Communication connector
By combining Type-C and Type-A interfaces with optocoupler modules and signal conversion modules, the problem of MCU serial port signals being susceptible to interference is solved, achieving high anti-interference and high-speed transmission, which is suitable for multi-master device scenarios.
Patent Information
- Application Number
- CN202520299764.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-02-24
AI Technical Summary
The serial port signal of the MCU is easily interfered with when interacting with other devices at the TTL level, resulting in data corruption. Furthermore, existing technologies cannot effectively prevent device damage, and the transmission rate is low, which cannot meet the needs of high-speed communication.
The design employs both Type-C and Type-A interfaces, combined with optocoupler modules and signal conversion modules. The optocoupler module enables signal isolation transmission, while the signal conversion module converts UART signals to USB signals, eliminating circuit interference and improving anti-interference capabilities and transmission speed.
It achieves high anti-interference capabilities and faster data transmission speeds, ensuring the security and stability of signal transmission. It is suitable for multi-master device scenarios and reduces the risk of equipment damage.
Smart Images
Figure CN223785474U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to serial communication technical field, specifically about a communication connector. BACKGROUND
[0002] Serial communication, also known as serial communication, is a way of data exchange between computer and external device. Based on the principle of serial communication, data is sent out bit by bit in order through serial data line, and received bit by bit at the receiving end. Serial communication supports asynchronous and synchronous transmission mode, has lower transmission line quantity and lower cost, so it is widely used in many applications. The data format of serial communication includes binary data, printable characters, etc. Baud rate is an important parameter of serial communication, which represents the number of bits transmitted per second. Commonly used serial communication protocols include RS-232, RS-422, RS-485, USB, Modbus, CAN, I2C and SPI, etc. They are suitable for different communication scenes and needs. Through these technical background information, we can see the importance of serial communication line in data transmission and device connection, and its diversified application and technical evolution in continuous development.
[0003] However, in actual use, the serial port signal of MCU is always susceptible to various interferences when interacting with other devices at TTL level, resulting in data garbled, even device damage. The existing technical solutions mostly directly connect both ends of the serial port, and prevent interference by adding a shielding layer. This makes the requirements for wire higher, and the bending coefficient of the wire is reduced, which cannot completely eliminate the risk of device damage.
[0004] The transmission rate of traditional RS232 interface is relatively low, and the maximum speed is usually 115200bps, which is unacceptable for users who want to use high-speed communication. And the interface usually uses DB9 or DB25 connector, which contains many pins, which increases the complexity of physical connection and maintenance difficulty. SPI usually adopts master-slave mode, and the number of master devices is limited, which is not suitable for multi-master device scenarios. I2C communication is half-duplex, which cannot transmit data bidirectionally at the same time, which may limit the communication efficiency in some application scenarios. Therefore, using UART is currently the best solution for serial communication. However, UART communication is greatly affected by noise and interference.
[0005] The information disclosed in this BACKGROUND section is only intended to increase an understanding of the general background of the present utility model and is not intended to be a recognition or an implication that this information forms a prior art base that is already known to those of ordinary skill in the art. CONTENT OF THE UTILITY MODEL
[0006] The utility model discloses a communication connector which can have high anti-interference and faster data transmission speed, and solve the problem of difficult external transmission of MCU TTL level.
[0007] In order to realize the above-mentioned purpose, the utility model provides a technical scheme as follows:
[0008] A communication connector, comprising a Type-C interface, an optoelectronic coupling module, a signal conversion module and a Type-A interface, the Type-C interface is used for connecting external equipment and transmitting UART signals, the Type-A interface is used for connecting external equipment and transmitting USB signals, the optoelectronic coupling module is connected with the Type-C interface and the signal conversion module, the optoelectronic coupling module is used for isolated transmission of UART signals between the Type-C interface and the signal conversion module, the signal conversion module is connected with the Type-A interface, and the signal conversion module is used for conversion transmission of UART signals and USB signals.
[0009] In one or more embodiments of the utility model, the Type-C interface transmits UART signals through its own TXP pin and RXP pin.
[0010] In one or more embodiments of the utility model, the TXN pin and / or the RXN pin of the Type-C interface is connected with the ground pin of the Type-C interface.
[0011] In one or more embodiments of the utility model, the optoelectronic coupling module comprises a first optocoupler unit and a second optocoupler unit connected with the Type-C interface and the signal conversion module, the first optocoupler unit is used for isolated transmission of the first UART signal received by the Type-C interface to the signal conversion module, and the second optocoupler unit is used for isolated transmission of the second UART signal emitted by the signal conversion module to the Type-C interface.
