KR101678556B1 - Apparatus for control multiple access of USB device - Google Patents

Apparatus for control multiple access of USB device Download PDF

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Publication number
KR101678556B1
KR101678556B1 KR1020150105117A KR20150105117A KR101678556B1 KR 101678556 B1 KR101678556 B1 KR 101678556B1 KR 1020150105117 A KR1020150105117 A KR 1020150105117A KR 20150105117 A KR20150105117 A KR 20150105117A KR 101678556 B1 KR101678556 B1 KR 101678556B1
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South Korea
Prior art keywords
usb
usb device
host
connection
data
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Application number
KR1020150105117A
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Korean (ko)
Inventor
노명길
이영훈
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(주)스마트엑세스
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/382—Information transfer, e.g. on bus using universal interface adapter
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/40—Bus structure
    • G06F13/4063—Device-to-bus coupling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F2213/0042—Universal serial bus [USB]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F2213/38—Universal adapter
    • G06F2213/3812—USB port controller

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Information Transfer Systems (AREA)

Abstract

The present invention relates to a device for controlling multiple access of a USB device. The device for controlling the multiple access of the USB device comprises: a data line which transmits/receives a data signal to the USB device connected to a USB port; a power line which supplies power to the USB device; a control unit which charges the USB device through the power line according to the number of connected USB devices, and/or controls a connection state of the USB device to transmit and receive the data signal between the USB device and a host through the data line; and a communication unit which transmits and receives a control signal between the control unit and the host. The present invention dynamically controls connection of the USB device according to necessity. Even though the USB device is physically connected to the USB host through a cable, the USB device, which is not necessary right now, is provided to be recognized in the USB host, thereby preventing a malfunction of the USB host.

Description

 [0001] The present invention relates to a USB multiple access control device,

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling connection of a USB device, and more particularly, to an apparatus for controlling connection of a USB device in accordance with a determined number of connections.

BACKGROUND ART [0002] Recently, a high-speed serial transmission method using USB has been required in information transmission and reception between devices. USB is an industry standard data bus standard that can be used to transfer digital data between a USB hub and a USB host / device. The USB hose can supply power to a USB device and can send and receive data at a higher serial speed.

In recent years, an interface device using a high-speed serial transmission method according to the USB (Universal Serial Bus) 3.O has been commercialized. USB 3.0 realizes a data transmission speed of up to 5Gbps for a maximum of 480Mbps of the previous version of USB 2.0 have.

However, when connecting multiple USB devices to a USB port supporting USB 3.0, if the number of connected devices exceeds a certain number, there is a problem in operation. If more than the permitted number of USB devices are connected, it informs that the number of usable devices exceeds the maximum allowable value or notifies that the connection is impossible through the message that the device has failed to operate.

That is, when a USB device is connected to a USB host, the SW system of the USB host automatically recognizes the connection. Since USB host has a limit on the number of external USB devices that can be connected in general, when connecting more than a certain number, the host system will not properly support it.

In the past, there has been no alternative but to disconnect some USB devices when such a situation occurs. This problem is presumed to be a driver problem of the USB host, and in an industrial field where a plurality of USB devices are connected to a host, This is a situation where technology is required to manage and control.

 It is an object of the present invention to provide an apparatus for controlling connection of a USB device in a system without a user physically detaching the USB device.

An object of the present invention is to provide a device for controlling the connection mode of a physically connected USB device and maintaining the number of connections of the USB device equal to or less than the determined connection allowable number.

According to an aspect of the present invention, there is provided a USB multiple access control apparatus including: a data line for transmitting and receiving a data signal to and from a USB device connected to a USB port; A power supply line for supplying power to the USB device; The connection state of the USB device is controlled so that the USB device can be charged through the power line and / or the data signal can be transmitted / received between the USB device and the host via the data line according to the number of the connected USB devices A control unit; And a communication unit for transmitting / receiving a control signal between the control unit and the host.

The control unit includes a charge control IC for controlling the connection state to a charge mode for charging the USB device or a data transfer mode for charging the USB device and transmitting and receiving the data signal.

Wherein the charging control IC includes a current sensing sensor for sensing a current value of power supplied to the USB device in the charging mode, and the controller compares the current value with a predetermined threshold value to determine whether the USB device is connected It is preferable to judge.

