CN109352136A - A kind of IGBT contravariant argon arc welding machine of more welding methods - Google Patents
A kind of IGBT contravariant argon arc welding machine of more welding methods Download PDFInfo
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- CN109352136A CN109352136A CN201811477038.2A CN201811477038A CN109352136A CN 109352136 A CN109352136 A CN 109352136A CN 201811477038 A CN201811477038 A CN 201811477038A CN 109352136 A CN109352136 A CN 109352136A
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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
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- 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
-
- 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
- B23K9/32—Accessories
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Generation Of Surge Voltage And Current (AREA)
- Arc Welding Control (AREA)
Abstract
The present invention relates to a kind of IGBT contravariant argon arc welding machine of more welding methods, welding machine has three kinds of argon arc welding, pulsed argon arc welding and manual metal-arc welding welding methods；In operation interface, design has many indicator lights, key, encoder, numeral method device；Display can show welding parameter, such as the electric current of starting, welding, pulse；Preceding gas and the slow liter of rear gas, electric current and ramp down time would；Pulse frequency, width or duty ratio；By arc welding gun switch mode of operation key, 2T or 4T mode may be selected；By pulse parameter key, frequency, width or the duty ratio and background current parameter of pulse may be selected；By time sequence parameter key, initial current may be selected, electric current rises or slow rise time, electric current delay drop or die-away time, receive arc current；By electric current key, peak point current when welding current or impulse welding may be selected.When selecting a certain parameter, the adjusting or setting of corresponding parameter can be carried out by encoder.
Description
Technical field
The present invention relates to a kind of IGBT contravariant argon arc welding machines of more welding methods, belong to inverter type welder technology neck
Domain.
Technical background
Currently, contravariant argon arc welding, pulsed argon arc welding and the competition in manual metal-arc welding three-way set product market are very fierce, not only
It is embodied in the advance and advantage of technology, also depends greatly on function and the side such as circuit and structure design of welding machine
Face.
On domestic and international market, the rated current of contravariant argon arc welding, pulsed argon arc welding and manual metal-arc welding three-way set is usually 200
~ 500A(cyclic duration factor 60 ~ 35%) level.Different products, control circuit schematic diagram, board structure of circuit and complete machine knot
Structure, and the design etc. of operation control interface is entirely different.Show the performance of product, reliability, manufacture craft and at
This etc., also has biggish otherness.Therefore, how under the premise of low cost, operation interface and controlling are developed
Good, high reliablity the welding machine of energy has certain technical difficulty.This is also the technical problem that the present invention needs to solve.
Summary of the invention
Welding machine of the present invention has the function of three kinds of argon arc welding, pulsed argon arc welding and manual metal-arc welding welding methods, and meets production
Product safety detection and authentication requesting.In the master board of operation interface, design has many indicator lights, key, parameter tune
Save encoder, numeral method device and a large amount of circuit components.Numeral method device such as rises for showing welding parameter
Beginning, peak value of pulse, base value, receives arc current at welding；The slow liter of preceding gas and rear gas, electric current and ramp down time would when argon arc welding；Pulse frequency
Rate, width or duty ratio.Different parameters is indicated with different " unit " indicator lights.Key includes welding method, electricity
Stream, pulse parameter, arc welding gun switch mode of operation, time sequence parameter, gas time selection key, when selection, have corresponding indicator light to refer to
Show.By welding method key, DC argon arc welding, pulsed argon arc welding and manual electric arc welding may be selected；By gas time key,
Preceding gas or rear gas may be selected；By arc welding gun switch mode of operation key, 2T or 4T mode may be selected；By pulse parameter key,
Pulse frequency, pulse width or duty ratio and pulse background current parameter may be selected；By time sequence parameter key, starting may be selected
Electric current, electric current rises or slow rise time, electric current delay drop or die-away time, receive arc current；By electric current key, welding electricity may be selected
Peak point current when stream or impulse welding.Also, when selecting a certain parameter, can be carried out by encoder corresponding parameter adjusting or
Setting.In addition, power supply and protection indicator light are additionally provided with, to carry out state instruction.
Welding machine of the present invention due to three kinds of argon arc welding, pulsed argon arc welding and manual metal-arc welding welding methods, also, has good
Operation interface, circuit control performance is good, and product reliability is high, thus welding machine has better market adaptability.Its good electricity
Road and its structure design are also advantage place of the invention, and meet high efficiency and low cost production, high reliability, manufacturing technology
Advanced important leverage.Circuit theory, circuit board and the complete machine structure design of welding machine of the present invention have the unique distinction of oneself.This
The content of application for a patent for invention protection is that the circuit for protecting this welding machine and structure design.
Welding machine of the present invention has the function of three kinds of argon arc welding, pulsed argon arc welding and manual metal-arc welding welding methods, and meets production
Product safety performance detection and authentication requesting.
The shell of welding machine of the present invention mainly includes the parts such as casing, handle, bottom plate, shell screw.
The inner components part of welding machine of the present invention, the main 800VDC 100uF capacitance component including rectifying and wave-filtering resist
3 × 1uF of 500VAC capacitor of interference, temperature sensor, filters magnet ring, rectifier or rectifier bridge, 2 IGBT moulds at middle partition
Two poles of fast recovery that block, IGBT cooling fin, fast extensive diode radiating piece, the epoxy resin board for being provided with slot, output rectify
Pipe, high frequency plate is fixed and the hall sensing of the fixed bracket of protection box, inversion main transformer, hf arc starter, detection output electric current
The components parts such as device, output filter reactor.
The components installed on the front panel of welding machine of the present invention mainly have: front casing plastic plate, positive polarity export fast quick access
Head assembly, negative polarity output rapid connector component, argon gas outlet nozzle, the arc welding gun switch socket, master board for connecting argon-arc welding gun
The parts such as (Main PCB), the knob of encoder, control panel paster.Two groups of output rapid connector components are for connecting electrode holders
Cable, workpiece clamp cable or argon-arc welding gun.In master board (Main PCB), design has many indicator lights, key, parameter tune
Save encoder, numeral method device, and a large amount of electric circuit electronics technical component.Numeral method device for showing welding parameter,
Such as starting or striking electric current, welding current, pulse peak current, pulse background current, receive arc current；Sending when argon arc welding in advance
Gas (or preceding gas) and lag are held one's breath (or rear gas) time, electric current rising or slow rise time and the slow drop of electric current or die-away time；Pulse
Frequency, pulse width or duty ratio.Different parameters is indicated with different " unit " indicator lights.For example, display is not
With electric current when, while lighting instruction with unit " A " (ampere) LED light of electric current；Display preflow (or it is preceding
Gas), lag is held one's breath (or rear gas), electric current rises or it is slow rise, the time of the slow drop of electric current or decaying when, while with the list of having time
Position " S " (second) LED light lights instruction；Show that (note: pulse background current is the hundred of pulse peak current to pulse background current
Point ratio, i.e., pulse background current is in units of percentage), pulse width when, while being accompanied by unit " % " (percentage of percentage
Several symbols) LED light lights instruction；When showing pulse frequency, while being accompanied by unit " Hz " (hertz) LED of frequency
Indicator light lights instruction.If also, the unit indicator light is to light in a flashing manner, indicates the unit of pulse frequency at this time
For " KHz " (kHz).Key includes welding method, electric current, pulse parameter, arc welding gun switch operation or control mode, timing ginseng
Number, gas time selection key.By welding method key, DC argon arc welding (DC TIG), pulsed argon arc welding may be selected
(Pulse TIG) and manual electric arc welding (MMA), when selection, have corresponding indicator light to can be lit carry out state instruction；Pass through gas
Body time button may be selected preflow (or preceding gas), or lag holds one's breath (or rear gas).There is corresponding indicator light can quilt when selection
Light carry out state instruction.Also, when preflow (or preceding gas) or lag hold one's breath (or rear gas) indicator light light when, can pass through
The encoder of setting carries out corresponding time parameter adjusting；By arc welding gun switch operation or control mode key, 2T(2 may be selected
Step) or 4T(4 step) arc welding gun switch operation mode.There is corresponding indicator light to can be lit carry out state instruction when selection；Pass through arteries and veins
Parameter key is rushed, pulse frequency, pulse width or duty ratio and pulse background current parameter may be selected.There is corresponding finger when selection
Show that lamp can be lit carry out state instruction.Also, when the indicator light of corresponding parameter is lighted, corresponding ginseng can be carried out by encoder
Several adjustings；By time sequence parameter key, when initial current, electric current rising or the slow drop of slow rise time, electric current or decaying may be selected
Between, receive arc current.There is corresponding indicator light to can be lit carry out state instruction when selection.Also, when the indicator light of corresponding parameter
When lighting, the adjusting of corresponding parameter can be carried out by encoder；When selecting manual welding (MMA) or DC argon arc welding (DC TIG),
(when pressing this key, there can be corresponding indicator light that can light by electric current key and be indicated), welding current may be selected；Select arteries and veins
When rushing argon arc welding (Pulse TIG), peak point current when impulse welding can may be selected by electric current key.After welding machine is powered, panel
On have power supply (POWER) indicator light and light carry out state instruction.In addition, welding machine is in use, protected if there is overheat
Phenomenon is protected, i.e., when the device temperature of welding machine interior is excessively high, is more than operating temperature, under the action of control circuit, on the one hand may be used
It is lit the overheating indicator lamp designed on panel, to carry out state instruction.On the other hand, welding machine can be made to stop welding or defeated
Out.In the case where welding machine does not export, the cooling effect of blower can be such that the temperature of device reduces.When being reduced to recovery action temperature
When, welding machine superheating phenomenon is eliminated.Overheating indicator lamp can automatic distinguishing.Meanwhile welding machine can restore to export automatically or weld.
