CN205496752U - Structure of multi -functional three -phase 380V single tube IGBT contravariant welding machine - Google Patents

Abstract

The utility model relates to a structure of multi -functional three -phase 380V single tube IGBT contravariant welding machine, the power supply of welding machine is three -phase 380V, adopts single tube IGBT half -bridge contravariant control, except MIGMAG gas shielded arc welding, can also carry out the manual electric arc welding, can carry out simple and easy argon arc and weld, the utility model discloses a show and operation control panel that the design has 6 charactrons and shows control circuit on its board, be divided into two sets ofly, show electric current and voltage parameter respectively, in addition manual welding / gas is protected and is welded method switching button, gas is protected and is welded 2T4T welder on -off operation mode selector button, voltage, electric current and send the unit pilot lamp of a speed, overheated pilot lamp to and electric current, voltage and electron reactor inductance set for the regulator potentiometer, the utility model discloses the welding machine, not only welding method is multi -functional, has solved single function welding machine and has used the narrow problem of face, and electrical circuitry, circuit board and the the whole structure design of welding machine have the unique part of oneself moreover.

Description

A kind of structure of Multifunctional three-phase 380V single tube IGBT inverter type welder

Technical field

This utility model relates to the structure of a kind of Multifunctional three-phase 380V single tube IGBT inverter type welder, the power supply of welding machine For three-phase 380V, use single tube IGBT semi-bridge inversion to control, belong to inverter type welder technical field.

Technical background

At present, the competition in contravariant MIG/MAG gas shielded welding machine product market is the fiercest, is not only embodied in technology Advanced with in advantage, also depend greatly on circuit and the aspect such as function and structure design thereof of welding machine.

On domestic and international market, the rated current of the IGBT contravariant MIG/MAG gas shielded welding machine of three-phase 380V generally exists 350 ~ 630A(cyclic duration factor 60%) level.This type of welding machine product most is all the MIG/ using IGBT module inversion MAG gas shielded welding machine, has unifunctional, also has band manual welding function.Its cost and selling price are high, and market sale can be subject to To certain restriction.

For multi-functional, the gas shield welding machine of the function such as manual electric arc welding, argon arc welding the most also can be used, due to it Adaptability is higher, thus the scope of its application can be wider.Production marketing can be more added with the market competitiveness.But, this type of welding machine, no Same circuit, circuit board and complete machine structure design, control principle is different with mode, circuit board and the layout of complete machine and connection side Formula, or the complexity connected is different, and the operation of its production and processing technology etc. are the most entirely different.These all can affect The production of product and cost of transportation.Therefore, how on the premise of low cost, developing multi-functional welding machine is to have certain technology difficult Degree.This is also the problem that this utility model needs to solve.

Utility model content

The purpose of this utility model is to provide the structure of a kind of Multifunctional three-phase 380V single tube IGBT inverter type welder, welding machine Power supply be three-phase 380V, use single tube IGBT semi-bridge inversion control, in addition to MIG/MAG gas shielded arc welding, it is also possible to Carry out manual electric arc welding, meanwhile, utilize manual welding function, it is also possible to carry out simple argon arc welding；Welding machine output rated current up to 250A/27V(40%), 270A/28V(35%) etc.；This utility model welding machine, not only welding method is multi-functional, solves single merit The problem that energy welding machine application surface is narrow, and the circuit theory of welding machine, circuit board and complete machine structure are designed with the unique distinction of oneself.

The most by the following technical solutions:

The structure of a kind of Multifunctional three-phase 380V single tube IGBT inverter type welder, welding machine mainly includes housing, front panel, below Plate, base plate, wire-feeding part and panel, it is characterised in that: described wire-feeding part includes: wire reel during gas shielded arc welding Axle, wire feeder, European gas shield welding welding gun interface and wire-feeding control circuit part, wire feeder and wire feeding disc axle are arranged on dividing plate On, wire feeder carries out phase near the front panel of welding machine, wire feeder with the European gas shield welding welding gun interface of installation on front panel The connection answered, during gas shield welding, gas shield welding welding gun is connected with European gas shield welding welding gun Interference fit, and welding wire is arranged on wire reel axle On, the protective gas interface on European gas shield welding welding gun interface is connected to electromagnetic gas valve by a trachea, and protective gas is from weldering The gas input port of electromagnetic gas valve it is linked into outside machine；Described panel includes power on buffer circuit, input rectifying and filtering Circuit, four single tube IGBT and inversion main transformer and the inverter main circuit of the output composition such as rectification, filtering thereof；Switch power supply Road；The control circuits such as inversion PWM and IGBT driving；The control circuit such as wire feed and electromagnetic valve；Output characteristics control circuit；Welding machine is grasped Make and display control circuit.

It is provided with on described rear board: on and off switch, power supply line, wire fixer, cooling fan, the gas of protection gas connect Head or suction nozzle and electromagnetic gas valve, grounding screw；It is provided with on described front panel: European welding gun interface module, black export Snap joint holder assembly, red output snap joint holder assembly, operation and display control panel, manual welding electric current and gas shield welding are sent Silk speed regulator potentiometer, gas shield welding voltage-regulation potentiometer, adjustment of inductance potentiometer；In operation and display control panel, It is designed with manual welding and electrogas process switching button and status indicator lamp, gas shield welding arc welding gun switch 2T or 4T pattern turn Change button and status indicator lamp, overtemperature protection status indicator lamp, manual welding electric current and gas shield welding wire feed rate adjusting knob, gas Protect weldering voltage-regulation knob, adjustment of inductance knob.

Operation and display control circuit use the control circuit of two panels GC7139C chip composition, control respectively often to organize 3 Ammeter and the voltmeter of the compositions such as charactron, coordinates other control circuit, charactron can show preset or actual weldering respectively The standard parameter connect；Use the control circuit of two panels CD4013 chip composition, respectively constitute manual welding/gas shielded welding method select, Gas shield welding 2T/4T arc welding gun switch mode of operation selects control circuit.

Additionally, be also devised with manual welding and gas shielded welding method switching button and status indicator lamp, gas shield welding arc welding gun switch 2T/4T patten transformation button and status indicator lamp, overtemperature protection status indicator lamp, manual welding electric current and gas shield welding wire feed rate The circuit parts such as regulator potentiometer, gas shield welding voltage-regulation potentiometer, adjustment of inductance potentiometer.Welding method is by corresponding instruction Lamp indicates its state；2T/4T pattern is indicated its state by corresponding display lamp.Overtemperature protection status indicator lamp yellow or redness are then Whether instruction superheat state occurs.Electric current or wire feed rate, voltage parameter also have corresponding display lamp to carry out state instruction, welding The parameter of method uses corresponding potentiometer to be adjusted.

Two-sided layout, a small amount of large-sized device layout is used in front, to rely primarily on manual work mode on panel Complete assembling and welding, and substantial amounts of electronics surface-mounted device layout is at the back side of large circuit board, is processed according to automated manner；Should Circuit on circuit board, is divided by function, is designed with: by the buffer circuit that powers on, input rectifying and filter circuit, four single tubes The inverter main circuit that IGBT and inversion main transformer and output rectification, filtering etc. form；Switching power circuit；Inversion PWM and The control circuits such as IGBT driving；The control circuit such as wire feed and electromagnetic valve；Output characteristics control circuit；Welding machine operation and display control Circuit.

The parts installed on described rear board mainly have: on and off switch, band plug power supply line, cooling wind Machine, the protection part such as gas suction nozzle and electromagnetic gas valve, welding machine grounding screw and mark, cold wind is from the air inlet at welding machine case rear portion Enter, some heater members or parts on circuit board can be made to have good cooling effect, such air channel and the type of cooling to set Meter, is also one of this utility model welding machine major reason of realizing larger current and high capacity water holdup.

