CN101804497A - Method for controlling electromagnetic interference signal of electric welder - Google Patents
Method for controlling electromagnetic interference signal of electric welder Download PDFInfo
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- CN101804497A CN101804497A CN 201010149346 CN201010149346A CN101804497A CN 101804497 A CN101804497 A CN 101804497A CN 201010149346 CN201010149346 CN 201010149346 CN 201010149346 A CN201010149346 A CN 201010149346A CN 101804497 A CN101804497 A CN 101804497A
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Abstract
The invention discloses a method for controlling an electromagnetic interference signal of an electric welder, and aims to provide the method for resisting the electromagnetic interference signal with high anti-interference performance and without a shielding line for shielding. The technical scheme of the invention is that: in circuits of a welding power supply and a head controller, pulse width modulated A/D-D/A photoelectric converting circuits are adopted; an REF voltage signal for setting a potentiometer and a welding feedback voltage signal are input simultaneously into a welding head control cabinet, so that the two voltage signals are proportionally amplified to form a voltage closed-loop control loop consisting of the welding head control cabinet and the welding power supply; and the A/D converting circuit in the head control cabinet modulates an analogue signal from the voltage closed-loop control loop into a digital signal which is connected to the welding power supply via an ordinary two-core control cable, so that the D/A converting circuit on the rear part of a photoelectric coupler converts a digital modulation signal into an analogue control signal after the photoelectric coupler receives the digital modulation signal.
Description
Technical field
The invention relates to the method for control electromagnetic interference signal of electric welder.
Background technology
In the prior art, the weldingvoltage adjustment of general electric welding machine is the potentiometer of setting by on the electric welding machine panel, regulates the voltage output of the source of welding current.When the source of welding current and another controller apart from each other, such as the high-altitude on the welding main equipment, when the source of welding current reaches tens meters situation on ground, conditioning signal must pass through an end of cable as shown in Figure 3, through quite long transmission line, the control voltage of small-signal is reached again on the source of welding current of the other end of cable.Because the welding cable of the source of welding current and control line are the parallel simultaneously two parallel lines that are connected to head, big electric current output cable in the source of welding current can produce very big electromagnetic interference signal, influence the aanalogvoltage waveform on the control line, make the weldingvoltage of output produce extremely unsettled output pulsation.Be welded under the voltage condition than great fluctuation process, will inevitably cause workpiece in welding process, produce the phenomenon that weld seam width differs, have a strong impact on the consequence of welding quality.Prior art is for fear of the influence of electromagnetic interference to control signal, and common processing mode is to adopt poor effect, and the very high shielding line mode of cost prevents the interference of electromagnetic signal to it.
Summary of the invention
Task of the present invention is the problems referred to above that exist at prior art, and it is simple to propose a kind of circuit theory, strong interference immunity, and do not need with shielding line shielding, the method for the control electromagnetic interference signal of electric welder of available common twin conductor transmission of control signals.
Above-mentioned purpose of the present invention can reach by following measure.A kind of method of controlling electromagnetic interference signal of electric welder, it is characterized in that having following technical characterictic: in the circuit of the source of welding current and head controller, adopt pulse-width modulation type A/D-D/A photoelectric switching circuit, the REF voltage signal of setting potentiometer is inputed in the welding head control cabinet simultaneously with the welding feedback voltage signal, allow above-mentioned two voltage signals make ratio and amplify processing, form a voltage close loop control loop that constitutes by the welding head control cabinet and the source of welding current, again by A/D change-over circuit in the head control cabinet, to be modulated into data signal from the analog signal of voltage close loop control loop, be connected to the source of welding current through common two cores control cable, make the photoelectrical coupler that is provided with in the source of welding current after receiving digital modulation signals, D/A change-over circuit by the photoelectrical coupler rear portion converts above-mentioned digital modulation signals to analog control signal.
The present invention has following beneficial effect than prior art.
The present invention adopts pulse-width modulation type A/D-D/A photoelectricity transmission circuit, the Ref control voltage of cable potentiometer is sent in the controller, after relatively amplifying processing with the weldingvoltage feedback signal, again after the transmission by A/D conversion and common twin conductor, supply with the D/A change-over circuit control panel that has photoelectrical coupler in the source of welding current and do aanalogvoltage control, thereby avoided the electromagnetic interference of welding cable generation to control line, form the constant output voltage of a no electromagnetic interference, make the output voltage stabilization of setting be transferred to welding head reliably, and then guaranteed the uniformity of welding quality, and effect is very good.
