Protection circuit for Type-C interface transmission and USB device

Abstract

The utility model relates to a protection circuit for Type-C interface transmission and a USB device. The protection circuit comprises a connection unit, a Type-C protocol IC, a first electrostatic protection unit, a second electrostatic protection unit and a plurality of transmission cables. The connection unit is connected with the Type-C protocol IC through a plurality of transmission cables, the first electrostatic protection unit is arranged between the connection unit and the Type-C protocol IC in series, and the second electrostatic protection unit is connected with the connection unit; the connecting unit is connected with external equipment; the transmission cable executes signal / data transmission between the connection unit and the Type-C protocol IC; the first electrostatic protection unit suppresses static electricity on the transmission cable; the second electrostatic protection unit suppresses static electricity or transient voltage. According to the utility model, through the first electrostatic protection unit and the second electrostatic protection unit, the influence of static electricity generated in the hot plug and / or touch process on data transmission is effectively reduced, the stability and reliability of signal / data transmission are improved, and meanwhile, the influence of power surge and static electricity on equipment during charging can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of USB transmission, and more specifically, to a protection circuit and a USB device for Type-C interface transmission. Background Art

[0002] USB Type-C is a hardware interface specification for the Universal Serial Bus (USB). The highlights of this interface are its slimmer design, faster transmission speed (up to 10Gbps) and more powerful power transmission (100W). The biggest feature of Type-C double-sided pluggable is that it supports double-sided insertion of the USB interface, which officially solves the problem of "USB is never correct" and can be inserted from the front or back at will.

[0003] Since the Type-C interface supports hot-swap functions, the highly integrated chips inside it are more vulnerable to damage from electrostatic discharge from the human body. Electrostatic discharge may cause system crashes, data exchange interruptions, and even damage the interface and related circuits. In addition, the Type-C interface has a wide voltage range, high power, and high speed, and has stricter requirements on the data transmission fault tolerance rate. Therefore, electrostatic discharge will have a great impact on data transmission. Utility Model Content

[0004] The utility model aims at solving the problems existing in the prior art and provides a protection circuit and a USB device for Type-C interface transmission.

[0005] The technical solution adopted by the utility model to solve the technical problem is: constructing a protection circuit for Type-C interface transmission, including: a connection unit, a Type-C protocol IC, a first electrostatic protection unit, a second electrostatic protection unit and a plurality of transmission cables;

[0006] The connection unit is connected to the Type-C protocol IC through the multiple transmission cables, the first electrostatic protection unit is serially connected to the multiple transmission cables and is arranged between the connection unit and the Type-C protocol IC, and the second electrostatic protection unit is connected to the connection unit;

[0007] The connection unit is used to connect with an external device;

[0008] The transmission cable is used to perform signal transmission between the connection unit and the Type-C protocol IC;

[0009] The first electrostatic protection unit is used to suppress static electricity on the transmission cable;

[0010] The second electrostatic protection unit is used to suppress static electricity or transient voltage.

[0011] In the protection circuit for Type-C interface transmission described in the present invention, the connection unit is a Type-C double-sided connector.

[0012] In the protection circuit for Type-C interface transmission described in the utility model, the Type-C double-sided connector includes: a power pin, a ground pin, a high-speed signal transmission pin, a data transmission pin, a configuration channel pin, and an auxiliary communication pin;

[0013] The power pin is used to provide power to the connected device;

[0014] The ground pin is used to provide a ground signal for the circuit;

[0015] The high-speed signal transmission pin is used to transmit high-speed signals;

[0016] The data transmission pin is used to transmit data;

[0017] The configuration channel pins are used to determine the type and function of the connected device;

[0018] The auxiliary communication pin is used for synchronous transmission of audio signals and video signals.