For master board circuit part, board design is one block of big plate, the two-sided layout of electronic devices and components.Controlling electricity Road aspect, is divided by function, is designed with: by the buffer circuit that powers on, input rectifying and filter circuit, four single tube IGBT and inversion Main transformer and the inverter main circuit of the output composition such as rectification, filtering thereof；Switching power circuit；Inversion PWM and IGBT driving etc. Control circuit；The control circuit such as wire feed and electromagnetic valve；Output characteristics control circuit；Welding machine operation and display control circuit interface and Its corresponding circuit.Between each circuit, link together according to circuit theory diagrams relation of the present utility model.Three kinds of welderings can be met Connect control requirement and the state instruction of method.Such as, 1) power and energy and the state of manual welding (containing argon arc welding)/gas shield welding refers to Show；2) manual welding (containing argon arc welding) output characteristics and parameter shows and state instruction etc. controls；3) the crawl wire feed of gas shield welding Control；Arc welding gun switch 2T or 4T patten transformation control and state instruction；Preflow, delayed time control of holding one's breath；And it is flat special Property output, voltage and wire feed rate regulation etc. control function and Parameter units instruction etc..Additionally, of the present utility model each controls Circuit devcie major design layout is on one piece of large circuit board.More large-sized device is by automatic and a small amount of artificial plug-in unit Mode, be arranged on the one side of this circuit board, a lot of undersized devices are then to be mounted directly by the way of automatic chip mounting With the another side being welded on this circuit board.Thus the production process of device can be simplified, reduce manufacturing cost.Unlike other The welding machine design of multi circuit board structure like that, has a lot of connection control lines between its circuit board, production operation is many and raw Production. art is complicated, and circuit board also takes up bigger space, makes package size big, Heavy Weight.It is to say, use this practicality Novel design philosophy and mode reduce product size, reduce weight and cost of transportation.Meanwhile, few because controlling line, welding machine Production and processing operation reduces, and processing technology have also been obtained simplification, convenient production.

This utility model welding machine requiring different current classes and cyclic duration factor, can be a small amount of by adjusting on circuit board Parts specifications parameter, form difference output rated current and the product of cyclic duration factor, make product seriation.Such as, change Become current class and the heat sink size of IGBT device；Change model and the parameter of fast recovery diode；Change inversion main transformer Depressor and the specification of output filter reactor and parameter etc., can easily form the series of products of different size.Such as 250A/27V (40%), 270A/28V(35%) etc. multiple current class and the product of specifications and models.Certainly, these changes, it is therefore an objective to make product Specifications parameter and the performance indications of cost of manufacture and corresponding machine match.So, the welding machine of every kind of specifications and models could be real Existing optimized cost control.This just improves the market competitiveness of institute's development.

This utility model welding machine, owing to having the use function of multiple welding method, solves the application of simple function welding machine The problem that face is narrow, thus have more preferable adaptability than the welding machine of simple function.Its good circuit and structure design thereof are also these The advantage place of utility model, is also to meet efficiently and low-cost production, high reliability, the important guarantor of manufacturing technology advance Barrier.The circuit theory of this utility model welding machine, circuit board and complete machine structure are designed with the unique distinction of oneself.

Accompanying drawing explanation

Accompanying drawing 1 is structural representation of the present utility model；

Accompanying drawing 2 is the schematic block circuit diagram of this utility model welding machine；

Accompanying drawing 3 is operation and display control circuit schematic diagram () of this utility model welding machine；

Accompanying drawing 4 is operation and display control circuit schematic diagram (two) of this utility model welding machine；

Accompanying drawing 5 is the switching power circuit schematic diagram of this utility model welding machine；

Accompanying drawing 6 is the control circuit schematic diagrams such as inversion PWM and the IGBT driving of this utility model welding machine；

Accompanying drawing 7 is the control circuit schematic diagrams such as wire feed and the electromagnetic valve of this utility model welding machine；

Accompanying drawing 8 is output characteristics control circuit schematic diagram () of this utility model welding machine；

Accompanying drawing 9 is output characteristics control circuit schematic diagram (two) of this utility model welding machine；

Accompanying drawing 10 is output characteristics control circuit schematic diagram (three) of this utility model welding machine；

Accompanying drawing 11 is output characteristics control circuit schematic diagram (four) of this utility model welding machine；

In accompanying drawing, each component names is as follows: 1, screw；2, cover；3, knocker；4, screw；5, wire feeding disc axle；6, handle；7、 Screw；8, plate washer；9, wire-feed motor；10, insulation board；11, dividing plate；12, main transformer；13, master control borad；14, transformator；15, become Depressor；16, fin；17, insulation board is levied in heat radiation；18, grounding screw；19, empty spending frame；20, gas cylinder adds thermal socket；21, empty Open；22, wire fixer；23, power line；24, screw；25, blower fan guard；26, back plate；27, air valve；28, brachium pontis electric capacity；29, inverse Become plate；30, fin；31, heat radiation is levied；32, support；33, fin fixed insulation plate；34, support；35, screw；36, input Reactance；37, output reactance；38, display circuit board；39, side cover；40, electric former regulator potentiometer；41, voltage-regulation potentiometer； 42, adjustment of inductance potentiometer；43, screw；44, gas shield welding copperhead；45, European plugs；46, European plugs；47, screw；48, gas Bottle heater circuit plate；49, heating plate and bottom plate fixing structure part；50, base plate；51, at the bottom of machine；52, end pearl.

Detailed description of the invention

As shown in figures 1-8, the structure key component of a kind of Multifunctional three-phase 380V single tube IGBT inverter type welder includes: 1) wire-feeding part.Wire reel axle (5) when specifically including that gas shielded arc welding, wire feeder (9), European gas shield welding welding gun connect Mouth copperhead (44) and wire-feeding control circuit part.Wire feeder (9) and wire feeding disc axle (5) are arranged on internal partition (11).Send Silk mechanism (9) is near welding machine front panel (47).Wire feeder (9) the European gas shield welding welding gun interface installed upper with front panel (47) (44) connect accordingly.During gas shield welding, gas shield welding welding gun is connected with European gas shield welding welding gun interface (44).(15 or 20Kg) welding wire is installed on wire reel axle (5).Welding wire can be sent to wire feeder (9) after installing.Welded by European gas shield welding again Rifle interface (44) is transported to the welding gun head being attached thereto.By wire feed rolls and the contact roller of wire feeder (9), in the control of circuit Under system, welding wire can be made to stretch out from the ignition tip of gas shield welding welding gun.During gas shield welding, the wire feed rate of welding wire is size-controlled in circuit board Control with corresponding potentiometer.Regulation wire feed rate can change the size of welding current.European gas shield welding welding gun interface (44) On protective gas interface be connected to electromagnetic gas valve (27) by a trachea.Protective gas is linked into electromagnetism gas outside welding machine The gas input port of valve (27).After opening gas cylinder, under the control action of welder circuit, electromagnetic gas valve (27) switching can be made, So that protective gas accesses welding gun, and flow out from welding gun head, it is achieved the metal coating to weld zone.During manual welding, the most not Wire-feeding part and electromagnetic gas valve are controlled.

2) housing portion.Including shell screw (1), cover (2), handle (6), side cover plate (39), back plate (26), header board (47), base plate (51) etc..

3) rear board part.The parts installed on this rear board mainly have: on and off switch (21), power supply line (23), power line cannot not draw de-ly (also referred to as wire fixer, 22), cooling fan, the gas joint of protection gas or suction nozzle and electromagnetic gas valve (27), the part such as grounding screw (18).Power line (23) is connected to power supply grid.On and off switch (21) controls the logical of welding machine electric power Or it is disconnected.Cooling some parts within fan butt welding machine carry out forced air cooling.Cooling fan is positioned at the rear portion of welding machine, cold wind from The air inlet at welding machine case rear board rear portion is carried out.Some heater members or parts can be made, as IGBT and Heat Sink A heat sink, The parts such as fast recovery diode and radiator are preferably cooled down.Such air channel and type of cooling design, be conducive to Ensure the reliability of welder circuit work, be also that this utility model welding machine realizes the important former of larger current and high capacity water holdup One of because of.