The components installed on the rear panel of welding machine of the present invention mainly have: power switch, the electromagnetism for connecting argon inlet mouth
The parts such as air valve, power supply line terminal box, cooling fan and its fan fixing rack.Power supply line connection from power supply grid
To terminal box.The on-off of power switch control welding machine electric power.Cooling fan is located at the rear portion of welding machine, and cold wind is from welding machine rear portion
Air inlet carries out.A good cooling air channel is constituted using fan fixing rack, middle partition, side plate washer, welder circuit can be made
Partial some heating devices or components, such as IGBT and Heat Sink A heat sink, fast recovery diode and zero, radiator
Part is preferably cooled down.Such air duct and type of cooling design are conducive to the reliability for ensureing welder circuit work, and
Welding machine of the present invention realizes the one of the major reasons of larger current and high load water holdup.
The board design of welding machine of the present invention is six pieces.Including frequency PCB plate (HF PCB), master board (Main
PCB), pcb board (QD PCB), two pieces of baffles (XSH PCB), filter bands are driven.These circuit boards, according to different functions,
Design has different circuits.High-frequency arc strike control circuit when frequency PCB plate (HF PCB) is mainly comprising argon arc welding, purpose
It is the high-frequency and high-voltage generated using circuit, realizes the contactless striking of argon arc welding.Two pieces of baffles (XSH PCB) are installed respectively
In the fast recovery diode part of output rectification, the part such as circuit and fast recovery diode is attached, and is realized and is restored two to fast
The over-voltage of pole pipe and anti-interference protection.Filter band is connected and is installed close to output par, c, realize to the filtering of output circuit part,
Over-voltage and anti-interference protection.It drives on pcb board (QD PCB), design has the driving circuit, pwm control circuit, inversion master of IGBT
Primary circuit current detecting and protection control circuit, the generation of DC power supply and control circuit, microprocessor control in circuit
Circuit, the detection of welding machine output electric current and feedback control circuit, thermal signal detection and protection control circuit, electromagnetic gas valve control electricity
The circuit of the funtion parts such as road, arc welding gun switch anti-interference control circuit.Master board (Main PCB) (i.e. master control of operation interface
Making sheet) on, design has many indicator lights, key, parameter regulation encoder, numeral method device, and a large amount of circuit electricity
The circuit that sub- component is constituted.On the circuit board, different circuit parts carries different circuit control functions.For example, number
For code tube display for showing welding parameter, such as starting, peak value of pulse, base value, receives arc current at welding；Preceding gas when argon arc welding
With rear gas, the slow liter of electric current and ramp down time would；Pulse frequency, width or duty ratio.Different parameter, with different " unit "
Indicator light instruction.Key includes welding method, electric current, pulse parameter, arc welding gun switch mode of operation, time sequence parameter, gas time
Selection key, when selection, have corresponding indicator light to indicate.By welding method key, DC argon arc welding, pulsed argon arc may be selected
Weldering and manual electric arc welding；By gas time key, preceding gas or rear gas may be selected；It, can by arc welding gun switch mode of operation key
Select 2T or 4T mode；By pulse parameter key, pulse frequency, pulse width or duty ratio and pulse background current may be selected
Parameter；By time sequence parameter key, initial current may be selected, electric current rises or slow rise time, electric current delay drop or die-away time, receipts
Arc current；By electric current key, peak point current when welding current or impulse welding may be selected.Also, when selecting a certain parameter,
The adjusting or setting of corresponding parameter can be carried out by encoder.In addition, being additionally provided with power supply and protection indicator light, referred to carry out state
Show.From the point of view of the function of its circuit, mainly completion input rectifying filtering, inversion, output filtering, anti-interference, DC operation
The generation of power supply, pwm pulse width adjusting, IGBT pipe drive control, DC argon arc welding, pulsed argon arc welding and manual metal-arc welding welding side
The work such as control of the parameters of method, timing.Finally under the action of control circuit, DC argon arc welding, pulsed argon arc are realized
Weldering and every control of three kinds of welding methods of manual metal-arc welding require, meanwhile, meet welding machine safety performance detection and reliability etc. and wants
It asks.
The circuit anti-interference measure of welding machine of the present invention, mainly has the following aspects: 1) input filter.See attached drawing 2, inputs
Filtering is made of tri- filter capacitors of CAP0, CAP1 and CAP2 filter capacitor, varistor RV3.Mainly to from power grid
Interference signal is filtered, and mitigates or reduces the adverse effect that interference signal works to welding machine control circuit of the present invention.CAP1 and
CAP2 filter capacitor is filtered the voltage after rectification；2) filtering measures are exported.See attached drawing 2, output filter circuit is by exporting
Current filtering inductance TM2, filter capacitor C1~C4, varistor RV1~RV2, resistance R1 composition.It can inhibit current fluctuation, subtract
Burr jump signal in low current waveform.In addition, being filtered to the interference signal from output end, interference is mitigated or reduced
The adverse effect that signal works to welding machine control circuit of the present invention；3) IGBT inverse switch circuit and output rectify anti-interference arrange
It applies.See attached drawing 2, in the inverter main circuit course of work, IGBT switching device can generate spike interference letter in on-off control process
Number.These interference signals are resistance by being connected in parallel on IGBT device both ends and capacitor anti-jamming circuit to be reduced or be controlled
's.See attached drawing 2, is mainly made of capacitor C76~C79 and resistance R108.And it is connected in parallel on fast recovery diode device D1 ~ D2 two
It can be reduced in fast recovery diode switching process if resistance and capacitor (such as the R1~R4, C1~C2) anti-jamming circuit at end
Spike interference signal prevents overvoltage from damaging fast recovery diode；4) anti-interference magnet ring.For example, covering in inversion main transformer B
Magnet ring L1~L8 and high frequency plate on secondary windings output line and the anti-interference magnet ring CH(10T on driving plate connecting line or
Circle)；5) in structure design aspect, there are also the measures of electromagnetic shielding.Driving and operation main control panel plate part phase of the invention
It is surrounded when in the metal shell formed by shell, bottom plate and rear panel, front panel.Isolation strong electromagnetic, limitation electricity can be played
The effects of magnetic radiation.Furthermore on operation main control panel and drive circuit board, all design has using chip A1050 device as core
The circuit of the heart.A1050 chip is isolated CAN transponder, using the circuit of the component of it and its periphery composition, it can be achieved that driving
Being in communication with each other and contacting between dynamic control circuit and operation main control panel.Prevent micro- place of two pieces of control circuit circuit parts
The noise current signal managed on device data/address bus or other circuits passes through the ground connection for entering respective microprocessor system, and interferes
With some Sensitive Apparatuses of damage.Other than the design of other circuit functional reliabilities and Countermeasures on software anti-disturbance, above-mentioned measure
It is an important prerequisite for guaranteeing welding machine product functional reliability made of circuit of the present invention.
It, can be by adjusting a small amount of amount of parts to the welding machine of the present invention that different current classes and cyclic duration factor require
And specifications parameter, the product of different output rated current and cyclic duration factor is formed, product seriation is made.For example, changing rectification
Bridge parameter；Change the current class and heat sink size of IGBT device；The model and parameter and number of change fast recovery diode
Amount；Change inversion main transformer and export the specification and parameter etc. of filter reactor, can different size easy to form series
Product.The product of such as 200A, 315A, 400A, 500A a variety of rated current grades and specifications and models.Certainly, these change, mesh
Be that the specifications parameter of product and corresponding machine and performance indicator is made to match.In this way, the welding machine of every kind of specifications and models could be real
The cost and performance control now optimized.This just improves the market competitiveness of institute's development.
Welding machine of the present invention due to three kinds of argon arc welding, pulsed argon arc welding and manual metal-arc welding welding methods, also, has good
Operation interface, circuit control performance is good, and product reliability is high, thus welding machine has better market adaptability.Its good electricity
Road and its structure design are also advantage place of the invention, and meet the important leverage of high reliability, manufacturing technology advance.
Circuit theory, circuit board and the complete machine structure design of welding machine of the present invention have the unique distinction of oneself.Present patent application protection
Content be that the circuit for protecting this welding machine and structure design.
Detailed description of the invention
The decomposition texture schematic diagram of Fig. 1 welding machine of the present invention；
The names of the parts are as follows in Fig. 1:
| 1~2 | Handle |
| 3 | Casing |
| 4 | Screw |
| 5 | Capacitor 800VDC 100uF |
| 6 | Terminal box |
| 7 | Air switch or breaker (KG) |
| 8 | 3 × 1uF of capacitor 500VAC |
| 9 | Cooling fan (Fan1) |
| 10 | Fan fixing rack |
| 11 | Middle partition |
| 12 | It drives pcb board (QD PCB) |
| 13 | 475/630V CBB electric capacity |
| 14 | Driving transformer |
| 15 | LM7815 and cooling fin |
| 16 | LM7805 and cooling fin |
| 17 | Transformer |
| 18 | Temperature sensor (YMR) |
| 19 | Filter magnet ring |
| 20 | Rectifier or rectifier |
| 21~22 | IGBT module |
| 23 | IGBT cooling fin |
| 24 | Fast extensive diode radiating piece |
| 25 | Epoxy resin board |
| 26 | Fast recovery diode |
| 27 | Baffle (XSH PCB) |
| 28 | Side plate washer |
| 29 | Current transformer (TM3) |
| 30 | Baffle (XSH PCB) |
| 31 | Fast recovery diode |
| 32 | Frequency PCB plate (HF PCB) |
| 33 | High frequency plate is fixed and protection box |
| 34 | Main transformer fixes bracket 1 |
| 35 | Inversion main transformer |
| 36 | Main transformer fixes bracket 2 |
| 37 | Filter band |
| 38~39 | Hf arc starter fixes bracket 1 |
| 40 | Hf arc starter fixes bracket 2 |
| 41 | Master board (Main PCB) |
| 42 | The knob of encoder |
| 43 | Copper connector |
| 44 | Hall sensor (BL1) |
| 45 | Filter reactor |
| 46 | Front casing plastic plate |
| 47 | Negative polarity exports quick coupling (black) |
| 48 | Arc welding gun switch socket |
| 49 | Outlet nozzle or TIG welding gun gas interface |
| 50 | Positive polarity exports quick coupling (red) |
| 51 | Covering legs |
| 52 | Electromagnetic gas valve (DF) |
The schematic block circuit diagram of Fig. 2 welding machine of the present invention；
The schematic diagram (one) of the parts such as the driving circuit of Fig. 3 welding machine of the present invention；
The schematic diagram (two) of the parts such as the driving circuit of Fig. 4 welding machine of the present invention；
The circuit diagram of the operation panel part of Fig. 5 welding machine of the present invention.
