A multi-arc power supply control device in a vacuum arc coating system and a control method thereof
By introducing a multi-arc power supply control device that connects an intermediate conversion box to optical fiber in the vacuum arc coating system, the problems of complex wiring, slow control speed, and poor anti-interference ability are solved, achieving efficient parallel control and stable transmission, and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SOUTHWESTERN INST OF PHYSICS
- Filing Date
- 2022-07-08
- Publication Date
- 2026-07-10
AI Technical Summary
Existing multi-arc power supply control devices suffer from problems such as complex wiring, slow control speed, poor anti-interference capability, and high cost.
A multi-arc power supply control device that uses an intermediate conversion box and fiber optic connection achieves parallel control and fiber optic transmission through an FPGA main chip, simplifying wiring and improving interference immunity.
It improves control speed, meets the real-time requirements of coating, reduces wiring difficulty and cost, and enhances transmission stability.
Smart Images
Figure CN117403191B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of multi-arc power supply control technology in vacuum arc coating systems, specifically relating to a multi-arc power supply control device and its control method in a vacuum arc coating system. Background Technology
[0002] In multi-arc vacuum film deposition systems, the number of arc power supplies used is very large, ranging from a dozen to several dozen units. Moreover, the price of arc power supplies is relatively low among coating power supplies, generally a few thousand yuan per unit. The common host computers on the market are usually touch screens, industrial control computers, or PLCs. The control methods used for multi-arc power supplies are usually analog control or digital control.
[0003] (1) Analog control method, which is electrical signal control. The more arc power sources controlled by this method, the more connection lines there are between the host computer and the arc power sources; for example, if a host computer monitors a single coating arc power source, there are approximately 20 control connection lines. Therefore, it can be inferred that when the host computer controls dozens of arc power sources, the control connection lines are very large, making on-site wiring difficult. In addition, although analog control is fast, it has very poor anti-interference capability in actual use, is prone to misoperation, and results in a high scrap rate of coated parts.
[0004] (2) Digital control method, that is, using 485 communication method, each arc power supply needs to be connected to one double-core cable, and multiple arc power supplies are connected to multiple double-core cables. Due to the transmission of electrical signals, the signal becomes weaker as the distance increases, and the anti-interference capability is generally poor. Moreover, the host computer can only use polling method to access each one one by one, which results in slow control speed and makes it impossible for multiple arc power supplies to execute host computer instructions at the same time. When facing high real-time requirements, it cannot meet the high process requirements.
[0005] (3) Other existing control methods, such as PROFIBUS-DP or TCP-IP, require converters and dedicated connection lines because their protocols are not publicly available, or the stability of communication depends heavily on the stability of the network itself, and the cost is high.
[0006] Therefore, in view of the shortcomings of the existing technology, we continue to design a multi-arc power supply control device and its control method that can simplify arc power supply wiring and improve control speed, control cost and anti-interference capability. Summary of the Invention
[0007] This invention addresses the technical problems of existing multi-arc power supply control devices or methods in vacuum arc coating systems by proposing a multi-arc power supply control device and its control method.
[0008] The technical solution of this invention:
[0009] A multi-arc power supply control device for a vacuum arc coating system includes: a host computer, an intermediate conversion box, a drive power supply, several arc power supplies, optical fiber A and several optical fibers B, a monitor, and a cable; one end of the intermediate conversion box is connected to the host computer via an optical fiber, and the other end of the intermediate conversion box is connected to several arc power supplies via several optical fibers B respectively; the intermediate conversion box is also provided with a spare port, which is connected to the monitor via a cable; the intermediate conversion box is also connected to the drive power supply.
[0010] The intermediate conversion box includes an FPGA main chip, a host computer communication module, an arc power communication module, and an intermediate conversion box status monitoring module. The outer surface of the intermediate conversion box is also provided with a remote / near control switching knob, which is connected to the FPGA main chip inside the intermediate conversion box via a data cable. The FPGA main chip is connected to the host computer communication module, the arc power communication module, and the intermediate conversion box status monitoring module, respectively.
