CN219843434U - Electrically isolated Ethernet interface circuit - Google Patents
Electrically isolated Ethernet interface circuit Download PDFInfo
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- CN219843434U CN219843434U CN202320971195.9U CN202320971195U CN219843434U CN 219843434 U CN219843434 U CN 219843434U CN 202320971195 U CN202320971195 U CN 202320971195U CN 219843434 U CN219843434 U CN 219843434U
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- 230000009466 transformation Effects 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims description 50
- 230000005611 electricity Effects 0.000 abstract description 14
- 230000003068 static effect Effects 0.000 abstract description 12
- 238000002955 isolation Methods 0.000 abstract description 4
- 208000025274 Lightning injury Diseases 0.000 abstract description 3
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of electrical isolation circuits, in particular to an electrical isolation Ethernet interface circuit. The circuit comprises: the device comprises an Ethernet control module, a voltage transformation module, an Ethernet interface module, a first protection module and a second protection module; the first end of the transformation module is electrically connected with the Ethernet interface module, and the third end of the transformation module is electrically connected with the first end of the second protection module; the first protection module is electrically connected with the Ethernet control module; the second end of the second protection module is electrically connected to the Ethernet interface module, and the third end of the second protection module is grounded. The utility model can ensure the stable communication between the Ethernet interface circuit and the upper computer and simultaneously avoid the damage of the Ethernet controller chip caused by external overvoltage when the accidents such as lightning stroke or human static electricity occur.
Description
Technical Field
The utility model relates to the technical field of electrical isolation circuits, in particular to an electrical isolation Ethernet interface circuit.
Background
In the application of industrial controllers with a single-chip microcomputer as a core, it is required to provide a standard ethernet interface for communication with an upper computer. And is therefore typically implemented by adding an ethernet controller.
However, due to the complex industrial field environment, when accidents such as lightning stroke or static electricity of a human body occur, external overvoltage can be caused to enter the controller through the Ethernet interface, so that an Ethernet controller chip and even the whole controller are damaged. Therefore, how to prevent the ethernet controller chip from being damaged by external overvoltage when lightning strike or static electricity of human body occurs while ensuring stable communication between the ethernet interface circuit and the upper computer becomes a problem to be solved.
Accordingly, the inventors consider a need for an electrically isolated ethernet interface circuit.
Disclosure of Invention
The utility model provides an electrically isolated Ethernet interface circuit, which can ensure stable communication between the Ethernet interface circuit and an upper computer and simultaneously avoid the damage of an Ethernet controller chip by external overvoltage when accidents such as lightning stroke or human static electricity occur.
The utility model provides an electrically isolated Ethernet interface circuit, comprising: the device comprises an Ethernet control module, a voltage transformation module, an Ethernet interface module, a first protection module and a second protection module; the first end of the transformation module is the Ethernet control module, the second end of the transformation module is electrically connected with the Ethernet interface module, and the third end of the transformation module is electrically connected with the first end of the second protection module; the first protection module is electrically connected with the Ethernet control module; the second end of the second protection module is electrically connected to the Ethernet interface module, and the third end of the second protection module is grounded.
By adopting the technical scheme, the transformation module can effectively inhibit common mode and differential mode noise signals, so that the external overvoltage is reduced to a safe voltage range; the second protection module can effectively inhibit instantaneous overvoltage generated when accidents such as lightning strike or human static electricity occur. Through being connected to Ethernet control module with vary voltage module and first protection module electricity to be connected to Ethernet interface module through the second protection module electricity, can provide multiple protection means when the unexpected circumstances such as thunderbolt or human static take place, thereby guarantee effectively that Ethernet control module and external voltage signal are electric to be kept apart, avoid Ethernet control module to cause the damage.
Optionally, the ethernet control module is an ethernet control chip.
Optionally, the circuit further comprises a first power supply; the first protection module is a protection chip; the first pin of the protection chip is electrically connected with the RD-end of the Ethernet control chip; the second pin of the protection chip is electrically connected to the first power supply; the third pin of the protection chip is electrically connected to the RD+ end of the Ethernet control chip; the fourth pin of the protection chip is electrically connected with the TD-end of the Ethernet control chip; the fifth pin of the protection chip is electrically connected to the TD+ end of the Ethernet control chip; and the sixth pin of the protection chip is grounded.
Through adopting above-mentioned technical scheme, through adopting this kind of electricity connected mode, can make when unexpected circumstances such as thunderbolt or human static take place, the outside overvoltage that produces is input to ethernet control chip and is reduced to safe voltage within range effectively to avoid causing the damage to ethernet control chip.
