CN215966800U - Gas shield welding constant-pressure current-limiting control structure - Google Patents
Gas shield welding constant-pressure current-limiting control structure Download PDFInfo
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- CN215966800U CN215966800U CN202121163666.0U CN202121163666U CN215966800U CN 215966800 U CN215966800 U CN 215966800U CN 202121163666 U CN202121163666 U CN 202121163666U CN 215966800 U CN215966800 U CN 215966800U
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Abstract
The utility model discloses a constant-voltage current-limiting control structure for gas-shielded welding, which comprises a voltage PI regulator, a first current PI regulator, a second current PI regulator, a comparison arithmetic unit, a drive circuit and a welding machine output, wherein a given voltage is transmitted to the voltage PI regulator, the voltage PI regulator is electrically connected with the first current PI regulator, and a limited current is transmitted to the second current PI regulator, the first current PI regulator and the second current PI regulator are both connected with the comparison arithmetic unit, the comparison arithmetic unit is connected with the drive circuit, the drive circuit is connected with the welding machine output, and the welding machine output is respectively connected with the voltage PI regulator, the first current PI regulator and the second current PI regulator. The smaller current in the currents output by the first current PI regulator and the second current PI regulator is transmitted to the driving circuit through the comparison arithmetic unit, the maximum output current can be effectively controlled, and the generation of the larger short-circuit current in the short-circuit process is avoided, so that the power device is effectively protected from being damaged, and the reliability of the product is improved.
Description
Technical Field
The utility model relates to the field of carbon dioxide gas shielded welding machines, in particular to a constant-pressure current-limiting control structure for gas shielded welding.
Background
At present, a carbon dioxide gas shielded welding machine generally adopts a constant-voltage control mode, and generally adopts a voltage outer ring and a current inner ring control mode in order to realize the stability of welding voltage and the dynamic response of current output. The output of the voltage ring is connected to the input of the current ring, thereby realizing the double closed-loop control of the gas shielded welding. The control block diagram is shown in figure 1. And a stable electric arc is generated between the welding wire and the workpiece, so that the welding process of short circuit and arc burning of the welding wire is realized, the welding wire is enabled to melt, the welding wire is smoothly transited to the workpiece, and stable welding is realized. Under the control mode of constant voltage, when the workpiece is in short circuit with the welding wire or the contact tip, the voltage ring outputs the maximum, so that the current ring is given the maximum, and the welding machine outputs the maximum current. The power modules such as IGBT on the primary side can be possibly damaged by overlarge short-circuit current, in order to prevent the damage of the IGBT on the primary side caused by the overlarge current, a current transformer is generally used on the primary side for monitoring, when the current exceeds a set value, the output of an inverter is limited, so that the current is limited to a specific value, and the short-circuit current is generally 650 DEG at the moment～900A. The disadvantages of this approach are: 1: a current transformer needs to be externally connected, so that the cost is increased; 2: the external current sensor adopts the connection mode of the wire harness, so that connection faults are easy to generate, and the reliability is reduced.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides a constant-pressure current-limiting control structure for gas shield welding.
The utility model adopts the following technical scheme:
a constant-voltage current-limiting control structure for gas-shielded welding comprises a voltage PI regulator, a first current PI regulator, a second current PI regulator, a comparison arithmetic unit, a driving circuit and a welding machine output.
Preferably, the output of the welder can feed back the output voltage to the voltage PI regulator and the output current to the first current PI regulator and the second current PI regulator.
Preferably, the currents output by the first current PI regulator and the second current PI regulator can be compared in a comparison operator, and the comparison operator supplies a smaller current of the currents output by the first current PI regulator and the second current PI regulator to the driving circuit.
The utility model has the beneficial effects that:
according to the gas shield welding constant-voltage current-limiting control structure, the smaller current of the currents output by the first current PI regulator and the second current PI regulator is transmitted to the driving circuit through the comparison arithmetic unit, the maximum output current can be effectively controlled, the generation of the larger short-circuit current during short circuit is avoided, the power device is effectively protected from being damaged, and the reliability of the product is improved.
Drawings
Fig. 1 is a schematic diagram of a constant voltage control method in the prior art.
Fig. 2 is a schematic diagram of the present invention.
Detailed Description
The utility model is described in detail below with reference to the accompanying drawings:
with reference to fig. 2, a control structure for constant voltage and current limiting in gas-shielded welding includes a voltage PI regulator, a first current PI regulator, a second current PI regulator, a comparison operator, a driving circuit and a welder output, wherein a given voltage is sent to the voltage PI regulator, the voltage PI regulator is electrically connected to the first current PI regulator, and a limited current is sent to the second current PI regulator, the first current PI regulator and the second current PI regulator are both connected to the comparison operator, the comparison operator is connected to the driving circuit, the driving circuit is connected to the welder output, and the welder output is respectively connected to the voltage PI regulator, the first current PI regulator and the second current PI regulator.
The output of the welding machine can feed back the output voltage to the voltage PI regulator, and the output current is fed back to the first current PI regulator and the second current PI regulator.
The currents output by the first current PI regulator and the second current PI regulator can be compared in a comparison arithmetic unit, and the comparison arithmetic unit transmits the smaller current of the currents output by the first current PI regulator and the second current PI regulator to the driving circuit.
The limited current is determined according to an actual welding machine, for example, when normal welding is carried out, the peak value of the general short-circuit current is smaller than 600A, and the limited current value is set to be 650A.
Below the defined current value, the actual current output is the welding current. When the limit current value is exceeded, the actual current is output as the limit current value.
And the comparison arithmetic unit transmits the smaller current of the currents output by the first current PI regulator and the second current PI regulator to the driving circuit so as to control the output of the welding machine. The output characteristic is realized below a limit current value and is a constant voltage characteristic, and when the limit current value is exceeded, the output characteristic is a constant current characteristic.
The utility model can automatically convert the output of the welding machine into a constant current state in a short circuit state, thereby avoiding overlarge short circuit current and effectively protecting a power device from being damaged.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (1)
1. A control structure for constant-voltage current limiting of gas-shielded welding is characterized by comprising a voltage PI regulator, a first current PI regulator, a second current PI regulator, a comparison arithmetic unit, a driving circuit and welding machine output, wherein a given voltage is sent to the voltage PI regulator, the voltage PI regulator is electrically connected with the first current PI regulator, a limited current is sent to the second current PI regulator, the first current PI regulator and the second current PI regulator are both connected with the comparison arithmetic unit, the comparison arithmetic unit is connected with the driving circuit, the driving circuit is connected with the welding machine output, and the welding machine output is respectively connected with the voltage PI regulator, the first current PI regulator and the second current PI regulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121163666.0U CN215966800U (en) | 2021-05-27 | 2021-05-27 | Gas shield welding constant-pressure current-limiting control structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121163666.0U CN215966800U (en) | 2021-05-27 | 2021-05-27 | Gas shield welding constant-pressure current-limiting control structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215966800U true CN215966800U (en) | 2022-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121163666.0U Active CN215966800U (en) | 2021-05-27 | 2021-05-27 | Gas shield welding constant-pressure current-limiting control structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215966800U (en) |
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2021
- 2021-05-27 CN CN202121163666.0U patent/CN215966800U/en active Active
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