TWM614161U - Multifunctional adapter device - Google Patents

Abstract

The model relates to a multifunctional adapter device, which has a first interface, a second interface and a third interface. The multifunctional adapter device includes: a switch unit electrically connected to the first interface and the second interface; The switching unit is electrically connected to the first interface, the second interface and the protocol control unit; a digital analog conversion unit is electrically connected to the switching unit and the third interface, and the digital analog conversion unit is used between the switching unit and the third interface Signal conversion; a protocol control unit, electrically connected to the first interface, the second interface, the third interface, the switch unit, the switching unit, the protocol control unit is used to detect the access of the first interface, the second interface and the third interface The device controls the disconnection/conduction state of the switch unit and the switch unit according to the handshaking protocol established by the access device, so as to realize the signal connection between the first interface and the second interface and/or the third interface.

Description

Multifunctional adapter

The new model relates to an input and output multifunctional switching device.

In recent years, with the popularization and development of audio-visual functions of electronic devices such as mobile phones and tablet computers, the headset peripherals and charging peripherals that are matched with them have also received increasing attention from users. For general portable electronic devices, USB devices are usually used to realize the function of charging or connecting earphones. The ordinary USB Type A to USB Type C charging cables are only used for charging mobile terminal devices such as mobile phones and tablets and USB data transmission. Ordinary earphones are Use 3.5mm audio interface.

However, the audio interface of the increasingly updated smart phone will move towards a full USB Type C interface, replacing the traditional 3.5mm audio interface. Then, when the user uses a mobile phone without a 3.5mm audio interface, he needs to use a Type C to Audio adapter cable to connect to the headset, so that the Type C interface is occupied. When the phone is out of power, the Type C to Audio adapter must be unplugged. Connect the cable and earphones, plug in the Type C charging cable and plug it into the charger or mobile power supply for charging, so that the audio will be switched to the external mode of the mobile phone, which greatly reduces the experience effect of users (especially music lovers and gamers) .

In order to solve the above technical problems, the purpose of the present invention is to provide a multifunctional adapter device with a first interface, a second interface and a third interface, through which the multifunctional adapter device can be charged on mobile electronic equipment. , Data transmission and audio external playback and other functions at the same time and free switching.

Specifically, the present model discloses a multifunctional adapter device, which has a first interface, a second interface, and a third interface. The adapter device includes: a switch unit electrically connected to the first interface , The second interface; a switching unit, including a first switching unit and a second switching unit, the first switching unit is electrically connected to the first interface, the second interface and the second switching Unit, the second switching unit is electrically connected to the first interface and the first switching unit; a digital-to-analog conversion unit is electrically connected to the second switching unit and the third interface, the digital-to-analog conversion unit Used for signal conversion between the second switching unit and the third interface; a protocol control unit, electrically connected to the first interface, the second interface, the third interface, and the switch unit , The first switching unit and the second switching unit, the protocol control unit is used to detect the access devices of the first interface, the second interface, and the third interface, and according to the connection The access device establishes a handshake protocol; wherein, the protocol control unit also controls the disconnection/conduction state of the switching unit, the first switching unit, and the second switching unit according to the handshaking protocol, thereby Realize signal communication between the first interface and the second interface and/or the third interface.

In the above multifunctional switching device, the protocol control unit includes a device access detection subunit and an on/off control subunit.

In the above multifunctional switching device, the signal includes a power signal and a data signal.

In the above multifunctional switching device, the handshaking protocol includes a charging handshaking protocol and a data handshaking protocol; wherein, the data handshaking protocol includes a first data handshaking protocol and a second data handshaking protocol protocol.

The above-mentioned multifunctional switching device, wherein the switch unit is used to implement the first interface and/or the second interface to send a level signal to the protocol control unit, and the first interface and the second interface The connection of the power signal between the two interfaces.

In the above multifunctional switching device, the first switching unit includes a first channel and a second channel, the second switching unit includes a third channel and a fourth channel, and the first channel is used for The data signal communication between the first interface and the second interface, and the third channel is used for the data signal communication between the second interface and the third interface; Four channels are used for the data signal communication between the first interface and the third interface; wherein, the on-off control sub-unit is used to control the first channel or the second channel and/or the The on/off state of the third channel or the fourth channel.

