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Driving circuit

A driving circuit and driving module technology, which is applied in arc welding equipment, manufacturing tools, welding equipment, etc., can solve the problem of low secondary inverter frequency

Active Publication Date: 2015-07-01
SHANGHAI HUGONG ELECTRIC WELDING MACHINE MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the isolation of the secondary inverter drive circuit and the output circuit of the welding power supply, due to the relatively low frequency of the secondary inverter, the common implementation method is to use optocoupler isolation, but this solution needs to add a set of independent power supply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0027] Such as figure 2 As shown, a driving circuit includes a pulse square wave generator MD1 and two drive modules MD2, MD3; the first input terminals IN1 of the drive modules MD2 and MD3 are respectively connected to the output terminal OUT of the pulse square wave generator MD1, driving The second input terminal IN2 of the module MD2 is connected to the external low-frequency driving signal DRIVEA, and the second input terminal IN2 of the driving module MD3 is connected to the external low-frequency driving signal DRIVEB.

[0028] The driving circuit can realize the purpose of simultaneously driving two power transistors, that is, when the external low-frequency driving signals DRIVEA and DRIVEB are in phase, it can drive two parallel-connected power transistors, and when the external low-frequency driving signals DRIVEA and DRIVEB are complementary, it can drive a bridge arm The power tube on the top realizes the driving of the power tube of the half-bridge inverter circ...

Embodiment 3

[0031] Such as image 3 As shown, a drive circuit includes a pulse square wave generator MD1 and four drive modules MD2, MD3, MD4 and MD5; the first input terminals IN1 of the drive modules MD2, MD3, MD4 and MD5 are respectively connected to the pulse square wave generator The output terminal OUT of the device MD1, the second input terminal IN2 of the drive module MD2 is connected to the external low-frequency drive signal DRIVEA, the second input terminal IN2 of the drive module MD3 is connected to the external low-frequency drive signal DRIVEB, and the second input terminal IN2 of the drive module MD4 is connected to the external The low-frequency driving signal DRIVEC, the second input terminal IN2 of the driving module MD5 is connected to the external low-frequency driving signal DRIVED.

[0032] The above drive circuit can drive four power tubes at the same time. In the driving circuit, the internal structural circuit diagram and working principle of each driving module ...

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Abstract

The invention discloses a driving circuit which comprises a pulse square-wave generator and at least one driving module. The output end of the pulse square-wave generator is connected with the first input end of the driving module, the pulse square-wave generator inputs high-frequency square-wave pulse signals to the first input end of the driving module, and the driving module is further provided with a second input end used for inputting low-frequency driving signals. The driving module comprises a signal conversion circuit unit and a driving circuit unit, the signal conversion circuit unit is connected with the driving circuit unit through a pulse transformer, when the second input end of the driving module is in a high level state, the signal conversion circuit unit converts the low-frequency driving signals and the high-frequency square-wave pulse signals into alternating-current high-frequency pulse signals, isolation and voltage transformation are carried out on the alternating-current high-frequency pulse signals by the pulse transformer, and the pulse transformer outputs driving voltage signals through the driving circuit unit. The pulse transformer is used by the driving circuit to achieve signal isolation, an extra independent power source is not required, and the power source can be saved.

Description

technical field [0001] The invention relates to a driving circuit, in particular to a low-frequency inverter driving circuit. Background technique [0002] Argon arc welding has unique advantages in welding non-ferrous metals and their alloys, superalloys, titanium and titanium alloys and other materials, so with the rapid development of non-ferrous metals in today's industry, aluminum-magnesium and its alloys, copper and its alloys and The proportion of non-ferrous metals such as titanium and its alloys in industrial production is increasing, so people's demand for argon arc welding power supplies, especially AC and DC argon arc welding power supplies, is also increasing. In order to obtain good AC / DC welding performance and working stability of the power supply, the driving circuit of the secondary inverter is very important. In the isolation of the secondary inverter drive circuit and the output circuit of the welding power supply, due to the relatively low frequency of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/10B23K9/16
CPCB23K9/1043B23K9/16
Inventor 不公告发明人
Owner SHANGHAI HUGONG ELECTRIC WELDING MACHINE MFG