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Inverter Plasma Cutting Machine and Its Control Method in Arc Starting Stage

A technology of plasma cutting machine and inverter, which is applied in the fields of cutting and welding, which can solve the problems of reducing the success rate of arc striking, increasing the cost, and increasing the size of the cutting machine, so as to reduce costs, ensure stability and improve the success rate of arc striking Effect

Active Publication Date: 2019-02-01
PANASONIC WELDING SYST TANGSHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the power of the current-limiting power resistor R and the capacity of the relay CR will cause the volume of the cutting machine to increase, and at the same time increase the cost
In addition, too large current-limiting power resistor resistance will reduce the success rate of arc ignition

Method used

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  • Inverter Plasma Cutting Machine and Its Control Method in Arc Starting Stage
  • Inverter Plasma Cutting Machine and Its Control Method in Arc Starting Stage
  • Inverter Plasma Cutting Machine and Its Control Method in Arc Starting Stage

Examples

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no. 1 example

[0020] First, the hardware structure of the inverter plasma cutting machine according to the first embodiment of the present invention will be briefly described. The inverter plasma cutting machine includes a controller and a power switching device (IGBT), and the controller controls the power switching device through a driving circuit.

[0021] The inverter plasma cutting machine of this embodiment also includes a voltage detection circuit for detecting the phase voltage of the three-phase AC power supply. The output terminal of the voltage detection circuit is connected with the controller. The voltage detection circuit can detect the phase voltage between any two phases. As the structure of the voltage detection circuit, it can be implemented in the form of a known voltage transformer combined with a rectification and filtering circuit. In addition, the voltage detection circuit can also be implemented in the form of a known control power transformer combined with a recti...

no. 2 example

[0031] The second embodiment of the present invention is described below. First, the hardware structure of the inverter plasma cutting machine of the second embodiment will be described. Like the first embodiment, the inverter plasma cutting machine includes a controller and a power switching device (IGBT), and the controller controls the power switching device through a driving circuit. The difference from the first embodiment is that the inverter plasma cutting machine also includes an operation panel for inputting cutting current. The operation panel is connected with the controller.

[0032] The software structure of the second embodiment is basically the same as that of the first embodiment (see figure 1 ), so the relevant description is omitted. It should be noted that, in this embodiment, the information related to the cutting condition is the second information related to the cutting current (also called preset current) input by the user through the operation panel...

no. 3 example

[0039] A third embodiment of the present invention is described below. First, the hardware structure of the inverter plasma cutting machine of the third embodiment will be described. Like the first embodiment, the inverter plasma cutting machine includes a controller and a power switching device (IGBT), and the controller controls the power switching device through a driving circuit. The difference from the first embodiment is that the inverter plasma cutting machine also includes a pressure sensor for detecting the pressure of the compressed air used for cutting. The pressure sensor is connected with the controller.

[0040] The software structure of the third embodiment is basically the same as that of the first embodiment (see figure 1 ), so the relevant description is omitted. It should be noted that, in this embodiment, the information related to the cutting condition is the third information related to the pressure of the compressed air for cutting.

[0041] Next, r...

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Abstract

The invention provides an inverter plasma cutting machine. It includes a controller and a power switch device, the controller controls the power switch device through a drive circuit, and the controller includes: an acquisition unit for acquiring information related to cutting conditions; an operation unit for combining the information with the The corresponding relationship between the duty cycle of the power switching device and the obtained information is used to calculate the duty cycle of the power switching device; and a control unit, which is used to calculate according to the calculation unit The duty ratio is used to control the turn-on amount of the power switching device. It can effectively guarantee the stability and reliability of the arc guiding circuit, improve the success rate of arc striking, and reduce the cost of the inverter plasma cutting machine.

Description

[technical field] [0001] The invention relates to the field of welding and cutting, in particular to an inverter plasma cutting machine and a control method for the arc striking stage thereof. [Background technique] [0002] Plasma cutting machine is widely used in automobile, steel and other manufacturing industries because of its fast cutting speed, good cutting effect and ability to deal with various metals that are difficult to cut by oxygen cutting. In recent years, with the development of semiconductor power switching device (IGBT) technology, inverter plasma cutting machine has been popularized, which has the advantages of small size, light weight, high efficiency and energy saving. In addition, the inverter plasma cutting machine uses the controller (MCU, DSP) to control the conduction of the IGBT through PWM (pulse width modulation), phase shifting or limited bipolar technology, so it also has the advantages of flexible control and high cutting precision . [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K10/00
CPCB23K10/00B23K10/006
Inventor 刘树雨何双旺何艳红石增光陈超
Owner PANASONIC WELDING SYST TANGSHAN
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