[0012] In one or more embodiments of the utility model, the first optocoupler unit comprises a first light emitting unit and a first photosensitive unit optically coupled with the first light emitting unit, the input end of the first light emitting unit is connected with the Type-C interface to receive the first UART signal, and the output end of the first photosensitive unit is connected with the signal conversion module.
[0013] In one or more embodiments of the utility model, the power supply end of the first light emitting unit is connected with the power supply pin of the Type-C interface, and / or the power supply end of the first photosensitive unit is connected with the power supply pin of the Type-A interface, and / or the ground end of the first photosensitive unit is connected with the ground pin of the Type-A interface.
[0014] In one or more embodiments of the utility model, the second light coupling unit includes second light emitting unit and second photosensitive unit with second light emitting unit photo coupling, the input end of second light emitting unit is connected with signal conversion module to receive second UART signal, the output end of second photosensitive unit is connected with type C interface.
[0015] In one or more embodiments of the utility model, the power supply end of second light emitting unit is connected with the power supply pin of type A interface, and / or the power supply end of second photosensitive unit is connected with the power supply pin of type C interface, and / or the ground end of second photosensitive unit is connected with the ground pin of type C interface.
[0016] In one or more embodiments of the utility model, the power supply end of signal conversion module is connected with the power supply pin of type A interface, and the ground end of signal conversion module is connected with the ground pin of type A interface.
[0017] In one or more embodiments of the utility model, the signal conversion module includes CH340E chip.
[0018] Compared with prior art, the communication connector of the utility model adopts the interface of USB type to transmit and interact UART signal, and guarantees data transmission safety through setting photoelectric coupling module, and enhances anti-interference property.Meanwhile, the power supply and ground of two interfaces are not directly connected, and also carry out front and rear end isolation through photoelectric coupling module, effectively eliminate various circuit interference.Type-C interface does not use traditional Type-C protocol, and can be distinguished with standard equipment. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments in the utility model, and for ordinary skilled in the art, other drawings can be obtained according to these drawings without creating creative labor.
[0020] Figure 1 It is the structural schematic diagram of communication connector in an embodiment of the utility model.
[0021] Figure 2 It is the circuit principle diagram of type C interface in an embodiment of the utility model.
[0022] Figure 3 It is the circuit principle diagram of type A interface in an embodiment of the utility model.
[0023] Figure 4The circuit principle diagram of the photoelectric coupling module in the embodiment of the utility model.
[0024] Figure 5 The circuit principle diagram of the signal conversion module in the embodiment of the utility model. DETAILED DESCRIPTION
[0025] In order to make the person skilled in the art better understand the technical scheme in the utility model, the technical scheme in the embodiment of the utility model will be described clearly and completely in the following with reference to the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the utility model.
[0026] In the specification, "coupling" or "connection" or "connection" includes both direct connection and indirect connection. Indirect connection is the connection through intermediate medium, such as the connection through electrically conductive medium, which can have parasitic inductance or parasitic capacitance; indirect connection can also include the connection through other active devices or passive devices on the basis of achieving the same or similar functional purpose, such as the connection through switch, follow-up circuit or other circuit or component. In addition, in the specification, for example, the words "first", "second" and the like are mainly used to distinguish one technical feature from another technical feature, and do not necessarily require or imply a certain actual relationship, quantity or order between the technical features.
[0027] In the detailed description of the specification, the drawings forming a part thereof are referred to, wherein the same reference signs always represent the same components, and wherein the exemplary embodiments can be shown by way of example. It should be understood that other embodiments can be utilized without departing from the scope of the present application, and structural or logical changes can be made. Therefore, the following detailed description should not be regarded as limiting.
[0028] Various operations in the specification can be described in a sequential order for the purpose of facilitating understanding of the claimed subject matter. However, the order of description should not be interpreted as implying a sequential relatedness. Specifically, the operations can not be performed in the order presented. The described operations can be performed in a different order from the described embodiment. Various additional operations and / or the described operations can be performed in additional embodiments.
[0029] For the purposes of this application, the phrase "A and / or B" means (A), (B), or (A and B). For the purposes of this application, the phrase "A, B, and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).
[0030] Various components, devices, etc. can be referred to herein in singular form or in the plural form, but this is merely for convenience and brevity, and one of skill in the art will understand that when a singular form is used, this includes the plural.
[0031] The specification describes using the phrases "in one embodiment" or "in other embodiments" or "in some embodiments", which can each refer to one or more of the same or different embodiments. Furthermore, the terms "comprising", "including", "having" and the like, as used with respect to embodiments of the present application, are synonymous.
