CN220545014U - Net gape filter circuit - Google Patents
Net gape filter circuit Download PDFInfo
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- CN220545014U CN220545014U CN202322215885.4U CN202322215885U CN220545014U CN 220545014 U CN220545014 U CN 220545014U CN 202322215885 U CN202322215885 U CN 202322215885U CN 220545014 U CN220545014 U CN 220545014U
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- 239000003990 capacitor Substances 0.000 claims description 83
- 239000011324 bead Substances 0.000 claims description 30
- 238000001914 filtration Methods 0.000 claims description 21
- 238000002955 isolation Methods 0.000 claims description 14
- 238000004804 winding Methods 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 9
- 230000006978 adaptation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The utility model discloses a network port filter circuit which is applied to the field of network ports. The circuit provided by the utility model comprises: the circuit comprises a PHY chip, a network transformer, an RJ45 terminal and a first filter circuit; the first end of the PHY chip is grounded, and the second end of the PHY chip is connected with the first end of the network transformer; the second end of the network transformer is connected with an RJ45 terminal; the first end of the first filter circuit is connected with the second end of the network transformer and the RJ45 terminal, and the second end of the first filter circuit is grounded. The common mode interference generated in the filter network port through the switching power supply during working or generated by the high-speed circuit inside the equipment can be filtered through the filter circuit, so that the common mode interference is prevented from being transmitted to the RJ45 terminal through the network transformer, and other equipment in a signal network is further affected. Meanwhile, the circuit provided by the application can not influence signal transmission, can reduce conduction emission level, and improves electromagnetic compatibility of the network port circuit.
Description
Technical Field
The utility model relates to the field of network ports, in particular to a network port filter circuit.
Background
Modern electromagnetic environments are increasingly complex, and electromagnetic compatibility of devices not only requires that electronic devices not be affected by external electromagnetic interference, but also requires that the electronic devices themselves not produce electromagnetic interference to affect other devices. At present, electromagnetic compatibility design of a network port is more prone to external interference protection, such as static electricity, surge, pulse group interference and the like, a network port typical Bob-Smith circuit is connected between a network transformer and an RJ45 terminal, so that an anti-surge effect can be achieved, meanwhile, a TVS group is connected to a signal line at the rear stage of the network transformer, wherein the TVS (Transient Voltage Suppressor) can achieve the effects of preventing static electricity and pulse group interference, and accuracy of signal transmission is guaranteed.
The traditional filter circuit can improve the anti-interference capability of a network port, but common mode interference generated from the inside of equipment is conducted out through a network cable to affect other equipment. There are various sources of common mode interference, which are usually generated when a switching power supply works or generated by a high-speed circuit inside the device, and if there is no corresponding filter circuit, part of the common mode interference can be transmitted to an RJ45 terminal through a high-voltage capacitor connected with a rear-stage center tap of a network transformer when the common mode interference arrives at a network port circuit, so that other devices in a signal network are affected.
In view of the above-mentioned technology, it is a problem to be solved by those skilled in the art to find a network port filter circuit capable of filtering common mode interference generated by electromagnetic devices.
Disclosure of Invention
The utility model aims to provide a network port filter circuit. Common mode interference generated by the screen port can be filtered, so that normal use of other devices is prevented from being influenced.
In order to solve the above technical problems, the present utility model provides a network port filter circuit, including: the circuit comprises a PHY chip, a network transformer, an RJ45 terminal and a first filter circuit;
the first end of the PHY chip is grounded, and the second end of the PHY chip is connected with the first end of the network transformer;
the second end of the network transformer is connected with an RJ45 terminal;
the first end of the first filter circuit is connected with the second end of the network transformer and the RJ45 terminal, and the second end of the first filter circuit is grounded.
Preferably, the first filter circuit includes: an inductance and a first capacitance;
the first end of the inductor is grounded, and the second end of the inductor is connected with the first end of the first capacitor;
the second end of the first capacitor is connected with the second end of the network transformer and the RJ45 terminal.
Preferably, the first filter circuit includes: a magnetic bead and a second capacitor;
the first end of the magnetic bead is grounded, and the second end of the magnetic bead is connected with the first end of the second capacitor;
the second end of the second capacitor is connected with the second end of the network transformer and the RJ45 terminal.
Preferably, the first filter circuit includes: the magnetic bead comprises an inductor, a first capacitor, a magnetic bead and a second capacitor;
the first end of the inductor is grounded, and the second end of the inductor is connected with the first end of the first capacitor;
the second end of the first capacitor is connected with the second end of the network transformer and the RJ45 terminal;
the first end of the magnetic bead is connected with the first end of the inductor and grounded, and the second end of the magnetic bead is connected with the first end of the second capacitor;
the second end of the second capacitor is connected with the second end of the first capacitor, the second end of the network transformer and the RJ45 terminal.
