Low frequency power supply device for metallurgical ore-smelting furnace

The utility model relates to a low frequency power supply device for metallurgy ore heating furnaces. The utility model combines the advantages of a power frequency power supply and a direct current power supply, and the utility model has the advantages of small energy consumption, high efficiency, strong stir force and low electrode consumption. The utility model realizes low frequency electric supply by a variable frequency main circuit, seventy two pieces of controlled silicon are formed into twelve groups of full bridge silicon rectification circuits, each three groups of full bridge silicon rectification circuits input one group of three phase alternating current, and the twelve groups of full bridge silicon rectification circuits together use four groups of three phase power supplies. The utility model also adopts an in-phase antiparallel connection technique, and each two groups of full bridge silicon rectification circuits are connected into a big group according to an in-phase antiparallel connection method forming the variable frequency main circuit. The switch of frequency conversion is completed by a frequency conversion control device. The utility model has the advantages of simple structure, easy production and fabrication, the utility model can also change the existing metallurgy oreheating furnaces, and the utility model is suitable for being used for metallurgy systems.