Specific embodiment
It is to utilize a kind of structural schematic diagram of example welding machine made of the present invention shown in attached drawing 1.Subordinate list 1 is example welding machine
Structural schematic diagram in main parts size inventory.Its chief component includes:
1) casing part.It is formed including the part such as casing 3, handle 1 and 2, bottom plate, shell screw 4.
2) rear panel part.The components installed on rear panel mainly have: power switch 7, the electricity for connecting argon inlet mouth
The parts such as magnetism valve 52, power supply line terminal box 6, cooling fan 9 and its fan fixing rack 10.Electricity from power supply grid
Source line is connected to terminal box 6.The on-off of the control welding machine electric power of power switch 7.Cooling fan 9 is located at the rear portion of welding machine, cold wind
It is carried out from the air inlet at welding machine rear portion.A good cooling is constituted using fan fixing rack 10, middle partition 11, side plate washer 28
Air duct can make some heating devices or components of welder circuit part, such as IGBT and Heat Sink A heat sink, two pole of fast quick-recovery
The components such as pipe and radiator are preferably cooled down.Such air duct and type of cooling design, are conducive to ensure welder circuit
The reliability of work, and welding machine of the present invention realize the one of the major reasons of larger current and high load water holdup.
3) front-facing portion.The components installed on welding machine front panel mainly have: front casing plastic plate 46, positive polarity output
Rapid connector component 50, negative polarity output rapid connector component 47, the argon gas outlet nozzle 49 for connecting argon-arc welding gun, arc welding gun switch are inserted
The parts such as seat 48, master board (Main PCB) 41, the knob 42 of encoder, control panel paster.Two groups of output quick couplings
Component 50,47 is for connecting welding clamp cable, workpiece clamp cable or argon-arc welding gun.In master board (Main PCB) 41, design
There are many indicator lights, key, parameter regulation encoder, numeral method device, and a large amount of electric circuit electronics technical component.It is digital
Tube display for showing welding parameter, such as starting or striking electric current, welding current, pulse peak current, pulse background current,
Receive arc current；Preflow (or preceding gas) and lag when argon arc welding hold one's breath (or the rear gas) time, electric current rise or slow rise time
With the slow drop of electric current or die-away time；Pulse frequency, pulse width or duty ratio.Different parameter, with different " unit "
Indicator light is indicated.For example, when showing different electric currents, while being accompanied by unit " A " (ampere) LED light point of electric current
Bright instruction；Display preflow (or preceding gas), lag are held one's breath (or rear gas), electric current rises or it is slow rise, the slow drop of electric current or decaying
When the time, while instruction is lighted with unit " S " (second) LED light of having time；Show pulse background current (note: pulse
Background current is the percentage of pulse peak current, i.e., pulse background current is in units of percentage), pulse width when, simultaneously
Instruction is lighted with unit " % " (symbol of a few percent) LED light of percentage；When showing pulse frequency, while companion
Instruction is lighted with unit " Hz " (hertz) LED light for having frequency.If also, the unit indicator light is point in a flashing manner
It is bright, then indicate that the unit of pulse frequency is " KHz " (kHz) at this time.Key includes welding method, electric current, pulse parameter, weldering
The operation of rifle switch or control mode, time sequence parameter, gas time selection key.By welding method key, direct current argon may be selected
Arc-welding (DC TIG), pulsed argon arc welding (Pulse TIG) and manual electric arc welding (MMA), when selection, have corresponding indicator light can quilt
Light carry out state instruction；It by gas time key, may be selected preflow (or preceding gas), or lag holds one's breath (or rear gas).
There is corresponding indicator light to can be lit carry out state instruction when selection.Also, when preflow (or preceding gas) or lag hold one's breath (or
Gas afterwards) indicator light when lighting, can pass through the encoder of setting and carry out corresponding time parameter adjusting；By arc welding gun switch operation or
2T(2 step may be selected in control mode key) or 4T(4 step) arc welding gun switch operation mode.There is corresponding indicator light can quilt when selection
Light carry out state instruction；By pulse parameter key, pulse frequency, pulse width or duty ratio and pulse base value electricity may be selected
Flow parameter.There is corresponding indicator light to can be lit carry out state instruction when selection.Also, when the indicator light of corresponding parameter is lighted
When, the adjusting of corresponding parameter can be carried out by encoder；By time sequence parameter key, initial current may be selected, electric current rises or
The slow drop of slow rise time, electric current or die-away time receive arc current.There is corresponding indicator light to can be lit carry out state when selection to refer to
Show.Also, when the indicator light of corresponding parameter is lighted, the adjusting of corresponding parameter can be carried out by encoder；
When selecting manual welding (MMA) or DC argon arc welding (DC TIG), (when pressing this key, can have corresponding by electric current key
Indicator light can be lighted and be indicated), welding current may be selected；When strobe pulse argon arc welding (Pulse TIG), it can be pressed by electric current
Peak point current when impulse welding may be selected in key.After welding machine is powered, power supply (POWER) indicator light is had on panel and lights carry out shape
State instruction.In addition, welding machine is in use, if there is overheating protection phenomenon, i.e., when the device temperature of welding machine interior is excessively high,
When more than operating temperature, under the action of control circuit, on the one hand the overheating indicator lamp designed on panel can be made to be lit, with into
Row state instruction.On the other hand, welding machine can be made to stop welding or output.In the case where welding machine does not export, the cooling of blower makees
With the temperature of device can be made to reduce.When being reduced to recovery action temperature, welding machine superheating phenomenon is eliminated.Overheating indicator lamp can be automatic
Extinguish.Meanwhile welding machine can restore to export automatically or weld.
4) internal other components part.It is 800VDC 100uF capacitance component 5 including rectifying and wave-filtering, jamproof
3 × 1uF of 500VAC capacitor 8, middle partition 11, temperature sensor (YMR) 18, filtering magnet ring 19, rectifier or rectifier bridge 20,2
A IGBT module 21 and 22, IGBT cooling fin 23, fast extensive diode radiating piece 24, the epoxy resin board 25 for being provided with slot,
The fast recovery diode 26 and 31 of output rectification, high frequency plate is fixed and protection box 33, inversion main transformer 35, hf arc starter are solid
The components parts such as fixed rack, the Hall sensor (BL1) 44 of detection output electric current, output filter reactor 45.
5) control panel part.Be designed as six pieces, including frequency PCB plate (HF PCB) 32, master board (Main PCB) 41,
Drive pcb board (QD PCB) 12, baffle (XSH PCB) 27 and 30, filter band 37.These circuit boards, according to different functions,
Design has different circuits.High-frequency arc strike control circuit when frequency PCB plate (HF PCB) 32 is mainly comprising argon arc welding, mesh
Be using circuit generate high-frequency and high-voltage, realize the contactless striking of argon arc welding.Two pieces of baffles (XSH PCB) 27 and 30
It is separately mounted to the fast recovery diode part of output rectification, the part such as circuit and fast recovery diode is attached, realization pair
The over-voltage of fast recovery diode and anti-interference protection.Filter band 37 is connected and is installed close to output par, c, is realized to output circuit
Partial filtering, over-voltage and anti-interference protection.It drives on pcb board (QD PCB) 12, design has the driving circuit of IGBT, PWM control
Circuit processed, the primary circuit current detecting in inverter main circuit and protection control circuit, the generation of DC power supply and control circuit,
Microprocessor control circuit, the detection of welding machine output electric current and feedback control circuit, thermal signal detection and protection control circuit, electricity
The circuit of the funtion parts such as magnetism valve controling circuit, arc welding gun switch detection and anti-interference control circuit.Master board (Main
PCB) in (i.e. the master board of operation interface) 41, design has many indicator lights, key, parameter regulation encoder, charactron
Display, and the circuit that a large amount of electric circuit electronics technical component is constituted.On the circuit board, different circuit parts carries difference
Circuit control function.For example, numeral method device is used to show welding parameter, such as starting, welding, peak value of pulse, base value, receipts
Arc current；The slow liter of preceding gas and rear gas, electric current and ramp down time would when argon arc welding；Pulse frequency, width or duty ratio.Different ginsengs
Number is indicated with different " unit " indicator lights.Key includes welding method, electric current, pulse parameter, arc welding gun switch operation side
Formula, time sequence parameter, gas time selection key, when selection, have corresponding indicator light to indicate.By welding method key, may be selected
DC argon arc welding, pulsed argon arc welding and manual electric arc welding；By gas time key, preceding gas or rear gas may be selected；Pass through welding gun
Mode of operation key is switched, 2T or 4T mode may be selected；By pulse parameter key, may be selected pulse frequency, pulse width or
Duty ratio and pulse background current parameter；By time sequence parameter key, optional initial current, electric current rising or slow rise time,
The slow drop of electric current or die-away time receive arc current；By electric current key, peak point current when welding current or impulse welding may be selected.
