Vehicle-mounted Ethernet transmission circuit and terminal equipment

Abstract

The utility model relates to the technical field of Ethernet transmission, and discloses a vehicle-mounted Ethernet transmission circuit and terminal equipment, the vehicle-mounted Ethernet transmission circuit comprises a differential line port, an electric transmission module, a data transmission module and a blocking module with a blocking function; wherein the differential line port is respectively connected with the specified terminal and the blocking module and is used for transmitting electricity and / or data between the specified terminal and the blocking module; the blocking module is respectively connected with the electric transmission module and the data transmission module, and is used for transmitting power to the electric transmission module and transmitting data to the data transmission module based on a blocking function; the electric transmission module is connected with the electric transmission modules corresponding to the other terminals and is used for transmitting electricity with the electric transmission modules corresponding to the other terminals connected with the electric transmission modules; and the data transmission module is connected with the data transmission modules corresponding to the other terminals and is used for transmitting data with the data transmission modules corresponding to the connected other terminals. And the cost is reduced while wiring is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of Ethernet transmission, in particular to a vehicle-mounted Ethernet transmission circuit and a terminal device. Background Art

[0002] With the increasing intelligence of automobiles, while the requirements for intelligent data in automobiles are increasing, the miniaturization of devices is also an obvious trend in the development of in-vehicle networks. More and more devices need to be smaller and more compact in size.

[0003] For the network used to realize vehicle-mounted Ethernet transmission, the existing technology is the Po2P scheme. This scheme requires multiple pairs of data lines and corresponding more components to separately realize the transmission of electricity and data. The wiring is complex and the cost is high. Summary of the Utility Model

[0004] In view of this, the utility model provides a vehicle-mounted Ethernet transmission circuit and a terminal device to solve the problems of complex wiring and high cost in the existing scheme.

[0005] The utility model provides a vehicle-mounted Ethernet transmission circuit, which includes a differential line port, an electrical transmission module, a data transmission module, and a DC-blocking module with a DC-blocking function; wherein:

[0006] The differential line port is respectively connected to a specified terminal and the DC-blocking module, and is used for transmitting electricity and / or data between the specified terminal and the DC-blocking module;

[0007] The DC-blocking module is respectively connected to the electrical transmission module and the data transmission module, and is used for transmitting electricity between the electrical transmission module and the data transmission module based on the DC-blocking function, and transmitting data between the data transmission module and the data transmission module;

[0008] The electrical transmission module is connected to the electrical transmission modules corresponding to other terminals, and is used for transmitting electricity between the connected electrical transmission modules corresponding to other terminals;

[0009] The data transmission module is connected to the data transmission modules corresponding to other terminals, and is used for transmitting data between the connected data transmission modules corresponding to other terminals.

[0010] In one embodiment, the differential line port includes a first differential line port and a second differential line port, and the DC-blocking module includes a first capacitor and a second capacitor;

[0011] The first differential line port is connected to one end of the first capacitor, the second differential line port is connected to one end of the second capacitor, and the other ends of the first capacitor and the second capacitor are respectively connected to the electrical transmission module and the data transmission module.

[0012] In one embodiment, the electrical transmission module includes a first inductor, a second inductor, a third capacitor, and an electrical transmission port;

[0013] One end of the first inductor is connected to the first capacitor, and the other end is connected to the first end of the third capacitor; one end of the second inductor is connected to the second capacitor, and the other end is connected to the second end of the third capacitor and is simultaneously connected to the electrical transmission port; the electrical transmission port is connected to the corresponding electrical transmission port of other terminals connected to the electrical transmission module.

[0014] In one embodiment, the data transmission module includes a common mode inductor and a data transmission port, and the data transmission port includes a first data transmission port and a second data transmission port;

[0015] The first end of the common mode inductor is connected to the first capacitor, the second end is connected to the second capacitor, the third end is connected to the first data transmission port, and the fourth end is connected to the second data transmission port; the data transmission port is connected to the corresponding data transmission port of other terminals connected to the data transmission module.

