Control System Design For Electron Accelerator With Insulated Core Transformer

Electron accelerator has been widely used in industry, agriculture, health care and other fields. A rapid development of radiation processing industry is making a huge contribution to the economy. The electronic accelerator industry in our country, however, has a great development space compared with developed countries. The electron accelerator with insulated core transformer(ICT) can achieve efficiency greater than 85%, which is the highest efficiency of all high voltage e-beam manufactures. So it can save much costs in radiation processing industries. To ensure the e-beam system to work in a stable and reliable state under hash industrial production environment, an automatic control system is required. As a result, a safe and reliable control system is designed for a low energy ICT eletron accelerator.The boot process of the accelerator is simulated based on the theory of finite state machine to verify the logic functions. The power losses of the power supply and beam stop are analyzed in the article. And the cooling water parameters such as water flow and water pressure are also calculated according to the thermal and fluid mechanics theory. In order to estimate the wind flow, the heat loss of titanium foil caused by e-beam should be figured out. A specific excitation current value is studied for the electric steering magnets which scan the beam across the length and width of the window.This paper discusses the working principle of the voltage-multiplier rectifier circuit in detail, and it is compared with simulation results based on Simulink under the same conditions. Then the mathematical models of stepper motor, driver, three-phase autotransformer and power supply have been built, with which we can realize the closed loop control of high voltage DC power supply. Lag-lead correction is used to improve the dynamic and static performance of the system.Programmable Logic Controller(PLC), as the core controller, is selected to realize the control of the whole system. And the Human Machine Interface(HMI) is used for the interaction of operator and machine. The modularization programming method realized by ladder diagram programming has been carried out in each subsystem control to improve its readability. At the same time, safety interlocks operation between devices are carried out in the program.The system can collect, process, and save the data from controlled object. PLC communicates with the vacuum devices and electron gun power through the serial port. The e-beam manufacture can run automatically if it is not interrupted by operator. At present, the assembly work of accelerator has been basically completed, and the output of high voltage power supply has already reached specifications in the experiment. Now, we have extracted the output high voltage to the accelerating tube for sparking exercise. The next step is to make the accelerator work in state from no-load to rated load gradually.