JP2024055360A - Electronic device and welding device equipped with same - Google Patents

Abstract

[Problem] To provide an electronic device that can reliably prevent unauthorized access from another electronic device connected to a USB terminal. [Solution] A welding power source 10, which is an electronic device, is configured to be connectable to a USB memory 80, and includes at least an input unit 12, a display unit 16, a USB connection unit 17, and a USB control unit 14. When the USB memory 80 is connected to the USB connection unit 17, if the password input from the input unit 12 matches a predetermined password, the USB control unit 14 allows power supply to the USB connection unit 17 and allows access to the welding power source 10 from the USB memory 80. If the password does not match the predetermined password, the USB control unit 14 prohibits power supply to the USB connection unit 17, thereby prohibiting access to the welding power source 10 from the USB memory 80. [Selected Figure] Figure 2

Description

This disclosure relates to an electronic device and a welding device equipped with the same.

Conventionally, it has been common to connect a storage medium to a controller or server that stores control programs internally, and update or add control programs.

On the other hand, if the security of the storage medium is not guaranteed, there is a concern that the internal control programs of the controller, etc. may be rewritten or illegally obtained via the connected storage medium without permission, or that the controller or server may be infected with a computer virus.

To prevent this, for example, as disclosed in Patent Document 1, a configuration has been proposed in which, when a USB memory is inserted into a user terminal, the USB memory is checked and an access initiation request accompanied by the user ID and the serial number of the USB memory is sent to the server.

The server sends a one-time password to the registered email address, and when the user receives it and enters it on the user's terminal, the one-time password is sent to the server. When the user receives a one-time password verification response from the server, they are able to send a file operation request to the server to operate files stored on the server.

JP 2015-109008 A

As disclosed in Patent Document 1, a method has already been proposed for prohibiting access to electronic devices from storage media such as USB memory unless specific procedures are followed.

By the way, when a USB memory is connected as a storage medium to the connection terminal of an electronic device, the supply of power from the electronic device to the USB memory itself is usually not prohibited.

However, when power is supplied from an electronic device to a USB memory, this can be exploited to gain unauthorized access to the inside of the electronic device from the USB memory. Similarly, when another electronic device connected to a USB terminal is connected to the connection terminal of the electronic device, unauthorized access to the inside of the electronic device can also be exploited.

This disclosure has been made in light of these points, and its purpose is to provide an electronic device that can reliably prevent unauthorized access from another electronic device connected to the USB terminal, and a welding machine equipped with the electronic device.

In order to achieve the above object, the electronic device according to the present disclosure is an electronic device configured to be connectable to a USB terminal, and includes at least an input unit, a display unit, a USB connection unit for connecting the USB terminal, and a USB control unit for controlling the connection state between the USB terminal and the USB connection unit. When the USB terminal is connected to the USB connection unit, if a password input from the input unit matches a predetermined password, the USB control unit allows power supply to the USB connection unit and allows access to the electronic device from another electronic device connected via the USB terminal, and if the password does not match the predetermined password, prohibits power supply to the USB connection unit, thereby prohibiting access to the electronic device from the other electronic device connected via the USB terminal.

The welding device according to the present disclosure is characterized in that it comprises at least a welding power source and a welding head electrically connected to the welding power source, and the welding power source is the electronic device.

Another welding device according to the present disclosure is characterized in that it at least includes the electronic device, a welding power source configured to be able to send and receive data with the electronic device, and a welding head electrically connected to the welding power source, and the electronic device is a remote controller for the welding power source.

This disclosure makes it possible to reliably prevent unauthorized access from other electronic devices connected to the USB terminal.

1 is a schematic configuration diagram of a welding device according to an embodiment; FIG. 2 is a schematic diagram of a functional block of a welding power source. FIG. 2 is a schematic diagram showing the appearance of a control panel of a welding power source. 5 is a flowchart showing a procedure for accessing the welding power source from the USB memory. 13 is a schematic diagram showing the appearance of the operation panel when a password entry screen is displayed; FIG. 13 is a schematic diagram showing the appearance of the operation panel when transitioned to a maintenance mode. FIG.

