CN212846747U - Multi-port expanded handwriting board - Google Patents

Abstract

A multi-port expanded handwriting board comprises a main port, at least one expansion port, an input panel, a conversion circuit and a detection circuit, wherein the main port is used for signal connection with user terminal equipment, the expansion port is used for expanding peripheral equipment connected with the user terminal equipment, the input panel is used for sensing external writing, the conversion circuit is used for converting the signal type adaptive to the main port into the signal type adaptive to the expansion port, and the detection circuit is used for detecting and forming detection data according to the writing sensed by the input panel and/or key operation and transmitting the detection data to the user terminal equipment through the main port. The technical scheme overcomes the defect of single function of the conventional handwriting board, adds the function of multi-port expansion for the handwriting board, can realize handwriting input, charging, video transmission and file transmission functions between the handwriting board and user terminal equipment only through one main port, and improves the use experience of a user.

Description

Multi-port expanded handwriting board

Technical Field

The invention relates to the technical field of handwriting boards, in particular to a multi-port expanded handwriting board.

Background

Due to special reasons such as epidemic situations, a plurality of people need to work, study or teach remotely through a network at home, and under the condition, the demands of two products in the market are greatly increased, namely a handwriting product and a screen projection product. The handwriting products can be used for drawing, making notes, making questions and the like, and the written contents are stored in real time in a digital paperless manner; the screen projection product can project contents such as a mobile phone, a tablet personal computer, a notebook computer, a U disk, a hard disk and the like onto a display or a television with a large screen, and the visual fatigue caused by too small screen of the mobile phone, the tablet personal computer and the like is avoided.

At present, no matter a handwriting product or a screen projection product, the two products are both individual, and a port of a user terminal device (such as a mobile phone, a tablet computer, and a notebook computer) needs to be accessed at the same time, which easily causes a dilemma that the port of the user terminal device is occupied too much or even no port is available. In addition, the functions of the handwriting products are too single, external equipment cannot be expanded, and user experience is reduced in practical application.

Disclosure of Invention

The invention mainly solves the technical problems that the existing handwriting products have single functions and cannot realize convenient application of port expansion and screen projection.

In order to solve the above technical problem, the present application provides a multi-port extended handwriting pad, which includes: the main port is used for signal connection with user terminal equipment; at least one expansion port, wherein the expansion port is used for expanding peripheral equipment connected with the user terminal equipment; the input panel is used for sensing external handwriting and/or key operation; the conversion circuit is in signal connection with the main port and the expansion port and is used for converting the signal type adapted by the main port into the signal type adapted by the expansion port; and the detection circuit is in signal connection with the input panel and the conversion circuit, is used for detecting and forming detection data according to the handwriting and/or key operation sensed by the input panel, and transmits the detection data to the user terminal equipment through the main port.

The type of the main port comprises an uplink USB-C interface, and the type of the expansion port comprises a USB-A interface and/or a USB-C interface; the conversion circuit comprises a HUB chip, and the HUB chip is connected to the uplink USB-C interface and connected to the USB-A interface and/or the USB-C interface; the HUB chip is used for converting signal types between the uplink USB-C interface and the USB-A interface and/or between the uplink USB-C interface and the USB-C interface.

The detection circuit comprises an input end, an output end and a signal detection chip, wherein the input end of the detection circuit is in signal connection with the input panel and inputs signals of handwriting and/or key operation, the signal detection chip is used for converting the signals of the handwriting and/or the key operation into detection data, and the output end of the detection circuit is connected with the HUB chip and outputs the detection data; the HUB chip establishes a signal path between the detection circuit and the uplink USB-C interface, so that detection data output by the detection circuit is transmitted to the outside through the uplink USB-C interface.

The type of the expansion port also comprises an HDMI interface and/or a VGA interface; the conversion circuit further comprises a video signal conversion chip, and the video signal conversion chip is connected to the uplink USB-C interface and is connected to an HDMI interface and/or a VGA interface; the video signal conversion chip is used for converting signal types between the uplink USB-C interface and the HDMI interface and/or between the uplink USB-C interface and the VGA interface.

