CN114928160A - Intelligent power cabinet supervisory equipment - Google Patents

Intelligent power cabinet supervisory equipment Download PDF

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Publication number
CN114928160A
CN114928160A CN202210502230.2A CN202210502230A CN114928160A CN 114928160 A CN114928160 A CN 114928160A CN 202210502230 A CN202210502230 A CN 202210502230A CN 114928160 A CN114928160 A CN 114928160A
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CN
China
Prior art keywords
module
monitoring
fsu
direct current
command
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210502230.2A
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Chinese (zh)
Inventor
易宇升
范亚森
李亮亮
杨凯平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Tongding Broadband Co ltd
Original Assignee
Jiangsu Tongding Broadband Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Tongding Broadband Co ltd filed Critical Jiangsu Tongding Broadband Co ltd
Priority to CN202210502230.2A priority Critical patent/CN114928160A/en
Publication of CN114928160A publication Critical patent/CN114928160A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
    • H02J13/00026—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission involving a local wireless network, e.g. Wi-Fi, ZigBee or Bluetooth
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Health & Medical Sciences (AREA)
  • Computing Systems (AREA)
  • General Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides an intelligent power cabinet monitoring device, which comprises: the system comprises an FSU moving loop module, a monitoring center cloud platform, a shunt control panel, a local monitoring module and a rectification module; the FSU moving ring module is respectively connected with the monitoring center cloud platform and the local monitoring module, and the local monitoring module is also respectively connected with the local monitoring liquid crystal screen and the shunt control panel. The shunt circuit control panel is also connected with a rectification module. The FSU moving ring module is also connected with the WiFi module, the 4G/NB module and the Bluetooth module respectively. The invention has various debugging modes (mobile phone APP, WIFI, 485, 4G \ NB-IOT controllers) to check related parameters and set parameters, and the remote operation and maintenance are more convenient. The system integrates the FSU moving loop monitoring module, can be directly butted with a monitoring center energy platform, realizes independent monitoring, and solves the problem that outdoor application scenes are inconvenient to monitor.

