CN216561771U - USB control circuit and electronic whiteboard - Google Patents
USB control circuit and electronic whiteboard Download PDFInfo
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- CN216561771U CN216561771U CN202220047268.0U CN202220047268U CN216561771U CN 216561771 U CN216561771 U CN 216561771U CN 202220047268 U CN202220047268 U CN 202220047268U CN 216561771 U CN216561771 U CN 216561771U
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Abstract
The utility model provides a USB control circuit and an electronic whiteboard, comprising a switch unit, a USB extension unit, an information source switching unit and a control unit; one end of the switch unit is connected with the control unit and the touch unit of the electronic whiteboard respectively, and the other end of the switch unit is connected with one end of the USB extension unit and can be switched on and off under the control of the control unit; the other end of the USB expansion unit is connected with the information source switching unit, and the USB expansion unit is also used for being connected with USB equipment; the information source switching unit is respectively connected with the control unit and an OPS module of the electronic whiteboard and is used for being communicated with the control unit or the OPS module under the information source control signal of the control unit. The utility model can be connected with more USB devices.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to a USB control circuit and an electronic whiteboard.
Background
In an interactive electronic whiteboard, as the demands of customers are more and more abundant, the types of USB devices to be supported are more and more, and in the existing main chip scheme, a USB PORT of the interactive electronic whiteboard is limited by the number of Endpoint nodes, and the number of Endpoint nodes determines the number of USB devices to be effectively connected.
SUMMERY OF THE UTILITY MODEL
The utility model provides a USB control circuit which can improve the brightness of USB equipment which can be connected simultaneously.
In a first aspect, the present invention provides a USB control circuit, which includes a switching unit, a USB expansion unit, a source switching unit, and a control unit; one end of the switch unit is respectively connected with the control unit and the touch unit of the electronic whiteboard, and the other end of the switch unit is connected with one end of the USB extension unit and can be switched on and off under the control of the control unit; the other end of the USB extension unit is connected with the information source switching unit, and the USB extension unit is also used for being connected with USB equipment; the information source switching unit is respectively connected with the control unit and an OPS module of the electronic whiteboard and is used for being communicated with the control unit or the OPS module under an information source control signal of the control unit.
Further, the USB expansion unit includes at least one USB hub, and the USB hubs are connected to the switching unit and the source switching unit, respectively.
Further, the USB expansion unit includes two USB hubs, one of the USB hubs is used to connect the source switching unit and the control unit, and the other USB hub is used to connect the switch unit and the source switching unit.
Further, the USB expansion unit includes four USB hubs, one USB hub is used to connect the source switching unit and the control unit, and one USB hub is used to connect the switch unit and the remaining two USB hubs, and each USB hub is connectable to the USB device.
Further, the switch unit is a switching chip, the switching chip can be switched on and off under the control of the control unit, when the switching chip is switched on, the touch unit is communicated with the USB extension unit through the switching chip, and when the switching chip is switched off, the touch unit is disconnected from the USB extension unit.
Further, the model of the switching chip is SGM 7227.
Further, the control unit is an SOC chip.
Further, the OE pin of the switching chip is connected with the control unit.
Further, the source switching unit is a source switching chip.
In a second aspect, the present invention further provides an electronic whiteboard, including a touch unit, an OPS module, and the USB control circuit in any one of the above embodiments.
The USB control circuit and the electronic whiteboard disclosed by the utility model are provided with a switch unit between a touch unit and an extension unit, the switch unit is controlled to be switched on and off by a control unit, so as to control the connection and the disconnection of the touch unit and the extension unit, when the control unit controls an information source switching unit to connect an information source and the control unit, the control unit simultaneously controls the switch unit to be switched off, further the connection of the touch unit and the extension unit is interrupted, so that the control unit can be connected with and control more USB equipment, when the control unit controls the information source switching unit to connect the information source and an OPS module, the control unit synchronously controls the switch unit to be switched on, so that the touch unit is connected with the extension unit, further the information source switching unit is connected with the OPS module, whether the connection of the touch unit needs to be interrupted or not can be judged by a circuit according to different information source signals, so that the control unit can control more USB equipment, the convenience is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a block diagram of a USB control circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of a USB control circuit according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
In addition, directional terms used in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", and the like, refer to the attached drawings and the directions of usage of the product. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. Further, in the drawings, structures that are similar or identical are denoted by the same reference numerals.
