CN117001111A - Self-adaptive arc striking current control method and circuit for inverter welding power supply - Google Patents

Self-adaptive arc striking current control method and circuit for inverter welding power supply Download PDF

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Publication number
CN117001111A
CN117001111A CN202311001895.6A CN202311001895A CN117001111A CN 117001111 A CN117001111 A CN 117001111A CN 202311001895 A CN202311001895 A CN 202311001895A CN 117001111 A CN117001111 A CN 117001111A
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China
Prior art keywords
current
welding
arc striking
circuit
thickness
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CN202311001895.6A
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请求不公布姓名
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Shanghai Hugong Electric Group Co Ltd
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Shanghai Hugong Electric Group Co Ltd
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Priority to CN202311001895.6A priority Critical patent/CN117001111A/en
Publication of CN117001111A publication Critical patent/CN117001111A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
    • B23K9/1006—Power supply
    • B23K9/1043—Power supply characterised by the electric circuit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/32—Accessories
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding Control (AREA)

Abstract

The application discloses a self-adaptive arc striking current control method and a circuit of an inverter welding power supply. The control processing circuit is connected with the current setting circuit and the welding current detection circuit, and when the welding current is equal to the setting current, the control processing circuit increases arc striking pulses on the control pulses, improves the welding current output to generate arc striking, improves the arc striking success rate and realizes the self-adaptive control of the arc striking.

