CN205496750U - IGBT single tube inverter type argon arc of height striking frequently weld with dual -purpose machine of manual metal -arc welding - Google Patents
IGBT single tube inverter type argon arc of height striking frequently weld with dual -purpose machine of manual metal -arc welding Download PDFInfo
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- CN205496750U CN205496750U CN201521099400.9U CN201521099400U CN205496750U CN 205496750 U CN205496750 U CN 205496750U CN 201521099400 U CN201521099400 U CN 201521099400U CN 205496750 U CN205496750 U CN 205496750U
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Abstract
The utility model relates to a IGBT single tube inverter type argon arc of height striking frequently weld with dual -purpose machine of manual metal -arc welding, including outer housing part, front panel part, rear panel subtotal internal control board branch, the big control panel of control panel part is standing and is installing on outer housing part's bottom plate, the control panel part divide into two, little control panel through the plug -in components beading on control panel greatly, control panel part main including contravariant main circuit, output filter circuit, switching power supply circuit, IGBT drive circuit, current detection and rectification transfer circuit, heat protection detection and control circuit, the preset circuit of electric current, solenoid valve control circuit, high frequency striking control circuit, striking electric current control circuit, output characteristic control circuit, wherein the output characteristic control circuit overall arrangement on little control panel, other circuit then the overall arrangement on big control panel, the utility model discloses have good control performance, security and reliability, therefore the welding machine there is better market adaptability.
Description
Technical field
This utility model relates to IGBT single-tube contravariant formula argon arc welding and the dual-purpose machine of manual metal-arc welding of a kind of band high-frequency arc strike, belongs 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 the fiercest, is not only embodied in technology
Advance and advantage on, 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 usual
At 80 ~ 200A(cyclic duration factor 100 ~ 15%) level.Different products, its control circuit schematic diagram, board structure of circuit and whole
Machine structure design etc. is different.The aspects such as performance, reliability, processing technology and the cost at product, also have bigger difference
The opposite sex.Therefore, how on the premise of low cost, the welding machine that exploitation performance is good has certain technical difficulty.This is also this reality
The problem solved with novel needs.
Utility model content
The purpose of this utility model is to provide the IGBT single-tube contravariant formula argon arc welding of a kind of band high-frequency arc strike and manual metal-arc welding
Dual-purpose machine, has argon arc welding and the function of two kinds of welding methods of manual metal-arc welding, and meets Product Safety detection and authentication requesting,
Welder circuit plate is designed as two pieces；Little panel is welded on big panel, and whole control circuit is mainly by inverter main circuit, defeated
Go out filter circuit, switching power circuit, IGBT drive circuit, current detecting and rectification transformating circuit, Thermal protection detection and control
Circuit, given value of current circuit, solenoid valve control circuit, high-frequency arc strike control circuit, striking current control circuit, output characteristics control
11 functional circuit compositions of circuit processed；If the main circuit output characteristics control circuit on little panel, its core is by 3846
Pwm pulse width modulated chip and peripheral components composition thereof, from the point of view of the function of its circuit, mainly complete input rectifying filter
Ripple, inversion, output filtering, the generation of DC supply anti-interference, each, pwm pulse width adjusting, IGBT pipe drive control,
The work such as the negative feedback control of the inverter circuit output parameter of argon arc welding and manual metal-arc welding welding method, finally at the work of control circuit
Under with, it is achieved argon arc welding and two kinds of welding methods of manual metal-arc welding, meet the detection of safety performance and the requirement such as certification.
The IGBT single-tube contravariant formula argon arc welding of a kind of band high-frequency arc strike and the dual-purpose machine of manual metal-arc welding, including housing portion, above
Plate part, rear board part and internal control plate part, it is characterised in that: the big panel of described panel part stands pacifies
Being contained on the base plate of housing portion, panel part is divided into two pieces, and little panel is to be directly welded at big panel by plug-in unit
On；Described panel part mainly includes that inverter main circuit, output filter circuit, switching power circuit, IGBT drive electricity
Road, current detecting and rectification transformating circuit, Thermal protection detection and control circuit, given value of current circuit, solenoid valve control circuit, height
Frequency striking arc control circuit, striking current control circuit, output characteristics control circuit, wherein output characteristics control circuit layout is little
On panel, other circuit then layout is on big panel.
Described high-frequency arc strike control circuit part, by HEF40106 chip, 817 optocouplers, high voltage package, striking transformator,
SD, high-voltage capacitance, metal-oxide-semiconductor, and a lot of resistance of these device periphery, electric capacity and diode component composition.
Big control circuit plate be provided with inverter main circuit, output filter circuit, switching power circuit, IGBT drive circuit,
Current detecting and rectification transformating circuit, Thermal protection detection and control circuit, given value of current circuit, solenoid valve control circuit, high frequency
Arc ignition control circuit, striking current control circuit, between each circuit, circuit connects.
Described housing portion includes shell and base plate.
Be provided with in described rear board part: on and off switch, connect the argon inlet mouth of electromagnetic valve, power supply line and
Plug, rear plastic panel, cooling fan；Power line and plug are connected to power supply grid, and on and off switch controls welding machine electric power
On-off, cooling fan is positioned at the rear portion of welding machine, and the cold wind air inlet from welding machine rear portion is carried out, and can make the one of left side circuit part
A little heater members or parts are preferably cooled down.
