CN210578601U - Vehicle-mounted Ethernet system - Google Patents
Vehicle-mounted Ethernet system Download PDFInfo
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- CN210578601U CN210578601U CN201921603475.4U CN201921603475U CN210578601U CN 210578601 U CN210578601 U CN 210578601U CN 201921603475 U CN201921603475 U CN 201921603475U CN 210578601 U CN210578601 U CN 210578601U
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Abstract
The embodiment of the utility model discloses on-vehicle ethernet system, this system includes: an external interface circuit and a switching module; the external interface circuit is provided with an Ethernet interface suitable for at least one interface type and is used for establishing communication connection between the switching module and an external Ethernet node; and the switching module supports at least one protocol standard corresponding to the interface type and is used for communicating with an external Ethernet node through an external interface circuit. The embodiment of the utility model provides an ethernet interface based on supporting multiple interface protocol standard's single exchange module provides multiple interface type simultaneously for vehicle control unit, has realized a multiport, has integrated and configurable on-vehicle ethernet system scheme, has saved vehicle control unit's hardware cost and volume from this, provides the prerequisite for realizing the autopilot control more than L3 level simultaneously, can be applicable to future autopilot, car networking and high definition video signal transmission.
Description
Technical Field
The embodiment of the utility model provides a relate to vehicle network communication technical field, especially relate to a vehicle-mounted ethernet system.
Background
With the increasing number of Electronic Control Units (ECUs) built in a vehicle, the demand for computing power of microcontrollers in the ECUs is increasing, and the arrival of the era of high-level automatic driving, the network architecture of the vehicle is becoming more and more complex, and the demand for communication rate is also increasing, so that the overall weight, volume and cost of a wire harness need to be increased, and the demand for communication rate of the vehicle cannot be well met.
The vehicle-mounted Ethernet has the transmission rate of 100Mbps and 1Gbps, can meet the transmission requirements of most audio and video and network protocol packets, and is different from the traditional Ethernet, the hundred-million vehicle-mounted Ethernet interface is 100Base-T1, and the gigabit vehicle-mounted Ethernet interface is 1000 Base-T1. Compared with the traditional Ethernet which adopts four signal wires, the UTP transmission can reduce the weight of the cable by 30 percent and simultaneously meet the EMC requirement of an automobile. In addition, the volume and cost of the vehicle-mounted Ethernet connector also have certain advantages over the traditional Ethernet connector.
However, most of the current vehicle-mounted Ethernet systems are 1-channel 100Base-T1 interfaces, and do not have the switching and expansion capabilities between the traditional Ethernet and the vehicle-mounted Ethernet, and the transmission capability of the gigabit vehicle-mounted Ethernet, so that the current vehicle-mounted Ethernet systems are not suitable for future automatic driving, vehicle networking and high-definition video signal transmission; for the discrete chip solution, for example, a combination form of a multi-Port Physical Layer (PHY) chip or a Switch (Switch) chip plus a PHY chip is adopted, although this solution can simultaneously support 100Mbps and 1000Mbps transmission rates, in terms of hardware design, the Port configuration flexibility is not high, and the multi-chip discrete solution is not favorable for the overall cost and the Printed Circuit Board (PCB) area.
Disclosure of Invention
The embodiment of the utility model provides an on-vehicle ethernet system to based on single chip provides multichannel 100Base-T1, 1000Base-T1 on-vehicle ethernet interface and 100Base-Tx tradition ethernet interface simultaneously for vehicle control unit, realized a multiport, integrated and configurable on-vehicle ethernet system scheme.
The embodiment of the utility model provides an on-vehicle ethernet system, this system includes: an external interface circuit and a switching module;
the external interface circuit is provided with an Ethernet interface suitable for at least one interface type and is used for establishing communication connection between the switching module and an external Ethernet node;
the switching module supports at least one protocol standard corresponding to the interface type and is used for communicating with the external Ethernet node through the external interface circuit to realize the receiving of the external Ethernet data of the vehicle-mounted Ethernet system and the forwarding of the internal Ethernet data of the vehicle-mounted Ethernet system.
Optionally, the Switch module adopts a Broadcom BCM89559G multiport integrated Switch chip;
the external interface circuit includes: the system comprises a first interface with at least one path of interface type being hundred-megabyte vehicle-mounted Ethernet 100Base-T1, a second interface with at least one path of interface type being gigabit vehicle-mounted Ethernet 1000Base-T1 and a third interface with at least one path of interface type being hundred-megabyte traditional Ethernet 100 Base-Tx.