Description

Intelligent power cabinet supervisory equipment
Technical Field
The invention relates to the field of 5G communication power supply equipment, in particular to intelligent power supply cabinet monitoring equipment.
Background
The monitoring system for the power cabinet of the communication base station has remarkable help for improving the efficiency of power management, can solve the problems of scattered stations, large equipment quantity, large maintenance workload, high management cost and the like, is favorable for reducing the frequency of power failure, and ensures the safety and stability of communication transmission.
The 5G base station has large energy consumption and puts new requirements on the traditional power cabinet, and the conventional power monitoring product is usually turned off or turned on again in a local and wireless remote mode as shown in figure 1, so that energy management is realized, and the purposes of energy conservation and power saving are achieved.
The defects of the existing power supply monitoring product are as follows:
1. the monitoring mode is relatively single, the communication mode between the equipment end and the monitoring background is limited, and the RS485 communication is mainly adopted at present.
2. The debugging mode is single relatively, and the equipment end debugging mainly is RS485 communication, needs to use the computer to connect the 485 port of equipment during the debugging.
Disclosure of Invention
The purpose of the invention is realized by the following technical scheme.
The invention provides a novel monitoring scheme, which is convenient for operation and operation of an energy system, solves the problem that the communication mode of the traditional controlled equipment and a monitoring center is limited, and diversifies the communication and debugging means. The monitoring system can be used for carrying out power-off and power-on operations on the 5G base station site.
According to a first aspect of the present invention, there is provided an intelligent power cabinet monitoring device, comprising:
the system comprises an FSU moving loop module, a monitoring center cloud platform, a shunt control panel, a local monitoring module and a rectification module; wherein,
the FSU moving ring module is respectively connected with the monitoring center cloud platform and the local monitoring module, and the local monitoring module is also respectively connected with the local monitoring liquid crystal screen and the shunt control panel.
Further, the shunt circuit control board is also connected with a rectification module.
Further, the FSU moving ring module is also respectively connected with a WiFi module, a 4G/NB module and a Bluetooth module.
Further, the FSU moving ring module comprises: the direct current/direct current voltage regulating unit (1) is electrically connected with a direct current power supply of the base station and is used for outputting the direct current power supply after voltage regulation; the charging and discharging management unit (2) is electrically connected with the direct current/direct current voltage regulating unit (1) and is used for receiving the power output of the direct current/direct current voltage regulating unit (1); and a battery unit (3) which is connected with the charging and discharging management unit (2) and performs charging input and discharging output under the control of the charging and discharging management unit (2).
Further, the direct current/direct current voltage regulating unit (1) adopts a direct current/direct current voltage reduction power panel.
Furthermore, the direct current/direct current step-down power panel adopts an isolation transformer.
Further, the battery unit (3) is formed by connecting a plurality of lithium iron phosphate batteries in series.
Further, the lithium iron phosphate battery contains a BMS battery protection board.
Furthermore, a jack is fixedly mounted in the middle of the shunt control panel, a power supply positive pole is arranged on one side of the jack, and mounting holes are formed in the two ends of the shunt control panel.
According to a second aspect of the present invention, there is provided a monitoring method of the power supply monitoring system according to any one of the first aspects, comprising:
firstly, clicking remote control, filling data and clicking confirmation in a monitoring center cloud platform;
then, the FSU receives the network management command, judges whether the command is correct, organizes the corresponding A interface data if the command is correct, and the serial port sends the data to the power supply equipment;
after receiving the command, the power supply equipment judges whether the command is correct, if so, the power supply equipment executes the control command, judges whether the execution is correct, and then responds the control command to the FSU;
after receiving the serial port response, the FSU judges whether the execution is correct or not, and responds a network management command to the monitoring center cloud platform;
and finally, the monitoring center cloud platform presents the execution result of the control command.
The invention has the advantages that:
1. relevant parameters and set parameters are checked in various debugging and testing modes (mobile phone APP, WIFI, 485 and 4G \ NB-IOT controllers), and remote operation and maintenance are more convenient.
2. The system integrates the FSU moving ring monitoring module, can be directly butted with a monitoring center energy platform, realizes independent monitoring, and solves the problem that outdoor application scenes are inconvenient to monitor.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a schematic diagram of a power cabinet monitoring device in the prior art.
Fig. 2 is a schematic diagram illustrating an intelligent power cabinet monitoring device according to embodiment 1 of the present invention.
Fig. 3 is a circuit diagram showing an FSU moving-loop module according to embodiment 1 of the present invention.
Fig. 4 is a schematic diagram showing a shunt control board according to embodiment 1 of the present invention.