Preferably, the method further comprises: a second filter circuit;
the first end of the second filter circuit is connected with the second end of the network transformer and the RJ45 terminal, and the second end of the second filter circuit is grounded.
Preferably, the second filter circuit includes: an isolation filter circuit;
the first end of the isolation filter circuit is connected with the second end of the network transformer and the RJ45 terminal, and the second end of the isolation filter circuit is connected with the first end of the first filter circuit.
Preferably, the second filter circuit further includes: TVS group;
the first end of the TVS group is connected with the second end of the network transformer and the RJ45 terminal, and the second end of the TVS group is connected with the second end of the first filter circuit and grounded.
Preferably, the capacitor further comprises a third capacitor and a fourth capacitor;
the first end of the third capacitor is connected with the first end of the PHY chip and the first end of the network transformer, and the second end of the third capacitor is grounded;
the first end of the fourth capacitor is connected with the first end of the PHY chip, the first end of the network transformer and the first end of the third capacitor, and the second end of the fourth capacitor is connected with the second end of the third capacitor and grounded.
Preferably, the isolation filter circuit is a Bob-Smith classical circuit.
Preferably, the number of TVSs in a TVS group is determined by the number of windings in the network transformer.
The utility model provides a network port filter circuit, which comprises: the circuit comprises a PHY chip, a network transformer, an RJ45 terminal and a first filter circuit; the first end of the PHY chip is grounded, and the second end of the PHY chip is connected with the first end of the network transformer; the second end of the network transformer is connected with an RJ45 terminal; the first end of the first filter circuit is connected with the second end of the network transformer and the RJ45 terminal, and the second end of the first filter circuit is grounded. The common mode interference generated in the filter network port through the switching power supply during working or generated by the high-speed circuit inside the equipment can be filtered through the filter circuit, so that the common mode interference is prevented from being transmitted to the RJ45 terminal through the network transformer, and other equipment in the signal network is further affected. Meanwhile, the circuit provided by the application can not influence signal transmission, can reduce conduction emission level, and improves electromagnetic compatibility of the network port circuit.
Drawings
For a clearer description of embodiments of the present utility model, the drawings that are required to be used in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
Fig. 1 is a block diagram of a network port filtering circuit provided in an embodiment of the present application;
fig. 2 is a schematic diagram of a first filter circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a second first filter circuit according to an embodiment of the present disclosure;
fig. 4 is a waveform diagram of an embodiment of the present application without adding a first filter circuit;
fig. 5 is a waveform diagram of adding a first filter circuit according to an embodiment of the present application;
FIG. 6 is a block diagram showing a complete network port filter circuit according to an embodiment of the present application;
fig. 7 is a circuit diagram of a network port filtering circuit provided in an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by a person of ordinary skill in the art without making any inventive effort are within the scope of the present utility model.
The core of the utility model is to provide a network port filter circuit. Common mode interference generated by the screen port can be filtered, so that normal use of other devices is prevented from being influenced.
In order to better understand the aspects of the present utility model, the present utility model will be described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is a block diagram of a network port filtering circuit according to an embodiment of the present application, as shown in the drawing, the network port filtering circuit includes: a PHY chip 1, a network transformer 2, RJ45 terminals 3 and a first filter circuit 4;
the first end of the PHY chip 1 is grounded, and the second end of the PHY chip 1 is connected with the first end of the network transformer 2;
a second end of the network transformer 2 is connected with the RJ45 terminal 3;
the first end of the first filter circuit 4 is connected to the second end of the network transformer 2 and the RJ45 terminal 3, and the second end of the first filter circuit 4 is grounded.
In a specific embodiment, as shown in the figure, the first end of the PHY chip 1 is grounded, and the second end of the PHY chip 1 is connected to the first end of the network transformer 2, that is, the signal line of the PHY chip 1 is directly connected to the corresponding pin of the network transformer 2. The first end of the first filter circuit 4 is connected with the second end of the network transformer 2 and the RJ45 terminal 3, and the second end of the first filter circuit 4 is grounded, that is, the first filter circuit 4 is added at the rear stage of the network transformer 2, so that common mode interference from the ground of the front stage of the network transformer 2 can be effectively filtered, and the conduction emission level is reduced.
The specific circuit structure of the first filter circuit 4 is not limited in this application, and may be set according to the needs of the user.