It is provided with on described front-facing portion: plastic front panel or front cover, output snap joint holder assembly, connection argon
The argon outlet nozzle of arc welding torch, working power display lamp, Thermal protection status indicator lamp, argon arc welding (TIG)/manual metal-arc welding (MMA) merit
Energy permutator, manual welding electric current output regulator potentiometer, two groups of output snap joint holder assemblies are for the manual electric arc welding time-division
Lian Jie welding clamp cable and workpiece clamp cable.
This utility model welding machine, owing to having good control performance, safety and reliability, thus welding machine has preferably
Market adaptability.Its good circuit and structure design thereof are also advantage places of the present utility model, are also to meet efficiently and low
Cost production, high reliability, the important leverage of manufacturing technology advance.The circuit theory of this utility model welding machine, circuit board and
Complete machine structure is designed with the unique distinction of oneself.
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 circuit theory diagrams (two) of this utility model welding machine；
Accompanying drawing 4 is the circuit theory diagrams (three) of this utility model welding machine.
Detailed description of the invention
As Figure 1-4, the IGBT single-tube contravariant formula argon arc welding of a kind of band high-frequency arc strike and the dual-purpose machine of manual metal-arc welding, it is main
Ingredient includes:
1) housing portion.Including shell 2, braces 1, base plate 11, shell screw etc..
2) rear board part, the parts that rear board 10 is installed mainly have: on and off switch 5, the argon of connection electromagnetic valve
The part such as suction nozzle 4, power supply line and plug 7, wire fixer 6, rear plastic panel 8, cooling fan 9.Power line and plug 7
It is 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 is from weldering
The air inlet at machine rear portion is carried out.Some heater members or the parts of left side circuit part can be made, such as IGBT and radiator heat-dissipation
The parts such as device, fast recovery diode and radiator are preferably cooled down.Such air channel and type of cooling design, favorably
In ensureing the reliability of welder circuit work, also it is that this utility model welding machine realizes the important of larger current and high capacity water holdup
One of reason.
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, the connection argon outlet nozzle 15 of argon-arc welding gun, working power instruction
Lamp 18 and Thermal protection status indicator lamp 17, argon arc welding (TIG)/manual metal-arc welding (MMA) function switch 19, the output of manual welding electric current
The parts such as regulator potentiometer 16.Two groups of output snap joint holder assemblies 13,14 connect electrode holders when manual electric arc welding respectively
Cable and workpiece clamp cable；Working power display lamp 18 indicates power on.Thermal protection status indicator lamp 17 then indicates overheated shape
Whether state occurs.When internal components temperature is too high, when exceeding operating temperature, under the effect of control circuit, on the one hand can make this
Display lamp is lighted；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 of blower fan is made
Reduce by the temperature that can make device.When being reduced to recovery action temperature, welding machine superheating phenomenon eliminates.Overheating indicator lamp extinguishes.
Meanwhile, welding machine can weld again.Certainly, according to the needs of production, front panel 12 also can arrange ammeter, voltmeter etc.
Parts, with function or the performance of extended products.
4) panel part.Including a lot of parts on panel 3 and this panel.Such as, IGBT(4 is only) and dissipate
Backing, CBB475K/400V electric capacity, the big electrochemical capacitor of 470uF/400V, little control (PCB circuit) plate, driving transformer, electric current
Transformer or electric current loop, rectifier bridge and radiator thereof, 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 radiator, inversion main transformer pressure
The parts such as device.Also a lot of electronic devices and components are had, such as 3846PWM control chip, operational amplifier, resistance, electricity on little panel
Hold.
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, instruction
Lamp 17 and 18, argon arc welding (TIG)/manual metal-arc welding (MMA) function switch 19, on and off switch 5 etc., entered by some pilots
The circuit connection that row is mutual.Between each circuit board, between device or parts, according to the circuit theory of this utility model welding machine
Figure relation (see accompanying drawing 2 and accompanying drawing 3) links together.The circuit that can meet argon arc welding and two kinds of welding method functions of manual welding is defeated
Go out Characteristics Control.
As shown in Figure 2-4, panel 3 is provided with the interface of little panel.Two blocks of control circuit plates are exactly according to phase
The interface identifier answered and circuit theory diagrams link together.Little panel is to be directly welded at large circuit board or control by plug-in unit
In making sheet 3.So, it is no need between circuit board using connecting line to be attached.
Accompanying drawing 2-4 is the circuit theory diagrams of this utility model welding machine.Whole control circuit is mainly by inverter main circuit, output
Filter circuit, switching power circuit, IGBT drive circuit, current detecting and rectification transformating circuit, Thermal protection detection and control electricity
Road, given value of current circuit, solenoid valve control circuit, high-frequency arc strike control circuit, striking current control circuit, output characteristics control
11 functional circuit compositions such as circuit.From the point of view of the function of its circuit, mainly complete input rectifying filtering, inversion, output
Filtering, the generation of DC supply anti-interference, each, pwm pulse width adjusting, IGBT pipe drive control, argon arc welding and hands arc
The work such as the negative feedback control of the inverter circuit output parameter (electric current) of welding method.It is final under the effect of control circuit,
Realize argon arc welding and two kinds of welding methods of manual metal-arc welding, meet the requirements such as the detection of safety performance and certification.Below to relevant merit
Energy circuit carries out some and illustrates:
See accompanying drawing 2, inverter main circuit by and off switch S1, input rectifying bridge BD1, PTC1 critesistor, JR1 relay,
The big electrochemical capacitor of C12, C13, C60 (470 F/400V etc.) filter circuit, G1 ~ G4 IGBT pipe, T1 inversion main transformer, D8 ~
The composition bridge inverter main circuit such as D11 and D23 ~ D24 fast recovery diode, output filter circuit.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 L2, filter capacitor C45 and C46 forms.
