CN205551751U - Structure of two welding function IGBT contravariant welding machines - Google Patents

Abstract

The utility model relates to a structure of two welding function IGBT contravariant welding machines, welding machine inside divide into left and right two side overall arrangements, and spare parts such as circuit board, cooling blower are arranged to one side, spare parts such as thread feeding mechanism, reactor are arranged to the opposite side. Circuit board design is two, wherein one the design has six charactrons and shows control circuit on the board in order to show and operation control panel, be divided into two sets ofly, show electric current and voltage parameter respectively, manual welding gas shield welding method switching button, gas shield welding 2T4T welder on -off operation mode selector button in addition, voltage, electric current and send the unit pilot lamp of a speed, overheated pilot lamp to and the electric current send a speed, voltage and electron reactor inductance to set for the regulator potentiometer, another large circuit board, its electronic components is two -sided to be arranged, the utility model discloses 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 of welding machine also have unique part.

Description

A kind of structure of two welding function IGBT inverter type welders

Technical field

The utility model relate to a kind of single tube IGBT inversion, with the MIG/MAG gas shield of manual electric arc welding function Welding machine.Belong to electric welding machine 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, small-sized metal-oxide-semiconductor, IGBT pipe contravariant MIG/MAG gas shielded welding machine rated current usual At 140 ~ 200A(cyclic duration factor 100 ~ 35%) level.This type of welding machine product most is all single MIG/MAG gas Protection weldering function.Its range of application can be subject to certain restrictions.

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 manufacture craft etc. are the most entirely different.These all can affect The production of product and cost of transportation.Such as some welding machines on market, its control panel is divided into several pieces, is respectively fixed on the machine frame. A lot of connecting line is used to be attached between each control panel.Not only need to process a lot of control connecting lines, and circuit board accounts for Big according to space, package size is big and Heavy Weight.So cost of manufacture of product is the highest, weakens product competitiveness in the market.City Although also there being the multifunctional welding machine using Digital Control on field, but its exploitation and the cost of making, and the price sold is also The highest, also it is unfavorable for the product competition in international DIY market.Therefore, how on the premise of low cost, develop multi-functional welding machine There is certain technical difficulty.This is also the problem that the utility model needs to solve.

Utility model content

The purpose of this utility model is to provide the structure of a kind of two welding function IGBT inverter type welders, has manual arc Weldering and the function of two kinds of welding methods of MIG/MAG gas shielded arc welding, its internal employing left-right layout structure.Side cloth circuits The parts such as plate, cooling blower；Opposite side arranges the parts such as wire feeder, reactor；Some devices on additional front and back panel Part, such as, power switch, operation and display circuit board, fan, suction nozzle and electromagnetic gas valve, output snap joint seat, European welding gun The parts such as interface.Board design is one block of big plate, the two-sided layout of electronic devices and components.On this large circuit board, divide by function, Be designed with: by input filter circuit, input voltage signal testing circuit, 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 The control circuits such as PWM and IGBT driving；The control circuit such as wire feed and magnetic valve；Output characteristics control circuit；Welding machine operates and aobvious Show control circuit interface and corresponding circuit thereof；Can be conveniently realized by the utility model: 1) function of manual welding/gas shield welding Conversion and state indicate；2) manual welding output characteristics and parameter shows and state instruction etc. controls；3) crawl of gas shield welding send Silk controls；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 Characteristic output, voltage and wire feed rate regulation etc. control function and Parameter units instruction etc..

The most by the following technical solutions:

The structure of a kind of two welding function IGBT inverter type welders, including housing, rear board and front panel, it is characterised in that: Its internal structure uses left-right layout design, and side, the left side is disposed with wire feeder and reactor, in its wire reel axle is arranged on On portion's median septum, wire feeder is arranged on base plate, near welding machine front panel, and welds with the European gas shield welding of installation on front panel Gun platform links together；The right opposite side arranges large circuit board, cooling blower；By the internal median septum of welding machine, in welding machine Portion's mechanical part separates with the primary control circuit plate part on the left side, the primary control circuit plate part on its left side be equivalent to by The metal shell of dividing plate, shell, base plate, rear board and front panel composition surrounds, and can play isolation electromagnetic interference, prevent electromagnetism spoke Penetrating effect, cooling blower forms cooling air channel with the radiator on the large circuit board of the right, IGBT pipe and fast recovery diode；Electricity Road plate is designed as two pieces, one of for showing and operation control panel, plate is designed with six charactrons and display controls Circuit, is divided into two groups, shows electric current and voltage parameter, also manual welding/gas shielded welding method switching button, gas shield welding 2T/ respectively 4T arc welding gun switch mode of operation select button, the unit indicator lamp of voltage, electric current and wire feed rate, overheating indicator lamp, Yi Ji electricity Stream, voltage and electronic inductor inductance parameters set regulation potentiometer；Another block large circuit board, its electronic devices and components double-sided cloth Put, between two pieces of circuit boards, carry out circuit connection by a plug-in unit and a small amount of connecting line.

Described operation and display circuit board part use two panels GC7139C control chip to be the circuit of core, control respectively The charactron of system often group 3, is used for showing voltage, electric current or wire feed rate parameter, coordinates control circuit, the electricity of charactron composition Stream table and voltmeter can show the preset or standard parameter of actual welding respectively；Two panels CD4013 control chip is the electricity of core Road, respectively constitutes manual welding/gas shielded welding method selection, gas shield welding 2T/4T arc welding gun switch mode of operation selection control circuit.

It is also devised with manual welding and gas shielded welding method switching button in described operation and display circuit board and state refers to Show 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 regulation potentiometer, gas shield welding voltage-regulation potentiometer, adjustment of inductance potentiometer circuit part.

The electronic devices and components of described large circuit board use two-sided layout, and a small amount of large-sized device layout is in front, greatly The device of size relies primarily on manual work mode and completes assembling and welding, and substantial amounts of electronics surface-mounted device layout is at large circuit board The back side, be processed according to automated manner, the circuit on this circuit board, by function divide, be designed with: by input filter circuit, Input voltage signal testing circuit, the buffer circuit that powers on, input rectifying and filter circuit, four single tube IGBT and inversion main transformer pressure Device and output rectification, the inverter main circuit of filtering composition；Switching power circuit；Inversion PWM and IGBT drives control circuit；Send Silk and solenoid valve control circuit；Output characteristics control circuit；Welding machine operates and shows control circuit interface and corresponding circuit thereof.

The parts installed on described rear board mainly have power switch, band plug power supply line, cooling blower, guarantor Protecting gas suction nozzle and electromagnetic gas valve, the cold wind air admission hole from welding machine case rear portion enters, and can make some heater members on circuit board Or parts have good cooling effect.