Embodiments of the present disclosure will be described below with reference to the drawings. Note that the following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present disclosure, its applications, or its uses.

(Embodiment)
[Welding Equipment Configuration]
FIG. 1 is a schematic diagram of a welding device according to an embodiment of the present invention. The welding device 70 is an arc welding device having a welding power source 10, a remote controller 20, a wire feeder 30, and a welding torch (welding head) 50.

The welding power source 10 has a main circuit 11 that generates welding power. The main circuit 11 supplies welding power to a welding wire 60 held by a welding torch 50. The main circuit 11 has a transformer, a power switch, etc. (not shown), and in the example shown in this embodiment, the positive terminal is connected to the welding wire 60 via a wire feeder 30, and the negative terminal is connected to the base material W via a base material cable 41. The welding power source 10 further has multiple function blocks (see FIG. 2), which will be described later.

The remote controller 20 is configured to send and receive data between the welding power source 10 and the wire feeder 30, and is used when a welding operator performs arc welding at a location away from the welding power source 10. Typically, a welding operator holds and operates the remote controller 20 in his or her hand to control the operation of the welding power source 10 and the wire feeder 30. The remote controller 20 has multiple function blocks (see Figure 2), which will be described later.

In the example shown in FIG. 1, the remote controller 20 is connected to the welding power source 10 via the signal lines 31 and 32 and the wire feeder 30, but this is not limited to this example. For example, the welding cable 40 and the signal line 31 may be integrated, and the signal line 31 may branch off midway and be connected to the remote controller 20. Alternatively, the signal line 31 may be directly connected to the welding power source 10. Alternatively, the remote controller 20 and the welding power source 10 may be configured to be able to communicate with each other wirelessly. In that case, the signal lines 31 and 32 are omitted.

The wire feeder 30 feeds the welding wire 60 toward the base material W based on a wire feed command from the welding power source 10 or the remote controller 20. Note that the wire feeder 30 may also perform a so-called reverse feed operation, which feeds the welding wire 60 away from the base material W.

The welding cable 40 is a composite cable that integrates a welding wire 60 feed pipe (not shown) and a shielding gas supply pipe (not shown).

The welding torch 50 is manually operated by a welding operator, and the welding wire 60 held by the welding torch 50 is fed toward the base material W. A predetermined welding power is supplied to the welding wire 60, and the tip of the molten welding wire 60 moves to the base material W, and the welding progresses sequentially. Shielding gas is sprayed from the welding cable 40 onto the welding point.

In this embodiment, a so-called consumable electrode type arc welding device is described, in which the welding wire 60 is melted and transferred to the base material W, but the welding device 70 may be a non-consumable electrode type arc welding device. When the welding device 70 is a non-consumable electrode type arc welding device, the wire feeder 30 and the welding wire 60 are omitted.

[Welding power source configuration]
FIG. 2 is a schematic diagram showing the functional blocks of the welding power source, and FIG. 3 is a schematic diagram showing the external appearance of an operation panel of the welding power source.

As shown in FIG. 2, the welding power source 10 has, as functional blocks, an input unit 12, a control unit 13, a USB control unit 14, and a memory unit 15. The welding power source 10 also has a display unit 16, a USB connection unit 17, and a communication unit 18. However, the welding power source 10 may have functional blocks other than the functional blocks shown in FIG. 2. Also, some of the functional blocks shown in FIG. 2 may be omitted. For example, the input unit 12 and the display unit 16 may be integrated.

As shown in FIG. 3, the input unit 12 is composed of operation buttons 12a to 12c, jog dials 12d and 12e, and a start button 12f, and receives operation contents from a welding operator. For example, the welding operator can switch the display unit 16 to the initial screen by operating the operation button 12a.

