CN109561031A - A kind of vehicle-mounted Layer 2 switch of high reliability - Google Patents
A kind of vehicle-mounted Layer 2 switch of high reliability Download PDFInfo
- Publication number
- CN109561031A CN109561031A CN201811186723.XA CN201811186723A CN109561031A CN 109561031 A CN109561031 A CN 109561031A CN 201811186723 A CN201811186723 A CN 201811186723A CN 109561031 A CN109561031 A CN 109561031A
- Authority
- CN
- China
- Prior art keywords
- ethernet
- switch
- connector
- power supply
- chip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/10—Packet switching elements characterised by the switching fabric construction
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
Abstract
The present invention is a kind of vehicle-mounted Layer 2 switch of high reliability, including power module, ethernet signal processing module, front panel and embedded submodule, the power module is by sequentially connected airborne DC power supply, protection circuit, filter circuit and DC-DC reduction voltage circuit are constituted, the ethernet signal processing module includes controller CPU, the controller CPU connects Ethernet Switch chip by RvMII interface, the output end output of the Ethernet Switch chip has multichannel 100 m ethernet and is connected to connector, Ethernet Switch chip connects ethernet PHY chip by SGMII interface, the output end output of the ethernet PHY chip has multichannel gigabit Ethernet and is connected to connector.Switch system safety and stability of the invention is high, Ethernet can be allowed to work reliable and securely in harsh environment, and interchanger is not influenced by equipment itself current state, is avoided because network switches the difficulty of bring time delays and network O&M management by hand.
Description
Technical field
The present invention relates to the vehicle in rail traffic and aviation/airborne communication technique fields, and in particular to a kind of high reliability
Vehicle-mounted Layer 2 switch.
Background technique
The prior art: having a mature Layer 2 switch on the market at present, and this common Layer 2 switch has Duo Kou, more
Functions such as agreement and setting is simple, have in business and industry and are widely applied.
Problem disadvantage: in vehicle-mounted industry, there are higher requirement, conventional Layer 2 switch for stability, safety
It is not achieved related request, when conventional Layer 2 switch networking has an interchanger this network that breaks down just to will appear paralysis.
Summary of the invention
The object of the present invention is to overcome the problems of the prior art, provides a kind of vehicle-mounted Layer2 switching of high reliability
Machine.
To realize above-mentioned technical purpose and the technique effect, the invention is realized by the following technical scheme:
A kind of vehicle-mounted Layer 2 switch of high reliability, the interchanger include power module, ethernet signal processing module, front panel
With embedded submodule, wherein
The power module is by sequentially connected airborne DC power supply, protection circuit, filter circuit and DC-DC reduction voltage circuit structure
At being respectively used to anti-interference that is short-circuit, anti-reverse, eliminating spike and surge, that the common-mode signal of eliminating on power supply lowers electromagnetism is dry
It disturbs and provides the power supply of different voltages for the chip in interchanger；
The ethernet signal processing module includes controller CPU, and the controller CPU connects Ethernet by RvMII interface
The output end output of Switch chip, the Ethernet Switch chip has multichannel 100 m ethernet and is connected to connector, with
Too net Switch chip connects ethernet PHY chip by SGMII interface, and the output end output of the ethernet PHY chip has
Multichannel gigabit Ethernet is simultaneously connected to connector；
The front panel is equipped with several external interfaces and internal connector, and front panel passes through internal connector and ethernet signal
Connector in processing module is correspondingly connected with, and is used for transmission multichannel 100 m ethernet and multichannel gigabit ethernet signal；
The embedded submodule is by microprocessor CPU and memory DDR, the memory of the connection microprocessor CPU
Flash and crystal oscillator XTAL composition, wherein microprocessor CPU is for carrying out processing operation, and memory DDR is for keeping in microprocessor
The operational data of CPU, memory Flash is for storing corresponding operation operating system, to ensure that software systems stability and high efficiency is transported
Row, high efficient and reliable operational network data.
