Vehicle-mounted ethernet communication plug-in

Abstract

The application provides a vehicle-mounted Ethernet communication plug-in. The plug-in comprises an MCU unit, a switching chip, a PHY chip, a high-speed signal connector and a power connector. The MCU unit is configured to configure and manage the switching chip. The switching chip is connected with the PHY chip, the high-speed signal connector and the power connector, and is configured to provide at least two gigabit Ethernet interfaces and at least nine first hundred megabit Ethernet interfaces. One of the two gigabit Ethernet interfaces provides DC48V standard POE power supply externally through the power connector, and the other one of the two gigabit Ethernet interfaces is connected with a vehicle-mounted main control unit through the high-speed signal connector. The at least nine first hundred megabit Ethernet interfaces are respectively connected with one service unit through the high-speed signal connector.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to an in-vehicle Ethernet communication plug-in. Background Technology

[0002] Current systems such as the Dynamic Monitoring System (DMS), the Operation Information Analysis System (EOAS) for EMU drivers, the Safety Auxiliary Protection System (LSP) for shunting operations, and the Good Manufacturing Practice (GDK) for railcar shunting operations are all based on the DMS platform. However, this platform was designed and finalized relatively early, which restricts the functional expansion of current systems. Therefore, a new hardware platform needs to be designed to adapt to new product requirements. Furthermore, to accommodate the new hardware platform and achieve high-speed data transmission with it, a new onboard communication device needs to be designed. Summary of the Invention

[0003] In order to achieve high-speed data interaction with the new hardware platform while adapting to it, this invention provides an in-vehicle Ethernet communication plug-in.

[0004] The present invention provides an in-vehicle Ethernet communication plug-in, comprising: an MCU unit, a switching chip, a PHY chip, a high-speed signal connector, and a power connector;

[0005] The MCU unit is used to configure and manage the switching chip;

[0006] The switching chip, connected to the PHY chip, the high-speed signal connector, and the power connector, is used to provide at least two gigabit Ethernet interfaces and at least nine 100 Mbps Ethernet interfaces. One gigabit Ethernet interface provides standard DC48V PoE power to the outside world through the power connector, and the other gigabit Ethernet interface is connected to the vehicle main control unit through the high-speed signal connector. Each of the at least nine 100 Mbps Ethernet interfaces is connected to a service unit through the high-speed signal connector.

[0007] Furthermore, it also includes panel connectors;

[0008] The switching chip is connected to the panel connector and is used to provide at least two 200 Mbps Ethernet interfaces. The at least two 200 Mbps Ethernet interfaces are supplied with DC 24V power through a power connector.

[0009] Furthermore, the MCU unit includes an ARM controller, a CAN transceiver, and an RS485 converter;

[0010] The ARM controller is used to expand at least two baseboard CAN buses by connecting the CAN transceiver to its own CAN interface; and to expand at least two baseboard RS485 buses by connecting the RS485 converter to its own at least two serial ports.

[0011] Furthermore, it also includes a power supply circuit, which includes a power conversion circuit, an overcurrent and overvoltage protection circuit, and a voltage and current detection circuit;

[0012] The power conversion circuit includes a 12V to 3.3V DC / DC power chip and a 12V to 3.3V to 1.08V LDO power chip; wherein the LDO power chip is used to provide operating power for the switching chip, and the DC / DC power chip is used to provide operating power for other chips inside the plug-in besides the switching chip.

[0013] The voltage and current detection circuit includes three voltage detection sub-circuits for detecting 12V, 3.3V and 1.08V voltages and one current detection sub-circuit for detecting input current.

[0014] Furthermore, the power supply circuit also includes a power monitoring circuit;

[0015] The power monitoring circuit includes a power monitoring chip, a first reset chip, and a second reset chip. The power monitoring chip is connected to the first reset chip, the second reset chip, the DC / DC power chip, and the LDO power chip. It is used to detect the output of the power chips, reset the ARM controller through the first reset chip, and reset the switching chip and the PHY chip through the second reset chip.