[0011] The host computer communication module is connected to the host computer via optical fiber and is used to receive monitoring commands from the host computer.
[0012] The FPGA main chip is connected to the host computer communication module to receive and parse the instructions issued by the host computer. If the instruction received and parsed by the FPGA main chip is a read instruction, the FPGA main chip will respond directly. If the instruction received and parsed by the FPGA main chip is a control instruction, and the remote control switching knob is in the remote control position, the FPGA main chip will send the parsed host computer control instruction to multiple arc power supply communication modules at the same time.
[0013] The arc power communication module is connected to several arc power sources through several optical fibers B, and the FPGA main chip reads and controls multiple arc power sources through the arc power communication module.
[0014] The intermediate conversion box status monitoring module is connected to the monitor via a cable and is used to receive monitoring commands from the monitor.
[0015] The FPGA main chip is connected to the intermediate conversion box status monitoring module. It receives and parses the instructions issued by the monitor. If the instruction received and parsed by the FPGA main chip is a read instruction, the FPGA main chip responds directly. If the instruction received and parsed by the FPGA main chip is a control instruction, and the remote / near control switching knob is in the near control position, the parsed monitor control instruction is simultaneously sent to the communication modules of multiple arc power supplies. If the instruction received and parsed by the FPGA main chip is a correction instruction, the parameters inside the conversion box are updated and saved. Then, based on the new parameters, the data exchange between the FPGA main chip and the host computer, multiple arc power supplies, and the monitor is restarted.
[0016] Both the host computer communication module and the arc power supply communication module have bidirectional communication capabilities. This means that information from multiple arc power supplies is also transmitted back to the FPGA main chip via the arc power supply communication module, and the FPGA main chip feeds back to the host computer via the host computer communication module.
[0017] The intermediate conversion box status monitoring module and the arc power communication module both have bidirectional communication functions. That is, the information of multiple arc power sources is also transmitted back to the FPGA main chip through the arc power communication module, and the FPGA main chip feeds back to the monitor through the intermediate conversion box status monitoring module. The detection function of the multi-arc power source control device is not limited by the remote and near control switching knob.
[0018] The driving power supply is used to provide power to the intermediate conversion box, converting the input 220V AC power into 5V DC power.
[0019] A control method for a multi-arc power supply control device in a vacuum arc coating system as described above includes the following steps:
[0020] Step 1: Connect the intermediate conversion box to the host computer, the monitor, and the multiple arc power supplies respectively;
[0021] Step 2: Provide 220V power to the multi-arc power supply control device, which will then automatically turn on.
[0022] Step 3: The FPGA main chip arc power communication module starts to read the current status and parameters of multiple arc power supplies in a loop. The FPGA integrates the status and parameters of multiple arc power supplies and saves the data.
[0023] Step 4: After receiving the command from the host computer, the FPGA main chip parses it. If it is a read command, i.e., a request to read the status and data of multiple arc power supplies, the FPGA main chip sends the integrated data from Step 3 to the host computer through the host computer communication module. If it is a control command, such as an arc power supply run command or an arc power supply current write command, the FPGA main chip will determine the status of the remote / near control switching knob. When the remote / near control switching knob is in the remote control state, the parsed control commands of multiple arc power supplies are converted into the command language of a single arc power supply and sent to the corresponding arc power supply respectively.
[0024] At this time, the FPGA main chip can still receive and parse the instructions sent by the monitor, but it will no longer execute the monitor's control instructions; the FPGA main chip can still respond to the monitor's instructions to read multiple arc power supplies; the FPGA main chip can still respond to the monitor's correction instructions.
