CN205888327U - CO2 gas shiled welding machine control circuit - Google Patents
CO2 gas shiled welding machine control circuit Download PDFInfo
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- CN205888327U CN205888327U CN201620755613.0U CN201620755613U CN205888327U CN 205888327 U CN205888327 U CN 205888327U CN 201620755613 U CN201620755613 U CN 201620755613U CN 205888327 U CN205888327 U CN 205888327U
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Abstract
The utility model relates to a CO2 gas shiled welding machine control circuit. A CO2 gas shiled welding machine control circuit, includes main circuit module and PWM control module, and main circuit module includes IGBT inverter circuit, and PWM control module and IGBT inverter circuit connect, still include the protective film piece, include: the unit is judged to the feedback, and main circuit module's output signal feedback end is connected to the input for main circuit module's operating condition is judged according to main circuit module's output feedback signal, time the control unit, the output that the unit is judged to the feedback is connected to the input for duration according to main circuit module's operating condition control operating condition, and output control unit, input connect hours the control unit's output, PWM control module's input is connected to the output for control PWM control module's output. An above -mentioned reliability and security that CO2 gas shiled welding machine control circuit can improve CO2 gas shiled welding machine.
Description
Technical field
This utility model is related to welding machine technical field, more particularly to co2The control circuit of gas shielded welding machine.
Background technology
Shield carbon-dioxide arc welding (abbreviation co2Weldering) it is with carbon dioxide as protective gas, the side welded
Method.Simple to operate in application aspect, suitable automatic welding and comprehensive welding.During welding, wind loading rating is poor, suitable office operation.By
In its low cost, carbon dioxide easily produces, and is widely used in Ge great small enterprise.Thermal physical characteristic due to carbon dioxide
The Special Influence of energy, during using normal welding power supply, end of welding head fusing metal is not likely to form the axially free transition of balance,
Typically require quick-fried disconnected using short circuit and molten drop necking down.Because protective gas used is cheap, become using weld seam during short circuiting transfer
Shape is good, adds the good quality solder joints that can obtain no internal flaw using the welding wire containing deoxidizer.Therefore this welding
Method has become one of most important welding method of ferrous material at present.
Due to co2The short circuit current of gas shielded welding machine general all in 750a～900a, power is very big and main power device
Igbt module, the temperature of main transformer rise quickly.During normal weld work, short circuit current is only gone out with transient state (much smaller than 500ms)
Existing, but in test, unconventional test or maloperation, the short circuit current persistent period may be long, the damage of igbt module
Bad rate can substantially rise.
Utility model content
Based on this it is necessary to be directed to the control problem of above-mentioned short circuit current persistent period, provide a kind of co2Gas shielded welding machine
Control circuit.
A kind of co2Gas shielded welding machine control circuit, including main circuit module and pwm control module, described main circuit module
Including igbt inverter circuit, described pwm control module and described igbt inverter circuit connect, for controlling described igbt inversion electricity
The break-make on road, also includes protection module, and described protection module includes:
Feedback judging unit, the input of described feedback judging unit connects the output signal feedback of described main circuit module
End, for judging the working condition of described main circuit module according to the output feedback signal of described main circuit module；
Time control unit, the input of described time control unit connects the outfan of described feedback judging unit, uses
Persistent period in working condition described in the working state control according to described main circuit module；And
Output control unit, the input of described output control unit connects the outfan of described time control unit, institute
The outfan stating output control unit connects the input of described pwm control module, for controlling the defeated of described pwm control module
Go out.
Above-mentioned co2The control circuit of gas shielded welding machine, judges main circuit module by the feedback judging unit of protection module
Working condition, then pass through time control unit according to the working condition of main circuit module, control continuing of this working condition
Time, and control output control unit to pass through the break-make to igbt inverter circuit for the pwm control module realization according to the time setting
Control so that co2Gas shielded welding machine can automatically switch after persistently a certain working condition certain time, thus avoiding co2Gas
Protection welding machine is in a certain particular job state, such as short circuiting work state for a long time, leads to the power model of main circuit module,
Such as igbt inverter circuit is overheated, improves the safety and reliability of main circuit module.
Wherein in an embodiment, described feedback judging unit is used for judging described master according to described output feedback signal
Whether circuit module is in output short-circuit working condition or without output state；Described time control unit is used for controlling described master
Circuit module is in the persistent period of described output short-circuit state or described without output state；Described output control unit is used for
Described pwm control module is controlled to be output as zero when the described output short-circuit working condition persistent period is more than the first Preset Time,
Control described pwm control module to recover output when the described without output state persistent period is more than the second Preset Time.