[0032] As Figure 1 shown, the communication connector in an embodiment of the present application includes a Type-C interface 10, an optoelectronic coupling module 20, a signal conversion module 30, and a Type-A interface 40.
[0033] The Type-C interface 10 is used to connect external devices and transmit UART signals, and the Type-A interface 40 is used to connect external devices and transmit USB signals. The optoelectronic coupling module 20 is connected to the Type-C interface 10 and the signal conversion module 30, and is used for isolated transmission of UART signals between the Type-C interface 10 and the signal conversion module 30. The signal conversion module 30 is connected to the Type-A interface 40, and is used for conversion and transmission of UART signals and USB signals.
[0034] In an embodiment, the Type-C interface 10 is used to connect a Type-C socket on a first external device, and the Type-A interface 40 is used to connect a Type-A socket on a second external device. The Type-C interface 10, the Type-C socket, the Type-A interface 40, and the Type-A socket can all be standard devices.
[0035] As Figure 2 shown, the power supply pins (pins A4, A9, B4, B9) of the Type-C interface 10 are connected to the power supply pins in the Type-C socket to receive a power supply voltage VDD in the first external device, and the ground pins (pins A1, A12, B1, B12, 25, 26) of the Type-C interface 10 are connected to the ground pins in the Type-C socket to receive a ground voltage GND in the first external device.
[0036] Preferably, the Type-C interface 10 transmits UART signals through its own TXP and RXP pins. Specifically, the TXP pins (pins A2 and B2) of the Type-C interface 10 are connected to the corresponding TXP pins in the Type-C socket, and the first external device outputs the UART signal Opt_Dout through the TXP pins of the Type-C socket. The RXP pins (pins A11 and B11) of the Type-C interface 10 are connected to the corresponding RXP pins in the Type-C socket, and the first external device receives the UART signal Opt_Din through the RXP pins of the Type-C socket.
[0037] Preferably, the RXN pin (pins A10, B10) of the Type-C interface 10 is connected to the ground pin of the Type-C interface 10. Since the Type-C interface 10 does not conform to the standard Type-C protocol (in the standard protocol, the DP pin and DN pin should be used as the transmission pins for the USB signals DATA_IN and DATA_OUT, but in this solution, the Type-C interface 10 transmits UART signals and does not need to use the DP pin and DN pin), the grounding state of the RXN pin can be used as a mark to identify this non-standard protocol. The first external device can identify this communication connector by reading the grounding state of the RXN pin and switch the communication protocol accordingly.
[0038] In other embodiments, the TXN pins (pins A3 and B3) of the Type-C interface 10 can also be connected to the ground pin of the Type-C interface 10, and the pins can be left ground as an identification mark. Alternatively, the RXN pins (pins A10 and B10) and TXN pins (pins A3 and B3) of the Type-C interface 10 can be connected to the ground pin of the Type-C interface 10, and the aforementioned pins can be left ground as an identification mark.
[0039] like Figure 3 As shown, the power pin (pin 1) of the Type-A interface 40 is used to connect to the power pin in the Type-A socket to receive the 5V power supply voltage from the second external device, and the ground pin (pins 4, 5, 6) of the Type-A interface 40 is used to connect to the ground pin in the Type-A socket to receive the ground voltage USBGND from the second external device.
[0040] The communication pins (pins 2 and 3) of the Type-A interface 40 are used to connect to the corresponding communication pins in the Type-A socket. The second external device transmits USB signals to this communication connector through the communication pins in the Type-A socket.
[0041] like Figure 4As shown, the optoelectronic coupling module 20 includes a first optocoupler unit 21 and a second optocoupler unit 22 connected to the Type-C interface 10 and the signal conversion module 30. The first optocoupler unit 21 is configured to transmit the first UART signal Opt_Dout received by the Type-C interface 10 to the signal conversion module 30, and the second optocoupler unit 22 is configured to transmit the second UART signal TXD sent by the signal conversion module 30 to the Type-C interface 10.
[0042] The first optocoupler unit 21 includes a first light emitting unit and a first light sensitive unit optically coupled to the first light emitting unit. The input end of the first light emitting unit is connected to the TXP pin (pin A2, B2) of the Type-C interface 10 to receive the first UART signal Opt_Dout, and the output end of the first light sensitive unit is connected to the signal conversion module 30.
[0043] Preferably, the power supply end of the first light emitting unit is connected to the power supply pin of the Type-C interface 10. The power supply end of the first light sensitive unit is connected to the power supply pin of the Type-A interface 40, and the ground end of the first light sensitive unit is connected to the ground pin of the Type-A interface 40.
