3D printer USB drag chain line protection circuit
By setting up the protection circuit of the MOS tube and the electrostatic discharge diode at the USB interface of the 3D printer, the problem of data line damage caused by the ground line floating is solved, and data communication is safe and low-cost implementation is achieved.
Patent Information
- Application Number
- CN202421019311.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-11
AI Technical Summary
During the printing process of 3D printers, the USB drag chain line is easily pulled up to +24V due to the ground line floating, which damages the data channel circuit of the USB interface. The existing technology is difficult to effectively solve this problem.
Design a USB drag link protection circuit, and use MOS tube to protect it at the USB interface. The MOS tube is cut off when the local line is floating to prevent the data line level from being damaged, and electrostatic protection is carried out through the electrostatic discharge diode to ensure data communication. Perform normally.
Effectively prevent damage to the USB interface, ensure normal data communication, simple circuit structure, low cost, and easy to use.
Smart Images
Figure CN222262150U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of 3D printers, and in particular relates to a 3D printer USB drag chain line protection circuit. Background Art
[0002] 3D printing is the product of the development of modern science and technology. At the end of the 19th century, the United States developed photographic sculpture and landform forming technology, and then the core manufacturing idea of 3D printing technology was born.
[0003] In the late 1980s, American scientists invented a printer that can print three-dimensional effects and successfully launched it on the market. 3D printing technology has matured and is widely used. 3D printers not only reduce the cost of three-dimensional objects, but also stimulate people's imagination.
[0004] A 3D printer, also known as a three-dimensional printer, is a machine using cumulative manufacturing technology, that is, rapid prototyping technology. It is based on a digital model file and uses special wax materials, powdered metals, or plastics and other adhesive materials to print layers of adhesive materials to create three-dimensional objects.
[0005] For example, patent application 202311289261.5 discloses a 3D printer for industrial design. In order to solve the problem that during the printing process of the 3D printer, a fixed plate is usually installed inside the machine body, and the product will be formed on the fixed plate. The fixed plate is inconvenient to level. When the fixed plate is tilted, it will affect the molding of the printed product, resulting in printing failure and poor practicality. By turning on the motor, the threaded rod can be driven to rotate, and the rotating rod can be rotated through the meshing connection of the conical tooth B and the conical tooth A, and the threaded barrel can be moved upward. Under the action of the connecting part and the connecting block, the fixed plate can be pushed to move upward. At this time, the limit rod slides in the perforation, which can limit the angle between the connecting part and the connecting block, thereby playing a role in leveling the fixed plate. The printing platform is embedded in the fixed plate to achieve the purpose of leveling the printing platform, which is convenient for 3D printing.
[0006] In a 3D printer, the control circuit is the main component, which realizes the process control and precision control of 3D printing.
[0007] Among them, the drag chain cable refers to the cable connected to the USB interface. When the user plugs or unplugs the cable while it is powered on or the GND (ground wire) is broken, the ground wire becomes floating and the levels of the data lines USB_D+ and USB_D- are pulled up to +24V, which can easily damage the data channel circuit of the USB interface, so it is urgently needed to be improved. Utility Model Content
[0008] In order to solve the above problems, the primary purpose of the utility model is to provide a 3D printer USB drag chain line protection circuit, which is arranged between the signal input port and the signal output port to protect the data channel circuit of the USB interface of the 3D printer and avoid damage to the data interface.
[0009] Another purpose of the utility model is to provide a 3D printer USB drag chain line protection circuit, which protects the USB interface through a MOS tube. When the local line is floating, the levels of the USB data lines D+ and D- are pulled up to +24V, and the MOS tube is cut off, so the USB interface will not be damaged through the USB data line. The circuit has a simple structure, is easy to implement, has low cost, and is easy to use.
[0010] To achieve the above-mentioned purpose, the technical solution of the utility model is as follows.
[0011] A 3D printer USB drag chain line protection circuit, the protection circuit is connected between the signal input port and the signal output port of the USB drag chain line, and comprises a MOS tube and an interface terminal, wherein the MOS tube controls the input signal through the interface terminal; when the level is pulled up to +24V, the MOS tube is cut off and the USB interface will not be damaged; when the USB+5V has a voltage to the ground line, the MOS tube is turned on, and normal USB data communication can be performed at this time.
[0012] Furthermore, the protection circuit also includes an ESD, which is an electrostatic discharge diode connected to the interface terminal to provide electrostatic protection for the interface terminal.
[0013] Furthermore, the interface terminal is a 6PIN terminal, the 6PIN terminal (P4) is a signal input port, and the existing TYPE-C terminal is a signal output port. When the GND (ground wire) in the 6PIN terminal is floating, the levels of the USB data lines D+ and D- are pulled up to +24V, and the USB+5V has no voltage on the GND (ground wire). At this time, the MOS tube Q1 is cut off, so the USB interface will not be damaged through the USB data line; when the GND (ground wire) is well connected, the USB+5V has voltage on the GND (ground wire), and the MOS tube Q1 is turned on, and normal USB data communication can be carried out at this time.
[0014] Furthermore, the MOS tube is a NTJD4001N field effect tube having two N-channel drain-source structures, a drain-source voltage of 20V, a continuous drain current of 2.6A, and an on-resistance of only 86mΩ at 4.5V and 2.6A.
[0015] Furthermore, there are two MOS tubes, which are respectively arranged on both sides of the signal input port 6PIN terminal, one is Q1A and the other is Q1B. Q1A is connected between the 6PIN terminal and D+, and Q1B is connected between the 6PIN terminal and D-.