The threshold value is preferably determined according to the USB device.

Preferably, the controller generates connection information for a plurality of USB ports determined to be connected to the USB device, and the USB port displays a connection status of the USB device through a light emitting device.

The communication unit receives selection information of a USB device to transmit a data signal to the USB device determined to be connected from the host, and transmits the selection information to the control signal of the control unit. It is preferable to switch the connection state from the charging mode to the data transmission mode.

Wherein the communication unit receives a connection release signal for the USB device from which the transmission of the data signal has been completed from the host, and transmits the connection release signal to the control unit, wherein the control unit controls the connection status of the USB device according to the control signal It is preferable to switch from the data transfer mode to the charge mode.

 According to the present invention, the connection of the USB device can be dynamically controlled as needed. That is, even if the USB device is physically connected to the USB host through a cable, it is possible to prevent the USB host from malfunctioning by not allowing the USB host to recognize a USB device that is not needed immediately.

1 is a diagram illustrating a system to which a USB multiple access control apparatus according to an embodiment of the present invention is applied.
2 is a diagram illustrating a USB multiple access control apparatus according to an embodiment of the present invention.
3 is a diagram illustrating a USB multiple access control apparatus according to an embodiment of the present invention in more detail.
4 and 5 are flowcharts illustrating a method of controlling a USB multiple access control apparatus according to an embodiment of the present invention.

The following merely illustrates the principles of the invention. Therefore, those skilled in the art will be able to devise various apparatuses which, although not explicitly described or shown herein, embody the principles of the invention and are included in the concept and scope of the invention. It is also to be understood that all conditional terms and examples recited in this specification are, in principle, expressly intended for the purpose of enabling the inventive concept to be understood, and are not intended to be limiting as to such specifically recited embodiments and conditions .

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: .

In the following description, a detailed description of known technologies related to the present invention will be omitted when it is determined that the gist of the present invention may be unnecessarily blurred. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a system to which a USB multiple access control apparatus 100 according to an embodiment of the present invention is applied.

1, the system according to the present embodiment includes a host 10, a USB multiple access control apparatus 100, a USB port 20, and a USB device 30.

In this embodiment, the host 10 is the opposite of the USB device 30 to which it is connected, and generally the PC serves as the USB host 10. That is, it manages a USB connected as a user device such as a PC, and plays a role of transmitting and receiving data.

In addition, the host 10 may include not only a physical device but also an OS or SW installed in a user device such as a PC. That is, a hardware device and a software device that control and manage the USB device 30 to be connected.

In the present embodiment, the USB multiple access control apparatus 100 is configured between a USB device 30 connected to the host 10 as a device for controlling and managing a specific USB connection. This will be described in more detail with reference to FIG.

The USB port 20 is a connection unit that is exposed to the outside from the host 10 and refers to a physical configuration in which the actual USB device 30 is connected directly or via a cable.

The USB device 30 is physically connected to the host 10 via the USB port 20 to transmit and receive data. Further, it is also possible to supply power through the USB port 20 and to charge the battery through the USB port 20.

The host 10 according to the present embodiment may include a plurality of USB ports 20. That is, the host 10 can be connected to the plurality of USB devices 30 at the same time through the plurality of USB ports 20.

In this case, when a plurality of USB devices 30 are connected to the USB port 20 supporting USB 3.0, the USB host 10 generally limits the number of external USB devices that can be connected If the number of connected devices exceeds a certain number, a problem occurs in operation.

That is, the USB multiple access control apparatus 100 (hereinafter, the connection control apparatus 100) according to the present embodiment controls the USB device connection in the system without physically detaching the USB device 30, The number of connections of the USB device 30 that is equal to or smaller than the permissible number is maintained.

Hereinafter, the connection control apparatus 100 according to the present embodiment will be described with reference to FIG.

2, the connection control apparatus 100 according to the present embodiment includes a communication unit 110, a control unit 120, a power supply line 140, and a data line 130.

In this embodiment, the communication unit 110 transmits / receives a control signal between the control unit 120 and the host 10.

The control unit 120 itself can only control the USB device 30 through the USB port 20 and does not have a function of directly communicating with the host 10. In this embodiment, The apparatus 100 includes a communication unit 110.

In this embodiment, the communication unit 110 may be integrated with a SoC (System on Chip), which is connected to a plurality of unit control units 120 so that communication control is possible.