The switch unit includes a fifth channel, a sixth channel, and a seventh channel, wherein the fifth channel is used for the first interface to send a level signal to the protocol control unit; the sixth channel The second interface is used to send a level signal to the protocol control unit; the seventh channel is used to connect the power signal between the first interface and the second interface.

The above-mentioned multifunctional adapter device, wherein the first interface is used to plug in a charging device or a USB host, the second interface is used to plug in the external device, and the third interface is used to plug in a Earphone, the fifth channel and the sixth channel are in the on state; the device access detection subunit is used to detect the device access status of the first interface, the second interface, and the third interface , And establish the charging handshaking protocol and the first data handshaking protocol with the external device of the second interface; the on-off control sub-unit is used for according to the charging handshaking protocol and the first data handshaking protocol A data handshaking protocol controls the third channel and the seventh channel to be in the on state, and controls the fourth channel and the first switching unit to be in the off state.

The above-mentioned multifunctional adapter device, wherein the first interface is used to plug in a charging device, the second interface is used to plug in the external device, and the fifth channel and the sixth channel are in a conductive state The device access detection subunit is used to detect the device access conditions of the first interface, the second interface, and the third interface, and establish the external device with the second interface Charging handshake protocol; the on-off control sub-unit is used to control the seventh channel to be in the on state according to the charging handshaking protocol, and the first switching unit and the second switching unit are in the off state.

The above-mentioned multifunctional adapter device, wherein the first interface is used to plug in a USB host, the second interface is used to plug in the external device, and the fifth channel and the sixth channel are in a conductive state The device access detection subunit is used to detect the device access conditions of the first interface, the second interface, and the third interface, and establish the external device with the second interface The second data handshaking protocol; the on-off control subunit is used to control the first channel to be in the on state according to the second data handshaking protocol, and the second channel and the second switching unit are disconnected status.

The above-mentioned multifunctional adapter device, wherein the first interface is used to plug in a USB host, the third interface is used to plug in a headset, and the fifth channel is in a conducting state; the device access detection subunit Used to detect the device access status of the first interface, the second interface, and the third interface; the on-off control sub-unit is used to control the fourth channel to be on according to the device access status State, the third channel and the first switching unit are in a disconnected state.

The above-mentioned multifunctional adapter device, wherein the second interface is used for plugging in the external device, the third interface is used for plugging in a headset, and the sixth channel is in a conducting state; The device access detection subunit is used to detect device access conditions of the first interface, the second interface, and the third interface, and establish the first interface with the external device of the second interface. A data handshaking protocol; the on-off control subunit is used to control the third channel to be in the on state according to the first data handshaking protocol, and the fourth channel and the first switching unit to be in the off state .

In the above-mentioned multifunctional adapter device, the first interface is a USB Type A interface.

In the above multifunctional adapter device, the first interface is a USB Type C interface.

In the above-mentioned multifunctional adapter device, the second interface is a USB Type C interface.

In the above multifunctional switching device, the third interface is an audio interface.

In the above multifunctional switching device, the external device includes mobile terminal equipment such as a mobile phone, a tablet computer, and a notebook computer.

The beneficial effects of the new model: the switch device of the new model can realize multiple functions such as data transmission and audio playback while charging mobile electronic equipment, and can realize free switching between these functions, which greatly improves users (Especially music lovers and game players) experience effects used.

In order to make the above-mentioned features and effects of the present invention more clear and understandable, the following specific examples are given in conjunction with the accompanying drawings of the specification for detailed descriptions as follows.

11: The first interface

12: second interface

13: third interface

21: Protocol control unit

22: switch unit

23: switching unit

231: first switching unit

232: second switching unit

24: Digital analog conversion unit

FIG. 1 is a block diagram of the structure of a multifunctional adapter device according to an embodiment of the new type.

2A to 2C are schematic diagrams of the structure of the multifunctional adapter device according to an embodiment of the new type.

The embodiments of this specification provide a multifunctional adapter device to realize simultaneous charging, data transmission and/or use of earphones in one Type C or Type A electronic device, thereby increasing the convenience of using the electronic device. In order to make the technical content of the present invention and its purpose, features and advantages more obvious and understandable, a few specific embodiments are listed below in conjunction with the drawings, which are described in detail as follows.