4) front-facing portion.The parts installed mainly have: European welding gun interface module (44), black output snap joint Holder assembly (46), red output snap joint holder assembly (45), operation and display control panel (38), (manual welding) electric current and (gas shield welding) wire feed rate regulator potentiometer (40), (gas shield welding) voltage-regulation potentiometer (41), adjustment of inductance potentiometer (42). In operation and display control panel (38), it is designed with manual welding and electrogas process switching button and state instruction thereof Lamp, gas shield welding arc welding gun switch 2T or 4T patten transformation button and status indicator lamp, overtemperature protection status indicator lamp, (manual welding) The parts such as electric current and (gas shield welding) wire feed rate adjusting knob, (gas shield welding) voltage-regulation knob, adjustment of inductance knob.

5) bottom parts.Callosity (52) containing welding machine, support (32,34) etc..

6) panel (13).Including by the buffer circuit that powers on, input rectifying and filter circuit, four single tube IGBT and inversion Main transformer and the inverter main circuit of the output composition such as rectification, filtering thereof；Switching power circuit；Inversion PWM and IGBT driving etc. Control circuit；The control circuit such as wire feed and electromagnetic valve；Output characteristics control circuit；Welding machine operation and display control circuit interface and Its corresponding circuit.Between each circuit, link together according to circuit theory diagrams relation of the present utility model.Manual welding can be met Every control requirement of (containing argon arc welding) and MIG/MAG gas shield welding method.Physical circuit and parts thereof are shown in relevant Accompanying drawing schematic diagram etc. shown in.

This utility model welding machine, during manual electric arc welding, two groups of outputs snap joint holder assembly (45,46) are for connecting respectively Welding clamp cable and workpiece clamp cable.Polarity during connection can be according to the kind of welding rod and the mode requiring decision connection.Red Color, represents positive output；Black, represents negative output；During gas shield welding, welding gun is connected to European welding gun interface module (44).Black exports Snap joint holder assembly (46) is generally used for connecting workpiece clamp welding cable.This connected mode is referred to as reversal connection or reversed polarity connects Connect.

This utility model welding machine, crawl wire feed switch SW2 is crawl wire feed control knob, is arranged near wire feeder, Under the effect of control circuit, welding wire is realized slowly or intermittent feed, it is simple to welding wire is installed and is allowed to from welding gun during for installing welding wire Head stretches out.

To in the operation of this utility model welding machine and display control panel (38), it is designed with manual welding and gas shielded arc welding side Method switching button and status indicator lamp, gas shield welding arc welding gun switch 2T or 4T patten transformation button and status indicator lamp thereof, overheated Guard mode display lamp, (manual welding) electric current and (gas shield welding) wire feed rate regulator potentiometer, (gas shield welding) voltage-regulation current potential The parts such as device, adjustment of inductance potentiometer, ammeter and voltmeter.Manual welding and gas shielded arc welding power and energy button are for two kinds The selection of welding method, and indicated its state by corresponding display lamp；Gas shield welding arc welding gun switch 2T or 4T patten transformation button are used Mode of operation in arc welding gun switch selects, and is indicated its state by corresponding display lamp.2T pattern refers to press arc welding gun switch, opens Begin to carry out gas shield welding welding.Unclamp arc welding gun switch and then stop welding.4T pattern refers to press arc welding gun switch, proceeds by gas shield welding Welding, unclamps arc welding gun switch and continues to keep welding, again press arc welding gun switch, prepare to terminate welding, unclamp arc welding gun switch and then stop Only welding.Overtemperature protection status indicator lamp (yellow or redness) then indicates whether superheat state occurs.When internal components temperature mistake Height, when exceeding the operating temperature of temperature relay, under the effect of control circuit, on the one hand can make this display lamp light；Another Aspect, can make welding machine stop welding or output.In the case of welding machine does not exports, the cooling effect of blower fan can make the temperature of device Reduce.When being reduced to the recovery action temperature of thermal protector, protector recovers, and welding machine superheating phenomenon eliminates.Overheating indicator lamp Extinguish.Meanwhile, welding machine can weld again.During manual welding, corresponding electric current regulator potentiometer is used to carry out electric current output regulation；Gas When protecting weldering, the size of current of output can be adjusted by corresponding wire feed or electric current regulator potentiometer.Output weldingvoltage is then It is adjusted by corresponding voltage potentiometer.For improving the arc characteristic of gas shield welding welding, it is additionally provided with electronic inductor or electricity Sense regulator potentiometer.The ammeter of the composition such as charactron and voltmeter are then for showing the preset or standard parameter of actual welding.

Operation and display control panel circuit are control circuit (two) part, and other control circuit is control circuit (one) portion Point.It is provided with CON5 and CON1 interface.Two control circuit parts are directly linked together by plug-in unit.Accompanying drawing 3 ~ accompanying drawing 8 is altogether With constituting the control circuit schematic diagram that welding machine is complete.

The control circuit plate part of this utility model welding machine contains master board 13, display circuit board 38 etc., the device in front Being mainly electronic devices and components or the parts of plug-in type, the automatic and artificial plug-in unit of main employing, the mode of welding complete circuit Plate is processed.And the device of back of circuit board is mainly SMD electronic devices and components or parts, all use automatic chip mountings and The mode of welding completes circuit board processing.Just think, if all of components and parts and parts all in the front of circuit board, then The size of circuit board necessarily strengthens.This size that will strengthen welding machine and weight；If the welding machine as other multi circuit board structure Like that, having a lot of control connecting lines between circuit board, then manufacturing process will necessarily be many, production technology also can be complicated.It is visible, This utility model is little because of circuit board size, designs compact conformation, connects control line few, therefore the board production manufacturing procedure of welding machine Few, processing technology is greatly simplified, convenient production.Such design and processing technique, it is ensured that the production of product has The highest production efficiency, meanwhile, error rate and cost of manufacture are low, are conducive to improving the competitiveness of product in market.

Additionally, at structure design aspect, by dividing plate, the mechanical part of welding machine is divided with internal control circuit part Opening, control circuit part is equivalent to be surrounded by the shell of dividing plate, shell, base plate, rear board and front panel composition, can play isolation Big electric current strong electromagnetic, limit electromagnetic radiation, improves the effect of welding machine reliability.

From the point of view of the control function of adnexa interlock circuit, mainly complete the generation of power supply, pwm pulse width tune Joint, IGBT pipe drive the inverter circuit output parameter (electric current, voltage) of control and inversion, different welding method to control, welding side The work such as method selection and control, the regulation of wire feed rate and control.Final under the effect of control circuit, realize manual electricity respectively Arc-welding, argon arc welding, every control requirement of MIG/MAG gas shield welding.