The communication unit 110 does not have a function of directly performing USB communication inside the chip, but is capable of communicating with the USB host 10 through the USB conversion chip. Therefore, the communication unit 110 can mediate communication between the USB host 10 and the control unit 120. [

That is, the PC synchronization software as the host 10 can control the charging port 20 by communicating with the communication unit 110, and also can read the connection information of the USB port 20. [ Furthermore, the existing USB cable can be used without any separate connection between the device (for example, tablet PC charging) to which the connection control apparatus 100 according to the present embodiment is applied (for example, tablet PC charging) .

The control unit 120 controls the charging of the USB device 30 through the power line 140 and / or the charging of the USB device 30 through the data line 130 according to the number of the connected USB devices 30. [ And controls the connection state of the USB device (30) so that data signals can be transmitted and received between the host (10).

First, in the present embodiment, the connection means that the USB device 30 is physically connected to the USB port 20, and can be distinguished from software recognizing the connection in the USB hub or the USB host 10 system.

The control unit 120 controls the data line 130 and the USB device 30 to transmit and receive data signals to and from the USB device 30 connected to the USB port 20 according to a control signal received by the communication unit 110. [ A power supply line 140 for supplying power to the power supply line 140 is set.

The step of recognizing the USB device 30 in the general USB host 10 system can be summarized as follows. The USB hub 30 recognizes the electrical connection of the USB device 30 inserted in the specific port 20 and detects the change of the electrical signal of the data line 130 so that the next USB hub is connected to the USB device 30 Recognizes speed.

Thereafter, the USB host 10 system can acquire various kinds of information from the USB device 30 and transmit the data in the opposite manner.

That is, when a plurality of USB devices 30 are connected through a plurality of steps, a problem arises when the number of connected devices exceeds a predetermined number. In this case, the USB Host (10) system will report that the number of available devices exceeds the maximum allowed value. The user is notified of the occurrence of the problem through the message " Failed to operate the device ".

Accordingly, the connection control apparatus 100 according to the present embodiment recognizes that the USB host 10 system is not connected, while the transmission of the electrical signal of the data line 130 is blocked, Thereby solving the above-mentioned problems.

That is, by adding a switch to the data line 130 (e.g., D +, D- line) and controlling the switch, the USB host 10 system can not recognize the device. However, the VBUS power supply line 140 is not controlled among the USB signals, so that the connected USB device 30 can always be charged.

The USB BC (Battery Charging) standard defines a DCP (Dedicated Charging Port) device having only charge-only functions and a CDP (Charging Downstream Port) device supporting charging and data communication, .

That is, in the CDP device, D + and D- lines among the USB signal lines are connected to the data line 130 of the USB hub, and the DCP device is a charge-only device that does not require a USB communication function. Line is not used for USB data communication.

Hereinafter, this will be described in more detail with reference to FIG.

3, the control unit 120 of the connection control apparatus 100 according to the present embodiment includes a charging control IC 122, a current sensing IC 124, and a microcomputer 126.

That is, in the present embodiment, the charge control IC 122 recognizes the USB device 30 as a DCP device and recognizes the USB device 30 as a CDP device or a charging mode in which the USB device 30 is charged, So as to switch to a data transmission mode for transmitting and receiving data.

Therefore, the charge or data transfer mode can be controlled individually for each USB port 20, so that the same effect as that for controlling the switches individually formed on the USB data line 130 can be obtained.

In order to avoid the above-described problem of the USB 3.0 host 10, the default mode in the present embodiment is such that all the USB data line 130 switches in the system in which the connection control apparatus 100 according to the present embodiment is used are switched to the default quot; off " state.

Therefore, the default state of the charge control IC 122 becomes the charge mode.

Therefore, even if the user connects the USB device 30 (cable plug-in), the USB host 10 system does not recognize the data signal line of the USB port 20 when the data signal line is switched off.

However, if the USB device 30 is physically connected to the port 20 in order for the user to select data transmission of the corresponding USB device 30 (for example, synchronization of the tablet PC in the synchronization software) do.

Therefore, the USB host 10 system needs to recognize only the physical connection of the USB device 30 in a separate method.

Therefore, the charge control IC 122 of the control unit 120 according to the present embodiment may further include a current sensing sensor.

