CN105760334B - Universal serial bus hub, method for operating the same and display - Google Patents
Universal serial bus hub, method for operating the same and display Download PDFInfo
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- CN105760334B CN105760334B CN201610079220.7A CN201610079220A CN105760334B CN 105760334 B CN105760334 B CN 105760334B CN 201610079220 A CN201610079220 A CN 201610079220A CN 105760334 B CN105760334 B CN 105760334B
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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
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/325—Power saving in peripheral device
- G06F1/3253—Power saving in bus
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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
Abstract
The invention provides a universal serial bus hub, a method for operating the same and a display. When the upstream port is not occupied, or when the upstream port is occupied but all the downstream ports are not occupied, the control unit controls the USB hub to operate in the first mode. When the upstream port is occupied and at least one downstream port is occupied, the control unit controls the USB hub to operate in the second mode, wherein the power consumption of the USB hub in the first mode is lower than that in the second mode.
Description
Technical Field
The present invention relates to a universal serial bus hub, a method for operating the universal serial bus hub and a display using the universal serial bus hub, and more particularly, to a universal serial bus hub with low power consumption.
Background
Universal Serial Bus (USB) is a very popular computer interface connection standard and is a technical specification of input/output interface. Generally, a computer system provides at least one standard USB port, and any peripheral device conforming to the USB standard can be connected to any computer system having the USB standard, so as to transmit data with digital signals of the USB standard, and plug and play (PNP) is also available, i.e. various peripheral devices can be inserted at any time without being rebooted or installed. Since computer systems can only provide a limited number of USB ports, not all peripheral devices can be connected to the computer system in a one-to-one manner at the same time. Therefore, USB hubs (hubs) have been developed in the market that allow a computer system to simultaneously transmit data to multiple peripheral devices through a single USB port.
A conventional USB hub generally has an upstream port (upstream port) for connecting to a host and a plurality of downstream ports (downstream ports) for connecting to one or more peripheral devices, so that the host can maintain connection and operate with the plurality of peripheral devices through the USB hub. In order to save power consumption, the current USB communication specification determines the operation mode of the USB hub according to whether the USB hub is connected to the host. When the upstream port is occupied by the host, the USB hub will supply power to all the downstream ports to operate in the normal mode; when the upstream port is not occupied by the host, the USB hub stops supplying power to the downstream port to operate in the power-saving mode.
Typically, a user connects the USB hub to the host for a long period of time, but only inserts a peripheral device into the downstream port of the USB hub when the USB hub is to be used. In this case, when the upstream port is occupied by the host, the USB hub of the prior art continuously supplies power to the downstream port even though the host does not perform data transmission with any peripheral device, thereby increasing unnecessary power consumption of the USB hub.
Disclosure of Invention
The present invention is directed to a universal serial bus hub, a method of operating the universal serial bus hub, and a display using the universal serial bus hub, and more particularly, to a universal serial bus hub with low power consumption
To achieve the above object, a first aspect of the present invention provides a universal serial bus hub, including:
an upstream port;
a first downstream port comprising:
a first data pin and a second data pin for transmitting data to or receiving data from the device when the first downstream port is occupied by the device; and
a voltage pin and a ground pin for transmitting power to the device when the first downstream port is occupied by the device, wherein the ground pin is floating; and
a control unit coupled to the ground pins of the upstream port and the first downstream port for determining whether the upstream port and the first downstream port are occupied, when the control unit determines that the upstream port is occupied but the first downstream port is not occupied, the control unit controls the USB hub to operate in a first mode; when the control unit determines that the upstream port and the first downstream port are both occupied, the control unit controls the USB hub to operate in a second mode, wherein the power consumption of the USB hub in the first mode is lower than the power consumption of the USB hub in the second mode.
Preferably, the control unit is further configured to:
stopping supplying power to the first downstream port to control the USB hub to operate in the first mode; and
power is supplied to the first downstream port to control the USB hub to operate in the second mode.
