CN110888538B - KVM switching circuit and switcher - Google Patents
KVM switching circuit and switcher Download PDFInfo
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- CN110888538B CN110888538B CN201911078268.6A CN201911078268A CN110888538B CN 110888538 B CN110888538 B CN 110888538B CN 201911078268 A CN201911078268 A CN 201911078268A CN 110888538 B CN110888538 B CN 110888538B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/023—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
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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
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The invention relates to the technical field of electronic circuits, in particular to a KVM (keyboard video mouse) switching circuit and a switcher, wherein the switching circuit comprises a plurality of Type-C connectors, a CC (communication control) module, a signal switching/synchronizing module, at least two input equipment interfaces and a plurality of communication interfaces of different types; the Type-C connector is used for connecting the host equipment to realize bidirectional communication between the signal switching/synchronizing module and the host equipment; the input equipment interface is used for connecting input equipment, and the signal switching/synchronizing module can detect a control signal of the input equipment through the input equipment interface; the signal switching/synchronizing module is used for obtaining a mixed signal output by the host equipment according to the communication connection between the control signal and the corresponding host equipment, and separating the mixed signal to obtain various communication signals of different types. The utility model provides a KVM switching circuit adopts a Type-C interface can realize the multichannel signal output of host equipment, has reduced the manufacturing cost of KVM circuit, adopt a Type C line can, practiced thrift cable manufacturing cost.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a KVM switching circuit and a switcher.
Background
KVM is an english abbreviation of Keyboard (Keyboard), video display (Video), and Mouse (Mouse), which allows a user to switch between multiple hosts of different operating systems through one or more sets of Keyboard, display, and Mouse connected to KVM, and enables the user to access and control 2, 4, 8, 16, or even more than 4096 computer hosts using one set of Keyboard, display, and Mouse, and the switching manner can be operated through Keyboard buttons, hot-keys, and on-screen menus. If a user needs to switch operation among different computers, the user needs to connect a mouse and a keyboard to different computers respectively to complete the operation, which causes inconvenience and low efficiency when the user operates multiple computers. And the mouse and the keyboard are switched among a plurality of computers, so that the operation cannot be synchronously realized.
The existing KVM switch is provided with a plurality of groups of interfaces for connecting a plurality of host devices simultaneously, and each group of interfaces includes several types of interfaces, such as a communication interface, a power supply interface, a USB interface, and the like. Meanwhile, a large number of cables are needed when the host equipment is connected, the workload of cable connection is increased, and a plurality of cables are needed, so that the production cost is increased.
Disclosure of Invention
The technical problem to be solved by the present invention is to reduce the number of interfaces of the KVM switch.
A KVM switch circuit, comprising: the device comprises a plurality of Type-C connectors, a CC control module, a signal switching/synchronizing module, at least two input equipment interfaces and a plurality of different types of communication interfaces;
each Type-C connector is respectively connected with the CC control module and the signal switching/synchronizing module, the input equipment interface is connected with the signal switching/synchronizing module, and the communication interface is connected with the signal switching/synchronizing module;
the Type-C connector is used for connecting host equipment to realize bidirectional communication between the signal switching/synchronizing module and the host equipment;
the input device interface is used for connecting an input device, and the signal switching/synchronizing module can detect a control signal of the input device through the input device interface;
the signal switching/synchronizing module is used for acquiring a mixed signal output by the host equipment according to the communication connection between the control signal and the corresponding host equipment, and separating the mixed signal to obtain various different types of communication signals;
the plurality of communication interfaces are respectively used for connecting different communication devices and transmitting the plurality of different types of communication signals to different communication devices;
and the CC control module is used for controlling the corresponding Type-C connector to be in communication connection with the host equipment according to the control signal.
Further, the system also comprises a network module;
the plurality of communication interfaces comprise a network interface which is used for connecting the internet;
the network module is respectively connected with the network interface and the signal switching/synchronizing module, and is used for performing protocol conversion on the internet data acquired through the network interface and the communication signal output by the signal switching/synchronizing module so as to realize bidirectional communication between the host equipment and the internet.
The system further comprises a video conversion module, wherein the plurality of communication interfaces comprise a video interface used for connecting with a video playing device;
the video conversion module is respectively connected with the video interface and the signal switching/synchronizing module and is used for carrying out protocol conversion on the signals which are output by the signal switching/synchronizing module and related to the video information and converting the signals into video communication signals.
