Variable wave arc welding power source control method, arc welding equipment, control device and storage medium

Abstract

This invention discloses a variable-wave arc welding power supply control method, arc welding equipment, control device, and storage medium. Applied to an arc welding equipment, the equipment includes a coordination control module and at least two power conversion modules. The coordination control module is connected to the controlled terminals of each power conversion module to control the switching of the power conversion modules to form and output pulse power. The output terminals of each power conversion module are connected in parallel to superimpose the electrical energy of the arc welding power supply. The variable-wave arc welding power supply control method includes: the coordination control module outputting its corresponding control commands to each power conversion module; and each power conversion module adjusting the pulse width and on / off timing of the pulse power according to the control commands to increase the power or voltage amplitude of the arc welding power supply. This design optimizes the output waveform of the welding power supply, enabling it to provide excellent dynamic characteristics and improve welding performance.

Description

Technical Field

[0001] This invention relates to the field of arc welding power supply control technology, and in particular to a variable waveform arc welding power supply control method, arc welding equipment, control device, and storage medium. Background Technology

[0002] Existing arc welding equipment typically includes a power conversion module, which comprises a first rectifier unit, a power conversion unit, a transformer unit, a second rectifier unit, and a reactor unit connected in sequence. The control module of the arc welding equipment is connected to the controlled terminal of the power conversion unit. The power conversion unit is usually composed of multiple semiconductor switching transistors. The control module controls the on / off state of each switching transistor to adjust the duty cycle (pulse width) and thus control the output arc welding power supply. During the welding process, the frequency of the arc welding power supply pulse affects the arc welding effect. However, due to the limitations of the semiconductor switching transistors themselves, the input terminal of the first rectifier unit is connected to the mains frequency AC power supply, which limits the output power of the arc welding equipment, resulting in no breakthrough improvement in the arc welding power supply of current arc welding equipment. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a variable waveform arc welding power supply control method, arc welding equipment, control device, and storage medium, which optimizes the output waveform of the welding power supply, enabling the welding power supply to provide excellent dynamic characteristics and improve welding results.

[0004] According to a first aspect of the present invention, a variable-wave arc welding power supply control method is applied to an arc welding equipment. The arc welding equipment includes a coordination control module and at least two power conversion modules. The coordination control module is connected to the controlled terminal of each of the power conversion modules to control the on / off state of the power conversion modules to form and output pulse power. The output terminals of each of the power conversion modules are connected in parallel to superimpose the electrical energy of the arc welding power supply. The variable-wave arc welding power supply control method includes: the coordination control module outputting its corresponding control commands to each of the power conversion modules; and each power conversion module adjusting the pulse width and on / off time of the pulse power according to the control commands to increase the power or voltage amplitude of the arc welding power supply.

[0005] The variable waveform arc welding power supply control method according to embodiments of the present invention has at least the following beneficial effects:

[0006] This invention discloses a variable waveform arc welding power supply control method. It utilizes a parallel structure of multiple power conversion modules' output terminals to superimpose the pulse power output of each module to form the electrical energy of the arc welding power supply. Since each power conversion module can adjust the pulse width and on / off timing, when the pulse power outputs of each module are superimposed, some pulses may overlap, while others may not. Therefore, the number of electrical edge signals within the same cycle can be increased, thereby increasing the arc welding power supply power by raising the frequency or changing the voltage amplitude. This design optimizes the output waveform of the welding power supply, providing excellent dynamic characteristics and improving welding performance.

[0007] According to some embodiments of the present invention, at least two power conversion modules include a first power conversion module and a second power conversion module. Each power conversion module adjusts the pulse width and on / off time of the pulse power according to control commands, including a first working mode. The first working mode includes: the pulses of the pulse power output by the first power conversion module and the pulse power output by the second power conversion module do not overlap in intervals to improve the power of the arc welding power source.

[0008] According to some embodiments of the present invention, the adjustment of the pulse width and on / off time of the pulse power by each power conversion module according to the control command further includes a second working mode. The second working mode includes: the pulses of the pulse power output by the first power conversion module and the pulse power output by the second power conversion module have at least partially overlapping intervals and at least partially non-overlapping intervals to increase the power of the arc welding power source, and increasing the voltage amplitude of the arc welding power source in the overlapping intervals of the pulses of the pulse power output by the first power conversion module and the pulse power output by the second power conversion module.