Description

Self-adaptive arc striking current control method and circuit for inverter welding power supply
Technical Field
The application relates to the technical field of welding power sources, in particular to a self-adaptive arc striking current control method and circuit of an inverter welding power source.
Background
At present, in general inverter welding power supplies, constant current is mostly adopted to realize control of preheating striking current of the inverter welding power supply, but when welding materials are different in thickness, the constant striking current cannot realize proper striking, when the welding materials are relatively thin, the constant striking current is relatively large relative to the welding materials, so that perforation of the welding materials can be caused, and when the welding materials are relatively thick, the constant striking current is relatively small relative to the welding materials, the welding materials cannot be heated well, and the result that the striking cannot be realized is caused.
In fact, when the welding material is thin, the required arc striking current is relatively small, the correspondingly adopted tungsten electrode is relatively thin, the required tungsten electrode preheating arc striking current is small, and for a welding material with a certain thickness, the required arc striking current is relatively large, the correspondingly adopted tungsten electrode is relatively thick, the thicker tungsten electrode needs larger preheating current, namely the thickness of the welding material is related to the diameter of the tungsten electrode, the magnitude of the arc striking current is related to the thickness of the welding material, and the constant arc striking current is adopted, so that the arc striking problems of welding materials with different thicknesses and different plate thicknesses cannot be simultaneously considered.
Therefore, how to adaptively adjust the arc striking current according to the thickness of the welding material is a current urgent problem to be solved.
Disclosure of Invention
The application aims to provide a self-adaptive arc striking current control method and a circuit of an inverter welding power supply, wherein welding materials are segmented according to thickness, different arc striking currents are adopted in each segment, the arc striking currents correspond to the thickness of the welding materials, set currents are set, welding currents are compared with the set currents, when the welding currents are equal to the set currents, the corresponding arc striking currents are output according to the thickness of the welding materials, the arc striking success rate is improved, and the self-adaptive control of the arc striking is realized.
In a first aspect, the above object of the present application is achieved by the following technical solutions:
a self-adaptive arc striking current control method of an inverter welding power supply comprises the steps of setting a set current, detecting the welding current, setting the magnitude of the arc striking current according to the function relation between the thickness of a welding material and the arc striking current when the welding current is equal to the set current, and outputting an arc striking pulse.
The application is further provided with: segmenting according to the thickness of the welding material, and determining the magnitude of the arc striking current by adopting different functional relations between the thickness of the welding material and the arc striking current in different segments.
The application is further provided with: setting the arc striking current as a first current set value when the thickness of the welding material is smaller than or equal to a first thickness value; setting the arc striking current as a second current set value when the thickness of the welding material is larger than a second thickness value; when the thickness of the welding material is larger than the first thickness value and smaller than or equal to the second thickness value, the arc striking current and the welding current are set to form a linear relation, the value of the arc striking current is located between the first current set value and the second current set value, and the second current set value is larger than the first current set value.
The application is further provided with: when the thickness of the welding material is larger than the first thickness value and smaller than or equal to the second thickness value, the arc striking current is located between the first current set value and the second current set value, and the linear relation between the arc striking current and the welding current is shown as the following formula:
arc striking current = K x welding current + a;
wherein 0< K <1, a represents a first current set point.
In a second aspect, the above object of the present application is achieved by the following technical solutions:
the utility model provides an inverter welding power's self-adaptation striking current control circuit, including welding current detection circuit, the electric current sets up the circuit, control processing circuit and power supply circuit, power supply circuit includes first rectifier circuit that connects gradually, inverter circuit, transformer and second rectifier circuit, welding current detection circuit is connected to the output of second rectifier circuit, be used for sampling welding current, control processing circuit and inverter circuit, electric current sets up the circuit, welding current detection circuit is connected, be used for according to welding current and the comparison of setting for electric current, output control pulse, control inverter circuit's frequency, when welding current equals the setting for electric current, control processing circuit increases the striking pulse on control pulse, improve welding current output, realize striking.
The application is further provided with: the current setting circuit comprises a series resistor combination, one end of the series resistor combination is connected with a first power supply voltage, the other end of the series resistor combination is grounded, the series resistor combination comprises an adjustable resistor, and the adjustable end of the adjustable resistor is used as an output end of the current setting circuit and is connected to the control circuit.
The application is further provided with: the welding current detection circuit comprises a current sensor, a filter circuit and a reactance matching circuit which are sequentially connected, wherein the current sensor detects welding current, and the filter circuit filters the detected welding current and transmits the welding current to the control circuit through the reactance matching circuit.
The application is further provided with: the reactance matching circuit includes a follower for impedance matching.
The application is further provided with: the control processing circuit compares the detected welding current with a set current, and when the welding current is equal to the set current, the control pulse is output and the arc striking pulse corresponding to the thickness of the welding material is output according to the thickness of the welding material, so that the arc striking preheating current is improved.
In a third aspect, the above object of the present application is achieved by the following technical solutions:
an adaptive arc striking current control processing circuit terminal of an inverter welding power supply comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the computer program to realize the method.