The utility model provides a network port filter circuit, which comprises: the circuit comprises a PHY chip, a network transformer, an RJ45 terminal and a first filter circuit; the first end of the PHY chip is grounded, and the second end of the PHY chip is connected with the first end of the network transformer; the second end of the network transformer is connected with an RJ45 terminal; the first end of the first filter circuit is connected with the second end of the network transformer and the RJ45 terminal, and the second end of the first filter circuit is grounded. The common mode interference generated in the filter network port through the switching power supply during working or generated by the high-speed circuit inside the equipment can be filtered through the filter circuit, so that the common mode interference is prevented from being transmitted to the RJ45 terminal through the network transformer, and other equipment in the signal network is further affected. Meanwhile, the circuit provided by the application can not influence signal transmission, can reduce conduction emission level, and improves electromagnetic compatibility of the network port circuit.
On the basis of the above embodiments, as a preferred embodiment, the first filter circuit includes: an inductance and a first capacitance;
the first end of the inductor is grounded, and the second end of the inductor is connected with the first end of the first capacitor;
the second end of the first capacitor is connected with the second end of the network transformer and the RJ45 terminal.
Or, the first filter circuit includes: a magnetic bead and a second capacitor;
the first end of the magnetic bead is grounded, and the second end of the magnetic bead is connected with the first end of the second capacitor;
the second end of the second capacitor is connected with the second end of the network transformer and the RJ45 terminal.
Or, the first filter circuit includes: the magnetic bead comprises an inductor, a first capacitor, a magnetic bead and a second capacitor;
the first end of the inductor is grounded, and the second end of the inductor is connected with the first end of the first capacitor;
the second end of the first capacitor is connected with the second end of the network transformer and the RJ45 terminal;
the first end of the magnetic bead is connected with the first end of the inductor and grounded, and the second end of the magnetic bead is connected with the first end of the second capacitor;
the second end of the second capacitor is connected with the second end of the first capacitor, the second end of the network transformer and the RJ45 terminal.
In a specific embodiment, the first filter circuit may preferably have a plurality of embodiments. First, as shown in fig. 2, the first filter circuit includes an inductor L1 and a first capacitor C1, where a first end of the inductor L1 is grounded, and a second end of the inductor L1 is connected to a first end of the first capacitor C1; the second end of the first capacitor C1 is connected with the second end of the network transformer and the RJ45 terminal, wherein a first filter circuit formed by the inductor L1 and the first capacitor C1 can filter common-mode interference with lower frequency from the front stage of the network transformer; second, as shown in fig. 3, the first filter circuit includes a magnetic bead F1 and a second capacitor C2; the first end of the magnetic bead F1 is grounded, and the second end of the magnetic bead F1 is connected with the first end of the second capacitor C2; the second end of the second capacitor C2 is connected with the second end of the network transformer and the RJ45 terminal, wherein the first filter circuit formed by the magnetic bead F1 and the second capacitor C2 filters common-mode interference with higher frequency from the front stage of the network transformer; third, the first filter circuit includes: the magnetic bead F comprises an inductor L1, a first capacitor C1, a magnetic bead F1 and a second capacitor C2; the first end of the inductor L1 is grounded, and the second end of the inductor L1 is connected with the first end of the first capacitor C1; the second end of the first capacitor C1 is connected with the second end of the network transformer and the RJ45 terminal; the first end of the magnetic bead F1 is connected with the first end of the inductor L1 and grounded, and the second end of the magnetic bead F1 is connected with the first end of the second capacitor C2; the second end of the second capacitor C2 is connected with the second end of the first capacitor C1, the second end of the network transformer and the RJ45 terminal, that is, the first filter circuit includes specific circuit devices in the first case and the second case, and the circuit in the first case and the circuit in the second case are connected in parallel, so that common mode interference from the front stage of the network transformer can be filtered simultaneously.
Preferably, the inductor has the following specification: 50 mu-500 mu; the specification of the first capacitor is as follows: 100p-4700pF; the specification of the magnetic beads is as follows: 1MHz-30MHz,30Ω -1500Ω.
Meanwhile, fig. 4 is a waveform diagram provided in the embodiment of the present application, where the first filter circuit is not added, and fig. 5 is a waveform diagram provided in the embodiment of the present application, where the waveform diagram added with the first filter circuit is shown in fig. 4 and fig. 5, it can be obviously seen that in fig. 4, the conduction emission has a frequency point that obviously exceeds the standard, and in fig. 5, the conduction emission level is greatly reduced as a whole, so as to improve the electromagnetic compatibility performance of the network port.
