CN109877425A - A kind of IGBT inversion multifunctional welding machine - Google Patents
A kind of IGBT inversion multifunctional welding machine Download PDFInfo
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- CN109877425A CN109877425A CN201811492199.9A CN201811492199A CN109877425A CN 109877425 A CN109877425 A CN 109877425A CN 201811492199 A CN201811492199 A CN 201811492199A CN 109877425 A CN109877425 A CN 109877425A
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Abstract
The present invention relates to a kind of IGBT inversion multifunctional welding machines；Its power supply is single-phase 220~240V, and welding machine interior is designed as left and right side structure, and the components such as circuit board, cooling blower are arranged in side；The components such as wire feeder are arranged in the other side；Board design be two pieces, first is that operation and charactron display control board, it can be achieved that three kinds of welding methods selection and state instruction；The selection of 2T/4T/VRD function and state instruction；Selection and state instruction；Parameter options and its adjusting control；The display of parameter and unit or symbol instruction；Second is that master board, mainly includes inverter main circuit, switching power circuit, inversion PWM and IGBT drive circuit, wire feed and solenoid valve control circuit, output characteristics control circuit；Not only welding method function is more for welding machine of the present invention, solves the problems, such as that simple function welding machine application surface is narrow, welding machine operation interface is poor.
Description
Technical field
The present invention relates to the structures and circuit of a kind of IGBT inversion multifunctional welding machine；Belong to inverter type welder technical field.
Technical background
Currently, the competition in contravariant MIG/MAG gas shielded welding machine product market is very fierce, it is not only embodied in technology
In advanced and advantage, circuit and its function and structure design of welding machine etc. are also depended greatly on.
On domestic and international market, the rated current of IGBT contravariant MIG/MAG gas shielded welding machine is usually negative in 160 ~ 650A(
Carry water holdup 100 ~ 35%) level.Most of such welding machine product is all the MIG/MAG gas shielded arc welding of single power supply
Or additional manual welding function again, and its operation interface is too simple.Application range will receive certain limitation.
For multi-functional, i.e., the MIG/MAG gas shielded arc welding weldering of the functions such as manual electric arc welding, argon arc welding also can be used
Machine, since its is more adaptable, thus the range of its application can be wider.Product sale can be more added with the market competitiveness.However, this
Class welding machine, different circuits, circuit board and complete machine structure design, control principle and mode difference, the layout of circuit board and complete machine
And connection type, or the complexity difference of connection, process and manufacture craft of production etc. are also entirely different.These
It will influence the production and transportation cost of product.For example, some welding machines in the market, control panel are divided into several pieces, fix respectively
On the rack.It is attached between each control panel using many connecting lines.It not only needs to process many control connecting lines, but also
Circuit board takes up space greatly, and package size is big and weight weight.The cost of manufacture of product is just very high in this way, and it is competing to weaken product market
Strive power.Using new control technology, realize that multifunction, numeral method, touch key-press operation, single coder parameters are set,
The technical value added of product is promoted, meanwhile, cost is reduced, the product competition of international market is also beneficial to.Therefore, how it is low at
Under the premise of this, exploitation multifunction, inverter type welder with high content of technology have certain technical difficulty.This is also that the present invention needs
It solves the problems, such as.
Summary of the invention
Welding machine of the present invention has the function of manual electric arc welding and argon arc welding and three kinds of welding methods of MIG/MAG gas shielded arc welding；
Its power supply is single-phase 220~240V；It is internal using left and right layout structure.Circuit board, cooling blower etc. zero is arranged in side
Component；The components such as wire feeder are arranged in the other side.Some devices on additional front and back panel, such as power switch, operation sum number
The parts such as code pipe display circuit board, fan, suction nozzle and electromagnetic gas valve, output quick coupling seat, European welding gun interface.For control
Making sheet circuit part, board design are two pieces of circuit boards, are operation and charactron display control circuit plate and main control respectively
Plate.Have by design for function: by input filter circuit, powering on buffer circuit, input rectifying and filter circuit, capacitor C6 ~ C9
With C15 ~ C16, Q3 ~ Q7, tetra- IGBT pipes of Q4 ~ Q6 and inversion main transformer and its rectification of output fast recovery diode, filtering
The inverter main circuit of the compositions such as reactor；Switching power circuit；Inversion PWM and IGBT drive control circuit；Wire feed and solenoid valve
Etc. control circuits；Output characteristics control circuit；The circuits such as numeral method and operation control circuit.Between each circuit, according to this
The circuit diagram relationship of invention links together.Manual welding, argon arc welding and the various welderings of MIG/MAG gas shielded arc welding three can be met
The every control for connecing method requires and state instruction.For example, circuit through the invention, it is convenient to realize: 1) manual welding, argon arc
Power and energy and the LED status instruction of weldering and gas shield welding；2) output characteristics and parameter of manual welding and argon arc welding are shown and shape
The controls such as state instruction；3) the VRD function control and VRD state instruction of manual welding；4) " inspection silk " of gas shield welding or " examination wire feed " and
" gas inspection " or " examination is supplied gas " control and its indicator light instruction；2T the or 4T mode conversion and control and LED status of arc welding gun switch refer to
Show；Preflow lags time control of holding one's breath；Flat characteristic output control；Voltage, electric current or wire feed rate, inductance return and burn the time
With gage of wire selection, adjust etc. control functions and Parameter units instruction etc..From the point of view of the function of its circuit, mainly complete straight
Flow the generation of power supply, pwm pulse width adjusting, IGBT pipe drive control, three kinds of welding methods inverter circuit input and
Welding parameter (such as electric current, voltage) control, welding method selection and control, arc welding gun switch operation mode, charactron is exported to show
Show the functions such as control.Finally under the action of control circuit, manual electric arc welding, argon arc welding and MIG/MAG gas shield welding are realized respectively
The control performance requirement of three kinds of welding methods.In similar product, there is apparent technique character and performance advantage.In addition, this
Electronic component in each control circuit board of invention, large-sized by way of automatic and a small amount of artificial plug-in unit, installation
On circuit boards.And the electronic component of many small sizes is then to be mounted directly and be welded on electricity by way of automatic chip mounting
On the plate of road.It can simplify the production process of circuit board in this way, reduce manufacturing cost.Secondly, the connection control between circuit board
Line processed reduces to the greatest extent, improves product processes and efficiency, and package size is small, light-weight.That is, using of the invention
Design philosophy and mode reduce product size, reduce transportation cost.Meanwhile by adjusting a small amount of components (such as inversion
Main transformer, output reactance device, IGBT model etc.), can different size easy to form series of products.Therefore, the present invention welds
Machine, not only welding method is multi-functional, moreover, operation interface is good, improves the comprehensive performance of welding machine, the circuit theory of welding machine,
Circuit board and complete machine structure design have the unique distinction of oneself.
Welding machine of the present invention is related to a kind of IGBT inversion multifunctional welding machine, and welding machine has manual electric arc welding and argon arc welding and MIG/
Three kinds of welding method functions of MAG gas shielded arc welding.Using numeral method and LED light state instruction, touch-key behaviour
Make.Parameter regulation or setting are carried out with the use of unity coder using parameter selection key.
The power supply of welding machine of the present invention is single-phase 220~240V, and frequency is 50 or 60Hz.
The inside of welding machine of the present invention uses left and right layout structure.Wire feeder, wire feed dish axle etc. zero is arranged in left side side
Part.Welding wire dish axle is mounted on the middle partition of welding machine interior.Wire feeder is mounted on bottom plate, close to the front panel of welding machine, and
It links together with the European gas shield welding welding gun seat installed on front panel.The right other side arranges that master board, cooling wind are mechanical, electrical
The components such as anti-device.Some circuits and device in additional front and back panels, such as power switch, operation and charactron display control
The parts such as circuit board, fan, suction nozzle and electromagnetic gas valve, output quick coupling seat, European welding gun interface.In welding machine interior, lead to
Middle partition is crossed, internal mechanical part and the master board part of welding machine are separated.Such structure, master board part are suitable
It is surrounded in the metal shell formed by middle partition, shell, bottom plate, rear panel and front panel.Isolation electromagnetic interference can be played, prevented
The effects of electromagnetic radiation.In addition, can be to the power device on circuit board, such as radiator, IGBT are managed, fast recovery diode,
There is preferable cooling air channel, preferably cooled down, ensures the reliability of welding machine work.
The components installed on the front panel of welding machine of the present invention mainly have: European welding gun interface module copperhead, black output
Quick coupling holder assembly, red output quick coupling holder assembly, operation and charactron display control panel.
For operation and charactron display control panel part, in terms of the outside of welding machine, which is equipped with number
Tube display.In the lower section of the display, it is provided with a 1) gas shield welding (MIG)/argon arc welding (TIG)/manual welding (MMA)
Welding method selection key and corresponding indicator light.Gas shield welding (MIG)/argon arc welding (TIG)/manual welding (MMA) power and energy is pressed
Button is used for the selection of corresponding three kinds of welding methods, and has corresponding indicator light to be indicated；2) a 2T(2 step)/4T(4
Step)/VRD(manual welding when unloaded low-voltage output) function selection key and corresponding indicator light.2T(2 step)/4T(4 step) mould
Mode of operation and VRD the function selection of the conversion of formula gas shield welding arc welding gun switch or VRD function select button for arc welding gun switch.2T mould
Formula, which refers to, presses arc welding gun switch, starts to carry out gas shield welding welding.Arc welding gun switch is unclamped then to stop welding.4T mode, which refers to, presses weldering
Rifle switch starts to carry out gas shield welding welding, unclamps arc welding gun switch and continues to keep welding, presses arc welding gun switch again, prepare to terminate
Welding unclamps arc welding gun switch and then stops welding.VRD refers to the unloaded low-voltage output control under selection manual welding (MMA) state.
I.e. if having selected MMA, VRD function could be selected.After selecting VRD, if welding machine is not subjected to, that is, in sky
When load, the output voltage of welding machine can be very low, can be in 20VDC or less.In this way, the use of welding machine can be made safer；3) one
A " inspection silk " or " examination wire feed "/" inspection gas " or " examination is supplied gas " selection key and corresponding indicator light." inspection silk " or " examination wire feed " function
Can, can be used for checking whether wire feed is normal when gas shield welding, it may also be used for weldering is realized under the action of control circuit when installation welding wire
Silk slowly or intermittent feed, be easily installed welding wire be allowed to from welding gun head stretch out." inspection gas " or " examination is supplied gas " function, can be used for selecting
It checks and whether normally to supply gas when selecting gas shield welding, it may also be used for the flow of gas flowmeter is cooperated to adjust；4) unit of electric current, voltage
(such as A, V) indicator light and wire feed symbol indicating lamp.
It on the right of display, is equipped with: 1) a parameter options key；2) a parameter regulation encoder.In selection hand
In the case that work welds (MMA) method, adjustable parameter is welding current.And other welding parameter (such as striking electric currents, thrust
Electric current) then by the built-in setting of control software, it is adjusted without user oneself；It, can in the case where argon arc welding (TIG) method of selection
The parameter of adjusting is welding current；In the case where gas shield welding (MIG) method of selection, adjustable parameter is weldingvoltage, send
Returning for welding arc burns the time when silk speed, gage of wire, receipts arc.
