CN202894547U - Anti-sticking functional circuit for insulated grid bipolar transistor (IGBT) type high-frequency invert direct current (DC) electric welder - Google Patents
Anti-sticking functional circuit for insulated grid bipolar transistor (IGBT) type high-frequency invert direct current (DC) electric welder Download PDFInfo
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- CN202894547U CN202894547U CN 201220651140 CN201220651140U CN202894547U CN 202894547 U CN202894547 U CN 202894547U CN 201220651140 CN201220651140 CN 201220651140 CN 201220651140 U CN201220651140 U CN 201220651140U CN 202894547 U CN202894547 U CN 202894547U
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Abstract
The utility model discloses an anti-sticking functional circuit for an insulated grid bipolar transistor (IGBT) type high-frequency invert direct current (DC) electric welder, and relates to a circuit for an electric welder. The anti-sticking functional circuit comprises a delay circuit, a current comparison circuit, a current regulator, a PWM (pulse width modulation) control circuit, an IGBT driving circuit, a high-frequency invert DC power supply main circuit, a current detection circuit, an insulated voltage detection circuit and a voltage comparison circuit, wherein the current regulator is connected with the PWM control circuit, the PWM control circuit is connected with the IGBT driving circuit, and the IGBT driving circuit is connected with the high-frequency invert DC power supply main circuit. By the adoption of the circuit, automatic detection is carried out on arc voltage in real time during a welding process, according to the judgment, the status of the electric welder is correctly obtained, a short circuit is effectively prevented, and damage of a welding gun and a workpiece is avoided. The circuit is simple in structure and reliable in operation, the problem of anti-sticking in a novel TIG (tungsten inert gas) argon arc electric welder/MMA (manual metal arc) manual electrical welder is solved, and the loss during the welding process is effectively reduced.
Description
Technical field
The utility model relates to a kind of electric welding machine circuit, particularly the antiseized functional circuit of a kind of IGBT type high-frequency inversion dc welding machine.
Background technology
Since the reform and opening-up, the national economy rapid growth, " scientific and technical innovation, autonomous innovation " become the main flow of present domestic industry development, and China's industry is just progressively to the future development of intensive style, energy-saving and emission-reduction, low-carbon (LC).Along with industrial expansion, electric welding machine is widely used as welding jig indispensable in the industrial production.MMA welding refers to a kind of welding method, wherein is in welding rod among the electrode holder as welding electrode, and electric arc burns between welding rod and workpiece, constantly shortens along with the carrying out of welding as the welding rod of welding electrode.Electrode holder must be constantly moves to the direction of workpiece, so that the distance between electrode and the melting weld seam remains unchanged.The MMA welding almost can be used under any condition, so it is the quite general method of welding profession.TIG refers to argon arc welding, is again gas shielded arc welding, is to utilize adscititious gases as a kind of arc welding method of protective medium, and air insulated outside welding zone, is prevented the oxidation of welding zone.The argon arc welding technology is on the basis of common electrical Arc Welding Principles; utilize argon gas to the protection of metal wlding; make wlding be melted into the liquid bath that forms at welded base material by high electric current; make welded metal and wlding reach a kind of solder technology of metallurgical binding; owing in the high-temperature fusion welding, constantly serving argon gas; wlding can not be contacted with airborne oxygen, thereby prevented the oxidation of wlding.Its advantage is that electric arc and molten bath observability are good, easy to operate, does not have slag or slag seldom, need not the postwelding scarfing cinder.The IGBT direct-current inverter welding machine is a kind of novel Arc Welding Power, and its good electric property and significant energy-saving effect have obtained sufficient embodiment in various capital construction industries.At present most of what adopt is the PWM technology to the technology of the IGBT direct-current inverter welding machine of China, thereby the dutycycle of the SG3525 PWM control integration circuit adjustment IGBT power switch pipe by specialty reaches the adjusting of output current size.Plain edition TIG (argon arc)/MMA (craft) electric welding machine if mutual short circuit occurs output, will make weldment and welding rod bond together in welding process.For tig arc welding machine, the tungsten pin must be pulled down again polishing; For the MMA welding machine, then must or force separately the welding machine outage, when forcing separately, can produce greatly larger electric arc because of output current, welding gun or weldment are scrapped.The technical staff of R﹠D institution and enterprise is constantly exploring, is studying, wish to develop a kind of electric welding machine of superior performance, scrap the loss that is caused with weldment and bonding welding gun or the weldment of causing of welding rod in the reduction production process, although make some progress, in practice, still exist the technical barrier that not yet overcomes.