[0016] In one embodiment, an anti-interference circuit is further included, and the anti-interference circuit includes a first resistor, a second resistor, a fourth capacitor, and a fifth capacitor;

[0017] One end of the first resistor is connected to the third end of the common mode inductor, the other end is connected to the first end of the fourth capacitor, and the second end of the fourth capacitor is grounded; one end of the second resistor is connected to the fourth end of the common mode inductor, the other end is connected to the first end of the fifth capacitor, and the second end of the fifth capacitor is grounded.

[0018] In one embodiment, a protection circuit is further included, and the protection circuit includes a first diode and a second diode;

[0019] The anodes of the first diode and the second diode are both grounded, the cathode of the first diode is connected to the first differential line port, and the cathode of the second diode is connected to the second differential line port.

[0020] In one embodiment, the first capacitor to the third capacitor are all 0.1 uF, the third capacitor and the fourth capacitor are 0.01 uF, the first inductor and the second inductor are 33 uH, and the first resistor and the second resistor are 1 k.

[0021] In one embodiment, the common mode inductor is an AE3003 inductor.

[0022] In addition, a terminal device is further provided, and the terminal device is provided with the above vehicle-mounted Ethernet transmission circuit.

[0023] This solution is different from the prior art which requires multiple pairs of data lines and corresponding more components to separately achieve the transmission of electricity and data. Instead, it realizes the preliminary transmission of electricity and data through the same line composed of differential line ports, DC-blocking modules, etc., and then realizes the subsequent transmission of electricity and data through separate branches, thereby effectively reducing the data lines and corresponding components required for the transmission of electricity and data, simplifying the wiring and reducing costs at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 FIG. 9 is a first schematic structural diagram of a vehicle-mounted Ethernet transmission circuit according to an embodiment of the present invention;

[0026] Figure 2 FIG. 13 is a second schematic structural diagram of a vehicle-mounted Ethernet transmission circuit according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0028] As Figure 1 shown, it shows a schematic structural diagram of a vehicle-mounted Ethernet transmission circuit provided by an embodiment of the present invention, which may include a differential line port, an electrical transmission module, a data transmission module, and a DC-blocking module with DC-blocking function; wherein:

[0029] The differential line port is respectively connected to a specified terminal and the DC-blocking module, and is used for transmitting electricity and / or data between the specified terminal and the DC-blocking module;

[0030] The DC-blocking module is respectively connected to the electrical transmission module and the data transmission module, and is used for transmitting electricity between the DC-blocking module and the electrical transmission module and transmitting data between the DC-blocking module and the data transmission module based on the DC-blocking function;

[0031] The electrical transmission module is connected to the corresponding electrical transmission modules of other terminals and is used to transmit electricity between the connected corresponding electrical transmission modules of other terminals.

[0032] The data transmission module is connected to the corresponding data transmission modules of other terminals and is used to transmit data between the connected corresponding data transmission modules of other terminals.

[0033] In the embodiment of the present utility model, the terminal is a device such as a chip (e.g., a PHY chip) connected to a vehicle-mounted Ethernet transmission circuit to realize the transmission of data and electricity with other terminals based on the vehicle-mounted Ethernet transmission circuit; the designated terminal is any terminal. Data and electricity can be transmitted between two terminals through the vehicle-mounted Ethernet transmission circuits they are respectively connected to; moreover, the same terminal can act as both a data sender and a data receiver, and can also act as both a power supply side and a power receiving side.

[0034] When the designated terminal acts as a data sender, the data (specifically differential data) is transmitted to the DC-blocking module through the differential line port. The DC-blocking module transmits the data to the data transmission module, and the data transmission module then transmits the data to the data transmission module on the opposite end; when the designated terminal acts as a data receiver, it is the reverse process of the above data transmission process, which will not be elaborated here. When the designated terminal acts as a power supply side, the electricity is transmitted to the DC-blocking module through the differential line port. The DC-blocking module transmits the electricity to the electrical transmission module, and the electrical transmission module then transmits the data to the electrical transmission module on the opposite end; when the designated terminal acts as a power receiving side, it is the reverse process of the above electrical transmission process, which will not be elaborated here. Among them, the DC-blocking module plays a DC-blocking function to avoid the interference of the transmitted electricity on the transmitted data, so as to realize that both electricity and data can be transmitted through the same route.

