CN205324948U - Accord with IGBT contravariant argon arc that EMC required weld with manual metal -arc welding machine structure - Google Patents
Accord with IGBT contravariant argon arc that EMC required weld with manual metal -arc welding machine structure Download PDFInfo
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- CN205324948U CN205324948U CN201521101441.7U CN201521101441U CN205324948U CN 205324948 U CN205324948 U CN 205324948U CN 201521101441 U CN201521101441 U CN 201521101441U CN 205324948 U CN205324948 U CN 205324948U
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Abstract
The utility model relates to an accord with IGBT contravariant argon arc that EMC required weld with manual metal -arc welding machine structure, welding machine circuit board has two, the welding of little control panel is on big control panel, whole control circuit is mainly by the input filter circuit, the contravariant main circuit, output filter circuit, switching power supply circuit, IGBT's drive circuit, current detection and rectification transfer circuit, heat protection detection and control circuit, the preset circuit of electric current, solenoid valve control circuit, striking current control circuit, ten functional circuits such as output characteristic control circuit are constituteed, little control panel circuit mainly is output characteristic control circuit, and its core comprises 3846 PWM pulse width modulation chips and peripheral device, the utility model discloses have: input two -stage filtering, output filtering, IGBT switch and output Rectifier is anti -interference and electromagnetic shield measure in addition, the utility model provides a lot of these type of welding machines can't be through EMC internationally certificated's problem, therefore have better market adaptability.
Description
Technical field
This utility model relates to oneMeet the EMC IGBT inversion argon arc welding required and manual arc welder structure,Belong to inverter type welder technical field。
Technical background
At present, the competition in contravariant argon arc welding and manual metal-arc welding dual-purpose machine product market is very fierce, is not only embodied in advance and the advantage of technology, the aspect such as function and design of also depending greatly on welding machine。
On domestic and international market, the rated current of small-sized metal-oxide-semiconductor, IGBT pipe contravariant argon arc welding and the dual-purpose machine of manual metal-arc welding is generally at 80 ~ 200A(cyclic duration factor 100 ~ 15%) level。But this type of welding machine product most all cannot be detected and certification by EMC performance, a lot of products even also cannot pass through security credential, only meets the welding requirements of manual metal-arc welding。Its products export can be subject to certain restrictions。The country requiring that welding machine meets EMC performance and authentication requesting cannot be exported to, such as the U.S., Australia, Canada, European Union etc.。
For meeting the welding machine of the certification such as EMC and safety, owing to its performance is better, thus the scope of its selling market and application can be wider。Production marketing can more added with the market competitiveness。But, this type of welding machine, different circuit, circuit board and complete machine structure design, control principle is different with mode, and circuit board is different with the layout of complete machine, and the safety of its product, EMC Electro Magnetic Compatibility, the operation of production and processing technology etc. also can be entirely different。These all can affect performance and the cost of product。Therefore, how under the premise of low cost, exploitation performance meets the welding machine of above-mentioned authentication requesting certain technical difficulty。This is also the problem that this utility model needs to solve。
Utility model content
The purpose of this utility model is in that to provide oneMeet the EMC IGBT inversion argon arc welding required and manual arc welder structure, welder circuit plate is designed as two pieces, and little panel is welded on big panel, and this utility model mainly has: 1) input two stage filter；2) output filtering；3) IGBT switch and output rectification are anti-interference；4) electromagnetic shielding etc., above-mentioned measure is to ensure that welding machine product of the present invention can pass through the important prerequisite of internal authority mechanism EMC performance and safety detection and certification, this utility model optimizes the cost of above-mentioned welding machine, improving product competitiveness in the market, the circuit theory of this utility model welding machine, circuit board and complete machine structure etc. design the unique distinction having oneself。
For achieving the above object by the following technical solutions:
A kind of IGBT inversion argon arc welding meeting EMC requirement and manual arc welder structure, including housing portion, front-facing portion, rear board part and panel part, it is characterized in that: described panel part mainly includes input filter circuit, inverter main circuit, output filter circuit, switching power circuit, the drive circuit of IGBT, current detecting and rectification transformating circuit, Thermal protection detection and control circuit, given value of current circuit, solenoid valve control circuit, striking current control circuit, these ten functional circuits of output characteristics control circuit, between each circuit, circuit connects, panel part is divided into two pieces of big panels and little panel, wherein output characteristics control circuit layout is on little panel, other circuit then layout is on big panel；The large circuit board of panel part stands on the base plate being arranged on housing parts, and panel part is divided into two pieces, and little panel is directly welded on big panel by plug-in unit；