Optionally, the circuit further comprises a first resistor R1, a first capacitor C1 and a second capacitor C2; the transformation module comprises a first transformer T1, a second transformer T2, a third transformer T3 and a fourth transformer T4; the first end of the first transformer T1 is electrically connected to the TD+ end of the Ethernet control chip; the second end of the first transformer T1 is electrically connected to the first end of the first resistor R1 and the first end of the first capacitor C1; the third end of the first transformer T1 is electrically connected with the TD-end of the Ethernet control chip; the first end of the second transformer T2 is electrically connected to the RD+ end of the Ethernet control chip; the second end of the second transformer T2 is electrically connected to the first end of the second capacitor C2; the third end of the second transformer T2 is electrically connected with the RD-end of the Ethernet control chip; the first end of the third transformer T3 is electrically connected to the Ethernet interface module; the second end of the third transformer T3 is electrically connected to the Ethernet interface module; the first end of the fourth transformer T4 is electrically connected to the Ethernet interface module; the second end of the fourth transformer T4 is electrically connected to the ethernet interface module.
Through adopting above-mentioned technical scheme, through adopting this kind of electricity connected mode, can make when unexpected circumstances such as thunderbolt or human static take place, effectively restrain common mode and differential mode noise signal through the vary voltage module, reduce the outside overvoltage that will produce to safe voltage within range to avoid causing the damage to ethernet control chip.
Optionally, the second protection module includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a third capacitor C3; a first end of the second resistor R2 is electrically connected to a fourth end of the second transformer T2, and a second end of the second resistor R2 is electrically connected to a first end of the third capacitor C3; a first end of the third resistor R3 is electrically connected to a fourth end of the first transformer T1, and a second end of the third resistor R3 is electrically connected to a first end of the third capacitor C3; a first end of the fourth resistor R4 is electrically connected to the ethernet interface module, and a second end of the fourth resistor R4 is electrically connected to a first end of the third capacitor C3; a first end of the fifth resistor R5 is electrically connected to the ethernet interface module, and a second end of the fifth resistor R5 is electrically connected to the first end of the third capacitor C3; the second end of the third capacitor C3 is grounded.
Through adopting above-mentioned technical scheme, through adopting this kind of electricity connected mode, can make when unexpected circumstances such as thunderbolt or human static take place, the outside overvoltage of production is conducted to ground to avoid causing the damage to ethernet control chip.
Optionally, the first capacitor C1 and the second capacitor C2 are preferably ceramic chip capacitors.
Optionally, the third capacitor C3 is preferably a high voltage tile capacitor.
Optionally, the ethernet interface module is preferably an eight-pin ethernet interface.
In summary, one or more technical solutions provided in the embodiments of the present utility model at least have the following technical effects or advantages:
the transformation module can effectively inhibit common mode and differential mode noise signals, so that the external overvoltage is reduced to a safe voltage range; the second protection module can effectively inhibit instantaneous overvoltage generated when accidents such as lightning strike or human static electricity occur. Through being connected to Ethernet control module with vary voltage module and first protection module electricity to be connected to Ethernet interface module through the second protection module electricity, can provide multiple protection means when the unexpected circumstances such as thunderbolt or human static take place, thereby guarantee effectively that Ethernet control module and external voltage signal are electric to be kept apart, avoid Ethernet control module to cause the damage.
Drawings
FIG. 1 is a schematic block diagram of an electrically isolated Ethernet interface circuit according to an embodiment of the utility model;
fig. 2 is a schematic circuit diagram of an electrically isolated ethernet interface circuit according to an embodiment of the present utility model.
Reference numerals illustrate: 1. an Ethernet control module; 2. a transformation module; 3. an Ethernet interface module; 4. a first protection module; 5. and a second protection module.
Detailed Description
In order that those skilled in the art will better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments.
In describing embodiments of the present utility model, words such as "for example" or "for example" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "such as" or "for example" in embodiments of the utility model should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "or" for example "is intended to present related concepts in a concrete fashion.
