1. The IGBT intermediate frequency power supply adopts the load matching intermediate frequency transformer of three-phase bridge rectifier power supply, IGBT power device full bridge inverter and ultra microcrystalline alloy material , and realizes the intermediate frequency power supply with adjustable intermediate frequency output power by LC series resonance working mode. . The whole working process adopts power closed-loop control, and the working frequency automatically tracks the change of the induction inductance of the induction coil. The whole process is soft-switched and the electromagnetic interference is small. The power factor is greater than 0.92 , the power body conversion efficiency is higher than 0.96 , and it has various control signal selections. It is an ideal energy-saving power source to replace the intermediate frequency generator set and the thyristor medium frequency smelting power supply.

　　The IGBT intermediate frequency power supply series has the advantages of convenient operation, large phase-locked frequency range and strong adaptability to different induction coils. Can be widely used in vacuum or non-vacuum metal smelting, magnetic suspension smelting.

two. Performance

　　1. Adopt cabinet type integrated design or split modular design

　　2. The intermediate frequency transformer adopts ultra-microcrystalline alloy material, which has small volume, low loss and conversion efficiency higher than 0.95 .

　　3. The resonant capacitor uses a dry low loss film capacitor with a loss angle of less than two ten thousandths.

　　4. The power device adopts IGBT , which adopts LC series resonance mode, and the working frequency adapts to a large range.

　　5. Easy to operate, 100% startup success rate, output power 3% ~ 100% continuously adjustable.

　　6. With soft start, soft shutdown function.

　　7. Power closed-loop control, with current limiting, voltage limiting, power limiting and phase loss, over current, over voltage, over temperature and other protection functions.

　　8. Automatic voltage limiting function , the voltage is limited when the output voltage is ≥ 1.1 times the rated voltage.

　　9. Automatic current limiting function, when the output current is ≥ 1.1 times the rated current, the current is limited.

10. The power factor is greater than 0.92 and the conversion efficiency of the power supply is higher than 0.96 .

Third, IGBT intermediate frequency power supply schematic.