The operation principle of this utility model welder circuit is summarized as follows: power input line (23) is connected to three-phase 380V exchange Power supply.Electric network source is connected by the S1 on and off switch (21) on welding machine rear board.The alternating current come from electrical network, first passes through Rectified alternating current is become after DB1 rectifier bridge (such as MDS50-14,50A/1400V etc.) rectification.Afterwards, by inductance L1(input electricity Anti-, 36) being charged 1C3 ~ 1C6 electrochemical capacitor, between dc bus, voltage gradually rises, eventually become relatively stable+ 310V unidirectional current.The effect of inductance L1 has two aspects, and one is to buffer electric current when connecting S1 on and off switch.Because, Before S1 on and off switch Guan Bi, between 1C3 ~ 1C6 electrochemical capacitor two ends or dc bus, voltage is zero, is equivalent to short circuit. Inductance L1(input reactance, 36) existence can play the effect limiting the switching current that powers on so that it is is slowly increased, prevents from burning out S1 The contact of on and off switch (21).On the other hand, inductance L1(input reactance, 36) and the parameter coordination of 1C3 ~ 1C6 electrochemical capacitor, right The power factor (PF) improving welding machine is favourable.Data in terms of knowledge in terms of some can inquire about relevant passive PFC about this is made Further appreciate that.Here, just repeat no more.The effect of electric capacity 1C1 ~ 1C2 is the most anti-interference, reduces electric network source to inversion The interference of welder circuit；The effect of varistor RV1 is mainly overvoltage protection.These are all the functional reliabilities improving welding machine. 1C3 ~ 1C6 electrochemical capacitor plays the effect of filtering.The on the one hand supply of+310V unidirectional current is by Q1 ~ Q4 IGBT pipe, C6 ~ C7 electric capacity (brachium pontis electric capacity, 28), TX inversion main transformer (12) and D1 ~ D12(such as D92-02 etc.) fast recovery diode, L2 filter reactance (37), the half-bridge inversion circuit of the composition such as FLQ diverter.Its function is mainly: it is (several that+310V high voltage direct current is converted to intermediate frequency Ten KHz) alternating current.TX contravariant transformer (12) realizes the conversion of voltage step-down and High-current output.D1 ~ D12(such as D92-02 Deng) fast recovery diode be then contravariant transformer output medium frequency alternating current be transformed to unidirectional current.After converting due to it Current waveform is pulsation, unstable, is unfavorable for stablizing of welding process, therefore, uses current filter reactor L2(37) enter Row filtering.So, the current waveform of output will become stable.Be conducive to obtaining high-quality weld seam.On the other hand, accompanying drawing is seen 3 control circuit (one) parts, supply switching power circuit by plug CON1 ,+310V.See accompanying drawing 5, by T2 Switching Power Supply transformation Device, Q31 metal-oxide-semiconductor, D75 ~ D76 and D68 ~ D71 diode, the integrated pwm circuit of U13(UC3845) and U15, U17 ~ U18 integrated surely Depressor, and the switching power circuit of the device composition such as resistance around them, electric capacity, produce+5V ,+20V ,+15V ,+24V ,- The supply voltages such as 15V, supply the live line work such as other corresponding control circuit.About the operation principle of this part of Switching Power Supply, Here a brief description is made.Accompanying drawing 5 is the schematic diagram of Switching Power Supply.At the beginning of Q31 metal-oxide-semiconductor and T2 switching mode power supply transformer Level winding, and the built-up circuit such as D75 ~ D76 around them and D68 ~ D71 diode, a lot of resistance and electric capacity.Input electricity Source VCC is connected to HVDC+310V.Thus, the UC3845 of Switching Power Supply U13 PWM control and peripheral resistance, capacitance group The circuit become belongs to high tension loop.For guaranteeing the safety of control circuit, in figure 5, the photoelectrical coupler that have employed U14 is carried out Isolation.The kernel control chip of Switching Power Supply pwm control circuit is U13, i.e. UC3845 pwm pulse width adjustor.It is peripheral Resistance, electric capacity can set the relevant parameter of its work.As to how determine, need to check the data used in connection with of UC3845 or Explanation.It is not repeated herein.In a word, the driving pulse that pulse is certain operating frequency of 6 foot outputs of U13 chip, can make attached Q31 metal-oxide-semiconductor in Fig. 5 is in break-make duty.In the voltage follower circuit part of T2 switching mode power supply transformer, obtain respectively Obtain+5V ,+20V ,+15V ,+24V ,-15V ,-20V supply voltage.The device and the circuit work that supply other use.Such as, supply Operate and show control circuit interface CON5 and accompanying drawing 4 circuit；The supply control circuit such as wire feed and electromagnetic valve is (see accompanying drawing 3 and attached Fig. 7 circuit part)；Supply fan control circuitry (see accompanying drawing 3 CON13 part)；Supply inversion PWM and IGBT driving etc. control Circuit (see accompanying drawing 3 and accompanying drawing 6 circuit part)；Supply its output characteristics control circuit (see accompanying drawing 3 and accompanying drawing 8 circuit part) Deng.Additionally, from the circuit of Switching Power Supply part and schematic diagram, this utility model do not use general control transformator and Relevant voltage conversion circuit produces above-mentioned several supply voltage.Its circuit power taking is from+the 310V in major loop.Switch becomes The volume of depressor and size, being significantly less weight than general control transformator, this just reduces the cost of this utility model welding machine, promotes The technical value added of welding machine.

T1 driving transformer, U9 integrated PWM chip (SG3525A), Q18 ~ Q21 field effect transistor, Q9 ~ Q10 and Q13 ~ Q14 tri- Pole pipe and diode (such as D27 and D29) about, stabilivolt (such as D24 ~ D25), resistance (as R95, R40 ~ R41, R47 ~ R48), electric capacity (such as C20, C24, C39, C42 and C45), and near the group such as the C1 ~ C4 of CON10, D1 ~ D4, R1 ~ R4 in accompanying drawing 3 The drive circuit of Q1 ~ Q2 and Q3 ~ Q4 IGBT pipe in inverter main circuit is become to control part.Q1 ~ Q2, the two-way of Q3 ~ Q4 IGBT pipe Drive circuit form is substantially coincident.Owing to 11 feet and the 14 foot output pwm signals of U9 chip (SG3525A) drive power Little, therefore need through Q9 ~ Q10 and Q13 ~ Q14, Q18 ~ Q21 field effect transistor, T1 driving transformer, and above-mentioned a lot of periphery The driving control circuit of the composition such as device carries out power amplification.Isolating transformer is driven to go to control Q1 ~ Q2 and Q3 ~ Q4 by T1 again The on-off duty of IGBT pipe.In accompanying drawing 6,11 feet of U9 chip and 14 feet output control signal are two groups of PWM square wave arteries and veins Rush signal.The frequency of its square wave is fixing, has tens KHz.It by this chip RT, CT foot connect resistance and capacitance parameter (such as R46 and C23 etc.) determines.Two prescription wave pulse signals have a regular time poor in time, the most dead in specialty District's time.It is one of important parameter ensureing IGBT two groups switch alternation.This time is the peripheral device by U9 chip Part (such as R46 and C23 etc.) parameter arranges and determines.As to how determine, check data used in connection with or the explanation of U9 chip I.e. can be appreciated that.It is not repeated herein.Need exist for explanation: the pwm pulse bandwidth modulation signals of U9 chip output is to determine Welding machine inverter main circuit output voltage and the signal of size of current.Its pulse width depends on: 1) manual welding (containing argon arc welding) During controlled state, welding current Setting signal together decide on output current feedback signal.The object or the target that control are defeated Go out size of current.Time unloaded, feedback signal is the least.Control circuit produces the bigger pwm pulse signal of a dutycycle, make Q1 ~ Q2, Q3 ~ Q4 two groups IGBT pipe is in alternating conductive state, finally makes inverter main circuit output no-load voltage.When operator regulates The potentiometer of welding current on good front panel, and when welding, control circuit passes through FLQ diverter (300A/75mv), can examine Measure output current signal.On the one hand, it is thus achieved that the output current signal that welding current table shows.(main in other control circuit Operation and the display control circuit of accompanying drawing 4 part) effect under realize the display of current digital display table.On the other hand, inspection The current signal measured, under the effect of other control circuit (the mainly control circuit of accompanying drawing 6 and 8 part), through signal Amplifications etc. process, and in this, as current feedback control signal, compare with welding current Setting signal.Difference after Bi compare Value signal, carries out PI(ratio and integration) regulation control, its output output control welding machine output PWM chip pulse width or Dutycycle, determines welding machine output electric current and the size of voltage, it is achieved the accurate control of output current parameters.And make the output of welding machine Characteristic is the dropping characteristic dragged outside constant current band.Say further, when welding current Setting signal is constant, along with welder circuit is examined The electric current that measures increases, and, after reaching given setting value, welding current Setting signal and current feedback control signal Difference can increase with electric current and reduce, and after PI control, makes the pulse width of welding machine output PWM chip or dutycycle reduce, The output voltage of welding machine reduces.This process, the most so-called Current cut-off negative feedback controls.I.e. only reach weldering when electric current The feedback control just worked after connecing the setting value of current level device.Hereafter, along with the increase that electric current is small, voltage reduces can very Many.When voltage drops to below 16V, along with the reduction of voltage, control circuit can make the pulse width of welding machine output PWM chip Or dutycycle increases, make welding current increase according to the parameter set, ultimately form the dropping characteristic dragged outside constant current band.Work as welding During given value of current signal intensity, Current cut-off negative feedback setting value is different, but other control process is similar.So, exist Between the minimum and maximum that potentiometer sets, so that it may obtain without several negative characteristic curves.Such control, is also to meet by hand The basic demand that arc welding (containing argon arc welding) connects.2) during gas shield welding controlled state, by weldingvoltage Setting signal and output voltage Feedback signals etc. together decide on.The object or the target that control are output voltage sizes.Negative voltage feedback PI is used to control.Unloaded Time, control similar with manual welding, remain the pwm pulse width signal that output is bigger, it is thus achieved that floating voltage.After bringing onto load, then Control with manual welding is different.Gas shield welding, the output characteristics of welding machine controls to drag down outside flat characteristic rather than constant current band Drop characteristic.It is characterized in: load current changes greatly, and output voltage varies less, keep relative stability.Only give when voltage Determining signal when changing, the voltage of output just there will be large change.More than control process, be by corresponding control circuit Realize.