Summary of the invention
The purpose of this utility model is to overcome above deficiency, provide a kind of IGBT type high-frequency inversion dc welding machine antiseized functional circuit, this circuit will detect arc voltage in welding process in real time automatically, by judging the state that correctly obtains electric welding machine of processing, effectively prevent the generation of short circuit, avoid the damage of welding gun and workpiece.
The technical scheme that its technical problem that solves the utility model adopts is: contain delay circuit I, delay circuit II, delay circuit III, current comparison circuit I, current regulator, pwm control circuit, the IGBT drive circuit, high-frequency inversion dc source main circuit, the electric welding machine output electrode, current detection circuit, the isolation voltage testing circuit, voltage comparator circuit, current comparison circuit II, T/M selects signal end, the given signal end of foreign current, switch SW 1-SW4, diode D1-D5, phase inverter Y1-Y4, resistance R 1-R3, the given signal end of foreign current connects switch SW 1 successively, SW2, SW3, switch SW 3 another termination indicator lamps, indicator lamp connects current regulator, current regulator connects pwm control circuit, pwm control circuit connects the IGBT drive circuit, the IGBT drive circuit connects high-frequency inversion dc source main circuit, power supply is inputted from high-frequency inversion dc source main circuit, high-frequency inversion dc source main circuit connects the electric welding machine output electrode, electric welding machine output electrode negative pole connects current detection circuit, current detection circuit is successively by current comparison circuit I, delay circuit I is connected with switch SW 1, current detection circuit connects indicator lamp simultaneously, isolation voltage testing circuit one terminates on the circuit between high-frequency inversion dc source main circuit and the electric welding machine output electrode, one end connects voltage comparator circuit, voltage comparator circuit connects delay circuit II, delay circuit II meets phase inverter Y2, it is anodal that phase inverter Y2 meets diode D4, be parallel with resistance R 1 and diode D1 on the switch SW 1, resistance R 1 and diode D1 series connection, diode D1, be parallel with diode D2 and switch SW 4 on switch SW 2 and the switch SW 3, switch SW 4 is connected with diode D2 is anodal, current detection circuit meets current comparison circuit II simultaneously, current comparison circuit II meets phase inverter Y3, it is anodal that phase inverter Y3 meets diode D5, T/M selects signal termination phase inverter Y1, it is anodal that phase inverter Y1 meets diode D3, diode D3, D4, the D5 negative pole all is connected with switch SW 4, diode D3, D4, the D5 negative pole is all by resistance R 3 ground connection, T/M selects on the circuit between signal end and the phase inverter Y1 and is connected with wire between the switch SW 2, delay circuit II is connected with switch SW 4 with phase inverter Y4 by delay circuit III simultaneously, switch SW 4 and phase inverter Y4, be parallel with resistance R 2 on the delay circuit III, consisted of the antiseized functional circuit of a kind of IGBT type high-frequency inversion dc welding machine.
The know-why that its technical problem that solves the utility model adopts is: antiseized functional circuit is by the real-time detection to electric welding machine output voltage and output current, by electronic circuit or programming device realization comparison, time-delay and the logic of voltage and current signal are judged, regulating circuit in conjunction with prior duty cycles, correctly control the output of IGBT drive circuit, reach output current requirement corresponding under the different conditions, thereby guarantee that bonding phenomenon does not occur for weldment and welding rod.Antiseized main circuit will realize by control given value of current value, and when detecting output short-circuit, produce control signal through judging, making output current is smaller value, prevents sticking of welding gun and weldment.The normal working voltage of TIG electric welding machine is generally 10V-17V, and the normal working voltage of MMA electric welding machine is generally 15V-25V.Generally output current is controlled between the 0.5-2A, so just is easy to tungsten pin and welded part are separated, can not cause scrapping of welding gun and weldment.The current regulator set-point is combined to form under logic control signal by switch SW 1-SW4, and logic control signal is by generations such as current detection circuit and voltage detecting circuit, delay circuit, current comparison circuits.