[0025] Step 5: After the FPGA main chip receives and parses the command sent by the monitor, if it is a read command, i.e., a request to read the status and data of multiple arc power supplies, the FPGA main chip sends the integrated data from Step 3 to the monitor through the host computer communication module; if it is a control command, such as an arc power supply run command or an arc power supply current write command, the FPGA main chip will determine the status of the remote / near control switching knob. If the remote / near control switching knob is in the near control state, the FPGA main chip will convert the parsed control commands of multiple arc power supplies into the command language of a single arc power supply and send them to the corresponding arc power supply respectively; if it is a correction command, the FPGA main chip will modify the internal parameters and save them, and then restart Step 3 according to the new parameters.
[0026] At this time, the FPGA main chip can still receive requests from the host computer to control multiple arc power supplies and parse the instructions, but it will no longer execute the control instructions from the host computer; the FPGA main chip can still respond to the instructions from the host computer to read multiple arc power supplies.
[0027] Steps four and five can be performed simultaneously;
[0028] Step Six: When the arc power supply alarms due to overcurrent or overvoltage, the FPGA main chip integrates the alarm information and feeds it back to the host computer and monitor through the host computer communication module and the intermediate conversion box status monitoring module; the operator can then view the information through the display areas of the host computer and monitor.
[0029] Step 7: When the arc power supply alarms due to overcurrent or overvoltage, the operator can also send a query command through the monitor. The FPGA main chip will return the working log of the intermediate conversion box, which the operator can then query from the monitoring interface of the monitor.
[0030] Step 8: When the environment in which the intermediate converter box is used changes, such as when the number of control arc power supplies changes or when the communication protocol between the intermediate converter box and the host computer needs to be changed, the administrator can send a correction command through the monitor. After receiving the corresponding correction command, the FPGA main chip will make the corresponding program correction.
[0031] The correction instructions include:
[0032] A. Correction of the number of arc power sources;
[0033] B. Changes to communication information such as the communication address, baud rate, stop bits, and amount of communication data required when the intermediate conversion box communicates with the host computer;
[0034] C. Correction of the storage time of the working log in the intermediate conversion box.
[0035] The beneficial effects of this invention are:
[0036] (1) The multi-arc power supply control device in the vacuum arc coating system designed in this invention improves the control speed by setting an intermediate conversion box between multiple arc power supplies and the host computer, changing the previous host computer's polling method to parallel control.
[0037] (2) The control device control method described in this invention can parse a single instruction from the host computer into multiple instructions through an intermediate conversion box and send them to multiple arc power supplies at the same time. This changes the previous serial execution mode (or polling mode) in the control program to a parallel execution mode, ensuring the synchronization of multiple arc power supplies executing instructions at the same time and meeting the process requirements of high real-time coating.
[0038] (3) In this invention, the 485 communication cable that was previously connected to the host computer is converted into an optical fiber, changing from electrical transmission to optical transmission, thereby improving the anti-interference ability in the control process and effectively increasing the transmission length. In addition, the device of this invention converts multiple long-distance transmission cables into a single long optical fiber, reducing the difficulty of wiring.
[0039] (4) The present invention simplifies the internal programming of the host computer by connecting the intermediate conversion box to the host computer for communication.
[0040] (5) By connecting the intermediate conversion box to the monitor, the present invention facilitates the operator's understanding and query of the status of the arc power supply and the intermediate conversion box. By changing the parameters inside the intermediate conversion box through the monitor, the workload of the programmer is simplified, making the intermediate conversion box more flexible and applicable to a wider range. Attached Figure Description
[0041] Figure 1 A schematic diagram of the multi-arc power supply control device in the vacuum arc coating system designed in this invention;
[0042] Figure 2 This is a flowchart of the control method for the multi-arc power supply control device in the vacuum arc coating system described in this invention.
[0043] Among them: 1-Host computer, 2-Intermediate conversion box, 3-Drive power supply, 4-Arc power supply, 5-Fiber optic A, 6-Fiber optic B, 7-Monitor, 8-Cable. Detailed Implementation
[0044] The following detailed description, in conjunction with the accompanying drawings and embodiments, describes a multi-arc power supply control device and its control method in a vacuum arc coating system according to the present invention.
