Research And Design Of Indirectly Heated Electron Beam Melting Furnace Power Supply

Electron beam melting which is short for EBM, is a method which can dispose electron beam and transform the kinetic energy that produced by the movement of the electron beam into heat energy to smelt metal and alloy. Power system is the core component of the electron beam melting furnace. Voltage regulator power frequency boost is the method used by traditional melting furnace. In a typical power supply system of electron beam melting furnace is mainly composed of filament power, bombardment power and accelerator power.The paper introduces the history of electron beam melting furnace in detail, expounds the working principle of power system, Analyzes the problems existing in the traditional equipment, combined with the modern power electronic technology, analog electronic technology, the theory of circuit principle, a new type of high frequency power supply topology structure is put forward, the parameters are calculated; And using Matlab as a simulation software, a filament power experiment prototype based on Buck converter and an electron beam melting furnace high voltage power supply prototype based on full bridge phase shift resonant is developed.Heating is the main function of the filament power, around the filament produce electronic; this paper introduces the topology of the filament parameter calculation and device type selection, The design difficulties lies mainly in the closed loop control mode. Finally established to Buck converter output current as the sampling signal control mode; and accelerator power of main effect is to make through high voltage electron cloud formation of electron beam, finally launch to the metal surface of metallurgical melt; This paper introduces the phase-shift full bridge converter as the core circuit of high frequency switching power supply topology structure, and the design and manufacture a nanocrystals as the core of high frequency transformer, cooperate to finish the work the main loop of the high pressure.This topic select TI company TMS32F28035DSP as digital control chip, control circuit is designed. Through debugging and experiment, the filament can be stable output RMS to20A current, high voltage power supply can output the stability of the25kV high voltage; Design can meet the expected technical indicators, verify the feasibility of the design scheme of electric melting furnace.