An ac coordinated control system and an operating method of an ac coordinated controller

Abstract

An AC coordinated control system includes a first coordinated controller and at least two welding power sources, the first coordinated controller including a parameter setting unit configured to set parameters required for welding, a communication unit in communication with each of the at least two welding power sources and configured to transmit the parameters to each of the at least two welding power sources, an output unit connected to the at least two welding power sources and configured to output a phase of the first coordinated controller to the at least two welding power sources, and a control unit connected to the parameter setting unit, the communication unit, and the output unit and configured to control actions of the parameter setting unit, the communication unit, and the output unit, wherein the at least two welding power sources are configured to output welding currents synchronized with the phase of the first coordinated controller in response to receiving the parameters transmitted by the output unit and the phase of the first coordinated controller. An operation method of an AC coordinated controller is also provided.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of electric welding machines, and more specifically, to an AC coordinated control system and an operating method of an AC coordinated controller. Background Technology

[0002] With the increasingly widespread application of aluminum and aluminum alloys in modern industrial production, especially in the automotive, aerospace, and shipbuilding industries, aluminum welding is also increasing. AC TIG aluminum welding, as a type of aluminum welding, plays a crucial role in aluminum welding.

[0003] During AC TIG welding, the direction of the current changes periodically, and the frequency and positive / negative ratio of the change are determined by the AC frequency and cleaning width set by the power supply.

[0004] When multiple AC TIG welders simultaneously on the same workpiece, the asynchronous phase of the welding power supply outputs causes the output of one welding power supply to be connected in series through the circuits of the other welding power supplies during the welding process. This results in an increase in the number of reactors connected in series in the circuit during welding output, increasing the inductance. When the IGBTs in the circuit need to be turned off for commutation, the reverse voltage across the IGBT at the moment of turn-off is proportional to the inductance in the circuit. Therefore, the reverse voltage increases at the instant the IGBT is turned off, potentially triggering a welding power supply alarm. Summary of the Invention

[0005] In view of this, embodiments of the present disclosure provide an AC coordination control system that enables multiple AC welding power supplies simultaneously welding the same workpiece to maintain phase consistency, thereby solving the problem of increased reverse voltage or even welding power supply alarms at the moment of IGBT turn-off when multiple AC welding power supplies for welding the same workpiece are out of sync.

[0006] At least one embodiment of this disclosure provides an AC coordinated control system, including a first coordinated controller and at least two welding power sources. The first coordinated controller includes a parameter setting unit, a communication unit, an output unit, and a control unit.

[0007] The control unit is connected to the parameter setting unit, the communication unit, and the output unit, and is configured to control the operation of the parameter setting unit, the communication unit, and the output unit;

[0008] The parameter setting unit is configured to set the parameters required for welding;

[0009] The communication unit communicates with each of the at least two welding power sources and is configured to send the parameters to each of the at least two welding power sources;

[0010] The output unit is connected to the at least two welding power sources and configured to output the phase of the first coordination controller to the at least two welding power sources; and

[0011] The at least two welding power sources are configured to output a welding current synchronized with the phase of the first coordination controller in response to receiving the parameters sent by the output unit and the phase of the first coordination controller.

[0012] In one embodiment of this disclosure, the first coordination controller further includes an input unit configured to determine whether the first coordination controller is connected to other coordination controllers and to receive phases output by other coordination controllers through an output unit.

[0013] In one embodiment of this disclosure, the input unit is connected to the control unit. When the input unit determines that the first coordination controller is connected to other coordination controllers, the control unit determines that the first coordination controller is a slave device. When the input unit determines that the first coordination controller is not connected to other coordination controllers, the control unit determines that the first coordination controller is a master device.

[0014] In one embodiment of this disclosure, the output unit of the first coordination controller has at least two output ports.

[0015] In one embodiment of this disclosure, the parameters include frequency and cleaning width.

[0016] In one embodiment of this disclosure, the communication unit communicates based on a bus mode.

[0017] In one embodiment of this disclosure, the communication unit communicates based on a serial bus.

[0018] In one embodiment of this disclosure, the communication unit communicates based on a CAN bus.

[0019] In one embodiment of this disclosure, the communication coordination control system further includes a second coordination controller and a third coordination controller, wherein the first coordination controller is connected to the communication unit of the second coordination controller and the communication unit of the third coordination controller via its communication unit, and is also connected to the input unit of the second coordination controller and the input unit of the third coordination controller via its output unit.