[0009] According to some embodiments of the present invention, the adjustment of the pulse width and on / off time of the pulse power by each power conversion module according to the control command further includes a third working mode, wherein the pulse of the pulse power output by the first power conversion module and the pulse of the pulse power output by the second power conversion module completely overlap to increase the voltage amplitude of the arc welding power supply.

[0010] According to some embodiments of the present invention, the variable waveform arc welding power supply control method further includes: acquiring control commands; coordinating the control module to formulate control commands for each power conversion module according to the control commands; and coordinating the control module to issue control commands to each corresponding power conversion module so that the arc welding equipment switches between at least a first working mode, a second working mode, and a third working mode.

[0011] According to a second aspect of the present invention, an arc welding device includes a coordination control module and at least two power conversion modules. The coordination control module is connected to the controlled terminal of each of the power conversion modules to control the switching of the power conversion modules to form and output pulse power. The output terminals of each of the power conversion modules are connected in parallel. The arc welding device executes the variable wave arc welding power supply control method disclosed in any of the above embodiments to output the electrical energy of the arc welding power supply.

[0012] The arc welding equipment according to embodiments of the present invention has at least the following beneficial effects:

[0013] The arc welding equipment of the present invention executes the variable waveform arc welding power supply control method disclosed in any of the above embodiments to output the electrical energy of the arc welding power supply. This design optimizes the output waveform of the welding power supply, so that the welding power supply provides excellent dynamic characteristics and improves the welding effect.

[0014] According to some embodiments of the present invention, the arc welding equipment further includes a reactor module. The power conversion module includes a first rectifier unit, a power conversion unit, a transformer unit, and a second rectifier unit. The input terminal of the first rectifier unit is connected to an industrial frequency AC power supply. The output terminal of the first rectifier unit is connected to the input terminal of the power conversion unit. The output terminal of the power conversion unit is connected to the primary winding of the transformer unit. The secondary winding of the transformer unit is connected to the input terminal of the second rectifier unit. The output terminals of the second rectifier units of each power conversion module are connected to the beginning of the reactor module, and the end of the reactor module outputs the electrical energy of the arc welding power supply. Alternatively, the reactor module includes multiple reactor units corresponding one-to-one with the power conversion module. The output terminal of the second rectifier unit is connected to the beginning of the corresponding reactor unit. The end terminals of the reactor units of each power conversion module are interconnected and output the electrical energy of the arc welding power supply.

[0015] According to some embodiments of the present invention, the power conversion module further includes a power control unit, which is connected to the controlled terminal of the power conversion unit of the power conversion module, and the coordination control module is connected to each power control unit respectively.

[0016] According to a third aspect of the present invention, the control device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the variable wave arc welding power supply control method disclosed in any of the above embodiments.

[0017] According to a fourth aspect of the present invention, a computer-readable storage medium stores a computer program that, when executed by a processor, implements the variable wave arc welding power supply control method disclosed in any of the above embodiments.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a circuit diagram of one embodiment of the arc welding equipment of the present invention;

[0021] Figure 2 This is a schematic diagram of the principle structure of one embodiment of the arc welding equipment of the present invention;

[0022] Figure 3 This is a waveform diagram of the arc welding power supply output by the first embodiment of the variable waveform arc welding power supply control method of the present invention;

[0023] Figure 4 This is a waveform diagram of the arc welding power supply output by the second embodiment of the variable waveform arc welding power supply control method of the present invention;

[0024] Figure 5 This is a waveform diagram of the arc welding power output from the third embodiment of the variable waveform arc welding power control method of the present invention;

[0025] Figure 6 This is a waveform diagram of the arc welding power output from the fourth embodiment of the variable waveform arc welding power control method of the present invention;

[0026] Figure 7 This is a schematic diagram of the control device of the present invention in one embodiment.

[0027] Figure label:

[0028] Coordination control module 100; first power conversion module 200; first rectifier unit 210; power conversion unit 220; transformer unit 230; second rectifier unit 240; reactor unit 250; power control unit 260; second power conversion module 300; processor 410; memory 420; input / output interface 430; communication interface 440; bus 450; welding wire 510; workpiece 520; electric arc 530. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0030] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0032] like Figures 1 to 6 As shown, the variable wave arc welding power supply control method according to the first aspect of the present invention is applied to an arc welding equipment. The arc welding equipment includes a coordination control module 100 and at least two power conversion modules. The coordination control module 100 is connected to the controlled terminal of each of the power conversion modules to control the switching of the power conversion modules to form and output pulse power. The output terminals of each of the power conversion modules are connected in parallel to superimpose the electrical energy of the arc welding power supply.