Further, the protection circuit is made of fuse, Transient Suppression Diode TVS and counnter attack diode, described
Fuse and Transient Suppression Diode are sequentially connected in series on the positive output channel of airborne DC power supply, be respectively used to it is anti-short circuit and
Anti-reverse, one end of the Transient Suppression Diode TVS is connected on the negative output channel of airborne DC power supply, and transient state inhibits
The other end of diode TVS and the public series side of fuse and Transient Suppression Diode link together, for eliminating spike
With surge, spike and surge jamming equipment on access are prevented.
Further, the filter circuit is made of common mode inductance, special filter, capacitor and inductance, by an inductance
Composition π filter is connect with two capacitor annulars, the common mode inductance, special filter and π filter are sequentially connected in series, for disappearing
Except the common-mode signal on airborne DC power supply, the noise on airborne DC power supply is filtered out, and lowers electromagnetic interference EMI, improves electricity
Magnetic compatibility EMC.
Further, the airborne DC power supply provides 24V voltage, and the DC-DC reduction voltage circuit is by seven power supply chips
The 24V voltage inputted by protection circuit and filter circuit is converted into 12V, 3.3V, 1.8V, 1.2V and 1.1V respectively by composition,
For to different chip power supply each in interchanger.
Further, the output end output of the Ethernet Switch chip has 13 road 100 m ethernets, the Ethernet
The output end output of PHY chip has 4 road gigabit Ethernets.
Further, the internal connector on the front panel includes 8 100 m ethernet out connector M12 and 4
Gigabit Ethernet out connector M12.
Further, the gigabit Ethernet access between the output end and connector of the ethernet PHY chip is equipped with
Bypass system, the Bypass system include relay, the end LAN1 PHY, the end LAN1 and the end LAN2, and the 1st of the relay the
Contact connects the end LAN2, and the 2nd contact of relay connects the end LAN1 PHY, and the gating switch of relay connects the end LAN1, power-off
When, the gating switch jump in relay pushes the 1st contact, directly and LAN2 by the serial ports Tx and RX on the RJ45 interface at the end LAN1
Serial ports Tx and RX conducting on the RJ45 interface at end, when powering on, the gating switch jump in relay pushes the 2nd contact, by embedding
Enter formula module control the end LAN1 and the end LAN2 on network between communicate.
Further, the memory DDR uses 1 DDR2 memory, and capacity 1Gb, the memory Flash use NAND
Flash, capacity 1Gb.
The beneficial effects of the present invention are:
Switch system safety and stability of the invention is high, and support maximum bandwidth is 200Mbps, supports global network management, energy
Allow Ethernet to work reliable and securely in harsh environment, meet rail traffic and air standard, and interchanger not by
The influence of equipment itself current state is avoided tired because of network switching bring time delays and network O&M management by hand
It is difficult.
Detailed description of the invention
Fig. 1 is the structural principle block diagram of interchanger of the present invention；
Fig. 2 is the protection circuit figure of interchanger of the present invention；
Fig. 3 is the filter circuit figure of interchanger of the present invention；
Fig. 4 is the embedded submodule block diagram of interchanger of the present invention；
Fig. 5 is the ethernet signal processing module block diagram of interchanger of the present invention；
Fig. 6 is the front-panel structure block diagram of interchanger of the present invention；
Fig. 7 is the Bypass system diagram of interchanger of the present invention.
Specific embodiment
It is below with reference to the accompanying drawings and in conjunction with the embodiments, next that the present invention will be described in detail.
