CAN (Controller Area Network) mode alternating current coordination control system and control method

Abstract

The invention discloses a CAN (Controller Area Network) mode alternating current coordination control system and a control method in the technical field of welding power supplies, and aims to solve the problems of quantity limitation of coordination welding power supplies and complexity of cable electrical connection. The control system comprises a CAN bus and a plurality of welding power sources in communication connection with the CAN bus, and each welding power source comprises a CAN communication unit, an address automatic judgment unit, a master-slave judgment unit, a parameter setting unit, a coordination processing unit and an alternating current waveform control unit. According to the invention, waveform phase information and master-slave information can be transmitted through a CAN bus communication mode, the consistency of master-slave phase coordination is realized, the complexity of line connection between power supplies is reduced, the control precision of phase coordination is improved, and the problem that the number of coordinated power supplies is limited is solved.

Description

Technical Field

[0001] The invention relates to a CAN mode AC coordinated control system and a control method, belonging to the technical field of welding power supplies. Background Art

[0002] TIG welding is widely used and is divided into DC TIG and AC TIG. Among them, AC TIG welding is mainly used in the welding of non-ferrous metal materials, including aluminum, aluminum alloys, etc., and is widely used in modern industrial fields such as automobiles and aerospace. During AC TIG welding, the direction of the current changes periodically. The frequency of change and the positive and negative ratio are determined by the AC frequency and cleaning width set by the power supply. When multiple welding power supplies use AC TIG to weld a workpiece at the same time, the AC waveform phases between the power supplies are not synchronized, which will cause mutual influence between the welding power supplies during the welding process.

[0003] The existing coordination technology uses communication to transfer parameters, and uses IO output to transfer phase information and master-slave information. In order to ensure the reliability of the signal in the system and the uniqueness of the host, the output signal of each welding power supply must be connected to the input of other power supplies, so the number of input IOs of the welding power supply is 2*(N-1), where N is the total number of welding power supplies in the system. As the number of welding power supplies in the system increases, the number of IOs used to transmit phase information and master-slave information will increase. Due to the limitation of the number of controller IOs, the number of welding power supplies in the system will be limited. In addition, the increase in the number of IOs will also make the electrical connection more complicated. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a CAN-based AC coordinated control system and control method to solve the problem of limited number of coordinated welding power supplies and the complexity of cable electrical connections caused by the IO method. Waveform phase information and master-slave information are transmitted through the CAN bus communication method to achieve consistency in master-slave phase coordination, reduce the complexity of indirect lines between power supplies, improve the control accuracy of phase coordination, and solve the problem of limited number of coordinated power supplies.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a CAN mode AC coordinated control system, comprising a CAN bus and a plurality of welding power supplies communicatively connected to the CAN bus, each of the welding power supplies comprising: CAN communication unit, used to send and receive communication data transmitted by the CAN bus; The automatic address determination unit is used to configure an independent ID (welding power source address) for the welding power source through the data sent and received by the CAN communication unit; The master-slave determination unit is used to determine whether the welding power source is a master or a slave according to the local current detection signal and the data received by the CAN communication unit, and send the master-slave information to the coordination processing unit and to the CAN bus through the CAN communication unit; A parameter setting unit, used for setting AC parameters and sending the AC parameters to the AC waveform control unit and the coordination processing unit; A coordination processing unit, used for receiving master-slave information, waveform phase information, calculating a phase adjustment value according to the waveform phase information and the local phase and sending the value to the AC waveform control unit, and sending the host phase to the CAN communication unit; The AC waveform control unit is used to output an AC waveform according to the AC parameters and the phase adjustment value.

[0006] Furthermore, the AC data transmitted by the CAN bus includes: waveform phase information, current detection information, master-slave information, alarm information, question-and-answer information, host address, and AC parameters.

