CN204430525U - The striking detection of electric arc welding equipment and push current control circuit - Google Patents
The striking detection of electric arc welding equipment and push current control circuit Download PDFInfo
- Publication number
- CN204430525U CN204430525U CN201420631204.0U CN201420631204U CN204430525U CN 204430525 U CN204430525 U CN 204430525U CN 201420631204 U CN201420631204 U CN 201420631204U CN 204430525 U CN204430525 U CN 204430525U
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Abstract
The utility model provides a kind of striking detection and push current control circuit of electric arc welding equipment, sets up node TP1 place as threshold thrust force point voltage, and node TP3 place is as welding rod and workpiece short-circuit threshold value voltage.Made comparisons by the voltage of amplifier by node TP2 and TP1, TP3 point place, the voltage at TP2 place is false floating voltage under welding machine idle condition, is virtual voltage under zero load and load condition.When TP2 point voltage is lower than TP3, threshold monitor pin exports high level to the interrupt pin of single-chip microcomputer, and single-chip microcomputer thinks welding rod and workpiece short circuit, and exports actual welding voltage, realizes timely and reliable striking.During actual welding, when the voltage of TP2 lower than TP1, the square wave that single-chip microcomputer exports is given, and to obtain thrust through optocoupler and RC filtering given, is added to and exports the accurate push current of given upper realization.The utility model utilizes 8 AVR single chip Real-Time Monitoring welding output voltages and provides accurate voltage signal and makes the striking reliably of welding machine energy and provide accurate push current.
Description
Technical field
The utility model relates to a kind of SMAW striking detection and push current control circuit, belongs to electric arc welding apparatus field.
Background technology
The success or not that conventional welding rod weldering detects striking mainly relies on the electric current in monitoring welding circuit, but actual conditions are the method there is the phenomenon of signal lag, the experience of welder be exactly striking not in time with unreliable.
The push current of conventional welding rod weldering is coarse, and the uniformity of welding machine is not high, and when running into meticulous welding, welder can only be relied on to go constantly to carry out welding the performance that every platform welding machine is found out in test, and this work expends time in and energy.
Summary of the invention
The purpose of this utility model overcomes the deficiencies in the prior art, provides a kind of striking detection and push current control circuit of electric arc welding equipment, promotes SMAW striking and thrust performance.
According to the technical scheme that the utility model provides, the striking detection of described electric arc welding equipment and push current control circuit, its structure comprises: welding machine output voltage is input to the input of voltage follower U1B by voltage isolator part isolated buck, voltage follower U1B output is connected to node TP2, and node TP2 connects the inverting input of amplifier U1A and the inverting input of amplifier U2A; The in-phase input end connected node TP1 of amplifier U1A, node TP1 connect high level and through resistance R6 ground connection, the voltage of node TP1 is threshold thrust force point voltage through resistance R5; The output of amplifier U1A connects the input anode of optocoupler U1 through resistance R3, the input negative terminal of optocoupler U1 connects triode Q1 colelctor electrode, and triode Q1 base stage connects the square wave given side of single-chip microcomputer through resistance R4, triode Q1 grounded emitter; The output plus terminal of optocoupler U1 connects high level, and the output negative terminal of optocoupler U1 through electric capacity C1 ground connection, and through resistance R2 thrust output Setting signal, namely obtains push current on the output that is added to is given; The in-phase input end connected node TP3 of amplifier U2A, node TP3 connect high level and through resistance R9 ground connection, the voltage of node TP3 is welding rod and workpiece short-circuit threshold value voltage through resistance R8; The output of amplifier U2A is through resistance R7 ground connection and be connected to the interrupt pin of single-chip microcomputer as threshold monitor pin; Node TP2 also connects the AD mouth of single-chip microcomputer through resistance R10, this AD mouth is also respectively through resistance R11 and electric capacity C2 ground connection; When node TP2 voltage is lower than TP3, threshold monitor pin exports the interrupt pin of high level to single-chip microcomputer, and single-chip microcomputer judges welding rod and workpiece short circuit, and exports actual welding voltage; During actual welding, when the voltage of monitoring node TP2 voltage lower than TP1, amplifier U1A exports high level, single-chip microcomputer output duty cycle can the square wave of fine adjustment, namely optocoupler exports identical square wave, and the RC filter structure consisted of resistance R2 and electric capacity C1 obtains the thrust Setting signal of smooth out ripple.Described single-chip microcomputer specifically can adopt 8 AVR single chip.