[0019] In the protection circuit for Type-C interface transmission described in the utility model, the Type-C double-sided connector includes: a first group of pins, a second group of pins, a third group of pins and a fourth group of pins; the first electrostatic protection unit includes: a first electrostatic protection module, a second electrostatic protection module, a third electrostatic protection module and a fourth electrostatic protection module;

[0020] A first end of the first electrostatic protection module is connected to the first group of pins through a transmission cable, and a second end of the first electrostatic protection module is connected to the Type-C protocol IC through a transmission cable;

[0021] A first end of the second electrostatic protection module is connected to the second group of pins through a transmission cable, and a second end of the second electrostatic protection module is connected to the Type-C protocol IC through a transmission cable;

[0022] The first end of the third electrostatic protection module is connected to the third group of pins through a transmission cable, and the second end of the third electrostatic protection module is connected to the Type-C protocol IC through a transmission cable;

[0023] The first end of the fourth electrostatic protection module is connected to the fourth group of pins through a transmission cable, and the second end of the fourth electrostatic protection module is connected to the Type-C protocol IC through a transmission cable.

[0024] In the protection circuit for Type-C interface transmission described in the utility model, the first group of pins includes: a first positive signal sending pin, a first negative signal sending pin, a first positive signal receiving pin and a first negative signal receiving pin; the second group of pins includes: a first power pin, a second auxiliary communication pin, a first configuration channel pin and a first negative data transmission pin; the third group of pins includes: a second positive data transmission pin, a second negative data transmission pin, a second configuration channel pin and a first auxiliary communication pin; the fourth group of pins includes: a second negative signal sending pin, a second positive signal sending pin, a second positive signal receiving pin and a second negative signal receiving pin;

[0025] The first electrostatic protection module includes: a first electrostatic protection diode; the second electrostatic protection module includes: a second electrostatic protection diode; the third electrostatic protection module includes: a third electrostatic protection diode; the fourth electrostatic protection module includes: a fourth electrostatic protection diode;

[0026] The first end of the first electrostatic protection diode is connected to the first positive signal receiving pin, the second end of the first electrostatic protection diode is connected to the first positive signal sending pin, the third end of the first electrostatic protection diode is grounded, the fourth end of the first electrostatic protection diode is connected to the first negative signal receiving pin, the fifth end of the first electrostatic protection diode is connected to the first negative signal sending pin, and the sixth end, the seventh end, the ninth end and the tenth end of the first electrostatic protection diode are respectively connected to the pins corresponding to the Type-C protocol IC through transmission cables;

[0027] The first end of the second electrostatic protection diode is connected to the first power pin, the second end of the second electrostatic protection diode is connected to the second auxiliary communication pin, the third end of the second electrostatic protection diode is connected to the first configuration channel pin, the fourth end of the second electrostatic protection diode is grounded, the fifth end of the second electrostatic protection diode is connected to the first negative data transmission pin, and the sixth end, the eighth end and the ninth end of the second electrostatic protection diode are respectively connected to the pins corresponding to the Type-C protocol IC through transmission cables;

[0028] The first end of the third electrostatic protection diode is connected to the second positive data transmission pin, the second end of the third electrostatic protection diode is connected to the second negative data transmission pin, the third end of the third electrostatic protection diode is grounded, the fourth end of the third electrostatic protection diode is connected to the second configuration channel pin, the fifth end of the third electrostatic protection diode is connected to the first auxiliary communication pin, and the sixth end, the seventh end, the ninth end and the tenth end of the third electrostatic protection diode are respectively connected to the pins corresponding to the Type-C protocol IC through transmission cables;

[0029] The first end of the fourth electrostatic protection diode is connected to the second negative signal sending pin, the second end of the fourth electrostatic protection diode is connected to the second negative signal receiving pin, the third end of the fourth electrostatic protection diode is grounded, the fourth end of the fourth electrostatic protection diode is connected to the second positive signal sending pin, the fifth end of the fourth electrostatic protection diode is connected to the second positive signal receiving pin, and the sixth end, the seventh end, the ninth end and the tenth end of the fourth electrostatic protection diode are respectively connected to the corresponding pins of the Type-C protocol IC through transmission cables.

[0030] In the protection circuit for Type-C interface transmission described in the utility model, the first electrostatic protection diode, the second electrostatic protection diode, the third electrostatic protection diode and the fourth electrostatic protection diode are all electrostatic protection diodes with small capacitance values.

[0031] In the protection circuit for Type-C interface transmission described in the utility model, the second electrostatic protection unit includes: a fifth electrostatic protection module;

[0032] The first end of the fifth electrostatic protection module is respectively connected to the second power pin, the third power pin and the fourth power pin, and the second end of the fifth electrostatic protection module is grounded.