L3 is an amperometric, can detect in inverter main circuit, the primary current signal of main transformer.Its output LPa and LPb delivers to the control circuit (see top-right part in accompanying drawing 8) of the composition such as D31 ~ D32 and D36 ~ D37.Mainly check Whether inverter main circuit dc bus there is over-current phenomenon avoidance.If there is crossing stream, the stream display lamp D67 that crosses in accompanying drawing 6 lights； Q15(SCR IGCT) conducting, the cathode potential of D30 diode is pulled low to low level (GND), and audion Q11 ends, and Q12 leads Logical, the pwm signal of U9 chip 11 and 14 foot output is closed, and the drive control signal of welding machine inverter main circuit IGBT is closed, welding machine Close output.Meanwhile, panel overheated indication light diode is lighted, and OC/OT end also sends corresponding signal.

The control circuit parts such as inversion PWM and IGBT driving, its output DriveA and DriveB, DriveD and DriveC divide It is not two groups of pwm pulse signals, goes respectively to control Q1 ~ Q2 and the switching shape of two groups of IGBT switches of Q3 ~ Q4 in inverter main circuit State.The input Setting signal that the pulse width of this pwm signal is put by " 12 " in accompanying drawing 6 controls.Export with or without pwm signal, then take Certainly " 6 ", " 7 " and " signal of 9 controls, and was actually and flows or the control such as overheated in accompanying drawing 6.Such as, in accompanying drawing 3 The signal that CON4 connects is heat alarm Tc, is i.e. connected to temperature protector.And the aluminum that temperature protector is close to IGBT closes On gold radiator (30).When temperature protector is overheated, show main power device generation superheating phenomenon.Now, in accompanying drawing 8, Tc Current potential is pulled low to low level (GND), and meanwhile, OC end sends corresponding signal to display circuit, makes panel overheated instruction D10 luminous Diode is lighted, and control circuit will close pwm signal.Prevent welding machine from burning out because of overheated.Cold (being connected to CON13 interface) But, under the effect of blower fan, after dropping to a certain degree at a temperature of aluminium alloy heat radiator (30), the superheating phenomenon within welding machine disappears Removing, when thermal protector recovers, control circuit just can continue to put out pwm control signal.Overheating indicator lamp (yellow) extinguishes simultaneously.This It is achieved that welding machine overtemperature protection.When closing pwm signal, welding machine not output voltage or electric current, make Q1 ~ Q2 in inverter main circuit It is off state with two groups of IGBT switches of Q3 ~ Q4.

Operation and display control circuit, be positioned on display circuit board (38).U2 chip (GC7139C) controls voltage display number Code pipe.Its input UDP signal magnitude decides the video data of voltmeter.RV1 is voltage video data and virtual voltage data Correction trimmer potentiometer.U1 chip (GC7139C) controls electric current display charactron.Its input IDP signal magnitude decides electricity The video data of stream table.RV4, RV5 are the correction trimmer potentiometer of voltage, electric current video data and actual current data respectively. MMA/EN is operated circuit by manual welding (MMA)/gas shield welding (MIG/MAG) welding method select button S1 and controls to determine.Its circuit By U3(CD4013) chip, audion and button S1, and the composition such as the resistance of periphery, electric capacity.This control circuit, welding machine is powered The control default conditions of rear start are: MMA/EN is low level, i.e. MIG/MAG gas shield welding controlled state.Meanwhile, Q6 audion is led Logical, D3 light emitting diode MIG/MAG display lamp is lighted.Afterwards, when pressing a S1 button, MMA/EN becomes high level, with Time, Q4 triode ON, D4 light emitting diode MMA display lamp is lighted.Again press S1, then state can overturn again.2T/4T welds Rifle switched operating mode selection circuit is similar with said method selection circuit, does not give out in figure.4T/EN state is by 2T/4T Arc welding gun switch operator scheme select button operation circuit controls to determine.Its circuit is by U4 chip (CD4013), audion Q6 and presses Button S2, and the composition such as the resistance of periphery, electric capacity.This control circuit, the control default conditions that welding machine is started shooting after powering are: 4T/ EN is low level, i.e. MIG/MAG gas shield welding 4T controlled state.Light emitting diode 4T display lamp is lighted simultaneously.Afterwards, when pressing one During secondary S2 button, 4T/EN becomes high level, and meanwhile, light emitting diode 2T display lamp is lighted.Again press S2, then state can be again Secondary upset.It is overheated that OC/OT signal deciding from control circuits (being also shown in shown in accompanying drawing 6) such as inversion PWM and IGBT drivings Whether display lamp D10 lights.RV1 is that voltage gives, Ug and UgL is connected to this voltage and gives potentiometer.RV2 is given value of current, Ig and IgL is connected to this given value of current potentiometer.RV3 is that inductance gives, di/dtb and di/dta is connected to the given electricity of this inductance Position device, its relevant circuit is equivalent to electronic inductor, can change the characteristic of welding arc, improves appearance of weld and reduces welding Time splatter.Ich signal can affect unit of display display lamp and the ammeter arithmetic point state of current digital display table.Such as, Under manual welding.Now, MMA/EN becomes high level, Q4 triode ON, and D4 MMA display lamp is lighted.D9 display lamp is also bright , " V " unit display lamp is lighted.Q3 triode ON, D7 light emitting diode " A " unit display lamp is lighted.Display circuit part, Two digital tube portions show output voltage and current value respectively.Without welding, then the data of IDP and UDP can make circuit Show preset welding current and floating voltage.If welded condition, then can make circuit display actual welding electric current and welding electricity Pressure.In manual welding state, " D5 " m/min display lamp will not be lighted.Under gas shield welding, the result of control can be " D5 " m/ Min display lamp is lighted.About other control, everybody can be analyzed with combined circuit figure and understand.