See accompanying drawing 3 and accompanying drawing 3, switch power supply route T4 switching mode power supply transformer, M1 metal-oxide-semiconductor, IC2 (3843) PWM
Pulse-width modulator, D15 ~ 16, D12 and D14 fast diode, IC4(7915) and IC5(7815) integrated regulator, and
The device compositions such as resistance around them, electric capacity, stabilivolt ZD3 and ZD4.
Seeing accompanying drawing 2 to accompanying drawing 4, the drive circuit of IGBT is fast by T3 driving transformer, Q6 ~ Q9 metal-oxide-semiconductor field effect transistor, D4 ~ D7
Speed diode, and the composition such as the resistance of they peripheries, electric capacity.
See accompanying drawing 2 to accompanying drawing 4, current detecting and rectification transformating circuit by current detecting ring or T2 current transformer, D19 ~
D22, operational amplifier IC1C, resistance R45 and R50 ~ R52 etc. form.
See accompanying drawing 3 and accompanying drawing 4, Thermal protection detection and control circuit by critesistor RT2D, operational amplifier IC1A and
Device, audion Q5, optocoupler IC8, LEDY, the CN2 such as a lot of resistance, electric capacity and the diode of IC1B and periphery thereof and connect therewith
The welding machine panels overheated indication LED lamp (yellow) connect etc. form.LEDY(yellow) refer to for the overtemperature protection welded on circuit boards
Show LED.When critesistor RT2D is installed, its temperature detection face is allowed to be close to the radiator of IGBT.
See accompanying drawing 3 and accompanying drawing 4, the output electric current regulation electricity that given value of current circuit is connected by operational amplifier IC1D with CN1
The compositions such as position device, current correction potentiometer RP1 and RP2, resistance R46 ~ R49, electric capacity C66 ~ C67.CN5 then can connect the electricity of welding machine
Stream display table.
Seeing accompanying drawing 3 and accompanying drawing 4, output characteristics control circuit is by U2 pwm pulse width modulated chip (3846), U1 tetra-
Operational amplifier, and the device such as a lot of resistance, electric capacity and the diode of these device periphery composition.
Seeing accompanying drawing 2 to accompanying drawing 4, striking current control circuit is by filter inductance L1,1U1 optocoupler, 1D1 diode, 1Q1 tri-pole
Pipe, and the composition such as the relevant resistance of above-mentioned device periphery, electric capacity.The effect of filter inductance L1 is to prevent from disturbing signal to rear class
The impact of control circuit.Outfan OUT(+ when welding machine) and OUT(-) between output voltage higher (such as, welding machine unloaded) time,
Have larger current by the LED circuit in L1,1D1,1R1,1U1 optocoupler (TL817), the luminescence two in 1U1 optocoupler
Pole pipe can be the most luminous.Now, outfan and 1R3 resistance in 1U1 optocoupler are equivalent to short circuit, make 1Q1 audion be not turned on.Instead
It, only as the outfan OUT(+ of welding machine) and OUT(-) between output voltage relatively low (such as, manual metal-arc welding welding rod contact workpiece shape
State；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 hardly
Luminous.Now, outfan and the two ends of 1R3 resistance in 1U1 optocoupler will not be short-circuit, make 1Q1 triode ON, with CN1 socket
The midpoint potential of the electric current regulator potentiometer connected can be affected, so that the output of welding machine changes.Once outfan
(such as, during argon arc welding, the tungsten pin in welding gun or tungsten electrode recur to after workpiece shorted contacts in voltage rising；Or manual metal-arc welding welding rod
Recur to after contact workpiece), 1Q1 audion can be not turned on again.As can be seen here, striking electric current controls is to pass through welding terminal
The height of voltage carries out being automatically performed.
See that accompanying drawing 2 to accompanying drawing 4, switch S1 are the power supply switches on welding machine rear board；S2 is on welding machine front panel
Argon arc welding (TIG)/manual metal-arc welding (MMA) welding function or method choice switch.Switch is TIG argon arc welding state when closing.Disconnect
Time be MMA manual metal-arc welding state.S2-1 and S2-2 is a part of switch S2；S3 is TIG argon arc welding gun switch.
See accompanying drawing 3 and accompanying drawing 4, the electromagnetic valve DF control circuit of 220V by relay J R2, audion 2Q3, electric capacity 2C1,
2C2 and 2C3, diode 2D1, TIG arc welding gun switch S3 etc. form.When selecting manual electric arc welding, do not use TIG welding gun, and S2-
1 is off, and therefore, 2Q3 does not turns on, and relay J R2 is failure to actuate, electromagnetic gas valve DF also will not action.When selecting TIG weldering
Time, using TIG welding gun, and S2-1 is Guan Bi, 2Q1 audion is conducting.The A3 signal of IC8 optocoupler output is low electricity
Flat, welding machine is without output.When arc welding gun switch S3 closes, 2Q1 audion becomes cut-off state, and the A3 signal of IC8 optocoupler output is
High level, welding machine has output；2Q3 can turn on, the action of relay J R2, and electromagnetic gas valve DF also can action.Make by the argon of Air Valve Control
Protective gas in gas cylinder flows out from welding gun, and the weld metal of protection welding region will not oxidation by air.Work as arc welding gun switch
When S3 disconnects, on the one hand, 2Q2 audion can end immediately, and 2Q1 can turn on immediately, the A3 signal of IC8 optocoupler output is low electricity
Flat, welding machine is without output.On the other hand, because with the presence of 2R2 resistance and the integrating circuit of 2C2 electric capacity, 2Q3 may proceed to conducting, continues
Electrical equipment JR2 and electromagnetic gas valve DF also can keep action.Realize the delayed of protective gas to hold one's breath.