The multi-port expanded handwriting board further comprises a power supply circuit, wherein the power supply circuit comprises one electric connection end of a power switch, a DC-DC chip and a PD chip; one electric connection end of the power switch is electrically connected with the uplink USB-C interface and obtains electric power, the other electric connection end of the power switch is connected with the input end of the DC-DC chip, and the output end of the DC-DC chip provides stable direct current for the PD chip, the HUB chip, the video signal conversion chip and the detection circuit; the PD chip comprises a plurality of control ends, and the plurality of control ends of the PD chip are respectively in signal connection with the HUB chip, the video signal conversion chip and the detection circuit; the PD chip is used for adjusting the working voltage and the working current of the HUB chip, the video signal conversion chip and the detection circuit according to a built-in PD protocol.

The multi-port expanded handwriting board further comprises a power supply port, and the power supply port is electrically connected with one electric connection end of the power switch and one control end of the PD chip; and the PD chip is also used for controlling the power supply port to supply power to the main port in a fast charging mode according to a PD protocol.

The type of the power supply port is a USB-C interface and can be in interface adaptation with an external charger.

For an expansion port with the type of a USB-A interface or a USB-C interface, peripheral equipment for connecting the expansion port comprises a U disk, a hard disk, a mouse, a keyboard, an optical drive, a sound box, a printer, an LED lamp, a network card and a camera; for an expansion port with the type of an HDMI interface or a VGA interface, peripheral devices for connecting the expansion port comprise a display, a projector and a television.

The main port adopts a male connector or female connector type interface, and the expansion port adopts a female connector type interface.

The beneficial effect of this application is:

the multi-port expanded handwriting board comprises a main port, at least one expansion port, an input panel, a conversion circuit and a detection circuit, wherein the main port is used for signal connection of user terminal equipment, the expansion port is used for expansion connection of peripheral equipment of the user terminal equipment, the input panel is used for sensing external handwriting and/or key operation, the conversion circuit is used for converting the signal type adaptive to the main port into the signal type adaptive to the expansion port, and the detection circuit is used for detecting and forming detection data according to the handwriting and/or the key operation sensed by the input panel and transmitting the detection data to the user terminal equipment through the main port. On the first hand, because the main port and the expansion port are configured for the handwriting board, the handwriting board can communicate with the user terminal equipment through the main port and can also communicate with the peripheral equipment through the expansion port, and the functions of the conventional handwriting board are enriched; in the second aspect, the conversion circuit can convert the signal type adapted to the main port into the signal type adapted to the expansion port, so that the conversion circuit and the expansion port can form a docking station for the main port, and a user can simultaneously charge, screen or connect an external storage device to the user terminal device when using the handwriting pad; in the third aspect, the technical scheme overcomes the defect of single function of the conventional handwriting board, adds a multi-port expansion function to the handwriting board, so that the handwriting board can realize handwriting input, charging, video transmission and file transmission functions with user terminal equipment only through one main port, and the use experience of a user is improved.

Drawings

FIG. 1 is a schematic diagram illustrating an overall structure of a tablet according to a first embodiment;

FIG. 2 is a schematic circuit diagram of a handwriting board according to a second embodiment;

fig. 3 is a schematic circuit structure diagram of a handwriting board according to a third embodiment.

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 features, operations, or characteristics described in the specification 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.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

The first embodiment,

Referring to fig. 1, the present application provides a multi-port extendedtablet 1, wherein the body of thetablet 1 includes amain port 11, at least oneextension port 12 and aninput panel 13.

Themain port 11 is used for signal connection of the user terminal device U1 and data communication with the user terminal device U1. Even themain port 11 is able to draw dc power from the user terminal device U1 to supply other functional units in thetablet 1.

In this embodiment, the user terminal device U1 may be some electronic device used with a tablet, such as a laptop, a desktop, a tablet, a smart phone, a workstation, and so on. The user terminal device U1 has a port matching with themain port 11, for example, if themain port 11 is a male interface of USB-C type, the user terminal device U1 should have a female interface of USB-C type, and the two interfaces are directly connected to communicate.

Theexpansion port 12 is used for expanding a peripheral device U2 connected to the user terminal device U1, where the peripheral device U2 is a tool for the user terminal device U1 to communicate with the outside, and may include input and output devices, an external memory, a signal converter, a peripheral processor, and the like, or may be a common computer peripheral expansion component such as a usb disk, a hard disk, a mouse, a keyboard, an optical drive, a sound, a printer, an LED lamp, a network card, a camera, and the like, or may be an office or home appliance such as a display, a projector, a television, and the like.