Can be conveniently realized by the utility model: 1) power and energy of manual welding/gas shield welding and state instruction；2) manual The output characteristics of weldering and parameter show and the control such as state instruction；3) the crawl wire feed of gas shield welding controls；Arc welding gun switch 2T or 4T Patten transformation controls and state instruction；Preflow, delayed time control of holding one's breath；And flat characteristic output, voltage and wire feed speed Degree regulation etc. controls function and Parameter units instruction etc..Additionally, each control circuit device major design cloth of the present utility model Office is on one piece of large circuit board.More large-sized devices, by the way of automatic and a small amount of artificial plug-in unit, are arranged on this electricity The one side of road plate, a lot of undersized devices are then to be mounted directly and be welded on this circuit board by the way of automatic chip mounting Another side.Thus the production process of device can be simplified, reduce manufacturing cost.Weldering unlike other multi circuit board structure Machine design like that, has a lot of connection control lines between its circuit board, production operation is many and complex manufacturing, Er Qie electricity Road plate also takes up bigger space, makes package size big, Heavy Weight.It is to say, use design philosophy of the present utility model and Mode reduces product size, reduces weight and cost of transportation.Meanwhile, few because controlling line, welding machine production and processing operation reduces, Manufacture craft have also been obtained simplification, convenient production.From the point of view of the function of its circuit, mainly complete the product of power supply Life, pwm pulse width adjusting, IGBT pipe drive inverter circuit output parameter (electric current, the voltage) control of control, two kinds of welding methods System, welding method select and control, the regulation of wire feed rate and control etc. control function.It is final under the effect of control circuit, Realize manual arc welding, all control performance requirements of MIG/MAG gas shield welding respectively.

The 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 180A/23V (35%, cyclic duration factor, lower with), 160A/22V(60%) etc. multiple current class and the product of specifications and models.Rated current is more Little, then rated duty cycle is the highest.Certainly, these changes, it is therefore an objective to make the cost of manufacture of product and the rule of corresponding machine Lattice parameter and performance indications match.So, the welding machine of every kind of specifications and models could realize optimized cost control.This just carries Rise the market competitiveness of institute's development.

The utility model, owing to having the use function of two kinds of welding methods, solves simple function welding machine application surface narrow Problem, thus have more preferable adaptability than the welding machine of simple function.Its good circuit and structure design thereof are also that this practicality is new The advantage place of type, is also to meet efficiently and low-cost production, high reliability, the important leverage of manufacturing technology advance.This reality The unique distinction of oneself it is designed with the circuit theory of new welder, circuit board and complete machine structure.The utility model patent application The content of protection is that circuit and the structure design protecting this welding machine.

Accompanying drawing explanation

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

Accompanying drawing 2 is schematic block circuit diagram one of the present utility model；

Accompanying drawing 3 is schematic block circuit diagram two of the present utility model；

Accompanying drawing 4 is schematic block circuit diagram three of the present utility model；

Accompanying drawing 5 is schematic block circuit diagram four of the present utility model；

Accompanying drawing 6 is operation and the display control circuit schematic diagram of the utility model welding machine；

Accompanying drawing 7 is the switching power circuit schematic diagram one of the utility model welding machine；

Accompanying drawing 8 is the switching power circuit schematic diagram two of the utility model welding machine；

Accompanying drawing 9 is the control circuit schematic diagrams such as wire feed and the magnetic valve of the utility model welding machine；

Accompanying drawing 10 is the output characteristics control circuit schematic diagram of the utility model welding machine；

Accompanying drawing 11 is the front plug-in components layout of the large circuit board of the utility model welding machine.

In accompanying drawing, each component names is as follows: 1, handle；2, side cover plate；3, casing；4, power switch；5, draw and do not take off；6, electricity Source line；7, suction nozzle joint；8, magnetic valve；9, blower fan；10, rear board；11, large circuit board；12, large circuit board fixed support； 13, wire feeding disc axle；14, crawl wire feed button；15, dipole inversion post；16, dipole inversion post；17, wire-feed motor；18, welding gun interface Seat copperhead；19, output reactance；20, base plate；21, front panel；22, rapid connector component；23, aviation socket；24, snap joint Plug；25, adjustment of inductance knob；26, voltage-regulation knob；27, electric current or wire feed rate adjusting knob；28, operate and show Control panel.

Detailed description of the invention

As shown in figs. 1-11, the chief component of welding machine includes: 1) wire-feeding part.When specifically including that gas shielded arc welding Wire reel axle 13, wire feeder 17, European gas shield welding welding gun interface copperhead 18 and veneer on wire-feeding control circuit part. Wire feeder 17 and wire feeding disc axle 13 are arranged on internal median septum.Wire feeder 17 is near welding machine front panel 21.Wire feeder 17 carry out corresponding connection with the European gas shield welding welding gun interface copperhead 18 installed on front panel 21.During gas shield welding, gas shield welding is welded Rifle is connected with European gas shield welding welding gun interface copperhead 18.Welding wire is installed on wire reel axle 13.Welding wire can be sent into after installing To wire feeder 17.The welding gun head being attached thereto it is transported to again by European gas shield welding welding gun interface copperhead 18.Pass through wire feed The wire feed rolls of mechanism 17 and contact roller, under the control of circuit, can make welding wire stretch out from the ignition tip of gas shield welding welding gun.Gas shield welding Time, the wire feed rate of welding wire is size-controlled to be controlled in circuit board and corresponding potentiometer.Regulation wire feed rate can change welding The size of electric current.Protective gas interface on European gas shield welding welding gun interface copperhead 18 is connected to electromagnetic gas valve by a tracheae 8.Protective gas is linked into the gas input port of electromagnetic gas valve 8 outside welding machine.After opening gas cylinder, in the control of welder circuit Under effect, electromagnetic gas valve 8 switching can be made, so that protective gas accesses welding gun, and flow out from welding gun head, it is achieved to welding The metal coating in district.During manual welding, wire-feeding part is not controlled.

2) housing portion.Including handle 1, side cover plate 2, casing 3 and base plate 20 etc..

3) plastic front board 10 part afterwards.The parts installed on this rear board mainly have: power switch 4, power supply line 6, power line cannot not draw de-ly also referred to as wire fixer, 5, cooling fan 9, the gas joint of protection gas or the portion such as suction nozzle 7 and electromagnetic gas valve 8 Point.Power line 6 is connected to power supply grid.Power switch 4 controls the on-off of welding machine electric power.Within cooling fan 9 butt welding machine Some parts carry out forced air cooling.Cooling fan 9 is positioned at the rear portion of welding machine, and cold wind is from the air inlet at welding machine case rear board rear portion Hole is carried out.Some heater members or the parts of the first-class part of circuit board 11 can be made, such as IGBT and Heat Sink A heat sink, the most extensive The multiple parts such as diode and radiator are preferably cooled down.Such air channel and type of cooling design, be conducive to ensureing weldering The reliability of dynamo-electric road work, be also the utility model welding machine realize larger current and high capacity water holdup major reason it One.