Operation buttons 12b and 12c correspond to switching the welding condition adjustment target. For example, pressing operation button 12b makes it possible to adjust the welding current voltage at the start of welding, and pressing operation button 12c makes it possible to adjust the welding current voltage at the end of welding.

Press the operation button 12b and turn the jog dial 12d to change the welding current value when welding starts. Press the operation button 12b and turn the jog dial 12e to change the welding voltage value when welding starts.

By pressing the start button 12f, the internal circuit of the welding power source 10 is started. However, the number of operation buttons is not limited to that shown in FIG. 3. Furthermore, the association between the operation buttons 12a to 12c and the types of welding conditions and the operation method of the operation buttons 12a to 12c, etc. are not particularly limited to those shown here. Furthermore, the input unit 12 may have devices other than the operation buttons 12a to 12c, jog dials 12d, 12e, and start button 12f, such as an emergency stop button.

The items selected and values entered in the input unit 12 are configured to be displayed in real time on the display unit 16. This allows the welding operator to change the welding conditions while checking the input contents.

As will be described later, in this embodiment, the display unit 16 also functions as the input unit 12.

The control unit 13 is configured with a CPU (Central Processing Unit) or an MCU (Micro Controller Unit), or a combination of these. Note that the control unit 13 may be configured with multiple CPUs or MCUs, or a combination of these.

The control unit 13 reads out a welding program stored in advance in the memory unit 15 based on the input from the input unit 12, and controls the operation of the main circuit 11 according to the welding program. Furthermore, the control unit 13 changes the welding conditions and transmits wire feed commands to the wire feeder 30 based on the input from the input unit 12. These controls may also be performed based on the input from the input unit 22 of the remote controller 20.

The control unit 13 is also configured to be able to communicate with the USB control unit 14. As described later, when the USB control unit 14 allows power supply to the USB connection unit 17, the control unit 13 may be able to transmit a control signal to the main circuit 11 and the wire feeder 30 based on the result.

The USB control unit 14, like the control unit 13, is composed of one or more CPUs or MCUs. The USB control unit 14 may be a functional block within the control unit 13.

The USB control unit 14 controls the connection state between the USB connection unit 17 and the USB memory 80 connected to the USB connection unit 17. Specifically, the USB control unit 14 is configured to permit power supply to the USB connection unit 17 when a predetermined condition is satisfied, and to prohibit power supply to the USB connection unit 17 when the condition is not satisfied. These functions will be described in detail later.

The storage unit 15 is configured with a semiconductor memory, for example, a RAM (Random Access Memory) or an SSD (Solid State Drive). The storage unit 15 may be one functional block of the CPU or MCU constituting the control unit 13, that is, a RAM or a ROM (Read Only Memory) built into the CPU or MCU. The storage unit 15 stores a welding program and welding parameters for executing the program. The storage unit 15 also stores a password for transitioning the operation mode of the welding power source 10 to a maintenance mode. The storage unit 15 may also temporarily store the contents of an input from the remote controller 20.

The display unit 16 is composed of, for example, a liquid crystal display or a 7-segment LED, and as described above, visualizes and displays the welding conditions and the like being used by the welding power source 10. Also, by incorporating a touch panel or the like in the display unit 16, as described above, the display unit 16 functions as part of the input unit 12. For example, the password described above is entered from a keyboard screen displayed on the display unit 16 (see FIG. 5A). Also, the display unit 16 and the input unit 12 are arranged side by side on the operation panel 10A of the welding power source 10.

The USB connection unit 17 is a known USB port. In other words, the USB connection unit 17 is a terminal connection port to which the USB terminal 81 of the USB memory 80 that complies with the USB standard, for example, USB standard 2.0 or USB standard 3.1, is connected.

