Rocket-borne Ethernet switch

Abstract

The invention relates to the technical field of switches, and discloses a rocket-borne Ethernet switch, which comprises at least two switching modules, and any two switching modules are connected with each other; the power supply module comprises a power supply redundant circuit, the power supply redundant circuit comprises a main power supply circuit and a standby power supply circuit which are connected in parallel, voltage input by the aviation plug board is converted into working voltage of the switching module by selectively starting the main power supply circuit or the standby power supply circuit, and the working voltage is input to the switching module; the aviation plug board is provided with a plurality of network aviation plugs and a plurality of power supply input aviation plugs, the network aviation plugs are connected with the switching module through first connectors, and the power supply input aviation plugs are connected with the power supply module through second connectors. Even if a certain switching module or a power supply circuit in the rocket-borne Ethernet switch fails, normal communication can still be carried out, and the reliability of data transmission is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of switches, and in particular to an onboard Ethernet switch. Background Art

[0002] Since the first program-controlled switch appeared in 1965, switches have quickly become mainstream products in modern communication networks. Ethernet switches are data transmission devices based on the third layer (network layer) of the OSI 7-layer reference model. Network terminals are connected to the switch port through network cables and can communicate based on IP addresses.

[0003] In recent years, with the rapid development of communication services, Ethernet switches, as key equipment for network communication, have developed very rapidly, and technical indicators in various aspects have been continuously improved. Launch vehicles need to use Ethernet for data transmission on the rocket and between the rocket and the ground. At present, the Ethernet switches on rockets transmit signals through a single switching module, and only a single power supply is used. If the power supply fails or the switching module fails, data transmission will be abnormal, and the system reliability is low. Summary of the invention

[0004] In view of this, the present invention provides an arrow-borne Ethernet switch, a laser frequency conversion cavity and a laser to solve or partially solve the technical problem of low reliability of existing arrow-borne Ethernet switches.

[0005] The technical solution proposed by the present invention is as follows:

[0006] In a first aspect, the present invention provides an onboard Ethernet switch, comprising: a switching module, at least two of which are provided, and any two of which are interconnected; a power supply module, comprising a power supply redundancy circuit, wherein the power supply redundancy circuit comprises a main power supply circuit and a backup power supply circuit connected in parallel with each other, and the voltage input by an aviation plug board is converted into the working voltage of the switching module by selectively enabling the main power supply circuit or the backup power supply circuit, and the working voltage is input into the switching module; the aviation plug board is provided with a plurality of network aviation plugs and a plurality of power input aviation plugs, wherein the network aviation plug is connected to the switching module via a first connector, and the power input aviation plug is connected to the power supply module via a second connector.

[0007] An Arrow Ethernet switch of an embodiment of the present invention has at least two switching modules that can be interconnected, thereby enhancing the redundancy and flexibility of the network. At the same time, the redundant circuit design of the power module ensures the stability and continuity of the power supply. Even when there is a problem with the main power supply, the backup power circuit can immediately take over to ensure the continuous operation of the switch. Through the dual redundant mode of the switching module and the power module, even if a switching module or power circuit in the Arrow Ethernet switch fails, normal communication can still be carried out, thereby ensuring the reliability of data transmission.

[0008] Optionally, the switching module includes a switching chip, a storage circuit, a serial port circuit, a management network port circuit, a business network circuit, a reset circuit, a power supply circuit and a clock circuit. The storage circuit, the serial port circuit, the management network port circuit, the reset circuit, the power supply circuit and the clock circuit are all connected to the switching chip, and the business network circuit is connected to the management network port circuit.

[0009] In this way, a more integrated switching module is provided, and the connection between each circuit and the switching chip ensures the efficiency and stability of data processing, especially the connection between the business network circuit and the management network port circuit, which improves the convenience and real-time performance of network management.