[0045] A multi-arc power supply control device in a vacuum arc coating system includes: a host computer 1, an intermediate conversion box 2, a drive power supply 3, several arc power supplies 4, optical fiber A5 and several optical fibers B6, a monitor 7, and a cable 8; one end of the intermediate conversion box 2 is connected to the host computer 1 via optical fiber 5, and the other end of the intermediate conversion box 2 is connected to several arc power supplies 4 via several optical fibers B6 respectively. The intermediate conversion box 2 is also provided with a spare port, which is connected to the monitor 7 via cable 8. The intermediate conversion box 2 is also connected to the drive power supply 3.
[0046] The intermediate conversion box 2 includes an FPGA main chip, a host computer communication module, an arc power communication module, and an intermediate conversion box status monitoring module. The outer surface of the intermediate conversion box 2 is also provided with a remote / near control switching knob, which is connected to the FPGA main chip inside the intermediate conversion box via a data cable. The FPGA main chip is connected to the host computer communication module, the arc power communication module, and the intermediate conversion box status monitoring module, respectively.
[0047] The host computer communication module is connected to the host computer 1 via optical fiber 5 and is used to receive monitoring commands from the host computer.
[0048] The FPGA main chip is connected to the host computer communication module and receives and parses the instructions issued by the host computer 1. If the instruction received and parsed by the FPGA main chip is a read instruction, the FPGA main chip responds directly. If the instruction received and parsed by the FPGA main chip is a control instruction and the remote control switching knob is in remote control mode, the FPGA main chip sends the parsed host computer 1 control instruction to multiple arc power communication modules at the same time.
[0049] The arc power communication module is connected to several arc power sources 4 via several optical fibers B6. The FPGA main chip reads and controls the multiple arc power sources 4 through the arc power communication module.
[0050] The intermediate conversion box status monitoring module is a backup module that can be connected to the monitor (7) via a cable to receive monitoring instructions from the monitor (7).
[0051] The FPGA main chip is connected to the intermediate conversion box status monitoring module, and receives and parses the instructions issued by the monitor 7. If the instruction received and parsed by the FPGA main chip is a read instruction, the FPGA main chip responds directly. If the instruction received and parsed by the FPGA main chip is a control instruction, and the remote / near control switching knob is in the near control position, the parsed control instruction from the monitor 7 is simultaneously sent to the communication modules of multiple arc power supplies. If the instruction received and parsed by the FPGA main chip is a correction instruction, the parameters inside the conversion box are updated and saved, and then the data exchange between the host computer, multiple arc power supplies, and the monitor is restarted according to the new parameters.
[0052] Both the host computer communication module and the arc power supply communication module have bidirectional communication capabilities. That is, information from multiple arc power supplies 4 is also transmitted back to the FPGA main chip through the arc power supply communication module, and the FPGA main chip feeds back to the host computer 1 through the host computer communication module.
[0053] The intermediate conversion box status monitoring module and the arc power communication module both have bidirectional communication functions. That is, the information of multiple arc power supplies 4 is also transmitted back to the FPGA main chip through the arc power communication module, and the FPGA main chip feeds back to the monitor 7 through the intermediate conversion box status monitoring module. The detection function of the multi-arc power supply control device is not limited by the remote and near control switching knob.
[0054] The driving power supply 3 is used to provide power to the intermediate conversion box. Specifically, it converts the input 220V AC power to 5V DC power, and then converts the 5V DC power to 3.3V, 2.5V and 1.2V. The 5V power supplies the host computer communication module, the arc power communication module and the intermediate conversion box status monitoring module, while the 3.3V, 2.5V and 1.2V power the FPGA main chip.