[0007] In a second aspect, the present invention provides a CAN mode AC coordination control method, based on the CAN mode AC coordination control system described in the first aspect, comprising: The automatic address determination unit configures an independent ID for each welding power source through the question and answer information sent and received by the CAN communication unit, and the IDs are arranged from small to large; The master-slave determination unit determines whether the welding power source is a master or a slave based on the local current detection signal and the data received by the CAN communication unit; The parameter setting unit is responsible for setting the AC parameters and transmitting the AC parameters to the AC waveform control unit and the coordination processing unit; The coordination processing unit sends the waveform phase information of the welding power source or receives the waveform phase information and AC parameter information sent by the host, and calculates the phase adjustment value; The AC waveform control unit outputs an AC waveform according to the host AC parameters combined with the phase adjustment value.

[0008] Furthermore, the automatic address determination unit configures an independent ID (welding power source address) for each welding power source through the question and answer information sent and received by the CAN communication unit, and the IDs are arranged from small to large, including: After the welding power source is turned on, when the CAN communication unit does not receive a data frame signal for coordination within a preset time T1, the welding power source sends a remote frame ID to the CAN bus; when the CAN communication unit receives a data frame signal for coordination within a preset time T1, the welding power source waits until the CAN communication unit does not receive a data frame signal within a specified time T1, and then sends a remote frame ID to the CAN bus; the remote frame ID starts from the minimum frame ID specified by the system; When the remote frame ID has a response within the preset time T3, the remote frame ID is recorded, and the remote frame ID is added by +1 before sending a new remote frame ID; When the remote frame ID has no response within the preset time T3, the address of the welding power source is determined to be the remote frame ID value.

[0009] The automatic address determination unit records all IDs in the system in a welding power supply record table.

[0010] Furthermore, the master-slave determination unit determines whether the welding power source is a master or a slave based on the local current detection signal and the data received by the CAN communication unit, including: In the initial state, all welding power sources in the system are slaves; After powering on, when the master-slave determination unit determines that the CAN communication unit has not received the host coordination data frame sent by other welding power sources within the preset time T1, and detects that the welding power source has a current detection signal, it determines that the welding power source is converted from a slave to a master, and at the same time sends a coordination data frame with a master to the CAN bus through the CAN communication unit; During the welding process, when the host stops welding, the welding power source changes from the host to the slave, and at the same time sends a coordination data frame to the CAN bus through the CAN communication unit to indicate that the welding power source changes from the host to the slave; When the master-slave judgment unit of the slave detects that the welding power source has a current detection signal, and the host in the system exits the host mode, and the delay time of the welding power source ID value * T2 does not receive the coordination data frame, the welding power source is judged as the host, and the coordination data frame with the host is sent to the CAN bus; after the welding power source in the system that has not ended the delay receives the coordination data frame with the host, the delay judgment ends and the host switching stops. This process can ensure that when the host in the system exits the host mode, the welding power source with a smaller ID value that is welding becomes the host first.

[0011] Further, the sending of the host coordination data frame to the CAN bus through the CAN communication unit also includes: The master-slave information and waveform phase information are sent to the CAN bus via the CAN communication unit; When the waveform phase information changes, the CAN communication unit sends the changed waveform phase information to the CAN bus to achieve phase synchronization.

[0012] Furthermore, the coordination processing unit sends the waveform phase information of the welding power source or receives the waveform phase information and AC parameter information sent by the host, and calculates the phase adjustment value, including: When the welding power source is the host, the coordination processing unit sends the waveform phase information of the welding power source to the CAN bus through the CAN communication unit; When this welding power supply is a slave, the coordination processing unit receives the waveform phase information and the set AC parameter information sent by the host, calculates the phase difference according to the waveform phase information of this welding power supply and the received waveform phase information, and calculates the phase adjustment value according to the phase difference and the time difference caused by the communication delay.

[0013] Furthermore, the AC parameters include AC frequency and cleaning width.