Parameter " option " key, for selecting corresponding adjustable welding parameter under above-mentioned every kind of welding method；Welding
Parameter regulation knob, for adjusting corresponding welding parameter under above-mentioned every kind of welding method.
Overheating protection state instruction is used to indicate whether superheat state occurs.When internal components temperature is excessively high, more than temperature
When the operating temperature of relay, under the action of control circuit, on the one hand superheating phenomenon can occur by numeral method；It is another
Aspect can make welding machine stop welding or output.In the case where welding machine does not export, the effect of cooling blower can make heating device
Temperature reduces.When being reduced to the recovery action temperature of thermal protector, thermal protector restores, and welding machine superheating phenomenon is eliminated.Overheat
Instruction is not also shown.Meanwhile welding machine can weld use again.Such design, the selection of more convenient welding machine operator and makes
With.
The components installed on welding machine rear panel of the present invention mainly have power switch, band plug power supply line, cooling wind
Machine, the protection parts such as gas suction nozzle and electromagnetic gas valve, welding machine grounding screw and mark.Air inlet of the cold wind from welding machine case rear portion
Into some heating devices or components on circuit board can be made to have good cooling effect.Such air duct and the type of cooling are set
Meter, and welding machine of the present invention realize the one of the major reasons of larger current.
For control panel circuit part, board design is two pieces of circuit boards, is operation and charactron display control respectively
Circuit board and master board.For function, major design has: by input filter circuit, power on buffer circuit, input rectifying and
Filter circuit, capacitor C6 ~ C9 and C15 ~ C16, Q3 ~ Q7, tetra- IGBT pipes of Q4 ~ Q6 and inversion main transformer and its output are quickly extensive
The inverter main circuit of the compositions such as multiple diode rectification, filter reactor；Switching power circuit；Inversion PWM and IGBT drive control
Circuit；The control circuits such as wire feed and solenoid valve；Output characteristics control circuit；The circuits such as operation and charactron display control.Each electricity
Between road, circuit diagram relationship according to the invention links together.Manual welding, argon arc welding and MIG/MAG gas can be met
Every control of protection three various welding methods of weldering requires and state instruction.For example, circuit through the invention, it is convenient to real
It is existing: 1) power and energy of manual welding, argon arc welding and gas shield welding and the instruction of the LED state of three kinds of methods；2) manual welding and argon arc welding
Output characteristics and parameter show and electric current and voltage unit instruction etc. control；3) the VRD function control and LED state of manual welding
Instruction；4) " the inspection silk " or " examination wire feed " of gas shield welding and " gas inspection " or " examination is supplied gas " control and its LED state instruction；Arc welding gun switch
2T or 4T mode conversion and control and LED state instruction；Preflow lags time control of holding one's breath；Flat characteristic output control；Electricity
Pressure, electric current or wire feed rate, inductance return and the control functions and Parameter units instruction etc. such as burn time and gage of wire selection, adjust.
From the point of view of the function of its circuit, the mainly generation of completion DC power supply, pwm pulse width adjusting, the driving control of IGBT pipe
System, three kinds of welding methods inverter circuit output and input welding parameter (such as electric current, voltage) control, welding method selection and
The functions such as control, the control of arc welding gun switch operation mode, numeral method.Finally under the action of control circuit, hand is realized respectively
The control performance requirement of three kinds of work arc welding, argon arc welding and MIG/MAG gas shield welding welding methods.In similar product, have bright
Aobvious technique character and performance advantage.In addition, the electronic component in each control circuit board of the invention, large-sized to pass through
The mode of automatic and a small amount of artificial plug-in unit, installation is on circuit boards.And the electronic component of many small sizes is then by automatic
The mode of patch is mounted directly and welds on circuit boards.It can simplify the production process of circuit board in this way, reduce manufacture
Cost.Secondly, the connection control line between circuit board reduces to the greatest extent, product processes and efficiency are improved, package size is small,
It is light-weight.
It, can be by adjusting on circuit board a small amount of zero to the welding machine of the present invention that different current classes and cyclic duration factor require
Component specification parameter forms the product of different output rated current and cyclic duration factor, makes product seriation.For example, changing
The current class and heat sink size of IGBT device；Change the model and parameter of fast recovery diode；Change inversion main transformer pressure
The specification and parameter etc. of device and output filter reactor, can different size easy to form series of products.Certainly, these become
Change, it is therefore an objective to the cost of manufacture of product and the specifications parameter of corresponding machine and performance indicator be made to match.In this way, every kind of specification type
Number welding machine be just able to achieve the cost control of optimization.This just improves the market competitiveness of institute's development.
Welding machine of the present invention, due to have there are three types of welding method use function, solve simple function welding machine application surface it is narrow,
The problem of operation interface difference, thus have better adaptability than the welding machine of simple function.Its good circuit and its structure design
It is also advantage place of the invention, and meets the important guarantor of high efficiency and low cost production, high reliability, manufacturing technology advance
Barrier.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 is protected
The content of shield is that the circuit for protecting this welding machine and structure design.
Detailed description of the invention
Fig. 1 is to utilize a kind of structural schematic diagram of example welding machine made of the present invention；
Subordinate list 1 is that the names of the parts are as follows in Fig. 1:
| Number | Title |
| 1 | Handle |
| 2 | Handle |
| 3 | Knocker |
| 4 | Side cover plate |
| 5 | Wire feed machine welding gun interface |
| 6 | Wire-feed motor |
| 7 | Dipole inversion binding post I |
| 8 | Dipole inversion binding post II |
| 9 | Wire feed dish axle |
| 10 | Middle partition |
| 11 | Casing screw |
| 12 | Power switch |
| 13 | Wire fixer |
| 14 | Power supply line |
| 15 | Electromagnetic gas valve |
| 16 | Cooling blower or fan |
| 17 | Rear plastic mask |
| 18 | Chassis backplane |
| 19 | Plastics wind scooper |
| 20 | Circuit board fixing bracket |
| 21 | Master board |
| 22 | Wind deflector |
| 23 | Hall sensor |
| 24 | Front plastic face mask |
| 25 | Cathode exports quick coupling |
| 26 | Anode output quick coupling |
| 27 | Display and operation control circuit plate |
| 28 | Fast recovery diode |
| 29 | Electrolytic capacitor |
| 30 | Rectifier bridge |
| 31 | Relay |
| 32 | Driving transformer |
| 33 | IGBT |
| 34 | Auxiliary supply transformer |
| 35 | Main transformer |
| 36 | Output reactance device |
Fig. 2 is the structural schematic diagram of master board part in example machine structure schematic diagram of the present invention；
Fig. 3 is the schematic block circuit diagram of welding machine of the present invention；
Fig. 4 is operation and the charactron display control circuit schematic diagram of welding machine of the present invention；
Fig. 5 is the schematic diagram of power circuit part in welding machine master board of the present invention；
Fig. 6 is the schematic diagram of welding machine master board upper wire feeding hose control circuit of the present invention part；
Fig. 7 is the schematic diagram of pulsewidth modulation (PWM) circuit part in welding machine master board of the present invention；
Fig. 8 is the schematic diagram of the parameter control circuits part such as electric current, voltage in welding machine master board of the present invention.
Specific embodiment
As shown in attached drawing 1, attached drawing 2 and subordinate list 1.Attached drawing 1 is to utilize a kind of band manual electric arc welding and argon made of the present invention
The structure design diagram of the MIG/MAG gas shield IGBT inverter type welder of arc-welding function.Subordinate list 1 is the structure design diagram
Main parts size inventory.Attached drawing 2 is the structural schematic diagram of 21 part of master board in example machine structure schematic diagram.Welding machine
Chief component includes:
1) wire-feeding part.Specifically include that the welding wire dish axle 9 when gas shielded arc welding, wire feeder 6, European gas shield welding welding gun connect
Wire-feeding control circuit part on mouth copperhead 5 and master board.Wire feeder 6 and wire feed dish axle 9 are mounted on partition 10 in inside
On.Wire feeder 6 is close to welding machine front panel 24.The European gas shield welding welding gun interface copper installed on wire feeder 6 and front panel 24
First 5 are connected accordingly.When gas shield welding, gas shield welding welding gun and European gas shield welding welding gun interface copperhead 5 are cooperatively connected.Welding wire peace
It is attached in welding wire dish axle 9.Wire feeder 6 can be sent to after welding wire installation.It is conveyed again by European gas shield welding welding gun interface copperhead 5
To the welding gun head being attached thereto.By the wire feed rolls and contact roller of wire feeder 6, under the control of circuit, can make welding wire from
The ignition tip of gas shield welding welding gun stretches out.When gas shield welding, the wire feed rate of welding wire is size-controlled in circuit board and corresponding potentiometer
Control.Adjust the size that wire feed rate is changeable welding current.Protective gas on European gas shield welding welding gun interface copperhead 5 connects
Mouth is connected to electromagnetic gas valve 15 by a tracheae.Protective gas is linked into the gas input of electromagnetic gas valve 15 outside welding machine
Mouthful.After opening gas cylinder, under the control action of welder circuit, 15 switching of electromagnetic gas valve can be made, so that protective gas be made to access
Welding gun, and flowed out from welding gun head, realize the metal coating to welding section.When manual welding, then wire-feeding part is not controlled.
2) casing part.Including the foot pad on handle 1, casing 2,18 bottom plate containing welding machine of knocker 3, side cover plate 4 and bottom plate.
3) 17 part of plastic front board afterwards.The components installed on the rear panel mainly have: power switch 12, power supply line
14, wire fixer 13, cooling fan 16, the gas connector for protecting gas or the parts such as suction nozzle and electromagnetic gas valve 15.Power supply line 14 connects
To power supply grid.The on-off of the control welding machine electric power of power switch 12.Cooling fan 16 to some components of welding machine interior into
Row forced air cooling.Cooling fan 16 is located at the rear portion of welding machine, and the air inlet of cold wind postlaminar part behind welding machine case carries out.It can make
The some heating devices or components of equal parts in master board 21, such as IGBT and Heat Sink A heat sink, fast recovery diode
And the components such as radiator are preferably cooled down.Such air duct and type of cooling design, are conducive to ensure welder circuit work
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.
4) 24 part of plastic front board before.The components of installation mainly have: European welding gun interface module copperhead 5, black output
Quick coupling holder assembly 25, red output quick coupling holder assembly 26, aviation socket, operation and display control panel 27.