[0033] In the protection circuit for Type-C interface transmission described in the utility model, the fifth electrostatic protection module includes: a fifth electrostatic protection diode.

[0034] In the protection circuit for Type-C interface transmission described in the utility model, the fifth electrostatic protection diode is a high-power electrostatic protection diode.

[0035] The utility model also provides a USB device, comprising: the above-mentioned protection circuit for Type-C interface transmission.

[0036] The protection circuit and USB device for Type-C interface transmission of the utility model have the following beneficial effects: including: a connection unit, a Type-C protocol IC, a first electrostatic protection unit, a second electrostatic protection unit and a plurality of transmission cables; the connection unit is connected to the Type-C protocol IC through a plurality of transmission cables, the first electrostatic protection unit string is arranged between the connection unit and the Type-C protocol IC, and the second electrostatic protection unit is connected to the connection unit; the connection unit is connected to an external device; the transmission cable performs signal / data transmission between the connection unit and the Type-C protocol IC; the first electrostatic protection unit suppresses static electricity on the transmission cable; the second electrostatic protection unit suppresses static electricity or transient voltage. The utility model effectively reduces the influence of static electricity generated during hot plugging and / or touching on data transmission through the first electrostatic protection unit and the second electrostatic protection unit, improves the stability and reliability of signal / data transmission, and can also avoid the influence of power surge and static electricity on the device during charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0038] Figure 1 This is a principle block diagram of a protection circuit for Type-C interface transmission provided by the utility model;

[0039] Figure 2 It is a circuit diagram of a protection circuit for Type-C interface transmission provided by the utility model. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] refer to Figure 1 , Figure 1 An embodiment of a protection circuit for Type-C interface transmission provided by the utility model is shown.

[0042] Specifically, Figure 1 As shown, the protection circuit for Type-C interface transmission includes: a connection unit 11, a Type-C protocol IC 12, a first electrostatic protection unit 13, a second electrostatic protection unit 14 and a plurality of transmission cables.

[0043] Among them, the connection unit 11 and the Type-C protocol IC 12 are connected through multiple transmission cables, the first electrostatic protection unit 13 is connected in series to the multiple transmission cables and is arranged between the connection unit 11 and the Type-C protocol IC 12, and the second electrostatic protection unit 14 is connected to the connection unit 11.

[0044] Specifically, in this embodiment, the connection unit 11 is used to connect to an external device; the transmission cable is used to perform signal transmission between the connection unit 11 and the Type-C protocol IC 12; the first electrostatic protection unit 13 is used to suppress static electricity on the transmission cable; and the second electrostatic protection unit 14 is used to suppress static electricity or transient voltage.

[0045] In this embodiment, by setting the first electrostatic protection unit 13 and the second electrostatic protection unit 14, the influence of static electricity generated during hot plugging and touching on data transmission can be effectively reduced. At the same time, damage to the device caused by power surges and static electricity during charging can be avoided, thereby improving the stability of the Type-C transmission interface and the reliability of the interface.

[0046] Optionally, in this embodiment, the connection unit 11 may be a connector. The number of pins of the connector is specifically based on the number of actual Type-C interfaces. Preferably, in this embodiment, the connection unit 11 is a Type-C double-sided connector.

[0047] In this embodiment, the Type-C double-sided connector includes: a power pin, a ground pin, a high-speed signal transmission pin, a data transmission pin, a configuration channel pin, and an auxiliary communication pin.

[0048] The power pin is used to provide power to the connected device. Specifically, the power pin can provide power to the connected device, and the power pin can provide a stable power supply regardless of whether the device is inserted forward or reversely.

[0049] In this embodiment, the ground pin is used to provide a ground signal for the circuit. Specifically, in the Type-C interface, the ground pin ensures the stability and safety of the circuit and can prevent power leakage and circuit damage.

[0050] In this embodiment, the high-speed signal transmission pin is used to transmit a high-speed signal.

[0051] In this embodiment, the data transmission pin is used to transmit data.

[0052] In this embodiment, the configuration channel pin is used to determine the type and function of the connected device. Specifically, the configuration channel pin can determine the type and function of the connected device so that the interface can be correctly configured and operated.