It should be noted that, in this embodiment, the number of theexpansion ports 12 is not limited, and based on the number of the peripheral devices that the user needs to adapt to, the same type ofexpansion port 12 may be set to adapt to one type of peripheral device, or multiple types ofexpansion ports 12 may be set to adapt to multiple types of peripheral devices. Specifically, theexpansion port 12 includes a USB-a interface and/or a USB-C interface so as to be adapted to electronic components such as a USB disk, a hard disk, a mouse, a keyboard, an optical drive, a sound, a printer, an LED lamp, a network card, a camera, and the like; theexpansion port 12 may also include an HDMI interface and/or a VGA interface to accommodate displays, projectors, televisions, and the like.

In this embodiment, themain port 11 and theexpansion port 12 may be fixedly disposed on the edge of the body of thetablet 1 or on the surface of the casing, and the distribution position and the number are not strictly limited, so as to facilitate the insertion and extraction of the connector.

Theinput panel 13 is provided on the upper surface of the body of thetablet 1, and has a sensing area for sensing external handwriting and/or key operation. Theinput panel 13 may be a finger touch panel, which changes the resistance or capacitance change at a certain point of the substrate by finger touch, and generates handwriting by sensing the position of a contact; theinput panel 13 may also be a touch panel of an electromagnetic induction pen, which emits electromagnetic waves, and the electromagnetic induction pen determines the position of a contact point after sensing the electromagnetic waves by the substrate and generates handwriting. Of course, some physical keys or virtual keys may be arranged on theinput panel 13, and the user may generate key operation by pressing the keys. It is to be understood that the input mode and the configuration of theinput panel 13 are not particularly limited herein.

It should be noted that thetablet 1 of the present application is an input device for the user terminal device U1, and has a function of inputting characters or drawing, and may also have some cursor movement control functions of a mouse.

In this embodiment, since themain port 11 and theexpansion port 12 are configured for thetablet 1, thetablet 1 can communicate with the user terminal device U1 through themain port 11, and can communicate with the peripheral device U2 through theexpansion port 12, thereby enriching the functions of the conventional tablet. For example, if themain port 11 of thetablet 1 is connected to a notebook computer and theexpansion port 12 is connected to a projector, thetablet 1 can not only transmit the sensed handwriting to the notebook computer, but also convert and transmit the content of the notebook computer to the projector, so that the written content can be projected without limitation, and the user can easily and freely select simple operation to achieve unexpected effects. The handwriting board with the multiple expansion ports can increase the usability of the handwriting board, enhance the equipment interaction performance of multimedia teaching, conference and video conference, overcome the inconvenience of limited user terminal equipment interfaces, and has strong practicability.

Example II,

Referring to fig. 2, the present embodiment discloses a multi-port extended handwriting board, which includes amain port 11, anextended port 12, aninput panel 13, aconversion circuit 14 and adetection circuit 15.

Themain port 11 is used for signal connection of the user terminal device U1 and data communication with the user terminal device U1.

Theexpansion port 12 is used for expanding peripheral devices connected to the user terminal device U1, where the peripheral device U2 is a tool for the user terminal device U1 to communicate with the outside, and may include input and output devices, an external memory, a signal converter, a peripheral processor, and the like, and may even be a common computer peripheral expansion component such as a usb disk, a hard disk, a mouse, a keyboard, an optical disc drive, a sound, a printer, an LED lamp, a network card, a camera, and the like, and may also be an office or home appliance such as a display, a projector, a television, and the like. Theexpansion port 12 may include a USB-a interface and/or a USB-C interface to accommodate electronic components such as a USB disk, a hard disk, a mouse, a keyboard, an optical drive, a sound, a printer, an LED lamp, a network card, a camera, etc.

Theconversion circuit 14 is in signal connection with themain port 11 and theexpansion port 12, and is used for converting the signal type adapted by themain port 11 into the signal type adapted by theexpansion port 12. In a specific embodiment, the type of themain port 11 includes an upstream USB-C interface, and the type of theexpansion port 12 includes a USB-a interface and/or a USB-C interface; then, theconversion circuit 14 includes a HUB chip, which is connected to the upstream USB-C interface, and connected to the USB-a interface and/or the USB-C interface; the HUB chip is used for converting signal types between the uplink USB-C interface and the USB-A interface and/or between the uplink USB-C interface and the USB-C interface. For example, the HUB chip may adopt a HUB master chip VL817 that is available on the market.

Thedetection circuit 15 is in signal connection with theinput panel 13 and theconversion circuit 14; thedetection circuit 15 is used for detecting and forming coordinate data according to the handwriting sensed by theinput panel 13, and transmitting the coordinate data to the user terminal device U1 through themain port 11; in addition, thedetection circuit 15 can also detect and form instruction data according to key operations sensed by theinput panel 13; the formed coordinate data and instruction data are collectively referred to as detection data in the present embodiment.

