IGBT single-tube inversion manual arc welding machine and circuit structure thereof

Abstract

The invention relates to an IGBT single-tube inversion manual arc welding machine and a circuit structure of the IGBT single-tube inversion manual arc welding machine. After a pin sheath sleeves an IGBT and a fast recovery diode, the IGBT and the fast recovery diode are welded to a main circuit board, the manufactured main circuit board is coated with insulating paint, a digital display meter anda control panel of the digital display meter are placed into a protective cover of the digital display meter and control panel, and dustproof protection treatment is carried out in the manner of pouring an epoxy filling material, so that circuit failure caused by the invasion of conductive dust is prevented. A large-air volume high-speed direct-current cooling fan is arranged, and an air duct formed among the main circuit board, a heat dissipation device of the IGBT and a heat dissipation device of the fast recovery diode is utilized, so that the cooling efficiency of heating main power key parts is improved, the load duration rate of the welding machine is improved, and the problem that the welding time is short is solved. Due to the adoption of novel control circuits of electrifying buffering and overvoltage protection, IGBT driving, a switching power supply, over-heat protection, output voltage and the like, the control and protection functions of the welding machine are better realized.

Description

technical field [0001] The invention relates to the structure and circuit design of an IGBT inverter manual arc welding machine. It belongs to the technical field of inverter welding machines. [0002] technical background [0003] Manual arc welding machines have a large sales volume and a wide range of applications. However, for this type of welding machine, different circuits, circuit boards and complete machine structure designs, different control principles and methods, layout and connection methods of circuit boards and complete machines, or different degrees of complexity of connection, the production process and production The process, etc. will be completely different. These will affect the performance, reliability, production efficiency and transportation costs of the product, and ultimately affect the market competitiveness of the product. [0004] At present, in the domestic and foreign markets, the rated current of small IGBT tube inverter manual arc welding m...

AI Technical Summary

Problems solved by technology

For this kind of welding machine products, if the design is not good, there will be some problems as follows: 1) Poor ability to resist network voltage fluctuations

For example, when the input power voltage of the power grid is low, such as below 180VAC, the welder cannot perform normal welding even if a thinner electrode is used.

This limits the application range of the welding machine to a certain extent.

When the power supply voltage is too high, if 380V is wrongly connected, the welding machine will be burned out; 2) The load continuity rate is low, and some welding machines can only reach 10-25%

Reason: The configuration of the cooling fan of the welding machine and the design of the cooling air passage of key components (such as IGBT and its radiator, fast recovery diode and its radiator, main transformer, etc.) are unreasonable

This results in a lower duty cycle for the welder to work, i.e. a shorter welding time

If the problem is serious, it will also cause the IGBT or fast recovery diode to explode or be damaged, and the inverter transformer will be burned out; 3) The dustproof performance is not good, which will reduce the reliability of the welding machine

After the inverter welding machine is used for a long time, some conductive metal dust on the work site will be adsorbed between the pins of the IGBT and the fast recovery diode device, resulting in a decrease in the creepage distance and failure of the device and the control circuit

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