The communication unit 18 is configured to be able to communicate with the communication unit 28 of the remote controller 20 via signal lines 31 and 32. The communication unit 18 also transmits a control signal from the control unit 13 to the wire feeder 30 via signal line 31. Furthermore, the communication unit 18 receives input contents of the remote controller 20 via signal lines 31 and 32 and transmits them to the memory unit 15.

As described above, when wireless communication is performed between the welding power source 10 and the remote controller 20, an antenna (not shown) is provided on each of the welding power source 10 and the remote controller 20 instead of the signal lines 31, 32, and wireless communication is performed between the welding power source 10 and the remote controller 20 via the antenna. In this case, the wire feeder 30 is provided with an antenna and a communication unit (neither shown), and the wire feeder 30 operates according to the input contents from the welding power source 10 or the remote controller 20.

As shown in FIG. 2, the remote controller 20 has multiple function blocks, just like the welding power source 10. Function blocks with the same names in the remote controller 20 and the welding power source 10 have similar functions.

However, the memory unit 25 of the remote controller 20 temporarily stores the contents input from the input unit 22. It also temporarily stores the welding program and the values of the welding parameters transmitted from the welding power source 10. Based on the contents input from the input unit 22, the control unit 23 reads out the welding program previously stored in the memory unit 15 of the welding power source 10 or the welding program temporarily stored in the memory unit 25 of the remote controller 20, and controls the operation of the main circuit 11 and the wire feeder 30 according to the welding program.

The remote controller 20 is also provided with an internal power supply 29 for operation. The internal power supply 29 is composed of a battery such as a lithium ion battery, or a voltage converter such as a DC-DC converter that converts the voltage of a power supply (not shown) supplied via signal lines 31 and 32.

[Procedure for accessing the welding power source from a USB memory]
As described above, when USB memory 80 is connected to USB connection unit 17, there is a risk that control unit 13 and memory unit 15 of welding power source 10 may be illegally accessed from USB memory 80.

To prevent this, the inventors of the present application propose to prevent unauthorized access by the following procedure. This will be further explained using the drawings.

Figure 4 is a flowchart showing the procedure for accessing the welding power source from the USB memory. Figure 5A is a schematic diagram showing the appearance of the operation panel when the password entry screen is displayed. Figure 5B is a schematic diagram showing the appearance of the operation panel when the maintenance mode is displayed.

As shown in FIG. 4, first, the operator connects the USB terminal 81 of the USB memory 80 to the USB connection unit 17 (step S1), and presses the start button 12f to start the welding power source 10 (step S2). After step S2 is executed, the display unit 16 displays a message indicating that the welding power source 10 is starting up (start-up screen). Note that, at the end of step S2, the power supply to the USB connection unit 17 is stopped. Therefore, the order of execution of steps S1 and S2 may be reversed.

Next, the input unit 12 is operated to transition the display screen of the display unit 16 from the startup screen to a password entry screen (step S3). The operation method for transitioning to the password entry screen can be set appropriately. For example, the display screen of the display unit 16 may be transitioned to the password entry screen by simultaneously pressing multiple operation buttons 12a to 12c.

When the password entry screen appears, as shown in FIG. 5A, a keyboard screen appears on the display unit 16, and the worker enters a preset password by touching the corresponding key on the keyboard screen or by selecting it using the jog dials 12d and 12e (Figure S4).

The USB control unit 14 compares the password entered in step S4 with the password stored in the memory unit 15 and determines whether the two match (step S5).

If the judgment result in step S5 is positive, that is, if the password entered in step S4 matches the password stored in the memory unit 15, the USB control unit 14 transitions the operation mode of the welding power source 10 to the maintenance mode (step S6). Note that, in response to the judgment result in the USB control unit 14, the control unit 13 may transition the operation mode of the welding power source 10 to the maintenance mode.