[0016] Furthermore, the MCU unit includes a 16-channel GPIO expander;

[0017] The 16-channel GPIO expander connects to the I2C interface of the ARM controller and provides status indicator pins. One pin is connected to an indicator light to indicate the plug-in power supply status, another pin is connected to an indicator light to indicate the MCU unit's operating status, another pin is connected to an indicator light to indicate the communication status with the main control unit, another pin is connected to an indicator light to indicate the communication status with the baseboard bus, and the remaining 12 pins are each connected to an indicator light to indicate the connection status of the corresponding network interface.

[0018] Furthermore, the MCU unit includes a temperature sensor;

[0019] The temperature sensor is connected to the I2C interface of the ARM controller and is used to detect the temperature of the entire plug-in.

[0020] Furthermore, the MCU unit includes a memory;

[0021] The memory is connected to the I2C interface of the ARM controller and is used to store relevant information about the plug-in.

[0022] Furthermore, it also includes a first TVS device, a second TVS device, and a network transformer;

[0023] One of the gigabit Ethernet interfaces is connected to the power connector via a first TVS device and a network transformer.

[0024] Each of the at least nine 100 Mbps Ethernet interfaces is connected to a high-speed signal connector via a second TVS device and a network transformer.

[0025] Furthermore, the switching chip is an IP1819 chip.

[0026] The beneficial effects of this invention are:

[0027] The vehicle-mounted Ethernet communication plug-in provided by this invention provides a high-speed Ethernet star connection between the main control unit and each service unit. External devices transmit data to the plug-in through each service unit, and the plug-in transmits the data to the main control unit through the network, thereby realizing data transmission and exchange between the units. Attached Figure Description

[0028] Figure 1 This is one of the structural block diagrams of an in-vehicle Ethernet communication plug-in provided in an embodiment of the present invention;

[0029] Figure 2 This is a second structural block diagram of an in-vehicle Ethernet communication plug-in provided in an embodiment of the present invention;

[0030] Figure 3 A topology diagram of a power supply circuit provided in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram illustrating the connection between the switching chip and other chips or devices provided in an embodiment of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0033] Example 1

[0034] like Figure 1 As shown, this embodiment of the invention provides an in-vehicle Ethernet communication plug-in, including an MCU unit, a switching chip, a PHY chip, a high-speed signal connector, a power connector, and a panel connector;

[0035] The MCU unit is used to configure and manage the switching chip. The switching chip, connected to the PHY chip, high-speed signal connector, power connector, and panel connector, provides at least two gigabit Ethernet interfaces, at least nine first-hundred-megabit Ethernet interfaces, and at least two second-hundred-megabit Ethernet interfaces. One gigabit Ethernet interface provides standard PoE power (DC48V) to the outside via the power connector, and the other gigabit Ethernet interface is connected to the vehicle main control unit via the high-speed signal connector. Each of the at least nine first-hundred-megabit Ethernet interfaces is connected to a service unit via the high-speed signal connector. The at least two second-hundred-megabit Ethernet interfaces provide DC24V power to the outside via the power connector.

[0036] Specifically, in this embodiment, the gigabit Ethernet interface that communicates with the vehicle main control unit is the uplink channel, and other network interfaces are the downlink channels; the gigabit Ethernet interface that provides standard POE power supply of DC48V can be used to connect the dump device of the third-generation EOAS system; at least two second-hundred-megabit Ethernet interfaces that provide DC24V power supply can be used to connect the dump device of the second-generation EOAS system and the LSP / GDK system display screen, respectively.

[0037] The MCU unit includes an ARM controller, a CAN transceiver, and an RS485 converter; the ARM controller is used to connect the CAN transceiver to its own CAN interface to expand at least two baseboard CAN buses; and to connect the RS485 converter to its own at least two serial ports to expand at least two baseboard RS485 buses.