[0053] In this embodiment, the auxiliary communication pin is used for audio signal transmission and video signal synchronous transmission. Specifically, the auxiliary communication pin is an auxiliary communication pin of the Type-C interface, which is mainly used for operations such as audio signal transmission and video signal synchronous transmission.

[0054] Optionally, in this embodiment, the Type-C double-sided connector includes: a first group of pins, a second group of pins, a third group of pins and a fourth group of pins. Correspondingly, the first electrostatic protection unit 13 can be provided with: a first electrostatic protection module, a second electrostatic protection module, a third electrostatic protection module and a fourth electrostatic protection module.

[0055] Among them, the first end of the first electrostatic protection module is connected to the first group of pins through a transmission cable, and the second end of the first electrostatic protection module is connected to the Type-C protocol IC 12 through a transmission cable; the first end of the second electrostatic protection module is connected to the second group of pins through a transmission cable, and the second end of the second electrostatic protection module is connected to the Type-C protocol IC 12 through a transmission cable; the first end of the third electrostatic protection module is connected to the third group of pins through a transmission cable, and the second end of the third electrostatic protection module is connected to the Type-C protocol IC 12 through a transmission cable; the first end of the fourth electrostatic protection module is connected to the fourth group of pins through a transmission cable, and the second end of the fourth electrostatic protection module is connected to the Type-C protocol IC 12 through a transmission cable.

[0056] In a preferred embodiment, if Figure 2 As shown, the first group of pins includes: a first positive signal sending pin (such as Figure 2 A2 pin in the middle), the first negative signal sending pin (such as Figure 2 A3 pin in the middle), the first positive signal receiving pin (such as Figure 2 B11 pin) and the first negative signal receiving pin (such as Figure 2 The second group of pins includes: the first power supply pin (such as Figure 2 B9 pin in the middle), the second auxiliary communication pin (such as Figure 2 B8 pin in the middle), the first configuration channel pin (such as Figure 2 A5 pin) and the first negative data transmission pin (such as Figure 2 The third group of pins includes: the second positive data transmission pin (such as Figure 2 B6 pin), the second negative data transmission pin (such as Figure 2 A7 pin in the middle), the second configuration channel pin (such as Figure 2 B5 pin) and the first auxiliary communication pin (such as Figure 2 The fourth group of pins includes: the second negative signal sending pin (such as Figure 2 B3 pin in the middle), the second positive signal sending pin (such as Figure 2B2 pin in the middle), the second positive signal receiving pin (such as Figure 2 A11 pin) and the second negative signal receiving pin (such as Figure 2 A10 pin in the middle).

[0057] like Figure 2 As shown, VBUS is the power pin, GND is the ground pin, and the four pairs of pins TX+, TX-, RX+ and RX- are used for high-speed signal transmission of USB3.0. Among them, TX+ and TX- represent the transmitting end, which are used to send data; RX+ and RX- represent the receiving end, which are used to receive data. D+ / D- are the data transmission pins of USB2.0, which are used to transmit data under the USB2.0 protocol. The two pins CC1 and CC2 are the configuration channel pins of the Type-C interface. They are used to determine the type and function of the connected device so that the interface can be configured and operated correctly. The SBU1 / SBU2 pins are the auxiliary communication pins of the Type-C interface, which are mainly used for operations such as audio signal transmission and synchronous transmission of video signals. Among them, Figure 2 Only some pins of the Type-C protocol IC 12 are illustrated, and other parts of the Type-C protocol IC 12 are not illustrated.

[0058] like Figure 2 As shown, in this embodiment, the first electrostatic protection module includes: a first electrostatic protection diode D1; the second electrostatic protection module includes: a second electrostatic protection diode D2; the third electrostatic protection module includes: a third electrostatic protection diode D3; and the fourth electrostatic protection module includes: a fourth electrostatic protection diode D4.