However, it must be noted that these specific specific implementation cases are not used to limit the present model. The present invention can still be implemented with other features, components, methods and parameters. The specific embodiments are only used to illustrate the technical features of the present model, and not to limit the scope of the patent application of the present model. Those skilled in the art will be able to make equal modifications and changes based on the description in the following specification without departing from the spirit of the present invention. In different embodiments and drawings, the same elements will be represented by the same element symbols. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or Intermediate elements can also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements. As used herein, "connected" may refer to physical and/or electrical connection. Furthermore, "electrically connected" or "coupled" may mean that there are other elements between two elements.

Please refer to FIG. 1, which is a block diagram of the structure of a multifunctional adapter device according to an embodiment of the new type. The multifunctional switching device has a first interface 11, a second interface 12, and a third interface 13, and also includes a protocol control unit 21, a switch unit 22, a switch unit 23, and a digital-to-analog conversion unit 24. Wherein, as shown in FIGS. 2A to 2C, the first interface 11 can be a USB Type A slot or a Type C slot, and the first interface 11 is used to plug in a charging adapter device or a USB host (such as a computer, etc.). ) Or a mobile power supply; the second interface 12 may be a USB Type C slot, and the second interface 12 is used to plug an external device (such as a mobile terminal device such as a mobile phone, a tablet computer, etc.) for charging or data transmission for the terminal device. The third interface 13 may be an audio interface, and the third interface 13 is used to plug in a headset that supports CTIA and/or OMTP standards.

Please continue to refer to FIG. 1. As shown in FIG. 1, the protocol control unit 21 is electrically connected to the first interface 11, the second interface 12, and the third interface 13, and the switch unit 22 is electrically connected to the first interface 11, the second interface 12, and The protocol control unit 21; the switching unit 23 is electrically connected to the first interface 11 and the protocol control unit 21; the digital-to-analog conversion unit 24 is electrically connected to the switching unit 23 and the third interface 13. Wherein, the protocol control unit 21 detects the connected devices of the first interface 11, the second interface 12, and the third interface 13, and establishes a corresponding handshaking protocol according to the conditions of the connected devices. In this embodiment, the handshaking protocol includes a charging handshaking protocol and a data handshaking protocol. The establishment of the charging handshaking protocol is used for the first interface 11 to provide power to the second interface 12 to realize the connection to the second interface 12. The charging function of the external device. Specifically, in this embodiment, the data handshaking protocol further includes a first data handshaking protocol and a second data handshaking protocol. When the protocol control unit 21 detects that the second interface 12 is connected to mobile terminal devices such as mobile phones and tablets, and detects that the third interface 13 is plugged into a headset, the first data handshaking protocol is established to implement the second interface 12. Transmit audio data to the third interface 13 to realize the function of the mobile phone headset; when the protocol control unit 21 detects that the first interface 11 is connected to a USB host device (such as the USB port of a computer PC, etc.), and detects that the second interface 12 is connected When entering a mobile terminal device such as a mobile phone or a tablet computer, a second data handshaking protocol is established to realize the data transmission function between the first interface 11 and the second interface 12. When the protocol control unit 21 detects that the first port 11 is connected to a charging device such as a mobile power supply or a charging adapter, and detects that the second port 12 is connected to a mobile terminal device such as a mobile phone or a tablet computer, it establishes a charging handshake protocol to realize the first The power transmission between the interface 11 and the second interface 12 charges the mobile terminal device connected to the second interface 12.

In an embodiment of the present invention, the switch unit 22 is a three-way switch, which is used to implement the first interface 11 to send a level to the protocol control unit 21 and the second interface 12 to the protocol control unit 21. Signal to establish the connection between the first interface 11 and the protocol control unit 21 and the second interface 12 and the protocol control unit 21. At the same time, the switch unit 22 is also used to realize the connection between the first interface 11 and the second interface 12 The power signal is connected to charge the device plugged into the second interface 12 end.

Specifically, the switch unit 22 includes at least three signal transmission channels, namely a fifth channel, a sixth channel, and a seventh channel (not shown in the figure). When the first interface 11 is plugged into a charging device or a USB host device, the fifth channel is turned on, and the plugged charging device or USB host device sends a level signal to the protocol control unit 21 through the fifth channel to establish the charging The connection relationship between the device or USB host device and the protocol control unit 21; similarly, when the external device is plugged into the second interface 12, the sixth channel is turned on, and the sixth channel of the external device channel sends to the protocol control unit 21 A level signal is used to establish the connection relationship between the external device and the protocol control unit, so that the protocol control unit 21 can recognize the external device, and then establish a corresponding handshake protocol with the external device.