A 1) gas shield welding is provided in terms of the outside of welding machine for operation and 27 part of charactron display control panel
(MIG)/argon arc welding (TIG)/manual welding (MMA) welding method selection key and corresponding indicator light.Gas shield welding (MIG)/argon
Arc-welding (TIG)/manual welding (MMA) power and energy button is used for the selection of corresponding three kinds of welding methods, and has corresponding instruction
Lamp is indicated；2) 2T(2 step)/4T(4 step)/VRD(manual welding when unloaded low-voltage output) function selection key and
Corresponding indicator light.2T(2 step)/4T(4 step) mode gas shield welding arc welding gun switch is converted or VRD function select button is opened for welding gun
The mode of operation and VRD function of pass select.2T mode, which refers to, presses arc welding gun switch, starts to carry out gas shield welding welding.Unclamp welding gun
Switch then stops welding.4T mode, which refers to, presses arc welding gun switch, starts to carry out gas shield welding welding, unclamps arc welding gun switch and continues to keep
Arc welding gun switch is pressed in welding again, prepares to terminate welding, is unclamped arc welding gun switch and is then stopped welding.VRD refers to selection manual welding
(MMA) the unloaded low-voltage output control under state.I.e. if having selected MMA, VRD function could be selected.After selecting VRD, if
Welding machine is not subjected to, that is, in it is unloaded when, the output voltage of welding machine can be very low, can be in 20VDC or less.
In this way, the use of welding machine can be made safer；3) one " inspection silk " or " examination wire feed "/" inspection gas " or " examination is supplied gas " selection key and
Corresponding indicator light." inspection silk " or " examination wire feed " function, can be used for checking whether wire feed is normal when gas shield welding, it may also be used for installation
When welding wire under the action of control circuit realize welding wire slowly or intermittent feed, be easily installed welding wire and be allowed to stretch from welding gun head
Out.Normally whether " inspection gas " or " examination is supplied gas " function check when can be used for gas shield welding and supply gas, it may also be used for cooperation gas flowmeter
Flow adjust；4) unit (such as A, V) indicator light and wire feed symbol indicating lamp of electric current, voltage.
It on the right of display, is equipped with: 1) a parameter options key；2) a parameter regulation encoder.In selection hand
In the case that work welds (MMA) method, adjustable parameter is welding current.And other welding parameter (such as striking electric currents, thrust
Electric current) then by the built-in setting of control software, it is adjusted without user oneself；It, can in the case where argon arc welding (TIG) method of selection
The parameter of adjusting is welding current；In the case where gas shield welding (MIG) method of selection, adjustable parameter is weldingvoltage, send
Returning for welding arc burns the time when silk speed, gage of wire, receipts arc.
Parameter " option " key, for selecting corresponding adjustable welding parameter under above-mentioned every kind of welding method；Welding
Parameter regulation knob, for adjusting corresponding welding parameter under above-mentioned every kind of welding method.Overheating protection state instruction is for referring to
Show whether superheat state occurs.
When internal components temperature is excessively high, more than temperature relay operating temperature when, under the action of control circuit, a side
By numeral method superheating phenomenon can occur for face；On the other hand, welding machine can be made to stop welding or output.It is not exported in welding machine
In the case of, the effect of cooling blower can be such that the temperature of heating device reduces.When being reduced to the recovery action temperature of thermal protector,
Thermal protector restores, and welding machine superheating phenomenon is eliminated.Overheat instruction is not also shown.Meanwhile welding machine can weld use again.It is such
Design, the selection and use of more convenient welding machine operator.
5) master board include by input filter circuit, power on buffer circuit, input rectifying and filter circuit, capacitor C6 ~
C9 and C15 ~ C16, Q3 ~ Q7, tetra- IGBT pipes of Q4 ~ Q6 and inversion main transformer and its rectification of output fast recovery diode, filter
The inverter main circuit of the compositions such as wave reactor；Switching power circuit (part POWER)；Inversion PWM and IGBT drive control circuit
(part MIG140)；The control circuits such as wire feed and solenoid valve (part mot)；Output characteristics control circuit (part control) etc.
Part.Physical circuit and its components are as shown in relevant attached drawing 3 and 5~attached drawing of attached drawing 8.
6) operation and charactron display control circuit plate.As shown in attached drawing 3 and attached drawing 4.Operation and charactron display control
Circuit board 27), the circuit board section is other with welding machine by the CON7 plug (the CON1 plug in respective figure 4) in Fig. 3
Circuit part is attached.In numeral method and operation control circuit plate 27) on, circuit is mainly by U2 microprocessor
(STM32F103RCT6), common-anode charactron DS1 and DS2, " Gas check " (inspection gas) and " Wire check " (inspection silk) are pressed
Key K2, TIG(argon arc welding)/MMA(manual welding)/MIG(gas shield welding) three kinds of welding method selection key K3,2T/4T arc welding gun switch
Operation mode and VRD function selection key K4, Parameters Selection(parameter options) key K6, BMQ parameter regulation
The optocoupler U3(signal terminal that encoder K1, control are supplied gas is SQ.When supplying gas, SQ signal be high level), control wire feed optocoupler
U4(signal terminal is SS.When wire feed, SS signal is low level), (signal terminal is for overheat or over-current detection and control circuit
OC), IND inductance parameters adjusting control circuit (including KR1~KR3 relay and its peripheral component.Relay can be individually
Movement is also possible to two or three relays simultaneously operation.By controlling the different actuating of relay, corresponding concatenated resistance
Value is different, so that it adjusts different di/dt(current changing rates), and different current changing rates represents corresponding inductance
IND value is different.The combination of actions form of relay has eight kinds, and therefore, inductance IND value can change between 1~8.), electricity
Press detection circuit (signal terminal UDP), current detection circuit (signal terminal IDP), PWMU output voltage conversion circuit (its
Output be the given control signal of Ug voltage), it is output current converter circuit (it is that IgOUT given value of current controls signal that it, which is exported), defeated
The part such as voltage conversion circuit (it is the given control signal of UgOUT voltage that it, which is exported) forms out.The effect of the partial circuit is: 1)
Realize TIG(argon arc welding)/MMA(manual welding)/MIG(gas shield welding) three kinds of welding method selections and control.The control of U2 microprocessor
System realizes conversion, the control of three kinds of welding methods by detecting key K3 state.A K3 key is often pressed, a kind of weldering is changed
Connect method.When multiple button operation, successively, the different welding method of varying cyclically.When selecting MMA, MMA-EN terminal signals are
High level, MIG-EN terminal signals are low level.When selecting MIG, MMA-EN terminal signals are low level, MIG-EN terminal signals
For high level.GUN-CHECK is arc welding gun switch signal detection.By detection, it can confirm whether arc welding gun switch is pressed.When MIG is welded,
If pressing welding gun, correspondingly controlled according to the welding process requirement of MIG weldering or gas shield welding.For example, control protection gas
The conveying of body；Control wire feed or welding current；Control welding machine output voltage etc.；2) realize 2T/4T arc welding gun switch operation mode and
The selection control of VRD function.U2 microprocessor control system realizes that two kinds of (2T and 4T) welding guns are opened by detecting key K4 state
Close operation mode and VRD power and energy.In the case where selected gas shielded welding method, a K4 key is often pressed, 2T or 4T welding gun is opened
Operation mode is closed just to change once.When multiple button operation, successively and varying cyclically.Low no-load electricity when VRD(welding machine does not weld
Pressure output) function, it is set only for manual soldering method.I.e. only in the case where selecting manual soldering method, Cai Nengtong
K4 key is crossed, VRD function is selected.When selected manual welding method, but when not selecting VRD function, when welding machine zero load, then exports higher
Floating voltage.Conversely, low-voltage when then exporting VRD；3) " Gas check " (inspection gas) and " Wire check " (inspection are realized
Silk) selection and control.In the case where selecting gas shielded welding method, microprocessor control system, by detecting key K2 state,
Realize the conversion of " Gas check " (inspection gas) or " Wire check " (inspection silk).A K2 key is often pressed, a kind of detection side is changed
Formula；4) it realizes and corresponds to the selection of respective welding parameter (by Parameters Selection parameter under every kind of welding method
Selection key K6 come realize selection) and adjust control (after choosing parameter item, specifically joined using BMQ encoder K1
Number is adjusted).Under every kind of selected welding method, pass through Parameters Selection parameter options key K6 and BMQ
The corresponding welding parameter of the welding method can be changed in parameter regulation encoder K1.For example, in selected manual welding or the feelings of argon arc welding
Under condition, corresponding welding parameter only has welding current.BMQ encoder K1 is adjusted, that is, exports electric current (parameter) when welding can be changed
Size.In the case where selecting gas shielded welding method, selectable welding parameter has: gage of wire (0.6,0.8 and 1.0mm tri-
Kind of welding wire), (IND value can select inductance between 1~8.The change of inductance parameters, electric arc when will affect gas shield welding welding are special
Property, so that welding process, stability, splashing size and appearance of weld etc. can be changed), fine tuning weldingvoltage (can be in standard value
Change between ± 5V.Weldingvoltage and welding current or wire feed rate are set using unified regulative mode, that is, are changed and sent
Silk speed or welding current, corresponding weldingvoltage standard value can change correspondingly.And weldingvoltage is finely tuned, it can play in standard
On the basis of value, the effect that is increased or decreased.User is also beneficial to according to actual welding condition, welding parameters carry out
Adjustment appropriate) and return burn the time (can change between 0~1S.The size for burning the time is returned, welding machine gas shield welding can be changed and receive arc rank
The state of a control of section.The time is burnt in different returning, can be to the stage that welding process terminates fastly, that is, receives the weld seam arc crater in arc stage
Filling, welding wire head go bead, arc re-ignition etc. to have an impact.)；5) the various states of welding machine, parameter and unit can be achieved
Display.It under the control of microprocessor control system, can show: welding current and its symbol (A) when manual welding, or welding electricity
Stream and its symbol (A) symbol；Welding current and its symbol (A) when argon arc welding；Welding current and its symbol (A) when gas shield welding
Or wire feed rate and its symbol, voltage and its symbol (V).I.e. under the control of U2 microprocessor control system, three kinds can be lighted
The light emitting diode of corresponding welding method symbol (such as TIG, MMA, MIG) in welding method.For example, being represented when VD5 is lighted
MIG(gas shield welding is selected).When VD6 is lighted, representative has selected TIG(argon arc welding).When VD7 is lighted, representative has selected MMA(hand
Work weldering or manual electric arc welding)；Welding current and its symbol (A) or welding current and its symbol (A) and VRD function when manual welding
It can symbol.When VD3 is lighted, indicate that the unit of display parameters is " A " (ampere).When VD10 is lighted, representative has selected VRD function
(low no-load voltage output function when manual welding)；Welding current and its symbol (A) when argon arc welding；Welding electricity when gas shield welding
Parameters and its symbol such as stream and its symbol (A), voltage and its symbol (V).When VD4 is lighted, indicate that the unit of display parameters is " V "
(volt).In addition, representative has selected 2T arc welding gun switch operation mode when VD8 is lighted.When VD9 is lighted, representative has selected 4T welding gun
Switched operating mode.When VD11 is lighted, representative has selected Gas Check(to examine gas) operation.When VD11 is lighted, representative is selected
Wire Check(examines silk) operation.When VD1 is lighted, representative has selected IND(inductance) parameter options.When VD2 is lighted, selection is represented
SPEED(wire feed rate) parameter options；6) electric current, the detection of the real-time welding parameter of voltage and output conversion and control are realized.IDP
Actual current signal is represented, output current detection circuit is come from.UDP represents actual current signal, from output voltage detection electricity
Road.U2 microprocessor control system, by detecting given welding parameter, final output control parameter, by respective conversion
Circuit, the UgOUT voltage for being respectively converted into analog quantity gives and IgOUT given value of current controls signal, is used for welding machine output characteristics
Control；7) overheat and over-current detection and control are realized.OC when having detected overheat or overcurrent abnormal phenomenon, in attached drawing 5
Terminal signals are low level.Conversely, then abnormal without occurring.Microprocessor control system is sentenced by detecting OC or ICS signal
Machine is broken whether to occur overheating or over-current phenomenon avoidance.If there is exception, then corresponding control signal can be issued, is controlled accordingly
And display.For example, the signal of the Tc connection CON8 interface in attached drawing 3 is heat alarm.CON8 interface is connected to the temperature of open type
Spend relay.And the aluminium alloy that temperature relay is tightly attached to Q3~Q7 IGBT or D7~D12 output fast recovery diode dissipates
On hot device.When temperature relay movement, show that superheating phenomenon occurs for main power device.At this point, Tc current potential is drawn in attached drawing 8
Down to low level (GND), meanwhile, control circuit will close pwm signal PWM-STOP；The end OC/OT issues corresponding signal to panel
Display and operation control interface stop welding machine output or welding by showing and operation control circuit detects and controls
Work, prevents welding machine from burning out because of overheat.Under the action of cooling blower, when the temperature of aluminium alloy heat radiator drops to certain journey
After degree, the superheating phenomenon of welding machine interior is eliminated, and when thermal protector restores, control circuit can just continue to output pwm control signal.Together
When overheat instruction eliminate.Which achieves welding machine overheating protections.