Fig. 5 shows a flow chart of the operation of an intelligent power cabinet monitoring device according to embodiments 1 to 3 of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Example 1
As shown in fig. 2, according to embodiment 1 of the present invention, an intelligent power cabinet monitoring device is provided, including:
the system comprises an FSU (frequency selective unit) dynamic loop module, a monitoring center cloud platform, a shunt control panel (also called shunt control panel in some documents), a local monitoring module and a rectification module; wherein,
the FSU moving ring module is respectively connected with the monitoring center cloud platform and the local monitoring module, and the local monitoring module is also respectively connected with the local monitoring liquid crystal screen and the shunt control panel. The shunt circuit control board is also connected with a rectification module.
The FSU moving ring module is also connected with the WiFi module, the 4G/NB module and the Bluetooth module respectively.
Fig. 3 is a block diagram showing an FSU moving loop module according to embodiment 1 of the present invention. The charging and discharging management system comprises a direct current/direct current voltage regulating unit 1, a charging and discharging management unit 2 and a battery unit 3; the concrete structure is as follows:
the direct current/direct current voltage regulating unit 1 is a direct current/direct current voltage reducing power panel, is electrically connected with a direct current power supply of a base station, and is used for outputting the direct current power supply after voltage regulation; the power supply input from a base station-48V direct current power supply is realized, and the output system voltage 16VDC supplies power for the local monitoring module 4 (namely, the monitoring acquisition mainboard). The DC/DC voltage reduction power panel adopts transformer isolation design output, and ensures good electrical isolation characteristics of input and output.
The charging and discharging management unit 2 is electrically connected with the direct current/direct current voltage regulating unit 1 and used for receiving the power output of the direct current/direct current voltage regulating unit 1; the charging management and the external discharging output management of the battery unit 3 are realized, and the power supply input of the charging and discharging management unit 2 is the output from the DC/DC voltage reduction power supply board.
The battery unit 3 can adopt a series combination of four lithium iron phosphate batteries, is connected with the charging and discharging management unit 2, and performs charging input and discharging output under the control of the charging and discharging management unit 2; the charge management of the battery unit 3 realizes setting of the charge voltage of the battery and limitation of the charge current. The current set charging cut-off voltage is 3.8V/single section, the charging electric quantity is controlled to be 65% -75% of the full capacity, and the service life of the lithium battery can be prolonged. The charging current is limited below 500mA, and the output current allowance of external load discharging is guaranteed. In addition, lithium iron phosphate battery contains BMS battery protection shield, realizes overcurrent protection, short-circuit protection, undervoltage protection to battery itself. The battery unit is fixed in the shell of the movable ring monitoring FSU device.
The local monitoring module is connected with the charging and discharging management unit 2, receives the power output of the charging and discharging management unit 2, and is used for collecting and monitoring power environment data of a base station and outputting alarm information. The power environment data acquisition and transmission function of the base station is realized, the data acquisition and monitoring of various sensors of the base station are realized, various alarm data of the base station are analyzed in real time, and the alarm data are transmitted to a network management platform of an iron tower through wireless communication transmission or wired communication transmission to be presented. The interface of the local monitoring module comprises an analog AI input interface, a digital DI input interface, a digital output DO interface, a serial port communication interface, a storage battery voltage acquisition interface, a LAN wired communication interface and a USB HOST interface.
Fig. 4 is a schematic diagram showing a shunt control board according to embodiment 1 of the present invention.
The middle of the shunt control panel 5 is fixedly provided with a jack 6, one side of the jack 6 is provided with a power positive pole 8, and two ends of the shunt control panel 5 are provided with mounting holes 7.
Fig. 5 shows a flowchart of an operation of an intelligent power cabinet monitoring device according to embodiment 1 of the present invention.
Firstly, clicking remote control, filling data and clicking confirmation in a monitoring center cloud platform;
then, the FSU receives the network management command, judges whether the command is correct, organizes the corresponding A interface data if the command is correct, and the serial port sends the data to the power supply equipment;
after the power supply equipment receives the command, judging whether the command is correct, if so, executing the control command, judging whether the execution is correct, and responding the control command to the FSU;
after receiving the serial port response, the FSU judges whether the execution is correct or not, and responds a network management command to the monitoring center cloud platform;
and finally, presenting a control command execution result by the monitoring center cloud platform.
The intelligent power cabinet monitoring equipment has the following functions:
1. the local LCD screen displays related information, and local viewing and parameter setting can be realized through keys.
And the local LCD display screen displays the current alternating current input voltage, the current input, the direct current output voltage, the total output current and the temperature and humidity value of the box body.