When the protocol control unit 21 establishes a charging handshake protocol with the external device of the second interface 12, the protocol control unit 21 further controls the seventh channel to be turned on, and the first interface 11 transmits the power signal to the second interface 12 to realize the Charging of external devices plugged into interface 12.

In addition, in another embodiment of the present invention, the protocol control unit 21 also controls the disconnection/conduction state of the switching unit 23 according to the established handshake protocol, so as to realize the first interface 11 and the second interface The signal connection between 12 and/or the third interface 13, according to the established handshaking protocol and the realized function, the signal includes a power signal and a data signal, that is, a data signal and/or power supply is performed between different interfaces Signal connection.

Further, in another embodiment of the present invention, the protocol control unit 21 further includes a device access detection subunit (not shown in the figure) and an on-off control subunit (not shown in the figure). Specifically, the device access detection subunit is mainly used to detect the access devices of the first interface 11, the second interface 12, and the third interface 13, and establish a corresponding handshaking protocol according to the access device; the on-off control subunit It is mainly used to control the disconnection/conduction state of the switch unit 22 and the switch unit 23 according to the established handshaking protocol, from The signal communication between the first interface 11 and the second interface 12 and/or the third interface 13 is realized.

Furthermore, the switching unit 23 further includes a first switching unit 231 and a second switching unit 232, wherein the first switching unit 231 is electrically connected to the first interface 11, the second interface 12, and the protocol control unit 21, respectively; the second switching unit 232 They are electrically connected to the first switching unit 231 and the protocol control unit 21 respectively. Wherein, the first switching unit 231 further includes a first channel and a second channel, and the second switching unit 232 further includes a third channel and a fourth channel (these channels are not shown in the figure), and the first channel is used for the first channel. The data signal connection between the interface 11 and the second interface 12, the third channel is used for the data signal connection between the second interface 12 and the third interface 13; the fourth channel is used for the first interface 11 and the third interface 13 data signal connection; wherein, the on-off control sub-unit realizes the on/off state of the first channel or the second channel and/or the third channel or the fourth channel respectively by controlling the on/off state of the first channel or the second channel and/or the third channel or the fourth channel. The on/off states of a switching unit 231 and a second switching unit 232 are controlled, so as to realize signal communication between the first interface 11 and the second interface 12 and/or the third interface 13.

In many embodiments of the present invention, the switching device of the present invention controls the on/off states of the respective channels of the first switching unit 231 and the second switching unit 232 in the switching unit 23 through the protocol control unit 21 described above, thereby controlling The signal communication between the first interface 11 and the second interface 12 and/or the third interface 13 is realized.

In an embodiment of the present invention, when the first interface 11 is connected to a charging device such as a charging adapter or a mobile power supply, and the second interface 12 is connected to an external device (such as a mobile terminal device such as a mobile phone, a tablet computer, etc.), the first interface of the switch unit 22 The fifth channel and the sixth channel are respectively turned on, the charging device and the external device respectively establish a connection relationship with the protocol control unit 21, and then the device access detection subunit of the protocol control unit 21 detects the devices of the first interface 11 and the second interface 12 According to the access situation, a charging handshaking protocol is established with the external device through the configuration channel pin (CC pin) of the external device according to the access situation. The on-off control sub-unit controls the seventh channel of the switch unit 22 to be on according to the charging handshaking protocol The first switching unit 231 and the second switching unit 232 are in a disconnected state. The seventh channel of the switch unit 22 realizes the connection of the power signal between the first interface 11 and the second interface 12; the disconnected state of the first switch unit 231 and the second switch unit 232 is achieved by closing the first channel and the second channel. , The third channel and the fourth channel are realized, that is, the first channel, the second channel, the third channel and the fourth channel are closed at this time. In this way, the charging adapter or mobile power supply can charge external devices (such as mobile phones, tablet computers, and other electronic devices) of the second interface 12 through the first interface 11. It should be pointed out that the closed state of this embodiment is a high-impedance state, which blocks the transmission of signals in the channel and plays a role of disconnecting the channel.