For example, theinput panel 13 is an electromagnetic pen touch panel, when the electromagnetic pen sends an electromagnetic signal with a specific frequency to the input panel, thedetection circuit 15 connected to theinput panel 13 is used as a microcontroller to sequentially scan the X-axis and the Y-axis of the input panel, then calculate the absolute coordinates of the pen according to the magnitude of the signal, and transmit about 100 to 200 sets of coordinate data per second to the user terminal device U1 through theconversion circuit 14 and themain port 11.

In one embodiment, thedetection circuit 15 includes an input terminal, an output terminal, and a signal detection chip, the input terminal of thedetection circuit 15 is in signal connection with theinput panel 13 and inputs the signal of the handwriting, the signal detection chip is used to convert the signal of the handwriting and/or the key operation into detection data, and the output terminal of thedetection circuit 15 is connected with the HUB chip (i.e., the conversion circuit 14) and outputs the detection data. It can be understood that the HUB chip establishes a signal path between thedetection circuit 15 and the USB-C interface (referred to herein as the main port 11), so that the coordinate data output by thedetection circuit 15 is transmitted to the outside through the USB-C interface. It is understood that the signal detection chip may be an internal microprocessor chip of a conventional writing pad, and thus, a detailed description thereof will not be provided herein.

Further, thewriting pad 1 further comprises apower circuit 16, and thepower circuit 16 comprises onepower connection terminal 161 of the power switch, a DC-DC chip 162 and aPD chip 163.

One electrical terminal of thepower switch 161 is electrically connected to the upstream USB-C interface (here, the main port 11) and obtains power, the other electrical terminal of thepower switch 161 is connected to the input terminal of the DC-DC chip 162, and the output terminal of the DC-DC chip 162 provides stable direct current for thePD chip 163, the HUB chip (such as the conversion circuit 14) and thedetection circuit 15. Thepower switch 161 may be a conventional electronic switch, such as a fet controllable switch element, which can perform the on/off function between the input terminal and the output terminal under the action of a control signal.

ThePD chip 163 includes a plurality of control terminals, and the plurality of control terminals of thePD chip 163 are respectively connected to the HUB chip and thedetection circuit 15 by signals. ThePD chip 163 is used to adjust the operating voltage and operating current of the HUB chip, detection circuit according to the built-in PD protocol. ThePD chip 163 may employ some conventional power management chips, such as the PD control chip VL 102. It should be noted that the PD protocol built in the PD chip refers to a USB-PD fast charging protocol, which is a fast charging specification established by a USB-IF organization and is one of the mainstream fast charging protocols at present; the USB-PD rapid charging protocol can increase the power transmission through a USB cable and a connector, and expand the power supply capacity of a cable bus in USB application, thereby achieving the purpose of improving charging voltage or current and freely changing the power transmission direction.

Further, thewriting pad 1 further includes a power supply port 17, and the power supply port 17 is electrically connected to another power connection terminal of thepower switch 161 and a control terminal of the PD chip. Then, in the case where the power supply port 17 is connected to a charger, thePD chip 163 is also configured to control the power supply port 17 to supply power to themain port 11 in a fast charging manner according to the PD protocol. When the power supply port 17 is connected to the charger, thePD chip 163 may control thepower switch 161 to conduct the power supply port 17 and themain port 11, so as to charge the user terminal device U1. For example, the USB-C interface (here, the power supply port 17) supports 15W (5V/3A) by default, but after the USB-PD protocol is implemented, the output power can be supported to 100W (20V/5A) at maximum.

It should be noted that the type of the power supply port 17 is a USB-C interface, and the power supply port 17 can interface with an external charger.

Example III,

Referring to fig. 3, the present embodiment discloses a multi-port extended handwriting board, which includes amain port 11, a plurality ofextension ports 12, aninput panel 13, aconversion circuit 14, and adetection circuit 15.

Themain port 11 is used for signal connection of the user terminal device U1 and data communication with the user terminal device U1. Eachexpansion port 12 is used for expanding and connecting peripheral devices of the user terminal device U1, where the peripheral device U2 is a tool for the user terminal device U1 to communicate with the outside, and may include common computer peripheral expansion components such as a usb disk, a hard disk, a mouse, a keyboard, an optical drive, a sound, a printer, an LED lamp, a network card, a camera, and may also include office or household appliances such as a display, a projector, and a television.