In the description of embodiments of the utility model, the term "plurality" means two or more. For example, a plurality of systems means two or more systems, and a plurality of screen terminals means two or more screen terminals. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating an indicated technical feature. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "electrically connected," "electrically connected," or "electrically connected for communication" should be construed broadly, for example, "electrically connected," "electrically connected," or "electrically connected for communication" may mean not only physically electrically connected but also electrically connected or electrically connected for signals, for example, may be directly electrically connected, i.e., physically electrically connected, or may be indirectly electrically connected through at least one element in between, so long as electrical communication is achieved, or may be internal to two elements; signal electrical connection may refer to signal electrical connection through a medium, such as radio waves, in addition to signal electrical connection through a circuit. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, a schematic block diagram of an electrically isolated ethernet interface circuit according to an embodiment of the present utility model is shown. Wherein the circuit comprises: the device comprises an Ethernet control module 1, a transformation module 2, an Ethernet interface module 3, a first protection module 4 and a second protection module 5; the first end of the transformation module 2 is electrically connected with the Ethernet control module 1, the second end of the transformation module 2 is electrically connected with the Ethernet interface module 3, and the third end of the transformation module 2 is electrically connected with the first end of the second protection module 5; the first protection module 4 is electrically connected to the ethernet control module 1; the second end of the second protection module 5 is electrically connected to the ethernet interface module 3, and the third end of the second protection module 5 is grounded.
In one possible embodiment, the ethernet control module 1 is an ethernet control chip.
Specifically, in the technical scheme, the ethernet control module 1 is an ethernet control chip, the preferred model of which is ENC624J600, and ENC624J600 has the characteristics of optimizing adaptive performance, low power consumption, high reliability, network security function and the like, and the use of ENC624J600 can simplify the system design, reduce the cost, and improve the system performance and reliability. The transformer module 2 is a transformer, preferably of the type H1199NL, and is internally composed of four transformers. The ethernet interface module 3 is preferably a standard RJ-45 ethernet interface, which is an eight pin ethernet interface, each pin having specific functions such as transmitting and receiving data, providing power, etc. The first protection module 4 is a protection chip, preferably model TPD4E001, TPD4E001 is a four-channel transient voltage suppression diode array, intended to protect sensitive electronic devices from voltage transients, and TPD4E001 may protect against electrostatic discharge (ESD) events up to ±15kV (air gap discharge) and ±8kV (contact discharge), and other voltage transients that may damage electronic components. Its low capacitance per channel is 0.5pF, helping to minimize signal distortion. The second protection module 5 is described in detail in the following embodiments.
In one possible implementation, referring to fig. 2, a schematic circuit diagram of an electrically isolated ethernet interface circuit provided by an embodiment of the present utility model is shown. The circuit further includes a first power supply; the first protection module 4 is a protection chip; the first pin of the protection chip is electrically connected with the RD-end of the Ethernet control chip; the second pin of the protection chip is electrically connected to the first power supply; the third pin of the protection chip is electrically connected with the RD+ end of the Ethernet control chip; the fourth pin of the protection chip is electrically connected with the TD-end of the Ethernet control chip; the fifth pin of the protection chip is electrically connected with the TD+ end of the Ethernet control chip; the sixth pin of the protection chip is grounded.
Specifically, RD-end is the signal-receiving end; the RD+ end is the signal receiving end; the TD-end is the signaling-end; the td+ side is the signaling+ side. In this embodiment, the preferred value of the voltage of the first power supply is 3.3V. Referring to fig. 2, a first pin of the protection chip TPD4E001 is electrically connected to the RD-terminal of the ethernet control chip ENC624J 600; the third pin of the protection chip TPD4E001 is electrically connected to the RD+ end of the Ethernet control chip ENC624J 600; the fourth pin of the protection chip TPD4E001 is electrically connected to the TD-end of the Ethernet control chip ENC624J 600; the fifth pin of the protection chip TPD4E001 is electrically connected to the TD+ end of the Ethernet control chip ENC624J 600; the first pin of the protection chip TPD4E001 is electrically connected with the signal receiving end of the Ethernet control chip ENC624J 600; the second pin of the protection chip TPD4E001 is electrically connected to a 3.3V power supply; the sixth pin of the protection chip TPD4E001 is grounded.
In one possible implementation, referring to fig. 2, the circuit further includes a first resistor R1, a first capacitor C1, and a second capacitor C2; the transformation module 2 comprises a first transformer T1, a second transformer T2, a third transformer T3 and a fourth transformer T4; the first end of the first transformer T1 is electrically connected to the TD+ end of the Ethernet control chip; the second end of the first transformer T1 is electrically connected to the first end of the first resistor R1 and the first end of the first capacitor C1; the third end of the first transformer T1 is electrically connected with the TD-end of the Ethernet control chip; the first end of the second transformer T2 is electrically connected to the RD+ end of the Ethernet control chip; the second end of the second transformer T2 is electrically connected to the first end of the second capacitor C2; the third end of the second transformer T2 is electrically connected with the RD-end of the Ethernet control chip; the first end of the third transformer T3 is electrically connected to the Ethernet interface module 3; the second end of the third transformer T3 is electrically connected to the Ethernet interface module 3; the first end of the fourth transformer T4 is electrically connected to the Ethernet interface module 3; the second terminal of the fourth transformer T4 is electrically connected to the ethernet interface module 3.