In an embodiment of the present invention, when the first interface 11 is connected to a USB host (such as a USB port of a computer PC, etc.), and the second interface 12 is connected to an external device (such as a mobile phone, a tablet computer, etc.), the second interface of the switch unit 22 The fifth channel and the sixth channel are respectively turned on, the USB host and the external device respectively establish a connection relationship with the protocol control unit 21, and then the device access detection subunit of the protocol control unit 21 detects the device connection of the first interface 11 and the second interface 12 According to the access situation, a second data handshaking protocol is established with the external device through the configuration channel pin (CC pin) of the external device. The on-off control sub-unit controls the first channel to be in the on state according to the second data handshaking protocol, the seventh channel of the switch unit 22 is in the off state, and the second channel, the third channel and the fourth channel (that is, the entire second switch The unit 232) is in the closed state, and the closed state in this embodiment is a high-impedance state, which blocks the transmission of signals in the channel and plays a role of disconnecting the channel. Specifically, the first channel is turned on, a data signal connection is established between the first interface 11 and the second interface 12, and the USB host (such as a computer, etc.) is connected to the second interface 12 through the first channel of the first switching unit 231, Realize the data connection between a USB host (such as a computer, etc.) and a mobile phone (or a tablet type terminal device), and the USB host (such as a computer, etc.) can read the memory data of the mobile phone (or a tablet type terminal device).

In addition, it should be pointed out that in another embodiment of the present invention, the device access detection subunit detects that the first interface 11 is connected to a USB host (such as a USB port of a computer PC), and the second interface Port 12 is connected to an external device (such as a mobile phone, a tablet computer, etc.). At this time, the device access detection sub-unit establishes a charging handshaking protocol and a second data handshaking with the external device through the configuration channel pin (CC pin) of the external device. protocol. The on-off control sub-units respectively control the seventh channel of the switch unit 22 to be turned on according to the charging handshaking protocol, and control the first channel to be in the on state according to the second data handshaking protocol, and the second channel, the third channel and the fourth channel (ie The entire second switching unit 232) is in a closed state, and the closed state in this embodiment is a high-impedance state, which blocks the transmission of signals in the channel and plays a role of disconnecting the channel. Specifically, the first channel is turned on, a data signal connection is established between the first interface 11 and the second interface 12, and the USB host (such as a computer, etc.) is connected to the second interface 12 through the first channel of the first switching unit 231, Realize the data connection between a USB host (such as a computer, etc.) and a mobile phone (or a tablet type terminal device), and the USB host (such as a computer, etc.) can read the memory data of the mobile phone (or a tablet type terminal device). At the same time, due to the conduction of the seventh channel of the switch unit 22, a power signal connection is established between the first interface 11 and the second interface 12 at the same time, so that the USB host (such as a computer, etc.) can be connected to a mobile phone (or tablet terminal device). ) To charge.

In an embodiment of the present invention, when the first interface 11 is connected to a USB host (such as a computer, etc.) and the third interface 13 is connected to a headphone device (the second interface 12 is in an empty state), the fifth channel of the switch unit 22 Is connected, the USB host establishes a connection relationship with the protocol control unit 21, the device access detection subunit of the protocol control unit 21 detects the device access of the first interface 11 and the third interface 13, and the on/off control subunit is based on the device connection The fourth channel is in the on state, the sixth channel and the seventh channel of the switch unit 22 are in the off state, and the first channel and the second channel (that is, the entire first switching unit 231) are in the off state. The closed state is a high-impedance state, which blocks the transmission of signals in the channel and plays a role in disconnecting the channel. Specifically, the fourth channel is turned on, a data signal connection is established between the first interface 11 and the third interface 13, and the USB host (such as a computer, etc.) is connected to the third interface 13 through the fourth channel of the second switching unit 232, Realize the data connection between a USB host (such as a computer, etc.) and a headset (or a tablet type terminal device). At this time, the USB data on the USB host (such as a computer, etc.) is connected to the digital-to-analog conversion unit 24 through the fourth channel of the second switching unit 232 , The digital-to-analog conversion unit 24 will The USB data is converted into an analog audio signal, which is connected to the left and right channels of the earphone and the microphone to realize the conversion connection between the audio digital signal of the USB host (such as a computer, etc.) and the analog earphone.