Preferably, the control unit is further configured to:
monitoring whether the upstream port and the first downstream port are both kept occupied during the period of supplying power to the first downstream port; and
when at least one of the upstream port and the first downstream port is monitored to be unoccupied, the power supply to the first downstream port is stopped.
Preferably, the usb hub further comprises one or more second downstream ports, the one or more second downstream ports are coupled to the control unit, wherein the control unit is further configured to:
determining whether the one or more second downstream ports are occupied; and
when the upstream port is determined to be occupied and the first downstream port and the one or more second downstream ports are determined to be unoccupied, controlling the USB hub to operate in the first mode; and
when the upstream port is determined to be occupied and at least one of the one or more second downstream ports is determined to be occupied, controlling the USB hub to operate in the second mode.
Preferably, the ground pin is coupled to a bias voltage through a resistor to form a floating circuit. When the first downstream port is occupied, the grounding pin has a first potential; when the first downstream port is not occupied, the grounding pin has a second potential; and the judging circuit judges whether the first downstream port is occupied or not according to the electric potential detected from the grounding pin.
To achieve the above object, a second aspect of the present invention provides a method for operating a universal serial bus hub, the universal serial bus hub including an upstream port, a first downstream port and a control unit, the method comprising:
setting the ground pin of the first downstream port to float so that the ground pin has a first potential when the first downstream port is occupied and a second potential when the first downstream port is not occupied;
the control unit judges whether the upstream end port is occupied or not;
the control unit judges whether the first downstream port is occupied or not according to the electric potential detected from the grounding pin;
when the upstream port is occupied but the first downstream port is not occupied, the control unit controls the USB hub to operate in a first mode; and
when the upstream port and the first downstream port are both occupied, the control unit controls the universal serial bus concentrator to operate in a second mode, wherein the power consumption of the universal serial bus concentrator when operating in the first mode is lower than that when operating in the second mode.
Preferably, the method further comprises:
the control unit stops power supply to the first downstream port, and further controls the USB hub to operate in the first mode; and
the control unit allows the power to be supplied to the first downstream port, thereby controlling the USB hub to operate in the second mode.
Preferably, the method further comprises: monitoring whether the upstream port and the first downstream port are both kept occupied during the period that the power is supplied to the first downstream port; and when at least one of the upstream port and the first downstream port is monitored to be unoccupied, the control unit stops the power supply from being supplied to the downstream port.
Preferably, the usb hub further comprises one or more second downstream ports, the one or more second downstream ports being coupled to the control unit, and the method further comprises: determining whether the one or more second downstream ports are occupied; when the upstream port is determined to be occupied and the first downstream port and the one or more second downstream ports are determined to be unoccupied, controlling the USB hub to operate in the first mode; and controlling the USB hub to operate in the second mode when the upstream port is determined to be occupied and at least one of the one or more second downstream ports is determined to be occupied.
In order to achieve the above object, a third aspect of the present invention provides a display device, comprising: a screen and the universal serial bus hub of the first technical proposal.
Compared with the prior art, by implementing the invention, when the upstream port of the universal serial bus concentrator is occupied but the first downstream port is not occupied, the control unit controls the universal serial bus concentrator to operate in a first mode; when the control unit determines that the upstream port and the first downstream port are both occupied, the control unit controls the USB hub to operate in a second mode, wherein the power consumption of the USB hub in the first mode is lower than the power consumption of the USB hub in the second mode. That is, the USB hub of the present invention supplies power to the first downstream port only when the host is connected to at least one peripheral device through a Universal Serial Bus (USB) hub, thereby reducing unnecessary power consumption of the USB hub.
Drawings
FIG. 1 is a functional block diagram of a display according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of an upstream port in the USB hub according to the present invention.
FIG. 3 is a schematic diagram of a downstream port in the USB hub according to the present invention.
FIG. 4 is a flowchart illustrating operation of the control unit of the USB hub according to the present invention.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following detailed description of the embodiments is given.
FIG. 1 is a block diagram of a display 150 according to an embodiment of the present invention. The display 150 includes a screen 50 and a Universal Serial Bus (USB) hub 100. The Universal Serial Bus (USB) hub is hereinafter referred to as a USB hub. In the embodiment of the present invention, the display 150 can be any device with display function and USB standard specification. However, the type of the display 150 is not intended to limit the scope of the present invention.
