CN101176941A - Short-circuit protection circuit of direct-current welding machine - Google Patents
Short-circuit protection circuit of direct-current welding machine Download PDFInfo
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- CN101176941A CN101176941A CNA2007101644379A CN200710164437A CN101176941A CN 101176941 A CN101176941 A CN 101176941A CN A2007101644379 A CNA2007101644379 A CN A2007101644379A CN 200710164437 A CN200710164437 A CN 200710164437A CN 101176941 A CN101176941 A CN 101176941A
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Abstract
The invention relates to a short-circuit protection circuit for the direct current welder, which is characterized in that a group of additional checking signals are superimposed on the output current of the welder, and the logical identification method is adopted for judging short circuit for the welder output. The invention has the advantages of rapid protection speed, high reliability, strong practicability, and other advantages.
Description
Technical field
The present invention relates to a kind of electric welding machine, be specifically related to a kind of short-circuit protection circuit of dc welding machine.
Background technology
Make a general survey of the most of high-frequency inverter-type welder that occurs on the market, the many employings of internal wiring structure current limliting feedback mode control shown in Figure 1.When electric circuit inspection arrives over proof current value, adjust the PWM controller automatically, maximum output current is limited in the safe and reliable scope.Analysis theoretically, this control mode of operation are to guarantee the reliable and stable operation of Arc Welding Power.
But the result of use of existing product from the market, major part also exist, and stream time is short, the margin of power is not enough, problem such as demolition power MOS pipe easily in the poor reliability, the course of work.Certainly, reason wherein is many-sided, the error in the design is arranged or lack experience the deficiency on some understanding when also having pair high-frequency inversion technology to be applied to Arc Welding Power.
Summary of the invention
In order to overcome above-mentioned defective; the short-circuit protection circuit that the purpose of this invention is to provide dc welding machine; improvement topological structure and special short-circuit protection circuit that it is suitable for Arc Welding Power make the high-frequency inversion technology be applied to Arc Welding Power and succeed, and have greatly improved the functional reliability of product.
To achieve these goals, the present invention adopts following technical scheme:
The short-circuit protection circuit of dc welding machine, it is to utilize the stack of one group of extra detection signal and electric welding machine output current, judges the whether short circuit of output of electric welding machine again by logic identification.
Foregoing circuit is the detection signal circuit connects electric welding machine by the logic identification circuit a on-off circuit.
Short-circuit protection circuit and duty detector circuit; to former electric welding machine outlet line; refer to leading line, soldering turret, workpiece clamp; do not increase on the basis of any switch contact and extension wire; realized welding rod adhesion when the electric welding machine output short-circuit; close output current voluntarily, the automatic protection functions of automatic at once restoring current output after short circuit is got rid of.
Short-circuit protection circuit: the invention of this holding circuit is to be to detect to export whether overcurrent is not to utilize the method that directly detects output current to realize.Because Arc Welding Power itself just works in " short circuit " condition regularly.Judge whether electric welding machine is in short-circuit condition if adopt " output current Threshold detection method ", after then in a single day circuit detects overcurrent, output current is closed, electric current reduces to zero, after this circuit will judge " short trouble is got rid of " from and can restoring current output, the result causes the state of " having the hiccups " continuously.If " the overcurrent self-locking is closed " method of employing has the trouble that needs manual reset again, on Arc Welding Power, there is not practicality.When adopting the maximum output current current-limiting method to protect, also there is problems such as " short-circuit dissipations ".
The present invention utilizes one group of extra detection signal and the stack of electric welding machine output current; judge the whether short circuit of output of electric welding machine by logic identification, therefore do not have the disadvantage of aforementioned two kinds of schemes, it is fast that the present invention has protection speed; the reliability height, advantage such as practical.
Description of drawings
Fig. 1 is the circuit theory diagrams of this existing electric welding machine;
Fig. 2 is a short-circuit protection circuit block diagram of the present invention;
Fig. 3 is a kind of line map of enforcement of the present invention.
Specific embodiments
The invention will be further described below in conjunction with accompanying drawing:
With reference to shown in Figure 2, the short-circuit protection circuit of dc welding machine, it is to utilize one group of extra detection signal 1 and the stack of electric welding machine 2 output currents, judges the whether short circuit of output of electric welding machine again by logic identification circuit 3.
With reference to shown in Figure 3, during operate as normal, the B point voltage is higher than the A point voltage, circuit output low level, PWM operate as normal; When welding rod and workpiece adhesion, detection signal Vi is by the Ri shorted to earth, and the B point voltage is lower than the A point, circuit output high level, and PWM is turned off; After welding rod adhesion short circuit was got rid of, detection signal Vi again by Rx and Ry dividing potential drop, made the B point voltage be higher than A point, circuit output low level, PWM operate as normal by Ri and R0 dividing potential drop.
At last, should be pointed out that above embodiment only is the more representational example of the present invention.Obviously, technical scheme of the present invention is not limited to the foregoing description, and many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (2)
1. the short-circuit protection circuit of dc welding machine is characterized in that: be to utilize one group of extra detection signal and the stack of electric welding machine output current, judge the whether short circuit of output of electric welding machine again by logic identification.
2. the short-circuit protection circuit of dc welding machine according to claim 1 is characterized in that: the detection signal circuit connects the on-off circuit of electric welding machine by the logic identification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101644379A CN101176941A (en) | 2007-11-30 | 2007-11-30 | Short-circuit protection circuit of direct-current welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101644379A CN101176941A (en) | 2007-11-30 | 2007-11-30 | Short-circuit protection circuit of direct-current welding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101176941A true CN101176941A (en) | 2008-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101644379A Pending CN101176941A (en) | 2007-11-30 | 2007-11-30 | Short-circuit protection circuit of direct-current welding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101176941A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103223545A (en) * | 2013-05-06 | 2013-07-31 | 天津大学 | Control method for automatic flat welding device for welding rods |
| CN103616548A (en) * | 2013-11-26 | 2014-03-05 | 上海通用重工集团有限公司 | Inverter welder output current detecting circuit and detecting method based on direct current signals |
| CN106180975A (en) * | 2016-08-09 | 2016-12-07 | 上海广为焊接设备有限公司 | Gas metal-arc welder output short-circuit protection method and device |
-
2007
- 2007-11-30 CN CNA2007101644379A patent/CN101176941A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103223545A (en) * | 2013-05-06 | 2013-07-31 | 天津大学 | Control method for automatic flat welding device for welding rods |
| CN103223545B (en) * | 2013-05-06 | 2015-06-17 | 天津大学 | Control method for automatic flat welding device for welding rods |
| CN103616548A (en) * | 2013-11-26 | 2014-03-05 | 上海通用重工集团有限公司 | Inverter welder output current detecting circuit and detecting method based on direct current signals |
| CN103616548B (en) * | 2013-11-26 | 2015-12-30 | 上海通用重工集团有限公司 | A kind of output current of inverting welding machine testing circuit based on direct current signal and detection method |
| CN106180975A (en) * | 2016-08-09 | 2016-12-07 | 上海广为焊接设备有限公司 | Gas metal-arc welder output short-circuit protection method and device |
| CN106180975B (en) * | 2016-08-09 | 2018-07-17 | 上海广为焊接设备有限公司 | Gas metal-arc welder output short-circuit protection method and device |
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| PB01 | Publication | ||
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Application publication date: 20080514 |