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Carrier line short-circuit protection control method and circuit for carrier control welding machine

A control circuit and short-circuit protection technology, which is applied in emergency protection circuit devices, overvoltage-responsive protection, emergency protection devices for automatic disconnection, etc., can solve the short circuit between carrier wire and welding cable, carrier wire and welding base material Problems such as short circuit and frequent overcurrent impact of welding equipment

Pending Publication Date: 2021-05-14
SHANGHAI HUGONG ELECTRIC WELDING MACHINE MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The welding cable is used for the energy output of the welding power supply and the common terminal of the carrier line signal; the carrier line is used to provide power and signal interaction for the wire feeding device; the actual use site environment is harsh, which may easily cause a short circuit between the carrier line and the welding base material, or the carrier line short circuit between the wire and the welding cable, causing damage to the welding equipment
At present, the methods commonly used in the event of a short circuit include: overcurrent protectors, collecting current signals on the carrier line. Under the condition that the short circuit fault is not eliminated, the overcurrent protectors can be artificially opened again or artificially shorted to lose their effect; The current signal on the carrier line is used for protection and control. After the protection action of this method, there will be no current on the carrier line, and the control circuit will open again if the overcurrent signal is not detected. If the short circuit still exists, it will operate frequently, and the welding equipment will frequently have overcurrent. shock

Method used

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  • Carrier line short-circuit protection control method and circuit for carrier control welding machine
  • Carrier line short-circuit protection control method and circuit for carrier control welding machine
  • Carrier line short-circuit protection control method and circuit for carrier control welding machine

Examples

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Effect test

specific Embodiment 1

[0042] A kind of carrier line short circuit protection control circuit for carrier wave control welding machine of the present application, such as figure 1 As shown, it includes AC input unit, rectification conversion unit, detection power supply unit, rectification trigger unit, short circuit detection unit, main circuit unit, and main circuit trigger unit. The trigger unit and the rectification trigger unit are connected; the rectification conversion unit is respectively connected with the AC input unit and the rectification trigger unit, and leads out to the carrier terminal; the main circuit unit is connected with the AC input unit, the main circuit trigger unit, and leads out to the welding cable end and the busbar end , the main circuit unit includes AC input; the detection power unit is connected to the welding cable end, the bus bar end, and the AC input unit; the wire feeding device is respectively connected to the welding cable end, the bus bar end, and the welding t...

specific Embodiment 2

[0055] A kind of carrier line short circuit protection control circuit for carrier wave control welding machine of the present application, such as figure 2 As shown, the AC input unit provides AC power to the rectification conversion unit and the detection power supply unit, and the rectification conversion unit performs first rectification and filtering on the AC power, and then provides DC power to the carrier terminal and the welding cable terminal. Similarly, the detection power supply unit provides DC power to the carrier wire end and the welding cable end after performing second rectification and filtering on the AC power.

[0056] The carrier line end and the welding cable end serve as the two input ends of the short-circuit detection unit at the same time. The short-circuit detection unit detects the first voltage between the carrier line end and the welding cable end, compares it with the first preset value, and outputs according to the comparison result The control...

specific Embodiment 3

[0097] A carrier line short-circuit protection control method for a carrier-controlled welding machine of the present application, such as Figure 7 As shown, it includes detecting the first voltage at both ends of the carrier line and the welding cable. When the first voltage is less than the first set threshold, the carrier line power supply and the main circuit are turned off, and the welding machine is stopped; the carrier line circuit applies the detection power. If The carrier line is in a short-circuit state. When the detection voltage is less than the second set threshold, keep the carrier line power off; Circuit blocked.

[0098] In a specific embodiment of the present application, the first set threshold and the second set threshold are equal.

[0099] Such as Figure 7 shown, including the following steps:

[0100] S1, the carrier line power supply provides detection voltage;

[0101] S2. Detecting the first voltage at both ends of the carrier line and the weldi...

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PUM

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Abstract

The invention discloses a carrier line short-circuit protection control method and circuit for a carrier control welding machine, and the method comprises the steps: detecting a first voltage at two ends of a carrier line and a welding cable, and when the first voltage is smaller than a first set threshold value, turning off a carrier line power supply and a main loop, and stopping the work of the welding machine; applying a detection power supply to the carrier line loop, and if the detection voltage is smaller than a second set threshold value, keeping the carrier line power off when the carrier line is in a short-circuit state; and if the detection voltage is greater than or equal to the second set threshold, releasing the short-circuit state of the carrier line, starting the carrier line power supply, and releasing the main loop blocking. Continuous protection in a short circuit state is guaranteed, repeated starting is avoided, and safety is improved.

Description

technical field [0001] The invention relates to the technical field of welding machine control, in particular to a carrier line short-circuit protection control method and circuit for a carrier-wave control welding machine. Background technique [0002] At present, the welding machine is an indispensable tool in engineering. The welding power supply and the wire feeding device are connected by a carrier line and a welding cable, and a bus bar is drawn from the welding power source. The wire feeding device is connected to the welding torch. , A current loop is formed between the welding torch and the bus bar. [0003] The welding cable is used for the energy output of the welding power supply and the common terminal of the carrier line signal; the carrier line is used to provide power and signal interaction for the wire feeding device; the actual use site environment is harsh, which may easily cause a short circuit between the carrier line and the welding base material, or th...

Claims

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Application Information

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IPC IPC(8): H02H3/10H02H3/20H02H1/00B23K37/00
CPCB23K37/00H02H1/0007H02H3/10H02H3/20
Inventor 舒振宇翟玉喜
Owner SHANGHAI HUGONG ELECTRIC WELDING MACHINE MFG
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