Also, when selecting a certain parameter, the adjusting or setting of corresponding parameter can be carried out by encoder.In addition, be additionally provided with power supply and
Indicator light is protected, to carry out state instruction etc..
Attached drawing 2-5 is the complete machine functional block diagram of welding machine of the present invention or the circuit diagram of wiring diagram and different piece.
Components, internal components on each circuit board control section of welding machine and welding machine front and back panels etc., by some
Pilot carries out mutual circuit connection.Between each circuit board, between device or components, according to the electricity of welding machine of the present invention
Road schematic diagram relationship links together.The entire control circuit of welding machine is mainly filtered by input filter circuit, inverter main circuit, output
Wave circuit, the generation of DC power supply and control circuit, the driving circuit of IGBT, pwm control circuit, the primary in inverter main circuit
Loop current detection and protection control circuit, the microprocessor control circuit in driving plate, the detection of welding machine output electric current and anti-
Present control circuit, thermal signal detection and protection control circuit, electromagnetic gas valve control circuit, arc welding gun switch detection and antidisturbance control
Circuit, high-frequency arc strike control circuit, microprocessor control circuit on master control borad, each indicator light indicating circuit, are pressed display circuit
The circuit of the funtion parts such as key control circuit forms.From the point of view of the function of its circuit, mainly completion input rectifying filters, is inverse
Become, output filtering, anti-interference, DC supply generation, pwm pulse width adjusting, IGBT pipe drive control, direct current argon arc
Weldering, the work such as control of the parameters of pulsed argon arc welding and manual metal-arc welding welding method, timing.DC argon arc welding, arteries and veins can be met
Rush three kinds of welding method function selections of argon arc welding and manual welding and the adjusting, state instruction and output of their corresponding parameters
Control.Finally under the action of control circuit, realize DC argon arc welding, three kinds of welding methods of pulsed argon arc welding and manual metal-arc welding it is each
Item control requires, meanwhile, meet welding machine safety performance detection and reliability requirements.Relevant functional circuit is carried out below
Some explanations:
See attached drawing 2, inverter main circuit is by power switch KG, input rectifying bridge BW1, CAP1 and CAP2 electrolytic capacitor (100 μ F/
800V etc.) filter circuit, IGBT1 ~ IGBT4 pipe, B inversion main transformer, D1 ~ D2 fast recovery diode, output filter circuit
Deng composition bridge inverter main circuit.Switch KG is the power supply switch on welding machine rear panel, and power switch KG controls welding machine electricity
The switching in source.Rectifier bridge BW1 is transformed to direct current for three-phase alternating current is inputted.CAP1, CAP2 electrolytic capacitor (100 μ F/800V etc.) rise
Three-phase input rectification post filtering effect.Filtered DC voltage is+540V.The direct current is supplied by IGBT1 ~ IGBT4
The full bridge inverter of the compositions such as pipe, B inversion main transformer and D1 ~ D2 fast recovery diode, output filter reactance.Pass through control
IGBT switch processed, realizes inversion transformation.Its function is main are as follows: high voltage direct current is converted to intermediate frequency (tens KHz) alternating current.B is inverse
Become the transformation that transformer realizes voltage step-down and High-current output.It later, is then that inversion is become by D1 ~ D2 fast recovery diode
The medium frequency alternating current of depressor output is transformed to direct current.It is unstable since its transformed current waveform is pulsation, it is unfavorable for
Therefore the stabilization of welding process is filtered using current filter reactor.In this way, the current waveform of output will become steady
It is fixed.It help to obtain the weld seam of high quality.Certainly, in output par, c, it is also devised with voltage filtering circuit, to carry out voltage filter
Wave ensures the interference free performance and reliability of welding machine work.Finally by OUT(+) positive polarity and OUT(-) negative polarity output is defeated
Welding current and voltage out.
See attached drawing 2, output filter circuit is by output current filtering inductance TM2, filter capacitor C1~C4, varistor RV1
~RV2, resistance R1 composition.It can inhibit current fluctuation, reduce the burr jump signal in current waveform.In addition, to from output
The interference signal at end is filtered, and reduces the adverse effect that interference signal works to welding machine control circuit of the present invention.
See attached drawing 3,4, the generation of DC power supply and control circuit by exported with multichannel AC voltage power transformer,
D18~D22 diode, D23 ~ D26, D29~D31, D34, U3(7805), U4(7815), U13(7805), U14 and U12
(7915) devices such as integrated regulator and resistance, capacitor around them form.Main function be generation+5V ,+15V ,+
3.3V, -15V direct current power source voltage supply the live line works such as corresponding control circuit.It is former for the work of power circuit part
Reason, it is relatively simple.Above section has also only carried out brief description.If necessary to understand the detailed work of this circuit part
Make situation, is related to some knowledge of regulated power supply.Reader can inquire relevant voltage regulator circuit books or data is made further
Understand.Here it is no longer described in detail.
See attached drawing 3,4, output characteristics pwm control circuit is by U17 pwm pulse width modulated chip, U18 operational amplifier
Many resistance, capacitor and the diode D43 device of (first operational amplifier in the U18 chip) and these device peripheries
Part composition.The 11(AOUT of U17 pwm pulse width modulated chip) foot and 14(BOUT) foot is output pwm pulse signal.U17 arteries and veins
The control signal for rushing the output of width modulated (PWM) chip is two groups of square-wave pulse signals.The signal is that have certain working frequency.
Two groups of square-wave pulse signals have a regular time poor in time, and dead time is also referred to as in profession.It is to ensure IGBT two
One of the important parameter that group switch works alternatively.The time is the peripheral components (R80 at the end RT by U17 chip；The end CT
C71) parameter setting and determination.As to how determining, need to check the data or explanation used in connection with of U17 chip, here not
It repeats.It should be understood that pwm pulse bandwidth modulation signals are to determine welding machine inverter main circuit output voltage and size of current
Signal.And pwm pulse bandwidth modulation signals are then by the current regulation Setting signal Ug(of welding machine by the electric current in different welding stages
Setting signal determines.For example, initial current is determined by initial current is given；Pulse current is determined by pulse current is given) and
Current negative feedback signal Ufi(different welding stages, the current feedback signal size detected be not also identical) it determines.Difference weldering
PWM output (output for also determining welding machine) the control signal for connecing the stage, passes through the microprocessor control circuit in attached drawing 5
The output of the port PA4, is connected to the PA4 signal terminal of output characteristics pwm control circuit part.U17 pulse width modulates (PWM) core
Piece has shutdown control terminal, i.e. 16 feet (SHUTD) of U17.
See attached drawing 2-4, the driving circuit of IGBT is by TR2 driving transformer, Q9 ~ Q12 metal-oxide-semiconductor field effect transistor, D35 ~ D42 bis-
The compositions such as the resistance, capacitor of pole pipe and their peripheries.Four IGBT, the driving circuit of IGBT have four road output control circuits.
This four roads circuit, each part are completely the same on circuit structure.Four road PWM output drivings control signal, pass through respectively
Plug CN14 and CN15 are connected to the drive control pole of corresponding IGBT.The control signal of the driving circuit input of IGBT is from defeated
Out in characteristic pwm control circuit U17 pwm pulse width modulated chip 11(AOUT) foot and 14(BOUT) and foot output pulse
Control signal.Since the signal driving power of U17 chip output is small, therefore need to amplify by driving power circuit, then lead to
The driving circuit for crossing TR2 driving transformer and its periphery goes to control the working condition of four IGBT.There is the control of PWM output driving
In the case where signal, IGBT1~IGBT4 in inverter main circuit can be made to be controlled according to the switching rule of setting, to make
Inverter main circuit completes inversion conversion and control.
See attached drawing 2-4, the primary circuit current detecting in inverter main circuit and protection control circuit by current detecting ring or
TM3 current transformer, D44 ~ D47, triode Q13 and some resistance of their peripheries and capacitor composition.Pass through current detecting
Ring or TM3 current transformer can detect the primary circuit current signal in inverter main circuit.The signal passes through D44 ~ D47 diode
The rectification circuit of composition is transformed to direct current signal.By late-class circuit, signal is controlled as overcurrent protection, is connected to U17 PWM
Pulse width modulates 16 feet (i.e. the shutdown sub- SHUTD of control signal end) of chip.When there is shutdown control signal, for example, occurring
When overcurrent or superheating phenomenon, the pwm signal output of U17 chip by the shutdown control terminal of the chip, can be closed.At this point, welding machine
Due to there is no pwm signal output, the IGBT switch of four control inversions will be in close state, and stop reversals, weldering
Machine does not also just export.
See that attached drawing 2-4, the detection of welding machine output electric current and feedback control circuit are put by Hall current sensor BL1, operation
Big device U16 and some resistance and capacitor composition of their peripheries.Detected output current signal is by welding machine output electricity
After the detection of stream and feedback control circuit transformation, then microprocessor control in attached drawing 5 is connected to by the output end PA3 of the circuit
The port PA3 of circuit is participated in as current negative feedback signal Ufi, and together with (the different welding stages) given value of current signal
The negative-feedback operation control of welding machine output electric current.And negative-feedback operation control as a result, the microprocessor in attached drawing 5 will be delivered to
The port PA4 of control circuit, that is, the PA4 signal end of output characteristics pwm control circuit part.The size of the signal determines
The signal of welding machine inverter main circuit output voltage and size of current.As previously described, the pwm pulse width modulated of PA4 is defeated
Out control signal by welding machine current regulation Setting signal Ug(by the different welding stages given value of current signal deciding.For example, rising
Beginning electric current is determined by initial current is given；Pulse current is determined by pulse current is given) and current negative feedback signal Ufi(is not
Same welding stage, the current feedback signal size detected be not also identical) it codetermines.Setting signal changes, welding machine
Output electric current will change correspondingly.The different welding stages applies different given current signals, also achieves that different phase electricity
Stream, such as initial current, welding current, pulse peak current, pulse background current, the control for receiving arc current parameter.