[0044] In an embodiment, the first optocoupler unit 21 can be implemented based on an optocoupler chip U1, a resistor R1, a resistor R2 and a capacitor C1. The optocoupler chip U1 is preferably a TOSHIBA TLP2362 (TPL, E(T chip, which has the advantages of fast switching rate and low power consumption. The optocoupler chip U1 is internally integrated with a light emitting diode and a light sensitive output unit optically coupled to the light emitting diode. The light emitting diode and the resistor R1 form the first light emitting unit, and the light sensitive output unit, the resistor R2 and the capacitor C1 form the first light sensitive unit.
[0045] Specifically, the first end of the resistor R1 is used to form the power supply end of the first light emitting unit, the second end of the resistor R1 is connected to the anode (pin 1) of the light emitting diode, and the cathode (pin 3) of the light emitting diode is used to form the input end of the first light emitting unit. The resistor R1 is used for current limiting to prevent the light emitting diode from burning out.
[0046] The power supply end (pin 6) of the light sensitive output unit in the optocoupler chip U1 is used to form the power supply end of the first light sensitive unit, the ground end (pin 4) of the light sensitive output unit is used to form the ground end of the first light sensitive unit, the output end (pin 5) of the light sensitive output unit is used to form the output end of the first light sensitive unit, the first end of the resistor R2 and the first end of the capacitor C1 are connected to the power supply end of the light sensitive output unit, the second end of the resistor R2 is connected to the output end of the light sensitive output unit, and the second end of the capacitor C1 is connected to the ground end of the light sensitive output unit. The resistor R2 is used to pull up the output voltage of the light sensitive output unit to ensure the accuracy of the initial level and the stability during signal transmission.
[0047] When the light-emitting diode emits light based on the first UART signal Opt_Dout, the first light-sensitive unit generates a third UART signal RXD at its output end based on its light signal.
[0048] As shown in Figure 4 , the second light-emitting unit and the second light-sensitive unit are optically coupled, the input end of the second light-emitting unit is connected to the signal conversion module 30 to receive the second UART signal TXD, and the output end of the second light-sensitive unit is connected to the Type-C interface 10.
[0049] The power supply end of the second light-emitting unit is connected to the power supply pin (pin 1) of the Type-A interface 40. The power supply end of the second light-sensitive unit is connected to the power supply pin (pin A4, A9, B4, B9) of the Type-C interface 10, and the ground end of the second light-sensitive unit is connected to the ground pin (A1, A12, B1, B12, 25, 26) of the Type-C interface 10.
[0050] In an embodiment, the specific structure of the second light-emitting unit and the second light-sensitive unit is the same as that of the first light-emitting unit and the first light-sensitive unit, and the difference is only in the external connection, which will not be described in detail here. Both adopt the same working mode, the second light-emitting unit emits light based on the second UART signal TXD, and the second light-sensitive unit outputs a fourth UART signal Opt_Din at the output end based on its light signal.
[0051] In other embodiments, the first light-emitting unit, the first light-sensitive unit, the second light-emitting unit and the second light-sensitive unit can also adopt other circuit structures, or adopt other chips. It can be understood that the power supply end involved in the optoelectronic coupling module 20 refers to the port, pin or node in the specific unit or module for connecting the power voltage, the ground end refers to the port, pin or node in the specific unit or module for connecting the ground voltage, the input end refers to the port, pin or node in the specific unit or module for receiving signals, and the output end refers to the port, pin or node in the specific unit or module for outputting signals.
[0052] As shown in Figure 5 , the power supply end of the signal conversion module 30 is connected to the power supply pin (pin 1) of the Type-A interface 40, and the ground end of the signal conversion module 30 is connected to the ground pin (pin 4) of the Type-A interface 40.
[0053] Specifically, the signal conversion module 30 includes a conversion chip U3, and the model of the conversion chip U3 is preferably CH340E, which is a USB-to-serial chip.
[0054] The power pin (pin 5) of the conversion chip U3 is connected with the power pin (pin 1) of the Type-A interface 40, and the ground pin (pin 3) of the conversion chip U3 is connected with the ground pin (pin 4) of the Type-A interface 40.
[0055] The USB pins (pins 1, 2) of the conversion chip U3 are respectively connected with the communication pins (pins 2, 3) of the Type-A interface 40 to receive and output USB signals, the pin 7 of the conversion chip U3 is connected with the output end of the first light-sensitive unit to receive the third UART signal RXD, and the pin 6 of the conversion chip U3 is connected with the second light-emitting unit to output the second UART signal TXD.