As shown in attached drawing 1 and subordinate list 1.Welding machine of the present invention, two groups of output quick coupling holder assemblies 25 when manual electric arc welding,
26) for being separately connected welding clamp cable and workpiece clamp cable.Polarity when connection can determine according to the type and requirement of welding rod
Surely the mode connected.Red represents positive output；Black represents negative output；When argon arc welding, it is defeated that argon-arc welding gun is connected to negative polarity
Quick coupling holder assembly 25 out, and positive polarity output quick coupling holder assembly 26 is then connected to the workpiece welded.The tracheae of welding gun
Air supply system is connected to by the tracheae of external connection；Welding gun is connected to European welding gun interface module copperhead 5 when gas shield welding.Black
Quick coupling holder assembly 25 is exported commonly used in connection workpiece clamp welding cable.This connection type is known as being reversely connected or reversed polarity connects
It connects.Certainly, since red binding post 8, black binding post 7 are connected respectively to the positive and negative polarity of circuit board inverter main circuit output
End, using the two binding posts, by the wiring position exchange of welding machine interior connecting wire, it can be achieved that the positive polarity that welding exports
Connection type conversion.Actually using reversal connection or reversed polarity connection, or using positive polarity connection type, depends on gas shield welding and weld
The requirement of the type and welding procedure of silk.
Device on the circuit board of welding machine of the present invention mainly uses certainly if it is the electronic component or components of plug-in type
The dynamic mode with artificial plug-in unit, welding is processed to complete circuit board.And to patch type electronic component a large amount of on circuit board, then
Circuit board processing is all completed by the way of automatic chip mounting and welding.Just think, if all component and components are all
It is not patch type, then the size of circuit board is inevitable very big.This will increase the size and weight of welding machine；If as other more
The welding machine of board structure of circuit is such, there is many control connecting lines between circuit board, then production process will necessarily be more, produces work
Skill also can be complicated.The present invention has fully considered above-mentioned influence factor.By designing repeatedly, keep circuit board size small, it is compact-sized,
It is few to connect control line, therefore the board production manufacturing procedure of welding machine of the present invention is few, manufacture craft is greatly simplified, more convenient life
It produces.Such design and processing technology, it is ensured that the production of product has very high production efficiency, meanwhile, error rate and production
It is at low cost, be conducive to improve the competitiveness of product in market.
In addition, in structure design aspect, as shown in Fig. 1, by middle partition, the inside left mechanical part of welding machine with
The motherboard circuit part on right side separates.The part such as the master board circuit on right side is equivalent to by middle partition, shell, bottom plate, back
The shell of plate and front panel composition surrounds.Isolation high current strong electromagnetic can be played, it is reliable to improve welding machine for limit electromagnetic radiation
The effect of property.
3 ~ attached drawing of attached drawing 8 together constitutes the complete control circuit schematic diagram of welding machine.Each control circuit board plate, it is more additional
Control line and components are connected, are linked together according to circuit diagram.It is main from the point of view of the control function of interlock circuit of the present invention
If completing input filter, the generation of each circuit direct pressure stabilizing power supply, welding method selection and control, " inspection silk " or " examination
Wire feed ", " inspection gas " or " examination is supplied gas " operation, the driving of pwm pulse width adjusting, IGBT pipe and inversion control, output rectifying conversion,
And the work such as the corresponding inverter circuit output parameter of three kinds of welding methods (electric current or wire feed rate, voltage) control.Finally exist
Under the action of control circuit, every control of manual electric arc welding (MMA), argon arc welding (TIG) and MIG/MAG gas shield welding is realized respectively
It is required that.
The working principle of welder circuit of the present invention is summarized as follows:
As shown in attached drawing 1 and attached drawing 3.The main circuit of welding machine mainly by power input switch S1, input filter circuit, power on buffering
Circuit, rectifier DB1, electrolytic capacitor filter C8 ~ C9, capacitor C6 ~ C7 and C15 ~ C16, four IGBT pipe Q3 and Q7 and Q4 and Q6,
Main transformer T1, main transformer primary current detection mutual inductor L3, six MU6030 fast recovery diode D7~D12, output electric current
Filter inductance L2, output Hall current detection sensor (current sensor) and it is some output and input resistance, input
With the parts thereofs such as output filter capacitor, anti-interference capacitor and resistance and electronic component composition.
Referring to attached drawing 3,220V~240V input supply voltage is connected to power supply switch S1.By on welding machine rear panel
Power switch S1 connect electric network source.From power grid come alternating current, first pass through be made of resistance R1 ~ R2, capacitor C2 ~ C3 it is defeated
Enter filter circuit.The main function of the circuit is the interference for reducing electric network source to inverter welder circuit, improves the work of welding machine
Reliability.
Referring to attached drawing 3, input AC electricity passes through by RR1 and RR2 thermistor, relay K1 and field-effect tube Q1, two poles
Become pulsating direct current after what the components such as pipe D2, voltage-stabiliser tube D3 formed powers on buffer circuit part, then after rectified device DB1 rectification
Electricity.And charge to C8 ~ C9 electrolytic capacitor, voltage gradually rises, and eventually becomes relatively stable high voltage direct current.
It referring to attached drawing 3, is rectified by rectifier (30) DB1, after electrolytic capacitor filtering, the high voltage direct current of acquisition is on the one hand
Supply manages (such as K75T60), T1 inversion main transformer by capacitor C6 ~ C9 and C15 ~ C16, Q3 and Q7 and Q4 and tetra- IGBT of Q6
With D7 ~ D12(such as MU6030 etc.) fast recovery diode, L2 output current filter reactor or inductance, output Hall current inspection
Survey the inverter main circuit of compositions such as sensor (current sensor, 400A/4v).Its function is main are as follows: high voltage dc bus
Voltage is converted to intermediate frequency (tens KHz) alternating current.The transformation of T1 inversion main transformer realization voltage step-down and High-current output.D7
~ D12(such as MU6030 etc.) it is that the medium frequency alternating current of contravariant transformer output is transformed to direct current if fast recovery diode.By
It is to pulse in its transformed current waveform, it is unstable, it is unfavorable for the stabilization of welding process, therefore, electric current is exported using L2
Filter reactor or inductance are filtered.The current waveform exported in this way will become stable, and help to obtain the weldering of high quality
Seam.
On the other hand, referring to attached drawing 3, by plug CON1, high voltage dc bus voltage supplies switching power circuit (attached drawing
In 3, there is the green circuit part of POWER letter).The schematic diagram of specific Switching Power Supply is shown in attached drawing 5.About this portion of Switching Power Supply
The working principle divided makees a brief description here.Switch power supply routes T3 switching mode power supply transformer, Q30 metal-oxide-semiconductor, D83
With D85 ~ D87 fast diode, U16(UC3845 integrate pwm circuit) and U18 ~ U20 integrated regulator and they around
The switching power circuit of the devices such as resistance, capacitor composition, generation+5V ,+15V ,+24V, -15V supply voltage supply other corresponding
The live line works such as control circuit.Input power is connected to high voltage dc bus voltage+310V.Thus, Switching Power Supply U16 PWM
The circuit of the UC3845 of control and its peripheral resistance, capacitor composition belongs to high tension loop.For the safety for ensuring control circuit, attached
In Fig. 5, it is isolated using the PC817 photoelectrical coupler of U17.Switching Power Supply PWM control platelet kernel control chip be
U16, i.e. UC3845 pwm pulse width adjustor.Resistance, the capacitor of its periphery can set the relevant parameter of its work.As for such as
What is determined, needs to check the data or explanation used in connection with of UC3845.It is not repeated herein.In short, 6 feet of U16 chip export
Pulse be certain working frequency driving pulse, the Q30 metal-oxide-semiconductor in attached drawing 5 can be made to be in on-off working condition.It is opened in T3
The voltage follower circuit part of power transformer is closed, respectively acquisition+5V ,+15V ,+24V, -15V supply voltage.Supply is other
Control circuit work uses.In addition, by circuit and the schematic diagram of switching power supply parts it is found that the present invention does not use general control
Transformer processed and relevant voltage conversion circuit generate above-mentioned several supply voltages.Its circuit takes height of the electricity in major loop
Press DC bus-bar voltage+310V.The volume and size of switch transformer are significantly less weight than general control transformer, this is just dropped
The cost of low welding machine of the present invention, improves the technical value added of welding machine.
It is first by RR1 and RR2 thermistor, relay K1 and field-effect tube Q1, diode D2, voltage-stabiliser tube D3 etc. in attached drawing 3
Device composition powers on buffer circuit part.K1 pull up time lags behind power switch S1 and closes the moment.I.e.
K1 relay is deferred action.After the charging voltage on C8 ~ C9 electrolytic capacitor is stablized, K1 relay is just acted, contact
Be closed RR1 and RR2 thermistor, when making welding machine of the present invention normal inversion work, high current be from the contact 3-4 of K1 relay it
Between flow through.Such circuit is known as powering on buffer circuit.Mainly prevent power switch from connecting moment, since C8 ~ C9 is electrolysed
There is no voltage on capacitor, be equivalent to short circuit, will form biggish surge current, burns out power switch S1.And power on buffer circuit
Effect, exactly by close a floodgate moment seal in RR1 and RR2 thermistor, carry out limit inrush currents.Also, RR1 and RR2 heat
The resistance value of quick resistance is to rise with its temperature and increase.Therefore, preferable protective effect can be played by powering on buffer circuit.This
Powering on buffer portion circuit is realized by following control mode: in attached drawing 3, the formation of+24V voltage can lag behind welding machine
At the time of power supply switch S1 closes.Voltage on capacitor C5 is stepped up after+24V voltage adds.Because R6 and
C5 constitutes integrating circuit.When the voltage on capacitor C5 is increased to certain value, metal-oxide-semiconductor Q1 could be connected.In this way, K1 relay is
It can act.
