CN220544992U - Isolated ADC device - Google Patents
Isolated ADC device Download PDFInfo
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- CN220544992U CN220544992U CN202322137926.2U CN202322137926U CN220544992U CN 220544992 U CN220544992 U CN 220544992U CN 202322137926 U CN202322137926 U CN 202322137926U CN 220544992 U CN220544992 U CN 220544992U
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- 230000005540 biological transmission Effects 0.000 claims abstract description 62
- 238000012545 processing Methods 0.000 claims description 15
- 238000002955 isolation Methods 0.000 abstract description 45
- 238000005070 sampling Methods 0.000 abstract description 10
- 238000004891 communication Methods 0.000 description 7
- 230000008054 signal transmission Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The utility model discloses an isolated ADC device, which comprises a primary side control circuit, a secondary side control circuit and a millimeter wave transmission circuit, which are integrated on the same chip; the primary side control circuit is connected with the secondary side control circuit through the millimeter wave transmission circuit; the millimeter wave transmission circuit comprises a first millimeter wave transmission module and a second millimeter wave transmission module; the secondary side control circuit comprises an ADC module; the output end of the ADC module, the first millimeter wave transmission module and the data output interface of the primary side control circuit are sequentially connected; the secondary side control circuit transmits the signal generated by the ADC module to the primary side control circuit through the first millimeter wave transmission module; the primary side control circuit transmits a clock signal to the ADC module of the secondary side control circuit through the second millimeter wave transmission module. According to the utility model, the single-chip isolation type ADC integrating power isolation, signal isolation and clock isolation is realized, and the sampling rate and dynamic performance of the isolation type ADC are improved.
Description
Technical Field
The present utility model relates to the field of integrated circuit design, and in particular, to an isolated ADC device.
Background
The isolation type ADC (Isolated ADC) is an Analog-to-Digital Converter (Analog-to-Analog) converter with an electrical isolation function. The ADC is added with an electrical isolation technology on the basis of the ADC, and is used for realizing electrical isolation between an input signal and a conversion circuit. In general, a conventional ADC directly contacts an analog input signal with a conversion circuit, and an isolated ADC isolates an electrical connection between the input signal and the conversion circuit by using an isolation device (e.g., an optocoupler, a magnetic coupler, or a transformer).
The design of such isolation provides several advantages:
(1) Electrical isolation: the isolated ADC achieves electrical isolation between the input signal and the conversion circuit to prevent interference caused by different potential differences and electrical noise. This helps to improve the stability, tamper resistance and safety of the system.
(2) Isolation status: the isolated ADC allows signal transmission between systems where the ground potential is different or where a ground loop exists. This facilitates data transfer between measurement and control systems that need to span different sites.
(3) And (3) safety protection: because the input signal is isolated, the isolated ADC can provide higher safety protection against high voltages or currents from directly passing into the back-end electronics system.
(4) Complex environmental applications: isolated ADCs can be used for signal acquisition and control in complex industrial environments to prevent external disturbances from affecting the operation of the system.
However, the existing isolation ADC generally adopts a capacitive coupling or magnetic coupling manner to realize signal isolation; because of the limitation of the technical principle, breakthrough is difficult to realize in terms of signal transmission rate, transmission delay and signal jitter, so that the sampling rate of the isolated ADC is limited to about 20MHz, and the method also becomes a technical bottleneck for realizing signal isolation of the high-speed and high-precision ADC.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: an isolated ADC device is provided, which improves the sampling rate and dynamic performance of the isolated ADC.
In order to solve the technical problems, the utility model adopts the following technical scheme: an isolated ADC device comprises a primary side control circuit, a secondary side control circuit and a millimeter wave transmission circuit; the primary side control circuit, the secondary side control circuit and the millimeter wave transmission circuit are integrated on the same chip; the primary side control circuit is connected with the secondary side control circuit through the millimeter wave transmission circuit; the primary side control circuit is also connected with the processor through a data transmission interface; the millimeter wave transmission circuit comprises a first millimeter wave transmission module and a second millimeter wave transmission module; the secondary side control circuit comprises an ADC module; the output end of the ADC module, the first millimeter wave transmission module and the data output interface of the primary side control circuit are sequentially connected; the secondary side control circuit transmits the signal generated by the ADC module to the primary side control circuit through the first millimeter wave transmission module; the primary side control circuit transmits a clock signal to the ADC module of the secondary side control circuit through the second millimeter wave transmission module.