[0014] Furthermore, the AC waveform control unit outputs an AC waveform according to the host AC parameter combined with the phase adjustment value, including: When this welding power source is the main machine, it outputs AC waveform according to the AC frequency and cleaning width set by the machine; When the welding power source is a slave, an AC waveform is output according to the AC frequency and cleaning width received from the host and the phase adjustment value calculated by the coordination processing unit.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The CAN mode AC coordinated control system of the present invention is connected by bus mode, so as to realize the CAN bus communication mode to transmit phase information and master-slave information, and the number of cables is significantly reduced. According to the number of ID numbers of CAN communication, the number of power supplies can theoretically reach 2048; The present invention uses CAN communication, and the host sends a phase signal to the slave in the system. The slave receives the phase signal and adjusts the phase of its own waveform to make the output waveform phase consistent with the phase of the host, thereby achieving consistent phase output of all power supplies in the welding system, avoiding the influence of AC waveforms of different phases on other welding power supplies, reducing the complexity of indirect lines between power supplies, and improving the control accuracy of phase coordination. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural block diagram of a CAN mode AC coordinated control system provided by Example 1 of the present invention; Figure 2 is a flowchart of the automatic address determination unit described in Example 2 of the present invention; Figure 3 is a flowchart of the master-slave determination unit described in Example 2 of the present invention; Figure 4 is a workflow diagram of the coordination processing unit described in Example 2 of the present invention; Figure 5 This is a working flow chart of the AC output unit described in Example 2 of the present invention. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0018] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0019] Example 1 This embodiment provides a CAN mode AC coordination control system, such as Figure 1 As shown, it includes a CAN bus and a plurality of welding power sources connected to the CAN bus in communication. Each of the welding power sources includes: a CAN communication unit, an automatic address determination unit, a master-slave determination unit, a parameter setting unit, a coordination processing unit and an AC waveform control unit.

[0020] like Figure 1 As shown, the CAN communication unit is used to send and receive AC data transmitted by the CAN bus; the AC data includes: waveform phase information, current detection information, master-slave information, alarm information, question and answer information, host address, and AC parameters.

[0021] The automatic address determination unit is used to configure an independent ID (welding power supply address) for the welding power supply through the data sent and received by the CAN communication unit. Through the automatic address determination unit, the welding machine address is determined without manual setting, ensuring that the address of the machine does not conflict with the addresses of other welding machines in the system.

[0022] The master-slave determination unit is used to determine whether the welding power source is a master or a slave according to the current detection signal and the data received by the CAN communication unit, and send the master-slave information to the coordination processing unit. When the welding power source is the master, the master-slave determination unit sends the master-slave information to the CAN bus through the CAN communication unit.

[0023] The parameter setting unit is used to set AC parameters and send the AC parameters to the AC waveform control unit and the coordination processing unit; the AC parameters include AC frequency and cleaning width.

[0024] The coordination processing unit is the core processing unit of the coordination control system, which is mainly responsible for receiving master-slave information, waveform phase information, calculating the phase adjustment value according to the waveform phase information and the local phase and sending it to the AC waveform control unit, and sending the host phase to the CAN communication unit.

[0025] The AC waveform control unit is used to output an AC waveform according to the AC parameters and the phase adjustment value.

[0026] Example 2 This embodiment provides a CAN mode AC coordination control method, based on the CAN mode AC coordination control system described in Example 1. The CAN mode AC coordination control method provided in this embodiment can be applied to a terminal, and can be executed by a CAN mode AC coordination control device, which can be implemented by software and / or hardware, and can be integrated in a terminal, for example: any smart phone, tablet computer or computer device with communication function. Figures 2 to 5 , the control method specifically comprises the following steps: (1) The automatic address determination unit configures an independent ID for each welding power source through the question and answer information sent and received by the CAN communication unit, and the IDs are arranged from small to large.