The USB hub 100 comprises an upstream port UP, a control unit 10 and a plurality of downstream ports DN1～DNMWherein M is a positive integer. The USB hub 100 may be connected to a host through an upstream port UP and/or connected to a host through a downstream port DN1～DNMTo one or more peripheral devices. In the embodiment of the present invention, the USB hub 100 can be connected to any device providing at least one standard USB port through the upstream port UP. However, the type of host does not limit the scope of the present invention. In addition, the number of the downstream ports can be one.
In the embodiment of the present invention, the USB hub 100 can pass through the downstream port DN1～DNMConnect to one or more peripheral devices conforming to the USB standard, such as a printer, a microphone, a loudspeaker, a screen, a mouse, a keyboard, a mobile hard disk, or a memory card. However, the type of peripheral device does not limit the scope of the present invention.
FIG. 2 is a diagram of the upstream port UP of the USB hub 100 according to the present invention. The upstream port UP includes a first DATA pin DATA +, a second DATA pin DATA-, a voltage pin VCC and a ground pin GND. When the upstream port UP is occupied by the host, the USB hub 100 can transmit DATA to the host through the first DATA pin DATA + and the second DATA pin DATA-. The voltage pin VCC is coupled to the control unit 10, and the ground pin GND is coupled to the ground reference potential. Since the voltage pin VCC will be changed when the upstream port UP is occupied by the host, the control unit 10 can determine whether the USB hub 100 is connected to the host.
FIG. 3 shows the DN of the downstream port of the USB hub 100 according to the present invention1～DNMSchematic representation. Downstream port DN1～DNMEach including a first DATA pin (respectively composed of DATA)1+～DATAM+ represents, a second DATA pin (respectively represented by DATA)1-～DATAM-denoted, voltage pin (VCC respectively)1～VCCMIndicated by) and ground pins (each indicated by GND)1～GNDMTo indicate). When the downstream port is occupied by the peripheral device, the USB hub 100 may transmit data to or receive data from the peripheral device through the corresponding first data pin and second data pin of the associated downstream port, and transmit power to the peripheral device through the corresponding voltage pin. Each grounding pin GND1～GNDMAre coupled to the control unit 10 and are all floating so that the corresponding ground pin has a first potential when the downstream port is occupied and a second potential when the downstream port is unoccupied. Therefore, the control unit 10 can determine whether the USB hub 100 is connected to any peripheral device.
In the embodiment shown in FIG. 3, the downstream port DN1～DNMGround pin GND1～GNDMCan be coupled to a bias voltage V through a resistor RBIASTo form a floating circuit. However, the structure of the floating circuit does not limit the scope of the present invention.
The control unit 10 can control the operation mode of the USB hub 100, and fig. 4 is a flowchart illustrating the operation of the control unit 10 according to the embodiment of the present invention, which includes the following steps:
step 410: detecting the voltage level of the voltage pin VCC in the upstream port UP and the downstream port DN1～DNMMiddle grounding pin GND1～GNDMThe potential of (a); step 420 is performed.
Step 420: determining whether the upstream port UP is occupied according to the potential of the voltage pin VCC in the upstream port UP: if yes, go to step 430; if not, go to step 440.
Step 430: according to the downstream port DN1～DNMMiddle grounding pin GND1～GNDMDetermining whether at least one specific downstream port is occupied: if yes, go to step 450; if not, go to step 440.
Step 440: the USB hub is controlled to operate in the first mode, and step 410 is performed.
Step 450: the USB hub is controlled to operate in the second mode, and step 460 is performed.
Step 460: monitoring whether both the upstream port UP and a particular downstream port remain occupied? If yes, go to step 450; if not, go to step 440.