See attached drawing 3 and attached drawing 7, T2 driving transformer, U13 integrate PWM chip (SG3525A) and surrounding diode,
Voltage-stabiliser tube, resistance, capacitor etc. form inversion PWM, driving circuit and the overcurrent and overheating protection of Q3 and Q7 and Q4 and Q6 IGBT pipe
Control circuit part.Q3 and Q7 and Q4 and Q6 IGBT pipe, the circuit form of two-way drive part are substantially coincident.Due to U13
11 feet of chip and 14 foot output pwm signal driving powers are small, therefore need to form by devices such as Q26 ~ Q29, U14 and U15
Drive control circuit carries out power amplification.Isolating transformer is driven to remove control Q3 and Q7 and Q4 and Q6 IGBT pipe by T2 again
On-off working condition.In attached drawing 7,11 feet of U13 chip and 14 feet output control signal are two groups of PWM square-wave pulse signals.
The frequency of its square wave be it is fixed, have tens KHz.The resistance and capacitance parameter (such as R171 that it is connected by RT, CT foot of the chip
With C83 etc.) it determines.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 one of the important parameter for ensureing the alternation of two groups of switches of IGBT.The time be by the peripheral components of U13 chip (such as
R171 and C83 etc.) parameter setting and determination.As to how determining, the data used in connection with or explanation of U13 chip are checked
Understand.It is not repeated herein.What needs to be explained here is that: the pwm pulse bandwidth modulation signals of U13 chip output are to determine welding machine
The signal of inverter main circuit output voltage and size of current.Its pulse width depends on: 1) manual welding (MMA) state of a control
When, it is codetermined by welding current Setting signal and output current feedback signal.The object or target of control are that output electric current is big
It is small.When unloaded, feedback signal very little.Control circuit generates a biggish pwm pulse signal of duty ratio, make Q3 and Q7 and Q4 and
Two groups of IGBT of Q6 are in alternating conductive state, finally make inverter main circuit output no-load voltage.When operator regulates front panel
The potentiometer of upper welding current, and when being welded, control circuit passes through the Hall sensor (current in attached drawing 3
Sensor, 400A/4v), output current signal can be detected.On the one hand, the output current signal that welding current table is shown is obtained.
Electric current number is realized under the action of other control circuits (the mainly operation and display control circuit of 4 part of attached drawing 3 and attached drawing)
Word is shown.On the other hand, the current signal detected, in (the mainly output of 8 part of attached drawing 3 and attached drawing of other control circuits
Characteristic controling circuit) under the action of, by processing such as signal amplifications, and in this, as current feedback control signal, with welding
Given value of current signal is compared.Difference signal after comparing carries out PI(ratio and integral) adjust control, the result of output
The pulse width or duty ratio for controlling welding machine output PWM chip determine the size of welding machine output electric current and voltage, realize output electricity
Stream parameter accurately controls.And the dropping characteristic for dragging the output characteristics constant current band of welding machine outside.It further says, when welding electricity
Flow Setting signal it is constant when, the electric current detected with welder circuit increases, also, after reaching given setting value, welding electricity
The difference for flowing Setting signal and 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.The feedback control only just to work after electric current reaches the setting value of welding current potentiometer.This
Afterwards, the increase small with electric current, voltage reduces can be very much.When voltage drops to 16V or less, with the reduction of voltage, control
Circuit processed can be such that the pulse width of welding machine output PWM chip or duty ratio increases, and increase welding current according to the parameter of setting,
Ultimately form the dropping characteristic dragged outside constant current band.When welding current Setting signal variation, Current cut-off negative feedback setting value is not
Together, but other control processes are similar.In this way, between the minimum and maximum of potentiometer setting, so that it may obtain without several
Negative characteristic curve.Such control, and meet the basic demand of manual arc welding.2) argon arc welding (TIG) state of a control
When, control process is much like with above-mentioned manual welding.Only without 16V it is below it is outer drag stage control, but make welding machine
Output characteristics be constant current dropping characteristic.3) it when gas shield welding state of a control, is fed back by weldingvoltage Setting signal and output voltage
Signal etc. codetermines.The object or target of control are output voltage sizes.It is controlled using negative voltage feedback PI.When unloaded, with
Manual welding control is similar, is still the biggish pwm pulse width signal of output, obtains floating voltage.After bringing onto load, then with craft
The control of weldering is different.The output characteristics control of gas shield welding, welding machine is flat characteristic, rather than the decline dragged outside constant current band is special
Property.Its main feature is that: load current changes greatly, and output voltage varies less, and keeps relative stability.Only when the given letter of voltage
When number changing, the voltage of output just will appear large change.The above control process is by corresponding control circuit come real
Existing.
See in attached drawing 3 and attached drawing 7, L3 is a main transformer primary current detection mutual inductor or current detector, be can detect inverse
Become in main circuit, the primary current signal of main transformer.It exports LP1 and LP2 and send to inversion PWM pulsewidth modulation and IGBT driving
Etc. control circuits (having the green portion of MIG140 in attached drawing 3, physical circuit is as shown in attached drawing 7).Mainly check the main electricity of inversion
Whether road occurs over-current phenomenon avoidance.If there is overcurrent, the overcurrent indicator light VD in attached drawing 7 is lighted；VS1(SCR thyristor) conducting,
The cathode potential of D77 diode is pulled low to low level (GND), triode Q24 cut-off, Q25 conducting, the foot of U13 chip 11 and 14
The pwm signal of output is closed, and the driving control signal of tetra- IGBT pipes of Q3 and Q7 and Q4 and Q6 in welding machine inverter main circuit is closed
It closes, welding machine closes output.Meanwhile it can indicate that superheating phenomenon occurs on the charactron of panel；The end OC/OT also issues corresponding signal.
See in attached drawing 3 and attached drawing 7, the control circuits part such as inversion PWM pulsewidth modulation and IGBT driving (has in attached drawing 3
The green portion of MIG140, physical circuit is as shown in attached drawing 7), output G1 and E1, G2 and E2 are respectively two groups of pwm pulse letters
Number, the switching state of two groups of IGBT switching tubes of Q3 and Q7 and Q4 and Q6 in control inverter main circuit is gone respectively.The pwm signal
Pulse width is controlled by PWM-GD input Setting signal.Whether there is or not pwm signals, then depend on PWM-STOP and Tc.For example, attached drawing 3
In the signal of Tc connection CON8 interface be heat alarm.CON8 interface is connected to the temperature relay of open type.And temperature after
Electric appliance is tightly attached to again on the aluminium alloy heat radiator of Q3, Q7 IGBT or D7 ~ D12 output fast recovery diode.Work as temperature relay
When movement, show that superheating phenomenon occurs for main power device.At this point, Tc current potential is pulled low to low level (GND), together in attached drawing 7
When, control circuit will close pwm signal；The end OC/OT issues corresponding signal to Display panel and operation control interface, passes through
Display is detected and controlled with operation control circuit, and the charactron on panel is made to indicate that superheating phenomenon occurs.Prevent welding machine because of mistake
Heat and burn out.Under the action of cooling blower, after temperature dropped to a certain extent for aluminium alloy heat radiator, the mistake of welding machine interior
Thermal phenomenon is eliminated, and when thermal protector restores, control circuit can just continue to output pwm control signal.Instruction is overheated simultaneously to eliminate.This
It is achieved that welding machine overheating protection.PWM-STOP then comes from electric current, voltage and output characteristics control circuit (see shown in attached drawing 8) portion
Point.When welding machine not output voltage or when electric current, PWM-STOP signal can close pwm signal, make in inverter main circuit Q3 and Q7 and
Q4 and two groups of IGBT switching tubes of Q6 are in an off state.
As shown in attached drawing 3 and attached drawing 4.Operation and charactron display control circuit plate, the circuit board section pass through in Fig. 3
CON7 plug (the CON1 plug in respective figure 4) and other circuit parts of welding machine are attached.In numeral method and behaviour
Make in control circuit board, circuit is mainly by U2 microprocessor (STM32F103RCT6), common-anode charactron DS1 and DS2, " Gas
Check " (inspection gas) and " Wire check " (inspection silk) key K2, TIG(argon arc welding)/MMA(manual welding)/MIG(gas shield welding) three
Kind welding method selection key K3,2T/4T arc welding gun switch operation mode and VRD function selection key K4, Parameters
Selection(parameter options) key K6, BMQ parameter regulation encoder K1, the optocoupler U3(signal terminal supplied gas of control be SQ.
When supplying gas, SQ signal is high level), control wire feed optocoupler U4(signal terminal be SS.When wire feed, SS signal is low level),
Overheat or over-current detection and control circuit (signal terminal OC), IND inductance parameters adjusting control circuit (including KR1~KR3 after
Electric appliance and its peripheral component.Relay can be single movement, be also possible to two or three relays simultaneously operation.Pass through
The different actuating of relay is controlled, corresponding concatenated resistance value is different, so that it adjusts different di/dt(current changing rates),
And different current changing rates represents corresponding inductance IND value and is different.The combination of actions form of relay has eight kinds, because
This, inductance IND value can change between 1~8.), voltage detecting circuit (signal terminal UDP), current detection circuit (signal
Terminal is IDP), PWMU output voltage conversion circuit (it is the given control signal of Ug voltage that it, which is exported), output current converter circuit
(it is the given control letter of UgOUT voltage that it, which is exported, for (it is IgOUT given value of current control signal that it, which is exported), output voltage conversion circuit
Number) etc. part form.The effect of the partial circuit is: 1) realizing TIG(argon arc welding)/MMA(manual welding)/MIG(gas shield welding) three
The selection of kind welding method and control.U2 microprocessor control system realizes three kinds of welding methods by detecting key K3 state
Conversion, control.A K3 key is often pressed, a kind of welding method is changed.When multiple button operation, successively, varying cyclically it is different
Welding method.When selecting MMA, MMA-EN terminal signals are high level, and MIG-EN terminal signals are low level.When selecting MIG,
MMA-EN terminal signals are low level, and MIG-EN terminal signals are high level.GUN-CHECK is arc welding gun switch signal detection.It is logical
Detection is crossed, can confirm whether arc welding gun switch is pressed.When MIG is welded, if pressing welding gun, according to MIG weldering or the welding of gas shield welding
Technique requires correspondingly to be controlled.For example, the conveying of control protective gas；Control wire feed or welding current；It is defeated to control welding machine
Voltage etc. out；2) 2T/4T arc welding gun switch operation mode and the selection of VRD function and control are realized.U2 microprocessor control system leads to
Detection key K4 state is crossed, realizes two kinds of (2T and 4T) arc welding gun switch operation modes and VRD power and energy.In selected gas shield welding side
In the case where method, as soon as often pressing time K4 key, 2T or 4T arc welding gun switch operation mode changes primary.When multiple button operation, according to
Secondary and varying cyclically.Low no-load voltage output when VRD(welding machine does not weld) function, it is set only for manual soldering method
It is fixed.I.e. only in the case where selecting manual soldering method, K4 key could be passed through, select VRD function.When selected manual welding side
Method, but when not selecting VRD function, when welding machine zero load, then export higher floating voltage.Conversely, low-voltage when then exporting VRD；
3) selection and control of " Gas check " (inspection gas) and " Wire check " (inspection silk) are realized.In the feelings of selection gas shielded welding method
Under condition, microprocessor control system realizes " Gas check " (inspection gas) or " Wire check " by detecting key K2 state
The conversion of (inspection silk).A K2 key is often pressed, a kind of detection mode is changed；4) it realizes and corresponds to respective weldering under every kind of welding method
Connect parameter selection (selection is realized by Parameters Selection parameter selection key K6) and adjust control (when
After choosing parameter item, specific parameter regulation is carried out using BMQ encoder K1).Under every kind of selected welding method, lead to
Parameters Selection parameter options key K6 and BMQ parameter regulation encoder K1 is crossed, the welding method pair can be changed
The welding parameter answered.For example, corresponding welding parameter only has welding current in the case where selected manual welding or argon arc welding.It adjusts
The size of electric current (parameter) is exported when saving BMQ encoder K1, i.e. changeable welding.It, can in the case where selecting gas shielded welding method
The welding parameter of selection has: gage of wire (0.6,0.8 and 1.0mm, tri- kinds of welding wires), (IND value can select inductance between 1~8.