When being chosen as manual welding pattern (T/M is high level), switch SW 4 is in all the time off state, SW2 and is in all the time conducting state, and current regulator is given by switch SW 1 and SW3 combination results.When beginning to weld, output voltage from high to low, signal In uprises, Fn through the time-delay step-down, switch SW 3 is open-minded during this.Simultaneously, when electric current was not also set up, signal A2 was high, and switch SW 1 is open-minded.The given signal of foreign current and the acting in conjunction of In signal are used for striking current given, in case after the starting the arc, A2 signal step-down, SW1 turn-offs, and the given signal of foreign current is given as current regulator by R1, D1, SW2, SW3.Behind machine initial arc, if output voltage gets up in the time at t3, In can be through time-delay t1 vanishing, and Fn can remain high level, enters normal welding process.If the output voltage of welding machine does not get up in the time at t3, In keeps high level, and Fn is high level in delay time t3, the SW3 conducting, current regulator be given as the striking current value, t3 is after the time, because voltage does not get up, expression bonds, Fn reduces to zero, given value of current is set to zero, and making output current is zero, reaches antiseized purpose.
When being chosen as argon arc welding pattern (T/M is low level), the state that switch SW 2 is in off state, SW4 all the time is subjected to phase inverter Y2, Y3 to export control.Current regulator is given by switch SW 3 and SW4 combination results.Its process analysis procedure analysis and roughly the same top.When In is high level or A3 when being high level, SW4 is in off state.Therefore, striking current is set through R2 by the In signal.If in delay time t3, the normal starting the arc of welding machine, output voltage raises, then In vanishing, Fn keeps high level, because output current is set up, A3 becomes low level, the SW3 conducting, the given electric current that can be added to of foreign current is regulated.After time, In reduces to zero through t1, and current regulator is given fully by the given signal deciding of foreign current.When bonding occured, output voltage can not rise, and In is high level, through behind the phase inverter Y2 so that SW4 disconnect, simultaneously through behind the time-delay t3, the Fn vanishing, SW3 disconnects, given value of current is zero, reaches antiseized purpose.
The beneficial effects of the utility model are: this circuit will detect arc voltage in welding process in real time automatically, process the state that correctly obtains electric welding machine by judging, effectively prevent the generation of short circuit, avoid the damage of welding gun and workpiece.This circuit structure is simple, and is reliable, solved the antiseized problem of welding of novel TIG (argon arc)/MMA (craft) electric welding machine, effectively reduces the loss of welding process.
Description of drawings
The below further describes the utility model in conjunction with the accompanying drawings and embodiments:
Fig. 1 is the antiseized functional circuit schematic diagram of IGBT type high-frequency inversion dc welding machine;
Fig. 2 is the signal analysis figure of the antiseized functional circuit current detecting of IGBT type high-frequency inversion dc welding machine and correlation function;
Fig. 3 is the signal analysis figure of antiseized functional circuit voltage detecting and correlation function when not boning;
The signal analysis figure of voltage detecting and correlation function when Fig. 4 is antiseized functional circuit generation bonding.
In the drawings, 1 delay circuit I, 2 current comparison circuit I, 3 current regulators, 4PWM control circuit, 5IGBT drive circuit, 6 high-frequency inversion dc source main circuits, 7 electric welding machine output electrodes, 8 current detection circuits, 9 isolation voltage testing circuits, 10 voltage comparator circuits, 11 delay circuit II, 12 current comparison circuit II, 13 delay circuit III, 14T/M select signal end, the given signal end of 15 foreign currents.
The specific embodiment
The given signal end 15 of foreign current connects switch SW 1 successively, SW2, SW3, switch SW 3 another termination indicator lamps, indicator lamp connects current regulator 3, current regulator 3 connects pwm control circuit 4, pwm control circuit 4 connects IGBT drive circuit 5, IGBT drive circuit 5 connects high-frequency inversion dc source main circuit 6, power supply is from 6 inputs of high-frequency inversion dc source main circuit, high-frequency inversion dc source main circuit 6 connects electric welding machine output electrode 7, electric welding machine output electrode 7 negative poles connect current detection circuit 8, current detection circuit 8 is successively by current comparison circuit I2, delay circuit I1 is connected with switch SW 1, current detection circuit 8 connects indicator lamp simultaneously, isolation voltage testing circuit 9 one terminates on the circuit between high-frequency inversion dc source main circuit 6 and the electric welding machine output electrode 7, one end connects voltage comparator circuit 10, voltage comparator circuit 10 connects delay circuit II11, delay circuit II11 meets phase inverter Y2, it is anodal that phase inverter Y2 meets diode D4, be parallel with resistance R 1 and diode D1 on the switch SW 1, resistance R 1 and diode D1 series connection, diode D1, be parallel with diode D2 and switch SW 4 on switch SW 2 and the switch SW 3, switch SW 4 is connected with diode D2 is anodal, current detection circuit 8 meets current comparison circuit II12 simultaneously, current comparison circuit II12 meets phase inverter Y3, it is anodal that phase inverter Y3 meets diode D5, T/M selects signal termination phase inverter Y1, it is anodal that phase inverter Y1 meets diode D3, diode D3, D4, the D5 negative pole all is connected with switch SW 4, diode D3, D4, the D5 negative pole is all by resistance R 3 ground connection, T/M selects on the circuit between signal end 14 and the phase inverter Y1 and is connected with wire between the switch SW 2, delay circuit II11 is connected with switch SW 4 with phase inverter Y4 by delay circuit III13 simultaneously, switch SW 4 and phase inverter Y4, be parallel with resistance R 2 on the delay circuit III13, consisted of the antiseized functional circuit of a kind of IGBT type high-frequency inversion dc welding machine.