4) front plastic front board 21 part.The parts installed mainly have: European welding gun interface module copperhead 18, black export Snap joint holder assembly 22, red output snap joint holder assembly 24, aviation socket 23, operation and display control panel 28, hand Work weldering electric current and gas shield welding wire feed rate adjusting knob 27, gas shield welding voltage-regulation knob 26, adjustment of inductance knob 25.In operation With on display control panel 28, 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, the gentle guarantor of manual welding electric current The parts such as weldering wire feed rate regulation potentiometer, gas shield welding voltage-regulation potentiometer, adjustment of inductance potentiometer.

5) base plate 20.Foot pad etc. containing welding machine.

6) control panel 11.Including by input filter circuit, input voltage signal testing circuit, the buffer circuit that powers on, input The inverter main circuit that rectification and filter circuit, four single tube IGBT and inversion main transformer and output rectification, filtering etc. form； Switching power circuit；The control circuits such as inversion PWM and IGBT driving；The control circuit such as wire feed and magnetic valve；Output characteristics controls Circuit；Welding machine operates and shows control circuit interface and corresponding circuit thereof.Between each circuit, according to circuit of the present utility model Schematic diagram relation links together.The every control that can meet manual welding and two kinds of welding methods of MIG/MAG gas shielded arc welding is wanted Ask.Physical circuit and parts thereof are shown in shown in relevant accompanying drawing schematic diagram etc..

The utility model welding machine, during manual electric arc welding, two groups of output snap joint holder assemblies 22,24 are for connecting electricity respectively Soldering turret cable and workpiece clamp cable.Polarity during connection can be according to the kind of welding rod and the mode requiring decision connection.Redness, Represent positive output；Black, represents negative output；During gas shield welding, welding gun is connected to European welding gun interface module copperhead 18.Black exports Snap joint holder assembly 22 is generally used for connecting workpiece clamp welding cable.This connected mode is referred to as reversal connection or reversed polarity connects. Certainly, it is connected respectively to, due to red binding post 15, black binding post 16, the positive and negative polarity that circuit board inverter main circuit exports End, utilizes the two binding post, is exchanged by the wiring position of welding machine internal connecting wire, can realize the positive polarity of welding output Connected mode is changed.Actually use reversal connection or reversed polarity to connect, or use positive polarity connected mode, depend on that gas shield welding is welded The kind of silk and the requirement of welding procedure.

Crawl wire feed of the present utility model switch 14 is crawl wire feed control button, in control circuit when being used for installing welding wire Effect under realize welding wire slowly or intermittent feed, it is simple to welding wire is installed and is allowed to stretch out from welding gun head.

In operation and display control panel 28, it is designed with manual welding and electrogas process switching button and state refers to Show 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 rate regulation potentiometer, gas shield welding voltage-regulation potentiometer, adjustment of inductance potentiometer, ammeter and electricity The parts such as pressure table.Manual welding and gas shielded arc welding power and energy button are used for the selection of two kinds of welding methods, and by referring to accordingly Show that lamp indicates its state；Gas shield welding arc welding gun switch 2T or 4T patten transformation button select for the mode of operation of arc welding gun switch, and Its state is indicated by corresponding indicator lamp.2T pattern refers to press arc welding gun switch, proceeds by gas shield welding welding.Unclamp welding gun to open Guan Ze stops 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 weldering Connect, again press arc welding gun switch, prepare to terminate welding, unclamp arc welding gun switch and then stop welding.Overtemperature protection status indicator lamp is yellow Look or redness then indicate whether superheat state occurs.When internal components temperature is too high, exceedes the operating temperature of temperature relay, Under the effect of control circuit, on the one hand this indicator lamp can be made to light；On the other hand, welding machine can be made to 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 the recovery being reduced to thermal protector is moved When making temperature, protector recovers, and welding machine superheating phenomenon eliminates.Overheating indicator lamp extinguishes.Meanwhile, welding machine can weld again.Manual During weldering, corresponding electric current regulation potentiometer is used to carry out electric current output regulation；During gas shield welding, the size of current of output can pass through phase The wire feed answered or electric current regulation potentiometer are adjusted.Output weldingvoltage is then adjusted by corresponding voltage potentiometer. For improving the arc characteristic of gas shield welding welding, it is additionally provided with electronic inductor or adjustment of inductance potentiometer.The electricity of the composition such as charactron Stream table and voltmeter are then for showing the preset or standard parameter of actual welding.

Operation and display control panel 28 are provided with CON7 and CON1 interface.Two blocks of control circuit plate plates are straight by plug-in unit It is connected together in succession.Accompanying drawing 5 ~ accompanying drawing 9 together constitutes the control circuit schematic diagram that welding machine is complete.

Accompanying drawing 10 is the front plug-in components layout designs figure of the main control large circuit board of the utility model welding machine.Accompanying drawing 11 is the back side SMD components layout designs figure of the main control large circuit board of the utility model welding machine.From accompanying drawing 10 and accompanying drawing 11 Visible, the device in circuit board front is 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 completes circuit board processing.And the device of back of circuit board is mainly SMD electronic devices and components or zero Part, all uses the mode of automatic chip mounting and welding to complete 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 as it The welding machine of its multi circuit board structure is such, has a lot of control connecting lines, then production process will necessarily be many between circuit board, raw Production. art also can be complicated.Visible, the utility model is little because of circuit board size, designs compact conformation, connects control line few, therefore welding machine Board production manufacturing procedure few, manufacture craft is greatly simplified, convenient production.Such design and processing technology, Can ensure that the production of product has the highest production efficiency, meanwhile, error rate and cost of manufacture are low, are conducive to improving the city of product Field competitiveness.

Additionally, at structure design aspect, by median septum, the mainboard electricity of the inside left mechanical part of welding machine with right side Road part is separately.The parts such as the motherboard circuit on right side are equivalent to by median septum, shell, base plate, rear board and front panel composition Shell surrounds.The big electric current strong electromagnetic of isolation, limit electromagnetic radiation can be played, improve the effect of welding machine reliability.

From the point of view of the control function of annex interlock circuit, mainly complete the generation of power supply, pwm pulse width tune Joint, IGBT pipe drive and control and inversion, the inverter circuit output parameter electric current of two kinds of welding methods, Control of Voltage, welding method The work such as selection and control, the regulation of wire feed rate and control.Final under the effect of control circuit, realize manual arc respectively Weldering, every control requirement of MIG/MAG gas shield welding.