The change of inductance parameters will affect arc characteristic when gas shield welding welding, to can change welding process, stability, splash greatly
Small and appearance of weld etc.), fine tuning weldingvoltage (can change between ± the 5V of standard value.Weldingvoltage and welding current are sent
Silk speed is set using unified regulative mode, i.e. change wire feed rate or welding current, corresponding weldingvoltage standard
Value can change correspondingly.And weldingvoltage is finely tuned, it can play the role of on the basis of standard value, be increased or decreased.?
Be conducive to user according to actual welding condition, welding parameters carry out adjustment appropriate) and return the burning time (can 0~1S it
Between change.The size for burning the time is returned, the state of a control that welding machine gas shield welding receives the arc stage can be changed.The time is burnt in different returning, can be right
Bead, arc re-ignition etc. are removed in the stage that welding process terminates fastly, that is, the weld seam arc crater filling in receipts arc stage, welding wire head
It has an impact.)；5) display of welding machine various states, parameter and unit can be achieved.Under the control of microprocessor control system,
It can show: welding current and its symbol (A) or welding current and its symbol (A) symbol when manual welding；Welding when argon arc welding
Electric current and its symbol (A)；Welding current and its symbol (A) or wire feed rate and its symbol, voltage and its symbol when gas shield welding
(V).I.e. under the control of U2 microprocessor control system, welding method symbol corresponding in three kinds of welding methods can be lighted
The light emitting diode of (such as TIG, MMA, MIG).For example, representative has selected MIG(gas shield welding when VD5 is lighted).When VD6 is lighted, generation
Table has selected TIG(argon arc welding).When VD7 is lighted, representative has selected MMA(manual welding or manual electric arc welding)；Weldering when manual welding
Connect electric current and its symbol (A) or welding current and its symbol (A) and VRD functional symbol.When VD3 is lighted, display parameters are indicated
Unit is " A " (ampere).When VD10 is lighted, representative has selected VRD function (low no-load voltage output function when manual welding)；Argon
Welding current and its symbol (A) when arc-welding；The ginseng such as welding current and its symbol (A), voltage and its symbol (V) when gas shield welding
Several and its symbol.When VD4 is lighted, indicate that the unit of display parameters is " V " (volt).In addition, representative selects when VD8 is lighted
2T arc welding gun switch operation mode.When VD9 is lighted, representative has selected 4T arc welding gun switch operation mode.When VD11 is lighted, selection is represented
Gas Check(examines gas) operation.When VD11 is lighted, representative has selected Wire Check(to examine silk) operation.When VD1 is lighted, generation
Table has selected IND(inductance) parameter options.When VD2 is lighted, representative has selected SPEED(wire feed rate) parameter options；6) it realizes
The detection and output conversion and control of the real-time welding parameter of electric current, voltage.IDP represents actual current signal, from output electric current inspection
Slowdown monitoring circuit.UDP represents actual current signal, comes from output voltage detecting circuit.U2 microprocessor control system is given by detection
Fixed welding parameter, final output control parameter are respectively converted into the UgOUT voltage of analog quantity by respective conversion circuit
Given and IgOUT given value of current controls signal, the control for welding machine output characteristics；7) overheat and over-current detection and control are realized
System.When having detected overheat or overcurrent abnormal phenomenon, the OC terminal signals in attached drawing 5 are low level.Conversely, not occurring then
It is abnormal.Microprocessor control system judges whether welding machine occurs overheating or over-current phenomenon avoidance by detecting OC or ICS signal.If
There is exception, then can issue corresponding control signal, be controlled and shown accordingly.For example, the Tc connection CON8 in attached drawing 3 connects
The signal of mouth is heat alarm.CON8 interface is connected to the temperature relay of open type.And temperature relay be tightly attached to Q3~
Q7 IGBT or D7~D12 are exported on the aluminium alloy heat radiator of fast recovery diode.When temperature relay movement, show to lead
Superheating phenomenon occurs for power device.At this point, Tc current potential is pulled low to low level (GND) in attached drawing 8, meanwhile, control circuit will close
Close pwm signal PWM-STOP；The end OC/OT issue corresponding signal to Display panel and operation control interface, by display and
Operation control circuit detects and controls, and stops welding machine output or welding, prevents welding machine from burning out because of overheat.In cooling wind
Under the action of machine, after temperature dropped to a certain extent for aluminium alloy heat radiator, the superheating phenomenon of welding machine interior is eliminated, Thermal protection
When device restores, control circuit can just continue to output pwm control signal.Instruction is overheated simultaneously to eliminate.Which achieves welding machine overheats
Protection.
As shown in attached drawing 8.The pwm pulse bandwidth modulation signals of PWM-GD output are to determine welding machine inverter main circuit output electricity
The signal of pressure and size of current.Its pulse width depends on: 1) when manual welding, by welding current Setting signal Ig and output electricity
Feedback signal If+ etc. is flowed to codetermine.The object or target of control are output size of current.When unloaded, feedback signal very little.Control
Circuit processed generates the biggish PWM-GD pulse signal of a duty ratio, leads Q3 and Q7 and Q4 and two groups of IGBT of Q6 in maximum
Logical state, finally makes inverter main circuit output no-load voltage.When operator regulates Ig to constant current and welds, control
Circuit detects output electric current If+ feedback letter by exporting Hall current detection sensor (current sensor, 400A/4v)
Number.After U5A and its peripheral circuit processing, on the one hand, obtain welding current table by circuit conversion for " Current " and show
Output current signal, and realize the display of current digital display table.On the other hand, detect amplified current feedback signal with
Welding current gives Ig signal and is compared.Difference signal after comparing, by the electric current of the compositions such as rear class operational amplifier U6B
PI(proportional+integral) control circuit, the pulse width or duty of the result PWM-GD control welding machine output PWM chip of output
Than determining the size of welding machine output electric current and voltage, realizing accurately controlling for output current parameters.And make the output characteristics of welding machine
For the dropping characteristic dragged outside constant current band.Further say, when welding current give Ig signal it is constant when, with the electric current detected
It feeds back If+ signal to increase, and after reaching the setting value of given Ig, welding current Setting signal and current feedback control signal
Difference can with electric current increase and reduce, by control after, make welding machine output PWM-GD pulse width or duty ratio reduce, weldering
The output voltage of machine reduces.This process, that is, the control of so-called Current cut-off negative feedback.I.e. only when electric current reaches welding
The feedback control just to work after the setting value of current level device.Hereafter, the increase small with electric current, voltage reduces can very
It is more.When voltage drops to 16V or less, with the reduction of voltage, control circuit can make the pulse width of welding machine output PWM chip
Or duty ratio increases, and increases welding current according to the parameter of setting, ultimately forms the dropping characteristic dragged outside constant current band.Work as welding
When given value of current signal intensity, Current cut-off negative feedback setting value is different, but other control processes are similar.In this way,
Between the minimum and maximum of potentiometer setting, so that it may obtain without several negative characteristic curves.Such control is also to meet by hand
The basic demand of arc welding.2) when gas shield welding state of a control, Ug signal and output voltage feedback signal Uf+ are given by weldingvoltage
Deng co-determination.The object or target of control are output voltage sizes.Electricity is carried out using the circuit of the compositions such as operational amplifier U5C
Press negative-feedback PI control.It is similar with manual welding control when unloaded, it is still the biggish pwm pulse width signal of output, obtains empty
Carry voltage.It is after bringing onto load, then different with the control of manual welding.The output characteristics control of gas shield welding, welding machine is flat characteristic, and
It is not the dropping characteristic dragged outside constant current band.Its main feature is that: load current changes greatly, and output voltage varies less, and keeps phase
To stabilization.Only when voltage Setting signal changes, the voltage of output just will appear large change.The above control process,
It is to be realized by corresponding control circuit.As can be seen that changing the given value that inductance gives potentiometer from attached drawing 8, di/
Dtb and di/dta can change, this will affect PWM-GD signal, eventually change the characteristic of welding arc.
For there is the part of mot letter in attached drawing 3(figure) and attached drawing 6 wire feed and the control circuits part such as solenoid valve, come
It is+15V ,+24V voltage from the voltage of switching power circuit.Voltage rating be 24V wire feeding motor be connected to MOT+ and MOT- it
Between, wire feeding motor belongs to a component part of wire-feed motor in attached drawing 1.When having output voltage between two terminals of MOT+ and MOT-
When, the wire feeding motor operating of so far interface is connected, it can be achieved that wire feed controls.Otherwise, wire-feed motor not can rotate, will not wire feed.