This antiseized functional circuit is by the real-time detection to electric welding machine output voltage and output current, by electronic circuit or programming device realization comparison, time-delay and the logic of voltage and current signal are judged, regulating circuit in conjunction with prior duty cycles, correctly control the output of IGBT drive circuit 5, reach output current requirement corresponding under the different conditions, thereby guarantee that bonding phenomenon does not occur for weldment and welding rod.Antiseized main circuit will realize by control given value of current value, and when detecting output short-circuit, produce control signal through judging, making output current is smaller value, prevents sticking of welding gun and weldment.The normal working voltage of TIG electric welding machine is generally 10V-17V, and the normal working voltage of MMA electric welding machine is generally 15V-25V.Generally output current is controlled between the 0.5-2A, so just is easy to tungsten pin and welded part are separated, can not cause scrapping of welding gun and weldment.The current regulator set-point is combined to form under logic control signal by switch SW 1-SW4, and logic control signal is by generations such as current detection circuit 8 and isolation voltage testing circuit 9, delay circuit I1, delay circuit II11, delay circuit III13, current comparison circuit I2, current comparison circuit II12.
When being chosen as manual welding pattern (T/M is high level), switch SW 4 is in off state all the time, and switch SW 2 is in conducting state all the time, and current regulator 3 is given by switch SW 1 and switch SW 3 combination results.According to the signal sequence of Fig. 2-Fig. 4, when beginning to weld, output voltage from high to low, signal In uprises, Fn through the time-delay step-down, switch SW 3 is open-minded during this.Simultaneously, when electric current was not also set up, signal A2 was high, and switch SW 1 is open-minded.The given signal of foreign current and the acting in conjunction of In signal are used for striking current given, in case after the starting the arc, A2 signal step-down, SW1 turn-offs, and the given signal of foreign current is given as current regulator 3 by R1, D1, SW2, SW3.Behind machine initial arc, if output voltage gets up in the time at t3, In can be through time-delay t1 vanishing, and Fn can remain high level, enters normal welding process.Signal analysis as shown in Figure 3.If the output voltage of welding machine does not get up in the time at t3, In keeps high level, and Fn is high level in delay time t3, the SW3 conducting, current regulator 3 be given as the striking current value, t3 is after the time, because voltage does not get up, expression bonds, Fn reduces to zero, given value of current is set to zero, and making output current is zero, reaches antiseized purpose.Signal analysis as shown in Figure 4.
When being chosen as argon arc welding pattern (T/M is low level), switch SW 2 is in off state all the time, and the state of SW4 is subjected to phase inverter Y2, Y3 to export control.It is 3 given by switch SW 3 and SW4 combination results that electric current is regulated.Its process analysis procedure analysis and embodiment one are roughly the same.When In is high level or A3 when being high level, SW4 is in off state, and therefore, striking current is set through R2 by the In signal.If in delay time t3, the normal starting the arc of welding machine, output voltage raises, then In vanishing, Fn keeps high level, because output current is set up, A3 becomes low level, the SW3 conducting, the given electric current that can be added to of foreign current is regulated.After time, In reduces to zero through t1, and current regulator 3 is given fully by the given signal deciding of foreign current.When bonding occured, output voltage can not rise, and In is high level, through behind the phase inverter Y2 so that SW4 disconnect, simultaneously through behind the time-delay t3, the Fn vanishing, SW3 disconnects, given value of current is zero, reaches antiseized purpose.