The operation principle of the utility model welder circuit is summarized as follows: PCON1 and PCON2 input is connected to power supply electricity Source.Electric network source is connected by the power switch 4 on welding machine rear board.From electrical network come alternating current, first pass through by electric capacity C1 ~ The input filter circuit of the composition such as C4, resistance R1 ~ R2, inductance L1.The Main Function of this circuit is to reduce electric network source to inversion The interference of welder circuit, improves the functional reliability of welding machine.Again through RR1 thermistor, then through DB1 rectifier bridge such as (MDQ50- 08,50A/800V) etc. become Rectified alternating current after rectification.Afterwards, C8 ~ C10 electrochemical capacitor (6800 F/400V) is filled Electricity, voltage gradually rises, and eventually becomes relatively stable+310V direct current.C8 ~ C10 electrochemical capacitor plays the effect of filtering.+ The on the one hand supply of 310V direct current is by Q3 ~ Q4, Q6 ~ Q7 IGBT pipe (such as K75T60 etc.), T1 inversion main transformer and D7 ~ D14 The inverter circuit of the composition such as (such as KD4520 etc.) fast recovery diode, L4 filter reactance, FL1 current divider (220A/75mv).Its Function is mainly :+310V high voltage direct current is converted to intermediate frequency (tens KHz) alternating current.T1 contravariant transformer realizes voltage step-down Conversion with High-current output.D7 ~ D14(such as KD4520 etc.) fast recovery diode be then contravariant transformer output intermediate frequency Convert alternating current is direct current.Current waveform after converting due to it is pulsation, unstable, is unfavorable for the steady of welding process Fixed, therefore, use current filter reactor L4 to be filtered.So, the current waveform of output will become stable.Be conducive to obtaining Obtain high-quality weld seam.On the other hand, see accompanying drawing 4, supply switching power circuit by plug CON1 ,+310V.See accompanying drawing 6, by T3 switching mode power supply transformer, Q30 metal-oxide-semiconductor, D83 and D85 ~ D86 fast diode, the integrated pwm circuit of U16(UC3845) and U18 ~ U19 integrated regulator, and the switching power circuit of the device composition such as resistance around them, electric capacity, produce+5V ,+20V ,+ The supply voltages such as 15V ,+24V ,-15V, supply the live line work such as other corresponding control circuit.About this part of Switching Power Supply Operation principle, makees a brief description here.Accompanying drawing 6 is the schematic diagram of Switching Power Supply.Become with T3 Switching Power Supply by Q30 metal-oxide-semiconductor The armature winding of depressor, and the built-up circuit such as D82 and D84 diode, a lot of resistance and the electric capacity around them.Input electricity Source is connected to HVDC+310V.Thus, UC3845 that Switching Power Supply U16 PWM controls and peripheral resistance thereof, electric capacity composition Circuit belongs to high tension loop.For guaranteeing the safety of control circuit, in figure 6, the PC817 photoelectrical coupler that have employed U17 enters Row isolation.It is U16 that Switching Power Supply PWM controls the kernel control chip of platelet, i.e. UC3845 pwm pulse width adjustor.Outside it The resistance that encloses, 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 pin outputs of U16 chip, can make Q30 metal-oxide-semiconductor in accompanying drawing 6 is in break-make duty.In the voltage follower circuit part of T3 switching mode power supply transformer, respectively Obtain+5V ,+20V ,+15V ,+24V ,-15V ,-20V supply voltage.The device and the circuit work that supply other use.Such as, supply Give operation and display control circuit interface CON7 and accompanying drawing 5 circuit；The supply control circuit such as wire feed and magnetic valve；Supply fan control Circuit processed；The supply control circuit such as inversion PWM and IGBT driving；Supply its output characteristics control circuit etc..Additionally, by switch electricity The circuit of source part and schematic diagram understand, and the utility model does not use the general voltage transformation electricity controlling transformer with being correlated with Road produces above-mentioned several supply voltage.Its circuit power taking is from+the 310V in major loop.The volume of switch transformer and chi Very little, be significantly less weight than general control transformer, this just reduces the cost of the utility model welding machine, and the technology improving welding machine is attached Value added.

In accompanying drawing, K1 pull up time lags behind power switch and closes the moment.I.e. K1 relay is that time delay is moved Make.As C8 ~ C10(6800 F/400V) after charging voltage on electrochemical capacitor is stable, the just action of this relay, its contact closes Closing RR1 thermistor, when making the normal inversion of the utility model welding machine work, big electric current is that the contact from relay flows through.This The circuit of sample, is referred to as the buffer circuit that powers on.Mainly prevent power switch from connecting moment, owing to not having on C8 ~ C10 electrochemical capacitor Voltage, is equivalent to short circuit, can form bigger surge current, burn out power switch.And the effect of the buffer circuit that powers on, it is simply that logical Spending combined floodgate moment seals in RR1 thermistor, carrys out limit inrush currents.Further, the resistance of RR1 thermistor, is with its temperature Rise and increase.Therefore, the buffer circuit that powers on can play preferable protective effect.This buffer portion circuit that powers on is by such as Under control mode realize: in accompanying drawing 4, the control of K1 relay, is by metal-oxide-semiconductor Q1, diode D2, voltage-stabiliser tube D3, resistance The circuit of the composition such as R6 ~ R8, electric capacity C5 realizes.In figure, the formation of+24V voltage can lag behind welding machine power supply switch The moment closed.Voltage on electric capacity C5 is stepped up after+24V voltage adds.Because R6 and C5 constitutes integration electricity Road.When the voltage on electric capacity C5 is increased to certain value, metal-oxide-semiconductor Q1 could turn on.So, K1 relay just can action.