The system further comprises a storage module, wherein the plurality of communication interfaces comprise a storage interface used for connecting storage equipment;
the storage module is connected with the storage interface and the signal switching/synchronizing module and is used for identifying a communication protocol of storage equipment externally connected with the storage interface and carrying out protocol conversion on data to be stored output by the signal switching/synchronizing module and the storage data in the storage equipment so as to realize bidirectional communication between the storage equipment and host equipment.
Wherein, at least one USB interface is included in the plurality of communication interfaces and is used for connecting the equipment of the USB interface.
The CC control module is also used for establishing power supply connection with accessed host equipment, so that the host equipment provides power supply current for the power supply module, and the power supply module is used for converting the power supply current into multi-path power supply electronic current and providing matched electric energy for the switching circuit.
The CC control module is connected with the power supply module, and the CC control module is connected with the power supply module through the external power supply interface;
the CC control module is also used for detecting whether the external power supply interface has power supply access, and if so, the CC control module controls the power supply module to convert the power supply current input by the external power supply into multi-path power supply electronic current for providing matched electric energy for the switching circuit.
Further, still include the HUB, the HUB with signal switching/synchronization module electricity is connected, memory module, USB interface and network module all with the HUB is connected.
The audio module is connected with the HUB and used for carrying out protocol conversion on the signals which are output by the signal switching/synchronizing module and related to the audio information and converting the signals into audio communication signals;
the plurality of communication interfaces comprise an audio interface connected with the audio module and used for connecting audio playing equipment.
The input equipment interface at least comprises a USB keyboard interface and a USB mouse interface.
A KVM switcher comprises a shell and a circuit board arranged in the shell, wherein the circuit board is provided with the switching circuit.
The KVM switch circuit according to the above embodiment includes a plurality of Type-C connectors, a CC control module, a signal switching and synchronizing module, at least two input device interfaces, and a plurality of different types of communication interfaces. Wherein, type-C connects and is used for connecting the two-way communication between host computer equipment in order to realize signal switching/synchronous module and the host computer equipment, and Type C interface supports USB data, DP video, the power supply of PD 100W, can realize adopting a Type C line to connect host computer equipment, reaches multi-functional output's purpose. The input equipment interface is used for connecting input equipment, and the signal switching/synchronizing module can detect a control signal of the input equipment through the input equipment interface; the signal switching/synchronizing module is used for obtaining a mixed signal output by the host equipment according to the communication connection between the control signal and the corresponding host equipment, and separating the mixed signal to obtain various communication signals of different types. The plurality of communication interfaces are respectively used for connecting different communication devices and transmitting various different types of communication signals to the different communication devices; and the CC control module is used for controlling the corresponding Type-C connector to be in communication connection with the host equipment according to the control signal. The KVM switch circuit of this embodiment adopts a Type-C interface can realize the multichannel signal output of host computer equipment, has reduced the manufacturing cost of KVM circuit, and what correspond adopts a Type C line when connecting every host computer equipment can, reduced the work load of connecting the cable, need not adopt many cables simultaneously, practiced thrift the cost.
Drawings
FIG. 1 is a schematic diagram of a KVM switch circuit according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the described features, operations, or characteristics may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
In the embodiment of the invention, one Type-C interface is adopted to realize multi-path signal output of the host equipment, and the mixed signal output by the host equipment through the Type-C interface is separated through the signal switching/synchronizing module to obtain various different types of communication signals, so that the KVM circuit only needs to be provided with one Type-C interface, the production cost of the KVM circuit is reduced, correspondingly, one Type C is adopted when each host equipment is connected, the workload of connecting cables is reduced, and meanwhile, a plurality of cables are not required to be adopted, and the cost is saved.
The first embodiment is as follows:
referring to fig. 1, the present embodiment provides a KVM switch circuit, which includes a plurality of Type-C connectors 3, a CC control module 6, a signal switching/synchronization module 7, two input device interfaces, and a plurality of different types of communication interfaces. Wherein, every Type-C connects and switches/synchronous module with CC control module and signal respectively and is connected, and the input device interface is switched/synchronous module with the signal and is connected, and communication interface switches/synchronous module with the signal and is connected.
Type-C connects and is used for connecting host computer equipment 1 in order to realize the signal switch/the both-way communication between synchronous module and the host computer equipment, and the Type C interface supports USB data, DP video, the power supply of PD 100W, can realize adopting a Type C line to connect host computer equipment, reaches multi-functional output's purpose.
