SCR I.F. power used for induction heating is a 3-phase bridge mode rectifying circuit, which rectify the 50Hz AC to DC, then invert to single phase I.F. load through filter and inverter, SCR I.F. power actually is a power transformer of AC-DC-AC. This device adopts 89C51 single chip as control core, equipping large scale integrated circuit, it regulated current and inversion greatly on the base of realizing software and hardware functions. So SCR I.F. power be used widely in the lines of smelting, I.F welder quenching, hot charging, annealing, braze welding, elbow, sintering etc.