Micro-beam plasma arc welding power-supply double closed-rings cooperation control structure

Abstract

A double closed loop cooperative control structure of a micro-plasma arc welding power source of the invention relates to the technical field of welding source and comprises an input rectifying filter circuit, a power switching element, an intermediate frequency transformer, an output rectifying circuit, and both ends of an output filter condenser (1) are respectively connected with the output rectifying circuit and one input end of a cooperative control closed loop circuit (3); the other input end of the cooperative control closed loop circuit (3) is connected with the detection end of a current control closed loop circuit (2), both output ends of the cooperative control closed loop circuit (3) are respectively connected with the input end of the current control closed loop circuit (2) and a tungsten bar (13), the feedback end of the cooperative control closed loop circuit (3) is connected with the power switching element, and the output end of the current control closed loop circuit (2) is connected with a workpiece (12). The double closed loop cooperative control structure reduces the volume and the weight of the micro-plasma arc welding power source and meets the demands of energy conservation and environmental protection, thereby realizing the technological parameter control of thin and precise structural member micro-plasma arc welding.

Description

technical field [0001] The invention relates to the technical field of welding power sources, in particular to a double closed-loop cooperative control structure of a micro-beam plasma arc welding power source. Background technique [0002] A key technical problem of micro-beam plasma arc welding in the small current range is the arc stability problem in the case of small current, and one of the main means to solve this key technical problem is to use high-frequency pulse current, modern inverter structure welding Because the power supply is limited by the inverter frequency, it is difficult to achieve high-frequency output. The existing analog transistor power supply can realize the output of high-frequency pulses, but the power transistor power supply of the main circuit composed of power frequency AC transformation, rectification and filtering Some of them are bulky and heavy, and cannot meet the requirements of energy conservation and environmental protection. [0003] ...

AI Technical Summary

Problems solved by technology

On the basis of realizing the energy saving and environmental protection of the micro-beam plasma arc welding machine and completing the analog high-frequency pulse output, further solve the cooperative work problem of the main circuit of the inverter welding power supply and the main circuit of the analog transistor power supply to achieve the goal of two main circuits Small current range micro-beam plasma arc welding under the condition of cooperative control, stable combustion of the arc, and the external characteristics of the steep drop power supply, welding equipment to solve key technical problems such as deformation and burn-through during precision welding of ultra-thin, ultra-fine and other fine structure components

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