Digitally-controlled multifunctional inverted arc welding machine

Abstract

The invention relates to an inverted arc welding machine and particularly relates to a digitally-controlled multifunctional inverted arc welding machine which has high working efficiency and fast dynamic response. The digitally-controlled multifunctional inverted arc welding machine comprises a main circuit system (1) of an IGBT (Insulated Gate Bipolar Translator) inverting circuit (101), a digital control system (2) and a man-machine switching system (3), wherein the digital control system (2) adopts a digital signal controller (4) as a core control unit and further comprises an auxiliary circuit (5) connected with the digital signal controller (4), a signal conditioning circuit (6) for processing collected data of the main circuit system (1), and an IGBT driving circuit (7) for carrying out driving control on the IGBT inverting circuit (101); the type of the digital signal controller (4) is dsPIC30F4011 and the digital signal controller (4) is connected with the IGBT inverting circuit (101) through the IGBT driving circuit (7); and the digital signal controller (4) is used for adjusting and controlling the main circuit system (1).

Description

technical field [0001] The invention relates to an inverter arc welding machine, in particular to a digitally controlled multifunctional inverter arc welding machine. Background technique [0002] Inversion and rectification are two opposite concepts. Rectification is the process of converting alternating current into direct current, while inverter is the process of changing direct current into alternating current. The arc welding power supply using inverter technology is called inverter welding machine, also known as inverter welding machine. It is called an inverter arc welding machine. The inverter process requires high-power electronic switching devices, and the inverter welding machine that uses the insulated gate bipolar transistor IGBT as the switching device is called an IGBT inverter welding machine. Inverter welding and cutting equipment is composed of inverter power supply and external equipment. Inverter power supply is the main equipment of inverter welding an...

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Problems solved by technology

The current inverter welding machine has been developed to the fourth generation of products. The digitally controlled inverter welding machine has overcome many problems in the analog control of the previous three generations of products to a certain extent. The number of devices is large, and the parameters of the controller are determined by the parameters of discrete components such as resistors and capacitors. The debugging of the controller is complicated and the flexibility is poor. It is difficult to achieve high-precision control; and to achieve multi-functional selection, not only is the circuit design difficult, but the compatibility and coordination of circuit components is also very large

[0004] However, in the existing digitally controlled inverter welding machines, a digital signal processor (dsp) is used to control the circuit, which has strong numerical calculation capabilities, but its event management capabilities are poor, and the output characteristics are single. Although It can realize the precise control of single function, but it still can't realize the multi-function well; at the same time, due to technical limitations, it adopts PFM or PWM single-mode control switching power supply, although the most widely used PWM mode It has the advantages of low noise and high efficiency at full load, but it cannot play its characteristics well at low load, and its efficiency is far lower than that of PFM mode control, which affects the improvement of inverter welding machine efficiency.

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