Claims (1)
1.IGBT the antiseized functional circuit of type high-frequency inversion dc welding machine, contain delay circuit I, delay circuit II, delay circuit III, current comparison circuit I, current regulator, pwm control circuit, the IGBT drive circuit, high-frequency inversion dc source main circuit, the electric welding machine output electrode, current detection circuit, the isolation voltage testing circuit, voltage comparator circuit, current comparison circuit II, T/M selects signal end, the given signal end of foreign current, switch SW 1-SW4, diode D1-D5, phase inverter Y1-Y4, resistance R 1-R3, it is characterized in that: the given signal end of foreign current connects switch SW 1 successively, SW2, SW3, switch SW 3 another termination indicator lamps, indicator lamp connects current regulator, current regulator connects pwm control circuit, pwm control circuit connects the IGBT drive circuit, the IGBT drive circuit connects high-frequency inversion dc source main circuit, power supply is inputted from high-frequency inversion dc source main circuit, high-frequency inversion dc source main circuit connects the electric welding machine output electrode, electric welding machine output electrode negative pole connects current detection circuit, current detection circuit is successively by current comparison circuit I, delay circuit I is connected with switch SW 1, current detection circuit connects indicator lamp simultaneously, isolation voltage testing circuit one terminates on the circuit between high-frequency inversion dc source main circuit and the electric welding machine output electrode, one end connects voltage comparator circuit, voltage comparator circuit connects delay circuit II, delay circuit II meets phase inverter Y2, it is anodal that phase inverter Y2 meets diode D4, be parallel with resistance R 1 and diode D1 on the switch SW 1, resistance R 1 and diode D1 series connection, diode D1, be parallel with diode D2 and switch SW 4 on switch SW 2 and the switch SW 3, switch SW 4 is connected with diode D2 is anodal, current detection circuit meets current comparison circuit II simultaneously, current comparison circuit II meets phase inverter Y3, it is anodal that phase inverter Y3 meets diode D5, T/M selects signal termination phase inverter Y1, it is anodal that phase inverter Y1 meets diode D3, diode D3, D4, the D5 negative pole all is connected with switch SW 4, diode D3, D4, the D5 negative pole is all by resistance R 3 ground connection, T/M selects on the circuit between signal end and the phase inverter Y1 and is connected with wire between the switch SW 2, delay circuit II is connected with switch SW 4 with phase inverter Y4 by delay circuit III simultaneously, switch SW 4 and phase inverter Y4, be parallel with resistance R 2 on the delay circuit III, consisted of the antiseized functional circuit of IGBT type high-frequency inversion dc welding machine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220651140 CN202894547U (en) | 2012-11-18 | 2012-11-18 | Anti-sticking functional circuit for insulated grid bipolar transistor (IGBT) type high-frequency invert direct current (DC) electric welder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220651140 CN202894547U (en) | 2012-11-18 | 2012-11-18 | Anti-sticking functional circuit for insulated grid bipolar transistor (IGBT) type high-frequency invert direct current (DC) electric welder |
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| CN202894547U true CN202894547U (en) | 2013-04-24 |
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| CN 201220651140 Expired - Fee Related CN202894547U (en) | 2012-11-18 | 2012-11-18 | Anti-sticking functional circuit for insulated grid bipolar transistor (IGBT) type high-frequency invert direct current (DC) electric welder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104028876A (en) * | 2014-06-25 | 2014-09-10 | 宁波欧罗巴焊割科技有限公司 | Control circuit of inverter welding machine |
| CN107598355A (en) * | 2017-10-31 | 2018-01-19 | 天津七所高科技有限公司 | Suitable for the IGBT drive circuit of medium-frequency inverting resistance welding machine inverter |
-
2012
- 2012-11-18 CN CN 201220651140 patent/CN202894547U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104028876A (en) * | 2014-06-25 | 2014-09-10 | 宁波欧罗巴焊割科技有限公司 | Control circuit of inverter welding machine |
| CN104028876B (en) * | 2014-06-25 | 2015-10-28 | 宁波欧罗巴焊割科技有限公司 | Inverter welding machine control circuit |
| CN107598355A (en) * | 2017-10-31 | 2018-01-19 | 天津七所高科技有限公司 | Suitable for the IGBT drive circuit of medium-frequency inverting resistance welding machine inverter |
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Granted publication date: 20130424 Termination date: 20181118 |
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