Referring to fig. 1, fig. 1 is a block diagram of a USB control circuit 10 provided in the present invention, and fig. 2 is a block diagram of a USB control circuit 10 provided in another embodiment of the present invention. As shown in the figure, the USB control circuit 10 includes a switching unit 12, a USB expansion unit 13, a source switching unit 14, and a control unit 15; one end of the switch unit 12 is connected to the control unit 15 and the touch unit 11 of the electronic whiteboard, respectively, and the other end thereof is connected to one end of the USB expansion unit 13, and can be turned on and off under the control of the control unit 15; the other end of the USB expansion unit 13 is connected to the source switching unit 14, and the USB expansion unit 13 is further configured to connect to a USB device 30; the source switching unit 14 is respectively connected to the control unit 15 and the OPS module 20 of the electronic whiteboard, and is configured to communicate with the control unit 15 or communicate with the OPS module 20 under a source control signal of the control unit 15.
The control unit 15 may be an SOC chip, the number of USB Endpoint nodes of different SOC chips is different, and an example in which one SOC chip can be connected with 32 USB Endpoint nodes is described. Generally, one USB device 30 needs to occupy 3 USB Endpoint nodes, the touch unit 11 needs to occupy 7 USB Endpoint nodes, the electronic whiteboard is generally equipped with a camera and a microphone device, and the camera and the microphone device respectively occupy 3 USB Endpoint nodes, so that when the electronic whiteboard is not connected to other USB devices 30, a total of 7+3+ 13 USB Endpoint nodes are occupied, and meanwhile, the USB expansion unit 13 also needs to occupy USB Endpoint nodes, the specific occupied number is determined by the number of USB hubs 131 included in the USB expansion unit 13, and one USB hub 131 occupies 4 USB Endpoint nodes. Taking a USB hub 131 as an example, a total of 17 USB Endpoint nodes are occupied, that is, at most 4 USB devices 30 can be connected. The touch unit 11 may be a touch frame of an electronic whiteboard, which generally transmits touch data by using UART + USB signals, where the UART fixedly transmits data to an Android system, when an information source of the electronic whiteboard is an Android information source, that is, when touch by the touch unit 11 is not needed, the control unit 15 controls the switch unit 12 to turn off, and interrupts USB connection between the touch unit 11 and the USB extension unit 13, so that the control unit 15 releases 7 USB Endpoint nodes, the control unit 15 has 7 more USB Endpoint nodes that can be used for connecting to the USB device 30, and a user can connect two more USB devices 30 without replacing an SOC chip. When the signal source of the electronic whiteboard is the OPS signal source, if touch control needs to be performed through the touch control unit 11, the control unit 15 controls the switch unit 12 to be turned on, the touch control unit 11 is communicated with the USB extension unit 13 again, and 7 USB Endpoint nodes are occupied again.
In one embodiment, the USB expansion unit 13 includes at least one USB hub 131, and the USB hub 131 is connected to the switching unit 12 and the source switching unit 14 respectively.
In a further embodiment, the USB expansion unit 13 comprises two USB hubs 131, one of the USB hubs 131 is used to connect the source switching unit 14 and the control unit 15, and the other USB hub 131 is used to connect the switching unit 12 and the source switching unit 14.
In a further embodiment, the USB expansion unit 13 includes four USB hubs 131, one USB hub 131 is used to connect the source switching unit 14 and the control unit 15, one USB hub 131 is used to connect the switch unit 12 and the remaining two USB hubs 131, and each USB hub 131 can be connected to the USB device 30.