Here, "maintenance mode" refers to an operation mode in which normal operation of the welding power source 10 is restricted, for example, output from the main circuit 11 is prohibited, while the operator can change the internal configuration of the welding power source 10 and the data stored in the memory unit 15. For example, it is possible to add data to the memory unit 15 and edit or delete stored data. Note that parameters in the welding program can be changed even in the normal operation mode.

When the mode is switched to maintenance mode, a message to that effect is displayed on the display screen of the display unit 16, as shown in FIG. 5B. In addition, the parameter values of the welding program used immediately before are displayed.

Furthermore, when the maintenance mode is entered, the USB control unit 14 allows power supply to the USB connection unit 17 (step S7). For example, inside the welding power source 10, a switch or relay (not shown) is arranged on a signal line (not shown) connected to the USB connection unit 17, and the switch or relay is operated in response to a signal from the USB control unit 14. As a result, the USB connection unit 17 is electrically connected to the internal circuit of the welding power source 10 via the signal line, and power is supplied to the USB connection unit 17.

Furthermore, after step S7 is executed, access from the USB memory 80 to the welding power source 10 is permitted (step S8), and data communication between the control unit 13 and the USB memory 80 and data transfer between the USB memory 80 and the storage unit 15 become possible. For example, when updating a welding program, an updated version of the welding program created externally is saved in the USB memory 80, and after steps S1 to S8, the updated version of the welding program is saved from the USB memory 80 to the storage unit 15.

After step S7 is completed, and before proceeding to step S8, a step of reconfirming the security of the USB memory 80 itself may be provided. For example, an identification code may be set for each USB memory 80, and after the password is entered in step S7, the user may be prompted to enter the set identification code.

On the other hand, if the determination result in step S5 is negative, that is, if the password entered in step S4 does not match the password stored in the memory unit 15, the operator is notified of this, and the control unit 13 counts the number of times the password is entered and temporarily stores the counted number in the memory unit 15. The control unit 13 also determines whether the number of times the password is entered is within a preset number of times (=N) (step S9). If the determination result in step S9 is positive, that is, if the number of times the password is entered is within the predetermined number of times N, the operator returns to step S4, enters the password again, and proceeds to step S5. The number of times N is set to, for example, 3 times. However, it is not limited to this, and the number of times N can be set appropriately by the operator.

On the other hand, if the result of the determination in step S9 is negative, that is, if the number of times the password has been entered exceeds the predetermined number N, the USB control unit 14 prohibits the supply of power to the USB connection unit 17 (step S10). The USB control unit 14 operates the switch or relay described above to cut off the electrical connection between the USB connection unit 17 and the internal circuitry of the welding power source 10. As a result, the supply of power to the USB connection unit 17 is prohibited.

When step S10 is executed, access from the USB memory 80 to the welding power source 10 is automatically prohibited (step S11). In other words, data communication between the control unit 13 and the USB memory 80, and data transfer between the USB memory 80 and the storage unit 15, etc. are disabled.

If you want to connect the USB memory 80 to the welding power source 10 again from the state of step S11, for example, remove the USB memory 80 from the USB connection unit 17, restart the welding power source 10, and then re-execute each step shown in Figure 4.

[Effects, etc.]
As described above, the welding power supply 10 according to this embodiment is configured to be connectable to the USB memory 80 .

The welding power source 10 also includes at least an input unit 12, a display unit 16, a USB connection unit 17 for connecting a USB memory 80, and a USB control unit 14 for controlling the connection state between the USB memory 80 and the USB connection unit 17.

When the USB memory 80 is connected to the USB connection unit 17, the USB control unit 14 allows power supply to the USB connection unit 17 if the password entered from the input unit 12 matches a predetermined password. Furthermore, the USB control unit 14 allows access from the USB memory 80 to the welding power source 10, specifically, to the internal circuitry of the welding power source 10.

On the other hand, if the password does not match the specified password, the USB control unit 14 prohibits the supply of power to the USB connection unit 17, thereby prohibiting access from the USB memory 80 to the welding power source 10.