[0059] The first end of the first electrostatic protection diode D1 is connected to the first positive signal receiving pin, the second end of the first electrostatic protection diode D1 is connected to the first positive signal sending pin, the third end of the first electrostatic protection diode D1 is grounded, the fourth end of the first electrostatic protection diode D1 is connected to the first negative signal receiving pin, the fifth end of the first electrostatic protection diode D1 is connected to the first negative signal sending pin, and the sixth end, the seventh end, the ninth end and the tenth end of the first electrostatic protection diode D1 are respectively connected to the corresponding pins of the Type-C protocol IC 12 through the transmission cable. Specifically, as Figure 2 As shown, the sixth end of the first electrostatic protection diode D1 is connected to the TX1- pin of the Type-C protocol IC 12, the seventh end of the first electrostatic protection diode D1 is connected to the RX1- pin of the Type-C protocol IC 12, the ninth end of the first electrostatic protection diode D1 is connected to the TX1+ pin of the Type-C protocol IC 12, and the tenth end of the first electrostatic protection diode D1 is connected to the RX1+ pin of the Type-C protocol IC 12.

[0060] The first end of the second electrostatic protection diode D2 is connected to the first power pin, the second end of the second electrostatic protection diode D2 is connected to the second auxiliary communication pin, the third end of the second electrostatic protection diode D2 is connected to the first configuration channel pin, the fourth end of the second electrostatic protection diode D2 is grounded, the fifth end of the second electrostatic protection diode D2 is connected to the first negative data transmission pin, and the sixth end, the eighth end and the ninth end of the second electrostatic protection diode D2 are respectively connected to the corresponding pins of the Type-C protocol IC 12 through the transmission cable. Figure 2 As shown, the sixth end of the second electrostatic protection diode D2 is connected to the D- pin of the Type-C protocol IC 12, the eighth end of the second electrostatic protection diode D2 is connected to the CC1 pin of the Type-C protocol IC 12, and the ninth pin of the second electrostatic protection diode D2 is connected to the SBU2 pin of the Type-C protocol IC 12.

[0061] The first end of the third electrostatic protection diode D3 is connected to the second positive data transmission pin, the second end of the third electrostatic protection diode D3 is connected to the second negative data transmission pin, the third end of the third electrostatic protection diode D3 is grounded, the fourth end of the third electrostatic protection diode D3 is connected to the second configuration channel pin, the fifth end of the third electrostatic protection diode D3 is connected to the first auxiliary communication pin, and the sixth end, the seventh end, the ninth end and the tenth end of the third electrostatic protection diode D3 are respectively connected to the corresponding pins of the Type-C protocol IC 12 through the transmission cable. Figure 2 As shown, the sixth end of the third electrostatic protection diode D3 is connected to the SBU1 pin of the Type-C protocol IC 12, the seventh end of the third electrostatic protection diode D3 is connected to the CC2 pin of the Type-C protocol IC 12, the ninth end of the third electrostatic protection diode D3 is connected to the D- pin of the Type-C protocol IC 12, and the tenth end of the third electrostatic protection diode D3 is connected to the D+ pin of the Type-C protocol IC 12.

[0062] The first end of the fourth electrostatic protection diode D4 is connected to the second negative signal sending pin, the second end of the fourth electrostatic protection diode D4 is connected to the second negative signal receiving pin, the third end of the fourth electrostatic protection diode D4 is grounded, the fourth end of the fourth electrostatic protection diode D4 is connected to the second positive signal sending pin, the fifth end of the fourth electrostatic protection diode D4 is connected to the second positive signal receiving pin, and the sixth end, the seventh end, the ninth end and the tenth end of the fourth electrostatic protection diode D4 are respectively connected to the corresponding pins of the Type-C protocol IC 12 through the transmission cable. Figure 2As shown, the sixth end of the fourth electrostatic protection diode D4 is connected to the RX2+ pin of the Type-C protocol IC 12, the seventh end of the fourth electrostatic protection diode D4 is connected to the TX2+ pin of the Type-C protocol IC 12, the ninth end of the fourth electrostatic protection diode D4 is connected to the RX2- pin of the Type-C protocol IC 12, and the tenth end of the fourth electrostatic protection diode D4 is connected to the TX2- pin of the Type-C protocol IC 12.