[0027] Specifically, Figure 2 The flowchart is a flowchart of the method for address determination and recording by the automatic address determination unit in this embodiment. This flowchart only shows the logical sequence of the method in this embodiment. In other possible embodiments of the present invention, different methods may be used without conflict. Figure 2 The steps shown or described are performed in the order shown. Figure 2 The method for automatically determining and recording addresses in this embodiment specifically includes the following steps: After the welding power source is turned on, when the CAN communication unit does not receive a data frame signal for coordination within a preset time T1 (T1 is the time for determining the coordination data frame signal in the system, which is set to 100ms in this embodiment), the welding power source sends a remote frame ID to the CAN bus; when the CAN communication unit receives a data frame signal for coordination within the preset time T1, the welding power source waits until the CAN communication unit does not receive a data frame signal within the preset time T1, and then sends a remote frame ID to the CAN bus; the remote frame ID starts from the minimum frame ID specified by the system; When the remote frame ID has a response within the preset time T3 (T3 is the response time for determining the remote frame, which is set to 100ms in this embodiment), the remote frame ID is recorded, and the remote frame ID is added by +1 before sending a new remote frame ID; When the remote frame ID has no response within the preset time T3, the address of the welding power source is determined to be the remote frame ID value.

[0028] The automatic address determination unit records all IDs in the system in a welding power supply record table.

[0029] (2) The master-slave determination unit determines whether the welding power source is the master or the slave based on the local current detection signal and the data received by the CAN communication unit.

[0030] Specifically, Figure 3 is a flowchart of the method for master-slave determination by the master-slave determination unit in this embodiment. This flowchart only shows the logical sequence of the method in this embodiment. In other possible embodiments of the present invention, different methods may be used without conflict. Figure 3 The steps shown or described are performed in the order shown. Figure 3 The master-slave determination method described in this embodiment specifically includes the following steps: The initial state is that all welding power supplies in the system are not welding and all welding power supplies are slaves.

[0031] Since the welding power supply with current detection is the master state in the system, and the other welding power supplies are slave states. Therefore, after the power is turned on, when the master-slave determination unit determines that the CAN communication unit has not received the master coordination data frame sent by other welding power supplies within the preset time T1, and detects that the welding power supply has a current detection signal, it determines that the welding power supply is converted from a slave to a master, and at the same time sends the coordination data frame with the master to the CAN bus through the CAN communication unit; in this process, the master-slave information and waveform phase information are sent to the CAN bus through the CAN communication unit; when the waveform phase information changes, the CAN communication unit sends the changed waveform phase information to the CAN bus to achieve phase synchronization.

[0032] During the welding process, when the host stops welding (arc is broken or the gun is stopped to extinguish the arc), the welding power supply changes from the host to the slave, and at the same time sends a coordination data frame to the CAN bus through the CAN communication unit to indicate that the welding power supply changes from the host to the slave.

[0033] When the master-slave determination unit of the slave detects that the welding power supply has a current detection signal, the host in the system exits the host mode, and if no coordination data frame is received within the delay time of the welding power supply ID value * T2 (set to 200 us in this embodiment), the welding power supply is determined to be changed from a slave to a host, and at the same time, a coordination data frame with a host is sent to the CAN bus to inform other welding power supply systems that there is already a host; after the welding power supply in the system whose delay has not ended receives the coordination data frame with a host, the delay determination ends and the host switching stops; this process can ensure that when the host in the system exits the host mode, the welding power supply with a smaller ID value that is welding becomes the host first.

[0034] (3) The parameter setting unit is responsible for setting the AC parameters and transmitting the AC parameters to the AC waveform control unit and the coordination processing unit.

[0035] Specifically, the parameter setting unit is responsible for setting AC parameters, including AC frequency and cleaning width. The parameter setting unit transmits the set AC parameters to the AC waveform control unit and the coordination processing unit. When the welding power source is the host, the AC waveform control unit outputs the AC waveform according to the set AC parameters. At the same time, the coordination processing unit writes the AC parameters transmitted by the parameter setting unit to the corresponding data of the CAN communication unit, and sends it to the CAN bus through the CAN communication unit.