Seeing accompanying drawing 3 and accompanying drawing 4, high-frequency arc strike control circuit is put by 3T1 high voltage package, 3T2 striking (boosting) transformator, spark
Electrical equipment FD, electric capacity 3C43 and 3C11,3Q4 metal-oxide-semiconductor, 3U1(HEF40106) chip, and a lot of devices composition of periphery.OUT
(+) and OUT(-) be the positive and negative outfan of welding machine.OUT A and OUT B is connected on the output negative pole loop of inverter main circuit
In.When selecting TIG weldering, S2-1 and S2-2 is Guan Bi.Now, 2Q1 audion is conducting.The A3 letter of IC8 optocoupler output
Number being low level, welding machine is without output.Due to OUT(+) and OUT(-) do not have voltage to export between positive and negative outfan, therefore, high frequency
Arc ignition control circuit does not works.When arc welding gun switch S3 closes, 2Q1 audion becomes cut-off state, the A3 of IC8 optocoupler output
Signal is high level, and welding machine exports relatively high non-load voltage.Now, due to OUT(+) and OUT(-) have relatively between positive and negative outfan
High voltage output, therefore, high-frequency arc strike control circuit also can work.3U1(HEF40106) the output of chip, can make 3Q4
Metal-oxide-semiconductor forms batch (-type) break-make.By the boosting of 3T1 high voltage package, the voltage at electric capacity 3C43 and 3C11 two ends can be made to raise.
When voltage is increased to puncture the air gap reached between SD FD, and when forming electric discharge, electric capacity 3C43 and 3C11 draws with 3T2
The armature winding of arc (boosting) transformator constitutes oscillating circuit, and its Resonant High Voltage high-frequency signal produced (rises through 3T2 striking
Pressure) coupling of transformator and boosting again, it is incorporated into secondary loop or the welding circuit of inverter main circuit.If now welded
The distance between tungsten pin and workpiece in rifle is suitable, and has Ar(argon) protective gas flows out from welding gun, then can realize
The high-frequency arc strike of argon arc welding, i.e. air gap between tungsten pin and workpiece are punctured by high-frequency and high-voltage oscillator signal, and finally ignite electric arc, it
After can be carried out normal argon arc welding operation.After striking success, the output voltage of welding machine reduces rapidly that (this is also in that argon arc
Voltage be reason minimum in all welding arcs), generally only about tens volts.(more general than the arc voltage of manual welding
About 25V) to be at half.Now, high-frequency arc strike control circuit can make 3U1(HEF40106) chip stops output, even if 3Q4
Metal-oxide-semiconductor stops batch (-type) break-make.So, 3T1 high voltage package and 3T2 striking (boosting) transformator and SD FD also can be stopped
Only produce high pressure and high-frequency and high-voltage vibration.Unless after welding arc current interruption, above-mentioned control process just can be repeated.In argon arc welding process
In, as OUT(+) and when OUT(-) having higher weldingvoltage output between positive and negative outfan, 3ZD5 stabilivolt can be made to puncture,
Voltage stabilizing, IC9 optocoupler output A3 signal be low level, make welding machine without output, until welding machine output voltage reduce after, can be again
Output.Therefore, IC9 optocoupler is also the key controlling welding machine output voltage height.
The operation principle of this utility model welding machine other parts functional circuit is summarized as follows: as shown in Figure 2.L Yu N end is even
Receive the power supplies such as 220V/50Hz.After on and off switch S1 connects electric network source, welding machine is energized.White power supply on front panel
Display lamp (18) is lighted.The alternating current come from electrical network, becomes Rectified alternating current after BD1 rectifier bridge rectification.Defeated after rectification
Going out, first pass through PTC1 critesistor, afterwards, electrochemical capacitor big to C12, C13, C60 (470 F/400V etc.) is charged, voltage
Gradually rise, eventually become 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 heat
Quick resistance.The time delay of JR1 relay is controlled by circuit and realizes.C12, C13, C60 big electrochemical capacitor (470 F/400V
Deng) charging, first pass through PTC1 critesistor, the most again short circuit PTC1 critesistor.Such control circuit is referred to as powering on slow
Rush circuit.