As shown in Figure 1, a kind of vehicle-mounted Layer 2 switch of high reliability, the interchanger include power module, ethernet signal
Processing module, front panel and embedded submodule, wherein
The power module is by sequentially connected airborne DC power supply, protection circuit, filter circuit and DC-DC reduction voltage circuit structure
At being respectively used to anti-interference that is short-circuit, anti-reverse, eliminating spike and surge, that the common-mode signal of eliminating on power supply lowers electromagnetism is dry
It disturbs and provides the power supply of different voltages for the chip in interchanger；
As shown in figure 5, the ethernet signal processing module includes controller CPU, the controller CPU passes through RvMII interface
Ethernet Switch chip is connected, the output end output of the Ethernet Switch chip has multichannel 100 m ethernet and is connected to
Connector, Ethernet Switch chip connect ethernet PHY chip, the output of the ethernet PHY chip by SGMII interface
End output has multichannel gigabit Ethernet and is connected to connector；
The front panel is equipped with several external interfaces and internal connector, and front panel passes through internal connector and ethernet signal
Connector in processing module is correspondingly connected with, and is used for transmission multichannel 100 m ethernet and multichannel gigabit ethernet signal；
As shown in figure 4, the embedded submodule by the memory DDR of microprocessor CPU and the connection microprocessor CPU,
Memory Flash and crystal oscillator XTAL composition, wherein for microprocessor CPU for carrying out processing operation, memory DDR is micro- for keeping in
The operational data of processor CPU, memory Flash is for storing corresponding operation operating system, to ensure that software systems are stablized
Efficient operation, high efficient and reliable operational network data.
In the present embodiment, backbone network uses the Port Trunk network architecture, and trunk maximum throughput reaches 200M.
As shown in Fig. 2, the protection circuit is made of fuse, Transient Suppression Diode TVS and counnter attack diode, it is described
Fuse and Transient Suppression Diode are sequentially connected in series on the positive output channel of airborne DC power supply, be respectively used to it is anti-short circuit and
Anti-reverse, one end of the Transient Suppression Diode TVS is connected on the negative output channel of airborne DC power supply, and transient state inhibits
The other end of diode TVS and the public series side of fuse and Transient Suppression Diode link together, for eliminating spike
With surge, spike and surge jamming equipment on access are prevented.
As shown in figure 3, the filter circuit is made of common mode inductance, special filter, capacitor and inductance, by an inductance
Composition π filter is connect with two capacitor annulars, the common mode inductance, special filter and π filter are sequentially connected in series, for disappearing
Except the common-mode signal on airborne DC power supply, the noise on airborne DC power supply is filtered out, and lowers electromagnetic interference EMI, improves electricity
Magnetic compatibility EMC.
The airborne DC power supply provides 24V voltage, and the DC-DC reduction voltage circuit is made of seven power supply chips, respectively
The 24V voltage inputted by protection circuit and filter circuit is converted into 12V, 3.3V, 1.8V, 1.2V and 1.1V, for friendship
Interior each different chip of changing planes is powered.Treated, and airborne DC power supply greatly improves security of system and stability,
Meet air standard, and passed through EN50155:2001(rail truck applying electronic equipment), EN 50126(railway applications are reliable
Property, availability, maintainable and security technique condition and verifying (RAMS)) type approval test.
As shown in Figure 1 and Figure 5, the output end output of the Ethernet Switch chip has 13 road 100 m ethernets, described
The output end output of ethernet PHY chip has 4 road gigabit Ethernets.
As shown in figures 1 to 6, the internal connector on the front panel includes 8 100 m ethernet out connector M12
With 4 gigabit Ethernet out connector M12, interchanger reliability, robust can be improved using using connector M12 interface
Property.