Wherein in an embodiment, described feedback judging unit includes the first operational amplifier, and described first computing is put
The positive input of big device inputs the output feedback signal of main circuit module；The reverse input end of described first operational amplifier connects
Reference voltage, the outfan of described first operational amplifier connects the input of described time control unit.
Wherein in an embodiment, described feedback judging unit also includes second resistance and the first adjustable resistance, described
The first end of second resistance connects power supply, the reverse input end of the second end of described second resistance and described first operational amplifier
And the first end of described first adjustable resistance connects, the second end ground connection of described first adjustable resistance.
Wherein in an embodiment, described time control unit includes the first to the 3rd diode, the 3rd to the 5th electricity
Resistance and the first electric capacity, the positive pole of described first diode connects the outfan of described feedback decision circuitry, described one or two pole
The negative pole of pipe connects one end of the negative pole, the positive pole of described 3rd diode and described 3rd resistor of described second diode,
The positive pole of described second diode passes through the positive pole that described 4th resistance connects described first electric capacity, described 3rd diode negative
The positive pole that described 5th resistance connects described first electric capacity is passed through in pole；The minus earth of described first electric capacity；Described 3rd resistor
Other end ground connection, the positive pole of described first electric capacity is as the outfan of described time control unit.
Wherein in an embodiment, described output control unit includes the first chip and the 4th diode, described time
The outfan of control unit connects the input of described first chip, and the outfan of described first chip connects described four or two pole
The negative pole of pipe, described 4th diode cathode connects the input of described pwm control module.
Wherein in an embodiment, described first chip is 555 chips.
Wherein in an embodiment, including program board, described program panel include feedback signal input terminal and
Pwm control signal outfan, described protection module is integrated on described program panel, and described feedback signal input terminal connects institute
State the output signal feedback end of main circuit module.
Wherein in an embodiment, the output feedback signal of described main circuit module includes output current feedback signal
And/or output voltage feedback signal.
Brief description
Fig. 1 is the co of this utility model one embodiment2The circuit diagram of gas shielded welding machine control circuit；
Fig. 2 is the circuit diagram of the protection module of embodiment illustrated in fig. 1.
Specific embodiment
Understandable for enabling above-mentioned purpose of the present utility model, feature and advantage to become apparent from, below in conjunction with the accompanying drawings to this
The specific embodiment of utility model is described in detail.Elaborate a lot of details in order to abundant in the following description
Understand this utility model.But this utility model can be much to implement different from alternate manner described here, this area
Technical staff can do similar improvement without prejudice in the case of this utility model intension, and therefore this utility model is not subject to following public affairs
The restriction being embodied as opened.
Referring to Fig. 1, it is the co of this utility model one embodiment2The circuit diagram of gas shielded welding machine control circuit.As figure
Shown, this co2Gas shielded welding machine control circuit 100 includes main circuit module 110, pwm control module 120 and protection module
130.Main circuit module 110 includes igbt inverter circuit 111, and pwm control module 120 and this igbt inverter circuit 111 connect, and use
In the break-make controlling igbt inverter circuit 111, the input of protection module 130 connects the outfan of main circuit module 110, is used for
Receive the output feedback signal of main circuit module 110, the outfan of protection module 130 connects the input of pwm control module 120
End, for controlling the output of pwm module 120, and then controls the break-make of igbt inverter circuit 111.Wherein protection module 130 includes
Feedback judging unit 131, time control unit 132 and output control unit 133.The input of this feedback judging unit 131
Connect the output signal feedback end of main circuit module 110, for main electricity is judged according to the output feedback signal of main circuit module 110
The working condition of road module 110.The input of time control unit 132 connects the outfan of feedback judging unit 131, for root
Persistent period according to this working condition of working state control of main circuit module 110.The input of output control unit 133 connects
The outfan of time control unit 132, the outfan of output control unit 133 connects the input of pwm control module 120, uses
In the output controlling this pwm control module 120.
Such co2The control circuit of gas shielded welding machine, judges master by the feedback judging unit 131 of protection module 130
The working condition of circuit module 110, then passes through the working condition according to main circuit module 110 for the time control unit 132, controls
The persistent period of this working condition, and it is real to control output control unit 133 to pass through pwm control module 120 according to the default time
The now control to the break-make of igbt inverter circuit 111 is so that co2Gas shielded welding machine 100 can be in persistently a certain working condition one
Automatically switch after fixing time, thus avoiding co2Gas shielded welding machine 100 is in a certain particular job state for a long time, such as short circuit
Working condition, leads to the power model of main circuit module, and such as igbt inverter circuit is overheated, improves the safety of main circuit module
Property and reliability.