The big electrochemical capacitor of C12, C13, C60 (470 F/400V etc.) plays a part filtering.On the one hand+310V unidirectional current supplies
Give and exported filter reactance by G1 ~ G4 IGBT pipe, T1 inversion main transformer and D8 ~ D11, D23 ~ D24 fast recovery diode, L2
Bridge inverter main circuit Deng composition.Its function is mainly: high voltage direct current is converted to intermediate frequency (tens KHz) alternating current.T1 is inverse
Become transformator and realize the conversion of voltage step-down and High-current output.D8 ~ D11, D23 ~ D24 fast recovery diode are then inversion
The medium frequency alternating current of transformator output is transformed to unidirectional current.Current waveform after converting due to it is pulsation, unstable, unfavorable
Stablizing in welding process, therefore, uses current filter reactor L2 to be filtered.So, the current waveform of output will become
Must stablize.Be conducive to obtaining high-quality weld seam.
On the other hand ,+310V unidirectional current supplies by T4 switching mode power supply transformer, M1 metal-oxide-semiconductor, IC2 (3843) pwm pulse
Width modulator, D15 ~ 16, D12, D14 fast diode, IC4(7915), IC5(7815) integrated regulator, and they week
The switching power circuit of the device compositions such as the resistance that encloses, electric capacity, stabilivolt ZD3 and ZD4, produces+5V ,+15V ,+24V ,-15V electricity
Source voltage, supplies the live line work such as corresponding control circuit.For switching power circuit part, owing to M1 metal-oxide-semiconductor switchs with T4
The armature winding of mains transformer, and the group such as ZD4 stabilivolt, D15 ~ D16 diode, a lot of resistance and the electric capacity around them
The circuit become, is belonging to+310V high tension loop.For guaranteeing the safety of control circuit, in fig 2, have employed IC3 (817)
Photoelectrical coupler is isolated.It is IC2 that Switching Power Supply PWM controls the kernel control chip of platelet, i.e. 3843 pwm pulse width
Actuator.The resistance of its periphery, electric capacity can set the relevant parameter of its work.As to how determine, need to check UC3843(or
TL3843) data used in connection with or explanation.It is not repeated herein.In a word, the pulse of IC2 output is driving of certain operating frequency
Moving pulse, can make the M1 metal-oxide-semiconductor in accompanying drawing 2 be in break-make duty.In 4 voltage follower circuit parts of T4, obtain respectively
Obtain+5V ,+15V ,+24V ,-15V supply voltage.Supply different devices and circuit uses.Such as ,+24V is supplied by CN3 plug
To fan work；+ 15V and-15V power supply voltage supplying opamp control circuit etc..Work about this part of Switching Power Supply
Making principle, 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 to Switching Power Supply.Reader can inquire about relevant on-off circuit books or data is made further to understand.The most not
Describe in detail again.
From circuit and the principle of Switching Power Supply part, this utility model does not use general control transformator and phase
The voltage conversion circuit closed produces above-mentioned 4 supply voltages.Its circuit power taking is from+the 310V in major loop.Switch transformation
The volume of device 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.
I.e. JR1 relay is deferred action.When the charging voltage on the big electrochemical capacitor of C12, C13, C60 (470 F/400V etc.) is stable
After, the just action of this relay, its contact closure PTC1 critesistor, when making the normal inversion of this utility model welding machine work, electricity greatly
Stream is that the contact from relay flows through.Such circuit, is referred to as the buffer circuit that powers on.Mainly prevent on and off switch S1 from connecting
Moment, owing to there is no voltage on the big electrochemical capacitor of C12, C13, C60, 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, limits surge electricity
Stream.Further, the resistance of PTC1 critesistor, rise with its temperature and increase.Therefore, the buffer circuit that powers on can play relatively
Good protective effect.
In accompanying drawing 2 to accompanying drawing 3, T3 driving transformer, Q6 ~ Q9 metal-oxide-semiconductor field effect transistor, D4 ~ D7 fast diode, and it
The driving circuit section of the composition IGBT such as peripheral resistance, electric capacity.4 IGBT, 4 roads drive, the drive circuit of each part
Form is consistent.This partial circuit, control signal A5 of input, A7 are from the U2 pwm pulse in output characteristics control circuit
A OUT and the B OUT outfan of width modulated chip (UC3846).Owing to the signal of U2 chip output drives power little, therefore need
To be amplified through power circuit of overdriving, then to go to control 4 IGBT by the drive circuit of T3 driving transformer and periphery thereof
Duty.The control signal that U2 pulse width modulation (PWM) chip (UC3846) exports is two prescription wave pulse signals.Two
Prescription wave pulse signal has a regular time poor in time, and specialty is also referred to as Dead Time.It is to ensure IGBT two groups
One of important parameter of switch alternation.This time is peripheral components (R21 and R22 of RT end by UC3846 chip；CT
End C7) parameter arrange and determine.As to how determine, need to check the data used in connection with of UC3846 or explanation.Here
It is not repeated.Need exist for explanation: pwm pulse bandwidth modulation signals is to determine welding machine inverter main circuit output voltage and electricity
The signal of stream size.Pwm pulse bandwidth modulation signals is then regulated Setting signal Ug by the electric current of welding machine and Current Negative Three-Point Capacitance is believed
Number Ufi determines.
See accompanying drawing 2 to accompanying drawing 4, by current detecting ring or T2 current transformer, finally by current detecting and rectifying conversion
Circuit output current negative-feedback signal Ufi.It is connected to the A24 in output characteristics control circuit.
See that accompanying drawing 3 and accompanying drawing 4, output electric current regulator potentiometer are connected to given value of current circuit by CN1.Given by electric current
Determining circuit, by the outfan of operational amplifier IC1D, i.e. A21 end obtains electric current regulation 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 of welding machine can be made
Electric current meets the requirement of curent change scope in nameplate.CN5 then can connect the electric current display table of welding machine.