Specifically, in the present embodiment, referring to fig. 2, a first end of the first transformer T1, i.e., a first pin of the transformer H1199NL, is electrically connected to the td+ end of the ethernet control chip ENC624J 600; a second terminal of the first transformer T1, i.e., a second pin of the transformer H1199NL, is electrically connected to a first terminal of the first resistor R1 and a first terminal of the first capacitor C1; a third terminal of the first transformer T1, namely a third pin of the transformer H1199NL, which is electrically connected to the TD-terminal of the ethernet control chip ENC624J 600; the fourth terminal of the first transformer T1, i.e. the fifteenth pin of the transformer H1199NL, is electrically connected to the first terminal of the third resistor R3 in the second protection module 5.
The first end of the second transformer T2, namely the sixth pin of the transformer H1199NL, is electrically connected to the rd+ end of the ethernet control chip ENC624J 600; a second terminal of the second transformer T2, namely a seventh pin of the transformer H1199NL, electrically connected to the first terminal of the second capacitor C2; the third end of the second transformer T2, namely the eighth pin of the transformer H1199NL, is electrically connected to the RD-end of the Ethernet control chip ENC624J 600; the fourth terminal of the second transformer T2, i.e. the tenth pin of the transformer H1199NL, is electrically connected to the first terminal of the second resistor R2 in the second protection module 5.
The first end of the third transformer T3, namely the ninth pin of the transformer H1199NL, is electrically connected to the sixth pin of the standard RJ-45 ethernet interface; the second end of the third transformer T3, the eleventh pin of the transformer H1199NL, is electrically connected to the third pin of the standard RJ-45 ethernet interface.
A first end of the fourth transformer T4, namely a fourteenth pin of the transformer H1199NL, is electrically connected to a second pin of the standard RJ-45 ethernet interface; the second end of the fourth transformer T4, the sixteenth pin of the transformer H1199NL, is electrically connected to the first pin of the standard RJ-45 ethernet interface.
The preferred resistance value of the first resistor R1 is 75Ω, and the second end of the first resistor R1 is electrically connected to the second power supply; the second supply voltage is preferably 3.3V. The preferred model of the first capacitor C1 and the second capacitor C2 is a tile capacitance of 0.01 μF, and the second terminal of the second capacitor C2 is electrically connected to the first power supply.
It should be noted that other pins of the transformer H1199NL are not important to the present utility model, and thus are not particularly limited.
In one possible embodiment, referring to fig. 2, the second protection module 5 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a third capacitor C3; the first end of the second resistor R2 is electrically connected to the fourth end of the second transformer T2, and the second end of the second resistor R2 is electrically connected to the first end of the third capacitor C3; the first end of the third resistor R3 is electrically connected to the fourth end of the first transformer T1, and the second end of the third resistor R3 is electrically connected to the first end of the third capacitor C3; the first end of the fourth resistor R4 is electrically connected to the ethernet interface module 3, and the second end of the fourth resistor R4 is electrically connected to the first end of the third capacitor C3; a first end of the fifth resistor R5 is electrically connected to the ethernet interface module 3, and a second end of the fifth resistor R5 is electrically connected to a first end of the third capacitor C3; the second terminal of the third capacitor C3 is grounded.
Specifically, in the present embodiment, the preferred resistance values of the second resistor R2, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 are 75Ω. The preferred model of the third capacitor C3 is a 2KV 0.01uF high-voltage ceramic chip capacitor, which can effectively inhibit accidental instant overvoltage caused by lightning strike induction, body static electricity and the like. Wherein the way of electrically connecting the first ends of the second resistor R2 and the third resistor R3 has been described in the previous embodiments. The first end of the fourth resistor R4 is electrically connected to the fourth pin and the fifth pin of the standard RJ-45 ethernet interface. The first end of the fifth resistor R5 is electrically connected to the seventh pin and the eighth pin of the standard RJ-45 ethernet interface.
In one possible embodiment, the first capacitor C1 and the second capacitor C2 are preferably tile capacitances.
In one possible embodiment, the third capacitor C3 is preferably a high voltage tile capacitance.
In one possible embodiment, the ethernet interface module 3 is preferably an eight-pin ethernet interface.