Wherein the second millimeter wave transmission module includes: a second millimeter wave transmitting circuit, a second millimeter wave transmitting antenna, a second millimeter wave receiving circuit and a second millimeter wave receiving antenna; the input end of the second millimeter wave transmitting circuit is used for receiving a clock signal, and the output end of the second millimeter wave transmitting circuit is connected with the second millimeter wave transmitting antenna; and the output end of the second millimeter wave receiving circuit is connected with the input end of the ADC module, and the input end of the second millimeter wave receiving circuit is connected with the second millimeter wave receiving antenna.
Wherein, the first millimeter wave transmission module includes: the first millimeter wave transmitting circuit, the first millimeter wave transmitting antenna, the first millimeter wave receiving circuit and the first millimeter wave receiving antenna.
The primary side control circuit further comprises a digital signal processing module; the output end of the first millimeter wave receiving circuit is connected with the input end of the digital signal processing module, and the input end of the first millimeter wave receiving circuit is connected with the first millimeter wave receiving antenna; the output end of the digital signal processing module is connected with the processor through the data output interface; and the input end of the first millimeter wave transmitting circuit is connected with the output end of the ADC module, and the output end of the first millimeter wave transmitting circuit is connected with the first millimeter wave transmitting antenna.
The primary side control circuit comprises a data decoding module; the secondary side control circuit also comprises a data coding module; the input end of the data decoding module is connected with the output end of the first millimeter wave receiving circuit, and the output end of the data decoding module is connected with the processor through the data output interface; the input end of the data coding module is connected with the output end of the ADC module, and the output end of the data coding module is connected with the input end of the first millimeter wave transmitting circuit; and the input end of the first millimeter wave transmitting circuit is connected with the output end of the ADC module, and the output end of the first millimeter wave transmitting circuit is connected with the first millimeter wave transmitting antenna.
The interface protocol and the data output interface corresponding to the coding module and the decoding module are consistent.
Wherein, millimeter wave transmission circuit is millimeter wave transmission chip.
The utility model has the beneficial effects that: the primary side control circuit and the secondary side control circuit are integrated on the same chip, a processor is arranged on the single chip, and the processor realizes the control of the primary side control circuit; meanwhile, the primary side control circuit and the secondary side control circuit are communicated through the millimeter wave transmission circuit, and the safety distance requirement between the primary side control circuit and the secondary side control circuit is ensured through the isolation degree of the millimeter wave transmission circuit; furthermore, ADC isolation is realized based on millimeter wave communication technology, single-chip isolation type ADC integrating collector isolation, signal isolation and clock isolation is realized, and the limitations of signal transmission rate and signal jitter are broken, so that breakthrough of the isolation type ADC in terms of sampling rate and dynamic performance is realized.
Drawings
Fig. 1 is a schematic circuit diagram of an isolated ADC device according to an embodiment of the utility model;
fig. 2 is a schematic circuit diagram of an isolated ADC device according to another embodiment of the utility model;
fig. 3 is a schematic structural diagram of a first circuit of a millimeter wave transmission module in an isolated ADC device according to an embodiment of the utility model;
fig. 4 is a schematic diagram of a second circuit of a millimeter transmission module in an isolated ADC device according to an embodiment of the utility model.
Reference numerals illustrate:
isolated ADC device 10
Primary side control circuits 20, 20'
Data decoding Module 21'
Secondary side control circuit 30, 30'
ADC module 31
Data encoding module 32'
Millimeter wave transmission circuit 40
First millimeter wave transmission module 41
First millimeter wave transmitting circuit 411
First millimeter-wave transmit antenna 412
First millimeter wave receiving circuit 413
First millimeter wave receiving antenna 414
Second millimeter wave transmission module 42
Second millimeter wave transmitting circuit 421
Second millimeter-wave transmitting antenna 422
Second millimeter wave receiving circuit 423
Second millimeter-wave receive antenna 424
Processor 50
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
The isolation type ADC device described above can be applied to various isolation application fields requiring ADC type products, such as automation control, scientific research equipment, LED lighting, industrial control equipment, communication equipment, etc., and will be described in the following by way of specific embodiments.
Referring to fig. 1, an isolated ADC apparatus 10 includes a primary side control circuit 20, a secondary side control circuit 30, and a millimeter wave transmission circuit 40.
The primary side control circuit 20, the secondary side control circuit 30 and the millimeter wave transmission circuit 40 are integrated on the same chip.
The primary side control circuit 20 is connected to the secondary side control circuit 30 through the millimeter wave transmission circuit 40.
The primary side control circuit 20 is also coupled to the processor 50 via a data transfer interface (i.e., data Output Interface).
In order to achieve millimeter wave transmission, in an alternative embodiment, the millimeter wave transmission circuit 40 includes a first millimeter wave transmission module 41 and a second millimeter wave transmission module 42.