On little panel, there is output characteristics control circuit in primary placements, and output characteristics control circuit is by U2PWM pulse width modulation chip (UC3846), tetra-operational amplifiers of U1, and the device such as a lot of resistance of these device periphery, electric capacity and diode composition。
Described big panel is provided with input two stage filter circuit, output filter circuit, IGBT switch and output rectification anti-jamming circuit。
Housing portion includes shell and base plate。
Described rear board part is provided with: on and off switch, the connection argon inlet mouth of electromagnetic valve, power supply line and plug, wire fixer, rear plastic panel, cooling fan；Power line and plug are connected to power supply grid, on and off switch (5) controls the on-off of welding machine electric power, cooling fan is positioned at the rear portion of welding machine, and cold wind carries out from the air inlet at welding machine rear portion, and some heater members of left side circuit part or parts can be made to be cooled down preferably。
Described front-facing portion is provided with: plastic front panel or front cover, two groups of output snap joint holder assemblies, connection the argon outlet nozzle of argon-arc welding gun, working power display lamps) and Thermal protection status indicator lamp, manual welding electric current output regulator potentiometer, connect welding clamp cable and workpiece clamp cable respectively when two groups of output snap joint holder assemblies are for manual electric arc welding；Working power display lamp instruction power on；Thermal protection status indicator lamp then indicates whether superheat state occurs, and when internal components temperature is too high, when exceeding operating temperature, under the effect of control circuit, this display lamp can be made to light on the one hand；On the other hand, welding machine can be made to stop welding or output。
Above-mentioned measure is to ensure that the welding machine product made based on circuit of the present invention can pass through the important prerequisite of the detection of EMC internal authority mechanism performance and certification。It should be understood that there is not above-mentioned filter circuit just can solve EMC problem。Further relate to design and the select permeability such as components and parts and the parameter of parts, material, position in filter circuit。Such as, the selection of the core material of filter inductance and umber of turn；The selection of capacitance parameter；The position etc. of filter arrangement, all can produce impact to the detection of EMC performance。
This utility model welding machine that different current classes and cyclic duration factor are required, can pass through to adjust a small amount of amount of parts and specifications parameter on circuit board, form the product of difference output rated current and cyclic duration factor, make product seriation。Such as, the number of big electrochemical capacitor is changed；Change rectifier bridge parameter；Change current class and the heat sink size of IGBT device；Change model and the parameter of fast recovery diode；Change specification and the parameter etc. of inversion main transformer and output filter reactor, can easily form the series of products of different size。Such as 200A/28V(25%, cyclic duration factor, lower with), 180A/27.2V(35%), 160A/26.4V(45%), 140A/25.6V(50%), 120A/24.8V(60%), 100A/24V(80%), 80A/23.2V(100%) product of multiple current class and specifications and models。Rated current is more little, then rated duty cycle is more high。Certainly, these changes, it is therefore an objective to make the cost of manufacture of product match with the specifications parameter of corresponding machine and performance indications。So, the welding machine of every kind of specifications and models could realize optimized cost control。This just improves the market competitiveness of institute's development。
This utility model welding machine is owing to having good EMC Electro Magnetic Compatibility and safety Design, solve the problem that this type of welding machine a lot of cannot pass through EMC certification, thus welding machine has better market adaptability, its good circuit and structural design thereof are also advantage places of the present utility model, be also meet efficiently and low-cost production, high reliability, manufacturing technology advance important leverage。
Accompanying drawing explanation
Accompanying drawing 1 is the explosive view of this utility model welding machine。
Accompanying drawing 2 is the circuit theory diagrams of this utility model welding machine；
Accompanying drawing 3 is the PCB components' placement figure of the big panel of this utility model welding machine；
Accompanying drawing 4 is the PCB components' placement figure of the little panel of this utility model welding machine。
Detailed description of the invention
As Figure 1-4,A kind of IGBT inversion argon arc welding meeting EMC requirement and manual arc welder structure, its key component includes:
1) housing portion。Including shell 2, braces 1, base plate 11, shell screw etc.。
2) rear board part。The parts installed on rear board 10 mainly have: the parts such as on and off switch 5, the connection argon inlet mouth 4 of electromagnetic valve, power supply line and plug 7, wire fixer 6, rear plastic panel 8, cooling fan 9。Power line and plug 7 are connected to power supply grid。On and off switch 5 controls the on-off of welding machine electric power。Cooling fan 9 is positioned at the rear portion of welding machine, and cold wind carries out from the air inlet at welding machine rear portion。Some heater members or the parts of left side circuit part can be made, as the parts such as IGBT and Heat Sink A heat sink, fast recovery diode and radiator are cooled down preferably。Such air channel and type of cooling design, be conducive to ensureing the reliability of welder circuit work, is also one of this utility model welding machine major reason of realizing larger current and high capacity water holdup。