See attached drawing 3,4, electromagnetic gas valve DF control circuit is by electromagnetic gas valve DF or Y1, optocoupler U8, bidirectional thyristor or controllable
Silicon Q3, protective tube RT3, diode D9~D12, TIG arc welding gun switch SW1 detection and anti-interference control circuit, microprocessor control
The composition such as circuit.SW1 is TIG argon arc welding gun switch, the arc welding gun switch socket being connected to below welding machine front panel by plug.
Welding machine air supply system is connected, and welding machine is powered.When selecting manual electric arc welding, TIG welding gun is not used, control circuit will not make
Electromagnetic gas valve DF movement.When selecting DC argon arc welding (DC TIG) or pulsed argon arc welding (Pulse TIG) is welded, welded using TIG
Rifle.If arc welding gun switch SW1 is closed, detected and anti-interference control circuit, can be made in the detection circuit by arc welding gun switch SW1
Lumination of light emitting diode in optocoupler U5, then, the triode ON in optocoupler U5 makes PB14 be in high level.In attached drawing 3,4
Microprocessor control circuit under the action of controlling program by detection the port PB14 level signal height, that is, may know that weldering
Whether rifle switch SW1 presses.Arc welding gun switch is not pressed, and PB14 is low level；When pressing arc welding gun switch, PB14 is high electricity
It is flat.When rifle switch SW1 is closed, and PB14 is high level, microprocessor control circuit in attached drawing 3,4, in the work of control program
Under, the port PA9 can be made to export high level.Then, the lumination of light emitting diode in optocoupler U8, the bidirectional light controlled crystalline substance in optocoupler U8
Bidirectional thyristor or silicon-controlled Q3 is connected in brake tube or controlled silicon conducting.In this way, 29VAC voltage is whole by diode D9~D12
After stream, the DC voltage of acquisition can be such that electromagnetic gas valve DF acts.Then, by air supply system, protective gas can be transported to weldering
The welding section of rifle is protected, and the weld metal of welding region will not oxidation by air.In control sequential, arc welding gun switch is pressed
Protection of supplying gas can be realized in SW1.Also, at the time of at the time of starting to supply gas prior to high-frequency arc strike.When release arc welding gun switch, and
And be when preparing to terminate welding process, microprocessor control circuit will do it the delays time to control of electromagnetic gas valve DF, and final realize is protected
The lag of shield gas is held one's breath control.And the time that preflow and lag are held one's breath, it is according to two time parameters set by user
Come what is determined.These time parameters are once input in microprocessor control circuit, can be saved, and are taken until by new parameter
Generation.
See attached drawing 3,4, high-frequency arc strike control circuit (also has output electric current by T1 high voltage package, TM2 striking (boosting) transformer
The effect of filter inductance), spark discharger FD, capacitor C4~C6, optocoupler U6, bidirectional thyristor or silicon-controlled Q3, protective tube
RT1, magnet ring CH(10T or circle), diode V1~V4, thyristor or silicon-controlled V6, bidirectional trigger diode V5, TIG welding gun open
Close the compositions such as some devices of SW1 detection and anti-interference control circuit, microprocessor control circuit and their peripheries.OUT
(+) and OUT(-) be welding machine positive and negative output end.The high-frequency high-voltage signal of high-frequency arc strike passes through TM2 striking (boosting) transformer
It is coupled in the output negative pole circuit of inverter main circuit.Welding machine air supply system is connected, and welding machine is powered.When selection is electric by hand
When arc-welding, TIG welding gun is not used, control circuit will not make high-frequency arc ignition circuit work.When selection DC argon arc welding (DC TIG)
Or when pulsed argon arc welding (Pulse TIG) weldering, use TIG welding gun.If arc welding gun switch SW1 is closed, examined by arc welding gun switch SW1
Survey and anti-interference control circuit, can make the lumination of light emitting diode in the optocoupler U5 in the detection circuit, then, in optocoupler U5
Triode ON makes PB14 be in high level.Microprocessor control circuit in attached drawing 3,4 passes through under the action of controlling program
The level signal height for detecting the port PB14, that is, may know that whether arc welding gun switch SW1 presses.Arc welding gun switch is not pressed,
PB14 is low level；When pressing arc welding gun switch, PB14 is high level.When rifle switch SW1 is closed, and PB14 is high level, welding machine
Floating voltage can be generated.Meanwhile the microprocessor control circuit in attached drawing 3,4 can make the end PB15 under the action of controlling program
Mouth output high level.Then, the lumination of light emitting diode in optocoupler U6, bidirectional light controlled thyristor in optocoupler U6 or silicon-controlled leads
It is logical, make bidirectional thyristor or silicon-controlled Q3 conducting in high-frequency arc ignition circuit.In this way, 110VAC voltage passes through diode V1~V4
After rectification, the DC voltage of acquisition can be such that V5 is connected.Then, by control thyristor or silicon-controlled V6, then pass through T1 high voltage package
Boosting, the voltage at the both ends capacitor C5 and C6 can be made to increase.When voltage is increased to can be between disruptive spark discharger FD
(the boost again) armature winding of transformer of air gap, and when forming electric discharge, capacitor C5 and C6 and TM2 striking constitutes oscillating circuit,
Coupling and again boosting of the Resonant High Voltage high-frequency signal of generation by TM2 striking transformer, are introduced into inverter main circuit
Secondary loop or welding circuit.If the distance between the tungsten needle in welding gun and workpiece are appropriate at this time, and have Ar(argon gas)
Protective gas is flowed out from welding gun, then the high-frequency arc strike of argon arc welding can be realized, i.e., the air gap between tungsten needle and workpiece is by high frequency
The breakdown of high-voltage oscillation signal, finally ignite electric arc, can be carried out normal argon arc welding operation later.After striking success, welding machine
Output voltage reduce rapidly (this is also in that the voltage of argon arc is reason minimum in all welding arcs), usually only ten
A few volt left and right.It is at half than arc voltage (general 25V or so) of manual welding.In welding process, high-frequency arc strike control circuit
It can stop generating high-frequency and high-voltage striking oscillator signal.Unless can just repeat above-mentioned control process after welding arc current interruption.In front
The control section of supplying gas, once illustrated, in control sequential, presses arc welding gun switch SW1, protection of supplying gas can be realized.
Also, at the time of at the time of starting to supply gas prior to high-frequency and high-voltage striking.This is also to guarantee to realize to be sent in the striking moment in advance
The premise of gas control.
See attached drawing 1 and attached drawing 3,4, thermal signal detection and protection control circuit are by thermistor YMR, operational amplifier U16
Many resistance, capacitor, voltage-stabiliser tube ZD6 and the diode of (in first operational amplifier) and its periphery, overheat indication LED lamp
The devices such as (YELLOW or yellow), microprocessor control circuit and circuit part composition.Overheating protection indication LED lamp (YELLOW
Or yellow) be welded on operation main control panel.When thermistor YMR is installed, its temperature detection face is allowed to be close to dissipating for IGBT
Hot device surface, the place for being conducive to transition temperature are installed, convenient for preferably detecting the temperature of radiator, it is ensured that IGBT module
Reliably working.
About overheating protection control process, it is illustrated below.See attached drawing 1 and attached drawing 3,4, during welding machine output,
(it is close to the radiator peace of IGBT when superheating phenomenon occurs for the radiator of IGBT, or when heat is detected and protected in control circuit
Dress) thermistor YMR detect IGBT radiator overheat when, lead to overheating detection and protect control circuit in U16 operation
Amplifier status overturning, can be such that the level state of the port PA2 changes.Microprocessor control system circuit, by the electricity for detecting PA2
Flat height, can know whether generation superheating phenomenon.If detecting generation superheating phenomenon, overheating protection indication LED can be made
(YELLOW or yellow) lamp is lighted, and superheating phenomenon occurs in instruction welding machine.Meanwhile the pulse output of U17 PWM chip can be closed,
Welding machine is set to stop output electric current.Under the action of cooling blower, when superheating phenomenon is eliminated, control circuit can just make U17 PWM
Chip continues to output pwm pulse control signal.Overheating indicator lamp (yellow) extinguishes simultaneously.Which achieves welding machine overheating protections.
Attached drawing 5 is the circuit diagram of the operation panel part of welding machine.See that attached drawing 5, KEY1 are DC argon arc welding (DC
TIG), the selection key of pulsed argon arc welding (Pulse TIG) and manual electric arc welding (MMA), that is, welding method selection key；
KEY2 is the selection key of pulse parameter (Pulse Parameters), i.e. pulse frequency (Pulse Frequency), pulse is wide
The selection key of degree or duty ratio (Pulse Width), pulse background current (Pulse background current)；KEY3
It is the selection key of time sequence parameter (Sequence or Timing Parameters), i.e. initial current (Start
Current), electric current rising or slow rise time (Current rise time), electric current ramp down time would (Current slow down
Time), the selection key of arc current (Crater Current) is received；KEY4 is 2T, 4T arc welding gun switch mode of operation selection key；
KEY5 is preflow or preceding gas time (Pre-flow time of gas), lag hold one's breath or the rear gas time (Post-flow
Time of gas) parameter selection key；Welding current or arteries and veins when KEY7 is manual welding (MMA), DC argon arc welding (DC TIG)
Rush peak point current (Pulse peak Current) selection key when argon arc welding (Pulse TIG).U7 microprocessor control system
System by scan or detection key, that is, may know that key user has selected, also just determine or specify light front or under
The corresponding indicator light just referred to shows related data, carries out corresponding control etc..Certainly, these work are all according to setting
Fixed software control procedure carries out operation control.