In the embodiment shown in FIG. 4, the first mode is a power saving mode, in which the USB hub 100 stops supplying power to the downstream port DN1～DNM(ii) a The second mode is a normal mode, in which the USB hub 100 supplies power to the downstream port DN1～DNM. That is, the control unit controls the usb hub to operate in the first mode (power saving mode) by stopping power supply to the first downstream port; and controlling the USB hub to operate in the second mode (normal mode) by supplying power to the first downstream port. The following table shows various scenarios in which the control unit 10 controls the operation mode of the USB hub 100.
Watch 1
In steps 410-430, when it is determined that the USB hub 100 is not connected to the host, or when it is determined that the USB hub 100 is connected to the host but not connected to any peripheral device (i.e. all downstream ports are not occupied), the present invention performs step 440 to control the USB hub 100 to operate in the first mode (power saving mode); when it is determined that the USB hub 100 is connected to the host and at least one peripheral device (i.e., at least one downstream port is occupied), the present invention performs step 450 to control the USB hub 100 to operate in the second mode (normal mode). Thus, only at the host is via the USB hub100 are connected to at least one peripheral device, the USB hub 100 of the present invention will supply power to the downstream port DN1～DNMThereby reducing unnecessary power consumption of the USB concentrator.
In addition, DN is supplied to the downstream port1～DNMMeanwhile, the present invention also periodically monitors whether the upstream port UP and at least one downstream port are both occupied in step 460. Once all downstream ports are detected to be unoccupied, the USB hub 100 proceeds to step 440 to switch to the power saving mode. Therefore, the USB hub 100 of the present invention supplies power to the downstream port DN only when the host is connected to at least one peripheral device through the USB hub 1001～DNMThereby reducing unnecessary power consumption of the USB concentrator.
The following description will be given by way of specific examples of how the control unit comprehensively controls the operation mode of a universal serial bus hub (USB hub) according to the comprehensive occupation status of a plurality of downstream ports. For example, in the present invention, the plurality of downstream ports DN can be divided into1～DNMThe number of the first downstream ports is at least one, and the number of the second downstream ports is one or more. The control unit is not only used for judging whether the first downstream port is occupied or not, but also used for judging whether one or more second downstream ports are occupied or not; and controlling the USB hub to operate in the first mode when the upstream port is determined to be occupied and the first downstream port and the one or more second downstream ports are determined to be unoccupied; and when the upstream port is determined to be occupied and at least one of the one or more second downstream ports is determined to be occupied, controlling the USB hub to operate in the second mode, i.e., no matter whether the first downstream port is occupied, as long as the upstream port is occupied and at least one second downstream port is occupied, the control unit controls the USB hub to operate in the second mode (normal mode) so that the USB hub performs the data transfer function.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (9)
1. A universal serial bus hub comprising
Upstream port, etc
A first downstream port comprising
A first data pin and a second data pin for transmitting data to or receiving data from the device when the first downstream port is occupied by the device, and
a voltage pin and a ground pin for transmitting power to the device when the first downstream port is occupied by the device, wherein the ground pin is floating, an
A control unit coupled to the ground pin of the upstream port and the first downstream port for determining whether the upstream port and the first downstream port are occupied, when the control unit determines that the upstream port is occupied but the first downstream port is not occupied, the control unit stops supplying power to the first downstream port to control the USB hub to operate in a first mode, and when the control unit determines that the upstream port and the first downstream port are both occupied, the control unit supplies power to the first downstream port to control the USB hub to operate in a second mode, wherein the power consumption of the USB hub in the first mode is lower than the power consumption of the USB hub in the second mode.
2. The universal serial bus hub of claim 1 wherein the control unit is further configured to maintain the bus at a ratio of: c
Monitoring whether the upstream port and the first downstream port are both occupied during the period of supplying power to the first downstream port, and
when at least one of the upstream port and the first downstream port is monitored to be unoccupied, the power supply to the first downstream port is stopped.
3. The universal serial bus hub of claim 1, further comprising one or more second downstream ports coupled to the control unit, wherein the control unit is further configured to be at a rate higher than the first rate
Determining whether the one or more second downstream ports are occupied, and
when the upstream port is occupied and the first downstream port and the one or more second downstream ports are not occupied, controlling the USB hub to operate in the first mode
When the upstream port is determined to be occupied and at least one of the one or more second downstream ports is determined to be occupied, controlling the USB hub to operate in the second mode.