Output voltage can be exported constant weldingvoltage and electric current reposefully when remote welding after the A/D conversion.Reliablely and stablely, finish the welding job of the high main equipment of welding requirements in high quality.This voltage control mode is specially adapted to require the welding performance height, the complex work environment that equipment is many.
Description of drawings
Fig. 1 is the source of welding current and a controller circuitry connection diagram among the present invention.
Fig. 2 is the circuit theory schematic diagram of Fig. 1.
Fig. 3 is traditional voltage adjusting method schematic diagram.
The specific embodiment
Consult Fig. 1.In the circuit of the source of welding current and controller, the control connection between the head welding control cabinet and the source of welding current is that photoelectricity is isolated.The pulse-width modulation type A/D-D/A photoelectricity transmission circuit that adopts will weld feedback signal line and be connected between head and the comparison amplifier circuit, the power source voltage feedback signal is placed on form a voltage close loop loop in the welding head controller.Twin-core control cable only connects with welding controller electrical equipment, and isolates fully with the source of welding current.Described A/D-D/A converter is that what to transmit in control line is data signal, but not the simulation model.In the circuit of the source of welding current and head controller, adopt pulse-width modulation type A/D-D/A photoelectric switching circuit, the REF voltage signal of setting potentiometer is inputed in the welding head control cabinet simultaneously with the welding feedback voltage signal, allow above-mentioned two voltage signals in proportional amplifier, make ratio and amplify processing, form a voltage close loop control loop that constitutes by the welding head control cabinet and the source of welding current, again by A/D change-over circuit in the head control cabinet, to be modulated into data signal from the analog signal of voltage close loop control loop, be connected to the source of welding current through common two cores control cable, make the photoelectrical coupler that is provided with in the source of welding current after receiving digital modulation signals, convert above-mentioned digital modulation signals to analog control signal by photoelectrical coupler.
Wherein, described voltage close loop control loop is an A/D converter that is in series by source of welding current control signal wire (A/D), by the D/A switch circuit (D/A) of band photoelectrical coupler continuous in the source of welding current.
Described pulse-width modulation type A/D-D/A photoelectricity transmission circuit comprises, one is connected to head controller A/D converter A/D and isolates change-over circuit D/A by the photoelectricity that same transmission circuit is connected on the source of welding current.
Consult Fig. 2.Be connected in the control circuit of head control cabinet, divide two-way to enter in the controller from the feedback voltage signal of the source of welding current and the Ref of setting potentiometer, one the tunnel through the capacitor C1 of parallel connected end and the electrode input end that resistance R 1 is connected in IC 2D, another road feedback voltage signal enters resistance R 12 in the controller by pressure feedback port mouth Vback, the parallel circuit of forming by resistance R 12, ground connection R13, ground capacity C3 and resistance R 14 is connected to the reverse input end of comparator IC2, and positive input ground connection.The output of comparator IC2 is by on the contact and the diode D2 and the D3 that connect, link to each other with resistance R 16, R18 and R17 in the series loop respectively, deliver to comparator IC2B by D3 and R18, and connect the positive input of amplifier IC3C in the same way by comparator IC2B output, and the earth resistance R71 that passes through its backward end in parallel on the IC3C output is connected the backward end of IC 2D with R45 parallel resistor R43, make the IC2D positive input obtain voltage reference signal REF, that the backward end input obtains is feedback voltage signal Vback.When if the voltage of setting potentiometer Ref setting has deviation with feedback voltage, the output pin of IC 12D will produce an error signal, and deliver to the positive terminal of the comparator IC2A that the IC2D output links to each other, the error signal of above-mentioned generation and the triangular waveform on its reverse input end are coexisted do the mould/number conversion of pulsewidth modulation among the IC2A, the output pulse width modulated digital signal, this data signal adds diode D1 by IC2A output contact, through earth resistance R7, parallel resistance R70 and triode Q2 in parallel, after Q3 amplifies, again by triode Q2, the resistance R 41 that the Q3 output links to each other is delivered to the twin-core control line that links to each other with the source of welding current.
Be arranged on band photoelectricity D/A change-over circuit in the source of welding current, the photoelectrical coupler IC1 that comprises the current-limiting circuit electrical connection of forming by R24 and diode D5 on the source of welding current output, and be connected in parallel on and be electrically connected the amplifying circuit that earth resistance R21 forms on resistance R 20 on triode Q1 base stage and the emitter circuit and the colelctor electrode, also comprise on the triode Q1 base stage by resistance R 22 and R23 being connected in parallel on capacitor C 20 on IC 3 forward ends, and be connected across the capacitor C21 between connection resistance R 22 and R23 contact and IC 3 outputs.