See that attached drawing 5, LED8 are unit " Hz " (hertz) indicator lights of pulse frequency (Pulse Frequency).If should
Lamp flashing, then unit is " KHz " (kHz)；LED7 is that the time, (such as preflow time, lag held one's breath time, the slow liter of electric current
Time, electric current ramp down time would) unit " S " (second) indicator light；LED6 is percentage (such as pulse duty factor, pulse background current
(it indicated with the percentage of peak point current, therefore unit is percentage)) unit " % " indicator light；LED5 is electric current (as originated
Electric current, welding current, peak point current, receive arc current) unit " A " (ampere) indicator light；LED21 is overheat, overcurrent protection
(OH/OC) indicator light；LED20 is the indicator light of power supply (POWER)；LED13 is the finger of initial current (Start current)
Show lamp；LED10 is the indicator light of pulse frequency (Pulse Frequency)；LED2 is DC argon arc welding (DC TIG or TIG)
Indicator light；LED3 is the indicator light of pulsed argon arc welding (Pulse TIG)；LED11 is pulse width or duty ratio (Pulse
Width indicator light)；LED4 is the indicator light of manual welding (MMA)；LED15 is electric current ramp down time would (Current slow
Down time) indicator light；LED12 is the indicator light of pulse background current (Pulse background current)；
LED23 is that lag is held one's breath or the indicator light of rear gas time (Post-flow time of gas)；LED22 is preflow or preceding
The indicator light of gas time (Pre-flow time of gas)；When LED19 is manual welding (MMA), DC argon arc welding (DC TIG)
Welding current or pulsed argon arc welding (Pulse TIG) when peak point current (Pulse peak Current) indicator light；
LED18 is the indicator light of 4T arc welding gun switch mode of operation；LED17 is the indicator light of 2T arc welding gun switch mode of operation；LED16 is to receive
The indicator light of arc current (Crater Current).
See attached drawing 5, LED8, LED7, LED6, LED5, LED21, LED20 and LED13 be by chip U3 drive control they
It lights, and chip U3 is then controlled by U7 microprocessor system, i.e., by PB14, PB15, PA2 and SQH1 terminal signals of the system
Level is controlled；LED10, LED2, LED3, LED11, LED4, LED15 and LED14 are by their points of chip U4 drive control
Bright, and chip U4 is then controlled by U7 microprocessor system, i.e., by PA1, PA2, SQH2 and SQH1 terminal signals electricity of the system
It is flat to be controlled；Similarly, LED12, LED23, LED22, LED19, LED18, LED17 and LED16 are to be driven to control by chip U5
Make what they were lighted, and chip U5 is then controlled by U7 microprocessor system, i.e., by PA1, PA2, SQH2 terminal signals of the system
Level is controlled.Selection of the microprocessor control system of welding machine according to operator, the bright relevant indicator light in corresponding location, into
The instruction of row parameter and its unit.Compare intuitively, also greatly facilitating operator is selected and using operation.
The upper right side BMQ of attached drawing 5 is encoder, for adjusting or setting welding parameter, the data adjusted by PA0~
PA1 is input to the microprocessor control system of U7.SMG1 is numeral method device, using it as core, in addition the resistance of periphery, three
The display circuit of pole pipe composition welding machine.For showing the parameters value of welding machine.The indicator light point of additional aforementioned parameter
Bright cooperation makes operator or user be readily appreciated that the supplemental characteristic of setting or display is.The data that display circuit is shown
It is controlled by U7 microprocessor system, is controlled by PB3~PB7 of the system, PA8~PA10, D1~D3 signal terminal.
The control process of welding machine argon arc welding of the present invention, pulsed argon arc welding and manual electric arc welding output characteristics is summarized as follows:
After the switch of welding machine rear panel closes connection power supply, above-mentioned each control panel live line work of welding machine interior.Front panel
On power supply instruction LED light etc. light, indicate welding machine live line work.
Manual electric arc welding is selected when passing through the welding method selection key on welding machine front panel, and sets each stage
Welding parameter after (note: when manual welding, the parameter that can set is not to be as DC argon arc welding and pulsed argon arc welding are so much
Fewer), under the action of control circuit, the U17 pwm pulse Width Control circuit of welder circuit generates a duty ratio
Biggish pulse signal makes the drive circuit works of IGBT, and two groups of IGBT is made to be in alternating conductive state, finally makes the main electricity of inversion
Road output no-load voltage.When operator regulates the Setting signal Ug of welding current on front panel, and is welded, pass through
The detection of BL1 current Hall sensor and translation circuit, can get current negative feedback signal Ufi.Current negative feedback signal Ufi,
It is compared with welding current Setting signal Ug.Difference signal after comparing carries out PI(ratio by microprocessor control circuit
Example and integral) adjust control.The pulse width or duty ratio output of its result exported control U17 PWM chip.Pass through again
The driving circuit of IGBT, controls the make-and-break time of IGBT in inverter main circuit, final to determine the big of welding machine output electric current and voltage
It is small, realize accurately controlling for output current parameters.And the dropping characteristic for dragging the output characteristics constant current band of welding machine outside.Further
Ground is said, when welding current Setting signal Ug is constant, as the negative-feedback Ufi current signal that welder circuit detects increases, and
And after reaching given setting value, welding current gives Ug signal and the difference of Ufi current feedback control signal can be with electric current
Increase and reduces, after PI operation control, make welding machine output PWM chip pulse width or duty ratio reduction, welding machine it is defeated
Voltage reduces out.This process, that is, the control of so-called Current cut-off negative feedback, i.e., only when electric current reaches welding current electricity
The feedback control just to work after the setting value of position device.Hereafter, the increase small with electric current, voltage reduces can be very much.Work as weldering
When machine output voltage drops to 16V or less, with the reduction of voltage, control circuit can make U17 PWM chip pulse width or
Duty ratio increases, and increases welding current according to the parameter of setting, ultimately forms the dropping characteristic dragged outside constant current band, that is, low
Push current control when voltage.When welding current Setting signal variation, Current cut-off negative feedback setting value is different, but other
Control process be similar.In this way, between the minimum and maximum electric current of encoder settings, so that it may obtain special without several declines
Linearity curve.Such control, and meet the basic demand of manual arc welding.
DC argon arc welding or pulsed argon arc postwelding are selected when passing through the welding method key switch on welding machine front panel, if
The necessary devices such as welding gun needed for connecting argon arc welding, protective gas system, and the welding parameter in each stage is set, with
And after selection " 2T " or " 4T " mode of operation, welding operation can be started.So-called " 2T " arc welding gun switch mode of operation, that is, it is short
Weldering or two step modes, refer to and press arc welding gun switch, start to be welded.Arc welding gun switch is unclamped, then terminates welding operation.It is so-called
" 4T " arc welding gun switch mode of operation, that is, long weldering or four step modes, refer to and press arc welding gun switch, start to be welded.It unclamps
Arc welding gun switch continues to keep welded condition.Arc welding gun switch is pressed again, then is prepared to enter into and receives arc control.Arc welding gun switch is unclamped, then
Terminate welding operation.Different modes, the timing of control process are different.Welding machine operator can according to welding need and
Personal habits use above two model selection.
In the following, carrying out the explanation of DC argon arc welding control process with " 2T " arc welding gun switch mode of operation: firstly, making welding gun tungsten
Appropriately distance, usually several millimeters are kept between needle and workpiece.After pressing arc welding gun switch SW1, in the effect of control circuit
Under, electromagnetic gas valve DF movement, first welding section conveys protective gas, realizes preflow control.Time is by the preflow that sets
Time determine.Meanwhile the U17 pwm pulse Width Control circuit of welding machine interior generates the biggish pulse letter of a duty ratio
Number, make the drive circuit works of IGBT, two groups of IGBT is made to be in alternating conductive state, finally makes inverter main circuit output no-load electric
Pressure.Later, control circuit can issue instruction, make the work of high-frequency arc strike control circuit, realize that high-frequency and high-voltage (contactless) draws
Arc.Then, welding arc is ignited.The electric current in striking stage is determined by the setting or Setting signal of initial current.It completes
After the control of the time in striking or initial current stage, the output current control of welding machine can enter electric current and rise or delay liter control rank
Section.The control in the stage is codetermined by initial current, electric current slow rise time, the parameter setting of welding current.It is slow to complete electric current
After the control for rising time phase, control can be according to the sequence of timing, into welding stage control.Welding the stage, welding machine it is defeated
Welding current Setting signal Ug is determined on the front panel that electric current is regulated by operator out.During welding, passed by current Hall
Sensor BL1 detection and circuit transformations obtain current negative feedback signal Ufi.Current negative feedback signal Ufi can give with welding current
Determine signal Ug to be compared.Difference signal after comparing carries out PI(ratio and integral by control circuit) adjust control.Its is defeated
The pulse width or duty ratio output of result control U17 PWM chip out.By the driving circuit of IGBT, the main electricity of inversion is controlled
The make-and-break time of IGBT in road, the final size for determining welding machine output electric current and voltage, realizes accurately controlling for welding current.And
Make the dropping characteristic dragged outside the output characteristics constant current band of welding machine.Further say, when welding current Setting signal Ug is constant,
The negative-feedback Ufi current signal detected with welder circuit increases, also, after reaching given setting value, welding current is given
The difference for determining Ug signal and Ufi current feedback control signal can increase with electric current and be reduced, and after controlling by PI, keep welding machine defeated
The pulse width of PWM chip or duty ratio reduce out, and the output voltage of welding machine reduces.This process, that is, so-called electric current
End negative feedback control.When welding current Setting signal variation, Current cut-off negative feedback setting value is different, but other controls
Process is similar.In this way, between the minimum and maximum electric current of setting, so that it may obtain without several negative characteristic curves.If
Prepare without welding, the control of welding process can gradually, sequentially enter the slow drop of electric current, receive arc current and lag is held one's breath control
Stage processed eventually makes welding machine close output.Above control process, and meet the basic demand of argon arc welding welding.