[0056] The signal conversion module 30 can further include a capacitor C3 and a capacitor C4, the first end of the capacitor C3 is connected with the pin 8 of the conversion chip U3, the first end of the capacitor C4 is connected with the power pin (pin 5) of the conversion chip U3, and the second end of the capacitor C3 and the second end of the capacitor C4 are connected with the ground pin (pin 4) of the Type-A interface 40.
[0057] In an embodiment, the first UART signal Opt_Dout emitted by the first external device is a TTL level signal, and the power voltage VDD and the ground voltage GND in the first external device are reference voltages under the TTL level.
[0058] In actual work process, the first external device transmits the first UART signal Opt_Dout of the TTL level through the Type-C interface 10, and forms the third UART signal RXD based on the USB signal level after isolation conversion through the first optocoupler unit 21, and the conversion chip U3 converts the third UART signal RXD into the USB signal and outputs it to the second external device through the Type-A interface 40. Similarly, the conversion chip U3 also converts the USB signal into the second UART signal TXD, and forms the fourth UART signal Opt_Din based on the TTL level after isolation conversion through the second optocoupler unit 22, and finally is received by the first external device through the Type-C interface 10.
[0059] Through the photoelectric isolation of the first optocoupler unit 21 and the second optocoupler unit 22, the power, ground and signals on the Type-C interface 10 and the Type-A interface 40 do not have a direct coupling relationship, which ensures the safety of signal transmission and effectively eliminates various circuit interferences, and is also conducive to the level conversion and unification in the signal transmission process.
[0060] The Type-C interface 10 does not follow the standard protocol, adopts the TXP pin and the RXP pin to transmit the UART signal, and pulls down the RXN pin as a symbol of protocol replacement, which is conducive to the identification of the first external device.
[0061] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.
[0062] Furthermore, it should be understood that although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.
Claims
1. A communication connector, comprising: The application relates to a signal transmission device, which comprises a Type-C interface, an optoelectronic coupling module, a signal conversion module and a Type-A interface, the Type-C interface is used for connecting external equipment and transmitting UART signals, the Type-A interface is used for connecting external equipment and transmitting USB signals, the optoelectronic coupling module is connected with the Type-C interface and the signal conversion module, the optoelectronic coupling module is used for isolated transmission of UART signals between the Type-C interface and the signal conversion module, the signal conversion module is connected with the Type-A interface, and the signal conversion module is used for conversion transmission of UART signals and USB signals.
2. The communication connector of claim 1, wherein, The Type-C interface transmits UART signals through a Txp pin and an RXP pin of the Type-C interface.
3. The communication connector of claim 1, wherein, The TXN pin and / or the RXN pin of the Type-C interface is connected with a ground pin of the Type-C interface.
4. The communication connector of claim 1, wherein, The optoelectronic coupling module comprises a first optocoupler unit and a second optocoupler unit connected with the Type-C interface and the signal conversion module, the first optocoupler unit is used for isolated transmission of first UART signals received by the Type-C interface to the signal conversion module, and the second optocoupler unit is used for isolated transmission of second UART signals emitted by the signal conversion module to the Type-C interface.
5. The communication connector of claim 4, wherein, The first optocoupler unit comprises a first light-emitting unit and a first photosensitive unit optically coupled with the first light-emitting unit, an input end of the first light-emitting unit is connected with the Type-C interface to receive the first UART signals, and an output end of the first photosensitive unit is connected with the signal conversion module.
6. The communication connector of claim 5, wherein, The power supply end of the first light-emitting unit is connected with a power supply pin of the Type-C interface; and / or The power supply end of the first photosensitive unit is connected with a power supply pin of the Type-A interface; and / or The ground end of the first photosensitive unit is connected with a ground pin of the Type-A interface.
7. The communication connector of claim 4, wherein, The second optocoupler unit comprises a second light-emitting unit and a second photosensitive unit optically coupled with the second light-emitting unit, an input end of the second light-emitting unit is connected with the signal conversion module to receive the second UART signals, and an output end of the second photosensitive unit is connected with the Type-C interface.
8. The communication connector of claim 7, wherein, The power supply end of the second light-emitting unit is connected with a power supply pin of the Type-A interface; and / or The power supply end of the second photosensitive unit is connected with a power supply pin of the Type-C interface; and / or The ground end of the second photosensitive unit is connected with a ground pin of the Type-C interface.
9. The communication connector of claim 1, wherein, The power supply end of the signal conversion module is connected with a power supply pin of the Type-A interface, and the ground end of the signal conversion module is connected with a ground pin of the Type-A interface.
10. The communication connector of claim 1, wherein, The signal conversion module comprises a CH340E chip.