[0010] Optionally, the power supply circuit includes a first power supply chip, a second power supply chip and a third power supply chip, the first power supply chip is used to convert the operating voltage into a first voltage and output a first PG signal at a first delay time, the first PG signal is used to enable the second power supply chip to convert the first voltage into a second voltage and output a second PG signal at a second delay time, the second PG signal is used to enable the third power supply chip to convert the second voltage into a third voltage and output a third PG signal at a third delay time, the third PG signal is used to enable the first power supply chip to output a fourth voltage, the first voltage, the second voltage and the fourth voltage are used to power the corresponding ports of the switching module, the first delay time is earlier than the second delay time, and the second delay time is earlier than the third delay time.

[0011] In this way, more stable and gradual power management is achieved through phased voltage conversion and delayed signal output. Each voltage is input to the switching module in sequence, avoiding damage to the switching module caused by voltage mutations and improving the reliability and stability of the system.

[0012] Optionally, the switching chip adopts a BCM56150 chip, the management network port circuit adopts a BCM5221 chip and is connected to the MII interface of the switching chip, and the service network circuit adopts a network transformer to lead out several service networks.

[0013] In this method, the BCM56150 chip and the BCM5221 chip are used to ensure high-speed data transmission and high efficiency of network management.

[0014] Optionally, the switching module is provided with four bypass interfaces, and the bypass interfaces of two adjacent switching modules are connected via two groups of mutually redundant relays.

[0015] In this way, by setting up bypass interfaces and redundant relays, the connection redundancy between switching modules is enhanced. Even if a problem occurs in an interface or relay, the power-off pass-through function can still be achieved, thereby improving the stability and reliability of the system.

[0016] Optionally, the switching module also includes an indicator light, a signal converter and an optocoupler isolator, the control pin of the switching module is connected to the input end of the signal converter, the output end of the signal converter is connected to the input end of the optocoupler isolator, and the output end of the optocoupler isolator is connected to the indicator light.

[0017] In this manner, the signal processing capability of the switching module and the intuitiveness of status monitoring are improved through indicator lights, signal converters and optocouplers, and the use of optocouplers enhances the stability and safety of signal transmission.

[0018] Optionally, the power supply module also includes a filter, and the aviation board is also provided with an anti-reverse connection circuit, one end of the anti-reverse connection circuit is connected to the power interface of the aviation board, the other end of the anti-reverse connection circuit is connected to the input end of the filter, and the output end of the filter is connected to the input end of the power redundancy circuit.

[0019] In this way, the anti-reverse connection circuit can prevent the power module from supplying power to the ground, and the filter can reduce the noise in the power supply, improving the stability of the power supply and the reliability of the switch.

[0020] Optionally, the anti-reverse connection circuit includes two diodes connected in parallel, one parallel end of the two diodes is connected to the power input aviation plug of the aviation plug board, and the other parallel end is connected to the input end of the filter.

[0021] In this method, the design of parallel diodes can prevent the arrow supply from charging the ground supply and avoid energy backflow.

[0022] Optionally, the power supply module further includes an inrush current suppression circuit, an input end of the inrush current suppression circuit is connected to the filter, and an output end of the inrush current suppression circuit is connected to an input end of the power supply redundancy circuit.

[0023] In this method, the surge current suppression circuit is used to suppress the surge current when the switch starts, protecting the power module from the influence of voltage surges, thereby improving the anti-interference ability and stability of the equipment.

[0024] Optionally, the surge current suppression circuit includes a first MOS tube and a second MOS tube, the drain of the first MOS tube is connected to the ground end, and is connected to the positive output end of the filter through a first resistor and a first capacitor connected in parallel, the gate of the first MOS tube is connected to the positive output end of the filter through a second resistor, a second capacitor, a third resistor and a zener diode are sequentially connected in parallel between the source of the first MOS tube and the source of the first MOS tube, the gate of the second MOS tube is connected to the gate of the first MOS tube, the source of the second MOS tube is connected to the source of the first MOS tube, and the drain of the second MOS tube is connected to the drain of the first MOS tube.