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 and connects after power supply extremely short time that (during this, welder circuit powers on
Dash-control, have certain delays time to control), the above-mentioned each panel live line work within welding machine.White power supply on front panel
Indication LED lamp is bright, and instruction welding machine is charged.
Manual arc postwelding is selected when being switched by the method choice on welding machine front panel, under the effect of control circuit,
U2 pwm pulse Width Control circuit within welding machine produces the pulse signal that a dutycycle is bigger, makes the drive circuit of IGBT
Work, makes two groups of IGBT be in alternating conductive state, finally makes inverter main circuit output no-load voltage.Before operator regulates
The given potentiometer signal Ug of welding current on panel, and when welding, by current detecting ring or T2 current transformer, by
Current detecting and rectification transformating circuit can detect that the transformer primary current signal in inverter main circuit, i.e. Current Negative Three-Point Capacitance letter
Number Ufi.This current negative feedback signal Ufi, compares with welding current Setting signal Ug.Difference signal after Bi compare, passes through
Output characteristics control circuit in accompanying drawing 3, carries out PI(ratio and integration) regulation control.The output control U2 PWM core of its output
The pulse width of sheet or dutycycle output.By the drive circuit of IGBT, control the make-and-break time of IGBT in inverter main circuit,
Determine welding machine output electric current and the size of voltage eventually, it is achieved the accurate control of output current parameters.And make the output characteristics of welding machine
For the dropping characteristic dragged outside constant current band.Say further, when welding current Setting signal Ug is constant, along with welder circuit detects
The negative feedback Ufi current signal that arrives increases, and, after reaching given setting value, welding current gives Ug signal and Ufi electric current
The difference of negative feedback control signal can increase with electric current and reduce, and after PI control, makes the pulse width of welding machine output PWM chip
Degree or dutycycle reduce, and the output voltage of welding machine reduces.This process, the most so-called Current cut-off negative feedback controls.I.e.
The feedback control only just worked after electric current reaches the setting value of welding current potentiometer.Hereafter, small along with electric current
Increasing, 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 U2 PWM chip or dutycycle increase, and make welding current increase according to the parameter set, ultimately form constant current band
The dropping characteristic dragged outward.When welding current Setting signal changes, Current cut-off negative feedback setting value is different, but other control
Process is similar.So, between the minimum and maximum that potentiometer sets, so that it may obtain without several negative characteristic curves.This
The control of sample, is also the basic demand meeting manual arc welding.
After switching selection argon arc welding by the method choice on welding machine front panel, if the weldering needed for connecting argon arc welding
After the necessary device such as rifle, protective gas, welding operation can be started.First, make to keep between welding gun tungsten pin and workpiece suitable away from
From, it is common that several millimeters.After pressing arc welding gun switch S3, under the effect of control circuit, electromagnetic gas valve DF action, first weld
District's conveying protective gas.Meanwhile, the U2 pwm pulse Width Control circuit within welding machine produces the pulse that a dutycycle is bigger
Signal, makes the drive circuit works of IGBT, makes two groups of IGBT be in alternating conductive state, finally makes inverter main circuit output no-load
Voltage.Afterwards, under the effect of high-frequency arc strike control circuit, it is achieved high-frequency arc strike.The output electric current of welding machine, is regulated by operator
On good front panel, welding current gives the decision of potentiometer signal Ug.During welding, by current detecting ring or T2 Current Mutual Inductance
Device, be can detect that by current detecting and rectification transformating circuit the transformer primary current signal in inverter main circuit, i.e. electric current are negative
Feedback signal Ufi.This current negative feedback signal Ufi, can compare with welding current Setting signal Ug.Difference letter after Bi compare
Number, by the output characteristics control circuit in accompanying drawing 3, carry out PI(ratio and integration) regulation control.The output control of its output
The pulse width of U2 PWM chip or dutycycle output.By the drive circuit of IGBT, in control inverter main circuit, IGBT's is logical
Break time, final decision welding machine output electric current and the size of voltage, it is achieved the accurate control of output current parameters.And make welding machine
Output characteristics is the dropping characteristic dragged outside constant current band.Say further, when welding current Setting signal Ug is constant, along with welding machine
Negative feedback Ufi current signal that electric circuit inspection arrives increases, and, after reaching given setting value, welding current gives Ug signal
Can increase with electric current with the difference of Ufi current feedback control signal and reduce, after PI control, make welding machine export PWM core
The pulse width of sheet or dutycycle reduce, and the output voltage of welding machine reduces.This process, the most so-called current cut-off is negative anti-
Feedback controls.The feedback control i.e. only just worked after electric current reaches the setting value of welding current potentiometer.Work as welding current
During Setting signal change, Current cut-off negative feedback setting value is different, but other control process is similar.So, at current potential
Between the minimum and maximum that device sets, so that it may obtain without several negative characteristic curves.If unclamping arc welding gun switch to prepare not carry out
During welding, 2Q2 can end, and 2Q1 can turn on, and welding machine can be made to close output.But, due to the time-lag action of 2R2,2C2 and 2C3,
DF electromagnetic valve can more delayed time stopping actions, which achieves the delayed control of holding one's breath of argon arc welding.Above control process,
Also it is the basic demand meeting argon arc welding welding.