The secondary side control circuit 30 further comprises an ADC module 31; the output end of the ADC module 31, the first millimeter wave transmission module 41, and the data output interface of the primary side control circuit 20 are sequentially connected.
The secondary side control circuit 30 transmits the signal generated by the ADC module 31 to the primary side control circuit 20 through the first millimeter wave transmission module 41; the primary side control circuit 20 transmits a clock signal to the ADC module 31 of the secondary side control circuit 30 through the second millimeter wave transmission module 42.
Specifically, the first millimeter wave transmission module 41 includes: first millimeter-wave transmitting circuit 411, first millimeter-wave transmitting antenna 412, first millimeter-wave receiving circuit 413, and first millimeter-wave receiving antenna 414. The second millimeter wave transmission module 42 includes: second millimeter wave transmitting circuit 421, second millimeter wave transmitting antenna 422, second millimeter wave receiving circuit 423, and second millimeter wave receiving antenna 424.
The primary side control circuit 20 further comprises a digital signal processing module 21.
An output end of the first millimeter wave receiving circuit 413 is connected to an input end of the digital signal processing module 21, and an input end thereof is connected to the first millimeter wave receiving antenna 414; the output end of the digital signal processing module 21 is connected with the processor 50 through the data output interface.
An input end of the first millimeter wave transmitting circuit 411 is connected to an output end of the ADC module 31, and an output end thereof is connected to the first millimeter wave transmitting antenna 412; the input end of the ADC module 31 is connected to the peripheral circuit through an analog signal input interface.
An input terminal of the second millimeter wave transmitting circuit 421 is configured to receive a clock signal (i.e., CLK signal) input from a peripheral circuit, and an output terminal thereof is connected to the second millimeter wave transmitting antenna 422.
An output terminal of the second millimeter wave receiving circuit 423 is connected to an input terminal of the ADC module 31, and an input terminal thereof is connected to the second millimeter wave receiving antenna 424.
As described above, respective isolation bands are provided between the first millimeter wave transmitting antenna 412 and the first millimeter wave receiving antenna 414, and between the second millimeter wave receiving antenna 422 and the second millimeter wave transmitting antenna 424.
Based on the isolated ADC device described above, the primary side control circuit 20 and the secondary side control circuit 30 are completely isolated by the provided isolation band, and the second millimeter wave transmitting circuit 421 of the primary side control circuit 20 is configured to input a clock signal and transmit the clock signal to the second millimeter wave receiving antenna 421 of the secondary side control circuit 30 through the second millimeter wave transmitting antenna 424 based on the millimeter wave signal, where the second millimeter wave receiving antenna 423 transmits the clock signal to the ADC module 31 as a sampling clock of the ADC module 31.
The ADC module 31 samples the raw data in response to the sampling clock, and generates a corresponding digital signal through analog-to-digital conversion; the first millimeter wave transmitting circuit 411 receives the digital signal output by the ADC module 31, and transmits the digital signal to the first millimeter wave receiving antenna 414 of the primary side control circuit 30 through the first millimeter wave transmitting antenna 412 based on the millimeter wave signal, and the first millimeter wave receiving circuit 413 transmits the digital signal to the digital signal processing module 21.
The digital signal processing module 21 processes the received digital signal and transmits the processed digital signal to the processor 50 through a data output interface. Specifically, the digital signal processing module 21 performs a decimation filtering operation mainly on code stream data, and transmits the processed sampling result to the processor 50 through the data output interface.
Further, to achieve data synchronization, the clock signal is also simultaneously transmitted to the digital signal processing module 21 as a reference clock.
In this embodiment, the data output interface may be an interface such as SPI or I2C, LVDS, parallel, and is selected according to the requirements of the processor.
Because millimeter wave communication can realize the communication rate of 10Gbps at the highest, signal delay is within 3ns, and signal jitter can be controlled at ps level; in addition, by controlling the power, millimeter waves can easily realize centimeter-level communication distance, and the isolation pressure-resistant capacity of the millimeter waves is greatly improved; based on the characteristics, millimeter wave isolation can completely meet the requirements of the high-speed high-precision ADC on signals on the basis of realizing enhanced isolation. In addition, the millimeter wave isolation has the advantage of greatly reducing the requirement of the DC-DC module on the size of the transformer, and the on-chip transformer can meet the requirement, so that a single-chip isolation type ADC scheme comprising power isolation, data isolation and clock isolation can be realized.
In this embodiment, the millimeter wave transmission circuit is used to realize signal transmission between the primary side control circuit 20 and the secondary side control circuit 30, and since the millimeter wave transmission circuit 40 is used to realize signal transmission by millimeter waves, the isolation between the primary side control circuit 20 and the secondary side control circuit 30 is spatially achieved, and the signal transmission speed is greatly improved.
