Arc welding power source current double-closed-loop control method

A technology of double closed-loop control and arc welding power supply, which is applied in the direction of arc welding equipment, manufacturing tools, welding equipment, etc., can solve the problem that the output current cannot be adjusted accurately, and achieve the effect of improving response speed and avoiding damage

Active Publication Date: 2016-05-25
DALIAN UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

The constant peak current control realizes real-time control of the power device current through the peak current feedback of the primary side, but only the peak current feedback cannot accurately adjust the output current

Method used

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  • Arc welding power source current double-closed-loop control method
  • Arc welding power source current double-closed-loop control method
  • Arc welding power source current double-closed-loop control method

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Embodiment Construction

[0026] The specific implementation manners of the patent of the present invention are described below in conjunction with the accompanying drawings.

[0027] like figure 1 The topology of the arc welding inverter power supply shown is shown in the figure. The main circuit can be regarded as a DC-DC conversion process. The current control system mainly consists of the following parts: current sampling and conditioning circuit, current control module, current drive circuit, and current double closed loop respectively. It is the current outer loop with current feed-forward control and the current inner loop to realize the current regulation of the main circuit. The arc welding inverter power supply of the present invention complies with the ZX7-400 standard, and the main parameters of the system are shown in Table 1.

[0028] Table 1 The main parameters of the system

[0029] parameters

value

Input voltage U i / V

540

Switching frequency f s / k...

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Abstract

The invention provides an arc welding power source current double-closed-loop control method and belongs to the technical field related to arc welding power sources and current control. The control method includes that when an arc welding power source works, a current inner loop samples original side peak current of a transformer in each switch period and adjusts current of a main circuit in real time; a current outer loop with current feed-forward control controls output current of the arc welding power source, and when the arc welding power source works stably, a feed-forward compensation link does not work and only a PI adjuster participates in adjusting; when arc load changes, the feed-forward compensation link works to increase response speed of the output current. By using the control method, damage to the transformer and power devices caused by overcurrent of the main circuit is avoided, and current outer loop control with a current feed-forward link can adapt to changes of the arc load quicker. The arc welding power source current double-closed-loop control method is suitable for arc welding power sources with high requirements on current speed and accuracy.

Description

technical field [0001] The invention belongs to the related technical field of arc welding power supply and current control, and relates to the design of a current double closed-loop control method of arc welding power supply. Background technique [0002] Inverter welding machines are divided into three categories according to welding methods: fusion welding, pressure welding and brazing. As a kind of fusion welding method, arc welding refers to a welding method that uses arc as a welding heat source. Because arc can easily and effectively convert electrical energy into thermal energy and mechanical energy required in the working process, arc welding welding method is widely used in the country. Occupy a major position in life and production practice, and the ratio is as high as 60% in the total welding production in developed countries. The arc welding inverter power supply is the core component of arc welding, which provides electric energy to the arc and meets the elect...

Claims

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Application Information

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IPC IPC(8): B23K9/10
CPCB23K9/1012
Inventor 李国锋杨玉甜王志强
Owner DALIAN UNIV OF TECH
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