In an embodiment of the present invention, when the second interface 12 is connected to an external device (such as a mobile phone, a tablet computer, etc.), and the third interface 13 is connected to an earphone device (the first interface is in an empty state), the first interface of the switch unit 22 The six channels are turned on, the external device establishes a connection relationship with the protocol control unit 21, and the device access detection subunit of the protocol control unit 21 detects the device access status of the second interface 12 and the third interface 13, and based on the access status Establish a first data handshaking protocol with the external device through the configuration channel pin (CC pin) of the external device. The on-off control sub-unit controls the third channel to be in the on state according to the first data handshaking protocol, the seventh channel of the switch unit 22 to be in the off state, the fourth channel and the first switching unit to be in the off state, the closed state of this embodiment It is a high-impedance state, which blocks the signal transmission in the channel and plays a role of disconnecting the channel. In this way, the data signal connection between the second interface 12 and the third interface 13 is realized. At this time, the audio data of the mobile phone is connected to the digital-to-analog conversion unit 24 through the third channel of the second switching unit 232, and the digital-to-analog conversion unit 24 converts the audio data to the digital-to-analog conversion unit 24 through the third channel of the second switching unit 232. The data is converted into an analog audio signal, which is connected to the left and right channels of the earphone and the microphone to realize the conversion connection between the audio digital signal of the mobile phone and the analog earphone.

In an embodiment of the present invention, when the first interface 11 is connected to a charging adapter, a USB host (such as a computer, etc.) or a mobile power supply, the second interface 12 is connected to an external device (such as a mobile phone, a tablet computer, etc.), and the third interface 13 Connect an earphone device, at this time the fifth channel and the sixth channel of the switch unit 22 are respectively turned on, the charging device of the first interface 11 and the external device of the second interface 12 respectively establish a connection relationship with the protocol control unit 21, and then the protocol control The device access detection subunit of unit 21 detects the device connection of the first interface 11, the second interface 12, and the third interface 13, and communicates with the external device of the second interface through the configuration channel pin (CC Pin) of the external device At the same time, the charging handshaking protocol and the first data handshaking protocol are established. The on-off control sub-unit controls the seventh channel of the switch unit 22 and the third channel of the second switch unit to be in the on state according to the charging handshaking protocol and the first data handshaking protocol, and controls the fourth channel and the first channel. The switching unit is in a closed state, and the closed state of this embodiment is a high-impedance state, which blocks the transmission of signals in the channel and plays a role of disconnecting the channel. In this way, the data signal connection between the second interface 12 and the third interface 13 and the power connection between the first interface 11 and the second interface 12 are realized. At this time, the audio data of the mobile phone passes through the third interface of the second switching unit 232. The channel is connected to a digital-to-analog conversion unit 24, which converts the audio data into an analog audio signal, which is connected to the left and right channels of the earphone and the microphone to realize the conversion connection between the audio digital signal of the mobile phone and the analog earphone. At the same time, due to the conduction of the seventh channel of the switch unit 22, a power signal connection is established between the first interface 11 and the second interface 12 at the same time, so that the USB host (such as a computer, etc.) can be connected to a mobile phone (or tablet terminal device). ) To charge. That is, the charging function and the function of the earphone adapter cable are realized at the same time, so that the external devices (such as mobile phones, tablet computers, etc.) can be used to hear the external devices (such as mobile phones, tablet computers, etc.) through the audio interface while charging. Voice audio played

In summary, although the present invention has proposed a number of embodiments to disclose the technical content as above, these embodiments are not intended to limit the scope of protection of the present invention. Of course, the present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and All deformations shall fall within the scope of protection of the patent application attached to this new model.

11: The first interface

12: second interface

13: third interface

21: Protocol control unit

22: switch unit

23: switching unit

231: first switching unit

232: second switching unit

24: Digital analog conversion unit

Claims (17)