[0020] In one embodiment of this disclosure, the AC coordination control system further includes a fourth coordination controller, wherein the first coordination controller is connected to the communication unit of the fourth coordination controller via its communication unit, and the third coordination controller is connected to the input unit of the fourth coordination controller via its output unit.

[0021] In one embodiment of this disclosure, the communication coordination control system further includes: a second coordination controller and a third coordination controller, wherein the first coordination controller is connected to the communication unit of the second coordination controller and the communication unit of the third coordination controller through its communication unit, and is connected to the input unit of the second coordination controller through its output unit, and the second coordination controller is connected to the input unit of the third coordination controller through its output unit.

[0022] At least one embodiment of this disclosure also provides a method for operating an AC coordination controller, comprising:

[0023] Determine the operating mode of the communication coordination controller; and

[0024] The actions of the communication coordination controller are executed according to the operating mode.

[0025] In one embodiment of this disclosure, determining the operating mode of the AC coordination controller includes:

[0026] Determine whether the input unit of the AC coordination controller is connected to other coordination controllers;

[0027] When no other coordinating controller is connected to the input unit, it is determined that the coordinating controller is in master device operation mode; and

[0028] When the input unit is connected to another coordinating controller, it is determined that the coordinating controller is in slave device operation mode.

[0029] In one embodiment of this disclosure, when it is determined that the coordination controller is in master device operation mode, performing the actions of the AC coordination controller according to the operation mode includes:

[0030] The parameters required for welding can be set or changed through the parameter setting unit;

[0031] After setting or changing the parameters, a delay is established, and the parameters are then sent to other devices via the communication unit; and

[0032] According to the parameters set by the parameter setting unit, the corresponding frequency and cleaning width phase information are output through the output unit.

[0033] In one embodiment of this disclosure, the other device is a welding power source or other coordination controller.

[0034] In one embodiment of this disclosure, when it is determined that the coordination controller is in slave device operation mode, performing the actions of the AC coordination controller according to the operation mode includes:

[0035] Receive set or changed parameters through the communication unit;

[0036] The communication device receives the AC frequency and cleaning width parameters sent by the master device and uses the AC frequency and cleaning width parameters as the phase output parameters.

[0037] The system receives phase information through an input unit and adjusts its own phase information according to the phase information.

[0038] The adjusted phase information is output to other devices through the output unit.

[0039] In one embodiment of this disclosure, the other device is a welding power source or other coordination controller.

[0040] In the AC coordinated control system according to an embodiment of the present disclosure, multiple welding power supplies are controlled by a coordinated controller to keep the output phase of the multiple welding power supplies that are welding simultaneously consistent. This effectively reduces the back voltage of the IGBT and the occurrence of welding power supply alarms, improves the lifespan of the power supply, reduces the time for users to handle alarm problems, and improves production efficiency.

[0041] In the operation method of the coordination controller according to the embodiments of this disclosure, parameters of AC frequency and cleaning width are sent or received through the communication unit, and phase information of corresponding frequency and cleaning width is output or received through the output unit or input unit. The device or welding power supply compares its own output phase with the received phase information and adjusts the output phase based on the difference, thereby maintaining phase consistency with the main coordination controller. This ensures the consistency between the output phases of each welding power supply, effectively reduces the reverse voltage of IGBTs and welding power supply alarms, improves the lifespan of the power supply, reduces the time for users to handle alarm problems, and improves production efficiency. Attached Figure Description

[0042] Figure 1 A structural block diagram of an AC coordination control system according to an embodiment of the present disclosure is shown;

[0043] Figure 2 A structural block diagram of an AC coordination control system according to yet another embodiment of the present disclosure is shown;

[0044] Figure 3 An operational flowchart of a coordination controller in an AC coordination control system according to an embodiment of the present disclosure is shown;

[0045] Figure 4 A schematic diagram of a series structure of multiple coordination controllers in an AC coordination control system according to an embodiment of the present disclosure is shown.

[0046] Figure 5A schematic diagram of a parallel structure of multiple coordination controllers in an AC coordination control system according to an embodiment of the present disclosure is shown; and

[0047] Figure 6 A schematic diagram of a hybrid connection structure of multiple coordination controllers in an AC coordination control system according to an embodiment of the present disclosure is shown. Detailed Implementation

[0048] The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present disclosure will become clearer and more apparent.