As shown in Figure 1 and Figure 7, the gigabit Ethernet access between the output end and connector of the ethernet PHY chip
It is equipped with Bypass system.Bypass refers to (to fail and improper failure two ways, normally in network device failure containing normal
Failure mode such as manual debugging switching, improper failure meaning is wider, for example, such as power-off, hardware fault, power failure,
Connection number is more than threshold values, software deadlock or crash etc.) after, two networks can be allowed not pass through net by specific triggering state
The system of network equipment, and be directly physically connected, after having Bypass, after network device failure becomes Single Point of Faliure,
Or when these gateways carry out upgrade maintenance, inside and outside two ports physical connection are directly become into a cable, in this way
Allow the network mutual conduction being connected in this equipment, the data traffic of user can directly pass through equipment, without by equipment from
The influence of body current state is avoided because network switches bring time delays and network O&M difficult management by hand.In this reality
It applies in example, the Bypass system includes relay, the end LAN1 PHY, the end LAN1 and the end LAN2, the 1st contact of the relay
Connecting the end LAN2, the 2nd contact of relay connects the end LAN1 PHY, and the gating switch of relay connects the end LAN1, when power-off, after
Gating switch jump in electric appliance pushes the 1st contact, directly and the end LAN2 by the serial ports Tx and RX on the RJ45 interface at the end LAN1
Serial ports Tx and RX conducting on RJ45 interface, when powering on, the gating switch jump in relay pushes the 2nd contact, by embedded
It is communicated between network on the submodule control end LAN1 and the end LAN2.
The memory DDR uses 1 DDR2 memory, and capacity 1Gb, the memory Flash use NAND Flash, hold
Amount is 1Gb.
In the present embodiment, which further includes backboard, the connector on backboard, using model AMP-5100147-
1, the Z-PACK type bottom plate right angle 2mm A HM and right angle setting tube socket and socket connector are used for 2mm HM interface, provide certainly
It is installed by plate or fixed plate printed circuit board, resets shielding option with ground operates pin column contact option and various
CompactPCI mark configuration.The hard metric system A type back plane connector of these Z-PACK has UL 94V-0 polyester shell, and band is more
The mating of purposes center is directed at and has standard crosstalk device, it provides crosstalk and reduces device.Following original is followed in PCB design
Then: being rationally layered according to plank difficulty or ease；Modulus separates when layout, and high-frequency signal carries out isolation, and signal of interest does impedance matching, must
Packet ground is carried out when wanting, entire plank stratum extends out, to reduce radiation interference, it is anti-interference to improve radiation.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of vehicle-mounted Layer 2 switch of high reliability, which is characterized in that the interchanger includes power module, at ethernet signal
Manage module, front panel and embedded submodule, wherein
The power module is by sequentially connected airborne DC power supply, protection circuit, filter circuit and DC-DC reduction voltage circuit structure
At being respectively used to anti-interference that is short-circuit, anti-reverse, eliminating spike and surge, that the common-mode signal of eliminating on power supply lowers electromagnetism is dry
It disturbs and provides the power supply of different voltages for the chip in interchanger；
The ethernet signal processing module includes controller CPU, and the controller CPU connects Ethernet by RvMII interface
The output end output of Switch chip, the Ethernet Switch chip has multichannel 100 m ethernet and is connected to connector, with
Too net Switch chip connects ethernet PHY chip by SGMII interface, and the output end output of the ethernet PHY chip has
Multichannel gigabit Ethernet is simultaneously connected to connector；
The front panel is equipped with several external interfaces and internal connector, and front panel passes through internal connector and ethernet signal
Connector in processing module is correspondingly connected with, and is used for transmission multichannel 100 m ethernet and multichannel gigabit ethernet signal；
The embedded submodule is by microprocessor CPU and memory DDR, the memory of the connection microprocessor CPU
Flash and crystal oscillator XTAL composition, wherein microprocessor CPU is for carrying out processing operation, and memory DDR is for keeping in microprocessor
The operational data of CPU, memory Flash is for storing corresponding operation operating system, to ensure that software systems stability and high efficiency is transported
Row, high efficient and reliable operational network data.
2. the vehicle-mounted Layer 2 switch of high reliability according to claim 1, which is characterized in that the protection circuit is by insuring
Silk, Transient Suppression Diode TVS and counnter attack diode composition, the fuse and Transient Suppression Diode are sequentially connected in series airborne
On the positive output channel of DC power supply, it is respectively used to anti-short circuit and anti-reverse, one end company of the Transient Suppression Diode TVS
It connects on the negative output channel of airborne DC power supply, the other end and fuse and transient state of Transient Suppression Diode TVS inhibits
The public series side of diode links together, and for eliminating spike and surge, prevents spike and surge on access from interfering and sets
It is standby.