T2 driving transformer, U13 integrated PWM chip (SG3525A) and diode about, voltage-stabiliser tube, resistance, electric capacity Deng composition Q3 ~ Q4, the inversion PWM of Q6 ~ Q7 IGBT pipe, drive circuit and mistake stream and overtemperature protection control circuit part.Q3~Q4、 Q6 ~ Q7 IGBT manages, and the circuit form of two-way drive part is substantially coincident.11 pin and the output of 14 pin due to U13 chip Pwm signal drives power little, therefore needs the driving control circuit through the device such as Q26 ~ Q29, U14 and U15 composition to carry out power Amplify.Isolating transformer is driven to go to control Q3 ~ Q4, the on-off duty of Q6 ~ Q7 IGBT pipe by T2 again.In accompanying drawing 7, 11 pin of U13 chip and 14 pin output control signal are two groups of PWM square-wave pulse signals.The frequency of its square wave is fixing, has Tens KHz.Resistance and capacitance parameter (such as R171 and C83 etc.) that it is connected by RT, CT pin of this chip determine.Two prescription ripple arteries and veins Rushing signal has a regular time poor in time, and specialty is also referred to as Dead Time.It is to ensure that IGBT two groups switch is handed over One of important parameter that temporary substitute is made.This time is that peripheral components (such as R171 and C83 etc.) parameter by U13 chip is arranged and true Fixed.As to how determine, check that the data used in connection with of U13 chip or explanation i.e. can be appreciated that.It is not repeated herein.Here need It is noted that the pwm pulse bandwidth modulation signals of U13 chip output is to determine welding machine inverter main circuit output voltage and electric current The signal of size.Its pulse width depends on: 1) during manual welding state of a control, by welding current Setting signal and output electric current Feedback signal together decides on.The object controlled or target are output size of current.Time unloaded, feedback signal is the least.Control circuit Produce the pwm pulse signal that a dutycycle is bigger, make Q3 ~ Q4, two groups of IGBT of Q6 ~ Q7 be in alternating conductive state, finally make Inverter main circuit output no-load voltage.When operator regulates the potentiometer of welding current on front panel, and when welding, control Circuit processed passes through FL1 current divider (220A/75mv), can detect that output current signal.On the one hand, it is thus achieved that welding current table shows Output current signal.Under the effect of other control circuit (operation of the most attached Figure 4 and 5 part and display control circuit) Realize the display of current digital display table.On the other hand, the current signal detected, at other control circuit (mainly accompanying drawing 4 Output characteristics control circuit with 9 parts) effect under, process through signal amplification etc., and in this, as Current Negative Three-Point Capacitance control Signal processed, compares with welding current Setting signal.Difference signal after Bi compare, carries out PI(ratio and integration) regulation control System, the pulse width of the output control welding machine output PWM chip of its output or dutycycle, decision welding machine output electric current and voltage Size, it is achieved the accurate control of output current parameters.And to make the output characteristics of welding machine be the dropping characteristic dragged outside constant current band.Enter one Step ground is said, when welding current Setting signal is constant, the electric current detected along with welder circuit increases, and, reach given After setting value, welding current Setting signal can reduce with electric current increase with the difference of current feedback control signal, passes through PI After control, making the pulse width of welding machine output PWM chip or dutycycle reduce, the output voltage of welding machine reduces.This process, also It is exactly that so-called Current cut-off negative feedback controls.I.e. only just work after electric current reaches the setting value of welding current potentiometer FEEDBACK CONTROL.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 reduction of voltage, control circuit can make the pulse width of welding machine output PWM chip or dutycycle increase, make welding current according to setting Fixed parameter increases, and ultimately forms the dropping characteristic dragged outside constant current band.When welding current Setting signal changes, current cut-off is born Feedback setting value is different, but other control process is similar.So, between the minimum and maximum that potentiometer sets, just Can obtain without several negative characteristic curves.Such control, is also the basic demand meeting manual arc welding.2) gas shield welding control During state processed, weldingvoltage Setting signal together decide on output voltage feedback signal etc..The object or the target that control are defeated Go out voltage swing.Negative voltage feedback PI is used to control.Time unloaded, control similar with manual welding, remain the PWM arteries and veins that output is bigger Rush width signal, it is thus achieved that floating voltage.After bringing onto load, then different with the control of manual welding.Gas shield welding, the output of welding machine is special Property control be the dropping characteristic dragged outside flat characteristic rather than constant current band.It is characterized in: load current changes greatly, and exports electricity Pressure varies less, and keeps relative stability.Only when voltage Setting signal changes, the voltage of output just there will be bigger change Change.More than control process, realized by corresponding control circuit.

L3 is a current detector, can detect in inverter main circuit, the primary current signal of main transformer.Its output LP1 and LP2 delivers to the control circuit (shown in accompanying drawing 7) such as inversion PWM and IGBT driving.Mainly whether check inverter main circuit There is over-current phenomenon avoidance.If there is crossing stream, the stream indicator lamp VD1 that crosses in accompanying drawing 7 lights；VS1(SCR IGCT) conducting, D77 bis- The cathode potential of pole pipe is pulled low to low level (GND), and triode Q24 ends, and Q25 turns on, the output of U13 chip 11 and 14 pin Pwm signal is closed, and the drive control signal of 4 IGBT of welding machine inverter main circuit is closed, and welding machine cuts out output.Meanwhile, panel mistake Heat instruction D73 light emitting diode is lighted, and OC/OT end also sends corresponding signal.

The control circuit parts such as inversion PWM and IGBT driving, its output G1 and E1, G2 and E2 are respectively two groups of pwm pulses Signal, goes to control Q3 ~ Q7 and the switching state of two groups of IGBT switches of Q4 ~ Q6 in inverter main circuit respectively.The arteries and veins of this pwm signal Rush width to be controlled by PWM-GD input Setting signal.With or without pwm signal, then depend on PWM-STOP and Tc.Such as, in accompanying drawing 4 Tc connect CON8 interface signal be heat alarm.CON8 interface is connected to the temperature relay of open type.And temperature relay Device is close to again on the aluminium alloy heat radiator of Q3 ~ Q7 IGBT or D7 ~ D14 output fast recovery diode.When temperature relay moves When making, show main power device generation superheating phenomenon.Now, in accompanying drawing 7, Tc current potential is pulled low to low level (GND), meanwhile, OC/OT end sends corresponding signal to CON7 interface circuit, makes panel overheated instruction D6 light emitting diode light, and control circuit will be closed Close pwm signal.Prevent welding machine from burning out because of overheated.Under the effect of (being connected to CON6 interface) cooling blower, work as aluminium alloy After dropping to a certain degree at a temperature of radiator, the superheating phenomenon within welding machine eliminates, and when thermal protector recovers, control circuit is Pwm control signal can be continued to put out.Overheating indicator lamp (yellow) extinguishes simultaneously.Which achieves welding machine overtemperature protection.PWM- STOP is then from output characteristics control circuit (being also shown in shown in accompanying drawing 9) part.When welding machine not output voltage or electric current, PWM- STOP signal can close pwm signal, makes Q3 ~ Q7 and two groups of IGBT switches of Q4 ~ Q6 in inverter main circuit be off state.