Output characteristics control circuit part, mainly gives potentiometer (relevant to Ug and UgL), electric current according to voltage or send The given potentiometer of silk (relevant to Ig), inductance give the set-point of potentiometer (being correlated with di/dtb and di/dta), and are choosings Manual welding (containing argon arc welding) or gas shield welding (relevant to MMA/EN etc.) are selected, also from output loop diverter FLQ (300A/75mv) current feedback signal If-and If+, voltage feedback signal Uf+, and control from wire feed and electromagnetic valve etc. Signal and the states such as the P/MMA of circuit (see accompanying drawing 7 circuit part), determine welding machine be without output voltage or electric current (with overheated or It is relevant that over-current signal Tc etc. close pwm signal), still there are output voltage or electric current (to have pwm signal to export, with " 12 " in accompanying drawing 6 The input Setting signal of point etc. are relevant)；It is to show preset electric current and voltage parameter, or the electric current of display reality and voltage are joined The situations (relevant with Ich, SWLOCK level controling signal etc.) such as number." Voltage " signal from actual voltage feedback signal, Process through operational amplifier U1D and peripheral circuit thereof, represent the output voltage size of reality；" Current " signal From actual current feedback signal, process through operational amplifier U1A and peripheral circuit thereof, represent the output of reality Voltage swing.U5 chip (CD4053) is multi-channel electronic switch.The data mainly controlling display are unloaded and preset parameters, Or actual weldingvoltage and current data.Such as, make U5C's when Ich, MMA/EN1, SWLOCK level controling signal state When 3 feet and 4 feet are connected, the data of IDP output are " Current " signals, the size of current of i.e. actual output.Meanwhile, the 13 of U5A Foot and 14 feet are also to turn on state, and the data of UDP output are " Voltage " signals, the voltage swing of i.e. actual output.Instead It, when 5 feet of U5C and 4 feet connect (meanwhile, 15 feet and 2 feet of U5B are also connected), the data of IDP output are the letters from " Ig " Number, the most preset given size of current.Similarly, 12 feet of U5A and 14 feet in an ON state time, UDP output data be From " Ug " signal, the most preset given voltage swing.MMA/EN level state, already mentioned above, it is and have selected hands Work weldering or gas shield welding are correlated with.When selecting MIG/MAG gas shield welding, MMA/EN is low level；When selecting manual welding, MMA/ EN is high level.From accompanying drawing 8 it can be seen that when MMA/EN is high level, MMA/EN1 is+24V high level.Otherwise, gas is protected During weldering, MMA/EN1 is then low level.Under gas shield welding, owing to MMA/EN1 is low level, audion Q22 ends, U12 optocoupler Lumination of light emitting diode, its internal triode ON, make the input signal of R83, namely this road invalidating signal of given value of current. I.e. during gas shield welding, Ig potentiometer is inoperative.Under manual welding state, P/EN is high level, audion Q23 can be made to turn on, pass through The clamp of D55 and D56 diode, makes Ug1 point current potential be pulled to relatively low level, i.e. its effect to be: during manual welding, Ug potentiometer does not rises Effect.

The input Setting signal that " 12 " of control circuit are put is to determine welding machine inverter main circuit output voltage and size of current Signal.Its pulse width depends on: 1) during manual welding, by welding current Setting signal Ig and output current feedback signal If-and If+ etc. together decide on.The object controlled or target are output size of current.Time unloaded, feedback signal is the least.Control electricity Road produces the pwm pulse signal that a dutycycle is bigger, makes Q1 ~ Q2, two groups of IGBT of Q3 ~ Q4 be in maximum conducting state, finally Make inverter main circuit output no-load voltage.When operator regulate Ig give electric current and weld time, control circuit passes through FLQ Diverter (300A/75mv) detects output electric current If-and If+ feedback signal.After U1A and peripheral circuit thereof process, one Aspect, is the output current signal that " Current " obtains that welding current table shows by circuit conversion, and it is aobvious to realize current digital Show the display of table.On the other hand, the current feedback signal after detection is amplified gives Ig signal with welding current and compares.Relatively After difference signal, through the electric current PI(proportional+integral that rear class operational amplifier U2B etc. forms) control circuit, its output The pulse width of output control welding machine output PWM chip or dutycycle, determine welding machine output electric current and the size of voltage, it is achieved defeated Go out the accurate control of current parameters.And to make the output characteristics of welding machine be the dropping characteristic dragged outside constant current band.Say further, work as weldering Connect given value of current Ig signal constant time, along with current feedback If-detected and If+ signal increase, and reach given Ig's After setting value, welding current Setting signal can reduce, by control with electric current increase with the difference of current feedback control signal After system, making welding machine output pwm pulse width or dutycycle reduce, the output voltage of welding machine reduces.This process is namely so-called Current cut-off negative feedback control.The feedback control i.e. only just worked after electric current reaches the setting value of welding current potentiometer System.Hereafter, along with the increase that electric current is small, voltage reduces can be a lot.When voltage drops to below 16V, along with the fall of voltage Low, control circuit can make the pulse width of welding machine output PWM chip or dutycycle increase, and makes welding current according to the parameter set Increase, ultimately form the dropping characteristic dragged outside constant current band.When welding current Setting signal changes, Current cut-off negative feedback sets Value difference, but other control process is similar.So, between the minimum and maximum that potentiometer sets, so that it may obtain nothing Several negative characteristic curves.Such control, is also to meet the basic demand that manual electric arc welding (containing argon arc welding) connects.2) gas shield welding During controlled state, weldingvoltage give Ug signal and together decide on output voltage feedback signal Uf etc..The object controlled or mesh Mark is output voltage size.The circuit using the compositions such as operational amplifier U1C carries out negative voltage feedback PI control.Time unloaded, with Manual welding controls similar, remains the pwm pulse width signal that output is bigger, it is thus achieved that floating voltage.After bringing onto load, then with craft The control of weldering is different.Gas shield welding, the decline that the output characteristics of welding machine controls to be to drag outside flat characteristic rather than constant current band is special Property.It is characterized in: load current changes greatly, and output voltage varies less, keep relative stability.Only when the given letter of voltage When number changing, the voltage of output just there will be large change.More than control process, be to be come in fact by corresponding control circuit Existing.It can be seen that change inductance to give the set-point of potentiometer from accompanying drawing 8, di/dtb and di/dta can change, eventually Change the characteristic of welding arc.

The control circuit part such as wire feed and electromagnetic valve, there is+5V ,+15V ,+24V voltage its supply voltage interface section.Also have Arc welding gun switch signal SWA and SWB(CON2 socket from welding machine front panel.During gas shield welding, by pressing arc welding gun switch SW1, can Realize wire feed, supply gas, welding process etc. controls)；(CON14 interface, when GAS interface end level is for the GAS signal of control electromagnetic valve Time low, it is connected to the electromagnetic gas valve action of CON14, can realize protecting the break-make of gas to control)；Control signal MOT-of wire feeding motor With MOT+(CON3 interface, when having output voltage when between the two terminal, connect the wire feeding motor operating of so far interface, can realize Wire feed controls)；The parts such as given value of current signal (relevant to Ig and IgL) and 2T/4T state control signal.U7A is CD4013 core Sheet；U6 is CD40106B chip.MOT+ and MOT-interface is connected to the wire feeding motor that rated voltage is 24V.Wire feeding motor belongs to An ingredient of wire-feed motor (9) in accompanying drawing 1.When wire feeding motor rotates, welding wire is driven to be transported to welding gun.Before realizing welding Welding wire install and welding time wire feed action.