Further, in the present embodiment, feedback judging unit 131 is used for judging main circuit mould according to output feedback signal
Whether block 110 is in output short-circuit working condition or without output state.Time control unit 132 is used for controlling main circuit module
110 persistent period being in output short-circuit state or without output state.Output control unit 133 is used in output short-circuit work
State duration is output as zero more than control pwm control module 120 during the first Preset Time；In the without output state persistent period
Recover output more than controlling pwm control module 120 during the second Preset Time.I.e. when time control unit 132 judges main circuit mould
More than the first Preset Time, during such as 3s, this output control unit 133 controls pwm to control to block 110 output short-circuit working condition
The a point of module 120 is output as zero, and then controls igbt inverter circuit 111 to disconnect, and then controls not having of main circuit module 110
Output, the working condition of main circuit module 110 is switched to without output state.Thus it is long-time to avoid main circuit module 110
It is in output short-circuit working condition it is ensured that the safety of main circuit module 111, reduce the spoilage of igbt inverter circuit 111, carry
The high reliability of main circuit module 111.And work as time control unit 132 and judge main circuit module 110 no output services state
More than the second Preset Time, during such as 15s, this output control unit 133 controls pwm control module 120 to recover output, and then controls
Igbt inverter circuit 111 processed connects, and then recovers the output of main circuit module 110 so that main circuit module 110 recovers to enter work
Make state.
So further can automatically realize co2The short-circuit protection of gas shielded welding machine, it is to avoid be in short circuit for a long time
Output state, reduces the spoilage of igbt inverter circuit 111, simultaneously after protection rest certain time, can automatically recover
Short-circuit output state, realizes rest and the automatic switchover of work, substantially increases work efficiency, and improve main circuit module
110 safety and reliability.
Refer to Fig. 2, be the circuit diagram of the protection module of embodiment illustrated in fig. 1, as shown in Fig. 2 this feedback judges
Unit 131 includes the first operational amplifier ic1, this first operational amplifier ic1Positive input input main circuit module 110
Output feedback signal.This feedback signal can be output current feedback and/or output voltage feedback.Output current feeds back signal
Can be obtained by Hall element.This first operational amplifier ic1Reverse input end connect reference voltage, the first operation amplifier
Device ic1Outfan Connection Time control unit 132 input.By such feedback judging unit 131, when this first fortune
Calculate amplifier ic1Positive input detect main circuit module 110 be output short-circuit state when, this first operational amplifier ic1
Positive input voltage be higher than its reverse input end voltage, thus this first operational amplifier ic1Outfan electricity
Pressure is changed into 15v from 0v, provides the output signal to time control unit 132.Conversely, as the first operational amplifier ic1Forward direction defeated
When entering end and main circuit module 110 is detected and no export, now this first operational amplifier ic1The voltage of reverse input end be higher than
The voltage of its positive input, thus this first operational amplifier ic1The voltage of outfan 0v is changed into from 15v.Thus realizing
Judgement to the working condition of main circuit module 110.
Wherein in an embodiment, this feedback judging unit 131 also includes second resistance r2With the first adjustable resistance rw,
This second resistance r2First end connect power supply, such as supply voltage be+15v, second resistance r2The second end and the first computing put
Big device ic1Reverse input end and the first adjustable resistance rwFirst end connect, the first adjustable resistance rwSecond end ground connection.
Such first operational amplifier ic1Reference voltage can pass through second resistance r2With the first adjustable resistance rwSet and adjusted
Section, thus more flexible, improve adaptability.