Compared with the prior art, the application has the beneficial technical effects that:
1. according to the application, the arc striking current corresponds to the thickness of the welding material, and corresponding arc striking current is set for the welding materials with different thicknesses, so that the success rate of arc striking is improved;
2. furthermore, the application segments the welding material according to the thickness, and sets the arc striking current according to different arc striking current functions in each segment, thereby realizing the corresponding relation between the thickness of the welding material and the arc striking current;
3. furthermore, the application sets the setting current related to the thickness of the welding material for welding, and outputs the welding current and the striking current at the same time when the welding starts, thereby accurately matching the striking preheating current and improving the striking success rate.
Drawings
FIG. 1 is a schematic diagram of an inverter welding power supply control circuit according to one embodiment of the present application;
FIG. 2 is a schematic diagram of a set-current circuit according to an embodiment of the application;
FIG. 3 is a schematic diagram of a welding current detection circuit according to an embodiment of the application;
FIG. 4 is a graph illustrating arc initiation current as a function of thickness of a welding material in accordance with one embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the accompanying drawings.
The application discloses a self-adaptive arc striking current control circuit of an inverter welding power supply, which is shown in fig. 1 and comprises a welding current detection circuit, a current setting circuit, a control processing circuit and a power supply circuit, wherein the control processing circuit is respectively connected with the welding current detection circuit, the current setting circuit and the power supply circuit.
The power supply circuit comprises a first rectifying circuit, an inverter circuit, a transformer T and a second rectifying circuit which are sequentially connected, the inverter circuit comprises four power tubes, the four power tubes G1/G2/G3/G4 form a bridge circuit, the control poles of the power tubes are connected to the control circuit, the control circuit outputs PWM1 control signals to the control poles of the G1/G4 power tubes to enable the G1/G4 power tubes to be simultaneously conducted, current from top to bottom is applied to a primary coil of the transformer, PWM2 control signals to the control poles of the G2/G2 power tubes are output by the control circuit to enable the G2/G3 power tubes to be simultaneously conducted, current from bottom to top is applied to the primary coil of the transformer, and alternating current is transmitted to the secondary coil by the transformer T through mutual inductance.
The first rectifying circuit is used for converting commercial power alternating current into first direct current, the inverter circuit and the transformer convert the first direct current into high-frequency alternating current, and the second rectifying circuit rectifies the high-frequency alternating current to obtain direct current output voltage of the welding power supply.
The welding current detection circuit is connected to the direct current output, detects the current of the direct current output, obtains a current detection signal A2 after processing, and transmits the current detection signal A2 to the control processing circuit.
The current setting circuit is used for setting a current setting value according to the thickness of the welding material and outputting the current setting value to the control processing circuit.
When the welder is used for welding, the welding materials with the same material and the same thickness are adopted because of the influences of external factors such as the material of the welding materials, the welding speed, different welding machines and the like, or the welding current is influenced by different welding speeds when different welding machines are adopted, so the current setting value is an empirical value and is different due to human factors and the like.
For the sake of simple starting point, the application sets the current setting value when the same welder and the same person weld at the same speed, and the current setting value is different under different conditions.
The control processing circuit compares the welding current A2 with the set current A1, controls the PWM1/PWM2 frequency and the duty ratio of the inverter circuit according to the comparison result, and outputs a PWM1 control signal, a PWM2 control signal and an arc striking pulse when the welding current is equal to the set current, wherein the arc striking pulse is related to the thickness of the welding material and is used for increasing the preheating current and the welding current output and improving the arc striking success rate.
In one embodiment of the present application, the current setting circuit includes a series resistor combination for dividing the set voltage and transmitting the corresponding current value to the control processing circuit.
Specifically, as shown in fig. 2, the series resistor combination includes a first resistor R1, an adjustable resistor VR1 and a second resistor R2 that are sequentially connected, one end of the series resistor combination is connected to a power supply VDD, the other end is grounded, the adjustable end of the adjustable resistor VR1 is connected to a control processing circuit, the resistance value of the adjustable resistor VR1 changes, and the adjustable resistor VR1 corresponds to different voltages and also corresponds to different currents A1.
The welding current detection circuit comprises a current sensor circuit, a filter circuit and a reactance matching circuit, wherein the current sensor circuit is used for sampling welding current, the filter circuit is used for filtering the sampled welding current, the peak of the sampled welding current is eliminated, and the reactance matching circuit is used for matching the reactance between the filtered welding current and the control processing circuit and transmitting the welding current to the control processing circuit.
As shown in fig. 3, the current sensor circuit adopts a hall current sensor circuit, and the filter circuit includes a capacitor C1 and a third resistor R3 connected in parallel, and one end of the parallel combination is connected to the output of the sensor circuit, and the other end is grounded.
The reactance matching circuit comprises a follower U1, a fourth resistor R4 and a fifth resistor R5, wherein one input end of the follower U1 is connected to the output end of the current sensor circuit through the fourth resistor R4, the second input end of the follower U is connected to the output end, the output end of the follower U is connected with one end of the fifth resistor R5, the other end of the fifth resistor R5 is used as the output end of the welding current detection circuit, and the fourth resistor R4 is used for limiting current.
In one embodiment of the present application, the control processing circuit includes a microprocessor chip and its peripheral circuitry.
In the control processing circuit, the thickness of the welding material is segmented, and a corresponding arc striking current function is arranged on each segment.
