High-frequency inversion stud welding equipment and controlling means thereof

Abstract

The invention discloses a device for welding a high-frequency inverter stud and a method for controlling the same. The device for welding the high-frequency inverter stud comprises a triphase rectifying circuit, an inversing circuit, a high-frequency transformer, a rectifying and filtering circuit, a DSP controller and a current feedback circuit. The current feedback circuit samples from the output end of the rectifying and filtering circuit, and a sampling value is input to the signal input end of the DSP controller; the inversing circuit comprises an IGNT bridge switching circuit and an isolated drive circuit; and the DSP controller can generate PWM signals, and the on-off of the IGNT bridge switching circuit is controlled by the isolated drive circuit. The invention provides the device for welding the high-frequency inverter stud and the method for controlling the same, and the device has the advantages of small volume and high power of the transformer, relative simple hardware circuit, high control accuracy, long service life of electrical elements, and good reliability and stability.

Description

[technical field] [0001] The present invention relates to welding equipment, in particular to a high-frequency inverter stud welding equipment and its control method. The high-frequency inverter stud welding equipment is used for welding between metal components and studs, and is mainly used in automobiles and ships. , Sheet metal manufacturing and other production fields. [Background technique] [0002] Stud welding machine is divided into three categories, one is energy storage stud welding machine, the other is long-cycle stud welding machine, the welding time is 300-2000mS, and the duty cycle is about 30%; the third is short-cycle stud welding machine , The welding time is 30-200mS, and the duty cycle is about 10%. It is usually used for stud welding in automobile, ship and sheet metal manufacturing industries. At present, the arc stud welding machine controlled by power frequency silicon controlled rectifier and the three-phase inverter high frequency arc stud welding ...

AI Technical Summary

Problems solved by technology

In the hardware circuit using the pulse width modulation chip, the hardware circuit is complicated, and it is inconvenient to adjust the welding performance

During work, the pulse width signal is adjusted from the maximum to the required width, and the adjustment rate is difficult to grasp and control, so it is easy to generate high-frequency spikes, which will damage the IGBT and diode, and reduce the reliability of the whole machine.

Because the sampling frequency of the pulse width modulation chip and the adjustment frequency of the PWM signal are relatively low (only 20,000 times / s and 1,000 times / s), the adjustment speed of the output current and voltage is slow, the current control accuracy is not high, and the welding effect is not good. Well, its response speed cannot meet the requirements of short-cycle stud welding machines, it is difficult to realize complex welding processes, and the welding quality cannot be guaranteed

At present, the welding current of the high-frequency inverter stud welding machines produced in China is mostly below 1500A, which is difficult to meet the needs of production

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