4. The universal serial bus hub of claim 1, wherein the ground pin is coupled to a bias voltage through a resistor to form a floating circuit.
5. The universal serial bus hub of claim 4,
when the first downstream port is occupied, the ground pin has the first potential
When the first downstream port is not occupied, the ground pin has the second potential, and
the floating circuit determines whether the first downstream port is occupied according to the potential detected from the ground pin.
6. A method of operating a universal serial bus hub comprising an upstream port, a first downstream port, and a control unit, the method comprising
Setting the grounding pin of the first downstream port to float, so that the grounding pin has a first potential when the first downstream port is occupied, and has a second potential when the first downstream port is not occupied
The control unit determines whether the upstream port is occupied or not
The control unit determines whether the first downstream port is occupied according to the potential detected from the ground pin
When the upstream port is occupied but the first downstream port is not, the control unit stops supplying power to the first downstream port to control the USB hub to operate in the first mode
When the upstream port and the first downstream port are both occupied, the control unit supplies power to the first downstream port to control the universal serial bus hub to operate in a second mode, wherein the power consumption of the universal serial bus hub in the first mode is lower than that in the second mode.
7. The method of claim 6, further comprising
Monitoring whether the upstream port and the first downstream port are both occupied during the period that power is supplied to the first downstream port, and
when it is monitored that at least one of the upstream port and the first downstream port is unoccupied, the control unit stops the power from being supplied to the downstream port.
8. The method of claim 6, wherein the USB hub further comprises one or more second downstream ports, the one or more second downstream ports coupled to the control unit, the method further comprising:
determining whether the one or more second downstream ports are occupied
When the upstream port is occupied and the first downstream port and the one or more second downstream ports are not occupied, controlling the USB hub to operate in the first mode
When the upstream port is determined to be occupied and at least one of the one or more second downstream ports is determined to be occupied, controlling the USB hub to operate in the second mode.
9. A display comprises
Screen &
A universal serial bus hub as claimed in any one of claims 1 to 5.
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| CN201610079220.7A CN105760334B (en) | 2016-02-04 | 2016-02-04 | Universal serial bus hub, method for operating the same and display |
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| CN201610079220.7A CN105760334B (en) | 2016-02-04 | 2016-02-04 | Universal serial bus hub, method for operating the same and display |
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| CN105760334B true CN105760334B (en) | 2021-10-22 |
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| CN111290981B (en) * | 2018-12-10 | 2021-06-18 | 瑞昱半导体股份有限公司 | Universal serial bus control circuit |
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| CN201639115U (en) * | 2009-11-02 | 2010-11-17 | 郭中鼎 | USB concentrator |
| CN102567264A (en) * | 2010-12-07 | 2012-07-11 | 启碁科技股份有限公司 | Universal serial bus hub and power source management method thereof |
| US20130300214A1 (en) * | 2012-05-11 | 2013-11-14 | Lite-On Technology Corporation | Transmission cable, electronic device using the same, and method for switching operation mode of the electronic device |
| CN104657313A (en) * | 2013-11-21 | 2015-05-27 | 创惟科技股份有限公司 | Detecting system and method for universal serial bus device |
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2016
- 2016-02-04 CN CN201610079220.7A patent/CN105760334B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201639115U (en) * | 2009-11-02 | 2010-11-17 | 郭中鼎 | USB concentrator |
| CN102567264A (en) * | 2010-12-07 | 2012-07-11 | 启碁科技股份有限公司 | Universal serial bus hub and power source management method thereof |
| US20130300214A1 (en) * | 2012-05-11 | 2013-11-14 | Lite-On Technology Corporation | Transmission cable, electronic device using the same, and method for switching operation mode of the electronic device |
| CN104657313A (en) * | 2013-11-21 | 2015-05-27 | 创惟科技股份有限公司 | Detecting system and method for universal serial bus device |
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