In the following, carrying out the explanation of DC pulse argon arc welding control process with " 2T " arc welding gun switch mode of operation: it send in advance
Gas, unloaded foundation, high-frequency and high-voltage (contactless) striking, striking or initial current, electric current rise or the slow liter control stage, and
Prepare to terminate the slow drop of electric current of welding, receive arc current and the controls such as lag is held one's breath, with rank before mentioned-above DC argon arc welding
Section is the same.Unlike: after the control for completing the electric current slow rise time stage, control can be according to the sequence of timing, into arteries and veins
Rush electric current welding stage control.It is welded the stage in pulse current, on the front panel that the output electric current of welding machine is regulated by operator
The given parameters decision of peak point current, background current, pulse frequency, pulse width or duty ratio.Its peak point current, background current
Control, be still current feedback control, with keep different phase electric current stablize.In control sequential, according to setting
Pulse frequency, pulse width or duty cycle parameters, that is, the different burst lengths and and the period, by switch peak value electric current with
The Setting signal of background current can be realized welding machine output electric current and constantly convert between peak point current and background current,
It is achieved that the welding and its time control of pulse current.Above control process, and meet the base of pulsed argon arc welding welding
This requirement.
About in three kinds of welding methods of welding machine, the parts such as course of work and control program of other parts circuit, here
It is just not described in detail and states.
About the circuit anti-interference measure of welding machine of the present invention, mainly there is the following aspects:
1) input filter.See that attached drawing 2, input filter are made of tri- capacitors of CAP0, CAP1 and CAP2 capacitor, varistor RV3.
Mainly the interference signal from power grid is filtered, interference signal is mitigated or reduced and works welding machine control circuit of the present invention
Adverse effect.CAP1 and CAP2 filter capacitor is filtered the voltage after rectification.
2) filtering measures are exported.See attached drawing 2, output filter circuit by output current filtering inductance TM2, filter capacitor C1~
C4, varistor RV1~RV2, resistance R1 composition.It can inhibit current fluctuation, reduce the burr jump signal in current waveform.Separately
Outside, the interference signal from output end is filtered, mitigates or reduces interference signal and works welding machine control circuit of the present invention
Adverse effect.
3) IGBT inverse switch circuit and output rectification interference protection measure.See attached drawing 2, in the inverter main circuit course of work,
IGBT switching device can generate spike interference signal in on-off control process.These interference signals are by being connected in parallel on IGBT
The resistance and capacitor anti-jamming circuit at device both ends is reduced or is controlled.See attached drawing 2, mainly by capacitor C76~C79 and
Resistance R108 composition.And it is connected in parallel on the resistance and capacitor (such as R1~R4, C1~C2) at the both ends fast recovery diode device D1 ~ D2
Anti-jamming circuit can then reduce the spike interference signal in fast recovery diode switching process, prevent overvoltage damage quick
Recovery diode.
4) anti-interference magnet ring.For example, magnet ring L1~L8 on inversion main transformer B secondary windings output line is covered, and
Anti-interference magnet ring CH(10T or circle on high frequency plate and driving plate connecting line).
5) in structure design aspect, there are also the measures of electromagnetic shielding.Driving and operation main control panel plate portion of the invention
Divide to be equivalent to and be surrounded by the metal shell that shell, bottom plate and rear panel, front panel form.Isolation strong electromagnetic, limit can be played
The effects of electromagnetic radiation processed.
Furthermore the U1 chip in attached drawing 3,4, the U2 chip in attached drawing 5, is all A1050 device.The chip is a isolation
Formula CAN transponder.Using it as core and its circuit that form of component of periphery, realize control circuit shown in attached drawing 3,4 and
Being in communication with each other and contacting between attached operation main control panel shown in fig. 5.The circuit formed using them prevents two pieces of controls
Noise current signal on the microprocessor data bus of circuit circuit part or other circuits, which passes through, enters respective micro process
The ground connection of device system, and interfere and damage some Sensitive Apparatuses.In addition to the design of other circuit functional reliabilities and software are anti-dry
It disturbs outside measure, above-mentioned measure is also to guarantee an important prerequisite of welding machine product functional reliability made of circuit of the present invention.
It is the brief control of each circuit part of welding machine of the present invention and argon arc welding, pulsed argon arc welding and manual metal-arc welding method above
Procedure declaration processed.Since the present invention has been presented for the detailed circuit schematic diagram of 2~attached drawing of attached drawing 5, for there is circuit to read
For the people of reading ability (or having interlock circuit knowledge), it can understand completely.Circuit diagram is exactly a kind of noiseless language.
But for not having for the people of circuit reading ability (or not having interlock circuit knowledge), even if more again, the Ta Menye explained
It is elusive.In view of the relationship of length, main part can only be illustrated herein, so that reader better understood when correlation
Working principle and process.
By above description as it can be seen that circuit of the present invention has oneself unique mentality of designing and method.It can not only realize welding machine
The controls such as three kinds of DC argon arc welding, pulsed argon arc welding and manual metal-arc welding welding method output, moreover, designed control circuit and weldering
The complete machine structure of machine is all that welding machine product of the present invention is made to meet security credential requirement, has the technologies such as good control performance excellent
Where the basic reason of gesture, and meet the weight of the production of product high efficiency and low cost, high reliability, manufacturing process technology advance
It ensures.The content of present patent application protection is that the structure for protecting this welding machine designs.
In addition, connecting between circuit board of the invention simply, device is much using automatic placement machine and to insert on circuit board
Part machine completes processing, and production process and production technology are greatly simplified, reduces product weight, production and transportation cost.
The above content is combining specific machine structure and circuit board and control function detailed description made for the present invention,
It cannot be assumed that specific implementation of the invention is only limited to these explanations.The others skilled in the art of technical field of the present invention are come
It says, without departing from the inventive concept of the premise, several other deductions and transformation can also be made, these all should be considered as category
In the scope that the present invention protects.
Claims (10)
1. a kind of IGBT contravariant argon arc welding machine of more welding methods, it is characterised in that: including casing, handle, front panel portion
Divide, argon gas outlet nozzle, the arc welding gun switch socket, master control of positive polarity and negative polarity output rapid connector component, connection argon-arc welding gun
Making sheet, back plate part, internal rectifying and wave-filtering capacitance component, middle partition, rectifier, IGBT module and its cooling fin, output are fast
The Hall biography of extensive diode and its cooling fin, high-frequency arc strike plate and its fixed protection box, inversion main transformer, output electric current measure
Sensor, output filter reactor；The board design of welding machine is six pieces, including high-frequency arc strike plate, master board, driving plate, fast
The two pieces of baffles and output filter band of recovery diode；High-frequency arc strike when high-frequency arc strike plate includes argon arc welding controls electricity
The contactless striking of argon arc welding is realized on road using the high-frequency and high-voltage that the circuit generates；Two pieces of baffles are separately mounted to export
On the fast recovery diode of rectification, circuit is attached with fast recovery diode, realize to the over-voltage of fast recovery diode and
Anti-interference protection；Filter band is connected and is installed close to output par, c, is realized to the filtering of output circuit part, over-voltage and anti-interference
Protection；In driving plate, design has the primary circuit current detecting in the driving circuit, pwm control circuit, inverter main circuit of IGBT
With protection control circuit, DC power supply generation and control circuit, microprocessor control circuit, welding machine output electric current detection and
Feedback control circuit, thermal signal detection and protection control circuit, electromagnetic gas valve control circuit, arc welding gun switch anti-interference control circuit
The circuit of funtion part；In master board, design has many indicator lights, key, parameter regulation encoder, numeral method
Device, and the circuit that a large amount of electric circuit electronics technical component is constituted on the circuit board, are carry different by different circuit parts
Circuit control function；For numeral method device for showing welding parameter, such as starting, peak value of pulse, base value, receives arc current at welding；
The slow liter of preceding gas and rear gas, electric current and ramp down time would when argon arc welding；Pulse frequency, width or duty ratio；Different parameters, it is adjoint
There is different " unit " indicator lights to be indicated；Key include welding method, electric current, pulse parameter, arc welding gun switch mode of operation,
Time sequence parameter, gas time selection key, when selection, have corresponding indicator light to indicate；By welding method key, may be selected straight
Argon arc welding, pulsed argon arc welding and manual electric arc welding are flowed, when selection has corresponding indicator light to indicate；It, can by gas time key
Select preceding gas or rear gas, there is corresponding indicator light instruction in when selection；By arc welding gun switch mode of operation key, 2T or 4T may be selected
Mode, when selection, have corresponding indicator light to indicate；By pulse parameter key, pulse frequency, pulse width or duty may be selected
Than with pulse background current parameter, when selection has corresponding indicator light to indicate；By time sequence parameter key, starting electricity may be selected
Stream, electric current rises or the slow drop of slow rise time, electric current or die-away time, receives arc current, and when selection has corresponding indicator light to indicate；It is logical
Overcurrent key, may be selected welding current or peak point current when impulse welding, and when selection has corresponding indicator light to indicate；Also,
When selecting a certain parameter, the adjusting or setting of corresponding parameter can be carried out by the encoder on operation panel；In addition, being additionally provided with
Power supply and protection indicator light, to carry out state instruction etc.；From the point of view of the function of its circuit, mainly completion input rectifying filtering,
Inversion, output filtering, anti-interference, DC supply generation, pwm pulse width adjusting, IGBT pipe drive control, direct current argon
The selection, instruction and adjusting control of parameters under arc-welding, pulsed argon arc welding and manual metal-arc welding welding method, and different welding sides
The control of timing is welded under method.