It should be noted that, the three expression forms provided in the application are only three modes which can be realized, and which can be selected according to the needs of the user in specific working conditions. Meanwhile, it should be noted that the three expression forms provided by the application can realize common-mode interference filtering, but are not limited to the three expression forms, and can be set by the user according to the needs of the user.
The embodiment of the application provides the selection of various first filter circuits, gives the user various selections, and can select different filter circuits according to the current working condition, so that common-mode interference is filtered through the selected first filter circuits.
On the basis of the above embodiment, as a preferred embodiment, further comprising: a second filter circuit;
the first end of the second filter circuit is connected with the second end of the network transformer and the RJ45 terminal, and the second end of the second filter circuit is grounded.
The second filter circuit comprises an isolation filter circuit and a TVS group;
the first end of the isolation filter circuit is connected with the second end of the network transformer and the RJ45 terminal, and the second end of the isolation filter circuit is connected with the first end of the first filter circuit. Preferably, the isolation filter circuit is a Bob-Smith classical circuit.
The first end of the TVS group is connected with the second end of the network transformer and the RJ45 terminal, and the second end of the TVS group is connected with the second end of the first filter circuit and grounded. Wherein the number of TVSs in a TVS group is determined by the number of windings in the network transformer.
In a specific embodiment, the network port filter circuit further includes a second filter circuit, configured to filter interference of an external device, where the second filter circuit includes: isolating the filter circuit and TVS group. As one preferable mode, the isolation filter circuit adopts a Bob-Smith classical circuit, wherein the resistance is 75Ω, the Bob-Smith classical circuit can play an anti-surge role, and TVS on a signal line of a rear stage of the network transformer can play an anti-static and pulse group interference role in a group, so that the accuracy of signal transmission is ensured.
On the basis of the above embodiment, as a preferred embodiment, a third capacitor and a fourth capacitor are further included;
the first end of the third capacitor is connected with the first end of the PHY chip and the first end of the network transformer, and the second end of the third capacitor is grounded;
the first end of the fourth capacitor is connected with the first end of the PHY chip, the first end of the network transformer and the first end of the third capacitor, and the second end of the fourth capacitor is connected with the second end of the third capacitor and grounded.
In summary, in the embodiments of the present application and the foregoing embodiments, a block diagram of a complete network port filter circuit is shown in fig. 6, where the block diagram includes: PHY chip 1, network transformer 2, RJ45 terminal 3, first filter circuit 4 and second filter circuit 5. The circuit diagram of the network port filter circuit is shown in fig. 7 (wherein the first filter circuit comprises an inductor and a first capacitor), the PHY chip VDD-PHY-1, the network transformer T1, the RJ45 terminal J1, the inductor L1, the first capacitor C1, the isolation filter circuit in the second filter circuit comprises 4 resistors, respectively R2, R3, R4, R5, and the TVS group in the second filter circuit comprises 4 TVS, respectively D1, D2, D3, D4. The capacitor also comprises a third capacitor C3 and a fourth capacitor C4. Wherein T1 has 16 ports, 8 ports of the 16 ports are connected with VDD-PHY-1 and J1, and the remaining 4 ports are connected with the remaining circuits. J1 has 8 ports.
The specific connection manner is shown in fig. 7, wherein the second port and the seventh port of the T1 are connected to VDD-PHY-1; the first end of C3 is connected with the second port and the seventh port of VDD-PHY-1 and T1; the second end of C3 is grounded; c4 is connected in parallel with C3, i.e., the first end of C4 is connected with the second port of VDD-PHY-1, TI, the seventh port of T1, and the first end of C3; the second end of C4 is connected with the second end of C3 and grounded; the ninth port of T1 is connected with the first end of D1; the tenth port of T1 is connected with the first end of R2; an eleventh port of T1 is connected with the first end of D2; the fourteenth port of T1 is connected with the first end of D3; the fifteenth port of T1 is connected with the first end of R3; the sixteenth port of T1 is connected with the first end of D4; the second end of D1, the second end of D2, the second end of D3 and the second end of D4 are connected, and are connected with the first end of L1 and are grounded; the first port of J1 is connected with the ninth port of T1 and the first end of D1; the second port of J1 is connected with the eleventh port of T1 and the first end of D2; the third port of J1 is connected with the fourteenth port of T1 and the first end of D3; the fourth port of J1 is connected with the first end of R5; the fifth port of J1 is connected with the fourth port of J1 and the first end of R5; the sixth port of J1 is connected with the sixteenth port of T1 and the first end of D4; the seventh port of J1 is connected with the first end of R4; the eighth port of J1 is connected with the seventh port of J1 and the first end of R4; the second ends of R2, R3, R4 and R5 are connected with the second end of C1; the first end of C1 is connected to the second end of L1.