Refer to Fig. 2, this time control unit 132 includes the first to the 3rd diode d1～d3, the 3rd to the 5th resistance r3
～r5And the first electric capacity c1, this first diode d1Positive pole connect feedback decision circuitry 131 outfan, in the present embodiment
In, i.e. the first operational amplifier ic1Outfan.First diode d1Negative pole connect the second diode d2Negative pole, the three or two
Pole pipe d3Positive pole and 3rd resistor r3One end, the second diode d2Positive pole pass through the 4th resistance r4Connect the first electric capacity c1
Positive pole, this first electric capacity is the electric capacity with electrode.3rd diode d3Negative pole pass through the 5th resistance r5Connect this first electricity
Hold c1Positive pole.First electric capacity c1Minus earth.3rd resistor r3The other end ground connection.This first electric capacity c1Positive pole conduct
The outfan of time control unit 132.So, in the present embodiment, when main circuit module 110 short circuit, feed back judging unit
131 are output as positive voltage 15v, and now this voltage 15v is through the first diode d1, the 3rd diode d3And the 5th resistance r5Right
First electric capacity c1Charge, such as the first electric capacity c1Voltage when being charged to the first Preset Time, the such as first electric capacity c1The electricity at two ends
When pressure reaches the first predeterminated voltage, during such as 10v, then output control unit 132 is controlled to control the output of pwm control module 120,
So that pwm control module 120 controls igbt inverter circuit 111 to disconnect, realize closing the purpose of igbt inverter circuit 111,
Enter resting state, main circuit module 110 does not export.At this moment feedback judging unit 131 is output as 0v, the first electric capacity c1On
The electricity of storage crosses the 4th resistance r all4, the second diode d2And 3rd resistor r3Release, as the first electric capacity c1The voltage at two ends
When being discharged into the second Preset Time, the such as first electric capacity c1When the voltage at two ends is reduced to the second predeterminated voltage, during such as 5v, control
Igbt inverter circuit 111 processed turns on again, recovers normal work, and main circuit module 111 recovers output.Wherein, the first electric capacity c1
Charging interval, that is, the first Preset Time can pass through the 5th resistance r5Resistance and the first electric capacity c1Capacity determine；First electricity
Hold c1Discharge time, that is, the second Preset Time can pass through the 4th resistance r4With 3rd resistor r3Resistance determine.So, may be used
Stopped in short circuiting work and time-out with by the setting to the first Preset Time and the second Preset Time, realizing main circuit module 111
Switch between the state of breath, neither impact normal weld and test, the short circuit current simultaneously exporting is subject to time control it is ensured that machine
The reliability of device.
Refer to Fig. 2, this output control unit 133 can include the first chip ic2With the 4th diode d4, time control
The outfan of unit 132 connects the first chip ic2Input, the first chip ic2Outfan connect the 4th diode d4's
Negative pole, the 4th diode d4Positive pole connects the input of pwm control module 120.Preferably, this first chip ic2For 555 chips.
So, such as the output voltage of time control unit 132, i.e. the first electric capacity c1When the voltage at two ends is charged to about 10v, this first
Chip ic2Output be changed into low level, thus controlling pwm control module 120 not export, igbt inverter circuit 111 disconnects.When
The output voltage of time control unit 132, i.e. the first electric capacity c1When the voltage at two ends drops to about 5v, this first chip ic2Output
It is changed into high level, now pwm control module 120 recovers output, igbt inverter circuit 111 is resumed work.
Refer to Fig. 1, in the present embodiment, this co2Gas shielded welding machine control circuit 100, can also include programme-control
Plate 140, this program board 140 includes feedback signal input terminal and pwm control signal outfan, and protection module 130 is integrated in
On program board 140, feedback signal input terminal connects the output signal feedback end of main circuit module 110, such as passes through in Fig. 1
B point and c point obtain output current feedback and the output voltage feedback of main circuit module 110 respectively, by output current feedback and
The combination of output voltage feedback judges, to judge that this main circuit module 110 is in short-circuit output state or without output state,
And coherent signal is inputted protection module 130.More can accurately feed back the work of main circuit module 110 by program board
Make state, ensure that co2The reliability of gas shielded welding machine and safety.In addition on this program board can also integrated its
His circuit, thus further increase the compactedness of circuit.
Each technical characteristic of embodiment described above can arbitrarily be combined, for making description succinct, not to above-mentioned reality
The all possible combination of each technical characteristic applied in example is all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all it is considered to be the scope of this specification record.
Embodiment described above only have expressed several embodiments of the present utility model, and its description is more concrete and detailed,
But therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that the common skill for this area
For art personnel, without departing from the concept of the premise utility, some deformation can also be made and improve, these broadly fall into
Protection domain of the present utility model.Therefore, the protection domain of this utility model patent should be defined by claims.