2. a kind of IGBT contravariant argon arc welding machine of more welding methods as described in claim 1, it is characterised in that: high-frequency arc strike
Plate control circuit includes high voltage package, striking transformer, spark discharger, four high-voltage capacitances, optocoupler, bidirectional thyristor or controllable
Silicon, protective tube, magnet ring CH, four DC diodes, thyristor or silicon-controlled, bidirectional trigger diode, the detection of TIG arc welding gun switch
Operation control circuit is collectively constituted with some devices of anti-interference control circuit, microprocessor control circuit and their peripheries；
The high-frequency high-voltage signal of high-frequency arc strike passes through in the transformer coupled output loop to inverter main circuit of striking；High-frequency arc ignition circuit
Contactless striking control when for selecting DC argon arc welding or pulsed argon arc welding to weld；Two connecting lines between control circuit
Around 10 circles on magnet ring CH, play a role of anti-interference；Using arc welding gun switch detection and anti-interference control circuit, can prevent from coming from
Arc welding gun switch passes through interference of the bad signal to control circuit caused by circuit when operating；Meanwhile light is also provided in the circuit
Coupling makes only have light to contact between high-frequency arc ignition circuit and control panel circuit, not electric direct connection, that is, carried out it is light-operated every
From；The armature winding of two high-voltage capacitances and striking transformer constitutes oscillating circuit, the Resonant High Voltage high-frequency signal warp generated
The coupling for crossing striking transformer and boosting again, are introduced into secondary loop or the welding circuit of inverter main circuit.
3. a kind of IGBT contravariant argon arc welding machine of more welding methods as described in claim 1, it is characterised in that: the master
The control circuit of control panel is equipped with DC argon arc welding, pulsed argon arc welding and manual electric arc welding；Pulse parameter, i.e. pulse frequency, arteries and veins
Rush width or duty ratio, pulse background current；When time sequence parameter, i.e. initial current, electric current rising or slow rise time, electric current delay drop
Between, receive arc current；2T, 4T arc welding gun switch mode of operation；Preflow or preceding gas time, lag hold one's breath or rear gas time parameter；
The selection key circuit of peak point current when welding current when manual welding, DC argon arc welding or pulsed argon arc welding and its corresponding
LED light control circuit；Equipped with microprocessor control circuit, the control circuit system under the action of software by scanning or
The corresponding port level signal of key is detected, that is, may know that key user has selected, then, can be lighted corresponding on panel
LED light, and show related data, while carrying out corresponding control；Equipped with LED light control circuit, these instructions
Lamp include: pulse frequency, the time, percentage, electric current unit indicator light；Overheating protection, power supply, initial current, pulse frequency,
DC argon arc welding, pulsed argon arc welding, pulse width or duty ratio, manual welding, electric current ramp down time would, pulse background current, lag
It holds one's breath or welding current or pulsed argon arc welding when rear gas time, preflow or preceding gas time, manual welding and DC argon arc welding
When peak point current, 4T and 2T arc welding gun switch mode of operation, receive arc current indicator light；LED light is by chip drives control
Make what they were lighted, and chip is then controlled by microprocessor system, i.e., is controlled by the corresponding terminal signals level of the system
System.
4. a kind of IGBT contravariant argon arc welding machine of more welding methods as described in claim 1, it is characterised in that: the drive
The control circuit of movable plate part includes microprocessor circuit, the generation of DC power supply and control circuit, output characteristics PWM control electricity
The detection and feedback control of road, the driving circuit of IGBT, primary circuit current detecting and protection control circuit, welding machine output electric current
Circuit, electromagnetic gas valve DF control circuit, thermal signal detection and protection control circuit.
5. a kind of IGBT contravariant argon arc welding machine of more welding methods as claimed in claim 4, it is characterised in that: described is straight
The generation in galvanic electricity source and control circuit part, including exported with multichannel AC voltage power transformer, diode, 7805,
7815,7805,7915 integrated regulators and resistance, capacitor element composition around them；Main function be generation+5V ,+
15V ,+3.3V, -15V direct current power source voltage supply corresponding control circuit work.
6. a kind of IGBT contravariant argon arc welding machine of more welding methods as claimed in claim 4, it is characterised in that: described is defeated
Characteristic pwm control circuit includes by many of pwm pulse width modulated chip, operational amplifier and these device peripheries out
Resistance, capacitor and diode component composition.
7. a kind of IGBT contravariant argon arc welding machine of more welding methods as claimed in claim 4, it is characterised in that: described
The driving circuit of IGBT includes driving transformer, metal-oxide-semiconductor field effect transistor, diode and the resistance of their peripheries, capacitor composition；
The driving circuit of four IGBT has four road output control circuits, this four roads circuit, each part is complete one on circuit structure
It causes；Four road PWM output drivings control signal passes through the drive control pole that plug is connected to corresponding IGBT respectively；The driving of IGBT
The control signal of circuit input 11 feet of pwm pulse width modulated chip and 14 feet in output characteristics pwm control circuit
Export pulse control signal；In the case where there is PWM output driving to control signal, IGBT in inverter main circuit can be made according to setting
Fixed switching rule is controlled, so that inverter main circuit be made to complete inversion conversion and control.
8. a kind of IGBT contravariant argon arc welding machine of more welding methods as claimed in claim 4, it is characterised in that: described is first
The detection of grade loop current and protection control circuit include current detecting ring or current transformer, diode, triode and they
Some resistance and the capacitor composition of periphery；It can detect the primary in inverter main circuit by current detecting ring or current transformer to return
Road current signal, the signal are transformed to direct current signal by the rectification circuit that four diodes form, by late-class circuit, as
Overcurrent protection controls signal, is connected to 16 feet of pwm pulse width modulated chip, and when there is shutdown control signal, overcurrent occurs
Or when superheating phenomenon, pwm signal output can be closed by the shutdown control terminal of the chip；Welding machine is defeated due to not having pwm signal
Out, therefore the IGBT switch of four control inversions will be in close state, and stop reversals, welding machine does not also just export.
9. a kind of IGBT contravariant argon arc welding machine of more welding methods as claimed in claim 4, it is characterised in that: the weldering
The detection of machine output electric current and feedback control circuit include the one of Hall current sensor, operational amplifier and their peripheries
A little resistance and capacitor composition, detected output current signal become by the detection and feedback control circuit of welding machine output electric current
After changing, then it is connected to by the output end PA3 of the circuit port PA3 of microprocessor control circuit, believed as Current Negative Three-Point Capacitance
Number Ufi, and together with given value of current signal, participate in the negative-feedback operation control of welding machine output electric current；And negative-feedback operation control
As a result, the port PA4 that microprocessor control circuit will be delivered to, that is, the PA4 letter of output characteristics pwm control circuit part
Number end, the size of the signal decides the signal of welding machine inverter main circuit output voltage and size of current.
10. a kind of IGBT contravariant argon arc welding machine of more welding methods as claimed in claim 4, it is characterised in that: described
Electromagnetic gas valve control circuit includes electromagnetic gas valve, optocoupler, bidirectional thyristor or silicon-controlled, protective tube, diode, arc welding gun switch inspection
It surveys and anti-interference control circuit, microprocessor control circuit forms, when selecting DC argon arc welding or pulsed argon arc welding is welded, if
Arc welding gun switch closure can make shining in the optocoupler in the detection circuit by arc welding gun switch detection and anti-interference control circuit
LED lighting, then, the triode ON in optocoupler；Microprocessor control circuit passes through detection under the action of controlling program
The level signal height of the port PB14, that is, may know that whether arc welding gun switch is pressed；When rifle closes the switch, and PB14 is high level,
Microprocessor control circuit can make the port PA9 export high level under the action of controlling program；Then, bidirectional light controlled thyristor
Or controlled silicon conducting, make bidirectional thyristor or controlled silicon conducting；In this way, alternating voltage is by after diode rectification, acquisition it is straight
Galvanic electricity pressure can be such that electromagnetic gas valve acts；Then, by air supply system, the welding section that protective gas can be transported to welding gun is protected
Shield；In control sequential, arc welding gun switch is pressed, protection of supplying gas can be realized；Also, prior to high-frequency arc strike at the time of starting to supply gas
At the time of；It when release arc welding gun switch, and is when preparing to terminate welding process, microprocessor control circuit will do it electromagnetic gas valve
Delays time to control, the final lag for realizing protective gas holds one's breath control；And the time that preflow and lag are held one's breath, be according to
Two time parameters of family setting determine；These time parameters are once input in microprocessor control circuit, can be protected
It deposits, until replaced new parameter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110508905A (en) * | 2019-07-19 | 2019-11-29 | 苏州威尔达焊接设备有限公司 | A kind of compact-sized source of welding current |
| CN112719523A (en) * | 2020-09-11 | 2021-04-30 | 上海宗镕电器有限公司 | Complete machine circuit principle of three-phase 380V power supply manual arc inverter welding machine |
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| CN112719523A (en) * | 2020-09-11 | 2021-04-30 | 上海宗镕电器有限公司 | Complete machine circuit principle of three-phase 380V power supply manual arc inverter welding machine |
| CN112719523B (en) * | 2020-09-11 | 2023-03-10 | 上海宗镕电器有限公司 | Complete machine circuit principle of three-phase 380V power supply manual arc inverter welding machine |
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