The utility model provides a network port filter circuit, which comprises: the circuit comprises a PHY chip, a network transformer, an RJ45 terminal and a first filter circuit; the first end of the PHY chip is grounded, and the second end of the PHY chip is connected with the first end of the network transformer; the second end of the network transformer is connected with an RJ45 terminal; the first end of the first filter circuit is connected with the second end of the network transformer and the RJ45 terminal, and the second end of the first filter circuit is grounded. The common mode interference generated in the filter network port through the switching power supply during working or generated by the high-speed circuit inside the equipment can be filtered through the filter circuit, so that the common mode interference is prevented from being transmitted to the RJ45 terminal through the network transformer, and other equipment in the signal network is further affected. Meanwhile, the circuit provided by the application can not influence signal transmission, can reduce conduction emission level, and improves electromagnetic compatibility of the network port circuit.
The network port filter circuit provided by the utility model is described in detail above. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A portal filtering circuit, comprising: the circuit comprises a PHY chip, a network transformer, an RJ45 terminal and a first filter circuit;
the first end of the PHY chip is grounded, and the second end of the PHY chip is connected with the first end of the network transformer;
the second end of the network transformer is connected with the RJ45 terminal;
the first end of the first filter circuit is connected with the second end of the network transformer and the RJ45 terminal, and the second end of the first filter circuit is grounded.
2. The portal filtering circuit of claim 1, wherein the first filtering circuit comprises: an inductance and a first capacitance;
the first end of the inductor is grounded, and the second end of the inductor is connected with the first end of the first capacitor;
the second end of the first capacitor is connected with the second end of the network transformer and the RJ45 terminal.
3. The portal filtering circuit of claim 1, wherein the first filtering circuit comprises: a magnetic bead and a second capacitor;
the first end of the magnetic bead is grounded, and the second end of the magnetic bead is connected with the first end of the second capacitor;
the second end of the second capacitor is connected with the second end of the network transformer and the RJ45 terminal.
4. The portal filtering circuit of claim 1, wherein the first filtering circuit comprises: the magnetic bead comprises an inductor, a first capacitor, a magnetic bead and a second capacitor;
the first end of the inductor is grounded, and the second end of the inductor is connected with the first end of the first capacitor;
the second end of the first capacitor is connected with the second end of the network transformer and the RJ45 terminal;
the first end of the magnetic bead is connected with the first end of the inductor and grounded, and the second end of the magnetic bead is connected with the first end of the second capacitor;
the second end of the second capacitor is connected with the second end of the first capacitor, the second end of the network transformer and the RJ45 terminal.
5. The portal filtering circuit of claim 1, further comprising: a second filter circuit;
the first end of the second filter circuit is connected with the second end of the network transformer and the RJ45 terminal, and the second end of the second filter circuit is grounded.
6. The portal filtering circuit of claim 5, wherein the second filtering circuit comprises: an isolation filter circuit;
the first end of the isolation filter circuit is connected with the second end of the network transformer and the RJ45 terminal, and the second end of the isolation filter circuit is connected with the first end of the first filter circuit.
7. The portal filtering circuit of claim 6, wherein the second filtering circuit further comprises: TVS group;
the first end of the TVS group is connected with the second end of the network transformer and the RJ45 terminal, and the second end of the TVS group is connected with the second end of the first filter circuit and grounded.
8. The notch filter circuit of any of claims 1-7 further comprising a third capacitor and a fourth capacitor;
the first end of the third capacitor is connected with the first end of the PHY chip and the first end of the network transformer, and the second end of the third capacitor is grounded;
the first end of the fourth capacitor is connected with the first end of the PHY chip, the first end of the network transformer and the first end of the third capacitor, and the second end of the fourth capacitor is connected with the second end of the third capacitor and grounded.
9. The portal filtering circuit of claim 6, wherein the isolation filtering circuit is a Bob-Smith classical circuit.
10. The portal filtering circuit of claim 7, wherein the number of TVSs in the TVS group is determined by the number of windings in the network transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322215885.4U CN220545014U (en) | 2023-08-17 | 2023-08-17 | Net gape filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322215885.4U CN220545014U (en) | 2023-08-17 | 2023-08-17 | Net gape filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220545014U true CN220545014U (en) | 2024-02-27 |
Family
ID=89965353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322215885.4U Active CN220545014U (en) | 2023-08-17 | 2023-08-17 | Net gape filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220545014U (en) |
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2023
- 2023-08-17 CN CN202322215885.4U patent/CN220545014U/en active Active
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