[0038] The main function of the vehicle Ethernet communication plug-in in this embodiment is to extend the network in a star topology, manage the RS485 bus and CAN bus in a unified manner, map information to corresponding ports, and transmit it to the vehicle main control unit via Ethernet.

[0039] Example 2

[0040] Based on the above embodiment 1, as follows Figure 2As shown, this embodiment of the invention also provides an in-vehicle Ethernet communication plug-in. The ARM controller uses an STM32F407VE chip, the switching chip uses an IP1819 chip, the PHY chip uses an AR8031 chip, the CAN transceiver uses an SN65HVD230D chip, the RS485 converter uses an ISL83485 chip, the panel connector uses a DB9 connector, the power connector uses a TE 5646956, and both high-speed signal connectors use a TE 6469028.

[0041] Among them, the P1~P9 ports of the IP1819 chip are connected to the high-speed signal connector in the form of 100M Ethernet for service unit expansion; the P15 and P16 ports are respectively led to two DB9 connectors; the MAC17 and MAC18 ports are connected to the two AR8031 chips through the RGMII interface to realize gigabit network communication. Among them, the MAC17+AR8031 chip realizes the uplink channel, the MAC18+AR8031 chip realizes the gigabit Ethernet external interface, and adds PoE power supply to meet the external expansion requirements of the system. The MAC 19 port is connected to the R / W interface (pins CPU_CLK:151, CPU_I / O:153, CPU_O:154, N_SS:152), the Serial LED status interface (LED_CLK:4, LED_DAT:5) and the MDC (146) / MDIO (145) interface of the ARM controller to read and write the internal registers of each component of the IP1819 chip, thereby managing the switching chip.

[0042] The AR8031 supports two modes: RGMII and SGMII, controlled by the Mode pin. This embodiment uses RGMII mode. The high two bits of the PHY chip address are 00, and the low bits are set via RXD0, RXD1, and LED_ACT.

[0043] The ARM controller connects to two SN65HVD230D chips via its own CAN interface to expand the baseboard CAN bus to two channels for communication with other service units in the system. Simultaneously, it utilizes two serial ports to connect to two ISL83485 chips to expand the baseboard RS485 bus to two channels for communication with other service units in the system. The ARM controller acts as the RS485 bus manager, periodically polling each service unit to obtain its basic information.

[0044] Furthermore, this embodiment also includes a protection design for the relevant network interfaces, specifically including: one gigabit Ethernet interface is connected to the power connector in sequence through a first TVS device and a network transformer; each of the at least nine first 100 Mbps Ethernet interfaces is connected to the high-speed signal connector in sequence through a second TVS device and a network transformer.

[0045] Specifically, after the network transformer is isolated, each differential pair is protected by adding a TVS device to the protective ground from the center tap of the transformer. Among them, the pair with PoE power supply (i.e., the first TVS device connected to the Gigabit Ethernet interface) uses SMBJ58CA, and the other pairs (i.e., the second TVS device connected to each 100 Mbps Ethernet interface) use SMAJ5.0CA.

[0046] Example 3

[0047] Based on the above embodiments, this invention also provides an in-vehicle Ethernet communication plug-in, which further includes a power supply circuit; as shown Figure 3 As shown, the power supply circuit includes a power conversion circuit, an overcurrent and overvoltage protection circuit, a voltage and current detection circuit, and a power monitoring circuit.

[0048] In this embodiment, the power conversion circuit includes a 12V to 3.3V DC / DC power chip and a 12V to 3.3V to 1.08V LDO power chip; wherein, the LDO power chip is used to provide operating power for the switching chip, and the DC / DC power chip is used to provide operating power for other chips inside the plug-in besides the switching chip; the voltage and current detection circuit includes three voltage detection sub-circuits for detecting 12V, 3.3V and 1.08V voltages and one current detection sub-circuit for detecting input current.