Further, a 100Base-T1 hardware channel is arranged on a third interface corresponding to the hundred mega traditional Ethernet 100Base-Tx interface type;
the 100Base-T1 hardware channel is used for configuring the third interface corresponding to the 100Base-Tx as a fourth interface matched with the first interface with the interface type of 100Base-T1 when receiving a conversion instruction of interface type conversion.
Optionally, the external ethernet node comprises: gateway controllers, sensors, and personal computers;
the gateway controller communicates with the switching module through the first interface;
the sensor communicates with the exchange module through the second interface;
and the personal computer is communicated with the exchange module through the third interface.
Optionally, the interface circuit corresponding to the first interface includes: the ESD protection circuit comprises a first vehicle-mounted Ethernet connector, a first filter circuit, a first common-mode filter inductor, a first blocking capacitor and a first electrostatic discharge (ESD) protection device.
Optionally, the interface circuit corresponding to the second interface includes: the second vehicle-mounted Ethernet connector, the second filter circuit, the second common-mode filter inductor, the second blocking capacitor and the second ESD protection device.
Further, the vehicle-mounted ethernet system further includes: the internal interface circuit and the central processing module;
the central processing module communicates with the switching module through the internal interface circuit, receives and processes the Ethernet data forwarded by the switching module, sends the Ethernet data to the outside through the switching module, and configures the working mode of the switching module.
Optionally, the pair of internal interface circuits comprises: at least one path of reduced gigabit media independent interface RGMII or serial gigabit media independent interface SGMII for establishing the communication connection between the exchange module and the central processing module;
further comprising: and the at least one path of SGMII is used for the expanded cascade of the switching modules.
Further, the vehicle-mounted ethernet system further includes: a power supply module for supplying power to the power supply module,
the power module is specifically configured to: and providing power supply voltages of three grades, namely 3.3V, 1.8V and 1.0V, for the switching module, wherein 3.3V is the input/output (IO) interface voltage of the switching module, 1.8V is the internal reference voltage of the switching module, and 1.0V is the core voltage of the switching module.
Optionally, the power module comprises: a first power supply unit and a second power supply unit;
the first power supply unit includes: the first direct current voltage reducer, the first low dropout linear regulator, the second low dropout linear regulator and the third low dropout linear regulator; the first direct current voltage reducer is used for converting externally input 12V direct current voltage into 5V direct current voltage and outputting the 5V direct current voltage to the first low dropout linear regulator, the second low dropout linear regulator and the third low dropout linear regulator respectively; the first low dropout linear regulator, the second low dropout linear regulator and the third low dropout linear regulator are used for respectively outputting 3.3V direct current voltage, 1.8V direct current voltage and 1.0V direct current voltage to the exchange module;
the second power supply unit includes: the second direct current voltage reducer is used for converting externally input 12V direct current voltage into 5V direct current voltage and outputting the 5V direct current voltage to the fourth low dropout linear regulator; the fourth low dropout regulator is used for outputting 3.3V direct current voltage to the first control circuit and the second control circuit; the first control circuit is used for converting the 3.3V direct-current voltage into a 1.8V direct-current voltage and outputting the voltage to the switching module when receiving a first control signal of the switching module; and the second control circuit is used for converting the 3.3V direct-current voltage into a 1.0V direct-current voltage and outputting the voltage to the switching module when receiving a second control signal of the switching module.
The embodiment of the utility model provides an ethernet interface based on supporting multiple interface protocol standard's single exchange module provides multiple interface type simultaneously for vehicle control unit, has realized a multiport, has integrated and configurable on-vehicle ethernet system scheme, has saved vehicle control unit's hardware cost and volume from this, provides the prerequisite for realizing the autopilot control more than L3 level simultaneously, can be applicable to future autopilot, car networking and high definition video signal transmission.