Theconversion circuit 14 includes aHUB chip 141, and theHUB chip 141 is in signal connection with themain port 11 and a part of theexpansion ports 12, and is configured to convert the signal type adapted to themain port 11 into the signal type adapted to the connectedexpansion ports 12. For example, the type of themain port 11 includes an uplink USB-C interface, the type of the expansion port b includes a USB-a interface, and the type of the expansion port C is a USB-C interface; theHUB chip 141 in theconversion circuit 14 is then used to convert the signal types between the upstream USB-C interface and the USB-a interface, and between the upstream USB-C interface and the USB-C interface.

It should be noted that themain port 11 has a function of data uplink transmission, so that the type of the main port can be an uplink USB-C interface; the expansion port has the function of data downlink transmission, so the self type can be a downlink USB-C interface. The uplink and the downlink only indicate relative transmission modes of data, and do not limit the structure and the function of the USB-C interface.

Wherein, thedetection circuit 15 is connected with theinput panel 13 and theconversion circuit 14 by signals; thedetection circuit 15 is used for detecting and forming detection data according to the handwriting and/or key operation sensed by theinput panel 13, and transmitting the detection data to the user terminal device U1 through themain port 11. Specifically, thedetection circuit 15 may include an input terminal, an output terminal, and a signal detection chip, the input terminal of thedetection circuit 15 is in signal connection with theinput panel 13 and inputs a signal of the handwriting, the signal detection chip is configured to convert the signal of the handwriting and/or the key operation into detection data (such as coordinate data and instruction data), and the output terminal of thedetection circuit 15 is connected with theHUB chip 141 and outputs the detection data.

Further, the type of theexpansion port 12 of thetablet 1 further includes an HDMI interface and/or a VGA interface, for example, the expansion port a adopts an HDMI interface. Then, theconversion circuit 14 further includes a video signal conversion chip 142, and the video signal conversion chip 142 is connected to the upstream USB-C interface (here, the main port 11) and is connected to the HDMI interface and/or the VGA interface; the video signal conversion chip 142 is used for converting signal types between the uplink USB-C interface and the HDMI interface, and/or between the uplink USB-C interface and the VGA interface. It should be noted that the video signal conversion chip 142 may be a conventional signal conversion chip PS 176.

In the present embodiment, thetablet 1 further includes apower circuit 16, and thepower circuit 16 includes onepower connection terminal 161 of a power switch, a DC-DC chip 162, and aPD chip 163. One electrical terminal of thepower switch 161 is electrically connected to the USB-C interface (here, the main port 11) and obtains power, the other electrical terminal of thepower switch 161 is connected to the input terminal of the DC-DC chip 162, and the output terminal of the DC-DC chip 162 provides stable direct current for thePD chip 163, theHUB chip 141, the video signal conversion chip 142, and thedetection circuit 15. ThePD chip 163 includes a plurality of control terminals, and the plurality of control terminals of thePD chip 163 are respectively in signal connection with theHUB chip 141, the video signal conversion chip 142, and thedetection circuit 15. ThePD chip 163 is used to adjust the operating voltage and operating current of theHUB chip 141, the video signal conversion chip 142, and thedetection circuit 15 according to the built-in PD protocol.

In this embodiment, thewriting pad 1 further includes a power supply port 17, and the power supply port 17 is electrically connected to the other power connection terminal of thepower switch 161 and a control terminal of the PD chip. Then, in the case where the power supply port 17 is connected to a charger, thePD chip 163 is also configured to control the power supply port 17 to supply power to themain port 11 in a fast charging manner according to the PD protocol. It should be noted that the type of the power supply port 17 is a USB a/B/C interface, and the power supply port 17 can be adapted to interface with an external charger.

In this embodiment, referring to fig. 3, for the expansion port 12 (such as expansion ports b and C) of the USB-a interface or the USB-C interface, the peripheral devices for connecting the expansion port include a USB disk, a hard disk, a mouse, a keyboard, an optical drive, a sound, a printer, an LED lamp, a network card, and a camera. For the expansion port 12 (such as the expansion port a) with the type of HDMI interface or VGA interface, the peripheral devices for connecting the expansion port include a display, a projector, and a television.

In a specific embodiment, themain port 11 of thetablet 1 may be a male or female type interface, and theexpansion port 12 may be a female type interface. This type of port arrangement facilitates access of thetablet 1 to conventional user terminal equipment and also conventional peripheral equipment to thetablet 1.