CON7 interface section is connected to operation and display control circuit.U1 chip (GC7139C) controls voltage display number Pipe.Its input UDP signal magnitude decides the display data of voltmeter.RV1 is voltage display data and virtual voltage data Correction trimmer potentiometer.U2 chip (GC7139C) controls electric current display charactron.Its input IDP signal magnitude decides electric current The display data of table.RV2 is the correction trimmer potentiometer of electric current display data and actual current data.MMA/EN is by manual welding (MMA)/gas shield welding (MIG/MAG) welding method select button S2 operation circuit controls to determine.Its circuit is by U3(CD4013) core Sheet, triode Q5 and button S2, and the composition such as the resistance of periphery, electric capacity.This control circuit, the control that welding machine is started shooting after powering Default conditions are: MMA/EN is low level, i.e. MIG/MAG gas shield welding state of a control.Meanwhile, Q4 triode ON, D7 luminescence two Pole pipe MIG/MAG indicator lamp is lighted.Afterwards, when pressing a S2 button, MMA/EN becomes high level, meanwhile, and Q2 triode Conducting, D3 light emitting diode MMA indicator lamp is lighted.Again press S2, then state can overturn again.4T/EN state is welded by 2T/4T Rifle switched operating mode select button operation circuit controls to determine.Its circuit is by U(CD4013) 4 chips, triode Q6 and button S1, 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 For low level, i.e. MIG/MAG gas shield welding 4T state of a control.Meanwhile, Q3 triode ON, D2 light emitting diode 4T indicator lamp point Bright.Afterwards, when pressing a S1 button, 4T/EN becomes high level, and meanwhile, Q1 triode ON, D8 light emitting diode 2T refers to Show that lamp is lighted.Again press S1, then state can overturn again.(it is also shown in attached from control circuits such as inversion PWM and IGBT drivings Shown in Fig. 7) OC/OT signal deciding whether overheating indicator lamp D6 lights.RV4 is that voltage gives, Ug and UgL is connected to this electricity The given potentiometer of pressure.RV3 is given value of current, Ig and IgL is connected to this given value of current potentiometer.RV5 is that inductance gives, di/dtb Being connected to this inductance with di/dta and give potentiometer, its relevant circuit is equivalent to electronic inductor, can change welding arc Characteristic, splatter when improving appearance of weld and reduce welding.(also may be used from control circuits such as inversion PWM and IGBT drivings As shown in accompanying drawing 7) Ich signal also can affect unit of display indicator lamp and the ammeter decimal point state of current digital display table.Example As, under manual welding.Now, MMA/EN becomes high level, Q2 triode ON, and D3 MMA indicator lamp is lighted.D1 indicator lamp is also Being bright, " V " unit indicator lamp is lighted.Q7 triode ON, D11 light emitting diode " A " unit indicator 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 shows preset welding current and floating voltage.If welded condition, then can make circuit display actual welding electric current and weldering Connect voltage.In manual welding state, " D14 " m/min indicator lamp will not be lighted.Under gas shield welding, the result of control can be " D14 " m/min indicator 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), given value of current according to voltage Potentiometer (relevant to Ig and IgL), inductance give the set-point of potentiometer (being correlated with di/dtb and di/dta), and are to select Manual welding or gas shield welding (relevant to MMA/EN etc.), also from output loop current divider FL1(220A/75mv) electric current Feedback signal If-and If+, voltage feedback signal Uf+, and from the control circuit such as wire feed and magnetic valve (see accompanying drawing 8 circuit part Point) signal and the state such as P/MMA, determine that welding machine is (with PWM-STOP signal or heat alarm Tc without output voltage or electric current Deng closing, pwm signal is relevant), still there are output voltage or electric current (having pwm signal to export, relevant with PWM-GD etc.)；It it is display Preset electric current and voltage parameter, or the situation such as the electric current of display reality and voltage parameter is (with Ich, MMA/EN1, SWLOCK Level controling signal is relevant)." Voltage " signal from actual voltage feedback signal, be through operational amplifier U5D and Peripheral circuit processes, and represents the output voltage size of reality；" Current " signal from actual current feedback signal, Process through operational amplifier U5A and peripheral circuit thereof, represent the output voltage size of reality.U12 chip is multichannel Electronic switch.The data mainly controlling display are unloaded and preset parameters, or the weldingvoltage of reality and current data. Such as, when Ich, MMA/EN1, SWLOCK level controling signal state makes 3 pin of U12C and 4 pin connect, the data of IDP output It is " Current " signal, the size of current of i.e. actual output.Meanwhile, 13 pin and 14 pin of U12A are also to turn on state, UDP The data of output are " Voltage " signals, the voltage swing of i.e. actual output.Otherwise, (meanwhile, 5 pin of U12C and 4 pin are connected 15 pin and 2 pin of U12B are also connected) time, the data of IDP output are the signals from " Ig ", the most preset given size of current. Similarly, 12 pin of U12A and 14 pin in an ON state time, UDP output data from " Ug " signal, be i.e. preset to Fixed voltage swing.MMA/EN level state, already mentioned above, and have selected manual welding or gas shield welding is relevant.When When selecting MIG/MAG gas shield welding, MMA/EN is low level；When selecting manual welding, MMA/EN is high level.Can from accompanying drawing 9 To find out, when MMA/EN is high level, MMA/EN1 is+24V high level.Otherwise, during gas shield welding, MMA/EN1 is then low electricity Flat.Under gas shield welding, owing to MMA/EN1 is low level, triode Q20 ends, and the lumination of light emitting diode of U10 optocoupler, in it Portion's triode ON, makes the input signal of R128, namely this road invalidating signal of given value of current.I.e. Ig potentiometer during gas shield welding Inoperative.Under manual welding state, P/EN is high level, triode Q21 can be made to turn on, by the pincers of D58 and D59 diode Position, makes Ug1 point current potential be pulled to relatively low level, i.e. its effect to be: during manual welding, Ug potentiometer is inoperative.

The pwm pulse bandwidth modulation signals of PWM-GD output 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-GD pulse signal that a dutycycle is bigger, makes Q3 ~ Q4, two groups of IGBT of Q6 ~ Q7 be in maximum conducting state, Make inverter main circuit output no-load voltage eventually.When operator regulate Ig give electric current and weld time, control circuit is passed through FL1 current divider (220A/75mv) detects output electric current If-and If+ feedback signal.After U5A and peripheral circuit thereof process, On the one hand, it is the output current signal that " Current " obtains that welding current table shows by circuit conversion, and realizes current digital The display of display table.On the other hand, the current feedback signal after detection is amplified gives Ig signal with welding current and compares.Ratio Difference signal after relatively, through the electric current PI(proportional+integral that rear class operational amplifier U6B etc. forms) control circuit, its output Result PWM-GD control the welding machine output pulse width of PWM chip or dutycycle, determine the big of welding machine output electric current and voltage Little, it is achieved the accurate control of output current parameters.And to make the output characteristics of welding machine be the dropping characteristic dragged outside constant current band.Further Ground is said, when welding current give Ig signal constant time, along with current feedback If-detected and the increase of If+ signal, and reach After the setting value of given Ig, welding current Setting signal can subtract with electric current increase with the difference of current feedback control signal Little, after controlling, make the pulse width of welding machine output PWM-GD 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 have after electric current reaches the setting value of welding current potentiometer The FEEDBACK CONTROL just worked.Hereafter, along with the increase that electric current is small, voltage reduces can be a lot.When voltage drops to below 16V Time, along with the reduction of voltage, control circuit can make the pulse width of welding machine output PWM chip or dutycycle increase, and makes welding electricity Flow and increase according to the parameter set, ultimately form the dropping characteristic dragged outside constant current band.When welding current Setting signal changes, electricity Stream cut-off negative-feedback setting value is different, but other control process is similar.So, the minimum and maximum set at potentiometer Between, so that it may obtain without several negative characteristic curves.Such control, is also the basic demand meeting manual arc welding.2) During gas shield welding state of a control, weldingvoltage give Ug signal and together decide on output voltage feedback signal Uf etc..Control is right As or target be output voltage size.The circuit using the compositions such as operational amplifier U5C carries out negative voltage feedback PI 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.It can be seen that change inductance to give the set-point of potentiometer from accompanying drawing 9, di/dtb and di/dta can change, this To affect PWM-GD signal, eventually change the characteristic of welding arc.