The input device interface of this embodiment is used for connecting an input device, and includes a USB keyboard interface 17 and a USB mouse interface 18, the USB keyboard interface 17 and the USB mouse interface 18 are respectively connected with a keyboard and a mouse, and input a control signal to the signal switching/synchronizing module 7 through the keyboard and the mouse, and the signal switching/synchronizing module 7 can be in communication connection with the input device through the input device interface to receive the control signal of the input device.
The signal switching/synchronizing module 7 is configured to perform communication connection with the corresponding host device 1 according to control signals input by the keyboard and the mouse, acquire a mixed signal output by the host device 1, and separate the mixed signal to obtain a plurality of different types of communication signals. The mixed signal output through the Type C interface includes USB data, DP video, PD 100W power supply, and the like, and the signal switching/synchronizing module 7 separates USB related data, video related information, and power related data from the mixed signal according to a preset method, thereby realizing conversion of one-path mixed signal into multiple output signals of different types. How to separate the mixed signal into multiple output signals of different types is achieved by the prior art, and is not described herein again.
Wherein, CC control module 6 is used for according to establishing communication connection between the Type-C that control signal control corresponds connects and the host computer equipment. The Configuration Channel (CC) is a key Channel newly added in the USB Type-C and has the functions of detecting USB connection, detecting positive and negative insertion, establishing and managing connection between USB equipment data and VBUS and the like. The CC control module of this embodiment is mainly used to control the communication and communication establishment of a protocol between the host device and the Type-C connector, for example, after the CC control module communicates with the host device and establishes a communication connection, the host device outputs a power supply through the Type-C connector to supply power to the entire switching circuit, or outputs a USB signal and a video signal.
The KVM switching circuit of this embodiment adopts a Type-C interface can realize the multichannel signal output of host computer equipment, has reduced the manufacturing cost of KVM circuit, and what correspond adopts a Type C when connecting every host computer equipment can, reduced the work load of connecting the cable, need not adopt many cables simultaneously, practiced thrift the cost.
The plurality of communication interfaces are respectively used for connecting different communication devices, such as a video playing device and a storage device, and a plurality of different types of communication signals are transmitted to the different communication devices through the plurality of different types of communication interfaces. Meanwhile, by inputting a control signal through the keyboard and the mouse of the embodiment, the signal switching/synchronizing module 7 may switch to a different host device 1 according to the control signal, and communicate with the corresponding host device. Therefore, the control of a plurality of devices can be realized by adopting a group of keyboard, display and mouse, and the remote control system plays an important role in remote scheduling and monitoring. The KVM technology can send various data materials in a scheduling information network to a remote terminal, providing convenience for a next-level scheduling mechanism, and thus, even if a subordinate scheduling mechanism does not establish a scheduling data network, information sharing can be achieved. The KVM switch (KVM) uses a multi-host switching technology as a basis to complete the switching among a plurality of servers by means of a group of keyboard, mouse and display, thereby saving space, reducing cost, making management easier and more convenient and improving work efficiency.
Wherein, because take the ultra-thin no integrated wired network card function of Type C computer, use WIFI probably unstablely or easily disturbed, the KVM switch circuit of this embodiment still includes network module 9, includes a network interface 14 among a plurality of communication interfaces, and this network interface 14 is RJ45 network interface, and it is used for connecting the internet. The network module 9 is respectively connected to the network interface 14 and the signal switching/synchronizing module 7, and is configured to perform protocol conversion on the internet data acquired through the network interface 14 and the communication signal output by the signal switching/synchronizing module 7, so as to implement bidirectional communication between the host device 1 and the internet.
Further, the KVM switch circuit of this embodiment further includes a video conversion module 8, and the plurality of communication interfaces includes a video interface 13, where the video interface 13 is used for connecting to a video playing device, such as a display screen. The video conversion module 8 is respectively connected to the video interface and the signal switching/synchronizing module, and is configured to perform protocol conversion on the signal related to the video information output by the signal switching/synchronizing module 7, convert the signal into a video communication signal, for example, into a signal of HDMI/DP/VGA/AV type, and the display can directly display the converted signals.
