Basic knowledge of IGBT inverter welding machine
逆变焊机基础知识 Basic knowledge of IGBT inverter welding machine
关于逆变焊机 I. About inverter welding machine
、什么叫逆变焊机 1. What is an inverter welding machine
Arc welding power source using inverter technology is called inverter welding machine. 作为开关器件的逆变焊机称为IGBT逆变焊机。 The inverter process requires high-power electronic switching devices. An inverter welding machine using IGBT as the switching device is called an IGBT inverter welding machine.
、逆变焊机工作原理 2.Working principle of inverter welding machine
Rectifier filter circuit: rectify the three-phase 380V / 50Hz AC power to obtain 540V DC power;
Inverter circuit: The IGBT module is used to convert the DC power obtained in the previous step into an intermediate frequency AC power of several thousands to tens of thousands Hz (the welding machine frequency is usually 20K Hz);
IF transformer: step down the IF AC power;
Output after rectification: The AC power after the voltage reduction of the intermediate frequency transformer is converted into DC power, and then the output can be welded after the output reactor.
、逆变焊机整个电路工作过程如下： 3. The whole circuit working process of inverter welding machine is as follows:
AC ---- DC ---- AC ---- Transformer ------- DC ----- Output
、 IGBT 逆变后焊机的优势： 4. Advantages of IGBT inverter welding machine:
1. 20kHZ AC power is obtained after IGBT inversion. Increasing the frequency can effectively reduce the size of the transformer. Therefore, compared with the traditional welding machine, the weight and cost are greatly reduced.
2. The unnecessary magnetic loss of the transformer is reduced, and the efficiency is improved. Reduce the wasted power of the welding machine itself. Power saving effect is obvious. (The volume and weight of traditional welding machine transformers account for most of the whole, the electromagnetic conversion efficiency is low, and the power is wasted.)