In another alternative embodiment, the millimeter wave transmission circuit 40 is a millimeter wave transmission chip, and the size of the switching power supply can be further reduced through a chip design, so as to realize a light and thin design of the device.
Referring to fig. 2, in an alternative embodiment, the primary side control circuit 20 'includes a data decoding module 21'; the secondary side control circuit 30 'also includes a data encoding module 32'.
An input end of the data decoding module 21' is connected to an output end of the first millimeter wave receiving circuit 413, and an output end thereof is connected to the processor 50 through the data output interface.
An input end of the data encoding module 32 'is connected to an output end of the ADC module 31', and an output end thereof is connected to an input end of the first millimeter wave transmitting circuit 411.
Based on the isolated ADC apparatus as described above, the primary side control circuit 20 'and the secondary side control circuit 30' are completely isolated by the provided isolation band, the first millimeter wave transmitting circuit 411 of the primary side control circuit 20 'is configured to input a clock signal, and transmit the clock signal to the first millimeter wave receiving antenna 414 of the secondary side control circuit 30' based on the millimeter wave signal through the first millimeter wave transmitting antenna 412, and the second millimeter wave receiving circuit 413 transmits the clock signal to the ADC module 31 'as a sampling clock of the ADC module 31'.
The ADC module 31' is configured to sample the raw data in response to the sampling clock, and generate a corresponding digital signal through analog-to-digital conversion; the data encoding module 32 'is configured to receive the digital signal generated by the ADC module 31' and perform encoding processing to convert data of different protocol interfaces into serial data. The first millimeter wave transmitting circuit 411 receives the encoded signal output by the encoding module 32', and transmits the encoded signal to the first millimeter wave receiving antenna 414 of the primary side control circuit 20' through the first millimeter wave transmitting antenna 412 based on the millimeter wave signal, and the first millimeter wave receiving circuit 413 transmits the encoded signal to the decoding module 21'.
The decoding module 21' processes the received encoded signal, decodes the serial data into data corresponding to the communication protocol, and transmits the data to the processor 50 for processing through the data output interface.
In this embodiment, the interface protocol and the data output interface corresponding to the encoding module 32 'and the decoding module 21' are identical.
Referring to fig. 4, the millimeter wave transmitting circuit includes a digital-to-analog converter, a first baseband amplifier, a first mixer, a first phase-locked loop, a first radio frequency amplifier, and a first filter;
the first millimeter wave receiving circuit comprises a second filter, a second radio frequency amplifier, a second mixer, a second phase-locked loop, a second baseband amplifier and an analog-to-digital converter;
the second input end of the first mixer is connected with the output end of the phase-locked loop, and the output end of the first mixer is connected with the input end of the second radio frequency amplifier;
the output end of the first radio frequency amplifier is connected with the input end of the first filter;
the output end of the first filter is connected with the transmitting antenna;
the input end of the second filter is connected with the receiving antenna, and the output end of the second filter is connected with the first input end of the second mixer;
and a second input end of the second mixer is connected with an output end of the second phase-locked loop, and an output end of the second mixer is connected with an input end of the second baseband filter.
As described above, the first millimeter wave transmitting circuit 411, the first millimeter wave receiving circuit 413, the second millimeter wave transmitting circuit 421 and the second millimeter wave receiving circuit 423 in the embodiment of the present utility model are all the circuit structures described above, and are not described in detail herein.
The output end of the second baseband filter is used for being connected with the input end of the ADC module, and the output end of the ADC module is connected with the first input end of the first mixer.
Referring to fig. 4, the millimeter wave transmitting circuit includes an oscillator, a modulator and a third radio frequency amplifier;
the millimeter wave receiving circuit comprises a fourth radio frequency amplifier and an envelope detector;
the output end of the oscillator is connected with the first input end of the modulator;
the second input end of the modulator is connected with the digital signal output interface, and the output end of the modulator is connected with the input end of the third radio frequency amplifier;
the output end of the third radio frequency amplifier is connected with the transmitting antenna;
the input end of the fourth radio frequency amplifier is connected with the receiving antenna, and the output end of the fourth radio frequency amplifier is connected with the input end of the envelope detector;
and the output end of the envelope detector is connected with the input end of the ADC module.
As described above, the first millimeter wave transmitting circuit 411, the first millimeter wave receiving circuit 413, the second millimeter wave transmitting circuit 421 and the second millimeter wave receiving circuit 423 in the embodiment of the present utility model are all the circuit structures described above, and are not described in detail herein.