[0035] This solution is different from the prior art that requires multiple pairs of data lines and corresponding more components to separately realize the transmission of electricity and data. Instead, it realizes the preliminary transmission of electricity and data through the same line composed of a differential line port, a DC-blocking module, etc., and then realizes the subsequent transmission of electricity and data through separate branches, thereby effectively reducing the data lines and corresponding components required for the transmission of electricity and data, simplifying the wiring and reducing the cost at the same time.

[0036] As Figure 2 shown, it is a specific example diagram of a vehicle-mounted Ethernet transmission circuit provided by the embodiment of the present utility model. The following elaborates on this solution in detail based on this diagram.

[0037] As Figure 2 shown, in a vehicle-mounted Ethernet transmission circuit provided by the embodiment of the present utility model, the differential line port may include a first differential line port M0 and a second differential line port P0, and the DC-blocking module may include a first capacitor C1 and a second capacitor C2;

[0038] The first differential port is connected to one end of the first capacitor C1, and the second differential port is connected to one end of the second capacitor C2. The other ends of the first capacitor C1 and the second capacitor C2 are respectively connected to the electrical transmission module and the data transmission module.

[0039] In the embodiment of the present utility model, two coupling capacitors (the first capacitor C1 and the second capacitor C2 respectively) are adopted to block the DC signal and realize the DC blocking function; and the selection of the two coupling capacitors can be set according to actual needs. For example, capacitors of 0.1 uF can be selected for both. Thus, the DC blocking function can be realized through simple components, which can further simplify the circuit wiring and reduce the cost.

[0040] Such as Figure 2 shown, Figure 2 In [reference], TRD_M0 and TRD_P0 are interfaces on the specified terminal device that are respectively connected to the first differential line port M0 and the second differential line port P0 in a one-to-one correspondence. In a vehicle-mounted Ethernet transmission circuit provided by the embodiment of the present utility model, the electrical transmission module may include a first inductor L1, a second inductor L2, a third capacitor C3, and an electrical transmission port.

[0041] One end of the first inductor L1 is connected to the first capacitor C1, and the other end is connected to the first end of the third capacitor C3; one end of the second inductor L2 is connected to the second capacitor C2, and the other end is connected to the second end of the third capacitor C3 and is simultaneously connected to the electrical transmission port; the electrical transmission port is connected to the electrical transmission port of the electrical transmission module corresponding to other terminals connected to the electrical transmission module.

[0042] The electrical transmission module in the embodiment of the present utility model may include a first inductor L1, a second inductor L2, and a third capacitor C3, as well as an electrical transmission port (V_BR1, V_BR1); the first inductor L1 and the second inductor L2 may both be selected as inductors of 33 uH, and the third capacitor C3 may be selected as a coupling capacitor of 0.1 uF. Of course, corresponding components with other values can also be selected according to actual needs. The first inductor L1 and the second inductor L2 play a rectifying role, and the third capacitor C3 plays a role in filtering and voltage stabilizing, thereby improving the transmission electrical performance.

[0043] Such as Figure 2 shown, in a vehicle-mounted Ethernet transmission circuit provided by the embodiment of the present utility model, the data transmission module may include a common-mode inductor and a data transmission port, and the data transmission port may include a first data transmission port BR_N and a second data transmission port BR_P.

[0044] The first end of the common-mode inductor is connected to the first capacitor C1, the second end is connected to the second capacitor C2, the third end is connected to the first data transmission port BR_N, and the fourth end is connected to the second data transmission port BR_P; the data transmission port is connected to the data transmission port of the data transmission module corresponding to other terminals connected to the data transmission module.