Drawings
Fig. 1 is a schematic structural diagram of a vehicle-mounted ethernet system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a vehicle-mounted ethernet system according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a first interface corresponding circuit according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a second interface corresponding circuit according to a second embodiment of the present invention;
fig. 5 is a schematic diagram of a scheme that a third interface is configured as a fourth interface according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of a first power supply unit according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a second power supply unit according to a second embodiment of the present invention;
fig. 8 is a diagram illustrating a structure example of a vehicle-mounted ethernet system according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. Furthermore, the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic structural diagram of a vehicle-mounted ethernet system according to an embodiment of the present invention, which can provide ethernet interfaces of multiple interface types for a vehicle control unit based on a single switch module supporting multiple interface protocol standards, thereby implementing a multi-port, integrated and configurable vehicle-mounted ethernet system scheme. As shown in fig. 1, the system specifically includes: an external interface circuit 101 and a switching module 102;
the external interface circuit 101 is provided with an ethernet interface suitable for at least one interface type and is used for establishing communication connection between the switching module 102 and an external ethernet node;
the switching module 102 supports at least one protocol standard corresponding to an interface type, and is configured to communicate with the external ethernet node through the external interface circuit 101, so as to implement receiving of external ethernet data in the vehicle-mounted ethernet system and forwarding of ethernet data in the vehicle-mounted ethernet system.
The external interface circuit 101 is an interface circuit for connecting the switching module 102 and an external ethernet node, so that the switching module 102 communicates with the external ethernet node; the external interface circuit 101 includes at least one interface type of ethernet interface.
Optionally, the interface types include: a hundred mega vehicle-mounted Ethernet 100Base-T1 interface, a gigabit vehicle-mounted Ethernet 1000Base-T1 interface and a hundred mega traditional Ethernet 100Base-Tx interface. The 100Base-T1 meets the IEEE802.3bw standard, the 1000Base-T1 meets the IEEE802.3bp standard, and the 100Base-Tx meets the IEEE802.3u standard.
The switching module 102 is a module for implementing a network switching function in the vehicle-mounted ethernet system, and optionally, the switching module 102 employs a multi-port integrated switching chip supporting a protocol standard corresponding to an interface type included in the external interface circuit 101.
The external Ethernet node can be understood as an Ethernet node outside the vehicle-mounted Ethernet system; optionally, the external ethernet node comprises: a gateway controller that may communicate with the switching module 102 via the 100Base-T1 interface, a sensor that may communicate with the switching module 102 via the 1000Base-T1 interface, and a personal computer that may communicate with the switching module 102 via the 100Base-Tx interface.
The embodiment of the utility model provides an ethernet interface based on supporting multiple interface protocol standard's single exchange module provides multiple interface type simultaneously for vehicle control unit, has realized a multiport, has integrated and configurable on-vehicle ethernet system scheme, has saved vehicle control unit's hardware cost and volume from this, provides the prerequisite for realizing the autopilot control more than L3 level simultaneously, can be applicable to future autopilot, car networking and high definition video signal transmission.
Further, as an optional embodiment of the first embodiment, the first embodiment further preferably includes: the internal interface circuit and the central processing module;
the central processing module communicates with the switching module 102 through the internal interface circuit, receives and processes ethernet data forwarded by the switching module 102, sends the ethernet data to the outside through the switching module 102, and configures a working mode of the switching module 102.
The internal interface circuit is an interface circuit in the vehicle-mounted ethernet system for connecting the switching module 102 and the central processing module. Optionally, the pair of internal interface circuits comprises: at least one path of reduced gigabit media independent interface RGMII or serial gigabit media independent interface SGMII for establishing communication connection between the switching module 102 and the central processing module; further comprising: and at least one path of SGMII is used for the extended cascade of the switching module 102.
Optionally, the pair of internal interface circuits further comprises: a Serial Peripheral Interface (SPI) and a Management Data Input/Output (MDIO) interface, and the central processing module configures the SPI and the MDIO interface to configure different interface circuits in the switch module 102, so that the switch module 102 enters different working modes, and the working modes can be used to indicate types and numbers of currently selected interface circuits.
The central processing module is used for processing Ethernet data in the vehicle-mounted Ethernet system and controlling other modules in the vehicle-mounted Ethernet system.
Alternatively, the central processing module may be a Central Processing Unit (CPU) internally integrated in the switch module 102, or may be a CPU independently externally disposed outside the switch module 102.
In this alternative embodiment, on the basis of the above embodiment, by adding the internal interface circuit and the central processing module, the central processing module may configure different operating modes of the switch module 102 through the internal interface circuit, and implement the expanded cascade connection of the switch module 102, so that when the number of required interfaces is large and a single switch module cannot meet the requirement, the number of interfaces may be expanded by cascading a plurality of switch modules.