The voltage at node TP2 place is false floating voltage under welding machine idle condition, is provided by welding machine control circuit; Be virtual voltage under zero load and load condition, provided by main circuit of the welding machine.
The utility model has the advantages that: utilize 8 AVR single chip Real-Time Monitorings welding output voltages and provide accurate voltage signal and make welding machine can striking reliably and provide accurate push current, reliably, uniformity is high for this simple circuit.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, welding machine output voltage is input to the input of voltage follower U1B by voltage isolator part isolated buck, voltage follower U1B output is connected to node TP2, and node TP2 connects the inverting input of amplifier U1A and the inverting input of amplifier U2A; The in-phase input end connected node TP1 of amplifier U1A, node TP1 connect high level and through resistance R6 ground connection, the voltage of node TP1 is threshold thrust force point voltage through resistance R5; The output of amplifier U1A connects the input anode of optocoupler U1 through resistance R3, the input negative terminal of optocoupler U1 connects triode Q1 colelctor electrode, and triode Q1 base stage connects the square wave given side of single-chip microcomputer through resistance R4, triode Q1 grounded emitter; The output plus terminal of optocoupler U1 connects high level, and the output negative terminal of optocoupler U1 through electric capacity C1 ground connection, and through resistance R2 thrust output Setting signal, namely obtains push current on the output that is added to is given; The in-phase input end connected node TP3 of amplifier U2A, node TP3 connect high level and through resistance R9 ground connection, the voltage of node TP3 is welding rod and workpiece short-circuit threshold value voltage through resistance R8; The output of amplifier U2A is through resistance R7 ground connection and be connected to the interrupt pin of single-chip microcomputer as threshold monitor pin.Node TP2 also connects the AD mouth of single-chip microcomputer through resistance R10, this AD mouth is also respectively through resistance R11 and electric capacity C2 ground connection.
Wherein, TP1 place is threshold thrust force point voltage; TP3 place is welding rod and workpiece short-circuit threshold value voltage.Voltage follower U1B is made up of amplifier.U1B and U1A is the double operational on chip LM358H.Welding machine output voltage is input to 5 pin of U1B by voltage isolator part isolated buck, node TP2 is outputted to again by voltage follower U1B, node TP2 and TP1, the voltage at TP3 point place is made comparisons use, the voltage at TP2 place is false floating voltage (welding machine output voltage is provided by control circuit, and non-main circuit provides, and IGBT does not work) under welding machine idle condition, under zero load and load condition be virtual voltage (main circuit provides, and IGBT works).
When welding rod and workpiece short circuit, we it has been generally acknowledged that now voltage should close to 0V, can by whether detecting output voltage close to the signal of 0V as short circuit, but actual conditions be this way or can cause striking not in time with unreliable, because the relation of the time difference, when circuit thinks short circuit, welding rod has been run into workpiece already in fact, for eliminating this error, we are using 40V(node TP3 by experiment) as threshold voltage, when the false zero load of circuit monitoring is less than 40V(TP2 point voltage lower than TP3) time, threshold monitor pin exports the interrupt pin of high level to AVR single chip, AVR single chip just thinks welding rod and workpiece short circuit, and export actual welding voltage, realize timely and reliable striking.