SWA and SWB is that arc welding gun switch detects signal.When arc welding gun switch is unclamped or do not closed, voltage-stabiliser tube D19 breakdown, Q3 triode is led
Logical, the lumination of light emitting diode in optocoupler U2 chip, output stage triode ON makes GUN CHECK low level (GND electricity
It is flat).Conversely, GUN CHECK is high level when arc welding gun switch closes.GUN CHECK control signal is connected in attached drawing 4.It is attached
The microprocessor control system of Fig. 4 controls the level height of signal by detection GUN CHECK, that is, when may know that gas shield welding
Whether arc welding gun switch closes.It is pwm pulse width modulator that wire feed, which controls U4 chip, outer to be with many diodes, resistance
With the devices such as capacitor.8 and 11 foot output ends of U4 chip generate the square-wave pulse signal of fixed frequency.Frequency and dead time by
R46 and C33 is determined.8 feet of U4 chip and the pwm control signal of 11 feet output are after the circuit of the compositions such as D33 and D34, Q13
Remove control Q14 metal-oxide-semiconductor.By controlling the make-and-break time of Q14 metal-oxide-semiconductor, to control the revolving speed of wire feeding motor.PWM controls arteries and veins
The width of punching is determined by given wire feed rate value Ig.Change the i.e. changeable pulsewidth of the given size of Ig, final change is sent
The size of silk speed.That is, wire feed rate or current control when Ig represents gas shield welding.When gas shield welding is welded, when changing
When becoming the numerical value of Ig, wire feed rate or welding current are changed correspondingly.D37 diode group is freewheeling diode, eliminates wire feeding motor
Back-emf to the adverse effect of Q14.R58, Q2 metal-oxide-semiconductor and its control circuit constitute the dynamic braking control electricity of wire feeding motor
Road.SS/EN in attached drawing 6 is connected to the end SS in attached drawing 4.This is to realize " inspection silk " or " examination wire feed ", or manual or crawl
The control signal of wire feed.When the SS terminal signals in SS/EN or attached drawing 4 are high level, resistance is connected in the conducting of Q2 metal-oxide-semiconductor
R58 discharges the energy stored in machine winding quickly through R58, dynamic braking control is carried out to wire feeding motor, to make to send
Silk motor quickly stops operating, and stops wire feed.In this way, welding wire is just not to stretch out welding gun head gas shield cover too many, shadow
Ring the normal operating of welding.Conversely, Q2 metal-oxide-semiconductor is not turned on when the SS terminal signals in SS/EN or attached drawing 4 are low level.
Also, there is certain Ig given value, can thus wire feeding motor be made to rotate, carry out wire feed movement.When the welding machine output detected
For electric current in normal range (NR), the signal level of ICS terminal is+15V.Wire feed will not be controlled and be limited；When the weldering detected
Machine output electric current is excessive, and when beyond setting limit value, the signal level of ICS terminal is low level -15V.At this point, wire feeding motor can be made
It stops operating, without wire feed.Which achieves the protections to welding machine.In attached drawing 6, electromagnetic gas valve is connected to GAS and GND two
End.GAS/EN is connected to the end SQ in attached drawing 4.This is that supplying gas for solenoid valve of control controls signal.When the control at the end GAS/EN or SQ
When level processed is high, Q9 conducting, voltage-stabiliser tube D18 can puncture, pressure stabilizing, and Q8 is connected, and the electromagnetic gas valve for being connected to the port GAS is dynamic
Make.Conversely, then closing electromagnetic gas valve.This achieves that the switching control of protection gas.
In attached drawing 6, when gas shield welding, by detecting GUN CHECK arc welding gun switch level signal, and combine SS/EN or SS,
GAS/EN or SQ, Ig and ICS signal, so that it may the control such as realization supplies gas, wire feed and welding process.It supplies gas, wire feed and given value of current
The control of Ig signal also has close relationship with the 2T/4T state control signal in attached drawing 4.It is further described below.
Referring to attached drawing 6 and attached drawing 4.MIG gas shield welding and 2T welding gun mode of operation are selected, when arc welding gun switch SWA and SWB close
When, GUN CHECK is high level.On the one hand, make the SQ signal high level in GAS/EN or attached drawing 4.Q9 conducting, voltage-stabiliser tube
D18 breakdown, pressure stabilizing, the conducting of Q8 field-effect tube, GAS terminal connection+24V, electromagnetic gas valve movement can be such that protective gas is transported to
It is protected the welding section of welding gun end.On the other hand, due to there is wire feed to give Ig signal, in U4 chip TL494 and its periphery
Under the action of circuit, the square-wave pulse pwm control signal of the 8 and 11 feet output of U4 chip TL494 is by D33 and D34, Q13 etc.
Control Q14 metal-oxide-semiconductor is removed after the circuit of composition.By controlling the switching time of Q14 metal-oxide-semiconductor, to control turning for wire feeding motor
Speed drives welding wire to be sent into.Later, electric arc is ignited, and welding process starts to carry out.In welding process, PWM controls the width of pulse
It is to be determined by given wire feed rate value Ig.Change the i.e. changeable pulsewidth of given size, it is final to change the big of wire feed rate
It is small.Actually change the size of welding current.After unclamping arc welding gun switch, the SS terminal signals in SS/EN or attached drawing 4 become
When for high level, the conducting of Q2 metal-oxide-semiconductor connects resistance R58, discharges the energy stored in machine winding quickly through R58, right
Wire feeding motor carries out dynamic braking control, so that wire feeding motor be made quickly to stop operating, stops wire feed.In this way, welding wire just will not
In that can stretch out, welding gun head gas shield cover is too many, influences the normal operating of welding.Meanwhile making GAS/EN or (in attached drawing 4) SQ
Become low level, Q9 ends or is not turned on, and voltage-stabiliser tube D18 will not puncture, pressure stabilizing, and Q8 field-effect tube is not turned on, and GAS terminal will not
Connection+24V, electromagnetic gas valve are failure to actuate, and protective gas can not convey.
Referring to attached drawing 6 and attached drawing 4.When selecting MIG gas shield welding and 4T welding gun mode of operation, as arc welding gun switch SWA and SWB
When closing, GUN CHECK is high level.On the one hand, make the SQ signal high level in GAS/EN or attached drawing 4.Q9 conducting, pressure stabilizing
Pipe D18 breakdown, pressure stabilizing, the conducting of Q8 field-effect tube, GAS terminal connection+24V, electromagnetic gas valve movement make protective gas be transported to weldering
Area is met to be protected.On the other hand, due to there is wire feed to give Ig signal, under the action of U4 chip TL494 and its peripheral circuit,
The square-wave pulse pwm control signal of the 8 and 11 feet output of U4 chip TL494 removes control Q14 metal-oxide-semiconductor.By controlling Q14 MOS
The switching time of pipe drives welding wire to be sent into control the revolving speed of wire feeding motor.Later, electric arc is ignited, and welding process is opened
Begin to carry out.After unclamping arc welding gun switch, although GUN CHECK signal becomes low level, the SQ in GAS/EN or attached drawing 4
Signal is still high level, and electromagnetic gas valve continues holding movement, conveys protective gas to welding section.Meanwhile still there is wire feed given
Ig signal, and wire feed is kept at the control.In welding process, change the i.e. changeable wire feed rate of size or welding of given Ig
The size of electric current.Welding process still will do it.When arc welding gun switch SWA and SWB close again, GUN CHECK becomes high electricity
It is flat.It supplies gas and continues to keep with wire feed and welding process.After unclamping arc welding gun switch again, GUN CHECK signal becomes low level.
Ig signal is closed, and stops wire feed.Meanwhile the Q2 in attached drawing 6 can be connected, and be sent into welding wire and carry out dynamic braking control.GAS/
SQ signal in EN or attached drawing 4 becomes low level, Q9 cut-off.Q8 will not end immediately, because having the presence of capacitor C27, capacitor
C27 can be gradually discharged, and the electromagnetic gas valve being connected between GAS and ground lag will also closed, to realize that lag is held one's breath control
System.Finally, protective gas stops conveying.Welding process terminates.
See attached drawing 6 and attached drawing 4." inspection silk " or " examination wire feed ", or manually or the control of crawl wire feed: when having selected control plane
MIG on plate, that is, MIG/MAG gas shield welding, and when " inspection silk " pressed on front display and operation control panel or " examination is given
When " inspection silk " or " examination wire feed " key K2 in key, that is, attached drawing 4 of silk ", SS/EN or (in attached drawing 4) SS export low level
Signal, with progress " inspection silk " or " examination wire feed " operation control.At this point, the field-effect tube Q2 in attached drawing 6 is not turned on, wire feeding motor
Energy-dissipating brake circuit disconnects.Meanwhile GAS/EN or (in attached drawing 4) SQ is low level, is not turned on Q9, voltage-stabiliser tube D18 will not be hit
It wears, pressure stabilizing, Q8 field-effect tube is not turned on, and GAS terminal is not turned on+24V, and electromagnetic gas valve is failure to actuate, and protective gas can not convey.
At the same time, certain wire feed gives the IN input terminal that setting value Ig is input to U4 TL494, in U4 TL494 and its periphery
Under the action of circuit, 8 and 11 feet of U4 TL494 export certain square-wave pulse pwm control signal, by D33 and D34, Q13
Control Q14 metal-oxide-semiconductor is removed after the circuit of equal compositions.By control Q14 metal-oxide-semiconductor make-and-break time, thus make wire feeding motor according to
The control rotational speed of setting drives welding wire to be sent into.To realize crawl wire feed process control.The operation of crawl wire feed can make welding wire
Certain length, about 10mm or so are stretched out from welding gun head.During crawl wire feed, solenoid valve is failure to actuate, and welding machine is not yet
Output voltage or electric current.The control of crawl wire feed is primarily to facilitate user installation welding wire into welding gun.The speed of crawl wire feed is not
It is cracking, because of too fast wire feed, it is not easy to the installation of welding wire.In general, there are many wire feed rate when being less than welding.
For the invention patent, in the case where selecting MIG/MAG gas shielded welding method, selectable welding parameter has:
Gage of wire, inductance are finely tuned weldingvoltage and are returned and burn the time.1) gage of wire parameter has tri- kinds of 0.6,0.8 and 1.0mm.It is different
Wire feed rate given value will affect wire-feeding control circuit PWM signal output.That is, the revolving speed of wire feeding motor can be made to send out
It is raw to change.It is well known that thin wire melting is fast, it is desirable that wire feed rate it is also larger therewith.Conversely, thick wire melting
Slowly, wire feed rate is just accordingly slow.The selection of gage of wire controls, the circuit exactly set to meet above-mentioned requirements,
It is a kind of good control mode for better conforming to thickness wire bond connection control circuit.User's welding is also convenient for operate with.2) electric
Sense parameter can select between 1~8.The change of inductance parameters will affect arc characteristic when gas shield welding welding, to can change
Welding process, stability, splashing size and appearance of weld etc..3) fine tuning weldingvoltage can change between ± the 5V of standard value.
Weldingvoltage and welding current or wire feed rate are set using unified regulative mode, i.e. change wire feed rate or welding electricity
Stream, corresponding weldingvoltage standard value can change correspondingly.And weldingvoltage is finely tuned, it can play on the basis of standard value, into
The effect that row increases or decreases.User is also beneficial to according to actual welding condition, welding parameters carry out adjustment appropriate.4)
Returning burning time parameter can change between 0~1S.The size for burning the time is returned, the control shape that welding machine gas shield welding receives the arc stage can be changed
State.The time is burnt in different returning, can be to the stage that welding process terminates fastly, that is, receives the weld seam arc crater filling in arc stage, welding wire
Head goes bead, arc re-ignition etc. to have an impact.In short, the change of above-mentioned parameter, control circuit can be by adjusting wire feed control
The pwm signal of circuit processed and the pwm signal of welding machine output characteristics and driving circuit, the final wire feed rate for changing welding machine are (practical
On be exactly to change welding current), output voltage etc. change arc characteristic, finally realize different welding processes.