Example two
Fig. 2 is a schematic structural diagram of a vehicle-mounted ethernet system according to an embodiment of the present invention, which is further optimized based on the first embodiment. In this embodiment, the switch module 102 and the external interface circuit 101 are embodied as follows: the Switch module 102 adopts a Broadcom BCM89559G multi-port integrated Switch chip; the external interface circuit 101 includes: the system comprises a first interface with at least one path of interface type being hundred-megabyte vehicle-mounted Ethernet 100Base-T1, a second interface with at least one path of interface type being gigabit vehicle-mounted Ethernet 1000Base-T1 and a third interface with at least one path of interface type being hundred-megabyte traditional Ethernet 100 Base-Tx.
This embodiment has still optimized the power module that has increased, the power module specifically is used for: and providing power supply voltages of three grades, namely 3.3V, 1.8V and 1.0V, for the switching module, wherein 3.3V is the input/output (IO) interface voltage of the switching module, 1.8V is the internal reference voltage of the switching module, and 1.0V is the core voltage of the switching module.
As shown in fig. 2, the vehicle-mounted ethernet system provided in this embodiment includes: an external interface circuit 201, a switching module 202, an internal interface circuit 203, a central processing module 204, and a power supply module 205.
Optionally, the interface circuit corresponding to the first interface in the external interface circuit 201 includes: the ESD protection circuit comprises a first vehicle-mounted Ethernet connector, a first filter circuit, a first common-mode filter inductor, a first blocking capacitor and a first electrostatic discharge (ESD) protection device.
Optionally, the interface circuit corresponding to the second interface in the external interface circuit 201 includes: the second vehicle-mounted Ethernet connector, the second filter circuit, the second common-mode filter inductor, the second blocking capacitor and the second ESD protection device.
For example, a schematic structural diagram of a corresponding circuit of the first interface is shown in fig. 3, where the first in-vehicle ethernet connector conforms to IEEE standard, meets 100 ohm impedance matching, and is used for connecting with a corresponding external ethernet node; the first filtering circuit is connected with the first vehicle-mounted Ethernet connector and is used for filtering low-frequency interference signals in a circuit corresponding to the first interface; the first common-mode filter inductor is connected with the first filter circuit and used for filtering common-mode electromagnetic interference signals in a circuit corresponding to the first interface and inhibiting high-speed signals from radiating electromagnetic waves to the outside of the circuit; the first blocking capacitor is used for filtering out direct-current interference signals in a circuit corresponding to the first interface; the first ESD protection device is configured to perform electrostatic protection on a port of the switch module 202 connected to the circuit corresponding to the first interface.
The structure schematic diagram of the circuit corresponding to the second interface is shown in fig. 4, the circuit corresponding to the second interface is mainly used for providing a 1000Base-T1 interface to realize gigabit vehicle-mounted ethernet transmission, the structure of the interface circuit corresponding to the second interface is the same as that of the interface circuit corresponding to the first interface, and each corresponding component has the same function.
Optionally, a 100Base-T1 hardware channel is provided in the circuit corresponding to the third interface in the external interface circuit 201; the 100Base-T1 hardware channel is used for configuring the third interface corresponding to the 100Base-Tx as a fourth interface matched with the first interface with the interface type of 100Base-T1 when receiving a conversion instruction of interface type conversion.
It can be understood that by setting the 100Base-T1 hardware channel, when the requirement of the 100Base-T1 interface is large and the 100Base-Tx interface is not needed to work temporarily, the 100Base-Tx interface can be configured into a 100Base-T1 interface to meet the actual requirement.
For example, a schematic diagram of a scheme configured by the third interface as the fourth interface is shown in fig. 5. In the aspect of a hardware circuit, R3 and R4 resistors are pasted, R1 and R2 resistors are removed, and a 100Base-T1 hardware channel is opened; the central processing module then configures the register of the switch module 202 through the SPI to change the Port corresponding to 100Base-Tx into the 100Base-T1 transmission mode. Similarly, 100Base-Tx hardware channels can be opened again by mounting R1 and R2 resistors and removing R3 and R4 resistors; the 100Base-Tx transmission mode may then be re-entered by the central processing module through the registers of the SPI configuration switch module 202. The 100Base-Tx interface circuit adopts two pairs of twisted pairs, and has four paths of signals, which are respectively connected to four Port ports Tx0_ N, Tx0_ P, Tx1_ N, Tx1_ P of the switching module 202; the 100Base-T1 interface circuit adopts a single twisted pair wire to share two signals, so the selected Port Tx0_ N, Tx0_ P is used as two ports with multiplexed functions.