The USB hubs 131 are used to expand the number of connectable USB devices 30, and may be set according to the number of USB Endpoint nodes of the SOC chip, for example, for an SOC chip including 32 USB Endpoint nodes, four USB hubs 131 may be provided, as shown in fig. 2, a USB hub 131 is connected to the source switching unit 14 and the control unit 15, a USB hub 131 is connected between the switch unit 12 and the source switching unit 14, and the remaining two USB hubs 131 are connected to the USB hubs 131, and each USB hub 131 may be connected to a USB device 30. Under the condition that four USB hubs 131 are provided, the four USB hubs 131 occupy 16 USB Endpoint nodes altogether, and the USB device 30 commonly used for the electronic whiteboard occupies 13 USB Endpoint nodes, so that only 3 USB Endpoint nodes are left, and one USB device 30 can be connected, and when the control unit 15 controls the switch unit 12 to be turned off, the control unit 15 further has 10 USB Endpoint nodes, and can be connected to at most 3 USB devices 30. In addition, when the number of USB Endpoint nodes of the control unit 15 decreases, the number of corresponding USB hubs 131 also decreases.
The utility model further provides an electronic whiteboard, which includes a touch unit 11, an OPS module 20 and the USB control circuit 10 according to any of the above embodiments.
The USB control circuit and the electronic whiteboard disclosed by the utility model can control the on and off of the switch unit according to the information source of the electronic whiteboard, and further control the connection and disconnection of the touch unit and the USB extension unit, so as to adjust the number of USB devices which can be simultaneously connected by the control unit, and improve the convenience.
While the utility model has been described with reference to specific embodiments, the utility model is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the utility model. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A USB control circuit is characterized by being applied to an electronic whiteboard and comprising a switch unit, a USB extension unit, an information source switching unit and a control unit;
one end of the switch unit is respectively connected with the control unit and the touch unit of the electronic whiteboard, and the other end of the switch unit is connected with one end of the USB extension unit and can be switched on and off under the control of the control unit;
the other end of the USB extension unit is connected with the information source switching unit, and the USB extension unit is also used for being connected with USB equipment;
the information source switching unit is respectively connected with the control unit and an OPS module of the electronic whiteboard and is used for being communicated with the control unit or the OPS module under an information source control signal of the control unit.
2. The USB control circuit according to claim 1, wherein the USB expansion unit includes at least one USB hub, and the USB hubs are connected to the switching unit and the source switching unit, respectively.
3. The USB control circuit according to claim 2, wherein the USB expansion unit includes two USB hubs, one of the USB hubs is used to connect the source switching unit and the control unit, and the other of the USB hubs is used to connect the switching unit and the source switching unit.
4. The USB control circuit according to claim 2, wherein the USB expansion unit includes four USB hubs, one USB hub is used to connect the source switching unit and the control unit, one USB hub is used to connect the switching unit and the remaining two USB hubs, and each USB hub is connectable to the USB device.
5. The USB control circuit of claim 1, wherein the switch unit is a switch chip, the switch chip is turned on and off under the control of the control unit, when the switch chip is turned on, the touch unit is connected to the USB expansion unit through the switch chip, and when the switch chip is turned off, the touch unit is disconnected from the USB expansion unit.
6. The USB control circuit of claim 5, wherein the switching chip is of a model SGM 7227.
7. The USB control circuit according to claim 6, wherein the control unit is an SOC chip.
8. The USB control circuit of claim 7, wherein an OE pin of the switch chip is connected to the control unit.
9. The USB control circuit of claim 1 wherein the source switching unit is a source switching chip.
10. An electronic whiteboard comprising a touch unit, an OPS module and the USB control circuit of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220047268.0U CN216561771U (en) | 2022-01-10 | 2022-01-10 | USB control circuit and electronic whiteboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220047268.0U CN216561771U (en) | 2022-01-10 | 2022-01-10 | USB control circuit and electronic whiteboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216561771U true CN216561771U (en) | 2022-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220047268.0U Active CN216561771U (en) | 2022-01-10 | 2022-01-10 | USB control circuit and electronic whiteboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216561771U (en) |
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2022
- 2022-01-10 CN CN202220047268.0U patent/CN216561771U/en active Active
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