[0063] Preferably, the first electrostatic protection diode D1, the second electrostatic protection diode D2, the third electrostatic protection diode D3 and the fourth electrostatic protection diode D4 are all electrostatic protection diodes with small capacitance values. Figure 2 As shown, correspondingly, 16 signal lines (i.e., 16 transmission cables) are required, and electrostatic protection diodes are connected between them. Figure 2 Four ESD electrostatic protection diodes that can protect four lines are selected. Of course, it can be understood that in some other embodiments, an ESD electrostatic protection diode that protects a single line can also be selected, or an ESD electrostatic protection diode that protects two lines can be selected. The specific selection can be flexibly made, and the utility model does not make specific limitations. It should be noted that since Type-C data transmission is relatively fast, the selected ESD electrostatic protection diode should be selected with a smaller capacitance value, and generally an ESD electrostatic protection diode within 1pf can be selected. By connecting ESD electrostatic protection diodes between the 16 signal lines, the influence of static electricity on data transmission can be avoided, the stability and reliability of device connection can be ensured, and the quality and speed of data transmission can be improved.

[0064] In this embodiment, the second electrostatic protection unit 14 includes: a fifth electrostatic protection module. The first end of the fifth electrostatic protection module is respectively connected to the second power pin (such as Figure 2 B9 pin in the Figure 2 B4 pin in the Figure 2 A9 pin in

[0065] The second end of the fifth electrostatic protection module is grounded. The tenth end of the second surface electrostatic protection diode is also connected to the first end of the fifth electrostatic protection module.

[0066] Optionally, in this embodiment, the fifth electrostatic protection module includes: a fifth electrostatic protection diode D5. Preferably, the fifth electrostatic protection diode D5 is a high-power electrostatic protection diode. In this embodiment, by adding a separate ESD electrostatic protection diode between the VBUS pin and GND, the influence of static electricity or transient voltage on the device can be effectively suppressed. Among them, since it is a power line, the fifth electrostatic protection diode D5 needs to use a high-power ESD electrostatic protection diode, generally more than 300W can be selected.

[0067] The utility model also provides a USB device, wherein the USB device may include: a protection circuit for Type-C interface transmission disclosed in an embodiment of the utility model.

[0068] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot limit the protection scope of the utility model. All equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A protection circuit for Type-C interface transmission, characterized in that: include: A connection unit, a Type-C protocol IC, a first electrostatic protection unit, a second electrostatic protection unit, and a plurality of transmission cables; The connection unit is connected to the Type-C protocol IC through the multiple transmission cables, the first electrostatic protection unit is serially connected to the multiple transmission cables and is arranged between the connection unit and the Type-C protocol IC, and the second electrostatic protection unit is connected to the connection unit; The connection unit is used to connect with an external device; The transmission cable is used to perform signal transmission between the connection unit and the Type-C protocol IC; The first electrostatic protection unit is used to suppress static electricity on the transmission cable; The second electrostatic protection unit is used to suppress static electricity or transient voltage.

2. The protection circuit for Type-C interface transmission according to claim 1, characterized in that: The connection unit is a Type-C double-sided connector.

3. The protection circuit for Type-C interface transmission according to claim 2, characterized in that: The Type-C double-sided connector includes: a power pin, a ground pin, a high-speed signal transmission pin, a data transmission pin, a configuration channel pin, and an auxiliary communication pin; The power pin is used to provide power to the connected device; The ground pin is used to provide a ground signal for the circuit; The high-speed signal transmission pin is used to transmit high-speed signals; The data transmission pin is used to transmit data; The configuration channel pins are used to determine the type and function of the connected device; The auxiliary communication pin is used for synchronous transmission of audio signals and video signals.

4. The protection circuit for Type-C interface transmission according to claim 2, characterized in that: The Type-C double-sided connector includes: a first group of pins, a second group of pins, a third group of pins and a fourth group of pins; the first electrostatic protection unit includes: a first electrostatic protection module, a second electrostatic protection module, a third electrostatic protection module and a fourth electrostatic protection module; A first end of the first electrostatic protection module is connected to the first group of pins through a transmission cable, and a second end of the first electrostatic protection module is connected to the Type-C protocol IC through a transmission cable; A first end of the second electrostatic protection module is connected to the second group of pins through a transmission cable, and a second end of the second electrostatic protection module is connected to the Type-C protocol IC through a transmission cable; The first end of the third electrostatic protection module is connected to the third group of pins through a transmission cable, and the second end of the third electrostatic protection module is connected to the Type-C protocol IC through a transmission cable; The first end of the fourth electrostatic protection module is connected to the fourth group of pins through a transmission cable, and the second end of the fourth electrostatic protection module is connected to the Type-C protocol IC through a transmission cable.

