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SCR Medium Frequency Induction Heating Equipment
The thyristor intermediate frequency power supply is a static frequency conversion device that converts the power frequency 50Hz (or 60Hz) three-phase AC electrical energy into a single-phase intermediate frequency AC electrical energy.
The thyristor intermediate frequency power supply is actually an AC-DC-AC converter, and its basic principle is shown in Figure 1.
Figure 1 Block diagram of AC-DC-AC converter
The three-phase power frequency current becomes a pulsating direct current after rectification, and becomes a smoother direct current after filtering, and then is converted into an intermediate frequency current of a certain frequency range by an inverter to supply the load (induction coil) to heat the metal workpiece.
The main purpose:
·On-line annealing and on-line quenching and tempering of steel pipe welds.
·Metal smelting, heat preservation, welding, metal diathermy, tempering and other heat treatment.
·Induction heating occasions where the workpiece is indirectly heated by graphite crucible, metal crucible, metal pipe, etc.