[0036] (4) The coordination processing unit sends the waveform phase information of the welding power source or receives the waveform phase information and AC parameter information sent by the host, and calculates the phase adjustment value.

[0037] Specifically, Figure 4 is a flowchart of the coordination processing unit in this embodiment. This flowchart only shows the logical sequence of the method in this embodiment. In other possible embodiments of the present invention, different methods may be used without conflict. Figure 4 The steps shown or described are performed in the order shown. Figure 4 The method for performing coordination processing by the coordination processing unit in this embodiment specifically includes the following steps: According to the active state determined by the active determination unit, When the welding power source is the host, the coordination processing unit sends the waveform phase information of the welding power source to the CAN bus through the CAN communication unit; When this welding power supply is a slave, the coordination processing unit receives the waveform phase information and the set AC parameter information sent by the host, calculates the phase difference according to the waveform phase information of this welding power supply and the received waveform phase information, and calculates the phase adjustment value according to the phase difference and the time difference caused by the communication delay, that is, the phase difference + the time difference caused by the communication delay, and passes the calculated phase adjustment value to the AC waveform control unit.

[0038] (5) The AC waveform control unit outputs an AC waveform according to the host AC parameters combined with the phase adjustment value.

[0039] Specifically, Figure 5 is a flowchart of the AC waveform control unit in this embodiment. This flowchart only shows the logical sequence of the method in this embodiment. In other possible embodiments of the present invention, different methods may be used without conflict. Figure 5 The steps shown or described are performed in the order shown. Figure 5 The method for performing AC waveform control by the AC waveform control unit in this embodiment specifically includes the following steps: When this welding power source is the main machine, it outputs AC waveform according to the AC frequency and cleaning width set by the machine; When the welding power source is a slave, an AC waveform is output according to the AC frequency and cleaning width received from the host and the phase adjustment value calculated by the coordination processing unit.

[0040] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0041] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0042] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0043] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A CAN mode AC coordinated control system, characterized in that: The invention comprises a CAN bus and a plurality of welding power supplies communicatively connected to the CAN bus, each of the welding power supplies comprising: CAN communication unit, used to send and receive communication data transmitted by the CAN bus; The automatic address determination unit is used to configure an independent ID for the welding power source through the data sent and received by the CAN communication unit; The master-slave determination unit is used to determine whether the welding power source is a master or a slave according to the local current detection signal and the data received by the CAN communication unit, and send the master-slave information to the coordination processing unit and to the CAN bus through the CAN communication unit; A parameter setting unit, used for setting AC parameters and sending the AC parameters to the AC waveform control unit and the coordination processing unit; A coordination processing unit, used for receiving master-slave information, waveform phase information, calculating a phase adjustment value according to the waveform phase information and the local phase and sending the value to the AC waveform control unit, and sending the host phase to the CAN communication unit; The AC waveform control unit is used to output an AC waveform according to the AC parameters and the phase adjustment value.

2. The CAN mode AC coordinated control system according to claim 1 is characterized in that: The AC data transmitted by the CAN bus includes: waveform phase information, current detection information, master-slave information, alarm information, question-and-answer information, host address, and AC parameters.

3. A CAN mode AC coordination control method, based on the CAN mode AC coordination control system according to any one of claims 1 or 2, characterized in that it comprises: The automatic address determination unit configures an independent ID for each welding power source through the question and answer information sent and received by the CAN communication unit, and the IDs are arranged from small to large; The master-slave determination unit determines whether the welding power source is a master or a slave based on the local current detection signal and the data received by the CAN communication unit; The parameter setting unit is responsible for setting the AC parameters and transmitting the AC parameters to the AC waveform control unit and the coordination processing unit; The coordination processing unit sends the waveform phase information of the welding power source or receives the waveform phase information and AC parameter information sent by the host, and calculates the phase adjustment value; The AC waveform control unit outputs an AC waveform according to the host AC parameters combined with the phase adjustment value.