In a specific embodiment of the application, the welding material thickness is used for segmentation, and the welding material thickness can be divided into N segments, wherein each segment is provided with a function relation between the arc striking current of each segment and the welding material thickness, so that the arc striking current is accurately set when the welding material thickness is different, and N is a positive integer greater than or equal to 2.
In a specific embodiment of the present application, as shown in fig. 4, two thickness setting values are set according to the thickness of the welding material, wherein the first thickness setting value X is smaller than the second thickness setting value Y, the thickness of the welding material is divided into three sections, when the thickness of the welding material is smaller than the first thickness setting value X in specific welding, the arc striking current is set to be a first current setting value, the value of the first current setting value is a, when the thickness of the welding material is greater than or equal to the second thickness setting value Y, the arc striking current is set to be a second current setting value, the value of the second current setting value is b, and correspondingly, the second current setting value is greater than the first current setting value.
When the thickness of the welding material is larger than or equal to a first thickness set value X and smaller than a second thickness set value Y, setting the arc striking current to form a linear relation with the thickness of the welding material, wherein the linear relation is expressed by the following formula:
arc striking current=k×welding current+a
Wherein 0< K <1.
Correspondingly, the first tungsten electrode diameter set value is corresponding to the first thickness set value X, and the second tungsten electrode diameter set value is corresponding to the first thickness set value Y. The thickness of the welding material is corresponding to the diameter of the tungsten electrode.
In a specific embodiment of the present application, if the thickness of the welding material is segmented, the welding material can be divided into more than three segments, and different linear relations between the arc striking current and the thickness of the welding material are set according to the arc striking current rule of each segment, that is, the constant term value is different, and the coefficient term value is different.
The control processing circuit compares the welding current A2 with the set current A1, when the welding current is equal to the set current, according to the thickness of the welding material, the control pulse is output, and meanwhile, the arc striking pulse corresponding to the thickness of the welding material is output, and after being converted by the inverter circuit and the transformer, the arc striking pulse is added to the output current, so that the arc striking preheating current and the arc striking current are improved.
In one embodiment of the application, a is between 60 and 80A and b is between 90 and 120A.
After the arc ignition is successful, the welding current is kept constant, and if the arc ignition is unsuccessful, the welding current is reduced until the welding current is 0.
The application relates to a self-adaptive arc striking current control circuit of an inverter welding power supply, which has the following working principle:
after the inverter welding power supply is switched on, the control processing circuit outputs a PWM1/PWM2 control signal according to the set current, the inverter circuit is controlled to work, the output end obtains the output current after the conversion of the transformer, when a welding gun contacts a welding material, current flows through the output end, when the current rises to be equal to the set current, the control processing circuit outputs corresponding different arc striking pulses to the welding material with different thickness according to the corresponding relation between the thickness of the welding material and the arc striking current, the arc striking pulses correspond to the corresponding arc striking currents, and under the combined action of the arc striking pulses and the PWM1/PWM2 control signal, the inverter welding power supply outputs the corresponding arc striking current, and the welding material is preheated and the arc striking is generated, so that the aim of successful arc striking is fulfilled.
An embodiment of the present application provides a terminal device of an adaptive arc striking current control processing circuit of an inverter welding power source, where the terminal device of the embodiment includes: a processor, a memory and a computer program stored in the memory and executable on the processor, such as an adaptive arc starting current control program, which processor implements the method of the application when executing the computer program.
The computer program may be divided into one or more modules/units, which are stored in the memory and executed by the processor to accomplish the present application, for example. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in an adaptive arc initiation current control processing circuit terminal device of the inverter welding power source.
The terminal device of the adaptive arc striking current control processing circuit of the inverter welding power supply can comprise, but is not limited to, a processor and a memory. It will be appreciated by those skilled in the art that the above examples are merely examples of the adaptive arc starting current control processing circuit terminal device of the inverter welding power source, and do not constitute a limitation of the adaptive arc starting current control processing circuit terminal device of the inverter welding power source, and may include more or less components than those illustrated, or may combine certain components, or different components, for example, the adaptive arc starting current control processing circuit terminal device of the inverter welding power source may further include an input-output device, a network access device, a bus, and the like.
The processor may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, data signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general processor may be a microprocessor or the processor may be any conventional processor or the like, and the processor is a control center of the adaptive arc striking current control processing circuit terminal device of the inverter welding power supply, and is connected with various parts of the adaptive arc striking current control processing circuit terminal device of the whole inverter welding power supply by various interfaces and lines.
The memory can be used for storing the computer program and/or the module, and the processor can realize various functions of the self-adaptive arc striking current control processing circuit terminal equipment of the inverter welding power supply by running or executing the computer program and/or the module stored in the memory and calling the data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure digital (SecureDigital, SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid state memory device.
The module/unit integrated by the terminal device of the adaptive arc striking current control processing circuit of the inverter welding power supply can be stored in a computer readable storage medium if the module/unit is realized in the form of a software functional unit and sold or used as a separate product. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a Read-only memory (ROM), a random access memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (10)