Further, the KVM switch circuit further includes a storage module, and the plurality of communication interfaces include a storage interface 16, where the storage interface 16 is used for connecting a storage device, such as a card reader, and being capable of recognizing and reading a storage card, such as SD/TF/CF/MS/XD/MMC/SATA/m.2/CF Express. The storage module 11 is connected to the storage interface 10 and the signal switching/synchronizing module 7, and is configured to identify a communication protocol of a storage device externally connected to the storage interface 16, for example, a communication protocol of a communication signal of a card reader, and then the storage module 11 performs protocol conversion on data to be stored output by the signal switching/synchronizing module 7 and stored data in the storage device (for example, an SD card) to implement bidirectional communication between the storage device and the host device 1. This can control the currently operating host device 1 to read data information in the storage device or store information of the current host device in the storage device.
The output interface of the KVM switch circuit of this embodiment includes a USB interface 15, and the USB interface 15 is used to connect the USB interface device, but in other embodiments, several USB interfaces may be provided.
Further, this KVM switch circuit still includes power module 5, power module 5 is connected with CC control module 6, CC control module 6 still is used for passing through with the host computer equipment 1 of access and communicates, then make power module 5 establish the power supply through Type C joint and host computer equipment and be connected, make host computer equipment 1 provide supply current to power module 5, power module 5 includes the power adapter, this power module 5 is used for converting supply current into multichannel supply electron current or voltage, for example, power module 5 converts the supply current that host computer equipment output into 5V in this embodiment, 3.3V, 1.8V and 1.2V, different voltages are used for supplying power to different modules, in order to guarantee that whole switch circuit normally works.
Further, the KVM switch circuit further includes an external power interface 12, where the external power interface 12 is connected to the CC control module 6 and the power module 5; the CC control module 6 is further configured to detect whether a power supply is connected to the external power interface 12, and if yes, the CC control module 5 converts a supply current input by the external power supply into a multi-path supply electron current, so as to provide a matching electric energy to the switching circuit of this embodiment. Thus, an external power supply circuit or a power supply battery can be connected through the external power interface 12, so that power is supplied to the circuit.
In order to expand the output interface, the KVM switch circuit of this embodiment further includes a HUB (multi-port repeater) 10, where the HUB10 is a multi-port repeater, and when the HUB10 is used as a central device, even if a fault occurs on a certain line in the network, the operation of other lines is not affected. The HUB10 in this embodiment is electrically connected to the signal switching/synchronizing module 7, and the storage module 11, the USB interface 15 and the network module 9 are all connected to the HUB 15.
The switching circuit further includes an audio module 18 connected to the HUB10 for performing protocol conversion on the signal related to the audio information output from the signal switching/synchronizing module to convert it into an audio communication signal; the plurality of communication interfaces includes an audio interface 19 connected to the audio module 18 for connecting to an audio playback device.
Example two:
this embodiment provides a KVM switch, which includes a housing and a circuit board disposed in the housing, wherein the circuit board is provided with a switching circuit as in embodiment 1. This switch compares with current KVM switch, the input interface of being connected with the host computer equipment only need set up a plurality of Type C interfaces can, through a Type C line connection host computer equipment, can realize the multichannel signal output of host computer equipment, reduced the manufacturing cost of KVM switch, correspond, adopt a Type C line can when connecting every host computer equipment, reduced the work load of connecting the cable, need not adopt many cables simultaneously, practiced thrift the cost.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. Numerous simple deductions, modifications or substitutions may also be made by those skilled in the art in light of the present teachings.
Claims (8)
1. A KVM switch circuit, comprising: the device comprises a plurality of Type-C connectors, a CC control module, a signal switching/synchronizing module, at least two input equipment interfaces and a plurality of different types of communication interfaces;
each Type-C joint is respectively connected with the CC control module and the signal switching/synchronizing module, the input equipment interface is connected with the signal switching/synchronizing module, and the communication interface is connected with the signal switching/synchronizing module;
the Type-C connector is used for connecting host equipment to realize bidirectional communication between the signal switching/synchronizing module and the host equipment;
the input device interface is used for connecting an input device, and the signal switching/synchronizing module detects a control signal of the input device through the input device interface;
the signal switching/synchronizing module is used for acquiring a mixed signal output by the host equipment according to the communication connection between the control signal and the corresponding host equipment, and separating the mixed signal to obtain various different types of communication signals;
the plurality of communication interfaces are respectively used for connecting different communication devices and transmitting the plurality of different types of communication signals to different communication devices;
the CC control module is used for controlling the corresponding Type-C connector to establish communication connection with the host equipment according to the control signal;
the switching circuit further comprises a power supply module, the power supply module is connected with the CC control module, the CC control module is further used for establishing power supply connection with accessed host equipment, so that the host equipment provides power supply current for the power supply module, and the power supply module is used for converting the power supply current into multi-path power supply sub-current and providing matched electric energy for the switching circuit;
the switching circuit also comprises an external power supply interface, and the external power supply interface is connected with the CC control module and the power supply module;
the CC control module is also used for detecting whether the external power supply interface has power supply access, and if so, the CC control module controls the power supply module to convert the power supply current input by the external power supply into multi-path power supply electronic current for providing matched electric energy for the switching circuit.