[0045] In the on-vehicle Ethernet transmission circuit provided by the embodiment of the present utility model, an anti-interference circuit can also be included. The anti-interference circuit includes a first resistor R1, a second resistor R2, a fourth capacitor C4, and a fifth capacitor C5.

[0046] One end of the first resistor R1 is connected to the third end of the common-mode inductor, and the other end is connected to the first end of the fourth capacitor C4. The second end of the fourth capacitor C4 is grounded; one end of the second resistor R2 is connected to the fourth end of the common-mode inductor, and the other end is connected to the first end of the fifth capacitor C5. The second end of the fifth capacitor C5 is grounded.

[0047] In the embodiment of the present utility model, the data transmission module can include a common-mode inductor and data transmission ports. Among them, the common-mode inductor can be selected according to actual needs. For example, the AE3003 inductor can be selected, which plays a role in suppressing common-mode signals and filtering out corresponding interferences in the circuit; the two data transmission ports are connected to the data transmission ports of the opposite end one by one. At the same time, to further improve the anti-interference performance, the embodiment of the present utility model can also be provided with an anti-interference circuit, including two resistors and two capacitors, so that the anti-interference performance can be effectively improved through a simple circuit.

[0048] In addition, NI and P1 are signal transmission lines, and the signal transmission line can be shared with the power supply and power receiving electrical transmission.

[0049] Such as Figure 2 As shown, in the on-vehicle Ethernet transmission circuit provided by the embodiment of the present utility model, a protection circuit can also be included. The protection circuit includes a first diode and a second diode.

[0050] The anodes of the first diode and the second diode are both grounded. The cathode of the first diode is connected to the first differential line port M0, and the cathode of the second diode is connected to the second differential line port P0.

[0051] In the embodiment of the present utility model, to protect a specified terminal, a protection circuit is also provided. Specifically, it is implemented by two diodes, and these two diodes can be selected according to actual needs. For example, the RCLAMP0582BQ.TCT diode can be selected. Thus, while ensuring the circuit performance, the protection of the specified terminal can be realized, and the purpose of further reducing costs can be achieved.

[0052] In the on-vehicle Ethernet transmission circuit provided by the embodiment of the present utility model, the first capacitor C1 to the third capacitor C3 can all be 0.1 uF, the third capacitor C3 and the fourth capacitor C4 can be 0.01 uF, the first inductor L1 and the second inductor L2 can be 33 uH, and the first resistor R1 and the second resistor R2 can be 1 k. Of course, other settings made according to actual needs are also within the protection scope of the present utility model and will not be elaborated here.

[0053] It should be noted that IEEE 802.3bu and IEEE 802.3cg define the standard for power supply over data lines, namely PoDL (Power Over Data Line), which can support power supply from data lines to sensors or actuators within a range of 15 meters; it only requires a pair of data lines and does not require laying power lines. This not only solves the problem of inconvenient engineering power wiring but also saves the cost, time, and effort required for deploying the power supply system. In addition, PoDL has no strong electrical interference, greatly enhancing safety. The present utility model builds a vehicle-mounted Ethernet transmission circuit based on this to achieve functional debugging and optimization of various parameters of PoDL in practical applications, ensure the power output performance of PoDL, and improve the stability of the system.

[0054] In this solution, power supply is superimposed and transmitted on the data lines, that is, through a pair of network cables (connections in the vehicle-mounted Ethernet transmission circuit can be achieved through cables). The device can not only receive or transmit power but also send and receive data; the entire circuit is relatively simple and compact, saving material costs. Additionally, in practical applications, when the device connected to the network starts up, power supply and power reception can perform power negotiation; usually, the required power can be determined in advance and a fixed power can be used without negotiation, which can reduce the system startup time. When the network is disconnected, the power supply device will stop power supply to save electrical energy.

[0055] The function of integrating power supply and data transmission onto the same cable is particularly attractive for automobiles, reducing cables and thus directly reducing costs, which is quite important for the automotive industry with tight profit margins. At the same time, reducing cables means reducing weight, which helps improve fuel efficiency. PoDL eliminates the need for a separate power supply at the connected device or additional wiring and the inefficiency of long-distance power transmission, and can provide a maximum power of 50 watts over 40 meters.