[0055] A control method for a multi-arc power supply control device in a vacuum arc coating system as described above specifically includes the following steps:
[0056] Step 1: Connect the intermediate conversion box 2 to the host computer 1, the monitor 7, and the multiple arc power supplies 4 respectively. If monitoring is not required, the monitor 7 can be left unconnected.
[0057] Step 2: Provide 220V power to the multi-arc power supply control device, which will then automatically turn on.
[0058] Step 3: The FPGA main chip arc power communication module starts to read the current status and parameters of multiple arc power supplies (4) in a loop. The FPGA integrates the status and parameters of multiple arc power supplies and saves the data.
[0059] Step 4: After receiving the instruction from the host computer 1, the FPGA main chip parses it. If it is a read instruction, that is, a request to read the status and data of multiple arc power supplies 4, the FPGA main chip sends the integrated data in Step 3 to the host computer 1 through the host computer communication module. If it is a control instruction, such as an arc power supply run instruction or an arc power supply current write instruction, the FPGA main chip will determine the status of the remote control switching knob. When the remote control switching knob is in the remote control state (indicating that the host computer 1 is allowed to execute the control instruction), the FPGA main chip will convert the parsed control instructions of multiple arc power supplies 4 into the command language of a single arc power supply 4 and send them to the corresponding arc power supply 4 respectively.
[0060] At this time, the FPGA main chip can still receive and parse the instructions sent by the monitor 7, but no longer execute the control instructions of the monitor 7; the FPGA main chip can still respond to the instructions sent by the monitor 7 to read multiple arc power supplies 4; the FPGA main chip can still respond to the correction instructions of the monitor 7.
[0061] Step 5: After the FPGA main chip receives and parses the command sent by the monitor 7, if it is a read command, i.e. a request to read the status and data of multiple arc power supplies 4, the FPGA main chip sends the integrated data from Step 3 to the monitor 7 through the host computer communication module; if it is a control command, such as an arc power supply run command or an arc power supply current write command, the FPGA main chip will determine the status of the remote / near control switching knob. When the remote / near control switching knob is in the near control state (indicating that the monitor 7 is allowed to execute the control command), the FPGA main chip will convert the parsed control commands of multiple arc power supplies 4 into the command language of a single arc power supply 4 and send them to the corresponding arc power supply 4 respectively; if it is a correction command, the FPGA main chip will modify the internal parameters and save them, and then restart Step 3 according to the new parameters.
[0062] At this time, the FPGA main chip can still receive the request sent by the host computer 1 to control multiple arc power supplies 4 and parse the instructions, but no longer execute the control instructions of the host computer 1; the FPGA main chip can still respond to the instruction sent by the host computer 1 to read multiple arc power supplies 4.
[0063] Steps four and five can be performed simultaneously;
[0064] Step Six: When the arc power supply alarms due to overcurrent or overvoltage, the FPGA main chip integrates the alarm information and feeds it back to the host computer 1 and monitor 7 through the host computer communication module and the intermediate conversion box status monitoring module; the operator can then view the information through the display areas of the host computer 1 and monitor 7.
[0065] Step 7: When the arc power supply alarms due to overcurrent or overvoltage, the operator can also send a query command through the monitor 7. The FPGA main chip will return the working log of the intermediate conversion box 2, which the operator can then query from the monitoring interface of the monitor 7.
[0066] Step 8: When the environment in which the intermediate conversion box 2 is used changes, such as when the number of control arc power supplies changes or when the communication protocol between the intermediate conversion box 2 and the host computer 1 needs to be changed, the administrator can send a correction command through the monitor 7. After receiving the corresponding correction command, the FPGA main chip will perform the corresponding program correction.
[0067] The correction instructions include:
[0068] A. Correction of the number of arc power sources;
[0069] B. When intermediate converter box 2 communicates with host computer 1, the required communication address, baud rate, and stop parameters are specified.
[0070] Changes to communication information such as stop position and the amount of communication data;
[0071] C. Correction of the storage time of the working log in intermediate conversion box 2.
