Compared with thyristor medium frequency induction heating power supply, IGBT super audio frequency induction heating power supply has the following characteristics:
(1) The electrical efficiency of the power supply is high. The inverter output voltage of IGBT super audio power supply is high, the current is small, and the line loss is small. It is an energy-saving power supply. The power factor is about 10% higher than that of thyristor intermediate frequency power supply, and the smoothness can reach more than 90%.
(2) The output power is stable. The IGBT inverter frequency tracks load changes. As the temperature of the heated metal increases, when the resistivity and magnetic permeability change, the power supply operating frequency also changes randomly. It reaches the full resonant frequency and automatically tracks the power supply output power through the node power frequency. , that is, frequency conversion power adjustment. This achieves stable output power and significantly improves heating efficiency.
(3) Little interference to the power grid. The high harmonics generated by the IGBT super audio inverter power supply are small and the harmonic interference to the power grid is weak.
IGBT super audio power supply also has problems that need to be improved, such as insufficient stability and high price.
IGBT super audio power supply and thyristor intermediate frequency power supply have become the main power supply for induction heating. Among the IGBT super audio power supplies, the parallel inverter power supply that is suitable for induction instant heat and rapid heat treatment is mainly used for induction heating heat treatment of small-scale rods, wires and wires. Series inverter power supplies are rarely used.
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GS-ZP-1200