3) front-facing portion。The parts installed on welding machine front panel mainly have: plastic front panel or front cover 12, output snap joint holder assembly 13, output snap joint holder assembly 14, connection the argon outlet nozzle 15 of argon-arc welding gun, working power display lamp 18, and Thermal protection status indicator lamp 17, manual welding electric current export the parts such as regulator potentiometer 16。Two groups of output snap joint holder assemblies 13,14 connect welding clamp cable and workpiece clamp cable when being used for manual electric arc welding respectively；Working power display lamp 18 indicates power on。Thermal protection status indicator lamp 17 then indicates whether superheat state occurs。When internal components temperature is too high, when exceeding operating temperature, under the effect of control circuit, this display lamp can be made to light on the one hand；On the other hand, welding machine can be made to stop welding or output。When welding machine does not export, the cooling effect of blower fan can make the temperature of device reduce。When being reduced to recovery action temperature, welding machine superheating phenomenon eliminates。Overheating indicator lamp extinguishes。Meanwhile, welding machine can weld again。Certainly, the needs according to production, front panel 12 also can arrange the parts such as ammeter, voltmeter, with the function of extended products or performance。
4) panel part。Including a lot of parts on panel 3 and this panel。Such as, IGBT(4 is only) and fin, CBB475K/400V electric capacity, the big electrochemical capacitor of 470uF/400V, little control (PCB circuit) plate, 2C3 electric capacity, 2MT1 inductance, 2MT2 inductance, driving transformer, current transformer or electric current loop, rectifier bridge and radiator, switching mode power supply transformer, 24V relay, integrated regulator 7815, metal-oxide-semiconductor IRFZ24N and IRF9Z24N, output filter reactor, fast recovery diode or rectifier tube and the part such as radiator, inversion main transformer thereof。Little panel also has a lot of electronic devices and components, such as 3846PWM control chip, operational amplifier, resistance, electric capacity etc.。
Circuit board controls part and the components and parts in welding machine front and back panels, such as electric current regulator potentiometer 16, fan 9, display lamp 17 and 18, on and off switch 5 etc., carries out mutual circuit by some pilots and connects。Between each circuit board, device or between parts, link together according to the circuit theory diagrams relation (see accompanying drawing 2) of this utility model welding machine。The circuit output characteristics that can meet argon arc welding and two kinds of welding method functions of manual welding controls。
As shown in Figure 2, panel 3 is provided with the interface MK1 of little panel。Two blocks of control circuit plates link together according to corresponding interface identifier and circuit theory diagrams。Little panel is directly welded on large circuit board by plug-in unit。So, it is no need between circuit board adopting connecting line to be attached。
Accompanying drawing 2 is the circuit theory diagrams of this utility model welding machine。Whole control circuit is mainly made up of ten functional circuits such as input filter circuit, inverter main circuit, output filter circuit, switching power circuit, the drive circuit of IGBT, current detecting and rectification transformating circuit, Thermal protection detection and control circuit, given value of current circuit, solenoid valve control circuit, striking current control circuit, output characteristics control circuits。From the function of its circuit, be mainly input filter, output filtering, anti-interference, the generation of power supply, pwm pulse width adjusting, IGBT pipe drive control, the work such as protective gas break-make controls, the negative feedback control of the inverter circuit output parameter (electric current) of argon arc welding and manual metal-arc welding welding method。Final under the effect of control circuit, it is achieved argon arc welding and manual arc weld, meet the requirements such as the detection of EMC performance and certification。Relevant functional circuit carries out below illustrate:
Seeing accompanying drawing 2, input filter circuit is made up of filter inductance 2MT1 and 2MT2, filter capacitor 2C1 ~ 2C5, resistance 2R1。
Seeing accompanying drawing 2, inverter main circuit is formed bridge inverter main circuit by and off switch S1, input filter circuit, BD1 rectifier bridge, PTC1 critesistor, JR1 relay, the big electrochemical capacitor of C12, C13, C60, C61, G1 ~ G4IGBT pipe, T1 inversion main transformer, D8 ~ D11 and D23 ~ D24 fast recovery diode, output filter circuit etc.。By OUT(+) positive polarity and OUT(-) negative polarity outfan output welding current and voltage。
See accompanying drawing 2, output filter circuit by exporting current filtering inductance L, filter capacitor C45 and C46 forms。
See accompanying drawing 2, switch power supply route T4 switching mode power supply transformer, M1MOS pipe, IC2(3843) pwm pulse width modulator, D15 ~ 16, D12 and D14 fast diode, IC4(7915) and IC5(7815) integrated regulator, and the device composition such as resistance around them, electric capacity, stabilivolt ZD3 and ZD4。
See that the drive circuit of accompanying drawing 2, IGBT is by T3 driving transformer, Q6 ~ Q9MOS field effect transistor, D4 ~ D7 fast diode, and the resistance of they peripheries, electric capacity etc. form。
See that accompanying drawing 2, current detecting and rectification transformating circuit are made up of current detecting ring or T2 current transformer, D19 ~ D22, operational amplifier IC1C, resistance R45 and R50 ~ R52 etc.。