The foregoing description of embodiments of the utility model has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the utility model is defined by the appended claims.
Claims (8)
1. An electrically isolated ethernet interface circuit, the circuit comprising: the device comprises an Ethernet control module (1), a transformation module (2), an Ethernet interface module (3), a first protection module (4) and a second protection module (5);
the first end of the transformation module (2) is the Ethernet control module (1), the second end of the transformation module (2) is electrically connected with the Ethernet interface module (3), and the third end of the transformation module (2) is electrically connected with the first end of the second protection module (5);
the first protection module (4) is electrically connected to the Ethernet control module (1);
the second end of the second protection module (5) is electrically connected to the Ethernet interface module (3), and the third end of the second protection module (5) is grounded.
2. An electrically isolated ethernet interface circuit according to claim 1, wherein said ethernet control module (1) is an ethernet control chip.
3. An electrically isolated ethernet interface circuit according to claim 2, wherein said circuit further comprises a first power source; the first protection module (4) is a protection chip;
the first pin of the protection chip is electrically connected with the RD-end of the Ethernet control chip;
the second pin of the protection chip is electrically connected to the first power supply;
the third pin of the protection chip is electrically connected to the RD+ end of the Ethernet control chip;
the fourth pin of the protection chip is electrically connected with the TD-end of the Ethernet control chip;
the fifth pin of the protection chip is electrically connected to the TD+ end of the Ethernet control chip;
and the sixth pin of the protection chip is grounded.
4. An electrically isolated ethernet interface circuit according to claim 2, wherein said circuit further comprises a first resistor R1, a first capacitor C1 and a second capacitor C2; the transformation module (2) comprises a first transformer T1, a second transformer T2, a third transformer T3 and a fourth transformer T4;
the first end of the first transformer T1 is electrically connected to the TD+ end of the Ethernet control chip;
the second end of the first transformer T1 is electrically connected to the first end of the first resistor R1 and the first end of the first capacitor C1;
the third end of the first transformer T1 is electrically connected with the TD-end of the Ethernet control chip;
the first end of the second transformer T2 is electrically connected to the RD+ end of the Ethernet control chip;
the second end of the second transformer T2 is electrically connected to the first end of the second capacitor C2;
the third end of the second transformer T2 is electrically connected with the RD-end of the Ethernet control chip;
a first end of the third transformer T3 is electrically connected to the Ethernet interface module (3);
the second end of the third transformer T3 is electrically connected with the Ethernet interface module (3);
a first end of the fourth transformer T4 is electrically connected to the Ethernet interface module (3);
the second end of the fourth transformer T4 is electrically connected to the Ethernet interface module (3).
5. An electrically isolated ethernet interface circuit according to claim 4, wherein said second protection module (5) comprises a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a third capacitor C3;
a first end of the second resistor R2 is electrically connected to a fourth end of the second transformer T2, and a second end of the second resistor R2 is electrically connected to a first end of the third capacitor C3;
a first end of the third resistor R3 is electrically connected to a fourth end of the first transformer T1, and a second end of the third resistor R3 is electrically connected to a first end of the third capacitor C3;
a first end of the fourth resistor R4 is electrically connected to the ethernet interface module (3), and a second end of the fourth resistor R4 is electrically connected to a first end of the third capacitor C3;
a first end of the fifth resistor R5 is electrically connected to the ethernet interface module (3), and a second end of the fifth resistor R5 is electrically connected to a first end of the third capacitor C3;
the second end of the third capacitor C3 is grounded.
6. The electrically isolated ethernet interface circuit of claim 4, wherein said first capacitor C1 and said second capacitor C2 are tile capacitors.
7. An electrically isolated ethernet interface circuit according to claim 5, wherein said third capacitor C3 is a high voltage tile capacitor.
8. An electrically isolated ethernet interface circuit according to claim 1, characterized in that said ethernet interface module (3) is an eight pin ethernet interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320971195.9U CN219843434U (en) | 2023-04-25 | 2023-04-25 | Electrically isolated Ethernet interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320971195.9U CN219843434U (en) | 2023-04-25 | 2023-04-25 | Electrically isolated Ethernet interface circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219843434U true CN219843434U (en) | 2023-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320971195.9U Active CN219843434U (en) | 2023-04-25 | 2023-04-25 | Electrically isolated Ethernet interface circuit |
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| Country | Link |
|---|---|
| CN (1) | CN219843434U (en) |
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2023
- 2023-04-25 CN CN202320971195.9U patent/CN219843434U/en active Active
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