Parallel high-power pulse mig welding inverter power supply system based on dsp

Abstract

The invention relates to the high-frequency IGBT (insulated gate bipolar transistor) inversion technology based on a DSP (digital signal processor), in particular to a parallel type high-power impulse MIG (metal inert gas) welding inversion power supply system based on the DSP. The parallel type high-power impulse MIG welding inversion power supply system based on the DSP comprises a three-phase alternating-current input power grid, two main circuits in parallel connection and identical in circuit structure, control circuits, a DSP digital control module, an electric arc load and a human-machine interface module, each of the main circuits comprises an input rectifying filtering module, a high-frequency inversion module, a power voltage transformation module and an output rectifying filtering module, and the control circuits comprise voltage and current detection modules, fault protection modules, the DSP digital control module, the human-machine interface module and high-frequency driving modules. Output power of an impulse MIG welding inversion power supply is effectively improved by initially using the two the main circuits in parallel connection and adopting the advanced high-frequency IGBT inversion technology and the advanced DSP digital control technology. Additionally, the parallel type high-power impulse MIG welding inversion power supply system based on the DSP has the advantages of high output power, high production efficiency, high reliability and the like and is particularly applicable to efficient high-speed welding for large and thick plates.

Description

technical field [0001] The invention relates to a DSP-based high-frequency IGBT inverter technology, in particular to a DSP-based parallel high-power pulse MIG welding inverter power supply system. Background technique [0002] The development of arc welding power supply has gone through stages such as arc welding generator, AC arc welding transformer, silicon arc welding rectifier and arc welding inverter power supply. The arc welding inverter power supply adopts high-frequency inverter technology, which has the advantages of small size, light weight, high efficiency and energy saving, short control cycle, fast dynamic response of the whole machine, and precise control. Digitalization has revolutionized the performance of arc welding power supplies. However, the advantages of arc welding inverter power supplies have not been fully utilized because the existing technology has inherited more traditional analog control methods. In recent years, with the rapid development of d...

AI Technical Summary

Problems solved by technology

[0005] (1) The output power is small

[0006] (2) For large and thick plates, it is difficult to realize high-efficiency and high-speed welding of forming at one time

[0007] (3) Low production efficiency

[0008] For example, the DSP-based digital pulse welding power source control method with the patent No. 200810203848.9 adopts DSP digital control technology, but due to the limitation of the output power of a single inverter unit module, there are the above defects

[0009] Another example is the "Development of Digital Welding Machine for Pulse MIG Welding Based on DSP" (Lu Xiaoming, Xiong Jingqing, Li Jin, etc. Electric Welding Machine, 2009.02) in the existing technical literature. Although the pulse MIG welding system can realize the controllability of droplet transfer, its output power is small (peak current 250A), and it cannot realize high-efficiency and high-speed welding, so there are also the above defects

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