Seeing accompanying drawing 2, Thermal protection detection and control circuit are made up of the devices such as a lot of resistance of critesistor RT2D, operational amplifier IC1A and IC1B and periphery thereof, electric capacity and diode, audion Q5, optocoupler IC8, LEDY, CN2 and the overheated indication LED lamp (yellow) of welding machine panel etc. that is attached thereto thereof。LEDY(yellow) for welding overtemperature protection indication LED lamp on circuit boards。When critesistor RT2D is installed, its temperature detection face is allowed to be close to the radiator of IGBT。
Seeing accompanying drawing 2, output electric current regulator potentiometer that given value of current circuit is connected by operational amplifier IC1D and CN1, current correction potentiometer RP1 and RP2, resistance R46 ~ R49, electric capacity C66 ~ C67 etc. form。
Seeing accompanying drawing 2, output characteristics control circuit is by U2PWM pulse width modulation chip (3846), tetra-operational amplifiers of U1, and the device such as a lot of resistance of these device periphery, electric capacity and diode composition。
Seeing accompanying drawing 2, striking current control circuit is by filter inductance L1,1U1 optocoupler, 1D1 diode, 1Q1 audion, and the composition such as the relevant resistance of above-mentioned device periphery, electric capacity。The effect of filter inductance L1 is to prevent the interference signal impact on rear class control circuit。Outfan OUT(+ when welding machine) and OUT(-) between output voltage higher (such as, welding machine is unloaded) time, having larger current by the LED circuit in L1,1D1,1R1,1U1 optocoupler (TL817), the light emitting diode in 1U1 optocoupler can be better luminous。Now, outfan and 1R3 resistance in 1U1 optocoupler are equivalent to short circuit, make 1Q1 audion be not turned on。Otherwise, only as the outfan OUT(+ of welding machine) and OUT(-) between output voltage relatively low (such as, manual metal-arc welding welding rod contact work status；During argon arc welding, tungsten pin in welding gun or tungsten electrode and workpiece short-circuit condition) time, the light emitting diode in 1U1 optocoupler is luminous hardly。Now, outfan and the two ends of 1R3 resistance in 1U1 optocoupler will not be short-circuit, make 1Q1 triode ON, and the midpoint potential of the electric current regulator potentiometer being connected with CN1 socket can be affected, so that the output of welding machine changes。(such as, recur to after the tungsten pin in welding gun or tungsten electrode and workpiece shorted contacts during argon arc welding once output end voltage raises；Or recur to after manual metal-arc welding welding rod contact workpiece), 1Q1 audion can be not turned on again。As can be seen here, the control of striking electric current is to be undertaken being automatically performed by the height of welding terminal voltage。
Seeing accompanying drawing 2, solenoid valve control circuit is by filter inductance L1,1U2 optocoupler, 1D3 diode, 1D4 stabilivolt, 1Q2 bidirectional thyristor or controllable silicon, and the composition such as the relevant resistance of above-mentioned device periphery, electric capacity。The effect of filter inductance L1 is to prevent the interference signal impact on rear class control circuit。Electromagnetic gas valve adopts the power voltage supplies such as 220V, is connected to CN4 socket。When 1Q2 bidirectional thyristor or controlled silicon conducting, electromagnetic gas valve connects power supply between D, F, makes electromagnetic gas valve action, has argon shield gas to flow out when can make argon arc welding in welding gun。Certainly, the flow-control of gas is to come manual adjustments and control by the argon flow amount meter being arranged on argon bottle。Outfan OUT(+ when welding machine) and OUT(-) between have relatively that high output voltage is (such as, welding machine is unloaded welds state with manual arc) time, 1D4 stabilivolt can puncture, having electric current by the light emitting diode in L1,1R6,1D4,1R7,1U2 optocoupler, 1R9 loop, the light emitting diode in 1U2 optocoupler can luminescence。Now, outfan in 1U2 optocoupler and 1C3 capacitance short-circuit, make 1Q2 bidirectional thyristor or controllable silicon be not turned on, the electromagnetic gas valve being connected with CN4 socket is failure to actuate。Otherwise, only as the outfan OUT(+ of welding machine) and OUT(-) between have relatively low output voltage (such as, manual metal-arc welding welding rod and workpiece short-circuit condition；During argon arc welding, tungsten pin in welding gun or tungsten electrode and workpiece short circuit, or normal argon arc welding state) time, 1D4 stabilivolt will not puncture, and the light emitting diode in 1U2 optocoupler will not be luminous。Now, outfan and the two ends of 1C3 electric capacity in 1U2 optocoupler will not be short-circuit, just can make 1Q2 bidirectional thyristor or controlled silicon conducting, the electromagnetic gas valve action being connected with CN4 socket。As can be seen here, the action of electromagnetic gas valve is that the height by welding terminal voltage carries out automatically controlling。During manual welding, usual user will not connect protection gas circuit, and therefore, the action of electromagnetic gas valve is welded without influence on manual arc。And during argon arc welding, before welding, user can connect protection gas circuit, opening bottle valve, regulate the flow of protective gas in advance, therefore, the action of electromagnetic gas valve can make argon shield gas flow out from welding gun, it is achieved the protection of butt welded seam。
The operation principle of this utility model welding machine other parts functional circuit is summarized as follows: as shown in Figure 2。L and N end is connected to the power supplies such as 220V/50Hz。After on and off switch S1 connects electric network source, welding machine is energized。White power supply indicator (18) on front panel is lighted。From the alternating current that electrical network comes, first pass through two-stage input filter circuit, become Rectified alternating current then through after BD1 rectifier bridge rectification。Output after rectification, first passes through PTC1 critesistor, afterwards, the big electrochemical capacitor of C12, C13, C60, C61 (470 μ F/400V) is charged, and voltage gradually rises, and eventually becomes relatively stable+310V unidirectional current, by output between A, B to late-class circuit。