That is, in the present embodiment, the current sensing sensor senses the current value of the power supplied to the USB device 30 in the charging mode, and the controller 120 compares the current value with a predetermined threshold value And determines whether or not the USB device 30 is connected.

Since the USB device 30 receives a current from the USB port 20 when the USB device 30 normally operating in the USB port 20 is connected to the USB port 20, When the current sensed by the current sensing sensor exceeds a predetermined amount by using a current sensing sensor that senses a current flowing in the line 140, the software recognizes the current and determines connection of the device.

That is, the threshold used in the charge control IC 122 may be determined according to the type, capacity, power consumption, etc. of the USB device 30 to be connected. However, in the present embodiment, the main purpose of the control unit 120 is to determine only which device is connected and to confirm that the device is connected.

Thus, the threshold value is preferably determined using an amount that represents a significant current change.

The controller 120 generates connection information for a plurality of USB ports 20 that the USB device 30 is determined to be connected to and the USB port 20 is connected to the USB port 20 through the light emitting element 25. In this embodiment, The connection state of the device 30 can be displayed.

3, the controller 120 includes a microcomputer 126. The microcomputer 126 may be a microcomputer.

Accordingly, the microcomputer 126 of the present embodiment periodically checks the measurement result of the current sensor to check the connected state of the devices for each USB port 20, and generates a connection map. Also, the LED color can be controlled as a light emitting element 25 of the port 20 according to the connection state of each port 20 and displayed to the user.

If the system in which the connection control apparatus 100 according to the present embodiment is used is connected to the host 10 via the USB cable and software for transmitting and receiving data to the host 10 If the state of the connection map of the USB port 20 is changed, it is possible to inform the software of the host 10 of this fact whenever the state of the connection map of the USB port 20 is changed.

A specific method of controlling the port 20 through the communication unit 110 and the control unit 120 of the connection control apparatus 100 according to the present embodiment will now be described with reference to FIGS. 4 and 5. FIG. Hereinafter, the case where data transmission / reception to / from the USB device 30 is performed by synchronization of the USB device 30 will be described by way of example.

First, when a system in which the connection control apparatus 100 according to the present embodiment is used is connected to the host 10 (S10), a part of the USB hub and the communication unit 110 communication apparatus are recognized by the OS of the host 10. [

Next, the host 10 executes synchronization software for data transmission and reception (S20), and the synchronization software recognizes the communication device of the communication unit 110 according to the present embodiment. At this time, the synchronization software retrieves connection map information of the USB devices 30 generated by the microcomputer 126 of the control unit 120 through communication with the communication unit 110 (S30).

At this time, the synchronization software can display the connection map information of the USB device 30 to the user on the screen using the UI (S40).

That is, the user selects items to be synchronized among the 'connectable' connected devices displayed on the screen, and the user starts synchronization by pressing the start synchronization button (S50).

The communication unit 110 on the side of the connection control apparatus 100 according to the present embodiment receives the selection information of the USB device 30 to transmit the data signal to the USB device 30 judged to be connected from the host 10 (S60). The control unit 120 switches the connection state of the USB device 30 from the charge mode to the data transfer mode according to the control signal (S70).

Specifically, when the synchronization software sends a command to the communication unit 110 to actually connect some of the devices selected by the user (e.g., tablet PC), the communication unit 110 controls the USB port 20 To the control unit (s) 120 (s).

The controller 120 receives the control signal and switches the connection state from the default charging mode to the data transmission mode to turn on the USB data line 130 switch of the USB port 20 to be connected.

The USB hub 30 newly recognizes that the USB hub 30 is connected as the data line 130 of the USB device 30 is connected and the host 10 newly connects the USB device 30 through the USB hub. Lt; / RTI > After that, the synchronization software also recognizes the connection of the USB device 30 through the operating system and starts the synchronization operation of the USB device 30 (S80).

In order to release the USB device 30 after the synchronization has been completed, the communication unit 110 completes the synchronization from the host 10 (receiving the connection release signal for the USB device 30 for which the transmission of the data signal has been terminated, The control unit 120 transfers the connection state of the USB device 30 from the data transfer mode to the charge mode according to the control signal.