1. A self-adaptive arc striking current control method of an inverter welding power supply is characterized in that: the method comprises the steps of setting a set current, detecting welding current, setting the magnitude of arc striking current according to the function relation between the thickness of a welding material and the arc striking current when the welding current is equal to the set current, and outputting an arc striking pulse.
2. The adaptive arc striking current control method of an inverter welding power source of claim 1, wherein: segmenting according to the thickness of the welding material, and determining the magnitude of the arc striking current by adopting different functional relations between the thickness of the welding material and the arc striking current in different segments.
3. The adaptive arc striking current control method of an inverter welding power source of claim 2, wherein: setting the arc striking current as a first current set value when the thickness of the welding material is smaller than or equal to a first thickness value; setting the arc striking current as a second current set value when the thickness of the welding material is larger than a second thickness value; when the thickness of the welding material is larger than the first thickness value and smaller than or equal to the second thickness value, the arc striking current and the welding current are set to form a linear relation, the value of the arc striking current is located between the first current set value and the second current set value, and the second current set value is larger than the first current set value.
4. A method of adaptive arc ignition current control for an inverter welding power source as claimed in claim 3, wherein: when the thickness of the welding material is larger than the first thickness value and smaller than or equal to the second thickness value, the arc striking current is located between the first current set value and the second current set value, and the linear relation between the arc striking current and the welding current is shown as the following formula:
arc striking current = K x welding current + a;
wherein 0< K <1, a represents a first current set point.
5. An adaptive arc striking current control circuit of an inverter welding power supply is characterized in that: the welding current detecting circuit is connected to the output end of the second rectifying circuit and used for sampling welding current, the control processing circuit is connected with the inverter circuit, the current setting circuit and the welding current detecting circuit and used for outputting control pulses according to comparison of the welding current and the setting current, controlling the frequency of the inverter circuit, and when the welding current is equal to the setting current, the control processing circuit increases arc striking pulses on the control pulses, improves welding current output and achieves arc striking.
6. The adaptive arc ignition current control circuit of an inverter welding power source of claim 5, wherein: the current setting circuit comprises a series resistor combination, one end of the series resistor combination is connected with a first power supply voltage, the other end of the series resistor combination is grounded, the series resistor combination comprises an adjustable resistor, and the adjustable end of the adjustable resistor is used as an output end of the current setting circuit and is connected to the control circuit.
7. The adaptive arc ignition current control circuit of an inverter welding power source of claim 5, wherein: the welding current detection circuit comprises a current sensor, a filter circuit and a reactance matching circuit which are sequentially connected, wherein the current sensor detects welding current, and the filter circuit filters the detected welding current and transmits the welding current to the control circuit through the reactance matching circuit.
8. The adaptive arc ignition current control circuit of an inverter welding power source of claim 7, wherein: the reactance matching circuit includes a follower for impedance matching.
9. The adaptive arc ignition current control circuit of an inverter welding power source of claim 5, wherein: the control processing circuit compares the detected welding current with a set current, and when the welding current is equal to the set current, the control pulse is output and the arc striking pulse corresponding to the thickness of the welding material is output according to the thickness of the welding material, so that the arc striking preheating current is improved.
10. An adaptive arc striking current control processing circuit terminal of an inverter welding power supply, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: the processor, when executing the computer program, implements the method according to any of claims 1-4.
CN202311001895.6A 2023-08-09 2023-08-09 Self-adaptive arc striking current control method and circuit for inverter welding power supply Pending CN117001111A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311001895.6A CN117001111A (en) 2023-08-09 2023-08-09 Self-adaptive arc striking current control method and circuit for inverter welding power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311001895.6A CN117001111A (en) 2023-08-09 2023-08-09 Self-adaptive arc striking current control method and circuit for inverter welding power supply

Publications (1)

Publication Number Publication Date
CN117001111A true CN117001111A (en) 2023-11-07

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CN202311001895.6A Pending CN117001111A (en) 2023-08-09 2023-08-09 Self-adaptive arc striking current control method and circuit for inverter welding power supply

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