[0016] Compared with the prior art, the technical effects of the utility model are as follows:
[0017] The protection circuit implemented by the utility model is arranged between the signal input port and the signal output port, and protects the data channel circuit of the USB interface of the 3D printer to avoid damage to the data interface.
[0018] Furthermore, the protection circuit protects the USB interface through the MOS tube. When the local line becomes floating, the levels of the USB data lines D+ and D- are pulled up to +24V, and the MOS tube is cut off, so the USB interface will not be damaged through the USB data line. The circuit has a simple structure, is easy to implement, has low cost, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a circuit diagram implemented by the utility model. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0021] Attached Figure 1 As shown, it is a circuit diagram of the 3D printer USB drag chain line protection circuit implemented by the utility model. The protection circuit is suitable for a hub board with an interface of XT30PW (2+2) terminal and USB bus communication. The four lines of the XT30PW (2+2) interface are defined as +24V, GND, USB_D+, USB_D-:.
[0022] As shown in the figure, the protection circuit is connected between D+ and D- of the USB drag chain line, and includes a MOS tube and an interface terminal, wherein the MOS tube is Q1 and the interface terminal is a 6PIN terminal. The MOS tube controls the input signal through the interface terminal; when the level is pulled up to +24V, the MOS tube is cut off and will not damage the USB interface; when the USB+5V has a voltage to the ground line, the MOS tube is turned on, and normal USB data communication can be carried out at this time.
[0023] In the figure, U1 is an electrostatic discharge diode ESD, D1 is two protection diodes, P2 is a USB connector TYPE-C-31-M-12 female socket, so it is marked as USB-C-31-M-12, and P4 is a 6PIN terminal; among them, D1 is grounded through C1 and R3.
[0024] Among them, the 6PIN terminal is P4, which is the signal input port, and the existing TYPE-C terminal is P2, which is the signal output port. MOS tube Q1 is a NTJD4001N field effect tube with two N-channel drain-source structures, a drain-source voltage (Vdss) of 20V, a continuous drain current (Id) of 2.6A, and an on-resistance of only 86mΩ at 4.5V and 2.6A.
[0025] More specifically, there are two Q1s, which are respectively arranged on both sides of the signal input port 6PIN terminal P4, one is Q1A and the other is Q1B. Q1A is connected between the 6PIN terminal P4 and D+, and Q1B is connected between the 6PIN terminal P4 and D-.
[0026] At the same time, Q1A is also connected to a resistor R1, Q1B is connected to a resistor R2, and both R1 and R2 are connected to the USB+5V voltage.
[0027] At the Q1A end, USB+5V is also connected to the ground wire through capacitor C2 for protection.
[0028] The circuit also includes an ESD, which is an electrostatic discharge diode U1, which is connected to the 6PIN terminal P4 to provide electrostatic protection for the 6PIN terminal P4.
[0029] ESD plus these two protection diodes D1 can prevent the pin from receiving excessively high or low voltage input from the outside. When the pin voltage is higher than +24V, the upper diode will conduct to absorb the high voltage. When the pin voltage is lower than a certain value, the lower diode will conduct to prevent abnormal voltage from being introduced and burning the USB interface.
[0030] In other implementations, the protection circuit may further include a fuse (F1), and the fuse (F1) is configured to limit the load power to <150W.
[0031] When the GND (ground wire) in the 6PIN terminal (P4) is floating, the levels of the USB data lines D+ and D- are pulled up to +24V, and USB+5V has no voltage on GND (ground wire). At this time, the MOS tube Q1 is cut off, so the USB interface will not be damaged through the USB data line; when the GND (ground wire) is well connected, USB+5V has voltage on GND (ground wire), and the MOS tube Q1 is turned on, and USB data communication can be carried out normally.
[0032] In summary, the utility model protects the USB interface through the MOS tube. When the ground line becomes floating, the levels of the USB data lines D+ and D- are pulled up to +24V, and the MOS tube is cut off, so the USB interface will not be damaged through the USB data line. The circuit structure is simple, easy to implement, low cost, and easy to use.
[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A 3D printer USB drag chain line protection circuit, characterized in that The protection circuit is connected between the signal input port and the signal output port of the USB drag chain line, and includes a MOS tube and an interface terminal, wherein the MOS tube controls the input signal through the interface terminal; when the level is pulled up to +24V, the MOS tube is cut off and will not damage the USB interface; when the USB+5V has a voltage to the ground line, the MOS tube is turned on, and normal USB data communication can be carried out at this time.
2. The 3D printer USB drag chain line protection circuit as claimed in claim 1, characterized in that The protection circuit also includes an ESD, which is an electrostatic discharge diode connected to the interface terminal.
3. The 3D printer USB drag chain line protection circuit as claimed in claim 2, characterized in that The interface terminal is a 6PIN terminal, the 6PIN terminal is a signal input port, and the TYPE-C terminal is a signal output port.
4. The 3D printer USB drag chain line protection circuit as claimed in claim 1, characterized in that The MOS tube is a NTJD4001N field effect tube having two N-channel drain-source structures, a drain-source voltage of 20V, a continuous drain current of 2.6A, and an on-resistance of only 86mΩ at 4.5V and 2.6A.
5. The 3D printer USB drag chain line protection circuit as claimed in claim 4, characterized in that There are two MOS tubes, which are respectively arranged on both sides of the signal input port 6PIN terminal, one is Q1A and the other is Q1B. Q1A is connected between the 6PIN terminal and the USB data line D+, and Q1B is connected between the 6PIN terminal and the USB data line D-.