[0033] Among them, such as Figure 1 , 2 As shown, at least two power conversion modules include a first power conversion module 200 and a second power conversion module 300. Taking the first power conversion module 200 as an example, the structure of the second power conversion module 300 can be basically the same as that of the first power conversion module 200. The first power conversion module 200 typically includes a first rectifier unit 210, a power conversion unit 220, a transformer unit 230, and a second rectifier unit 240. The input terminal of the first rectifier unit 210 is used to connect to the power frequency AC power supply. The output terminal of the first rectifier unit 210 is connected to the input terminal of the power conversion unit 220. The output terminal of the power conversion unit 220 is connected to the primary winding of the transformer unit 230. The secondary winding of the transformer unit 230 is connected to the input terminal of the second rectifier unit 240. The output terminal (i.e., point P3) of the second rectifier unit 240 of each power conversion module is connected to the first end of the reactor module. The tail end of the reactor module outputs the electrical energy of the arc welding power supply.

[0034] Alternatively, the reactor module includes multiple reactor units 250 corresponding one-to-one with the power conversion module, the output terminal of the second rectifier unit 240 is connected to the first end of the corresponding reactor unit, and the tail ends of the reactor units 250 of each power conversion module are interconnected and output the electrical energy of the arc welding power supply.

[0035] The first rectifier unit 210 may include a full-wave rectifier bridge, the input of which is connected to a three-phase 380VAC power supply. The power conversion unit 220 includes an H-type inverter circuit composed of four semiconductor switching transistors, such as MOSFETs, IGBTs, and SiC. The inputs of switching transistors Q1 and Q3 are connected to the positive terminal of the output of the first rectifier unit 210, and the outputs of switching transistors Q1 and Q3 are connected to the negative terminal of the output of the first rectifier unit 210. The transformer unit 230 includes a primary winding and a secondary winding coupled to each other. The output of switching transistor Q1 is connected to the beginning of the primary winding and the input of switching transistor Q2, respectively. The output of switching transistor Q3 is connected to the end of the primary winding and the input of switching transistor Q4, respectively. The second rectifier unit 240 includes diodes D1 and D2. The beginning of the secondary winding is connected to the positive terminal of diode D1, and the end of the secondary winding is connected to the positive terminal of diode D2. The reactance unit 250 can be composed of at least one inductor. The negative terminal of diode D1 is connected to the negative terminal of diode D2 and the beginning of the reactance unit 250, respectively. The end of the reactance unit 250 and the center tap of the secondary winding serve as the output terminal of the power conversion module to output pulse power.

[0036] The tail end of the reactance unit 250 of each power conversion module is connected to the welding wire 510 of the welding gun of the arc welding equipment (i.e., point P2), while the center tap of the secondary winding of each power conversion module is connected to the workpiece 520 (i.e., point P1), and an electric arc 530 is generated between the welding wire and the workpiece.

[0037] The coordination control module 100 may include a processor such as an MCU or CPU and its auxiliary circuits. Each power conversion module may also include a power control unit 260, which is connected to the controlled end of the inverter module of its own power conversion module. The power control unit 260 may be various control chips capable of outputting PWM signals and its auxiliary circuits.

[0038] The variable waveform arc welding power supply control method includes:

[0039] The coordination control module 100 outputs its corresponding control commands to each of the power conversion modules. Each power conversion module adjusts the pulse width and on / off time of the pulse power according to the control commands to increase the power or voltage amplitude of the arc welding power source.

[0040] Specifically, such as Figures 3 to 7 As shown, the waveform of the arc welding power supply changes accordingly under different operating modes. Figures 3 to 7The diagram shows the signal waveforms of the primary winding A1 and secondary winding A2 of the transformer unit 230 in the first power conversion module 200 connected to the output terminal (i.e., point P3) of the second rectifier unit 240, the primary winding B1 and secondary winding B2 of the transformer unit 230 in the second power conversion module 300 connected to the output terminal (i.e., point P3) of the second rectifier unit 240, and the superimposed waveform out.

[0041] Understandably, the coordination control module 100 can give different control commands to each power conversion module, so that the pulse power output by each power conversion module can be different or equal. When a large current is required, two or more power conversion modules can work together. When only a small current is required, one power conversion module can be controlled to run while the other power conversion modules stop, so as to reduce the loss during the power conversion module's turn-on and turn-off process.