[0056] The embodiment of the present utility model also provides a terminal device provided with the vehicle-mounted Ethernet transmission circuit described in any one of the above embodiments.

[0057] Although the embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A vehicle-mounted Ethernet transmission circuit, characterized in that: It includes a differential line port, an electrical transmission module, a data transmission module and a DC isolation module with a DC isolation function; wherein: The differential line port is connected to the designated terminal and the DC isolation module respectively, and is used to transmit electricity and / or data between the designated terminal and the DC isolation module; The DC isolation module is connected to the power transmission module and the data transmission module respectively, and is used to transmit power with the power transmission module and transmit data with the data transmission module based on the DC isolation function; The power transmission module is connected to the power transmission modules corresponding to other terminals, and is used to transmit electricity between the power transmission modules corresponding to other connected terminals; The data transmission module is connected to the data transmission modules corresponding to other terminals and is used to transmit data between the data transmission modules corresponding to the other connected terminals.

2. The vehicle-mounted Ethernet transmission circuit according to claim 1, characterized in that: The differential line port includes a first differential line port and a second differential line port, and the DC isolation module includes a first capacitor and a second capacitor; The first differential line port is connected to one end of the first capacitor, the second differential line port is connected to one end of the second capacitor, and the other ends of the first capacitor and the second capacitor are connected to the electrical transmission module and the data transmission module respectively.

3. The vehicle-mounted Ethernet transmission circuit according to claim 2, characterized in that: The electrical transmission module includes a first inductor, a second inductor, a third capacitor, and an electrical transmission port; One end of the first inductor is connected to the first capacitor, and the other end is connected to the first end of the third capacitor; one end of the second inductor is connected to the second capacitor, and the other end is connected to the second end of the third capacitor, and is also connected to the electrical transmission port; the electrical transmission port is connected to the electrical transmission port of the electrical transmission module corresponding to other terminals connected to the electrical transmission module.

4. The vehicle-mounted Ethernet transmission circuit according to claim 3, characterized in that: The data transmission module includes a common mode inductor and a data transmission port, and the data transmission port includes a first data transmission port and a second data transmission port; The first end of the common-mode inductor is connected to the first capacitor, the second end is connected to the second capacitor, the third end is connected to the first data transmission port, and the fourth end is connected to the second data transmission port; the data transmission port is connected to the data transmission port of the data transmission module corresponding to the other terminal connected to the data transmission module.

5. The vehicle-mounted Ethernet transmission circuit according to claim 4, characterized in that: Also includes an anti-interference circuit, the anti-interference circuit includes a first resistor, a second resistor, a fourth capacitor, and a fifth capacitor; One end of the first resistor is connected to the third end of the common-mode inductor, and the other end is connected to the first end of the fourth capacitor, and the second end of the fourth capacitor is grounded; one end of the second resistor is connected to the fourth end of the common-mode inductor, and the other end is connected to the first end of the fifth capacitor, and the second end of the fifth capacitor is grounded.

6. The vehicle-mounted Ethernet transmission circuit according to claim 5, characterized in that: Also included is a protection circuit, the protection circuit comprising a first diode and a second diode; Anodes of the first diode and the second diode are both grounded, a cathode of the first diode is connected to the first differential line port, and a cathode of the second diode is connected to the second differential line port.

7. The vehicle-mounted Ethernet transmission circuit according to claim 6, characterized in that: The first capacitor to the third capacitor are all 0.1uF, the third capacitor and the fourth capacitor are 0.01uF, the first inductor and the second inductor are 33uH, and the first resistor and the second resistor are 1k.

8. The vehicle-mounted Ethernet transmission circuit according to claim 7, characterized in that: The common mode inductor is an AE3003 inductor.

9. A terminal device, characterized in that: An in-vehicle Ethernet transmission circuit according to any one of claims 1 to 8 is provided.

Images