Alternating current and direct current composite arc welding power source, welding system and control method

Abstract

The embodiment of the invention discloses an alternating current and direct current composite arc welding power source, a welding system and a control method. The arc welding power source comprises an all-in-one machine integrating an alternating-current power source and a direct-current power source, and the all-in-one machine comprises a direct-current unit, an alternating-current unit and a remote control communication port; the direct current unit comprises a first switching device, a first voltage conversion device, a silicon controlled rectifier circuit, a first filter circuit, a direct current output port, a main control board, a local control panel, a digital communication board and a selection switch; and the alternating current unit comprises a second switching device, a rectifier, a primary inverter, a second voltage conversion device, a secondary rectification circuit, a secondary inverter, a second filter circuit, an alternating current output port, a digital main control board, a driving board, a secondary driving board and a local control digital panel. The invention has the beneficial effects of the utility model are that the AC power supply and the DC power supply are integrated together, the size and the power consumption are reduced, the characteristics of a thyristor type and an IGBT inversion type are considered, and the complexity of a control system is reduced through interaction between a remote control communication port and an external control device.

Description

technical field [0001] The invention relates to the technical field of welding power sources, in particular to an AC-DC composite arc welding power source, a welding system and a control method. Background technique [0002] At present, arc welding power supplies are generally divided into two types: AC arc welding power supply and DC arc welding power supply, which are distinguished according to their output current characteristics. The output of AC arc welding power supply is square wave alternating current, and the output of DC arc welding power supply is direct current. [0003] In terms of power rectification, the above-mentioned power supplies are further divided into thyristor type and IGBT inverter type. The thyristor type model has the characteristics of strong welding penetration, high durability, and low maintenance cost; the IGBT inverter type has the characteristics of small size and power saving. [0004] At present, welding power sources are manufactured with...

AI Technical Summary

Problems solved by technology

However, this welding method uses two independent power supplies for power supply, and the two power supplies are respectively connected to the wire feeding mechanism, resulting in problems such as complex control system, large volume, large placement area, large grid interference, and high power consumption.

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