A multifunctional adapter device has a first interface, a second interface, and a third interface. The multifunctional adapter device includes: a switch unit electrically connected to the first interface and the second interface ; A switching unit, including a first switching unit and a second switching unit, the first switching unit is electrically connected to the first interface, the second interface, the second switching unit is electrically connected to the first Interface, said first switching unit; a digital-to-analog conversion unit electrically connected to said second switching unit and said third interface, said digital-to-analog conversion unit being used for said second switching unit and said third interface Signal conversion between interfaces; a protocol control unit, electrically connected to the first interface, the second interface, the third interface, the switch unit, the first switch unit, and the second switch Unit, the protocol control unit is used to detect the access devices of the first interface, the second interface, and the third interface, and establish a handshake protocol according to the access device; wherein, the protocol The control unit also controls the disconnection/conduction state of the switch unit, the first switch unit, and the second switch unit according to the handshaking protocol, so as to realize the connection between the first interface and the second interface /Or the signal connection between the third interfaces. In the multifunctional switching device according to claim 1, the protocol control unit includes a device access detection sub-unit and an on-off control sub-unit. In the multifunctional switching device according to claim 2, the signal includes a power signal and a data signal. In the multifunctional switching device according to claim 3, the handshaking protocol includes a charging handshaking protocol and a data handshaking protocol; wherein, the data handshaking protocol includes a first data handshaking protocol and a second data handshaking protocol. 2. Data Handshake Agreement. According to the multifunctional switching device according to claim 4, the switch unit is used to implement the first interface and/or the second interface to send a level signal to the protocol control unit, and the first interface The connection of the power signal with the second interface. In the multifunctional switching device according to claim 5, the first switching unit includes a first channel and a second channel, the second switching unit includes a third channel and a fourth channel, and the first switching unit includes a third channel and a fourth channel. One channel is used for the data signal communication between the first interface and the second interface, and the third channel is used for the data signal communication between the second interface and the third interface The fourth channel is used for the data signal communication between the first interface and the third interface; wherein, the on-off control sub-unit is used to control the first channel or the second channel and / Or the on/off state of the third channel or the fourth channel. The multifunctional switching device according to claim 6, the switch unit includes a fifth channel, a sixth channel, and a seventh channel, wherein the fifth channel is used for the first interface to connect to the The protocol control unit sends a level signal; the sixth channel is used for the second interface to send a level signal to the protocol control unit; the seventh channel is used for the first interface and the second interface The communication between the power signal. According to the multifunctional adapter device of claim 7, the first interface is used to plug in a charging device or a USB host, the second interface is used to plug in the access device, and the third interface Used to plug in an earphone, the fifth channel and the sixth channel are in a conductive state; the device access detection subunit is used to detect the first interface, the second interface, and the third interface And establish the charging handshaking protocol and the first data handshaking protocol with the access device of the second interface; the on-off control sub-unit is used to perform the charging according to the charging handshaking protocol. The handshaking protocol and the first data handshaking protocol control the third channel and the seventh channel to be in the on state, and control the fourth channel and the first switching unit to be in the off state. According to the multifunctional switching device according to claim 7, the first interface is used to plug in a charging device, the second interface is used to plug in the access device, the fifth channel and the first The six channels are in a conducting state; the device access detection subunit is used to detect the device access status of the first interface, the second interface, and the third interface, and communicate with the device access of the second interface The access device establishes the charging handshaking protocol; the on-off control subunit is used to control the seventh channel to be in the on state according to the charging handshaking protocol, the first switching unit and the second switching unit It is disconnected. According to the multifunctional switching device according to claim 7, the first interface is used to plug in a USB host, the second interface is used to plug in the access device, the fifth channel and the first The six channels are in a conducting state; the device access detection subunit is used to detect the device access status of the first interface, the second interface, and the third interface, and communicate with the device access of the second interface The access device establishes the second data handshaking protocol; the on-off control subunit is configured to control the first channel to be in the on state according to the second data handshaking protocol, and the second channel is connected to the first channel. The second switching unit is in the disconnected state. According to the multifunctional adapter device according to claim 7, the first interface is used to plug in a USB host, the third interface is used to plug in a headset, and the fifth channel is in a conducting state; the device The access detection subunit is used to detect the device access status of the first interface, the second interface, and the third interface; the on-off control subunit is used to control the device access status according to the device access status. The fourth channel is in a conducting state, and the third channel and the first switching unit are in a disconnected state. In the multifunctional switching device according to claim 7, the second interface is used to plug in the access device, the third interface is used to plug in a headset, and the sixth channel is in a conducting state; The device access detection subunit is used to detect the device access status of the first interface, the second interface, and the third interface, and establish the device with the access device of the second interface. The first data handshaking protocol; the on-off control subunit is used to control the third channel to be in the on state according to the first data handshaking protocol, and the fourth channel is disconnected from the first switching unit status. In the multifunctional adapter device according to claim 1, the first interface is a USB Type A interface. In the multifunctional adapter device according to claim 1, the first interface is a USB Type C interface. In the multifunctional adapter device according to claim 1, the second interface is a USB Type C interface. In the multifunctional switching device according to claim 1, the third interface is an audio interface. According to the multifunctional switching device according to claim 1, the access equipment includes a mobile phone, a tablet computer, and a notebook computer.

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