High-power two-wire pulse MIG inverter power supply system and digital cooperative control method thereof

Abstract

The invention discloses a high-power two-wire pulse MIG inverter power supply system and a digital cooperative control method thereof. The system comprises a host power supply and a slave power supply which are connected through a CAN bus, each of the host power supply and a slave power supply comprises a main circuit and a control circuit, each main circuit is formed by parallel connection of two or more full bridge inverters and comprises an input rectifying and filtering module, a high frequency inverting module, a power transformation module and an output rectifying and filtering module, each input rectifying and filtering module is connected with a three-phase alternating current input power grid, each output rectifying and filtering module is connected with an electric arc load, and each control circuit comprises a voltage and current detection module, a fault protection module, a DSP digital cooperative control module, a human-machine interface module and a high frequency driving module. The output power, the welding speed and the fusion covering efficiency of welding wires are doubly improved by adopting the main circuits formed by parallel connection of the full bridge inverters and in combination with the DSP digital cooperative control technology.

Description

technical field [0001] The invention relates to the technical field of high-efficiency and high-speed welding technology, in particular to a high-power twin-wire pulse MIG welding inverter power supply system and a digital cooperative control method thereof. Background technique [0002] With the rapid development of my country's national economy, in order to improve the welding efficiency and welding quality of important components and enhance the competitiveness of products in domestic and foreign markets, some large domestic enterprises have begun to import twin-wire high-efficiency automatic welding equipment from abroad. Double wire automatic welding process and equipment. In the prior art, thick and large structures often require several to dozens of layers of welds to fill the welding groove. From the perspective of performance and effect, there are many problems. Especially in the shipbuilding industry, pipeline, large steel structure and other industries, it is ofte...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide a high-power dual-wire pulse MIG welding inverter power supply system and its digital cooperative control method. The disadvantage of being too large is that it has the characteristics of large output current. The thick wire has a high melting coefficient and a large droplet volume under the action of high current heat, and the molten pool is wide and deep, which can quickly fill the groove of large weldments. The high-power double arc burns on a molten pool, and the total welding heat input is large, which can greatly improve the welding speed and production efficiency. It is suitable for welding of medium and thick plates, especially the rapid welding of one-time forming

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