The control circuit part such as wire feed and magnetic 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, can be real Existing wire feed, supply gas, welding process etc. controls)；(CON3 socket, when GAS interface end level is low for the GAS signal of control magnetic valve Time, it is connected to the electromagnetic gas valve action of CON3, can realize protecting the break-make of gas to control)；Control signal MOT-of wire feeding motor and MOT+(CON4 socket, when having output voltage when between the two terminal, connects the wire feeding motor operating of so far interface, can realize sending Silk controls)；The parts such as given value of current signal (relevant to Ig and IgL) and 2T/4T state control signal.U2 is CD4013 chip； U3 is CD40106B chip.MOT+ and MOT-interface is connected to the wire feeding motor that rated voltage is 24V.Wire feeding motor belongs to accompanying drawing A part of wire-feed motor (17) in 1.When wire feeding motor rotates, welding wire is driven to be transported to welding gun.Before realizing welding Wire feed action when welding wire is installed and welded.

It is pwm pulse width modulator that wire feed controls U4 chip TL494.It is with a lot of diode, resistance and electricity outside it The devices such as appearance.Its 8 and 11 pin output produces the square-wave pulse signal of fixed frequency.Frequency and Dead Time are by R46 and C33 certainly Fixed.The pwm control signal of 8 pin of U4 and the output of 11 pin goes to control Q14 MOS after the circuit that D33 and D34, Q13 etc. form Pipe.By controlling the make-and-break time of Q14 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.D37 Diode group is fly-wheel diode, the back-emf of the elimination wire feeding motor adverse effect to Q14.R58, Q2 metal-oxide-semiconductor and control thereof Circuit, constitutes the dynamic braking control circuit of wire feeding motor.When the input (13 pin) of U3F is low level, the output of U3F (12 pin) output high level.Now, Q2 turns on, and connects resistance R58, makes the energy stored on motor winding release quickly through R58 Put, so that wire feeding motor quickly stops operating.So, welding wire is just unlikely and can stretch out welding gun head gas shield cover too much, The normal operating of impact welding.

When gas shield welding controls, SWLOCK is low level.1 pin of U3A, 2 pin, 4 pin 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 triode Q10 turn on, the cathode potential of D21 diode be pulled low to low level " ".The clamping action of D21,9 pin making U3D are low electricity Flat, 8 pin of U3D, namely the 4 pin R(of U2A reset) hold as high level.The 1 pin Q output of U2A is low level.Now, if Arc welding gun switch SWA and SWB closes, then 1 pin of U3A becomes low level, and 2 pin become high level, and 4 pin become low level.The height of 2 pin Level makes 12 pin of U3F be low level, and FET Q2 does not turns on, and wire feeding motor energy-dissipating brake circuit disconnects.Meanwhile, D28 Negative electrode be high level, on the one hand making GAS/EN is high level, on the other hand, makes Q9 turn on, and voltage-stabiliser tube D18 punctures, voltage stabilizing, Q8 FET turns on, GAS terminal connection+24V, and electromagnetic gas valve action can make protective gas be transported to the welding of welding gun termination District protects.Owing to there being wire feed to give Ig, under the effect of TL494 and peripheral circuit thereof, the 8 and 11 pin outputs of TL494 Square-wave pulse pwm control signal goes to control Q14 metal-oxide-semiconductor after the circuit that D33 and D34, Q13 etc. form.By controlling Q14 The make-and-break time of metal-oxide-semiconductor, thus control the rotating speed of wire feeding motor.Afterwards, electric arc is ignited, and welding process proceeds by.Welding During, 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 arteries and veins Width, the final size changing wire feed rate.It is actually the size changing welding current.After unclamping arc welding gun switch, U3A's 1 pin becomes high level, and 2 pin become low level, and 4 pin of U3B become high level.The low level of 2 pin makes 12 pin of U3F be high electricity Flat, FET Q2 turns on, and wire feeding motor energy-dissipating brake circuit is connected, and wire feeding motor does not rotates, and stops wire feed.Meanwhile, D28 Negative electrode is low level, and on the one hand making GAS/EN is low level, on the other hand, makes Q9 end, and voltage-stabiliser tube D18 will not puncture, voltage stabilizing, Q8 FET is not turned on, and 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.Q10 triode 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 pin of U3A becomes low level, and 2 pin become high level, and 4 pin become low level.The high level of 2 pin makes 12 pin of U3F be Low level, FET Q2 does not turns on, and wire feeding motor energy-dissipating brake circuit disconnects.Meanwhile, the negative electrode of D28 is high level, one Aspect makes GAS/EN be high level, on the other hand, makes Q9 turn on, and voltage-stabiliser tube D18 punctures, voltage stabilizing, and Q8 FET turns on, GAS Terminal 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 having Wire feed gives Ig, and under the effect of TL494 and peripheral circuit thereof, the square-wave pulse PWM of the 8 and 11 pin outputs of TL494 controls letter Number through D33 and D34, Q13 etc. composition circuit after go control Q14 metal-oxide-semiconductor.By controlling the make-and-break time of Q14 metal-oxide-semiconductor, Thus control the rotating speed of wire feeding motor.Electric arc is ignited afterwards, and welding process proceeds by.Ich terminal is high level.The 9 of U3D Pin is high level, 8 pin of U3D, and namely 4 pin (R reset terminal) of U2 are low level.After unclamping arc welding gun switch, 1 pin of U3A Becoming high level, 2 pin of U3A become low level, and 4 pin of U3B become high level.The CLK end making U2A produces rising edge pulse, Make the Q end output high level of U2A.12 pin making U3F are low level, and FET Q2 is not turned on, wire feeding motor dynamic braking electricity Road disconnects, and wire feeding motor rotates, and proceeds wire feed.The negative electrode of D28 is high level simultaneously, and on the one hand making GAS/EN is high electricity Flat, on the other hand make Q9 turn on, voltage-stabiliser tube D18 punctures, voltage stabilizing, and Q8 FET turns on, GAS terminal connection+24V, electromagnetism gas Valve continues holding action, and protective gas continues conveying.When, after the arc welding gun switch that again closes, 1 pin of U3A becomes low level, U3A's 2 pin become high level, and 4 pin of U3B become low level.The CLK end making U2A produces trailing edge pulse.Due to welding current still Existing, Ich is high level, and 9 pin of U3D are high level, and its 8 pin level is also that the R reset terminal level of U2A continues to keep low electricity Flat.This just makes the output Q end of U2A remain in that original high level state.12 pin making U3F are low level, FET Q2 Being not turned on, wire feeding motor energy-dissipating brake circuit disconnects, and wire feeding motor rotates, and proceeds wire feed.The negative electrode of D28 is high electricity simultaneously Flat, on the one hand making GAS/EN is high level, on the other hand makes Q9 turn on, and voltage-stabiliser tube D18 punctures, voltage stabilizing, and Q8 FET 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 pin of U3A becomes high level, and 2 pin of U3A become low level, and 4 pin of U3B become high level.The CLK end making U2A produces and rises Along pulse.Owing to welding current yet suffers from, Ich remains high level, and 9 pin of U3D remain high level, and its 8 pin level is also It it is the R reset terminal level continuation holding low level of U2A.The Q end output making U2A is low level by high level upset.Make the 12 of U3F Pin is high level, and FET Q2 turns on, and wire feeding motor energy-dissipating brake circuit is connected, and wire feeding motor stops operating, and wire feed stops. The negative electrode of D28 is low level simultaneously, and on the one hand making GAS/EN is low level, on the other hand makes Q9 end, and voltage-stabiliser tube D18 will not hit Wear, voltage stabilizing, Q8 FET is not turned on, and GAS terminal will not connect+24V, electromagnetic gas valve stopping action, and protective gas stops defeated Send.Welding process terminates.