JR1 relay can be connected on and off switch S1, action after the certain time-delay time, its contact closure or short circuit PTC1 critesistor。The time delay of JR1 relay is controlled by circuit and realizes。The charging of the big electrochemical capacitor of C12, C13, C60, C61, first passes through PTC1 critesistor, afterwards short circuit PTC1 critesistor again。Such control circuit is called the buffer circuit that powers on。
C12, C13, C60, C61 are big, and electrochemical capacitor plays a part filtering。The supply on the one hand of+310V unidirectional current is exported, by G1 ~ G4IGBT pipe, T1 inversion main transformer and D8 ~ D11, D23 ~ D24 fast recovery diode, L, the bridge inverter main circuit that filter reactance etc. forms。Its function is mainly: high voltage direct current is converted to intermediate frequency (tens KHz) alternating current。T1 contravariant transformer realizes the conversion of voltage step-down and High-current output。D8 ~ D11, D23 ~ D24 fast recovery diode are then that the medium frequency alternating current of contravariant transformer output is transformed to unidirectional current。Owing to the current waveform after its conversion is pulsation, unstable, it is unfavorable for stablizing of welding process, therefore, adopts current filter reactor L to be filtered。So, the current waveform of output will become stable。Be conducive to obtaining high-quality weld seam。
On the other hand, + 310V unidirectional current supply by T4 switching mode power supply transformer, M1MOS pipe, IC2(3843) pwm pulse width modulator, D15 ~ 16, D12, D14 fast diode, IC4(7915), IC5(7815) integrated regulator, and the switching power circuit of the device composition such as resistance around them, electric capacity, stabilivolt ZD3 and ZD4, produce+5V ,+15V ,+24V ,-15V supply voltage, supply the live line work such as corresponding control circuit。For switching power circuit part, due to the armature winding of M1MOS pipe with T4 switching mode power supply transformer, and the circuit of the composition such as ZD4 stabilivolt around them, D15 ~ D16 diode, a lot of resistance and electric capacity, it is belonging to+310V high tension loop。For guaranteeing the safety of control circuit, in fig 2, have employed IC3(817) photoelectrical coupler isolates。It is IC2 that Switching Power Supply PWM controls the kernel control chip of platelet, i.e. 3843PWM pulse width regulator。The resistance of its periphery, electric capacity can set the relevant parameter of its work。As to how determine, it is necessary to check UC3843(or TL3843) data used in connection with or explanation。It is not repeated herein。In a word, the driving pulse that pulse is certain operating frequency of IC2 output, the M1MOS pipe in accompanying drawing 2 can be made to be in break-make duty。In 4 voltage follower circuit parts of T4, obtain+5V ,+15V ,+24V ,-15V supply voltage respectively。Supply different devices and circuit uses。Such as ,+24V is by CN3 plug supply fan work；+ 15V and-15V power supply voltage supplying opamp control circuit etc.。About the operation principle of this part of Switching Power Supply, above section has only been by simple illustration。If needing to understand the working condition that this circuit part is detailed, relate to a lot of knowledge of Switching Power Supply。Reader can inquire about relevant on-off circuit books or data is made further to understand。Here no longer describe in detail。
By the circuit of Switching Power Supply part and principle it can be seen that this utility model does not adopt general control transformator and relevant voltage conversion circuit to produce above-mentioned 4 supply voltages。Its circuit power taking is from+the 310V in major loop。The volume of switch transformer and size, being significantly less weight than general control transformator, this just reduces the cost of this utility model welding machine, improves the technical value added of welding machine。
Already described above, in accompanying drawing 2, JR1 pull up time lags behind on and off switch S1 and closes the moment。Namely JR1 relay is deferred action。After the charging voltage on the big electrochemical capacitor of C12, C13, C60, C61 is stable, the just action of this relay, its contact closure PTC1 critesistor, when making the normal inversion of this utility model welding machine work, the contact that big electric current is from relay flows through。Such circuit, is called the buffer circuit that powers on。Mainly prevent on and off switch S1 from connecting moment, owing to the big electrochemical capacitor of C12, C13, C60, C61 not having voltage, be equivalent to short circuit, bigger surge current can be formed, burn out on and off switch S1。And the effect of the buffer circuit that powers on, it is simply that by closing a floodgate, moment seals in PTC1 critesistor, carrys out limit inrush currents。Further, the resistance of PTC1 critesistor, rise with its temperature and increase。Therefore, the buffer circuit that powers on can play good protective effect。