[0049] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0050] Furthermore, the technical features involved in the different embodiments of this disclosure described below can be combined with each other as long as they do not conflict with each other.

[0051] During AC TIG welding, the current direction changes periodically. The frequency and positive / negative ratio of this change are determined by the AC frequency and clean width set by the power supply. The clean width refers to the duty cycle of the negative wave. When multiple welding machines simultaneously weld the same workpiece using AC, the asynchronous phase of the AC waveforms between the power supplies can cause an increase in the reverse voltage of the power supply's IGBTs and trigger an alarm on the welding power supply.

[0052] To address this, embodiments of this disclosure provide an AC coordinated control system that ensures the phase of the welding power supply output remains consistent during simultaneous welding, effectively reducing IGBT reverse voltage and welding power supply alarms, improving power supply lifespan, reducing user time spent handling alarm issues, and increasing production efficiency.

[0053] At least one embodiment of this disclosure provides an AC coordination control system, such as Figure 1 As shown, it includes a first coordination controller 101 and at least two welding power sources. The first coordination controller 101 includes a parameter setting unit, a communication unit, an output unit, and a control unit.

[0054] The parameter setting unit is configured to set parameters required for welding, such as AC frequency and cleaning width, where the cleaning width refers to the duty cycle of the negative wave. The communication unit is configured to communicate with an external device, which can be a welding power supply or a second coordination controller. The first coordinator 101 and the second coordination controller are the same coordinator. When the first coordination controller 101 is the master device, the communication unit is configured to send the parameters set by the parameter setting unit to the external device; when the first coordination controller 101 is the slave device, the communication unit is configured to receive the parameters required for welding from the external device.

[0055] The output unit is configured to output the phase of the first coordinating controller to other devices, namely welding power supplies or other coordinating controllers.

[0056] The control unit is connected to each of the parameter setting unit, the communication unit, and the output unit, and is configured to receive parameters set by the parameter setting unit, control the communication unit to send the parameters set by the parameter setting unit to an external device, and control the output unit to output the phase of the first coordination controller to the at least two welding power sources.

[0057] The at least two welding power sources are configured to output a welding current synchronized with the phase of the first coordination controller in response to receiving the parameters sent by the communication unit and the phase of the first coordination controller sent by the output unit.

[0058] In one embodiment of this disclosure, the first coordinating controller has an input unit configured to determine whether the first coordinating controller is connected to other coordinating controllers, and to receive phases output by other coordinating controllers through their output units. The input unit is connected to the control unit and is further configured to send the determination result of whether the first coordinating controller is connected to other coordinating controllers to the control unit, and to send the phases received from other coordinating controllers to the control unit.

[0059] In one embodiment of this disclosure, the output unit of the first coordination controller has at least two output ports.

[0060] In one embodiment of this disclosure, the output unit is configured to output phase parameters of the first coordination controller, the phase parameters corresponding to the frequency and the cleaning width.

[0061] In one embodiment of this disclosure, the communication unit may communicate in a bus-based mode. For example, the communication unit may communicate based on an RS-485 serial bus. As another example, the communication unit may communicate based on a CAN bus.

[0062] In the AC coordinated control system according to an embodiment of this disclosure, the first coordinated controller further includes an input unit configured to determine whether the first coordinated controller is connected to other coordinated controllers, and to receive phase parameters output by other coordinated controllers through their output units. When the input unit of the first coordinated controller is not connected to other coordinated controllers, the first coordinated controller is a master device; when the input unit of the first coordinated controller is connected to other coordinated controllers, the first coordinated controller is a slave device.

[0063] Figure 2 A connection diagram of an AC coordination control system according to yet another embodiment of the present disclosure is shown. Figure 2 As shown, the AC coordinated control system includes a first coordinated controller 101, a second coordinated controller 102, and multiple welding power sources 201-205. The first coordinated controller 101 and the second coordinated controller 102 have the same structure, each including a parameter setting unit, a communication unit, an input unit, an output unit, and a control unit. The communication unit of the first coordinated controller 101 is connected to the communication unit of the second coordinated controller 102, and also connected to each of the multiple welding power sources. The output unit of the first coordinated controller 101 is connected to the input unit of the second coordinated controller 102. The output unit of the first coordinated controller 101 is also connected to welding power sources 201 and 202. The output unit of the second coordinated controller 102 is connected to welding power sources 203-205.

