| |
The report examines the main problems that had to be overcome in developing the system for control of an electron beam welding machines. The electronics of the system is under potential of the accelerating voltage (60 kV), therefore it required solving the problem of power transmission and control signals. The volume of the device had to be minimized as the place to put the electronics was limited. The electronics must be resistant to high voltage breakdowns as when breakdowns there may be a voltage pulse of 60 kV with energy to 20 J in any of the cathode electrode unit. The power, necessary for the heater, can reach 250 W. To solve this task the stabilized power supply with an adustment range of 0-125 A (2.5 V) current was developed. The power needed for this power supply operating is transmitted via a special high frequency (25 kHz) transformer. The isolation voltage between the primary and secondary windings of the transformer is 100 kV. To control the current of the beam (welding current), a linear amplifier, which generates the voltage on the control grid in the range 0–4 kV, was developed. The amplifier bandwidth is 1 kHz. To control the current beam, current intensity, and to control the parameters of the gun, a specialized controller was developed. The connection of the controller with a computer is carried out with the help of optical links.
|
|