5. The protection circuit for Type-C interface transmission according to claim 4, characterized in that: The first group of pins includes: a first positive signal sending pin, a first negative signal sending pin, a first positive signal receiving pin and a first negative signal receiving pin; the second group of pins includes: a first power pin, a second auxiliary communication pin, a first configuration channel pin and a first negative data transmission pin; the third group of pins includes: a second positive data transmission pin, a second negative data transmission pin, a second configuration channel pin and a first auxiliary communication pin; the fourth group of pins includes: a second negative signal sending pin, a second positive signal sending pin, a second positive signal receiving pin and a second negative signal receiving pin; The first electrostatic protection module includes: a first electrostatic protection diode; the second electrostatic protection module includes: a second electrostatic protection diode; the third electrostatic protection module includes: a third electrostatic protection diode; the fourth electrostatic protection module includes: a fourth electrostatic protection diode; The first end of the first electrostatic protection diode is connected to the first positive signal receiving pin, the second end of the first electrostatic protection diode is connected to the first positive signal sending pin, the third end of the first electrostatic protection diode is grounded, the fourth end of the first electrostatic protection diode is connected to the first negative signal receiving pin, the fifth end of the first electrostatic protection diode is connected to the first negative signal sending pin, and the sixth end, the seventh end, the ninth end and the tenth end of the first electrostatic protection diode are respectively connected to the pins corresponding to the Type-C protocol IC through transmission cables; The first end of the second electrostatic protection diode is connected to the first power pin, the second end of the second electrostatic protection diode is connected to the second auxiliary communication pin, the third end of the second electrostatic protection diode is connected to the first configuration channel pin, the fourth end of the second electrostatic protection diode is grounded, the fifth end of the second electrostatic protection diode is connected to the first negative data transmission pin, and the sixth end, the eighth end and the ninth end of the second electrostatic protection diode are respectively connected to the pins corresponding to the Type-C protocol IC through transmission cables; The first end of the third electrostatic protection diode is connected to the second positive data transmission pin, the second end of the third electrostatic protection diode is connected to the second negative data transmission pin, the third end of the third electrostatic protection diode is grounded, the fourth end of the third electrostatic protection diode is connected to the second configuration channel pin, the fifth end of the third electrostatic protection diode is connected to the first auxiliary communication pin, and the sixth end, the seventh end, the ninth end and the tenth end of the third electrostatic protection diode are respectively connected to the pins corresponding to the Type-C protocol IC through transmission cables; The first end of the fourth electrostatic protection diode is connected to the second negative signal sending pin, the second end of the fourth electrostatic protection diode is connected to the second negative signal receiving pin, the third end of the fourth electrostatic protection diode is grounded, the fourth end of the fourth electrostatic protection diode is connected to the second positive signal sending pin, the fifth end of the fourth electrostatic protection diode is connected to the second positive signal receiving pin, and the sixth end, the seventh end, the ninth end and the tenth end of the fourth electrostatic protection diode are respectively connected to the corresponding pins of the Type-C protocol IC through transmission cables.

6. The protection circuit for Type-C interface transmission according to claim 5, characterized in that: The first electrostatic protection diode, the second electrostatic protection diode, the third electrostatic protection diode and the fourth electrostatic protection diode are all electrostatic protection diodes with small capacitance values.

7. The protection circuit for Type-C interface transmission according to claim 3, characterized in that: The second electrostatic protection unit includes: a fifth electrostatic protection module; The first end of the fifth electrostatic protection module is respectively connected to the second power pin, the third power pin and the fourth power pin, and the second end of the fifth electrostatic protection module is grounded.

8. The protection circuit for Type-C interface transmission according to claim 7, characterized in that: The fifth electrostatic protection module includes: a fifth electrostatic protection diode.

9. The protection circuit for Type-C interface transmission according to claim 8, characterized in that: The fifth electrostatic protection diode is a high-power electrostatic protection diode.

10. A USB device, characterized in that: include: The protection circuit for Type-C interface transmission as described in any one of claims 1 to 9.

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