[0064] Figure 3 The control logic of a first coordination controller 101 and a second coordination controller 102 in an AC coordination control system according to an embodiment of the present disclosure is shown. For example... Figure 3 As shown, the first coordination controller 101 determines whether it is a master or slave device by controlling its input unit to determine whether the input unit is connected to the output unit of another coordination controller. Since the input unit of the first coordination controller 101 is not connected to any other coordination controller, the input unit determines that the first coordination controller 101 is a master device. During operation, regardless of whether the first coordination controller is a master or a slave device, it continuously determines its external connection status. When the external connection status changes, the master / slave status also changes.

[0065] The first coordinating controller 101, acting as the master device, will send the parameters from the parameter setting unit to other devices via the communication unit after a delay when the parameters are set for the first time. If it is not the first time, and the parameter setting unit has reset the parameters (i.e., the parameter settings have changed), the communication unit will resend the new parameters after a delay, for example, one second, to prevent the parameters from being sent out before the parameter setting is complete, thus preventing the slave devices from receiving the parameters before the parameter setting is finished. Throughout the process, the first coordinating controller 101 will control the output unit to output the corresponding frequency and cleaning width phase information according to the AC frequency and cleaning width parameters set by the parameter setting unit. The parameter setting unit can force the communication unit to send frequency and cleaning width information to other devices to prevent newly started devices from not receiving the parameter information sent by the master device before or for other reasons. The phase signal sent out by the first coordinating controller 101 is sent through signal level signals. For example, a high level can be defined as AC positive output, and a low level as AC negative output. Alternatively, a low level can be defined as AC positive output, and a high level as AC negative output.

[0066] The input unit of the second coordinating controller 102 is connected to the output unit of the first coordinating controller 101. The input unit of the second coordinating controller 102 determines that the second coordinating controller 102 is a slave device. When the second coordinating controller 102 acts as a slave device, when its communication unit receives parameters sent by the first coordinating controller 101, it uses the AC frequency and cleaning width parameters sent by the communication unit of the first coordinating controller 101 as the parameters for the phase output of the first coordinating controller 101. During operation, the second coordinating controller 102 collects the phase information received through the input unit, compares it with its own phase information, and then adjusts its own phase to maintain phase consistency with the phase information received by the input unit. For example, the second coordinating controller compares its own output phase with the phase received at the input terminal, calculates the difference, and adjusts it to maintain phase consistency with the master coordinating controller. Finally, it outputs its adjusted phase information to other devices, such as welding power supplies 203-205, through the output unit.

[0067] In one embodiment of this disclosure, the AC coordination control system may include a plurality of coordination controllers. Each coordination controller is connected to at least two welding power sources and configured to synchronize the phases of the at least two welding power sources.

[0068] exist Figures 4 to 6 The diagram illustrates the connection relationships between multiple coordination controllers included in an AC coordination control system according to an embodiment of the present disclosure. For simplicity, in... Figures 4 to 6 The image only shows multiple coordination controllers, but does not show the at least two welding power sources connected to each coordination controller.

[0069] like Figure 4 As shown, an AC coordinated control system according to an embodiment of this disclosure includes four coordinated controllers: a first coordinated controller, a second coordinated controller, a third coordinated controller, and a fourth coordinated controller. The input unit of the first coordinated controller is not connected. The output unit of the first coordinated controller is connected to the input unit of the second coordinated controller, the output unit of the second coordinated controller is connected to the input unit of the third coordinated controller, and the output unit of the third coordinated controller is connected to the input unit of the fourth coordinated controller. The communication unit of the first coordinated controller is connected to the communication units of the second, third, and fourth coordinated controllers. In this architecture, the first coordinated controller acts as the master device, and the second, third, and fourth coordinated controllers act as slave devices, connected in series. Figure 4 The example used is four coordinating controllers connected in series. In practice, three or more coordinating controllers can be connected in series to meet specific system architecture requirements.

[0070] like Figure 5 As shown, an AC coordinated control system according to one embodiment of this disclosure includes four coordinated controllers: a first coordinated controller, a second coordinated controller, a third coordinated controller, and a fourth coordinated controller. The communication unit of the first coordinated controller is connected to the communication units of the second, third, and fourth coordinated controllers. The input unit of the first coordinated controller is not connected, and the output ports of the first coordinated controller's output units are respectively connected to the input units of the second, third, and fourth coordinated controllers. In this architecture, the first coordinated controller acts as the master device, and the second, third, and fourth coordinated controllers act as slave devices, connected in parallel. Figure 5 The example used is the parallel connection of four coordination controllers. In practice, three coordination controllers or more coordination controllers can be connected in parallel to meet the specific system architecture requirements.