[0042] Furthermore, the inductance of the reactance unit 250 in each power conversion module can be equal or unequal. During the welding process, the power conversion modules are continuously switched according to the welding process requirements and the droplet transfer status. Since the inductance of the reactance unit 250 connected to each power conversion module is different, the inductance of the arc welding equipment output circuit changes during the welding process, giving the arc welding equipment excellent dynamic characteristics that are very suitable for the welding process.

[0043] During welding, the output of arc welding equipment may frequently short-circuit, causing the output circuit resistance to decrease rapidly. To control the welding current, the on / off duty cycle must be significantly reduced; however, a duty cycle that is too small will cause instability in the power conversion module. Arc welding equipment can achieve control over its output waveform, dynamic characteristics, external characteristics, and adjustment characteristics by switching power conversion modules and changing the type and frequency of the emitted signal, ultimately obtaining better welding process performance.

[0044] This invention discloses a variable waveform arc welding power supply control method. It utilizes a parallel structure of multiple power conversion modules' output terminals to superimpose the pulse power output of each module to form the electrical energy of the arc welding power supply. Since each power conversion module can adjust the pulse width and on / off timing, when the pulse power outputs of each module are superimposed, some pulses may overlap, while others may not. Therefore, the number of electrical edge signals within the same cycle can be increased, thereby increasing the arc welding power supply power by raising the frequency or changing the voltage amplitude. This design optimizes the output waveform of the welding power supply, providing excellent dynamic characteristics and improving welding performance.

[0045] In some embodiments of the present invention, the pulse width and on / off timing of the pulse power adjustment by each power conversion module according to control commands include a first operating mode, such as... Figure 3 As shown, the first working mode includes:

[0046] The pulse power output by the first power conversion module 200 and the pulse power output by the second power conversion module 300 do not have overlapping intervals, so as to improve the power of the arc welding power source.

[0047] At time t1, the power conversion unit 220 of the first power conversion module 200 is forward-biased with a pulse width of 5μs. At time t2, the power conversion unit 220 of the first power conversion module 200 is turned off. 12.5μs after time t1, at time t3, the power conversion unit 220 of the second power conversion module 300 is forward-biased with a pulse width of 5μs. At time t4, the power conversion unit 220 of the second power conversion module 300 is turned off. The power conversion unit 220 of the first power conversion module 200 is reverse-biased at time t5 and turned off at time t6. The power conversion unit 220 of the second power conversion module 300 is reverse-biased at time t7 and turned off at time t8, and so on.

[0048] As can be seen from the above time points, there is no overlap between the pulse power output by the first power conversion module 200 and the pulse power output by the second power conversion module 300. The power of the arc welding power supply increases exponentially, and the number of electrical edge signals increases exponentially, thereby optimizing the welding effect.

[0049] In some embodiments of the present invention, the pulse width and on / off timing of the pulse power adjustment of each power conversion module according to the control command also include a second working mode.

[0050] like Figure 4 , 5 As shown, the second operating mode includes:

[0051] The pulse power output by the first power conversion module 200 and the pulse power output by the second power conversion module 300 have at least partially overlapping intervals and at least partially non-overlapping intervals to increase the power of the arc welding power source, and increase the voltage amplitude of the arc welding power source in the overlapping intervals of the pulse power output by the first power conversion module 200 and the pulse power output by the second power conversion module 300.

[0052] exist Figure 4At time t1, the power conversion unit 220 of the first power conversion module 200 is forward-biased, and the total voltage output of the arc welding power supply is the base voltage with a pulse width of 15μs. 12.5μs after time t1, at time t2, the power conversion unit 220 of the second power conversion module 300 is forward-biased simultaneously with a pulse width of 15μs. At this time, the total voltage output of the arc welding power supply is the peak voltage of the simultaneous conduction of the power conversion units 220 of the first power conversion module 200 and the power conversion units 220 of the second power conversion module 300. At time t3, the power conversion unit 220 of the first power conversion module 200 is turned off, and the total voltage output is the base voltage. At time t4, the power conversion unit 220 of the first power conversion module 200 is reverse-biased, and the total voltage output of the arc welding power supply is the peak voltage of the simultaneous conduction of the power conversion units 220 of the first power conversion module 200 and the power conversion units 220 of the second power conversion module 300. At time t5, inverter B is turned off, and the total voltage output of the arc welding power supply is the base voltage. At time t6, the power conversion unit 220 of the second power conversion module 300 is forward-biased, and the total voltage output of the arc welding power supply is the peak voltage of the simultaneous conduction of the power conversion units 220 of the first and second power conversion modules 300. At time t7, the power conversion unit 220 of the first power conversion module 200 is turned off, and the total voltage output of the arc welding power supply is the base voltage, and so on.