[0049] Specifically, the DC / DC power supply chip uses the SY8104IADC chip, and the LDO power supply chip uses the TPS7A7001 chip. The power connector on the baseboard inputs the main DC12V and backup DC12V power supplies. The two power inputs, the +12V main power supply and the +12V backup power supply, are each connected in series with a diode and combined into one power supply for the plug-in module.

[0050] In this embodiment, a 1.5A / 24V resettable fuse, model SMD1812B150TF / 24, is used for current protection. It should be noted that the fuse selection is based on... Figure 3 The maximum power consumption of the main components in the power supply topology shown is determined. 3.3V@3A and 1.08V@2A, with a conversion efficiency of approximately 90%, and a maximum current of 1.1A at 12V.

[0051] In this embodiment, the built-in AD converter of the ARM controller is used to acquire the voltage and current signals of the entire plug-in, with the REF3030 as the reference voltage source. The 12V and 3.3V voltage signals are acquired by directly dividing the voltage to 2V using precision resistors, while the 1.08V voltage signal is acquired by directly outputting it to the ADC pin of the ARM controller through the operational amplifier circuit. The current signal is acquired using a current sensing resistor, with the input current connected in series with a 0.02Ω sampling resistor in a 2512 package (1W), and then output to the ADC pin of the ARM controller through the operational amplifier circuit.

[0052] In this embodiment, the power monitoring circuit includes a power monitoring chip, a first reset chip, and a second reset chip. The power monitoring chip is connected to the first reset chip, the second reset chip, the DC / DC power chip, and the LDO power chip. It is used to detect the output of the power chips, reset the ARM controller through the first reset chip, and reset the switching chip and the PHY chip through the second reset chip.

[0053] Specifically, the power monitoring chip uses the TPS3802K33 chip, the first reset chip uses the CAT811R chip, and the second reset chip uses the CAT811T chip. The TPS3802K33 power monitoring chip detects the +3.3V power supply of the entire board, controls the enable pin of the 1.08V power conversion chip, and pulls the enable signal high after a 380ms delay, simultaneously resetting the ARM chip. After the ARM starts working, it outputs an enable signal to reset the switching chip and PHY chip. When the system powers on, the TPS3802K33 chip generates a system reset trigger signal and outputs it to control the CAT811R and CAT811T chips. The reset signal from the CAT811R chip is output to the ARM controller chip, and the reset signal from the CAT811T chip is output to the IP1819 and AR8031 chips. Simultaneously, the ARM controller can also output a reset control signal via GPIO, enabling the MR pin of the CAT811T chip to control the reset of the IP1819 and AR8031 chips.

[0054] Example 4

[0055] Based on the above embodiments, this invention also provides an in-vehicle Ethernet communication plug-in, wherein the MCU unit in the plug-in further includes a 16-channel GPIO expander, a temperature sensor, and a memory;

[0056] Combination Figure 2As shown, the 16-channel GPIO expander connects to the I2C interface of the ARM controller to provide status indicator pins. In this embodiment, a current-sinking design is used; the indicator light illuminates when the pin is low and turns off when the pin is high. One pin connects to an indicator light to indicate the plug-in power supply status, one pin connects to an indicator light to indicate the MCU unit's operating status, one pin connects to an indicator light to indicate the communication status with the main control unit, one pin connects to an indicator light to indicate the communication status with the baseboard bus, and the remaining 12 pins each connect to an indicator light to indicate the connection status of their respective network interfaces. In this embodiment, the GPIO expander uses the PCA9539 chip.

[0057] Combination Figure 2 As shown, the temperature sensor uses a TMP75 chip and is connected to the I2C interface of the ARM controller to detect the temperature of the entire plug-in.