Claims (9)
1. a kind of co2Gas shielded welding machine control circuit, including main circuit module and pwm control module, described main circuit module includes
Igbt inverter circuit, described pwm control module and described igbt inverter circuit connect, for controlling described igbt inverter circuit
It is characterised in that also including protection module, described protection module includes break-make:
Feedback judging unit, the input of described feedback judging unit connects the output signal feedback end of described main circuit module,
For judging the working condition of described main circuit module according to the output feedback signal of described main circuit module；
Time control unit, the input of described time control unit connects the outfan of described feedback judging unit, for root
Persistent period according to working condition described in the working state control of described main circuit module；And
Output control unit, the input of described output control unit connects the outfan of described time control unit, described defeated
The outfan going out control unit connects the input of described pwm control module, for controlling the output of described pwm control module.
2. co according to claim 12Gas shielded welding machine control circuit is it is characterised in that described feedback judging unit is used for
Judge whether described main circuit module is in output short-circuit working condition or without output state according to described output feedback signal；
Described time control unit is used for controlling described main circuit module to be in described output short-circuit state or described without output state
Persistent period；Described output control unit is used in the described output short-circuit working condition persistent period more than the first Preset Time
When control described pwm control module to be output as zero, when the described without output state persistent period is more than the second Preset Time control
Described pwm control module recovers output.
3. co according to claim 12Gas shielded welding machine control circuit is it is characterised in that described feedback judging unit includes
First operational amplifier, the positive input of described first operational amplifier inputs the output feedback signal of main circuit module；Institute
The reverse input end stating the first operational amplifier connects reference voltage, and the outfan of described first operational amplifier connects the described time
The input of control unit.
4. co according to claim 32Gas shielded welding machine control circuit is it is characterised in that described feedback judging unit also wraps
Include second resistance and the first adjustable resistance, the first end of described second resistance connects power supply, the second end of described second resistance and
The first end of the reverse input end of described first operational amplifier and described first adjustable resistance connects, described first adjustable electric
Second end ground connection of resistance.
5. co according to claim 12Gas shielded welding machine control circuit is it is characterised in that described time control unit includes
First to the 3rd diode, the 3rd to the 5th resistance and the first electric capacity, the positive pole of described first diode connects described feedback
The outfan of decision circuitry, the negative pole of described first diode connects the negative pole of described second diode, described 3rd diode
Positive pole and described 3rd resistor one end, the positive pole of described second diode passes through described 4th resistance and connects described first
The positive pole of electric capacity, the negative pole of described 3rd diode passes through the positive pole that described 5th resistance connects described first electric capacity；Described
The minus earth of one electric capacity；The other end ground connection of described 3rd resistor, the positive pole of described first electric capacity is as described time control
The outfan of unit.
6. co according to claim 12Gas shielded welding machine control circuit is it is characterised in that described output control unit includes
First chip and the 4th diode, the outfan of described time control unit connects the input of described first chip, and described the
The outfan of one chip connects the negative pole of described 4th diode, and described 4th diode cathode connects described pwm control module
Input.
7. co according to claim 62Gas shielded welding machine control circuit is it is characterised in that described first chip is 555 cores
Piece.
8. co according to claim 12Gas shielded welding machine control circuit is it is characterised in that including program board, described
Program board includes feedback signal input terminal and pwm control signal outfan, and described protection module is integrated in described program control
In making sheet, described feedback signal input terminal connects the output signal feedback end of described main circuit module.
9. co according to claim 12Gas shielded welding machine control circuit is it is characterised in that the output of described main circuit module
Feedback signal includes output current feedback signal and/or output voltage feedback signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620755613.0U CN205888327U (en) | 2016-07-18 | 2016-07-18 | CO2 gas shiled welding machine control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620755613.0U CN205888327U (en) | 2016-07-18 | 2016-07-18 | CO2 gas shiled welding machine control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205888327U true CN205888327U (en) | 2017-01-18 |
Family
ID=57774099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620755613.0U Expired - Fee Related CN205888327U (en) | 2016-07-18 | 2016-07-18 | CO2 gas shiled welding machine control circuit |
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| CN (1) | CN205888327U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114160925A (en) * | 2021-12-07 | 2022-03-11 | 深圳市麦格米特焊接技术有限公司 | Current blocking method and device, welding system and welding machine |
-
2016
- 2016-07-18 CN CN201620755613.0U patent/CN205888327U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114160925A (en) * | 2021-12-07 | 2022-03-11 | 深圳市麦格米特焊接技术有限公司 | Current blocking method and device, welding system and welding machine |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170118 Termination date: 20210718 |
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| CF01 | Termination of patent right due to non-payment of annual fee |