Can carry out parameter setting through equipment LCD screen:
(1) the alternating-to-direct output voltage value and the battery charging current value can be set.
(2) A battery under-voltage alarm threshold, an ac input voltage over-high alarm threshold, an ac input voltage under-low alarm threshold, a dc output voltage over-high alarm threshold, and a dc output voltage under-low alarm threshold may be set.
(3) And each output branch circuit and the household standby power output control can be set. (differential power supply function)
2. And local RS485 communication mode, local checking and parameter setting can be realized through local monitoring software.
3. And the remote cloud platform is connected in a 4G and NB mode, so that remote checking and parameter setting are realized.
4. Local monitoring is realized through a WIFI mode, and local viewing and parameter setting are realized; and the remote cloud platform is connected in a WIFI mode, so that remote checking and parameter setting are realized.
5. Through the bluetooth mode, realize local control and realize local looking over, parameter setting.
It should be noted that:
in the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the invention and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the devices in an embodiment may be adaptively changed and arranged in one or more devices different from the embodiment. The modules or units or components in the embodiments may be combined into one module or unit or component, and furthermore, may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Moreover, those skilled in the art will appreciate that although some embodiments described herein include some features included in other embodiments, not others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several systems, several of these systems may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. An intelligent power cabinet supervisory equipment, which includes:
the system comprises an FSU moving loop module, a monitoring center cloud platform, a shunt control panel, a local monitoring module and a rectification module; wherein,
the FSU moving ring module is respectively connected with the monitoring center cloud platform and the local monitoring module, and the local monitoring module is also respectively connected with the local monitoring liquid crystal screen and the shunt control panel.
2. The intelligent power cabinet monitoring device of claim 1,
the shunt circuit control board is also connected with a rectification module.
3. The intelligent power cabinet monitoring device of claim 1,
the FSU moving ring module is further connected with a WiFi module, a 4G/NB module and a Bluetooth module respectively.
4. The intelligent power cabinet monitoring device of claim 1,
the FSU moving ring module comprises: the direct current/direct current voltage regulating unit (1) is electrically connected with a direct current power supply of the base station and is used for outputting the direct current power supply after voltage regulation; the charging and discharging management unit (2) is electrically connected with the direct current/direct current voltage regulating unit (1) and is used for receiving the power output of the direct current/direct current voltage regulating unit (1); and a battery unit (3) connected to the charge/discharge management unit (2) and configured to perform charge input and discharge output under the control of the charge/discharge management unit (2).
5. The intelligent power cabinet monitoring device according to claim 4, wherein the DC/DC voltage regulating unit (1) adopts a DC/DC voltage reduction power panel.
6. The intelligent power cabinet monitoring device of claim 5, wherein the DC/DC step-down power panel employs an isolation transformer.
7. Intelligent power cabinet monitoring device according to claim 4, characterized in that the battery unit (3) consists of a plurality of lithium iron phosphate batteries connected in series.
8. The intelligent power cabinet monitoring device according to claim 7, wherein the lithium iron phosphate battery comprises a BMS battery protection board.
9. The intelligent power cabinet monitoring device according to claim 5, wherein a jack is fixedly installed in the middle of the shunt control board, a power positive post is disposed on one side of the jack, and mounting holes are disposed at both ends of the shunt control board.
10. A monitoring method of a power supply monitoring system according to any one of claims 1 to 9, comprising:
firstly, clicking remote control, filling data and clicking confirmation in a monitoring center cloud platform;
then, the FSU receives the network management command, judges whether the command is correct, organizes the corresponding A interface data if the command is correct, and the serial port sends the data to the power supply equipment;
after the power supply equipment receives the command, judging whether the command is correct, if so, executing the control command, judging whether the execution is correct, and responding the control command to the FSU;
after receiving the serial port response, the FSU judges whether the execution is correct or not, and responds a network management command to the monitoring center cloud platform;
and finally, the monitoring center cloud platform presents the execution result of the control command.
CN202210502230.2A 2022-05-10 2022-05-10 Intelligent power cabinet supervisory equipment Pending CN114928160A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210502230.2A CN114928160A (en) 2022-05-10 2022-05-10 Intelligent power cabinet supervisory equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210502230.2A CN114928160A (en) 2022-05-10 2022-05-10 Intelligent power cabinet supervisory equipment

Publications (1)

Publication Number Publication Date
CN114928160A true CN114928160A (en) 2022-08-19

Family

ID=82807768

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210502230.2A Pending CN114928160A (en) 2022-05-10 2022-05-10 Intelligent power cabinet supervisory equipment

Country Status (1)

Country Link
CN (1) CN114928160A (en)

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