After the source of welding current receives the data signal of control line transmission, process photoelectrical coupler IC1 and resistance R 20 are sent to the base stage of triode Q1, again after the amplifying circuit of triode Q1 and resistance R 21 compositions amplifies, be transported to resistance R 22 and R23, capacitor C20 and C21 and IC 3 are done the conversion of digital to analogy, by the analog signal of IC3 output, the voltage output of the control source of welding current is supplied with the welding head welding and is used.
Through the circuit of foregoing invention, can before welding, preset all welding parameters, as weldingvoltage, welding current, speed of welding etc., the demonstration of welding parameter is digital form.
Claims (10)
1. method of controlling electromagnetic interference signal of electric welder, it is characterized in that having following technical characterictic: in the circuit of the source of welding current and head controller, adopt pulse-width modulation type A/D-D/A photoelectric switching circuit, the REF voltage signal of setting potentiometer is inputed in the welding head control cabinet simultaneously with the welding feedback voltage signal, allow above-mentioned two voltage signals make ratio and amplify processing, form a voltage close loop control loop that constitutes by the welding head control cabinet and the source of welding current, again by A/D change-over circuit in the head control cabinet, to be modulated into data signal from the analog signal of voltage close loop control loop, be connected to the source of welding current through common two cores control cable, make the photoelectrical coupler that is provided with in the source of welding current after receiving digital modulation signals, D/A change-over circuit by the photoelectrical coupler rear portion converts above-mentioned digital modulation signals to analog control signal.
2. the method for control electromagnetic interference signal of electric welder as claimed in claim 1, it is characterized in that, described voltage close loop control loop is an A/D converter that is in series by source of welding current control signal wire (A/D), make photoelectricity by the photoelectrical coupler that links to each other in the source of welding current and isolate, set the voltage close loop control loop that in the head controller, forms between potentiometer and the weldingvoltage feedback line
3. the method for control electromagnetic interference signal of electric welder as claimed in claim 1 or 2, it is characterized in that, described pulse-width modulation type A/D-D/A photoelectricity transmission circuit, comprise that one is connected to head controller A/D converter A/D and is connected the D/A circuit that the band photoelectricity on the source of welding current is isolated conversion by same transmission circuit.
4. the method for control electromagnetic interference signal of electric welder as claimed in claim 1, it is characterized in that, be connected in the controller circuitry of head control cabinet, feedback voltage conditioning signal and setting potentiometer Ref from the source of welding current divide two-way to enter in the controller, one the tunnel through the capacitor C1 of parallel connected end and the electrode input end that resistance R 1 is connected in IC 2D, another road feedback voltage signal enters resistance R 12 in the controller by pressure feedback port mouth Vback, by resistance R 12, ground connection R13, the parallel circuit that ground capacity C3 and resistance R 14 are formed is connected to the reverse input end of comparator IC2, and positive input ground connection.
5. the method for control electromagnetic interference signal of electric welder as claimed in claim 4, it is characterized in that, the output of comparator IC2 is by on the contact and the diode D2 and the D3 that connect, respectively with series loop on resistance R 16, R18 links to each other with R17, deliver to comparator IC2B by D3 and R18, and connect the positive input of amplifier IC3C in the same way by comparator IC2B output, and the earth resistance R71 that passes through its backward end in parallel on the IC3C output is connected the backward end of IC 2D with R45 parallel resistor R43, make the IC2D positive input obtain voltage reference signal REF, that the backward end input obtains is feedback voltage signal Vback.
6. as the method for claim 1 or 5 described control electromagnetic interference signal of electric welder, it is characterized in that, when setting the Ref voltage that potentiometer is set, if when deviation being arranged with feedback voltage, the output pin of IC 12D will produce an error signal, and deliver to the positive terminal of the comparator IC2A that the IC2D output links to each other, the error signal of above-mentioned generation and the triangular waveform on its reverse input end are coexisted do the mould/number conversion of pulsewidth modulation among the IC2A, the output pulse width modulated digital signal, this data signal adds diode D1 by IC2A output contact, through earth resistance R7, parallel resistance R70 and triode Q2 in parallel, after Q3 amplifies, again by triode Q2, the resistance R 41 that the Q3 output links to each other is delivered to the twin-core control line that links to each other with the source of welding current.
7. the method for control electromagnetic interference signal of electric welder as claimed in claim 6, it is characterized in that, after the source of welding current receives the data signal of control line transmission, process photoelectrical coupler IC1 and resistance R 1 are sent to the base stage of triode Q1, through the amplification of triode Q1 and resistance R 2, R3, be transported to resistance R 4 and R5 again, capacitor C20 and C21 and IC 3 are done the conversion of digital to analogy, by the IC3 output, the voltage output of the control source of welding current.