[0053] exist Figure 5In the process, when the PWM control signal waveform changes from a minimum pulse width of 5μs to a maximum pulse width of 23μs (inverter dead time 2μs), at time t1, the power conversion unit 220 of the first power conversion module 200 is forward-biased, and the total voltage output of the arc welding power supply is the base voltage with a pulse width of 23μs. 12.5μs after time t1, at time t2, the power conversion unit 220 of the second power conversion module 300 is forward-biased simultaneously with a pulse width of 23μs. At this time, the total voltage output of the arc welding power supply is the peak voltage of the simultaneous conduction of the power conversion units 220 of the first and second power conversion modules 200. At time t3, the power conversion unit 220 of the first power conversion module 200 is turned off, and the total voltage output of the arc welding power supply is the base voltage. At time t4, the first power conversion unit 220 is forward-biased. When the power conversion unit 220 of the switching module 200 is reverse-biased, the total voltage output of the arc welding power supply is the peak voltage of the power conversion units 220 of the first power conversion module 200 and 220 of the second power conversion module 300 simultaneously conducting. At time t5, the power conversion unit 220 of the second power conversion module 300 is turned off, and the total voltage output of the arc welding power supply is the base voltage. At time t6, the power conversion unit 220 of the second power conversion module 300 is forward-biased, and the total voltage output of the arc welding power supply is the peak voltage of the power conversion units 220 of the first power conversion module 200 and 220 of the second power conversion module 300 simultaneously conducting. At time t7, the power conversion unit 220 of the first power conversion module 200 is turned off, and the total voltage output of the arc welding power supply is the base voltage, and so on. Within one cycle (50μs) of the PWM control signal, the pulse waveform appears 4 times. That is, when the pulse width of the drive signal of the power conversion unit 220 is greater than the phase reversal time, the total voltage output of the arc welding power supply is a pulse waveform and the power is 80kHz. The maximum duty cycle obtained from the maximum pulse width is 92%.

[0054] As can be seen from the above time points, the overlapping intervals between the pulse power output of the first power conversion module 200 and the pulse power output of the second power conversion module 300 increase the voltage amplitude of the arc welding power source, while the partially non-overlapping intervals increase the power of the arc welding power source. The power of the arc welding power source increases exponentially, and the number of electrical edge signals increases exponentially, thereby optimizing the welding effect.

[0055] In some embodiments of the present invention, the pulse width and on / off timing of the pulse power adjustment of each power conversion module according to the control command also include a third working mode.

[0056] like Figure 6 As shown, the third working mode includes: the pulses of the pulse power output by the first power conversion module 200 and the pulse power output by the second power conversion module 300 completely overlap to increase the voltage amplitude of the arc welding power supply.

[0057] By changing the PWM control signal of the power conversion unit 220 of the power conversion module, the outputs of multiple power conversion units 220 can be out of phase by half a cycle. The power conversion unit 220 of the first power conversion module 200 is forward-biased at time t1 and turns off at time t2; at time t3, the power conversion unit 220 of the first power conversion module 200 turns off in reverse, while the power conversion unit 220 of the second power conversion module 300 turns on forward; at time t4, both the power conversion units 220 of the first and second power conversion modules 300 turn off simultaneously; at time t5, the power conversion unit 220 of the first power conversion module 200... At time t6, the power conversion units 220 of the first power conversion module 200 and the second power conversion module 300 are simultaneously turned off. At time t7, the power conversion units 220 of the first power conversion module 200 are reverse-biased, and the power conversion units 220 of the second power conversion module 300 are forward-biased. At time t8, the power conversion units 220 of both the first and second power conversion modules 200 are simultaneously turned off. The power conversion unit 220 of the first power conversion module 200 achieves both forward and reverse conduction within 0–50 μs. Within 25 μs–75 μs, the power conversion unit 220 of the second power conversion module 300 achieves both forward and reverse conduction.