In accompanying drawing 2, T3 driving transformer, Q6 ~ Q9MOS field effect transistor, D4 ~ D7 fast diode, and the driving circuit section of the composition IGBT such as the resistance of they peripheries, electric capacity。4 IGBT, 4 roads drive, and the drive circuit form of each part is consistent。This partial circuit, the control signal A5 of input, A7 are from AOUT and the BOUT outfan of U2PWM pulse width modulation chip (UC3846) in output characteristics control circuit。Owing to the signal of U2 chip output drives power little, therefore needing to be amplified through power circuit of overdriving, the drive circuit again through T3 driving transformer and periphery thereof goes to control the duty of 4 IGBT。The control signal that U2 pulse width modulation (PWM) chip (UC3846) exports is two prescription wave pulse signals。Two prescription wave pulse signals have a regular time poor in time, also referred to as Dead Time in specialty。It is ensure one of IGBT two groups important parameter switching alternation。This time is peripheral components (R21 and the R22 of RT end by UC3846 chip；The C7 of CT end) parameter arrange and determine。As to how determine, it is necessary to check data used in connection with or the explanation of UC3846。It is not repeated herein。Need exist for illustrating: pwm pulse bandwidth modulation signals is the signal determining welding machine inverter main circuit output voltage and size of current。Pwm pulse bandwidth modulation signals is then regulated Setting signal Ug and current negative feedback signal Ufi by the electric current of welding machine and determines。
See accompanying drawing 2, by current detecting ring or T2 current transformer, finally exported current negative feedback signal Ufi by current detecting and rectification transformating circuit。It is connected to the A24 in output characteristics control circuit。
Seeing accompanying drawing 2, output electric current regulator potentiometer is connected to given value of current circuit by CN1。By given value of current circuit, by the outfan of operational amplifier IC1D, namely A21 end obtains electric current and regulates Setting signal Ug。Current correction potentiometer RP1 and RP2, the minimum and maximum electric current of recoverable welding machine output。By with the coordinating of given potentiometer, the output electric current of welding machine can be made to meet the requirement of curent change scope in nameplate。
The control process of this utility model welding machine argon arc welding and manual electric arc welding output characteristics is summarized as follows:
The switch of welding machine rear board closes after connecting power supply extremely short time (during this, welder circuit carries out powering on dash-control, has certain delays time to control), the above-mentioned each panel live line work within welding machine。White power supply indication LED lamp on front panel is bright, and instruction welding machine is charged。U2PWM pulse width control circuit within welding machine produces the pulse signal that a duty is relatively larger, makes the drive circuit works of IGBT, makes two groups of IGBT be in alternating conductive state, finally make inverter main circuit output no-load voltage。When operator regulates the given potentiometer signal Ug of welding current on front panel, and when welding, by current detecting ring or T2 current transformer, current detecting and rectification transformating circuit can detect that the transformer primary current signal in inverter main circuit, i.e. current negative feedback signal Ufi。This current negative feedback signal Ufi, compares with welding current Setting signal Ug。Difference signal after relatively, by the output characteristics control circuit in accompanying drawing 2, carries out PI(ratio and integration) regulable control。The pulse width of the output control U2PWM chip of its output or dutycycle output。By the drive circuit of IGBT, control the make-and-break time of IGBT in inverter main circuit, the final size determining welding machine output electric current and voltage, 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。Say further, when welding current Setting signal Ug is constant, the negative feedback Ufi current signal detected along with welder circuit increases, and, after reaching the setting value given, the difference of the given Ug signal of welding current and Ufi current feedback control signal can increase with electric current and reduce, after PI control, the pulse width or the dutycycle that make welding machine output PWM chip reduce, and the output voltage of welding machine reduces。This process, namely so-called Current cut-off negative feedback controls。Namely only when the feedback control that electric current just works after reaching the setting value of welding current potentiometer。Hereafter, along with the increase that electric current is small, voltage reduces can be a lot。When welding machine output voltage drops to below 16V, along with the reduction of voltage, control circuit can make the pulse width of U2PWM chip or dutycycle increase, and makes welding current increase according to the parameter set, ultimately forms the dropping characteristic dragged outside constant current band。When welding current Setting signal changes, Current cut-off negative feedback setting value is different, but other control process is similar。So, potentiometer set minimum and maximum between, so that it may obtain without several negative characteristic curves。Such control, is also the basic demand meeting argon arc welding and manual arc welding。About U2PWM(3846) operation principle of this partial circuit, above section has only been by simple illustration。If needing to understand the working condition that this circuit part is detailed, relate to a lot of knowledge of 3846 chips。Reader can inquire about relevant books or data is made further to understand。Here no longer describe in detail。
About overtemperature protection control, carry out some explanations below。In welding machine output procedure; when the radiator generation superheating phenomenon of IGBT; or when the radiator that (being close to the radiator installation of IGBT) the critesistor RT2D in Thermal protection detection and control circuit detects IGBT is overheated; by the operational amplifier state turnover in Thermal protection detection and control circuit; making audion Q5 turn on, welding overtemperature protection indication LED Y lamp on circuit boards is lighted；The overheated indication LED lamp (yellow) of welding machine panel being connected with CN2 is lighted。Meanwhile, the lumination of light emitting diode in IC8, its internal triode ON。The output signal of optocoupler IC8, is connected to output characteristics control circuit。By this circuit, the pulse output of U2PWM chip can be closed, make welding machine stop output electric current。Under the effect of cooling blower, when superheating phenomenon eliminates, control circuit just can continue to put out pwm control signal。Overheating indicator lamp (yellow) extinguishes simultaneously。Which achieves welding machine overtemperature protection。
