CN108115251B - No-load judging method and circuit for arc welder - Google Patents
No-load judging method and circuit for arc welder Download PDFInfo
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- CN108115251B CN108115251B CN201711456879.0A CN201711456879A CN108115251B CN 108115251 B CN108115251 B CN 108115251B CN 201711456879 A CN201711456879 A CN 201711456879A CN 108115251 B CN108115251 B CN 108115251B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000010891 electric arc Methods 0.000 claims abstract description 55
- 238000005070 sampling Methods 0.000 claims abstract description 12
- 238000003466 welding Methods 0.000 claims description 51
- 238000001514 detection method Methods 0.000 claims description 9
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
- B23K9/1043—Power supply characterised by the electric circuit
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
The application discloses an arc welder no-load judging method, which is used for detecting the output voltage U1 and the input voltage U2 of a welder power supply of the arc welder in real time, and multiplying the current input voltage U2 by a sampling coefficient A to obtain a current pseudo no-load voltage U3; if the difference of the current pseudo-idle voltage U3 minus the current output voltage U1 is greater than a pseudo-idle threshold B, the load of the electric arc welder is judged, otherwise, the electric arc welder is judged to be idle, and the threshold B is equal to 5% to 20% of the rated idle output voltage of the electric arc welder. The application also discloses an arc welder no-load judging circuit. The application can reduce the influence of input voltage fluctuation on the judgment of whether the electric arc welder is empty or not, and improve the accuracy of judging whether the electric arc welder is empty or not.
Description
Technical Field
The present application relates to an arc welder, and more particularly, to a method and circuit for determining no-load of an arc welder.
Background
An arc welding power supply is a core part in an arc welder and is a special device for supplying electric energy to a welding arc. Because the arc is a special load, the requirements for arc welding power sources differ slightly from those of ordinary power sources, which vary depending on the characteristics of the arc desired.
The no-load voltage of the arc welder is the "stand-by" voltage of the welder prior to arc initiation. The higher the no-load voltage, the easier it is to successfully strike an arc and to ensure stability of the welding arc, especially in low current welding. However, the higher the no-load voltage of the electric arc welder, the lower the power factor of the welder will cause unnecessary electric energy loss, not only increasing the manufacturing cost of the welder, but also increasing the weight of the welder, and at the same time, the higher no-load voltage will cause a greater risk for safety of welding personnel. In order to ensure that the main loop stops working when the arc welding power supply does not weld, the heating is reduced, the reliability of the power supply is increased, the selection of no-load voltage does not influence the arcing performance, and the main loop can not be turned off under the condition of excessively high arc voltage. The national regulations: the no-load voltage of the AX arc welding generator is not more than 100V, the no-load voltage of the ZX direct current arc welding machine is not more than 90V, and the no-load voltage of the BX alternating current arc welding machine is not more than 80V.
The control modes of the arc welding power supply control system in the idle state and the load state are different, so that the judgment of the idle state and the load state is critical to the arc welding power supply control system. The existing arc welding power supply no-load judging scheme comprises the following steps:
(1) And judging the current, wherein the load state is considered to be a load state when the output current is larger than a set threshold value, and the idle state is considered to be a no-load state when the output current is smaller than the set threshold value. Through current judgment, misjudgment is easily caused by too small threshold value setting, and a small current system cannot work due to too large setting.
(2) And judging through voltage, when the output voltage is larger than the set threshold value, the load state is considered as the idle state, and when the output voltage is smaller than the set threshold value, the load state is considered as the load state. Through voltage judgment, the method has the advantages that the problem of current judgment is solved, the small current can work stably, and the influence of voltage fluctuation can be input. As shown in fig. 1, when the output voltage U1 of the arc welding power source is less than a set threshold value U4, the arc welder load is determined, otherwise, the arc welder is determined to be empty. The output voltage U1 of the arc welding power supply varies due to the instability of the input voltage U2 of the arc welding power supply, and the accuracy of determining whether the arc welder is idling is lowered due to the instability of the input voltage U2 because the threshold value U4 is a fixed value.