It is pwm pulse width modulator that wire feed controls U8 chip TL494.It is with a lot of diode, resistance and electricity outside it The devices such as appearance.Its 8 and 11 foot outfan produces the square-wave pulse signal of fixed frequency.Frequency and Dead Time are by R7 and C6 certainly Fixed.The pwm control signal of 8 feet of U8 and the output of 11 feet goes to control Q2 MOS after the circuit that D11 and D12, Q1, Q2 etc. form Pipe.By controlling the make-and-break time of Q2 metal-oxide-semiconductor, thus control the rotating speed of wire feeding motor.PWM control pulse width be by Fixed wire feed rate value Ig determines.Change given size and can change pulsewidth, the final size changing wire feed rate.D14 Diode group is fly-wheel diode, the back-emf of the elimination wire feeding motor adverse effect to Q2.The device groups such as R12, Q3 metal-oxide-semiconductor The control circuit become, constitutes the dynamic braking control circuit of wire feeding motor.When the input (13 foot) of U6F is low level, U6F Outfan (12 foot) output high level.Now, Q3 turns on, and connects resistance R12, makes the energy stored on motor winding quickly lead to Cross R12 release, so that wire feeding motor quickly stops operating.So, welding wire is just unlikely and can stretch out welding gun head gas shield Cover is too many, the normal operating of impact welding.

When gas shield welding controls, SWLOCK is low level.1 foot of U6A, 2 feet, 4 foot level are by arc welding gun switch SWA and SWB shape State and 2T/4T level state control.When selecting 2T welding gun mode of operation, 2T/4T level is high level.Now audion Q7 Conducting, the cathode potential of D17 diode be pulled low to low level " ".The clamping action of D17,5 feet making U6C are low level, 6 feet of U6C, namely the 4 foot R(of U7A reset) hold as high level.The 1 foot Q output of U7A is low level.Now, if welded Rifle switch SWA and SWB closes, then 1 foot of U6A becomes low level, and 2 feet become high level, and 4 feet become low level.The high electricity of 2 feet Flat 12 feet making U6F are low level, and field effect transistor Q3 does not turns on, and wire feeding motor energy-dissipating brake circuit disconnects.Meanwhile, the moon of D7 Extremely high level, on the one hand making GAS/EN is high level, on the other hand, makes Q5 turn on, and stabilivolt D15 punctures, voltage stabilizing, and Q4 field is imitated Should turn on by pipe, GAS terminal connection+24V, electromagnetic gas valve action, the weld zone that protective gas can be made to be transported to welding gun termination enters Row protection.Owing to there being wire feed to give Ig, under the effect of TL494 and peripheral circuit thereof, the square wave of the 8 and 11 foot outputs of TL494 Pulse pwm control signal goes to control Q2 metal-oxide-semiconductor after the circuit that D11 and D12, Q1, Q2 etc. form.By controlling Q2 MOS The make-and-break time of pipe, thus control the rotating speed of wire feeding motor.Afterwards, electric arc is ignited, and welding process proceeds by.Welding process In, it is to be determined by wire feed rate value Ig given that PWM controls the width of pulse.Change given size and can change pulsewidth, The final size changing wire feed rate.It is actually the size changing welding current.After unclamping arc welding gun switch, 1 foot of U6A Becoming high level, 2 feet become low level, and 4 feet of U6B become high level.The low level of 2 feet makes 12 feet of U6F be high level, field Effect pipe Q3 turns on, and wire feeding motor energy-dissipating brake circuit is connected, and wire feeding motor does not rotates, and stops wire feed.Meanwhile, the negative electrode of D7 is Low level, on the one hand making GAS/EN is low level, on the other hand, makes Q5 end, and stabilivolt D15 will not puncture, voltage stabilizing, and Q4 field is imitated Should be not turned on by pipe, GAS terminal will not connect+24V, and electromagnetic gas valve is failure to actuate, and protective gas cannot carry.

When selecting 4T welding gun mode of operation, 2T/4T level is low level.Q7 audion ends.Ich and ICS is for passing through The control signal obtained after current detecting and control circuit.When welding machine has electric current to export, Ich terminal is high level.Work as detection Export electric current to welding machine, and when electric current is more than certain value, ICS is low level.Now, if arc welding gun switch SWA and SWB closes On, then 1 foot of U6A becomes low level, and 2 feet become high level, and 4 feet become low level.The high level of 2 feet makes 12 feet of U6F be Low level, field effect transistor Q3 does not turns on, and wire feeding motor energy-dissipating brake circuit disconnects.Meanwhile, the negative electrode of D7 is high level, a side Face makes GAS/EN be high level, on the other hand, makes Q5 turn on, and stabilivolt D15 punctures, voltage stabilizing, and Q4 field effect transistor turns on, GAS end Sub-connection+24V, electromagnetic gas valve action, the weld zone that protective gas can be made to be transported to welding gun termination is protected.Owing to sending The given Ig of silk, under the effect of TL494 and peripheral circuit thereof, the square-wave pulse pwm control signal of the 8 and 11 foot outputs of TL494 Go to control Q2 metal-oxide-semiconductor after the circuit of the composition such as D11 and D12, Q1, Q2.By controlling the make-and-break time of Q2 metal-oxide-semiconductor, from And control the rotating speed of wire feeding motor.Electric arc is ignited afterwards, and welding process proceeds by.Ich terminal is high level.5 feet of U6C For high level, 6 feet of U6C, namely 4 feet (R reset terminal) of U7A are low level.After unclamping arc welding gun switch, 1 foot of U6A becomes For high level, 2 feet of U6A become low level, and 4 feet of U6B become high level.The CLK end making U7A produces rising edge pulse, makes The Q end output high level of U7A.12 feet making U6F are low level, and field effect transistor Q3 is not turned on, wire feeding motor energy-dissipating brake circuit Disconnecting, wire feeding motor rotates, and proceeds wire feed.The negative electrode of D7 is high level simultaneously, and on the one hand making GAS/EN is high level, separately On the one hand making Q5 turn on, stabilivolt D15 punctures, voltage stabilizing, and Q4 field effect transistor turns on, GAS terminal connection+24V, and electromagnetic gas valve continues Holding action, protective gas continues conveying.When, after the arc welding gun switch that again closes, 1 foot of U6A becomes low level, 2 feet of U6A become For high level, 4 feet of U6B become low level.The CLK end making U7A produces trailing edge pulse.Owing to welding current yet suffers from, Ich is high level, and 5 feet of U6C are high level, and its 6 foot level is also that the R reset terminal level of U7A continues to keep low level.This is just The output Q end making U7A remains in that original high level state.12 feet making U6F are low level, and field effect transistor Q3 is not turned on, Wire feeding motor energy-dissipating brake circuit disconnects, and wire feeding motor rotates, and proceeds wire feed.The negative electrode of D7 is high level simultaneously, a side Face makes GAS/EN be high level, on the other hand makes Q5 turn on, and stabilivolt D15 punctures, voltage stabilizing, and Q4 field effect transistor turns on, GAS terminal Connection+24V, electromagnetic gas valve continues holding action, and protective gas continues conveying.After again unclamping arc welding gun switch, 1 foot of U6A Becoming high level, 2 feet of U6A become low level, and 4 feet of U6B become high level.The CLK end making U7A produces rising edge pulse. Owing to welding current yet suffers from, Ich remains high level, and 5 feet of U6C remain high level, and its 6 foot level is also the R of U7A Reset terminal level continues to keep low level.The Q end output making U7A is low level by high level upset.12 feet making U6F are high electricity Flat, field effect transistor Q3 turns on, and wire feeding motor energy-dissipating brake circuit is connected, and wire feeding motor stops operating, and wire feed stops.D7 simultaneously Negative electrode is low level, and on the one hand making GAS/EN is low level, on the other hand makes Q5 end, and stabilivolt D15 will not puncture, voltage stabilizing, Q4 field effect transistor is not turned on, and GAS terminal will not connect+24V, electromagnetic gas valve stopping action, and protective gas stops conveying.Welded Journey terminates.