[0058] As can be seen from the above time points, the pulse of the pulse power output by the first power conversion module 200 and the pulse of the pulse power output by the second power conversion module 300 completely overlap. At this time, the power of the arc welding power supply remains unchanged, and the electrical signal does not increase, but the voltage amplitude of the arc welding power supply can be increased.

[0059] In some embodiments of the present invention, the variable waveform arc welding power supply control method further includes:

[0060] The control module 100 obtains control commands and formulates control commands for each power conversion module based on the control commands.

[0061] The coordination control module 100 sends control commands to each corresponding power conversion module so that the arc welding equipment can switch between at least the first working mode, the second working mode and the third working mode.

[0062] The operator can input control commands according to the requirements of the welding process. The coordination control module 100 formulates control commands for each power conversion module according to the control commands, thereby realizing the switching between the first working mode, the second working mode and the third working mode. In different working modes, the on and off times of the power conversion units 220 of each power conversion module can also be formulated according to the requirements.

[0063] According to a second aspect of the present invention, an arc welding device includes a coordination control module 100 and at least two power conversion modules. The coordination control module 100 is connected to the controlled terminal of each of the power conversion modules to control the switching of the power conversion modules to form and output pulse power. The output terminals of each of the power conversion modules are connected in parallel. The arc welding device executes the variable wave arc welding power supply control method disclosed in any of the above embodiments to output the electrical energy of the arc welding power supply.

[0064] The arc welding equipment of the present invention executes the variable waveform arc welding power supply control method disclosed in any of the above embodiments to output arc welding power. This design optimizes the output waveform of the welding power supply, so that the welding power supply provides excellent dynamic characteristics and improves the welding effect.

[0065] In some embodiments of the present invention, the arc welding equipment further includes a reactor module, and the power conversion module includes a first rectifier unit 210, a power conversion unit 220, a transformer unit 230, and a second rectifier unit 240. The input terminal of the first rectifier unit 210 is used to connect to the power frequency AC power supply, the output terminal of the first rectifier unit 210 is connected to the input terminal of the power conversion unit 220, the output terminal of the power conversion unit 220 is connected to the primary winding of the transformer unit 230, and the secondary winding of the transformer unit 230 is connected to the input terminal of the second rectifier unit 240.

[0066] The output terminal of the second rectifier unit 240 of each power conversion module is connected to the first end of the reactor module, and the tail end of the reactor module outputs the electrical energy of the arc welding power supply.

[0067] Alternatively, the reactor module includes multiple reactor units 250 corresponding one-to-one with the power conversion module, the output terminal of the second rectifier unit 240 is connected to the first end of the corresponding reactor unit, and the tail ends of the reactor units 250 of each power conversion module are interconnected and output the electrical energy of the arc welding power supply.

[0068] In some embodiments of the present invention, the power conversion module further includes a power control unit 260, which is connected to the controlled end of the power conversion unit 220 of the power conversion module, and the coordination control module 100 is connected to each power control unit 260 respectively.

[0069] The coordination control module 100 is connected to the control module to formulate control instructions for each power conversion module according to the control instructions. The control of each power conversion module requires the acquisition of various parameters such as input voltage, input current, output voltage, and output current. At the same time, it also needs to control the power conversion unit 220. Therefore, in order to reduce the processing load, a power control unit 260 is added for each power conversion module. The power control unit 260 acquires various parameters such as input voltage, input current, output voltage, and output current, and controls the power conversion unit 220 according to the control instructions issued by the coordination control module 100. Multi-core processing reduces the operating load of a single processor and ensures more stable and accurate processing.

[0070] According to a third aspect of the present invention, the control device includes a memory 420 and a processor 410. The memory 420 stores a computer program, and the processor 410 executes the computer program to implement the variable wave arc welding power supply control method disclosed in any of the above embodiments.

[0071] like Figure 7 As shown, Figure 7 The hardware structure of a control device according to another embodiment is also illustrated. The control device includes:

[0072] The processor 410 can be implemented using a general-purpose central processing unit (CPU), a microprocessor 410, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application.

[0073] The memory 420 can be implemented as a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 420 can store the operating system and other applications. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 420 and is called and executed by the processor 410 to execute the variable wave arc welding power supply control method of the embodiments of this application.

[0074] Input / output interface 430 is used to realize information input and output;

[0075] The communication interface 440 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0076] Bus 450 transmits information between various components of the device (e.g., processor 410, memory 420, input / output interface 430, and communication interface 440);

[0077] The processor 410, memory 420, input / output interface 430 and communication interface 440 are connected to each other within the device via bus 450.