[0072] The remote / near control switching knob is used to control the multi-arc power supply control device to execute the instructions of the host computer 1 or the monitor 7.
[0073] The embodiments of the present invention have been described in detail above. The present invention is not limited to the above examples. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.
Claims
1. A multi-arc power supply control device in a vacuum arc coating system, characterized in that: Includes: host computer (1), intermediate conversion box (2), drive power supply (3), several arc power supplies (4), optical fiber A (5) and several optical fibers B (6), monitor (7) and cable (8); one end of the intermediate conversion box (2) is connected to the host computer (1) through optical fiber A (5), and the other end of the intermediate conversion box (2) is connected to several arc power supplies (4) through several optical fibers B (6). The intermediate conversion box (2) is also provided with a spare port. The spare port of the intermediate conversion box is connected to the monitor (7) through cable (8). The intermediate conversion box (2) is also connected to the drive power supply (3). The intermediate conversion box (2) includes an FPGA main chip, a host computer communication module, an arc power communication module, and an intermediate conversion box status monitoring module. The outer surface of the intermediate conversion box (2) is also provided with a remote / near control switching knob. The remote / near control switching knob is connected to the FPGA main chip in the intermediate conversion box through a data cable. The FPGA main chip is connected to the host computer communication module, the arc power communication module, and the intermediate conversion box status monitoring module, respectively. The FPGA main chip is connected to the host computer communication module and receives and parses the instructions issued by the host computer (1). If the instruction received and parsed by the FPGA main chip is a read instruction, the FPGA main chip responds directly. If the instruction received and parsed by the FPGA main chip is a control instruction and the remote control switching knob is in remote control mode, the FPGA main chip sends the parsed host computer (1) control instruction to multiple arc power communication modules at the same time. The arc power communication module is connected to several arc power sources (4) through several optical fibers B (6), and the FPGA main chip reads and controls multiple arc power sources (4) through the arc power communication module.
2. The multi-arc power supply control device in a vacuum arc coating system according to claim 1, characterized in that: The host computer communication module is connected to the host computer (1) via optical fiber A (5) and is used to receive host computer monitoring commands.
3. The multi-arc power supply control device in a vacuum arc coating system according to claim 2, characterized in that: The intermediate conversion box status monitoring module is connected to the monitor (7) via a cable and is used to receive monitoring instructions from the monitor (7).
4. The multi-arc power supply control device in a vacuum arc coating system according to claim 3, characterized in that: The FPGA main chip is connected to the intermediate conversion box status monitoring module. It receives and parses the instructions issued by the monitor (7). If the instruction received and parsed by the FPGA main chip is a read instruction, the FPGA main chip responds directly. If the instruction received and parsed by the FPGA main chip is a control instruction, and the remote control switching knob is in the near control position, the parsed control instruction of the monitor (7) is sent to the communication modules of multiple arc power supplies at the same time. If the instruction received and parsed by the FPGA main chip is a correction instruction, the parameters inside the conversion box are updated and saved. Then, according to the new parameters, the data exchange between the host computer, multiple arc power supplies and the monitor is restarted.
5. The multi-arc power supply control device in a vacuum arc coating system according to claim 4, characterized in that: Both the host computer communication module and the arc power supply communication module have bidirectional communication functions, that is, the information of multiple arc power supplies (4) is also transmitted back to the FPGA main chip through the arc power supply communication module, and the FPGA main chip is fed back to the host computer (1) through the host computer communication module.
6. The multi-arc power supply control device in a vacuum arc coating system according to claim 5, characterized in that: The intermediate conversion box status monitoring module and the arc power communication module both have bidirectional communication functions. That is, the information of multiple arc power sources (4) is also transmitted back to the FPGA main chip through the arc power communication module, and the FPGA main chip is fed back to the monitor (7) through the intermediate conversion box status monitoring module. The detection function of the multi-arc power source control device is not limited by the remote and near control switching knob.