Crawl wire feed controls: when selecting MIG/MAG gas shield welding, and when pressing the crawl wire feed button SW2 in accompanying drawing 3 Time, when SS/EN terminal connects+15V high level, carry out crawl wire feed operation.Now, 13 feet of U6F are high level, and 12 feet are low Level, field effect transistor Q3 does not turns on, and wire feeding motor energy-dissipating brake circuit disconnects.Meanwhile, the negative electrode of D7 is low level, on the one hand Making GAS/EN is low level, on the other hand, makes Q5 be not turned on, and stabilivolt D15 will not puncture, voltage stabilizing, and Q4 field effect transistor is not turned on, GAS terminal is not turned on+24V, and electromagnetic gas valve is failure to actuate, and protective gas cannot carry.Owing to having voltage to add by D22 diode To R25.Now, there is certain wire feed to give setting value and be input to the IN-input of TL494, at TL494 and peripheral circuit thereof Under effect, 8 and 11 feet of TL494 export certain square-wave pulse pwm control signal, through the composition such as D11 and D12, Q1, Q2 Go after circuit to control Q2 metal-oxide-semiconductor.By controlling the make-and-break time of Q2 metal-oxide-semiconductor, so that wire feeding motor is according to the control set Rotational speed, drives welding wire to be sent into.Thus realize crawl wire feed process control.The operation of crawl wire feed can make welding wire from welding gun head Stretch out certain length, about about 10mm.During crawl wire feed, electromagnetic valve is failure to actuate, welding machine the most not output voltage or Electric current.Crawl wire feed controls to be primarily to facilitate user installation welding wire in welding gun.The speed of crawl wire feed is not quickly, because Too fast wire feed, is not easy to the installation of welding wire.Generally, wire feed rate when being less than welding is a lot.

Gage of wire selects to control: when selecting MIG/MAG gas shield welding, and when 0.8/1.0 terminal connects+15V high level Time, carry out gage of wire and select to control.From accompanying drawing 7, when 0.8/1.0 terminal is connected and disconnects+15V high level, its Change is the size of the IN-input end signal of TL494.Two states, different wire feed rate set-points is added to TL494's IN-input.It is to say, the rotating speed of wire feeding motor can be made to change.It is known that thin wire melting is fast, it is desirable to Wire feed rate is also larger.Otherwise, thick wire melting is slow, and wire feed rate wants slow the most accordingly.Gage of wire Select to control, it is simply that the circuit set for meeting above-mentioned requirements, is the one making thickness wire bond connection control circuit better conform to Good control mode.

When manual welding controls, SWLOCK is high level.1 foot that can make U6A is high level, and 2 feet are low level, and 4 feet are high Level.The result controlled is that wire feeding motor does not rotates, and electromagnetic gas valve is failure to actuate.It controls process, and reader can analyze voluntarily.Have Some before are analyzed and explanation, and we are just not explained in detail here.

Be above each circuit board section of this utility model and two kinds of welding methods briefly controls procedure declaration.Because illustrating electricity Road principle is more complicated.Below thought and the result of control are only given.But given detailed circuit due to this utility model former Reason figure, therefore for having the people of circuit reading ability (or possessing interlock circuit knowledge), can understand completely.Circuit Figure is also a kind of noiseless language.But for there is no the people of circuit reading ability (or not possessing interlock circuit knowledge), i.e. Making the most of explanation, they are also elusive.In view of the relation of length, patent specification can only illustrate main portion Point, so that patent specification reader better understood when operation principle and the process being correlated with.

Visible by described above, this utility model has mentality of designing and the method for oneself uniqueness.Not only can realize welding machine Two kinds of welding method outputs etc. control, and, the structure design of designed control circuit and welding machine, is all to make this practicality newly Type welding machine product has the basic reason place of the technical advantages such as control performance is good, machine structure is compact, is also to meet product Efficiently and low-cost production, high reliability, the important leverage of manufacturing process technology advance.This utility model patent application is protected Content be that structure and the circuit design protecting this welding machine.

Above content be combine concrete machine structure and circuit board and control function this utility model is made detailed Explanation, it is impossible to assert that of the present utility model being embodied as is only limited to these explanations；To its of technical field described in the utility model For he technical staff, without departing from the inventive concept of the premise, it is also possible to make some other deduction and conversion, these All should be considered as belonging to the category of this utility model protection.

Claims (4)

1. a structure for Multifunctional three-phase 380V single tube IGBT inverter type welder, welding machine mainly includes housing, front panel, below Plate, base plate, wire-feeding part and panel, it is characterised in that: described wire-feeding part includes: wire reel during gas shielded arc welding Axle, wire feeder, European gas shield welding welding gun interface and wire-feeding control circuit part, wire feeder and wire feeding disc axle are arranged on dividing plate On, wire feeder carries out phase near the front panel of welding machine, wire feeder with the European gas shield welding welding gun interface of installation on front panel The connection answered, during gas shield welding, gas shield welding welding gun is connected with European gas shield welding welding gun Interference fit, and welding wire is arranged on wire reel axle On, the protective gas interface on European gas shield welding welding gun interface is connected to electromagnetic gas valve by a trachea, and protective gas is from weldering The gas input port of electromagnetic gas valve it is linked into outside machine；Described panel includes power on buffer circuit, input rectifying and filtering Circuit, four single tube IGBT and inversion main transformer and the inverter main circuit of the output composition such as rectification, filtering thereof；Switch power supply Road；The control circuits such as inversion PWM and IGBT driving；The control circuit such as wire feed and electromagnetic valve；Output characteristics control circuit；Welding machine is grasped Make and display control circuit.

The structure of a kind of Multifunctional three-phase 380V single tube IGBT inverter type welder the most as claimed in claim 1, it is characterised in that: institute It is provided with on the rear board stated: on and off switch, power supply line, power line cannot not draw de-ly (also referred to as wire fixer), cooling fan, guarantor Protect the gas joint of gas or suction nozzle and electromagnetic gas valve, grounding screw；It is provided with on described front panel: European welding gun interface group Part, black output snap joint holder assembly, red output snap joint holder assembly, operation and display control panel, manual welding electricity Stream and gas shield welding wire feed rate regulator potentiometer, gas shield welding voltage-regulation potentiometer, adjustment of inductance potentiometer；In operation and display On control panel, it is designed with manual welding and electrogas process switching button and status indicator lamp, gas shield welding arc welding gun switch 2T or 4T patten transformation button and status indicator lamp, overtemperature protection status indicator lamp, manual welding electric current and gas shield welding wire feed speed Degree adjusting knob, gas shield welding voltage-regulation knob, adjustment of inductance knob.

The structure of a kind of Multifunctional three-phase 380V single tube IGBT inverter type welder the most as claimed in claim 1, it is characterised in that: behaviour Make and the control circuit of display control circuit employing two panels GC7139C chip composition, control often to organize the charactron of 3 respectively, join The ammeter and the voltmeter that close other the composition such as control circuit and charactron can show the preset or specification of actual welding respectively Parameter；The control circuit of two panels CD4013 chip composition, respectively constitutes manual welding/gas shielded welding method selection, the weldering of gas shield welding 2T/4T Rifle switching manipulation mode selects control circuit.

The structure of a kind of Multifunctional three-phase 380V single tube IGBT inverter type welder the most as claimed in claim 1, it is characterised in that: control Use two-sided layout in making sheet, a small amount of large-sized device layout in front, rely primarily on manual work mode complete assembling and Welding, and substantial amounts of electronics surface-mounted device layout is at the back side of large circuit board, is processed according to automated manner；On this circuit board Circuit, is divided by function, is designed with: by the buffer circuit that powers on, input rectifying and filter circuit, four single tube IGBT and inversion master Transformator and the inverter main circuit of the output composition such as rectification, filtering thereof；Switching power circuit；Inversion PWM and IGBT driving etc. are controlled Circuit processed；The control circuit such as wire feed and electromagnetic valve；Output characteristics control circuit；Welding machine operation and display control circuit.