2. The switching circuit of claim 1, further comprising a network module;
the plurality of communication interfaces comprise a network interface which is used for connecting the internet;
the network module is respectively connected with the network interface and the signal switching/synchronizing module, and is used for performing protocol conversion on the internet data acquired through the network interface and the communication signal output by the signal switching/synchronizing module so as to realize bidirectional communication between the host equipment and the internet.
3. The switching circuit according to claim 2, further comprising a video conversion module, wherein the plurality of communication interfaces includes a video interface for connecting to a video playback device;
the video conversion module is respectively connected with the video interface and the signal switching/synchronizing module and is used for carrying out protocol conversion on the signals which are output by the signal switching/synchronizing module and related to the video information and converting the signals into video communication signals.
4. The switching circuit according to claim 3, further comprising a memory module, wherein the plurality of communication interfaces includes a memory interface for connecting to a memory device;
the storage module is connected with the storage interface and the signal switching/synchronizing module and used for identifying a communication protocol of storage equipment externally connected with the storage interface and carrying out protocol conversion on data to be stored output by the signal switching/synchronizing module and the storage data in the storage equipment so as to realize bidirectional communication between the storage equipment and host equipment.
5. The switching circuit according to claim 4, wherein at least one of the plurality of communication interfaces comprises a USB interface for connecting devices of the USB interface.
6. The switching circuit according to claim 5, further comprising a HUB electrically connected to the signal switching/synchronizing module, the memory module, USB interface and network module all connected to the HUB;
the audio module is connected with the HUB and used for carrying out protocol conversion on the signals which are output by the signal switching/synchronizing module and related to the audio information and converting the signals into audio communication signals;
the plurality of communication interfaces comprise an audio interface connected with the audio module and used for connecting audio playing equipment.
7. The switching circuit of claim 1, wherein the input device interface comprises at least a USB keyboard interface and a USB mouse interface.
8. A KVM switch comprising a housing and a circuit board arranged in said housing, wherein said circuit board is provided with a switching circuit according to any one of claims 1 to 7.
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| CN111324565A (en) * | 2020-03-19 | 2020-06-23 | 深圳源诚技术有限公司 | Multi-path USB interface switching system and method |
| CN113868183A (en) * | 2021-09-30 | 2021-12-31 | 联想(北京)有限公司 | External device, electronic device and power supply control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109308124A (en) * | 2017-07-26 | 2019-02-05 | 刘清钧 | The adaptive KVM switcher of mouse-keyboard |
| CN209297282U (en) * | 2018-12-26 | 2019-08-23 | 南京神易网络科技有限公司 | A kind of device for supporting mobile phone and PC to switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109308124A (en) * | 2017-07-26 | 2019-02-05 | 刘清钧 | The adaptive KVM switcher of mouse-keyboard |
| CN209297282U (en) * | 2018-12-26 | 2019-08-23 | 南京神易网络科技有限公司 | A kind of device for supporting mobile phone and PC to switch |
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Address after: 518109 1st-6th floor, 1st floor, 6th floor, No.7 office building, yuan plant area, Longcheng industry and trade, Gaofeng community, Dalang street, Longhua District, Shenzhen, Guangdong Province Applicant after: Shenzhen lvlian Technology Co.,Ltd. Address before: 518109 1st-6th floor, 1st floor, 6th floor, No.7 office building, yuan plant area, Longcheng industry and trade, Gaofeng community, Dalang street, Longhua District, Shenzhen, Guangdong Province Applicant before: SHENZHEN GREEN CONNECTION TECHNOLOGY Co.,Ltd. |
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