According to this embodiment, even if a USB memory 80 is connected to the USB connection unit 17, power supply to the USB connection unit 17 is not permitted unless the password matches a specified password. This reliably prevents unauthorized access from the USB memory 80 to the internal circuitry of the welding power source 10.

When using the method disclosed in Patent Document 1, the USB memory is checked and an access initiation request including the user ID and the serial number of the USB memory is sent to the server.

However, as shown in this embodiment, although there is a case where a remote controller 20 is connected to a welding power source 10, they are not necessarily connected to a server. In other words, the method disclosed in Patent Document 1 cannot be applied to the welding power source 10 in the welding device 70 shown in this embodiment.
On the other hand, according to this embodiment, unauthorized access from USB memory 80 to welding power source 10 can be simply and reliably prevented without going through a server.

In addition, the welding power source 10 further includes a memory unit 15, and when access to the welding power source 10 from the USB memory 80 is permitted, data can be transferred between the USB memory 80 and the memory unit 15 via the USB connection unit 17.

In this way, data stored in the memory unit 15, in this embodiment, the welding program and each parameter, can be reliably protected.

When a password is input from the input unit 12 multiple times, if the password matches a predetermined password within a predetermined number of times N, the USB control unit 14 allows power supply to the USB connection unit 17. Furthermore, the USB control unit 14 allows access from the USB memory 80 to the welding power source 10.

On the other hand, if the password does not match the specified password within the N number of times, the USB control unit 14 prohibits the supply of power to the USB connection unit 17, thereby prohibiting access from the USB memory 80 to the welding power source 10.

In this way, even if the worker makes a mistake when entering a password, data can be transferred between the USB memory 80 and the storage unit 15 without interruption. On the other hand, if the number of times the password is entered exceeds the number N, there is a possibility of unauthorized access, so the USB control unit 14 prohibits the supply of power to the USB connection unit 17. This can reliably prevent unauthorized access from the USB memory 80 to the welding power source 10.

The welding device 70 according to this embodiment includes at least a welding power source 10 and a welding torch (welding head) 50 electrically connected to the welding power source 10.

This embodiment prevents unauthorized modification of welding programs and the parameter values used therein, ensuring the safety of welding work.

Other Embodiments
As described above, the remote controller 20 has the same functional blocks as the welding power source 10. Therefore, the remote controller 20 also has the same functions as the welding power source 10. In other words, only when the above-mentioned conditions are satisfied, the USB control unit 24 of the remote controller 20 permits the supply of power to the USB connection unit 27 and permits access to the remote controller 20 from the USB memory 80. When the above-mentioned conditions are not satisfied, the USB control unit 24 of the remote controller 20 prohibits the supply of power to the USB connection unit 27, thereby prohibiting access to the remote controller 20 from the USB memory 80.

In addition, for example, when a storage medium or electronic device other than the USB memory 80 (hereinafter, including the storage medium described above, referred to as another electronic device) is connected to the USB connection unit 17 or the USB connection unit 27 via a USB cable (not shown), access from the USB memory 80 to the electronic device may be managed using the procedure shown in FIG. 4.

In other words, if the password entered from the input unit 12 or the input unit 22 matches a predetermined password, power supply to the USB connection unit 17 or the USB connection unit 27 is permitted. Furthermore, the USB control unit 14 or the USB control unit 24 permits access to the welding power source 10 or the remote controller 20 from another electronic device.

On the other hand, if the password does not match the specified password, the USB control unit 14 or the USB control unit 24 prohibits the supply of power to the USB connection unit 17 or the USB connection unit 27, thereby prohibiting access to the welding power source 10 from another electronic device.

In addition, although the present specification has been described using the welding device 70 as an example, an electronic device that can be connected to a USB terminal may have the functional blocks shown in FIG. 2, and access to the electronic device may be managed according to the procedure shown in FIG. 4.

In other words, this specification discloses an electronic device with the following configuration:

The electronic device disclosed herein is configured to be connectable to a USB terminal.