About the EMC electromagnetic Compatibility Design measure of this utility model welding machine, mainly have the following aspects: 1) input two stage filter measure。Seeing accompanying drawing 2, input filter circuit is made up of filter inductance 2MT1 and 2MT2, filter capacitor 2C1 ~ 2C5, resistance 2R1。Have employed the mode of two stage filter。On the one hand, mainly the interference signal from electrical network is filtered, reduces or reduce the adverse effect that welding machine control circuit of the present invention is worked by interference signal, it is ensured that welding machine reliably working。On the other hand, the interference signal that welder circuit produces, during by this filter circuit, also can be controlled, can be reduced or reduce the interference signal adverse effect to power supply grid from welding machine。It is to be noted that there is not above-mentioned filter circuit just can solve EMC problem。Further relate to design and the select permeability such as components and parts and the parameter of parts, material, position in filter circuit。Such as, the selection of the core material of filter inductance and umber of turn；The selection of capacitance parameter；The position etc. of filter arrangement, all can produce impact to the detection of EMC performance。2) output filtering measures。See accompanying drawing 2, output filter circuit by exporting current filtering inductance L, filter capacitor C45 and C46 forms。Current fluctuation can be suppressed, reduce the burr jump signal in current waveform。3) IGBT switch and output rectification interference protection measure。Seeing accompanying drawing 2, in inverter main circuit work process, IGBT switching device, in break-make control process, can produce spike interference signal。These interference signals be in parallel at the resistance at IGBT device two ends and electric capacity (such as R22, C21；R25, C24；C15 ~ C16 etc.) anti-jamming circuit reduced or controlled。And it is connected in parallel on the resistance at fast recovery diode device D8 ~ D11, D23 ~ D24 two ends and electric capacity (such as R27, C26；R26, C25；C44 etc.) anti-jamming circuit then can reduce in fast recovery diode switching process spike interference signal。
Additionally, in structural design, also have the measure of electromagnetic shielding。Panel of the present utility model (3) stands and is arranged on base plate。The part such as inversion and control circuit is equivalent to be surrounded by the metal shell of shell (2), base plate (11) and rear board (10), front panel composition。The isolation effect such as strong electromagnetic, limit electromagnetic radiation can be played。
Above-mentioned measure is to ensure that the welding machine product made based on circuit of the present invention can pass through the important prerequisite of the detection of EMC internal authority mechanism performance and certification。
What be above each circuit part of this utility model welding machine and argon arc welding and manual metal-arc welding method briefly controls procedure declaration。Owing to this utility model has been presented for the detailed circuit schematic diagram of accompanying drawing 2, therefore, for there being the people of circuit reading ability (or possessing interlock circuit knowledge), can understand completely。Circuit diagram is exactly a kind of noiseless language。But, for not having the people of circuit reading ability (or not possessing interlock circuit knowledge), even if that explains is many again, they are also elusive。In view of the relation of length, main part can only be set forth herein, so that reader better understood when operation principle and the process be correlated with。
Visible by described above, this utility model circuit has mentality of designing and the method for oneself uniqueness。Not only can realize welding machine argon arc welding and two kinds of welding method outputs of manual metal-arc welding etc. to control, and, designed control circuit and the complete machine structure of welding machine, it is all make this utility model welding machine product meet EMC and security credential requirement, there is the basic reason place of the technical advantages such as good control performance, be also meet product efficiently and low-cost production, high reliability, manufacturing process technology advance important leverage。
Additionally, connect simple between circuit board of the present utility model, on circuit board, device is much adopt automatic placement machine and inserter to complete processing, and its manufacturing process and production technology are greatly simplified, reduce product weight, production and cost of transportation。
Above content is in conjunction with concrete machine structure and circuit board and controls the detailed description that this utility model is made by function, it is impossible to assert that of the present utility model being embodied as is only limited to these explanations。Others skilled in the art for technical field described in the utility model, 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 this utility model protection category。
Claims (6)