8. the method for control electromagnetic interference signal of electric welder as claimed in claim 1, it is characterized in that, described A/D-D/A photoelectricity transmission circuit, comprise the anti-phase current-limiting circuit of forming by resistance R 24 and diode D5 on the source of welding current signal input part, the photoelectrical coupler IC1 that connects, and be connected in parallel on and be electrically connected the amplifying circuit that earth resistance R21 forms on resistance R 20 on triode Q1 base stage and the emitter circuit and the colelctor electrode, also comprise on the triode Q1 base stage by resistance R 22 and R23 being connected in parallel on capacitor C 20 on IC 3 forward ends, and be connected across the capacitor C21 between connection resistance R 22 and R23 contact and IC 3 outputs.
9. the method for control electromagnetic interference signal of electric welder as claimed in claim 1 is characterized in that, the control connection between the described head welding control cabinet and the source of welding current is the mode that adopts photoelectricity to isolate.
10. the method for control electromagnetic interference signal of electric welder as claimed in claim 1 is characterized in that, described control cable is common twin core cable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010149346 CN101804497B (en) | 2010-04-19 | 2010-04-19 | Method for controlling electromagnetic interference signal of electric welder |
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| CN 201010149346 CN101804497B (en) | 2010-04-19 | 2010-04-19 | Method for controlling electromagnetic interference signal of electric welder |
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| CN101804497A true CN101804497A (en) | 2010-08-18 |
| CN101804497B CN101804497B (en) | 2012-12-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109317786A (en) * | 2018-12-14 | 2019-02-12 | 唐山松下产业机器有限公司 | Short circuiting arc welding control method |
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| JPS5835064A (en) * | 1981-08-24 | 1983-03-01 | Nippon Kokan Kk <Nkk> | Arc welding method |
| DE4125444A1 (en) * | 1991-07-31 | 1993-02-04 | Kastl Electronic Gmbh & Co Kg | Automatic welding positioning device - with analog=digital transformer connected to sensor measuring direct current from sensor |
| CN1162214A (en) * | 1996-03-12 | 1997-10-15 | 常州市船舶电器设备厂 | AC. generator and axle ac generator voltage regulator |
| CN1631599A (en) * | 2004-12-23 | 2005-06-29 | 上海交通大学 | Bi-number signal processor control system of submerged arc welding machine |
| WO2008045584A1 (en) * | 2006-10-05 | 2008-04-17 | Lincoln Global, Inc. | Multiple welding using a single power source |
| CN201295812Y (en) * | 2008-10-24 | 2009-08-26 | 广东火电工程总公司 | Automatic all-position welding inverter power supply of embedded digital control tube plate |
| CN101566844A (en) * | 2009-06-09 | 2009-10-28 | 上海威特力焊接设备制造股份有限公司 | Multi-head integrated welder management system realized by centralized control |
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2010
- 2010-04-19 CN CN 201010149346 patent/CN101804497B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5835064A (en) * | 1981-08-24 | 1983-03-01 | Nippon Kokan Kk <Nkk> | Arc welding method |
| DE4125444A1 (en) * | 1991-07-31 | 1993-02-04 | Kastl Electronic Gmbh & Co Kg | Automatic welding positioning device - with analog=digital transformer connected to sensor measuring direct current from sensor |
| CN1162214A (en) * | 1996-03-12 | 1997-10-15 | 常州市船舶电器设备厂 | AC. generator and axle ac generator voltage regulator |
| CN1631599A (en) * | 2004-12-23 | 2005-06-29 | 上海交通大学 | Bi-number signal processor control system of submerged arc welding machine |
| WO2008045584A1 (en) * | 2006-10-05 | 2008-04-17 | Lincoln Global, Inc. | Multiple welding using a single power source |
| CN201295812Y (en) * | 2008-10-24 | 2009-08-26 | 广东火电工程总公司 | Automatic all-position welding inverter power supply of embedded digital control tube plate |
| CN101566844A (en) * | 2009-06-09 | 2009-10-28 | 上海威特力焊接设备制造股份有限公司 | Multi-head integrated welder management system realized by centralized control |
Non-Patent Citations (1)
| Title |
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| 《电焊机》 20041031 李鹤歧等 单片机控制IGBT逆变埋弧焊机设计 1-5 1-3 第34卷, 第10期 2 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109317786A (en) * | 2018-12-14 | 2019-02-12 | 唐山松下产业机器有限公司 | Short circuiting arc welding control method |
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