Principle Analysis of High Frequency Power Supply Control in IGBT

Part of the principle and advantages of igbt melting furnace power control
Principle Analysis of High Frequency Power Supply Control in IGBT
(1) IGBT intermediate frequency power supply is a kind of constant power output power supply. With a certain amount of material, full power output can be achieved, and it will never change, so the melting speed is very fast; because part of the inverter power supply uses series resonance, and The variable power supply voltage is high, so the IGBT intermediate frequency is more environmentally friendly and energy-saving than the ordinary thyristor medium frequency; the IGBT intermediate frequency adopts frequency modulation and power adjustment, and the rectification part adopts full bridge rectification, inductance and capacitance filtering, and always operates at 500V, so the IGBT intermediate frequency causes high harmonics. Small, causing low pollution to the power grid.

(2) Energy-saving IGBT transistor IF power supply can be environmentally friendly and energy-saving 15%-25% than traditional thyristor IF power supply. The main reasons for environmental protection and energy conservation are as follows:

A, the inverter power supply voltage is high, the current is small, the line loss is small, this part can be environmentally friendly and energy saving about 15%, the energy-saving IGBT transistor IF power supply inverter power supply voltage is 2800V, and the traditional thyristor intermediate frequency power supply inverter power supply voltage is only 750V, the current is nearly 4 times smaller, and the line loss is greatly reduced.
B. The power factor compensation is high, the power factor compensation is always greater than 0.98, and the reactive power loss is small. This part is 3%-5% more environmentally friendly than the thyristor medium frequency power supply. Since the energy-saving IGBT transistor IF power supply adopts the semi-controllable rectification mode, the rectification part does not adjust the thyristor conduction angle, so the power factor compensation of the whole operation process is always greater than 0.98, and the power loss is small.
B. The heat loss of the furnace is small. Because the energy-saving IGBT transistor medium frequency power supply can be about 15 minutes faster than the same power thyristor medium frequency power supply, the heat loss from the furnace mouth can account for 3% of the whole process in 15 minutes. This part is about 3% more energy-efficient than the thyristor IF.

(3) High-order harmonic electromagnetic interference: The higher harmonics mainly come from the spur voltage caused by the thyristor when rectifying a part of the voltage regulation, which will seriously pollute the power grid, causing other equipments to fail to operate normally, and the energy-saving IGBT transistor medium frequency power supply Part of the rectification adopts semi-controlled rectification mode. The DC voltage always runs at the highest level and does not adjust the conduction angle. Therefore, it will not cause high harmonics, will not pollute the power grid and transformer, and the switch will not generate heat. The operation of electronic products.

(4) Constant power output: The thyristor intermediate frequency power supply adopts voltage regulation and power adjustment, while the energy-saving IGBT transistor intermediate frequency power supply adopts frequency modulation and power adjustment, which is not affected by the amount of furnace material and the thickness of the furnace lining, and maintains constant power output throughout the melting process. Especially when producing non-magnetic materials such as stainless steel, copper, aluminum, etc., it shows its superiority, the melting rate is very fast, the burning of the burning elements is less, and the casting cost is reduced.