Crawl wire feed controls: when selecting MIG/MAG gas shield welding, and when pressing the crawl wire feed button (accompanying drawing in accompanying drawing 3 In 1 14) time, when SS/EN terminal connects+15V high level, carry out crawl wire feed operation.Now, 13 pin of U3F are high level, 12 pin are low level, and FET Q2 does not turns on, and wire feeding motor energy-dissipating brake circuit disconnects.Meanwhile, the negative electrode of D28 is low electricity Flat, on the one hand making GAS/EN is low level, on the other hand, makes Q9 be not turned on, and voltage-stabiliser tube D18 will not puncture, voltage stabilizing, Q8 field-effect Pipe is not turned on, and GAS terminal is not turned on+24V, and electromagnetic gas valve is failure to actuate, and protective gas cannot carry.Due to by D31 bis-pole Pipe has voltage to be added to R52.Now, have certain wire feed to give setting value and be input to the IN-input of TL494, at TL494 and Under the effect of peripheral circuit, 8 and 11 pin of TL494 export certain square-wave pulse pwm control signal, through D33 and D34, Q13 Go after circuit Deng composition to control Q14 metal-oxide-semiconductor.By control Q14 metal-oxide-semiconductor make-and-break time so that wire feeding motor according to The control rotational speed set, drives welding wire to be sent into.Thus realize crawl wire feed process control.The operation of crawl wire feed can make welding wire Certain length is stretched out, about about 10mm from welding gun head.During crawl wire feed, magnetic valve is failure to actuate, and welding machine is 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, it 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 8, 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 pin that can make U3A is high level, and 2 pin are low level, and 4 pin 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 the 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 the 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, the 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.The 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 the 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 concept of the premise utility, it is also possible to make some other deduction and conversion, These all should be considered as belonging to the category of the utility model protection.

Claims (5)

1. a structure for two welding function IGBT inverter type welders, including housing, rear board and front panel, it is characterised in that: its Internal structure uses left-right layout design, and side, the left side is disposed with wire feeder and reactor, and its wire reel axle is arranged on inside On median septum, wire feeder is arranged on base plate, near welding machine front panel, and with the European gas shield welding welding gun installed on front panel Seat links together；The right opposite side arranges large circuit board, cooling blower；By the internal median septum of welding machine, the inside of welding machine Mechanical part separates with the primary control circuit plate part on the left side, the primary control circuit plate part on its left side be equivalent to by every The metal shell of plate, shell, base plate, rear board and front panel composition surrounds, and can play isolation electromagnetic interference, prevent electromagnetic radiation Effect, cooling blower forms cooling air channel with the radiator on the large circuit board of the right, IGBT pipe and fast recovery diode；Circuit Plate is designed as two pieces, one of for showing and operation control panel, plate is designed with six charactrons and display controls electricity Road, is divided into two groups, shows electric current and voltage parameter, also manual welding/gas shielded welding method switching button, gas shield welding 2T/4T respectively Arc welding gun switch mode of operation select button, the unit indicator lamp of voltage, electric current and wire feed rate, overheating indicator lamp, and electric current, Voltage and electronic inductor inductance parameters set regulation potentiometer；Another block large circuit board, the two-sided layout of its electronic devices and components, two Circuit connection is carried out by a plug-in unit and a small amount of connecting line between block circuit board.

A kind of structure of two welding function IGBT inverter type welders, it is characterised in that: described operation Use two panels GC7139C control chip to be the circuit of core with display circuit board part, control often to organize the charactron of 3 respectively, For showing voltage, electric current or wire feed rate parameter, coordinating control circuit, ammeter and the voltmeter of charactron composition can be distinguished Show the preset or standard parameter of actual welding；Two panels CD4013 control chip is the circuit of core, respectively constitutes manual welding/gas Shielded welding method selects, gas shield welding 2T/4T arc welding gun switch mode of operation selects control circuit.

A kind of structure of two welding function IGBT inverter type welders, it is characterised in that: described operation Be also devised with manual welding and gas shielded welding method switching button and status indicator lamp, gas shield welding arc welding gun switch on display circuit board 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 Regulation potentiometer, gas shield welding voltage-regulation potentiometer, adjustment of inductance potentiometer circuit part.

A kind of structure of two welding function IGBT inverter type welders, it is characterised in that: described big electricity The electronic devices and components of road plate use two-sided layout, and a small amount of large-sized device layout is in front, and large-sized device relies primarily on Manual work mode completes assembling and welding, and substantial amounts of electronics surface-mounted device layout is at the back side of large circuit board, according to automated manner It is processed, the circuit on this circuit board, divides by function, be designed with: by input filter circuit, input voltage signal detection electricity Road, the buffer circuit that powers on, input rectifying and filter circuit, four single tube IGBT and inversion main transformer and output rectification, filter The inverter main circuit of wave component；Switching power circuit；Inversion PWM and IGBT drives control circuit；Wire feed and magnetic valve control electricity Road；Output characteristics control circuit；Welding machine operates and shows control circuit interface and corresponding circuit thereof.

A kind of structure of two welding function IGBT inverter type welders, it is characterised in that: after described The parts installed on plate mainly have power switch, band plug power supply line, cooling blower, protection gas suction nozzle and electromagnetism gas Valve, the cold wind air admission hole from welding machine case rear portion enters, and some heater members or parts on circuit board can be made to have good cold But effect.