As will be understood by those skilled in the art, since the convertingcircuit 14 can convert the signal type adapted by themain port 11 into the signal type adapted by theexpansion port 12, the convertingcircuit 14 and theexpansion port 12 can form a Docking station (Docking station) for themain port 11, so that the user can simultaneously charge, screen or connect an external storage device to the user terminal device when using the tablet.

In addition, this application technical scheme has overcome the not enough of conventional handwriting pad function singleness, has added the function of multiport extension for the handwriting pad only can realize through a main port with user terminal equipment between handwriting input, charge, video transmission, file transmission function, promote user's use experience.

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. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.

Claims (9)

1. A multiport extended handwriting pad, comprising:

the main port is used for signal connection with user terminal equipment;

at least one expansion port, wherein the expansion port is used for expanding peripheral equipment connected with the user terminal equipment;

the input panel is used for sensing external handwriting and/or key operation;

the conversion circuit is in signal connection with the main port and the expansion port and is used for converting the signal type adapted by the main port into the signal type adapted by the expansion port;

and the detection circuit is in signal connection with the input panel and the conversion circuit, is used for detecting and forming detection data according to the handwriting and/or key operation sensed by the input panel, and transmits the detection data to the user terminal equipment through the main port.

2. The multi-port extended handwriting board of claim 1, wherein said type of primary port comprises an upstream USB-C interface, and said type of extension port comprises a USB-a interface and/or a USB-C interface;

the conversion circuit comprises a HUB chip, and the HUB chip is connected to the uplink USB-C interface and connected to the USB-A interface and/or the USB-C interface; the HUB chip is used for converting signal types between the uplink USB-C interface and the USB-A interface and/or between the uplink USB-C interface and the USB-C interface.

3. The multi-port extended handwriting pad according to claim 2, wherein the detection circuit comprises an input end, an output end and a signal detection chip, the input end of the detection circuit is in signal connection with the input panel and inputs signals of handwriting and/or key operation, the signal detection chip is used for converting the signals of handwriting and/or key operation into detection data, and the output end of the detection circuit is connected with the HUB chip and outputs the detection data;

the HUB chip establishes a signal path between the detection circuit and the uplink USB-C interface, so that detection data output by the detection circuit is transmitted to the outside through the uplink USB-C interface.

4. The multi-port extended handwriting pad of claim 3, wherein said type of extension port further comprises an HDMI interface and/or a VGA interface;

the conversion circuit further comprises a video signal conversion chip, and the video signal conversion chip is connected to the uplink USB-C interface and is connected to an HDMI interface and/or a VGA interface; the video signal conversion chip is used for converting signal types between the uplink USB-C interface and the HDMI interface and/or between the uplink USB-C interface and the VGA interface.

5. The multi-port extended handwriting pad of claim 4, further comprising a power circuit comprising a power switch, a DC-DC chip and a PD chip;

one electric connection end of the power switch is electrically connected with the uplink USB-C interface and obtains electric power, the other electric connection end of the power switch is connected with the input end of the DC-DC chip, and the output end of the DC-DC chip provides stable direct current for the PD chip, the HUB chip, the video signal conversion chip and the detection circuit;

the PD chip comprises a plurality of control ends, and the plurality of control ends of the PD chip are respectively in signal connection with the HUB chip, the video signal conversion chip and the detection circuit; the PD chip is used for adjusting the working voltage and the working current of the HUB chip, the video signal conversion chip and the detection circuit according to a built-in PD protocol.

6. The multi-port extended handwriting pad of claim 5, further comprising a power supply port, said power supply port being connected to a further electrical connection terminal of said power switch, a control terminal of said PD chip; and the PD chip is also used for controlling the power supply port to supply power to the main port in a fast charging mode according to a PD protocol.

7. The multi-port extended handwriting board of claim 6, wherein said power port is of the USB-C interface type and is capable of interfacing with an external charger.

8. The multi-port extended handwriting pad of any of claims 2-7,

for an expansion port with the type of a USB-A interface or a USB-C interface, peripheral equipment for connecting the expansion port comprises a U disk, a hard disk, a mouse, a keyboard, an optical drive, a sound box, a printer, an LED lamp, a network card and a camera;

for an expansion port with the type of an HDMI interface or a VGA interface, peripheral devices for connecting the expansion port comprise a display, a projector and a television.

9. The multi-port extended handwriting tablet according to any of claims 2-7, wherein said main port employs a male or female type interface and said extension port employs a female type interface.

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