Optionally, the power module comprises: a first power supply unit and a second power supply unit;
wherein the first power supply unit includes: the first direct current voltage reducer, the first low dropout linear regulator, the second low dropout linear regulator and the third low dropout linear regulator;
the first direct current voltage reducer is used for converting externally input 12V direct current voltage into 5V direct current voltage and outputting the 5V direct current voltage to the first low dropout linear regulator, the second low dropout linear regulator and the third low dropout linear regulator respectively; the first low dropout linear regulator, the second low dropout linear regulator and the third low dropout linear regulator are used for respectively outputting 3.3V direct current voltage, 1.8V direct current voltage and 1.0V direct current voltage to the exchange module;
the second power supply unit includes: the second direct current voltage reducer is used for converting externally input 12V direct current voltage into 5V direct current voltage and outputting the 5V direct current voltage to the fourth low dropout linear regulator; the fourth low dropout regulator is used for outputting 3.3V direct current voltage to the first control circuit and the second control circuit; the first control circuit is used for converting the 3.3V direct-current voltage into a 1.8V direct-current voltage and outputting the voltage to the switching module when receiving a first control signal of the switching module; and the second control circuit is used for converting the 3.3V direct-current voltage into a 1.0V direct-current voltage and outputting the voltage to the switching module when receiving a second control signal of the switching module.
Optionally, when the external ethernet communication load is high and the high-speed communication is performed, the first power supply unit may be selected to supply power in consideration of the large chip thermal power consumption. For example, a schematic structural diagram of the first power supply unit is shown in fig. 6.
Alternatively, when the external load is small and the communication rate is low, the second power supply unit may be selected to supply power in consideration of the overall hardware cost. For example, a schematic structural diagram of the second power supply unit is shown in fig. 7.
It should be noted that the first power supply unit and the second power supply unit are used as two optional power supply schemes, printed circuits corresponding to the two schemes are reserved on a PCB in the previous circuit design, and corresponding hardware devices are all set in a detachable form, so that the corresponding devices can be mounted immediately after the actually required power supply scheme is determined according to actual conditions.
For example, fig. 8 shows an exemplary structure diagram of a vehicle-mounted ethernet system, and as shown in fig. 8, the vehicle-mounted ethernet system provides 4 paths of 100Base-T1 interfaces, 1 path of 1000Base-T1 interfaces, and 1 path of 100Base-Tx/100Base-T1 interfaces to the outside, provides 2 paths of RGMII/SGMII interfaces to the inside, one path is used for communicating with a CPU, the other path may be used for Switch SGMII interface cascade to extend a vehicle-mounted ethernet interface, and may support at most 9 paths of 100Base-T1, 2 paths of 1000Base-T1, and 1 path of 100Base-Tx through two pieces of Switch cascade. The 100Base-T1 interface is connected with a Gateway controller, the 1000Base-T1 interface is connected with a sensor Senor, such as a laser radar sensor, a high-definition Camera sensor and the like, and the 100Base-Tx interface is connected with a PC computer, so that the whole scheme meets the requirements of large-bandwidth and high-rate network signal transmission of an L3-level automatic driving controller.
In addition, the CPU is provided with an RGMII or SGMII Ethernet interface, supports the maximum rate transmission of 1000Mbps of the whole vehicle controller, simultaneously supports SPI and MDIO interfaces, and enters different working modes by configuring a Switch chip through the SPI and the MDIO interfaces.
The embodiment of the utility model provides a can provide multichannel 100Base-T1 interface, 1000Base-T1 interface and 100Base-Tx interface simultaneously for vehicle control unit based on single exchange module, realized a multiport, integrated and configurable on-vehicle ethernet system scheme, saved vehicle control unit's hardware cost and volume from this, provide the prerequisite for realizing the autopilot control more than L3 level simultaneously, can be applicable to future autopilot, the car networking and high definition video signal transmission.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. An in-vehicle ethernet system, comprising: an external interface circuit and a switching module;
the external interface circuit is provided with an Ethernet interface suitable for at least one interface type and is used for establishing communication connection between the switching module and an external Ethernet node;
the switching module supports at least one protocol standard corresponding to the interface type and is used for communicating with the external Ethernet node through the external interface circuit to realize the receiving of the external Ethernet data of the vehicle-mounted Ethernet system and the forwarding of the internal Ethernet data of the vehicle-mounted Ethernet system.