[0071] like Figure 6As shown, an AC coordinated control system according to one embodiment of this disclosure includes four coordinated controllers: a first coordinated controller, a second coordinated controller, a third coordinated controller, and a fourth coordinated controller. The communication unit of the first coordinated controller is connected to the communication units of the second, third, and fourth coordinated controllers. The input unit of the first coordinated controller is not connected; the output unit of the first coordinated controller is connected to the input units of the second and third coordinated controllers; and the output unit of the third coordinated controller is connected to the input unit of the fourth coordinated controller. In this architecture, the second and third coordinated controllers are connected in parallel, and the third and fourth coordinated controllers are connected in series. Figure 6 The paper illustrates the hybrid connection method using two coordinating controllers in parallel and two coordinating controllers in series. In implementation, more coordinating controllers can be connected in parallel or in series to meet specific system architecture requirements.

[0072] In the AC coordinated control system according to an embodiment of the present disclosure, multiple welding power supplies are controlled by a coordinated controller to keep the output phase of the multiple welding power supplies that are welding simultaneously consistent. This effectively reduces the back voltage of the IGBT and the occurrence of welding power supply alarms, improves the lifespan of the power supply, reduces the time for users to handle alarm problems, and improves production efficiency.

[0073] At least one embodiment of this disclosure also provides a method for operating a coordination controller to operate the coordination controller described above.

[0074] In one embodiment of this disclosure, such as Figure 2 As shown, the operation method of the coordination controller includes:

[0075] Determine the operating mode of the coordination controller; and

[0076] The coordination controller performs its actions according to the operating mode.

[0077] In one embodiment of this disclosure, determining the operating mode of the coordination controller includes:

[0078] Determine whether the input unit of the coordination controller is connected to other coordination controllers;

[0079] When no other coordinating controller is connected to the input unit, it is determined that the coordinating controller is in master device operation mode; and

[0080] When the input unit is connected to another coordinating controller, it is determined that the coordinating controller is in slave device operation mode.

[0081] In one embodiment of this disclosure, when it is determined that the coordination controller is in master device operation mode, performing the actions of the coordination controller according to the operation mode includes:

[0082] Parameters can be set or changed through the parameter setting unit;

[0083] After setting or changing parameters, a delay is applied before the parameters are sent to other devices via the communication unit; and

[0084] According to the parameters set by the parameter setting unit, the corresponding frequency and cleaning width phase information are output through the output unit.

[0085] In one embodiment of this disclosure, the other device may be another coordination controller or welding power source.

[0086] In one embodiment of this disclosure, when it is determined that the coordination controller is in slave device operation mode, performing the actions of the coordination controller according to the operation mode includes:

[0087] Receive set or changed parameters through the communication unit;

[0088] The communication device receives the AC frequency and cleaning width parameters sent by the master device and uses the AC frequency and cleaning width parameters as the phase output parameters.

[0089] The system receives phase information through an input unit and adjusts its own phase information according to the phase information.

[0090] The adjusted phase information is output to other devices through the output unit.

[0091] In one embodiment of this disclosure, the other device may be another coordination controller or welding power source.

[0092] In the operation method of the coordination controller according to the embodiments of this disclosure, parameters of AC frequency and cleaning width are sent or received through the communication unit, and phase information of corresponding frequency and cleaning width is output or received through the output unit or input unit. The device or welding power supply compares its own output phase with the received phase information and adjusts the output phase based on the difference, thereby maintaining phase consistency with the main coordination controller. This ensures the consistency between the output phases of each welding power supply, effectively reduces the reverse voltage of IGBTs and welding power supply alarms, improves the lifespan of the power supply, reduces the time for users to handle alarm problems, and improves production efficiency.

[0093] In the description of this disclosure, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "back", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship in the working state of this disclosure, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0094] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. Those skilled in the art can understand the specific meaning of these terms in this disclosure based on the specific circumstances.

[0095] The present disclosure has been described above with reference to preferred embodiments; however, these embodiments are merely exemplary and illustrative. Various substitutions and modifications can be made to the present disclosure based on these embodiments, all of which fall within the protection scope of the present disclosure.