1. one kind meets the EMC IGBT inversion argon arc welding required and manual arc welder structure, including housing portion, front-facing portion, rear board part and panel part, it is characterized in that: described panel part mainly includes input filter circuit, inverter main circuit, output filter circuit, switching power circuit, the drive circuit of IGBT, current detecting and rectification transformating circuit, Thermal protection detection and control circuit, given value of current circuit, solenoid valve control circuit, striking current control circuit, these ten functional circuits of output characteristics control circuit, between each circuit, circuit connects, panel part is divided into two pieces of big panels and little panel, wherein output characteristics control circuit layout is on little panel, other circuit then layout is on big panel；The large circuit board of panel part stands on the base plate being arranged on housing parts, and panel part is divided into two pieces, and little panel is directly welded on big panel by plug-in unit。
2. as claimed in claim 1 a kind of meet EMC require IGBT inversion argon arc welding and manual arc welder structure, it is characterized in that: on little panel, there is output characteristics control circuit in primary placements, output characteristics control circuit is by U2PWM pulse width modulation chip (UC3846), tetra-operational amplifiers of U1, and the device such as a lot of resistance of these device periphery, electric capacity and diode composition。
3. as claimed in claim 1 a kind of meet EMC require IGBT inversion argon arc welding and manual arc welder structure, it is characterised in that: described big panel be provided with input two stage filter circuit, output filter circuit, IGBT switch and output rectification anti-jamming circuit。
4. as claimed in claim 1 a kind of meet EMC require IGBT inversion argon arc welding and manual arc welder structure, it is characterised in that: housing portion includes shell and base plate。
5. a kind of as claimed in claim 1 meet the EMC IGBT inversion argon arc welding required and manual arc welder structure, it is characterised in that: described rear board part is provided with: on and off switch, connect the argon inlet mouth of electromagnetic valve, power supply line and plug, wire fixer, rear plastic panel, cooling fan；Power line and plug are connected to power supply grid, on and off switch (5) controls the on-off of welding machine electric power, cooling fan is positioned at the rear portion of welding machine, and cold wind carries out from the air inlet at welding machine rear portion, and some heater members of left side circuit part or parts can be made to be cooled down preferably。
6. as claimed in claim 1 a kind of meet EMC require IGBT inversion argon arc welding and manual arc welder structure; it is characterized in that: described front-facing portion is provided with: plastic front panel or front cover, two groups of output snap joint holder assemblies, connect the argon outlet nozzle of argon-arc welding gun, working power display lamp and Thermal protection status indicator lamp, manual welding electric current output regulator potentiometer, when two groups of output snap joint holder assemblies are for manual electric arc welding, connect welding clamp cable and workpiece clamp cable respectively；Working power display lamp instruction power on；Thermal protection status indicator lamp then indicates whether superheat state occurs, and when internal components temperature is too high, when exceeding operating temperature, under the effect of control circuit, this display lamp can be made to light on the one hand；On the other hand, welding machine can be made to stop welding or output。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521101441.7U CN205324948U (en) | 2015-12-28 | 2015-12-28 | Accord with IGBT contravariant argon arc that EMC required weld with manual metal -arc welding machine structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521101441.7U CN205324948U (en) | 2015-12-28 | 2015-12-28 | Accord with IGBT contravariant argon arc that EMC required weld with manual metal -arc welding machine structure |
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| CN205324948U true CN205324948U (en) | 2016-06-22 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106112214A (en) * | 2016-08-23 | 2016-11-16 | 浙江肯得机电股份有限公司 | A kind of structure of two welding functional module IGBT inverter type welders |
| CN109352136A (en) * | 2018-12-05 | 2019-02-19 | 浙江肯得机电股份有限公司 | A kind of IGBT contravariant argon arc welding machine of more welding methods |
| CN109352130A (en) * | 2018-12-05 | 2019-02-19 | 浙江肯得机电股份有限公司 | A kind of single-phase multi-power source voltage contravariant argon arc welding and manual arc welder |
| CN109551085A (en) * | 2018-12-07 | 2019-04-02 | 浙江肯得机电股份有限公司 | A kind of IGBT inversion multifunctional welding machine of liquid crystal display multi input voice prompting |
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2015
- 2015-12-28 CN CN201521101441.7U patent/CN205324948U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106112214A (en) * | 2016-08-23 | 2016-11-16 | 浙江肯得机电股份有限公司 | A kind of structure of two welding functional module IGBT inverter type welders |
| CN106112214B (en) * | 2016-08-23 | 2017-12-22 | 浙江肯得机电股份有限公司 | A kind of structure of two welding functions module I GBT inverter type welders |
| CN109352136A (en) * | 2018-12-05 | 2019-02-19 | 浙江肯得机电股份有限公司 | A kind of IGBT contravariant argon arc welding machine of more welding methods |
| CN109352130A (en) * | 2018-12-05 | 2019-02-19 | 浙江肯得机电股份有限公司 | A kind of single-phase multi-power source voltage contravariant argon arc welding and manual arc welder |
| CN109352136B (en) * | 2018-12-05 | 2024-01-23 | 浙江肯得机电股份有限公司 | IGBT inversion type argon arc welding machine with multiple welding methods |
| CN109551085A (en) * | 2018-12-07 | 2019-04-02 | 浙江肯得机电股份有限公司 | A kind of IGBT inversion multifunctional welding machine of liquid crystal display multi input voice prompting |
| CN109551085B (en) * | 2018-12-07 | 2023-12-08 | 浙江肯得机电股份有限公司 | IGBT inversion multifunctional welding machine with liquid crystal display and multiple input voice prompt functions |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160622 Termination date: 20211228 |