3. the vehicle-mounted Layer 2 switch of high reliability according to claim 2, which is characterized in that the filter circuit is by common mode
Inductance, special filter, capacitor and inductance composition, are connect with two capacitor annulars by an inductance and form π filter, described total
Mould inductance, special filter and π filter are sequentially connected in series, and for eliminating the common-mode signal on airborne DC power supply, are filtered out airborne
Noise on DC power supply, and lower electromagnetic interference EMI, improve Electro Magnetic Compatibility EMC.
4. the vehicle-mounted Layer 2 switch of high reliability according to claim 3, which is characterized in that the airborne DC power supply mentions
For 24V voltage, the DC-DC reduction voltage circuit is made of seven power supply chips, respectively will be defeated by protection circuit and filter circuit
The 24V voltage entered is converted into 12V, 3.3V, 1.8V, 1.2V and 1.1V, for powering to different chip each in interchanger.
5. the vehicle-mounted Layer 2 switch of high reliability according to claim 1, which is characterized in that the Ethernet Switch core
The output end output of piece has 13 road 100 m ethernets, and the output end output of the ethernet PHY chip has 4 road gigabit Ethernets.
6. the vehicle-mounted Layer 2 switch of high reliability according to claim 5, which is characterized in that the inside on the front panel
Connector includes 8 100 m ethernet out connector M12 and 4 gigabit Ethernet out connector M12.
7. the vehicle-mounted Layer 2 switch of high reliability according to claim 1 or 5, which is characterized in that the ethernet PHY core
Gigabit Ethernet access between the output end and connector of piece is equipped with Bypass system, and the Bypass system includes relay
Device, the end LAN1 PHY, the end LAN1 and the end LAN2, the 1st contact of the relay connect the end LAN2, and the 2nd contact of relay connects
Connect the end LAN1 PHY, the gating switch of relay connects the end LAN1, and when power-off, the gating switch jump in relay pushes the 1st touching
Serial ports Tx and RX of the serial ports Tx and RX on the RJ45 interface at the end LAN1 directly and on the RJ45 interface at the end LAN2 are connected point,
When powering on, the gating switch jump in relay pushes the 2nd contact, is controlled on the end LAN1 and the end LAN2 by embedded submodule
It is communicated between network.
8. the vehicle-mounted Layer 2 switch of high reliability according to claim 1, which is characterized in that the memory DDR uses 1
DDR2 memory, capacity 1Gb, the memory Flash use NAND Flash, capacity 1Gb.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811186723.XA CN109561031A (en) | 2018-10-12 | 2018-10-12 | A kind of vehicle-mounted Layer 2 switch of high reliability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811186723.XA CN109561031A (en) | 2018-10-12 | 2018-10-12 | A kind of vehicle-mounted Layer 2 switch of high reliability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109561031A true CN109561031A (en) | 2019-04-02 |
Family
ID=65864911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811186723.XA Pending CN109561031A (en) | 2018-10-12 | 2018-10-12 | A kind of vehicle-mounted Layer 2 switch of high reliability |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111131087A (en) * | 2019-12-13 | 2020-05-08 | 威创集团股份有限公司 | Transmission system and signal transmission method for Ethernet physical layer signal |
| CN111404697A (en) * | 2020-03-31 | 2020-07-10 | 北京经纬恒润科技有限公司 | Vehicle-mounted Ethernet simulation board card |
| CN111586498A (en) * | 2020-05-09 | 2020-08-25 | 贵州航天天马机电科技有限公司 | Multichannel high-speed data exchange equipment |
| 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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| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yang Cheng Inventor after: Zhao Shusheng Inventor before: Zhao Shusheng Inventor before: Yang Cheng |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190402 |