7. The multi-arc power supply control device in a vacuum arc coating system according to claim 6, characterized in that: The driving power supply (3) is used to provide power to the intermediate conversion box and convert the input 220V AC power into 5V DC power.
8. A control method for a multi-arc power supply control device in a vacuum arc coating system according to any one of claims 1 to 7, characterized in that... Includes the following steps: Step 1: Connect the intermediate conversion box 2 to the host computer 1, the monitor 7, and the multiple arc power supplies 4 respectively; Step 2: Provide 220V power to the multi-arc power supply control device, and the multi-arc power supply control device will automatically turn on; Step 3: The FPGA main chip arc power communication module starts to read the current status and parameters of multiple arc power supplies (4) in a loop. The FPGA integrates the status and parameters of multiple arc power supplies and saves the data. Step 4: After receiving the instruction sent by the host computer (1), the FPGA main chip parses it. If it is a read instruction, that is, a request to read the status and data of multiple arc power sources (4), the FPGA main chip sends the integrated data in step 3 to the host computer (1) through the host computer communication module. If it is a control instruction, such as an arc power source run instruction or an arc power source write current instruction, the FPGA main chip will determine the status of the remote control switching knob. When the remote control switching knob is in the remote control state, the FPGA main chip will convert the parsed control instructions of multiple arc power sources (4) into the command language of a single arc power source (4) and send them to the corresponding arc power source (4) respectively. At this time, the FPGA main chip can still receive and parse the instructions sent by the monitor (7), but no longer execute the control instructions of the monitor (7); the FPGA main chip can still respond to the instructions sent by the monitor (7) to read multiple arc power supplies (4); the FPGA main chip can still respond to the correction instructions of the monitor (7); Step 5: When the FPGA main chip receives and parses the command sent by the monitor (7), if it is a read command, that is, a request to read the status and data of multiple arc power sources (4), the FPGA main chip will send the integrated data in step 3 to the monitor (7) through the host computer communication module; if it is a control command, such as an arc power source run command, an arc power source write current command, etc., the FPGA main chip will determine the status of the remote control switching knob. When the remote control switching knob is in the near control state, the control commands of the multiple arc power sources (4) after parsing will be converted into the command language of a single arc power source (4) and sent to the corresponding arc power source (4) respectively; if it is a correction command, the FPGA main chip will modify the internal parameters and save them, and then restart step 3 according to the new parameters. At this time, the FPGA main chip can still receive the request sent by the host computer (1) to control multiple arc power supplies (4) and parse the instructions, but no longer execute the control instructions of the host computer (1); the FPGA main chip can still respond to the instruction sent by the host computer (1) to read multiple arc power supplies (4); Steps four and five can be performed simultaneously; Step 6: When the arc power supply alarms due to overcurrent or overvoltage, the FPGA main chip integrates the alarm information and feeds it back to the host computer (1) and monitor (7) through the host computer communication module and the intermediate conversion box status monitoring module; the operator can then view the information through the display areas of the host computer (1) and monitor (7). Step 7: When the arc power supply alarms due to overcurrent or overvoltage, the operator can also send a query command through the monitor (7). The FPGA main chip will return the working log of the intermediate conversion box (2), so the operator can query it from the monitoring interface of the monitor (7). Step 8: When the environment in which the intermediate conversion box 2 is used changes, such as when the number of control arc power supplies changes or when the communication protocol between the intermediate conversion box 2 and the host computer 1 needs to be changed, the administrator can send a correction instruction through the monitor (7). After the FPGA main chip receives the corresponding correction instruction, it will perform the corresponding program correction. The correction instructions include: A. Correction of the number of arc power supplies; B. Changes in communication information such as the communication address, baud rate, stop bits, and number of communication data required when the intermediate conversion box (2) communicates with the host computer (1); C. Correction of working log storage time in intermediate conversion box (2).