[0058] Combination Figure 2 As shown, the memory uses a 24C02 memory and is connected to the I2C interface of the ARM controller. It is used to store relevant information of the plug-in, including system name, hardware version, device number, manufacturing date and other identifiers, to meet the requirements of intelligent maintainability of factory information.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle-mounted Ethernet communication plug-in, characterized in that, include: The system includes an MCU unit, a switching chip, a PHY chip, a high-speed signal connector, a power connector, a first TVS device, a second TVS device, and a network transformer; the switching chip is an IP1819 chip; the high-speed signal connector is a TE 6469028. The MCU unit is used to configure and manage the switching chip. The MCU unit includes an ARM controller, a CAN transceiver, an RS485 converter, a 16-channel GPIO expander, a temperature sensor, and a memory. The ARM controller is used to connect to the CAN transceiver via its own CAN interface to expand at least two baseboard CAN buses; and to connect to the RS485 converter via its own at least two serial ports to expand at least two baseboard RS485 buses. The 16-channel GPIO expander is connected to the I2C interface of the ARM controller and is used to provide status indicator pins. One pin is connected to an indicator light to indicate the plug-in power supply status, one pin is connected to an indicator light to indicate the MCU unit's operating status, one pin is connected to an indicator light to indicate the communication status with the main control unit, one pin is connected to an indicator light to indicate the communication status with the baseboard bus, and the remaining 12 pins are each connected to an indicator light to indicate the connection status of the corresponding network interface. The temperature sensor is connected to the I2C interface of the ARM controller and is used to detect the temperature of the entire plug-in. The memory is connected to the I2C interface of the ARM controller and is used to store relevant information about the plug-in. The switching chip is connected to the PHY chip, the high-speed signal connector and the power connector, and is used to provide at least two gigabit Ethernet interfaces and at least nine 100 Mbps Ethernet interfaces. One gigabit Ethernet interface is connected to a power connector via a first TVS device and a network transformer, providing standard DC48V PoE power to the outside. The other gigabit Ethernet interface is connected to the vehicle main control unit via the high-speed signal connector. Each of the at least nine first 100 Mbps Ethernet interfaces is connected to a high-speed signal connector via a second TVS device and a network transformer, and each high-speed signal connector is connected to a service unit. The gigabit Ethernet interface communicating with the vehicle main control unit is the uplink channel, and the other network interfaces are the downlink channels. The in-vehicle Ethernet communication plug-in provides a high-speed Ethernet star connection between the main control unit and each service unit. External devices transmit data to the plug-in through each service unit, and the plug-in then transmits the data to the main control unit via the network, realizing data transmission and exchange between the units. The main function of the in-vehicle Ethernet communication plug-in is to extend the network in a star topology, manage the RS485 bus and CAN bus in a unified manner, map information to corresponding ports, and transmit it to the in-vehicle main control unit via Ethernet.

2. The in-vehicle Ethernet communication plug-in according to claim 1, characterized in that, It also includes panel connectors; The switching chip is connected to the panel connector and is used to provide at least two 200 Mbps Ethernet interfaces. The at least two 200 Mbps Ethernet interfaces are supplied with DC 24V power through a power connector.

3. The in-vehicle Ethernet communication plug-in according to claim 1, characterized in that, It also includes a power supply circuit, which includes a power conversion circuit, an overcurrent and overvoltage protection circuit, and a voltage and current detection circuit. The power conversion circuit includes a 12V to 3.3V DC / DC power chip and a 12V to 3.3V to 1.08V LDO power chip; wherein the LDO power chip is used to provide operating power for the switching chip, and the DC / DC power chip is used to provide operating power for other chips inside the plug-in besides the switching chip. The voltage and current detection circuit includes three voltage detection sub-circuits for detecting 12V, 3.3V and 1.08V voltages and one current detection sub-circuit for detecting input current.

4. The in-vehicle Ethernet communication plug-in according to claim 3, characterized in that, The power supply circuit also includes a power monitoring circuit. The power monitoring circuit includes a power monitoring chip, a first reset chip, and a second reset chip. The power monitoring chip is connected to the first reset chip, the second reset chip, the DC / DC power chip, and the LDO power chip. It is used to detect the output of the power chips, reset the ARM controller through the first reset chip, and reset the switching chip and the PHY chip through the second reset chip.

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