2. The system of claim 1,
the switching module adopts a Broadcom BCM89559G multi-port integrated switching Switch chip;
the external interface circuit includes: the system comprises a first interface with at least one path of interface type being hundred-megabyte vehicle-mounted Ethernet 100Base-T1, a second interface with at least one path of interface type being gigabit vehicle-mounted Ethernet 1000Base-T1 and a third interface with at least one path of interface type being hundred-megabyte traditional Ethernet 100 Base-Tx.
3. The system according to claim 2, characterized in that a 100Base-T1 hardware channel is provided for the third interface with the interface type of hundred megabyte legacy ethernet 100 Base-Tx;
the 100Base-T1 hardware channel is used for configuring the third interface corresponding to the 100Base-Tx as a fourth interface matched with the first interface with the interface type of 100Base-T1 when receiving a conversion instruction of interface type conversion.
4. The system of claim 2, wherein the external ethernet node comprises: gateway controllers, sensors, and personal computers;
the gateway controller communicates with the switching module through the first interface;
the sensor communicates with the exchange module through the second interface;
and the personal computer is communicated with the exchange module through the third interface.
5. The vehicle-mounted Ethernet system according to claim 2, wherein the interface circuit corresponding to the first interface comprises: the ESD protection circuit comprises a first vehicle-mounted Ethernet connector, a first filter circuit, a first common-mode filter inductor, a first blocking capacitor and a first electrostatic discharge (ESD) protection device.
6. The vehicle-mounted Ethernet system according to claim 2, wherein the interface circuit corresponding to the second interface comprises: the second vehicle-mounted Ethernet connector, the second filter circuit, the second common-mode filter inductor, the second blocking capacitor and the second ESD protection device.
7. The system of any one of claims 1-6, further comprising: the internal interface circuit and the central processing module;
the central processing module communicates with the switching module through the internal interface circuit, receives and processes the Ethernet data forwarded by the switching module, sends the Ethernet data to the outside through the switching module, and configures the working mode of the switching module.
8. The system of claim 7, wherein the intra-pair interface circuit comprises: at least one path of reduced gigabit media independent interface RGMII or serial gigabit media independent interface SGMII for establishing the communication connection between the exchange module and the central processing module;
further comprising: and the at least one path of SGMII is used for the expanded cascade of the switching modules.
9. The system of any one of claims 1-6, further comprising: a power supply module for supplying power to the power supply module,
the power module is specifically configured to: and providing power supply voltages of three grades, namely 3.3V, 1.8V and 1.0V, for the switching module, wherein 3.3V is the input/output (IO) interface voltage of the switching module, 1.8V is the internal reference voltage of the switching module, and 1.0V is the core voltage of the switching module.
10. The system of claim 9, wherein the power module comprises: a first power supply unit and a second power supply unit;
the first power supply unit includes: the first direct current voltage reducer, the first low dropout linear regulator, the second low dropout linear regulator and the third low dropout linear regulator; the first direct current voltage reducer is used for converting externally input 12V direct current voltage into 5V direct current voltage and outputting the 5V direct current voltage to the first low dropout linear regulator, the second low dropout linear regulator and the third low dropout linear regulator respectively; the first low dropout linear regulator, the second low dropout linear regulator and the third low dropout linear regulator are used for respectively outputting 3.3V direct current voltage, 1.8V direct current voltage and 1.0V direct current voltage to the exchange module;
the second power supply unit includes: the second direct current voltage reducer is used for converting externally input 12V direct current voltage into 5V direct current voltage and outputting the 5V direct current voltage to the fourth low dropout linear regulator; the fourth low dropout regulator is used for outputting 3.3V direct current voltage to the first control circuit and the second control circuit; the first control circuit is used for converting the 3.3V direct-current voltage into a 1.8V direct-current voltage and outputting the voltage to the switching module when receiving a first control signal of the switching module; and the second control circuit is used for converting the 3.3V direct-current voltage into a 1.0V direct-current voltage and outputting the voltage to the switching module when receiving a second control signal of the switching module.
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| CN201921603475.4U CN210578601U (en) | 2019-09-24 | 2019-09-24 | Vehicle-mounted Ethernet system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111757190A (en) * | 2020-06-09 | 2020-10-09 | 苏州科可瑞尔航空技术有限公司 | High-reliability unified switch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111757190A (en) * | 2020-06-09 | 2020-10-09 | 苏州科可瑞尔航空技术有限公司 | High-reliability unified switch |
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