Full digit numerical control inversion welding machine

Abstract

The invention relates to a totally digitalized numerical control inversion welder, which belongs to the welding technical field. In the invention, a current signal processing module and a voltage signal processing module respectively collect the welding current and voltage, and unify a current signal and a voltage signal into a 0-5V direct-current signal which is then transmitted to an ARM microprocessor; the ARM microprocessor generates a PWM impulse signal according to the current and the voltage which are obtained through measurement, and the PWM impulse signal is transmitted to an IGBT driving module; the IGBT driving module converts the PWM impulse signal into a signal which can directly drive an IGBT tube to work, so as to control the output of an inverter; a human-computer interface display module is connected with the ARM microprocessor, so as to display the information such as the welding condition, the historic records and the like; a key input module converts the key information into a high-low level signal, and simultaneously generates key interruption; a security action recognition module judges the alarming content and outputs a control signal to protect the safety of the welding equipment and the welding personnel. The total digitization of the welder is realized through the ARM microprocessor.

Description

technical field [0001] The invention relates to a device in the field of welding technology, in particular to an all-digital numerical control inverter welding machine. Background technique [0002] In the past ten years, the development of modern power electronics technology, computer microelectronics information and automation control technology has greatly promoted the improvement of welding equipment control technology and automation level. However, the research and manufacturing level of arc welding equipment has nothing to do with the booming national economy Still doesn't fit. In terms of product variety, establishment, quality, performance and automation, it is still far from meeting the requirements of various departments, especially in terms of high-speed, high-efficiency, and high-performance digitally controlled welding equipment, there is still a big gap with foreign countries. . [0003] The power circuit structure of the traditional inverter welding machine ...

AI Technical Summary

Problems solved by technology

[0004] After more than 20 years of application and development, analog control technology has been very mature, but it has many inherent shortcomings: the control circuit has many components, the circuit is complex, and the volume occupied is large; the flexibility is poor, and after the hardware circuit is designed, the control strategy It cannot be changed; due to the difference in the characteristics of the used devices, the power supply consistency is poor and the debugging cycle is long; due to the temperature stability and aging problems of the analog devices, the control accuracy of the analog devices is reduced and the reliability is reduced; the drift of the operating point of the analog devices , leading to the drift of system parameters; it is difficult to realize the parallel connection of inverter power supply

[0005] Although there have been many digital welding machines in China, most of them use digital electronic power switching devices, such as MOSFET or IGBT, in the main circuit of the welding machine power supply, and some use MCU (single-chip microprocessor) or DSP (digital power switch) in the control circuit. Signal processor) as the core, in view of the limitations of the single-chip microprocessor and DSP, only part of the digitalization of the welding machine can be realized, that is, the coexistence of analog and digital

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