Disclosure of Invention
The application aims to solve the technical problems of reducing the influence of input voltage fluctuation on the judgment of whether the electric arc welder is empty or not and improving the accuracy of judging whether the electric arc welder is empty or not.
In order to solve the technical problems, the no-load judging method of the electric arc welder provided by the application comprises the following steps:
detecting the output voltage U1 and the input voltage U2 of a welding machine power supply of the electric arc welder in real time, and multiplying the current input voltage U2 by a sampling coefficient A to obtain a current pseudo-no-load voltage U3;
and secondly, if the difference value obtained by subtracting the current output voltage U1 from the current pseudo-idle voltage U3 is larger than a pseudo-idle threshold value B, judging the load of the electric arc welder, otherwise judging the electric arc welder to be idle, wherein the threshold value B is 5-20% of the rated idle output voltage of the electric arc welder.
Preferably, the sampling coefficient A is determined according to a circuit deduction combination test of a welding machine power supply.
Preferably, the pseudo-no-load threshold B is 5%, 10%, 14% or 20% of the rated no-load output voltage of the electric arc welder.
Preferably, the welding machine power supply is an alternating current arc welding power supply, a direct current arc welding power supply, an arc welding inverter or a pulse arc welding power supply.
In order to solve the technical problems, the application provides an arc welder no-load judging circuit, which comprises an output voltage detecting circuit, an input voltage detecting circuit, a calculating circuit and a judging circuit;
the output voltage detection circuit is used for detecting the output voltage U1 of a welding machine power supply of the electric arc welder in real time and outputting the output voltage U1 to the judgment circuit;
the input voltage detection circuit is used for detecting the input voltage U2 of a welding machine power supply of the electric arc welder in real time and outputting the input voltage U2 to the calculation circuit;
the computing circuit is used for multiplying the input voltage U2 detected by the input voltage detection circuit by a sampling coefficient A to obtain the current pseudo-no-load voltage U3 and outputting the current pseudo-no-load voltage U3 to the judging circuit;
the judging circuit is used for comparing the difference value obtained by subtracting the current pseudo-idle voltage U3 from the current output voltage U1 with a pseudo-idle threshold value B, if the difference value obtained by subtracting the current pseudo-idle voltage U3 from the current output voltage U1 is larger than the pseudo-idle threshold value B, outputting a state signal of the load of the electric arc welder, otherwise, outputting a state signal of the electric arc welder in an idle state, wherein the threshold value B is 5-20% of the rated idle output voltage of the electric arc welder.
According to the idle load judging method and circuit of the electric arc welder, the current false idle load voltage U3 is judged according to the difference value between the current false idle load voltage U3 and the current output voltage U1, and the current false idle load voltage U3 is linearly related to the current input voltage U2, so that when the input voltage U2 fluctuates, the current false idle load voltage U3 and the current output voltage U1 fluctuate in the same direction, the influence of the fluctuation of the input voltage on the judgment of whether the electric arc welder is idle or not is reduced, and the accuracy of judging whether the electric arc welder is idle or not is improved.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the following brief description of the drawings is given for the purpose of the present application, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without the need for inventive work for a person skilled in the art.
FIG. 1 is a flow chart of a prior art arc welding power supply no-load judging method;
FIG. 2 is a flow chart of an embodiment of an electric arc welder no-load determination method of the present application;
fig. 3 is a circuit diagram of an embodiment of an idle load judging circuit of an electric arc welder according to the present application.
