power supply, which provides energy to the electron beam. Sothe performance of the power supply affects the quality of the final output beam directly.Insulation core transformer (ICT) power supplies with high efficiency and high powerbecome the most ideal type for the low-energy electron irradiation accelerator.Therefore the development of high-performance, high quality ICT type high power highvoltage DC power supply for the irradiation industry is significative.In this paper, detailed analysis of the ICT high voltage DC power supply is carried out.Through the optimization calculation, high voltage DC power supply used for electronirradiation accelerator has been completed.According to the ideal magnetic circuit model of the ICT, the function of the loss to thecore size and magnetic flux density has been obtained, and the working magnetic fluxdensity of cores has been determined by the loss curve. A leakage magnetic circuit modelof the ICT has been put forward. Druing the design of ICT, leakage magnetic circuitmodel can be used to calculate excitation inductance and design the turns of original andvice side accurately. In this paper, key components optimization and design of the power supply have beencompleted. Analysis and calculation of the electric field distribution in the key positionof the power supply has been done. And optimization design of the key components’sizeparameters has been done combined with engineering practice. The original coil eddycurrent loss has been analyzed thoroughly, and a practical and feasible design scheme hasbeen put forward combined with the actual engineering practice. The engineering designof the secondary core has been finished, and the processing of the core is also discussed;the advantages and disadvantages of each scheme are analyzed.Thermal analysis of the High voltage power supply thermal has been done by the mothedof FEM, and a rough design of water heat exchanger has been finished. This paper alsogives a brief introduction of the control system, protection system and other auxiliarysystems for the power supply, and then describes the working principle of these systems.