A welding and cutting integrated power supply

Abstract

The invention discloses a welding and cutting integrated power supply. The welding and cutting integrated power supply comprises a rectifying circuit, an inverter circuit, a welding and cutting switching circuit, a welding circuit, a cutting circuit and a control circuit, wherein the rectifying circuit converts a three-phase input voltage into a high-voltage direct current, the inverter circuit inverts the high-voltage direct current into high-frequency square waves with adjustable pulse width, the welding and cutting switching circuit is used for connecting the output of the inverter circuit to the corresponding welding circuit or the corresponding cutting circuit during welding and cutting modes, the functions of voltage reduction, isolation and rectification and filter are achieved through the welding circuit and the cutting circuit, finally the stable direct current is output, the control circuit is responsible for collecting all the electrical quantities and controlling the output of the controlling quantity of the system, and stable and reliable operation of the welding and cutting integrated power supply is realized. According to the welding and cutting integrated power supply, an MOSFET serves as a main switch device, and the conversion of a welding power supply and a cutting power supply is realized by switching a transformer set and a rectification filter network at the primary side. The welding and cutting integrated power supply has the advantages of being small in size, high in conversion efficiency, good in harmonic characteristic of grid side currents and the like, and the power density of the welding and cutting integrated power supply is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of welding and cutting, and more specifically relates to a welding and cutting integrated power supply. Background technique [0002] The welding and cutting integrated power supply is a device that can provide power for arc welding and plasma cutting at the same time. It is mainly used for welding and cutting operations on various non-ferrous metals and their alloys, and has been widely used in the automobile and shipbuilding industries. [0003] At present, the input rectification and transformation link of inverter welding and cutting power supply generally adopts uncontrolled rectification or phase-controlled rectification. The input current has high harmonic content and low power factor, which makes it difficult to meet the requirements of the power grid for electromagnetic compatibility of equipment. Although the rectifier using IGBT full-controlled power electronic switch and high-frequency PWM techno...

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Problems solved by technology

[0006] Aiming at the defects of the prior art, the purpose of the present invention is to provide a welding and cutting integrated power supply, which aims to solve the problems of high input current harmonic content, low power factor, low efficiency and low power density of the welding and cutting integrated power supply in the prior art. question

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