About welding machine in two kinds of welding methods, the work process of other parts circuit, owing to above section has been carried out
Many explanations.The most no longer it is described in detail.
About overtemperature protection control, carry out some explanations below.In welding machine output procedure, when the radiator of IGBT occurs
During superheating phenomenon, or when (being close to the radiator installation of IGBT) the critesistor RT2D inspection in Thermal protection detection and control circuit
Measure the radiator of IGBT overheated time, overturn by the operational amplifier state in Thermal protection detection and control circuit, make three poles
Pipe Q5 turns on, and welding overtemperature protection indication LED Y lamp on circuit boards is lighted；The overheated instruction of welding machine panel being connected with CN2
LED (yellow) is lighted.Meanwhile, the lumination of light emitting diode in IC8, its internal triode ON.The output letter of optocoupler IC8
Number, it is connected to output characteristics control circuit.By this circuit, the pulse output of U2 PWM chip can be closed, make welding machine stop defeated
Go out electric current.Under the effect of cooling blower, when superheating phenomenon eliminates, control circuit just can continue to put out pwm control signal.With
Time overheating indicator lamp (yellow) extinguish.Which achieves welding machine overtemperature protection.
About the circuit anti-interference measure of this utility model welding machine, mainly there is the following aspects:
1) input filter.Seeing accompanying drawing 2, input filter circuit is made up of filter capacitor C61.Mainly do from electrical network
Disturb signal to be filtered, reduce or reduce the adverse effect that welding machine control circuit of the present invention is worked by interference signal.
2) output filtering.Seeing accompanying drawing 2, output filter circuit is by exporting current filtering inductance L2, filter capacitor C45 and C46
Composition.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 switchs
Device, during break-make control, can produce spike interference signal.These interference signals are in parallel at IGBT device two ends
Resistance and electric capacity (such as R22, C21；R25、C24；C15 ~ C16 etc.) anti-jamming circuit reduced or controlled.And it is in parallel
Resistance at fast recovery diode device D8 ~ D11, D23 ~ D24 two ends and electric capacity are (such as R27, C26；R26、C25；C44 etc.) anti-
Interference circuit then can reduce the spike interference signal in fast recovery diode switching process.
Additionally, at structure design aspect, the also measure of electromagnetic shielding.Panel 3 of the present utility model stands and is arranged on
On base plate.The part such as inversion and control circuit is equivalent to outside the metal formed by shell 2, base plate 11 and rear board 10, front panel
Shell surrounds.The isolation effect such as strong electromagnetic, limit electromagnetic radiation can be played.
Above-mentioned measure is to ensure that an important prerequisite of the welding machine product work reliability that circuit of the present invention makes.
It is above the brief control process of each circuit part of this utility model welding machine and argon arc welding and manual metal-arc welding method
Explanation.Owing to this utility model has been presented for the detailed circuit schematic diagram of accompanying drawing 2 and accompanying drawing 3, therefore, for there being circuit to read
For the people of ability (or possessing interlock circuit knowledge), can understand completely.Circuit diagram is exactly a kind of noiseless language.But
It is that, for not having the people of circuit reading ability (or not possessing interlock circuit knowledge), even if that explains is the most, they are also
Elusive.In view of the relation of length, main part can only be illustrated herein, so that what reader better understood when to be correlated with
Operation principle and process.
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. control, and, the complete machine knot of designed control circuit and welding machine
Structure, is all to make this utility model welding machine product meet security credential requirement, has the root of the technical advantages such as good control performance
This reason place, is also to meet product efficiently and low-cost production, high reliability, the important guarantor of manufacturing process technology advance
Barrier.The content of this utility model patent application protection is that the structure protecting this welding machine designs.
Additionally, connect simple between circuit board of the present utility model, on circuit board, device is much to use automatic placement machine
Completing processing with inserter, its manufacturing process and production technology are greatly simplified, reduce product weight, production and cost of transportation.
Above content be combine concrete machine structure and circuit board and control function this utility model is made detailed
Explanation, it is impossible to assert that of the present utility model being embodied as is only limited to these explanations.To its of technical field described in the utility model
For he technical staff, without departing from the inventive concept of the premise, it is also possible to make some other deduction and conversion, these
All should be considered as belonging to the category of this utility model protection.
Claims (6)
1. the IGBT single-tube contravariant formula argon arc welding of band high-frequency arc strike and the dual-purpose machine of manual metal-arc welding, including housing portion, front panel
Partly, rear board part and internal control plate part, it is characterised in that: the big panel of described panel part stands to be installed
On the base plate of housing portion, panel part is divided into two pieces, and little panel is to be directly welded on big panel by plug-in unit
's；Described panel part mainly include inverter main circuit, output filter circuit, switching power circuit, IGBT drive circuit,
Current detecting and rectification transformating circuit, Thermal protection detection and control circuit, given value of current circuit, solenoid valve control circuit, high frequency
Arc ignition control circuit, striking current control circuit, output characteristics control circuit, wherein output characteristics control circuit layout is in little control
In making sheet, other circuit then layout is on big panel.
The IGBT single-tube contravariant formula argon arc welding of a kind of band high-frequency arc strike the most as claimed in claim 1 and the dual-purpose machine of manual metal-arc welding, its
Be characterised by: described high-frequency arc strike control circuit part, by HEF40106 chip, 817 optocouplers, high voltage package, striking transformator,
SD, high-voltage capacitance, metal-oxide-semiconductor, and a lot of resistance of these device periphery, electric capacity and diode component composition.