Detailed Description
The following description of the embodiments of the present application will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the application are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Example 1
As shown in fig. 2, the method for judging no-load of the arc welder comprises the following steps:
detecting the output voltage U1 and the input voltage U2 of a welding machine power supply of the electric arc welder in real time, and multiplying the current input voltage U2 by a sampling coefficient A to obtain a current pseudo-no-load voltage U3;
and secondly, if the difference value obtained by subtracting the current output voltage U1 from the current pseudo-idle voltage U3 is larger than a pseudo-idle threshold value B, judging the load of the electric arc welder, otherwise judging the electric arc welder to be idle, wherein the threshold value B is 5-20% of the rated idle output voltage of the electric arc welder.
Preferably, the sampling coefficient A is determined according to a circuit deduction combination test of a welding machine power supply.
Preferably, the pseudo-no-load threshold B is 5%, 10%, 14% or 20% of the rated no-load output voltage of the electric arc welder.
Preferably, the welding machine power source can be an alternating current arc welding power source, a direct current arc welding power source, an arc welding inverter or a pulse arc welding power source, and the like.
According to the electric arc welder no-load judging method, the judgment is carried out according to the difference value between the current false no-load voltage U3 and the current output voltage U1, and the current false no-load voltage U3 is linearly related to the current input voltage U2, so that when the input voltage U2 fluctuates, the current false no-load voltage U3 and the current output voltage U1 fluctuate in the same direction, the influence of input voltage fluctuation on the judgment of whether the electric arc welder is no-load or not is reduced, the judgment can be accurately carried out under the condition of fluctuation of an input network voltage, and the accuracy of judging whether the electric arc welder is no-load or not is improved.
Example two
As shown in fig. 3, the arc welder no-load judging circuit comprises an output voltage detecting circuit, an input voltage detecting circuit, a calculating circuit and a judging circuit;
the output voltage detection circuit is used for detecting the output voltage U1 of a welding machine power supply of the electric arc welder in real time and outputting the output voltage U1 to the judgment circuit;
the input voltage detection circuit is used for detecting the input voltage U2 of a welding machine power supply of the electric arc welder in real time and outputting the input voltage U2 to the calculation circuit;
the computing circuit is used for multiplying the input voltage U2 detected by the input voltage detection circuit by a sampling coefficient A to obtain the current pseudo-no-load voltage U3 and outputting the current pseudo-no-load voltage U3 to the judging circuit;
the judging circuit is used for comparing the difference value obtained by subtracting the current pseudo-idle voltage U3 from the current output voltage U1 with a pseudo-idle threshold value B, if the difference value obtained by subtracting the current pseudo-idle voltage U3 from the current output voltage U1 is larger than the pseudo-idle threshold value B, outputting a state signal of the load of the electric arc welder, otherwise, outputting a state signal of the electric arc welder in an idle state, wherein the threshold value B is 5-20% of the rated idle output voltage of the electric arc welder.
Preferably, the sampling coefficient A is determined according to a circuit deduction combination test of a welding machine power supply.
Preferably, the pseudo-no-load threshold B is 5%, 10%, 14% or 20% of the rated no-load output voltage of the electric arc welder.
Preferably, the welding machine power source can be an alternating current arc welding power source, a direct current arc welding power source, an arc welding inverter or a pulse arc welding power source, and the like.
In the electric arc welder no-load judging circuit of the second embodiment, the current false no-load voltage U3 is judged according to the difference value between the current false no-load voltage U3 and the current output voltage U1, and the current false no-load voltage U3 is linearly related to the current input voltage U2, so that when the input voltage U2 fluctuates, the current false no-load voltage U3 and the current output voltage U1 fluctuate in the same direction, the influence of the fluctuation of the input voltage on the judgment of whether the electric arc welder is no-load is reduced, and the accuracy of judging whether the electric arc welder is no-load is improved.