It is the brief control process explanation of each circuit board section of the invention and three kinds of welding methods above.Because illustrating that circuit is former
It manages more complicated.The thought and result of control are only provided above.But since the present invention has given detailed circuit schematic diagram,
For having for the people of circuit reading ability (or having interlock circuit knowledge), can understand completely.Circuit diagram is also one
The noiseless language of kind.But for not having for the people of circuit reading ability (or not having interlock circuit knowledge), even if explain
More again, they are also elusive.In view of the relationship of length, patent specification can only illustrate main part, so that specially
Sharp specification reader better understood when relevant working principle and process.It is controlled about others, everybody can combine
Circuit diagram is analyzed and is understood.
By above description as it can be seen that the present invention has oneself unique mentality of designing and method.Welding machine power supply be 220~
240V, frequency are 50 or 60Hz.The controls such as three kinds of welding methods output of welding machine can be not only realized, moreover, designed control
The design of the structure of circuit and welding machine is all that welding machine product of the present invention is made to have the technologies such as control performance is good, machine structure is compact
Where the basic reason of advantage, and meet the production of product high efficiency and low cost, high reliability, manufacturing process technology advance
Important leverage.The content of present patent application protection is that the structure and circuit for protecting this welding machine.
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 (4)
1. a kind of IGBT inversion multifunctional welding machine, it is characterised in that: welding machine interior is in left and right layout structure, logical in welding machine interior
Middle partition is crossed to separate internal mechanical part and the master board part of welding machine；Wire-feeding part is arranged in left side side；Wire-feeding part
Welding wire dish axle is mounted on the middle partition of welding machine interior；Wire feeder is mounted on bottom plate, close to welding machine front panel, and with it is preceding
European gas shield welding welding gun seat on panel links together；Master board, cooling blower and reactor are arranged in the right other side；Weldering
It is equipped on the front panel of machine: European welding gun interface module copperhead, black output quick coupling holder assembly, the red fast quick access of output
Header elements and operation and charactron display control panel；Power switch, band plug power supply are installed on welding machine rear panel
Line, cooling blower and protection gas suction nozzle and electromagnetic gas valve；For the master board circuit part of welding machine, board design two
Block is operation and charactron display control circuit plate and master board respectively.
2. a kind of IGBT inversion multifunctional welding machine as described in claim 1, it is characterised in that: the operation and charactron is aobvious
Show that control circuit board part is attached by other circuit parts of plug and welding machine；The partial circuit is mainly by micro process
Device, two common-anode charactrons, inspection gas and inspection silk key, argon arc welding/three kinds of manual welding/gas shield welding welding method selection key,
2T/4T arc welding gun switch operation mode and VRD function selection key, parameter options key, parameter regulation encoder, control supply gas and
Two optocouplers, overheat or the over-current detection and control circuit of wire feed, inductance parameters adjusting control circuit, voltage detecting circuit, electricity
Current detection circuit, output voltage conversion circuit, output current converter circuit, output voltage conversion circuit are grouped as；In Wei Chu
Under the control for managing device control system, according to the user's choice and the state whether welded, when can show manual welding and argon arc welding
Welding current；Welding current or wire feed rate and voltage when can show gas shield welding；Can light manual welding, argon arc welding, gas shield welding,
2T, 4T, VRD, inspection gas, the corresponding light emitting diode of inspection silk option；Microprocessor control system is joined by detecting given welding
Number, final output control parameter, the conversion circuit through overcurrent, voltage, the voltage for being respectively converted into analog quantity gives and electric current
Given control signal, the control for welding machine output characteristics；Microprocessor control system passes through detection OC or ICS signal, judgement
Whether welding machine occurs overheating or over-current phenomenon avoidance；When temperature relay movement, control circuit will close pwm signal；The end OC/OT hair
Corresponding signal is to Display panel and operation control interface out, by showing and operation control circuit detects and controls, stops
Only welding machine output or welding, prevent welding machine from burning out because of overheat；Under the action of cooling blower, when aluminium alloy heat radiator
After temperature dropped to a certain extent, the superheating phenomenon of welding machine interior is eliminated, and when thermal protector restores, control circuit could continue defeated
Pwm control signal out.
3. a kind of IGBT inversion multifunctional welding machine as described in claim 1, it is characterised in that: the wire-feeding part includes gas
In welding wire dish axle (9), wire feeder (6), European gas shield welding welding gun interface copperhead (5) and master board when body protection weldering
Wire-feeding control circuit part；Wire feeder (6) and wire feed dish axle (9) are mounted on partition in inside (10)；Wire feeder (6) leans on
Nearly welding machine front panel (24), the European gas shield welding welding gun interface copperhead (5) installed on wire feeder (6) and front panel (24) carry out
Corresponding connection；When protecting weldering, gas shield welding welding gun and European gas shield welding welding gun interface copperhead (5) are cooperatively connected, and welding wire is installed to weldering
On wire tray axis (9), it can be sent to wire feeder (6) after welding wire installation, then conveyed by European gas shield welding welding gun interface copperhead (5)
To the welding gun head being attached thereto, by the wire feed rolls and contact roller of wire feeder (6), under the control of circuit, welding wire can be made
It is stretched out from the ignition tip of gas shield welding welding gun, when gas shield welding, the wire feed rate of welding wire is size-controlled in circuit board and corresponding current potential
Device control adjusts the size that wire feed rate is changeable welding current, the protection gas on European gas shield welding welding gun interface copperhead (5)
Body interface is connected to electromagnetic gas valve (15) by a tracheae, and protective gas is linked into the gas of electromagnetic gas valve (15) outside welding machine
Body input port under the control action of welder circuit, can make electromagnetic gas valve (15) switching, to make to protect after opening gas cylinder
Gas accesses welding gun, and flows out from welding gun head, realizes the metal coating to welding section；When manual welding, then not to wire-feeding part
It is controlled.
4. a kind of IGBT inversion multifunctional welding machine as described in claim 1, it is characterised in that: the master board include by
Input filter circuit powers on buffer circuit, input rectifying and filter circuit, inverter main circuit, switching power circuit, inversion PWM
With IGBT drive control circuit, wire feed and solenoid valve control circuit and output characteristics control circuit；
220V~240V input supply voltage is connected to power supply switch S1, is connect by the power switch S1 on welding machine rear panel
Energization network source, using the input filter circuit being made of resistance, capacitor, the main function of the circuit is to reduce electric network source
Interference to inverter welder circuit improves the functional reliability of welding machine；
Input AC electricity thermistor, relay K1 and field-effect tube Q1, diode D2, voltage-stabiliser tube D3 component by being made of
Power on buffer circuit part after, then after rectified device DB1 rectification become Rectified alternating current, and carry out to C8 ~ C9 electrolytic capacitor
Charging, voltage gradually rise, and eventually become relatively stable high voltage direct current；
It is rectified by rectifier (30), after electrolytic capacitor filtering, on the one hand the high voltage direct current of acquisition is supplied by capacitor and four
IGBT pipe, inversion main transformer and fast recovery diode, output current filter reactor or inductance, output Hall current detection
The inverter main circuit of sensor composition；High voltage dc bus voltage is converted to medium frequency alternating current, inversion main transformer by inverter main circuit
Depressor realizes the transformation of voltage step-down and High-current output, and fast recovery diode is then that the intermediate frequency of contravariant transformer output is handed over
Galvanic electricity is transformed to direct current, its transformed current waveform is pulsation, the unstable stabilization for being unfavorable for welding process, using L2
Output current filter reactor or inductance are filtered, and the current waveform exported in this way will become stable, and help to obtain height
The weld seam of quality；
High voltage dc bus voltage supply switching power circuit, switch power supply route switching mode power supply transformer, metal-oxide-semiconductor, quickly
Diode, integrated pwm circuit and integrated regulator and resistance, capacitor element composition around them, switching power circuit produce
Raw+5V ,+15V ,+24V, -15V supply voltage, supply the live line works such as other corresponding control circuits；
Driving transformer, integrated PWM chip and surrounding diode, voltage-stabiliser tube, resistance, capacitor and IGBT pipe inversion PWM
With IGBT drive control circuit part, integrated PWM chip chip output pwm signal driving power is small, needs by drive control
Circuit carries out power amplification, then the on-off working condition of control IGBT pipe is gone by driving transformer；Integrated PWM chip output
Control signal is two groups of PWM square-wave pulse signals, the frequency of square wave be it is fixed, two groups of square-wave pulse signals have in time
One regular time is poor, and dead time is also referred to as in profession, it is the important parameter for ensureing two groups of switches of IGBT and working alternatively,
The time is the peripheral components parameter setting determination by chip, and the pwm pulse bandwidth modulation signals of chip output are to determine
Determine the signal of welding machine inverter main circuit output voltage and size of current, its pulse width depends on manual welding (MMA) and controls shape
When state, codetermined by welding current Setting signal and output current feedback signal；The object or target of control are output electric currents
Size；When unloaded, feedback signal very little；Control circuit generates a biggish pwm pulse signal of duty ratio, makes at two groups of IGBT
In alternating conductive state, on the other hand, the current signal detected is born by processing such as signal amplifications, and in this, as electric current
Feedback control signal is compared with welding current Setting signal, and the difference signal after comparing carries out ratio and integral adjustment control
System, the pulse width or duty ratio of the result control welding machine output PWM chip of output, decision welding machine output electric current and voltage
Size realizes accurately controlling for output current parameters；
The output characteristics control circuit passes through signal enhanced processing, and in this, as current feedback control signal, with weldering
It connects given value of current signal to be compared, the difference signal after comparing, carries out ratio and integral adjustment control, the result control of output
The pulse width or duty ratio of welding machine output PWM chip processed, determine the size of welding machine output electric current and voltage, realize output electric current
Parameter accurately controls；And the dropping characteristic for dragging the output characteristics constant current band of welding machine outside；It further says, works as welding current
When Setting signal is constant, the electric current detected with welder circuit increases, also, after reaching given setting value, welding current
The difference of Setting signal and current feedback control signal can increase with electric current and be reduced, and after ratio and integration control, make
Welding machine exports the pulse width of PWM chip or duty ratio reduces, and the output voltage of welding machine reduces, this process, that is, so-called
Current cut-off negative feedback control；The feedback control only just worked after electric current reaches the setting value of welding current potentiometer
System；, with the small increase of electric current, voltage reduces can be very much；When voltage drops to 16V or less, with the reduction of voltage, control
Circuit processed can be such that the pulse width of welding machine output PWM chip or duty ratio increases, and increase welding current according to the parameter of setting,
Ultimately form the dropping characteristic dragged outside constant current band；Load current changes greatly, and output voltage varies less, and keeps relatively steady
It is fixed；Only when voltage Setting signal changes, the voltage of output just will appear large change, and the above control process is logical
Corresponding control circuit is crossed to realize.
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