Technical features:

1. IGBT is a complex of power transistor (GTR) and power effect transistor (MOSFET). It combines the advantages of GTR and SFT, so it has good characteristics.

2. The IGBT intermediate frequency power supply adopts a series connection circuit of a capacitor and an induction coil. Due to the frequency modulation power adjustment, the rectifier bridge is in an uncontrolled state, and the power factor is as high as 0.96 or more; the harmonics are small during the working process.

3. Compared with thyristor control features, IGBT transistors can not only control the conduction, but also control the turn-off arbitrarily. Unlike the passive turn-off of the thyristor, which takes time, the inverter power factor is also higher ( ≧ 97%) ), the same incoming line

voltage (380V) furnace body voltage is higher, the IGBT inverter voltage is about 2800V, the inverter voltage of the traditional thyristor is only 750 and the maximum 800v, the voltage is nearly four times higher, and the line loss is small. Energy saving 15%.

4. Constant power output. Compared with the traditional thyristor intermediate frequency power supply, it is not affected by the amount of furnace material and the thickness of the furnace

lining. It is close to the constant power output during the entire smelting process. The traditional thyristor intermediate frequency power supply is affected by the large change of the magnetic inductance during the heating process. At first, the melting power is small, which affects the melting speed. The power of the thyristor power supply changes with the melting time and the magnetic inductance . The process of slowly increasing to high-power operation reduces the capacity utilization rate of the transformer and increases the production cost. At this point, it can save about 3%-5%.