Digitized variable-polarity welding power source based on SiC IGBT

Abstract

The invention provides a digitized variable-polarity welding power source based on SiC IGBT. The digitized variable-polarity welding power source is characterized in that the digitized variable-polarity welding power source comprises a main circuit and a control circuit. The main circuit comprises a three-phase rectifying filter circuit, an SiC IGBT primary inverter circuit, a high-frequency transformer, an SiC ultrahigh-frequency rectifying filter output circuit, an SiC IGBT secondary inverter circuit and a high-voltage arc stabilizing circuit which are sequentially connected; the control circuit comprises a controller, a control power supply module, a digitizing tablet, an SiC primary inverter driving module and an SiC secondary inverter driving module, wherein the digitizing tablet, theSiC primary inverter driving module and the SiC secondary inverter driving module are in signal connection with the controller; the digitizing tablet, the SiC primary inverter driving module and theSiC secondary inverter driving module are electrically connected with the control power supply module; the SiC primary inverter driving module is further connected with the SiC IGBT primary inverter circuit; and the SiC secondary inverter driving module is further connected with the SiC IGBT secondary inverter circuit. According to the digitized variable-polarity welding power source, an electricarc can be easy to reburn after being extinguished, the size is small, the conversion efficiency is high, and work is reliable and stable.

Description

technical field [0001] The invention relates to the technical field of welding power sources, and more specifically, relates to a digital polarity-changing welding power source based on SiC IGBT. Background technique [0002] The variable polarity welding power source was originally a new type of welding power source invented and developed by NASA for the development of the space shuttle. Now it is widely used in aerospace, automobile, train, ship and other industrial manufacturing fields. Aluminum, magnesium and their alloys have the advantages of small density, high specific rigidity, strong electromagnetic shielding ability, energy saving and environmental protection, etc., and are widely used in the above industrial manufacturing fields. Oxide film, stirred molten pool, very few pores, reduced tungsten electrode burning and stable welding arc, etc., have obvious advantages in various welding methods, and are ideal power sources for welding magnesium aluminum and its allo...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies in the prior art, and provide a digital polarity-changing welding based on SiC IGBT, which can solve the problem of instantaneous arc extinguishment and re-ignition when changing polarity, small size, high conversion efficiency, and reliable and stable operation. power supply

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