5, when the synchronization operation of the USB device 30 (tablet) connected to the specific port 20 is completed (S90), the synchronization software transmits the synchronization signal to the communication unit 110 via the USB port 20 Sends a command to disconnect. The communication unit 110 sends a connection release command to the control unit 120 that manages the USB port 20 (S100). The control unit 120 turns off the data line 130 of the corresponding USB port 20 as a control signal. The connection state is switched from the data transfer mode to the charge mode, which is the default mode (S110).

When the mode is switched, the USB hub and the host 10 detect that the device is disconnected. Thereafter, the synchronization software can continue synchronization with the next USB device 30 (S60).

According to the present invention as described above, the connection of the USB device 30 can be dynamically controlled as needed. That is, even if the USB device 30 is physically connected to the USB host 10 via a cable, the USB host 10 can be prevented from being recognized by the USB host 10, Can be prevented.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be.

Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (7)

A data line for transmitting and receiving a data signal to and from a USB device connected to the USB port;
A power supply line for supplying power to the USB device;
A charge control IC for controlling a connection state between the USB device and the USB port in a charge mode in which the data line is cut off and only the power line is connected or a data transfer mode in which the data line and the power line are both connected, ;
A current sensor for sensing a current value of power supplied to the USB device in the charging mode to confirm that the connection state between the USB device and the USB port is the charging mode; And
And a microcomputer for checking a connection state between the USB device and the USB port through a current value sensed by the current sensor to generate a connection map and transmitting the connection map to a host. And
And a communication unit for transmitting and receiving a control signal between the control unit and the host. delete The method according to claim 1,
Wherein the control unit compares the current value with a predetermined threshold to determine whether the USB device is connected to the USB port or not, The method of claim 3,
Wherein the threshold value is determined according to the USB device. The method of claim 3,
Wherein the controller generates connection information for a plurality of USB ports determined to be connected to the USB device,
And the USB port displays the connection status of the USB device through the light emitting device. The method of claim 3,
Wherein the communication unit receives selection information of a USB device to which a data signal is to be transmitted among the USB devices determined to be connected from the host, and transmits the selection information to a control signal of the control unit,
Wherein the control unit switches the connection status of the USB device from the charging mode to the data transmission mode according to the control signal. The method according to claim 6,
Wherein the communication unit receives a connection release signal for the USB device from which the transmission of the data signal is terminated from the host and transmits the connection release signal to the control unit,
Wherein the control unit switches the connection state of the USB device from the data transfer mode to the charge mode according to the control signal.
KR1020150105117A 2015-07-24 2015-07-24 Apparatus for control multiple access of USB device KR101678556B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020215031A1 (en) * 2019-04-18 2020-10-22 Bretford Manufacturing, Inc. Method and apparatus for controlling led operation of a storage system
US11385681B1 (en) 2020-08-05 2022-07-12 Bretford Manufacturing, Inc. Docking computer storage system

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Publication number Priority date Publication date Assignee Title
JPH03156505A (en) * 1989-11-14 1991-07-04 Fuji Electric Co Ltd Programmable controller system
JP3156505B2 (en) * 1994-05-31 2001-04-16 株式会社明電舎 Temperature sensor
JP2002281033A (en) * 2001-03-15 2002-09-27 Nec Access Technica Ltd Usb connection port display system
KR101294102B1 (en) * 2012-11-22 2013-08-08 주식회사 코리아하이텍 Rechargeable mult communication apparatus and method for controlling the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03156505A (en) * 1989-11-14 1991-07-04 Fuji Electric Co Ltd Programmable controller system
JP3156505B2 (en) * 1994-05-31 2001-04-16 株式会社明電舎 Temperature sensor
JP2002281033A (en) * 2001-03-15 2002-09-27 Nec Access Technica Ltd Usb connection port display system
KR101294102B1 (en) * 2012-11-22 2013-08-08 주식회사 코리아하이텍 Rechargeable mult communication apparatus and method for controlling the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020215031A1 (en) * 2019-04-18 2020-10-22 Bretford Manufacturing, Inc. Method and apparatus for controlling led operation of a storage system
US11481303B2 (en) 2019-04-18 2022-10-25 Bretford Manufacturing, Inc. Method and apparatus for controlling LED operation of a storage system
US11385681B1 (en) 2020-08-05 2022-07-12 Bretford Manufacturing, Inc. Docking computer storage system

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