Main circuit structure and working principle of induction heating power supply
Induction heating power supply has been widely used in metal smelting, welding, bending, surface hardening and other hot processing and heat treatment industries. For different workpieces and different processes, it requires different power supply working frequency and output power, today we introduce the induction heating power supply main circuit and its original working principle as shown in Figure 1, it is composed of rectifier, filter and inverter.
The rectifier adopts uncontrollable three-phase full-bridge rectifier circuit, and the filter adopts two electrolytic capacitors C1 and C2 in series to reduce the voltage borne by a single capacitor, and R2 and R3 play a role in voltage balancing. R1 is the current limiting resistance. When the system is powered on, the voltage at both ends of the capacitor is zero, so the current will be large when the capacitor is charged at the beginning. When the current limiting resistance RI is added, the current will not be large as shown in Fig.1. When the voltage at both ends of the capacitor reaches a certain value, the AC contactor KI is closed and the current limiting resistance is shorted. The system can work normally.
The inverter adopts a single phase variable inverter bridge connected by a transformer and a series resonant circuit. Two groups of IGBTs that drive single-phase diagonal in turn are used to convert the constant DC voltage into 10H:-10kHz square wave voltage and output it to the load. The working waveform is shown in Figure 2. C3 and C4 are non-inductive absorbing capacitors, which are used to suppress the surge voltage of IGBT.
The existing product range of WTR includes power frequency electromagnetic inductionheaters, medium and high frequency electromagnetic induction heating equipment, andprofessional and complete heating schemes are formulated according to customer heatingneeds. They are widely used in industries such as new energy, wind power, cement, mining.papermaking, metallurgy, transportation, etc., perfectly achieving process requirements suchas hot sleeve disassembly, local heating of special-shaped workpieces, pre welding preheat.ing. post welding hydrogen elimination, and rapid assembly of automated assembly lines.Since its establishment, WTR has established and improved a scientific and standardized management system, ensuring that the quality management system is in line with interna-tional standards We have passed 1S09001 quality management system certification, international CE certification, and energy-saving and environmental protection system certificationOur electromagnetic induction heating products have all passed national demagnetizationtesting certification and temperature accuracy testing certification. Shandong Weiterui industrial Technology Co., Ltd. has been rated as an AAA level demonstration unit for honest op-eration and has obtained a credit rating certificate for bidding enterprises.