4. The CAN mode AC coordination control method according to claim 3 is characterized in that: The automatic address determination unit configures an independent ID for each welding power source through the question and answer information sent and received by the CAN communication unit, and the IDs are arranged from small to large, including: After the welding power source is turned on, when the CAN communication unit does not receive a data frame signal for coordination within a preset time T1, the welding power source sends a remote frame ID to the CAN bus; when the CAN communication unit receives a data frame signal for coordination within a preset time T1, the welding power source waits until the CAN communication unit does not receive a data frame signal within a specified time T1, and then sends a remote frame ID to the CAN bus; the remote frame ID starts from the minimum frame ID specified by the system; When the remote frame ID has a response within the preset time T3, the remote frame ID is recorded, and the remote frame ID is added by +1 before sending a new remote frame ID; When the remote frame ID has no response within the preset time T3, the address of the welding power source is determined to be the remote frame ID value.

5. The CAN mode AC coordination control method according to claim 3 is characterized in that: The master-slave determination unit determines whether the welding power source is a master or a slave based on the local current detection signal and the data received by the CAN communication unit, including: In the initial state, all welding power sources in the system are slaves; After powering on, when the master-slave determination unit determines that the CAN communication unit has not received the host coordination data frame sent by other welding power sources within the preset time T1, and detects that the welding power source has a current detection signal, it determines that the welding power source is converted from a slave to a master, and at the same time sends a coordination data frame with a master to the CAN bus through the CAN communication unit; During the welding process, when the host stops welding, the welding power source changes from the host to the slave, and at the same time sends a coordination data frame to the CAN bus through the CAN communication unit to indicate that the welding power source changes from the host to the slave; When the master-slave judgment unit of the slave detects that the welding power supply has a current detection signal, and the host in the system exits the host mode, and no coordination data frame is received within the delay time of the welding power supply ID value * T2, the welding power supply is judged to be changed from a slave to a host, and a coordination data frame with a host is sent to the CAN bus at the same time; after the welding power supply in the system whose delay has not ended receives the coordination data frame with a host, the delay judgment ends and the host switching stops.

6. The CAN mode AC coordination control method according to claim 5 is characterized in that: The method of sending a coordinated data frame with a host to the CAN bus through the CAN communication unit also includes: The master-slave information and waveform phase information are sent to the CAN bus via the CAN communication unit; When the waveform phase information changes, the CAN communication unit sends the changed waveform phase information to the CAN bus to achieve phase synchronization.

7. The CAN mode AC coordination control method according to claim 3 is characterized in that: The coordination processing unit sends the waveform phase information of the welding power source or receives the waveform phase information and AC parameter information sent by the host, and calculates the phase adjustment value, including: When the welding power source is the host, the coordination processing unit sends the waveform phase information of the welding power source to the CAN bus through the CAN communication unit; When this welding power supply is a slave, the coordination processing unit receives the waveform phase information and the set AC parameter information sent by the host, calculates the phase difference according to the waveform phase information of this welding power supply and the received waveform phase information, and calculates the phase adjustment value according to the phase difference and the time difference caused by the communication delay.

8. The CAN mode AC coordination control method according to claim 3 is characterized in that: The AC parameters include AC frequency and cleaning width.

9. The CAN mode AC coordination control method according to claim 8 is characterized in that: The AC waveform control unit outputs an AC waveform according to the host AC parameters combined with the phase adjustment value, including: When this welding power source is the main machine, it outputs AC waveform according to the AC frequency and cleaning width set by the machine; When the welding power source is a slave, an AC waveform is output according to the AC frequency and cleaning width received from the host and the phase adjustment value calculated by the coordination processing unit.

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