POWER CONTROL OF ARC-TYPE STEEL-MAKING FURNACE Russian patent published in 2012 - IPC C21C5/52 H05B7/148 

FIELD: metallurgy.

SUBSTANCE: control includes power setting device for each phase of furnace, the first controlled key with two control inputs, dead zone unit, the second and the third controlled keys, the second time register, two constant voltage sources and adder. Adder output is connected to input of the first controlled key and to its first control input. Output of the first controlled key is connected to input of controlled reversible converter to the output of which there connected is electrode movement motor. Output of the first time register is connected to the second control input of the first controlled key, the first input of which is connected to output of power setting mechanism, and the second one is connected to output of the second controlled key, the input of which is connected to output of the first constant voltage source, and the first control input is connected to the second control input of the first controlled key, to the first control input of the third controlled key, to output of the first time register and to input of the second time register the output of which is connected to the first control input of the second controlled key the second input of which is connected to output of the second constant offset voltage source, and output is connected to the third adder input.

EFFECT: higher accuracy of maintaining the specified electric mode.

1 tbl, 3 dwg