During actual welding, when the voltage of the voltage of monitoring welding rod and workpiece lower than TP1,1 pin of U1A exports high level, dutycycle that what AVR single chip exported is can the square wave of fine adjustment given, optocoupler and exportable identical square wave, the thrust that the RC filtering consisted of R2 and C1 obtains smooth out ripple is given, can realize accurate push current on the output that is added to is given.
Claims (3)
1. the striking detection of electric arc welding equipment and push current control circuit, it is characterized in that, comprise: welding machine output voltage is input to the input of voltage follower U1B by voltage isolator part isolated buck, voltage follower U1B output is connected to node TP2, and node TP2 connects the inverting input of amplifier U1A and the inverting input of amplifier U2A; The in-phase input end connected node TP1 of amplifier U1A, node TP1 connect high level and through resistance R6 ground connection, the voltage of node TP1 is threshold thrust force point voltage through resistance R5; The output of amplifier U1A connects the input anode of optocoupler U1 through resistance R3, the input negative terminal of optocoupler U1 connects triode Q1 colelctor electrode, and triode Q1 base stage connects the square wave given side of single-chip microcomputer through resistance R4, triode Q1 grounded emitter; The output plus terminal of optocoupler U1 connects high level, and the output negative terminal of optocoupler U1 through electric capacity C1 ground connection, and through resistance R2 thrust output Setting signal, namely obtains push current on the output that is added to is given; The in-phase input end connected node TP3 of amplifier U2A, node TP3 connect high level and through resistance R9 ground connection, the voltage of node TP3 is welding rod and workpiece short-circuit threshold value voltage through resistance R8; The output of amplifier U2A is through resistance R7 ground connection and be connected to the interrupt pin of single-chip microcomputer as threshold monitor pin; Node TP2 also connects the AD mouth of single-chip microcomputer through resistance R10, this AD mouth is also respectively through resistance R11 and electric capacity C2 ground connection; When node TP2 voltage is lower than node TP3, threshold monitor pin exports the interrupt pin of high level to single-chip microcomputer, and single-chip microcomputer judges welding rod and workpiece short circuit, and exports actual welding voltage.
2. the striking detection of electric arc welding equipment and push current control circuit as claimed in claim 1, it is characterized in that, the voltage at described node TP2 place is false floating voltage under welding machine idle condition, is provided by welding machine control circuit; Be virtual voltage under zero load and load condition, provided by main circuit of the welding machine.
3. the striking detection of electric arc welding equipment and push current control circuit as claimed in claim 1, it is characterized in that, described single-chip microcomputer is 8 AVR single chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420631204.0U CN204430525U (en) | 2014-10-28 | 2014-10-28 | The striking detection of electric arc welding equipment and push current control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420631204.0U CN204430525U (en) | 2014-10-28 | 2014-10-28 | The striking detection of electric arc welding equipment and push current control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204430525U true CN204430525U (en) | 2015-07-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420631204.0U Withdrawn - After Issue CN204430525U (en) | 2014-10-28 | 2014-10-28 | The striking detection of electric arc welding equipment and push current control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204430525U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104400185A (en) * | 2014-10-28 | 2015-03-11 | 无锡汉神电气有限公司 | Striking arc detection and push current control circuit of electric arc welding equipment |
| CN106112212A (en) * | 2016-07-13 | 2016-11-16 | 苏州新逸喆电子科技有限公司 | A kind of push current control module for radio welding machine |
-
2014
- 2014-10-28 CN CN201420631204.0U patent/CN204430525U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104400185A (en) * | 2014-10-28 | 2015-03-11 | 无锡汉神电气有限公司 | Striking arc detection and push current control circuit of electric arc welding equipment |
| CN104400185B (en) * | 2014-10-28 | 2016-05-04 | 无锡汉神电气有限公司 | The striking detection of electric arc welding equipment and push current control circuit |
| CN106112212A (en) * | 2016-07-13 | 2016-11-16 | 苏州新逸喆电子科技有限公司 | A kind of push current control module for radio welding machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150701 Effective date of abandoning: 20160504 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |