Design and implementation of power supply for DC fused quartz furnace

Abstract

Taking 30V/2000A DC fused quartz furnace for object to design a new kind of low-voltage high-current controllable rectifier power supply. The power supply takes the method of putting AC voltage regulator on the transformer primary side and rectifier circuit of double star in reverse on the secondary side and the size of the output current is controlled by changing the conduction angle of controllable devices. It uses thyristor on the transformer primary side, and then the secondary side can use cheap diode. It is not only easy to control and operate but also to design the trigger circuit. It can greatly improve the size of the output current because the diode capacity is larger than others. The simulation model is obtained by using the Matlab/Simulink software. The results of simulation prove that the power supply has strong adaptation and good dynamic performance. The power supply has been used in an actual production and it works efficiently and reliably.