The IGBT single-tube contravariant formula argon arc welding of a kind of band high-frequency arc strike the most as claimed in claim 1 and the dual-purpose machine of manual metal-arc welding, its
Be characterised by: big control circuit plate be provided with inverter main circuit, output filter circuit, switching power circuit, IGBT drive circuit,
Current detecting and rectification transformating circuit, Thermal protection detection and control circuit, given value of current circuit, solenoid valve control circuit, high frequency
Arc ignition control circuit, striking current control circuit, between each circuit, circuit connects.
The IGBT single-tube contravariant formula argon arc welding of a kind of band high-frequency arc strike the most as claimed in claim 1 and the dual-purpose machine of manual metal-arc welding, its
It is characterised by: described housing portion includes shell and base plate.
The IGBT single-tube contravariant formula argon arc welding of a kind of band high-frequency arc strike the most as claimed in claim 1 and the dual-purpose machine of manual metal-arc welding, its
It is characterised by: be provided with in described rear board part: on and off switch, connection the argon inlet mouth of electromagnetic valve, power supply line
And plug, rear plastic panel, cooling fan；Power line and plug are connected to power supply grid, and on and off switch controls welding machine electric power
On-off, cooling fan is positioned at the rear portion of welding machine, and the cold wind air inlet from welding machine rear portion is carried out, and can make left side circuit part
Some heater members or parts are preferably cooled down.
The IGBT single-tube contravariant formula argon arc welding of a kind of band high-frequency arc strike the most as claimed in claim 1 and the dual-purpose machine of manual metal-arc welding, its
It is characterised by: be provided with on described front-facing portion: plastic front panel or front cover, output snap joint holder assembly, connection
The argon outlet nozzle of argon-arc welding gun, working power display lamp, Thermal protection status indicator lamp, argon arc welding (TIG)/manual metal-arc welding (MMA)
Function switch, manual welding electric current output regulator potentiometer, two groups of output snap joint holder assemblies are when manual electric arc welding
Connect welding clamp cable and workpiece clamp cable respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521099400.9U CN205496750U (en) | 2015-12-28 | 2015-12-28 | IGBT single tube inverter type argon arc of height striking frequently weld with dual -purpose machine of manual metal -arc welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521099400.9U CN205496750U (en) | 2015-12-28 | 2015-12-28 | IGBT single tube inverter type argon arc of height striking frequently weld with dual -purpose machine of manual metal -arc welding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205496750U true CN205496750U (en) | 2016-08-24 |
Family
ID=56721565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521099400.9U Expired - Fee Related CN205496750U (en) | 2015-12-28 | 2015-12-28 | IGBT single tube inverter type argon arc of height striking frequently weld with dual -purpose machine of manual metal -arc welding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205496750U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106695071A (en) * | 2016-12-30 | 2017-05-24 | 唐山松下产业机器有限公司 | Arc striking control method and device |
| CN106735742A (en) * | 2016-12-22 | 2017-05-31 | 浙江肯得机电股份有限公司 | It is a kind of that there are six anti-and good striking performance inverter argon arc welding machines |
| CN109262119A (en) * | 2018-10-23 | 2019-01-25 | 成都埃森普特科技股份有限公司 | A kind of plasma cutting machine pilot arc current control circuit and method |
| CN109894724A (en) * | 2019-04-01 | 2019-06-18 | 广州市金象工业生产有限公司 | A kind of electric welding that band is shown, argon arc welding auto-manual Intelligent welder |
| CN114273752A (en) * | 2021-12-10 | 2022-04-05 | 深圳市佳士科技股份有限公司 | Thermal arc striking control method of welding machine, welding machine driving circuit and welding machine |
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2015
- 2015-12-28 CN CN201521099400.9U patent/CN205496750U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735742A (en) * | 2016-12-22 | 2017-05-31 | 浙江肯得机电股份有限公司 | It is a kind of that there are six anti-and good striking performance inverter argon arc welding machines |
| CN106695071A (en) * | 2016-12-30 | 2017-05-24 | 唐山松下产业机器有限公司 | Arc striking control method and device |
| CN109262119A (en) * | 2018-10-23 | 2019-01-25 | 成都埃森普特科技股份有限公司 | A kind of plasma cutting machine pilot arc current control circuit and method |
| CN109262119B (en) * | 2018-10-23 | 2024-04-19 | 山西万流金属制品有限公司 | Guide arc current control circuit and method for plasma cutting machine |
| CN109894724A (en) * | 2019-04-01 | 2019-06-18 | 广州市金象工业生产有限公司 | A kind of electric welding that band is shown, argon arc welding auto-manual Intelligent welder |
| CN109894724B (en) * | 2019-04-01 | 2022-04-15 | 广州金象实业集团有限公司 | Manual-automatic integrated intelligent welding machine with display for electric welding and argon arc welding |
| CN114273752A (en) * | 2021-12-10 | 2022-04-05 | 深圳市佳士科技股份有限公司 | Thermal arc striking control method of welding machine, welding machine driving circuit and welding machine |
| CN114273752B (en) * | 2021-12-10 | 2023-06-02 | 深圳市佳士科技股份有限公司 | Thermal arc striking control method suitable for inversion manual welding machine and welding machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20160824 Termination date: 20211228 |