The above are only preferred embodiments of the present application, and are not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. An arc welder no-load judging method is characterized by comprising the following steps:
detecting the output voltage U1 and the input voltage U2 of a welding machine power supply of the electric arc welder in real time, and multiplying the current input voltage U2 by a sampling coefficient A to obtain a current pseudo-no-load voltage U3;
and secondly, if the difference value obtained by subtracting the current output voltage U1 from the current pseudo-idle voltage U3 is larger than a pseudo-idle threshold value B, judging the load of the electric arc welder, otherwise judging the electric arc welder to be idle, wherein the threshold value B is 5-20% of the rated idle output voltage of the electric arc welder.
2. The method for determining no-load of an electric arc welder according to claim 1, wherein,
the sampling coefficient A is determined according to a circuit deduction combination test of a welding machine power supply.
3. The method for determining no-load of an electric arc welder according to claim 1, wherein,
the false idle threshold B is 5%, 10%, 14% or 20% of rated idle output voltage of the arc welder.
4. The method for determining no-load of an electric arc welder according to claim 1, wherein,
the welding machine power supply is an alternating current arc welding power supply, a direct current arc welding power supply, an arc welding inverter or a pulse arc welding power supply.
5. An arc welder no-load judging circuit is characterized by comprising an output voltage detecting circuit, an input voltage detecting circuit, a calculating circuit and a judging circuit;
the output voltage detection circuit is used for detecting the output voltage U1 of a welding machine power supply of the electric arc welder in real time and outputting the output voltage U1 to the judgment circuit;
the input voltage detection circuit is used for detecting the input voltage U2 of a welding machine power supply of the electric arc welder in real time and outputting the input voltage U2 to the calculation circuit;
the computing circuit is used for multiplying the input voltage U2 detected by the input voltage detection circuit by a sampling coefficient A to obtain the current pseudo-no-load voltage U3 and outputting the current pseudo-no-load voltage U3 to the judging circuit;
the judging circuit is used for comparing the difference value obtained by subtracting the current pseudo-idle voltage U3 from the current output voltage U1 with a pseudo-idle threshold value B, if the difference value obtained by subtracting the current pseudo-idle voltage U3 from the current output voltage U1 is larger than the pseudo-idle threshold value B, outputting a state signal of the load of the electric arc welder, otherwise, outputting a state signal of the electric arc welder in an idle state, wherein the threshold value B is 5-20% of the rated idle output voltage of the electric arc welder.
6. The electric arc welder no-load judging circuit according to claim 5, wherein,
the sampling coefficient A is determined according to a circuit deduction combination test of a welding machine power supply.
7. The electric arc welder no-load judging circuit according to claim 5, wherein,
the false idle threshold B is 5%, 10%, 14% or 20% of rated idle output voltage of the arc welder.
8. The arc welder no-load determination circuit of claim 5, wherein the welder power source is an ac arc welder power source, a dc arc welder power source, an arc welder inverter, or a pulsed arc welder power source.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711456879.0A CN108115251B (en) | 2017-12-28 | 2017-12-28 | No-load judging method and circuit for arc welder |
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| CN201711456879.0A CN108115251B (en) | 2017-12-28 | 2017-12-28 | No-load judging method and circuit for arc welder |
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| CN108115251B true CN108115251B (en) | 2023-10-03 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110625220B (en) * | 2018-06-22 | 2023-06-23 | 上海文顺电器有限公司 | Intelligent inspection and debugging device and method for electric welding machine |
| CN116754986B (en) * | 2023-08-10 | 2023-11-07 | 济宁市质量计量检验检测研究院(济宁半导体及显示产品质量监督检验中心、济宁市纤维质量监测中心) | Welding power supply calibration device with no-load voltage detection function and calibration method |
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| CN108115251A (en) | 2018-06-05 |
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Denomination of invention: Method and circuit for judging the no-load of arc welding machines Granted publication date: 20231003 Pledgee: Bank of Shanghai Co.,Ltd. Jing'an Sub branch Pledgor: SHANGHAI TAYOR WELDING MACHINE Co.,Ltd.|SHANGHAI TAYOR HEAVY INDUSTRY (Group) Co.,Ltd. Registration number: Y2023310000676 |