Claims

1. An AC coordinated control system, comprising a first coordinated controller and at least two welding power sources, wherein the first coordinated controller includes a parameter setting unit, a communication unit, an input unit, an output unit, and a control unit, wherein, The control unit is connected to the parameter setting unit, the communication unit, the input unit, and the output unit, and is configured to control the operation of the parameter setting unit, the communication unit, and the output unit. The parameter setting unit is configured to set the parameters required for welding; The communication unit communicates with each of the at least two welding power sources and is configured to send the parameters to each of the at least two welding power sources; The input unit is configured to determine whether the first coordination controller is connected to other coordination controllers, and to receive the phase output by other coordination controllers through the output unit; If the input unit determines that the first coordination controller is connected to other coordination controllers, the control unit determines that the first coordination controller is a slave device; if the input unit determines that the first coordination controller is not connected to other coordination controllers, the control unit determines that the first coordination controller is a master device. The output unit is connected to the at least two welding power sources and is configured to output the phase of the first coordinating controller to the at least two welding power sources; the at least two welding power sources are configured to output a welding current synchronized with the phase of the first coordinating controller in response to receiving the parameters and the phase of the first coordinating controller.

2. The AC coordinated control system in accordance with claim 1, wherein, The output unit of the first coordination controller has at least two output ports.

3. The AC coordinated control system in accordance with claim 1, wherein, The parameters include frequency and cleaning width.

4. The AC coordination control system according to claim 1, wherein the communication unit communicates based on a bus mode.

5. The AC coordinated control system in accordance with claim 1, wherein, The communication unit communicates based on a serial bus.

6. The AC coordinated control system in accordance with claim 1, wherein, The communication unit communicates based on the CAN bus.

7. The AC coordinated control system of claim 1, further comprising: The first coordination controller is connected to the communication units of the second and third coordination controllers via its communication unit, and is also connected to the input units of the second and third coordination controllers via its output unit.

8. The AC coordinated control system of claim 7, further comprising a fourth coordinated controller, wherein, The first coordination controller is connected to the communication unit of the fourth coordination controller through its communication unit, and the third coordination controller is connected to the input unit of the fourth coordination controller through its output unit.

9. The AC coordination control system according to claim 1, further comprising: A second coordination controller and a third coordination controller, wherein the first coordination controller is connected to the communication units of the second and third coordination controllers via its communication unit, and is connected to the input unit of the second coordination controller via its output unit, and the second coordination controller is connected to the input unit of the third coordination controller via its output unit.

10. An operation method for an AC coordination controller, applied to a first coordination controller, the first coordination controller comprising a parameter setting unit, a communication unit, an input unit, an output unit, and a control unit, the method comprising: The parameters required for welding are set through the parameter setting unit; The communication unit communicates with each of at least two welding power sources and sends the parameters to each of the at least two welding power sources. The input unit determines whether the first coordinating controller is connected to other coordinating controllers and receives the phase output from other coordinating controllers. If the input unit determines that the first coordination controller is connected to other coordination controllers, the control unit determines that the first coordination controller is a slave device; if the input unit determines that the first coordination controller is not connected to other coordination controllers, the control unit determines that the first coordination controller is a master device. The output unit is connected to the at least two welding power sources and outputs the phase of the first coordination controller to the at least two welding power sources, so that the at least two welding power sources, in response to receiving the parameters and the phase of the first coordination controller, output a welding current synchronized with the phase of the first coordination controller.

11. The method according to claim 10, wherein, When the first coordination controller is determined to be the master device by the control unit, the method further includes: The parameters required for welding can be set or changed through the parameter setting unit; After setting or changing the parameters, a delay is established, and the parameters are then sent to other devices via the communication unit; and According to the parameters set by the parameter setting unit, the corresponding frequency and cleaning width phase information are output by the output unit.

12. The method according to claim 11, wherein, The other equipment is a welding power source or other coordination controller.

13. The method according to claim 10, wherein, When the control unit determines that the first coordination controller is a slave device, the method further includes: The communication unit receives the set parameters or the changed parameters. The communication device receives the AC frequency and cleaning width parameters sent by the master device and uses the AC frequency and cleaning width parameters as phase output parameters. The input unit receives phase information, and the phase information is adjusted according to the phase information. The adjusted phase information is output to other devices through the output unit.

14. The method according to claim 13, wherein, The other equipment is a welding power source or other coordination controller.

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