In summary, in the isolated ADC device provided by the present utility model, the primary side control circuit and the secondary side control circuit are integrated on the same chip, and a processor is disposed on a single chip, so that the processor controls the primary side control circuit; meanwhile, the primary side control circuit and the secondary side control circuit are communicated through the millimeter wave transmission circuit, and the safety distance requirement between the primary side control circuit and the secondary side control circuit is ensured through the isolation degree of the millimeter wave transmission circuit; furthermore, ADC isolation is realized based on millimeter wave communication technology, single-chip isolation type ADC integrating collector isolation, signal isolation and clock isolation is realized, and the limitations of signal transmission rate and signal jitter are broken, so that breakthrough of the isolation type ADC in terms of sampling rate and dynamic performance is realized.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.
Claims (7)
1. An isolated ADC device comprises a primary side control circuit and a secondary side control circuit, and is characterized by further comprising a millimeter wave transmission circuit;
the primary side control circuit, the secondary side control circuit and the millimeter wave transmission circuit are integrated on the same chip;
the primary side control circuit is connected with the secondary side control circuit through the millimeter wave transmission circuit;
the primary side control circuit is also connected with the processor through a data transmission interface;
the millimeter wave transmission circuit comprises a first millimeter wave transmission module and a second millimeter wave transmission module;
the secondary side control circuit comprises an ADC module; the output end of the ADC module, the first millimeter wave transmission module and the data output interface of the primary side control circuit are sequentially connected;
the secondary side control circuit transmits the signal generated by the ADC module to the primary side control circuit through the first millimeter wave transmission module; the primary side control circuit transmits a clock signal to the ADC module of the secondary side control circuit through the second millimeter wave transmission module.
2. The isolated ADC apparatus of claim 1, wherein the second millimeter wave transmission module comprises: a second millimeter wave transmitting circuit, a second millimeter wave transmitting antenna, a second millimeter wave receiving circuit and a second millimeter wave receiving antenna;
the input end of the second millimeter wave transmitting circuit is used for receiving a clock signal, and the output end of the second millimeter wave transmitting circuit is connected with the second millimeter wave transmitting antenna; and the output end of the second millimeter wave receiving circuit is connected with the input end of the ADC module, and the input end of the second millimeter wave receiving circuit is connected with the second millimeter wave receiving antenna.
3. The isolated ADC apparatus of claim 2, wherein the first millimeter wave transmission module comprises: the first millimeter wave transmitting circuit, the first millimeter wave transmitting antenna, the first millimeter wave receiving circuit and the first millimeter wave receiving antenna.
4. An isolated ADC unit according to claim 3, wherein said primary side control circuit further comprises a digital signal processing module;
the output end of the first millimeter wave receiving circuit is connected with the input end of the digital signal processing module, and the input end of the first millimeter wave receiving circuit is connected with the first millimeter wave receiving antenna; the output end of the digital signal processing module is connected with the processor through the data output interface;
and the input end of the first millimeter wave transmitting circuit is connected with the output end of the ADC module, and the output end of the first millimeter wave transmitting circuit is connected with the first millimeter wave transmitting antenna.
5. An isolated ADC unit according to claim 3, wherein the primary side control circuit comprises a data decoding module;
the secondary side control circuit also comprises a data coding module;
the input end of the data decoding module is connected with the output end of the first millimeter wave receiving circuit, and the output end of the data decoding module is connected with the processor through the data output interface;
the input end of the data coding module is connected with the output end of the ADC module, and the output end of the data coding module is connected with the input end of the first millimeter wave transmitting circuit;
and the input end of the first millimeter wave transmitting circuit is connected with the output end of the ADC module, and the output end of the first millimeter wave transmitting circuit is connected with the first millimeter wave transmitting antenna.
6. An isolated ADC assembly according to claim 5, wherein the corresponding interface protocols of the coding and decoding modules are identical to the data output interface.
7. An isolated ADC unit according to any one of claims 1-6, wherein the millimeter wave transmission circuit is a millimeter wave transmission chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322137926.2U CN220544992U (en) | 2023-08-09 | 2023-08-09 | Isolated ADC device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322137926.2U CN220544992U (en) | 2023-08-09 | 2023-08-09 | Isolated ADC device |
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| Publication Number | Publication Date |
|---|---|
| CN220544992U true CN220544992U (en) | 2024-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322137926.2U Active CN220544992U (en) | 2023-08-09 | 2023-08-09 | Isolated ADC device |
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|---|---|
| CN (1) | CN220544992U (en) |
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2023
- 2023-08-09 CN CN202322137926.2U patent/CN220544992U/en active Active
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