The electronic device also includes at least an input unit, a display unit, a USB connection unit for connecting the USB terminal, and a USB control unit for controlling the connection state between the USB terminal and the USB connection unit.

When a USB terminal is connected to the USB connection unit, the USB control unit allows power supply to the USB connection unit if the password entered from the input unit matches a predetermined password. Furthermore, the USB control unit allows access to the electronic device of the present disclosure from another electronic device connected via the USB terminal.

On the other hand, if the password does not match the specified password, the USB control unit prohibits the supply of power to the USB connection unit, thereby prohibiting access to the electronic device of the present disclosure from another electronic device connected via the USB terminal.

The electronic device also includes a memory unit.

When access to the electronic device of the present disclosure is permitted from another electronic device connected via the USB terminal, data can be transferred between the other electronic device connected via the USB terminal and the memory unit via the USB connection unit.

When a password is input multiple times from the input unit, if the password matches a predetermined password within a predetermined number of times N, the USB control unit permits power supply to the USB connection unit and permits access to the electronic device of the present disclosure from another electronic device connected via the USB terminal.

On the other hand, if the password does not match the specified password within a specified number of times N, power supply to the USB connection section is prohibited, thereby prohibiting access to the electronic device of the present disclosure from another electronic device connected via the USB terminal.

The electronic device disclosed herein is useful because it can reliably prevent unauthorized access from other electronic devices connected via a USB terminal.

10 Welding power source (electronic device)
10A Operation panel 11 Main circuit 12 Input section 12a to 12c Operation buttons 12d, 12e Jog dial 12f Start button 13 Control section 14 USB control section 15 Memory section 16 Display section 17 USB connection section 18 Communication section 20 Remote controller (electronic device)
22 Input unit 23 Control unit 24 USB control unit 25 Memory unit 26 Display unit 27 USB connection unit 28 Communication unit 29 Internal power source 30 Wire feeder 31, 32 Signal line 40 Welding cable 41 Base metal cable 50 Welding torch (welding head)
60 welding wire 70 welding device 80 USB memory 81 USB terminal W base material

Claims (5)

An electronic device configured to be connectable to a USB terminal,
An input unit;
A display unit;
a USB connection portion for connecting the USB terminal;
a USB control unit that controls a connection state between the USB terminal and the USB connection unit,
When the USB terminal is connected to the USB connection portion,
The USB control unit includes:
when the password input from the input unit matches a predetermined password, permitting power supply to the USB connection unit and permitting access to the electronic device from another electronic device connected via the USB terminal;
An electronic device characterized in that, if the password does not match the specified password, the supply of power to the USB connection portion is prohibited, thereby prohibiting access to the electronic device from the other electronic device connected via the USB terminal. 2. The electronic device according to claim 1,
Further comprising a storage unit,
When the access to the electronic device from the other electronic device connected via the USB terminal is permitted,
An electronic device, characterized in that data can be exchanged between the storage unit and the other electronic device connected via the USB terminal via the USB connection unit. 2. The electronic device according to claim 1,
When the password is input multiple times from the input unit,
The USB control unit includes:
if the password matches the predetermined password within a predetermined number of times, permitting power supply to the USB connection unit and permitting access to the electronic device from the other electronic device connected via the USB terminal;
An electronic device characterized in that if the password does not match the specified password within the specified number of times, power supply to the USB connection section is prohibited, thereby prohibiting access to the electronic device from the other electronic device connected via the USB terminal. A welding power source;
A welding head electrically connected to the welding power source,
4. A welding device, wherein the welding power source is an electronic device as claimed in claim 1. An electronic device according to any one of claims 1 to 3;
a welding power source configured to be capable of transmitting and receiving data to and from the electronic device;
A welding head electrically connected to the welding power source,
The welding device according to the present invention, wherein the electronic device is a remote controller for the welding power source.