[0078] According to a fourth aspect of the present invention, a computer-readable storage medium stores a computer program that, when executed by a processor 410, implements the variable wave arc welding power supply control method disclosed in any of the above embodiments.

[0079] Memory 420, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory 420 may optionally include memory remotely located relative to the processor, and this remote memory can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0080] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0081] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0082] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0083] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0084] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0085] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A method for controlling a variable-wave arc welding power supply, applied to an arc welding equipment, wherein the arc welding equipment includes a coordination control module and at least two power conversion modules, the coordination control module is connected to the controlled terminal of each of the power conversion modules to control the on / off state of the power conversion modules to form and output pulse power, and the output terminals of each of the power conversion modules are connected in parallel to superimpose the electrical energy of the arc welding power supply, characterized in that, The variable waveform arc welding power supply control method includes: The coordination control module outputs its corresponding control commands to each of the power conversion modules. Each power conversion module adjusts the pulse width and on / off time of the pulse power according to the control commands to increase the power or voltage amplitude of the arc welding power source. At least two of the power conversion modules include a first power conversion module and a second power conversion module. Each power conversion module adjusts the pulse width and on / off time of the pulse power according to control commands, including a first operating mode. The first operating mode includes: The pulse power output by the first power conversion module and the pulse power output by the second power conversion module do not overlap in their intervals, so as to improve the power of the arc welding power source. The adjustment of pulse width and on / off timing of pulse power by each power conversion module according to control commands also includes a second operating mode, which includes: The pulse power output by the first power conversion module and the pulse power output by the second power conversion module have at least partially overlapping intervals and at least partially non-overlapping intervals to increase the power of the arc welding power source, and increase the voltage amplitude of the arc welding power source in the overlapping intervals of the pulse power output by the first power conversion module and the pulse power output by the second power conversion module.

2. The variable waveform arc welding power supply control method according to claim 1, characterized in that, The adjustment of pulse width and on / off timing of pulse power by each power conversion module according to control commands also includes a third operating mode, which includes: The pulses of the pulse power output by the first power conversion module and the pulse power output by the second power conversion module completely overlap to increase the voltage amplitude of the arc welding power supply.

3. The variable waveform arc welding power supply control method according to claim 2, characterized in that, Also includes: The control module acquires control commands and coordinates the control commands to formulate control commands for each power conversion module based on the control commands. The coordination control module sends control commands to each corresponding power conversion module so that the arc welding equipment can switch between at least the first working mode, the second working mode and the third working mode.

4. An arc welding device, characterized in that, The device includes a coordination control module and at least two power conversion modules. The coordination control module is connected to the controlled terminal of each power conversion module to control the switching of the power conversion modules to form and output pulse power. The output terminals of each power conversion module are connected in parallel. The arc welding equipment executes the variable wave arc welding power supply control method as described in any one of claims 1 to 3 to output the electrical energy of the arc welding power supply.

5. The arc welding equipment according to claim 4, characterized in that, The arc welding equipment also includes a reactor module. The power conversion module includes a first rectifier unit, a power conversion unit, a transformer unit, and a second rectifier unit. The input terminal of the first rectifier unit is used to connect to the power frequency AC power supply. The output terminal of the first rectifier unit is connected to the input terminal of the power conversion unit. The output terminal of the power conversion unit is connected to the primary winding of the transformer unit. The secondary winding of the transformer unit is connected to the input terminal of the second rectifier unit. The output terminal of the second rectifier unit of each power conversion module is connected to the first end of the reactor module, and the tail end of the reactor module outputs the electrical energy of the arc welding power supply. Alternatively, the reactor module includes multiple reactor units that correspond one-to-one with the power conversion module. The output terminal of the second rectifier unit is connected to the first end of the corresponding reactor unit, and the tail ends of the reactor units of each power conversion module are connected to each other and output the electrical energy of the arc welding power supply.

6. The arc welding equipment according to claim 5, characterized in that, The power conversion module further includes a power control unit, which is connected to the controlled end of the power conversion unit of the power conversion module, and the coordination control module is connected to each power control unit respectively.

7. A control device, characterized in that, The control device includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the variable wave arc welding power supply control method according to any one of claims 1 to 3.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the variable wave arc welding power supply control method according to any one of claims 1 to 3.

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