[0025] In this manner, effective suppression of surge current is achieved through reasonable configuration of MOS tubes, and the circuit structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly express the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 1 is a circuit schematic diagram of an onboard Ethernet switch according to an embodiment of the present invention;

[0028] Figure 2 Schematic diagram of the framework of the switching module in the embodiment of the present invention;

[0029] Figure 3 is a circuit schematic diagram of a switching module in an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the connection between the dynamic memory and the switching chip in an embodiment of the present invention;

[0031] Figure 5 A schematic diagram of the connection between a static memory and a switching chip in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the connection of the switch chip management network port in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the application of the BCM5221 chip in an embodiment of the present invention;

[0034] Figure 8 is a schematic diagram of a reset circuit in an embodiment of the present invention;

[0035] Fig. 9 is a schematic diagram of a power supply circuit in an embodiment of the present invention;

[0036] Fig.10 is a startup timing diagram of the output voltage of the power supply circuit in an embodiment of the present invention;

[0037] Fig.11 This is a circuit schematic diagram of 5V to 3V3 conversion in an embodiment of the present invention;

[0038] Fig.12 This is a circuit schematic diagram of 3V3 to 1V5 conversion in an embodiment of the present invention;

[0039] Fig.13 Schematic diagram of interconnection of switching modules in an embodiment of the present invention;

[0040] Fig.14 Schematic diagram of a control circuit of an ACT lamp in an embodiment of the present invention;

[0041] Fig.15 Schematic diagram of the framework of the power module in the embodiment of the present invention;

[0042] Fig.16 is a circuit schematic diagram of a power module in an embodiment of the present invention;

[0043] Fig.17 is a circuit schematic diagram of a clock circuit in an embodiment of the present invention;

[0044] Fig.18 4 is a circuit schematic diagram of an inrush current suppression circuit in an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] An onboard Ethernet switch of an embodiment of the present invention is mainly used for onboard information exchange and onboard network construction during rocket flight, provides network services for communication between onboard devices and onboard devices, and has network log viewing and downloading functions. The switch supports three-layer routing protocols. It has network management functions, supports CLI (command line interface), Telnet (remote login), Web (network page management configuration), and network management software based on SNMP (network management protocol), supports Bypass power-off direct pass function, and ring network redundancy protocol.

[0050] Its main technical indicators are:

[0051] a) Typical power supply voltage is DC28V, voltage input range is DC20V~36V, load capacitance ≯100uF;

[0052] b) The power consumption of the whole machine is not more than 42W, the startup surge current is not more than 2A, it has overvoltage / undervoltage protection, and it will not be damaged after the fault is removed;

[0053] c) The whole machine has a soft start function, and the current climbing slope is not less than 0.2A / ms;

[0054] d) Support L2 / L3 layer wire-speed forwarding;

[0055] e) The switch contains three switching modules, each of which provides no less than 16 Ethernet electrical interfaces, which can be freely configured as 10M / 100M / 1000M or adaptive, of which one is the switch management interface;

[0056] f) The switch supports no less than 4K VLANs;

[0057] g) The switching delay between any ports shall not exceed 30us;

[0058] h) The number of multicast groups supported by the switch is not less than 256;

[0059] i) Switch startup time ≯120s.

[0060] In order to solve the technical problem of insufficient reliability of the Arrow Ethernet switch in the prior art, an embodiment of the present invention provides an Arrow Ethernet switch, such as Figure 1 As shown, the Arrow Ethernet switch includes:

[0061] The switching module includes at least two switching modules, and any two switching modules are connected to each other.

[0062] Exemplarily, there are three switching modules, which are placed inside the chassis of the Arrow Ethernet switch. The three switching modules are connected in pairs to achieve data interoperability. Each module provides 16 isolated networks, and each module is designed with 4 bypass interfaces.

[0063] The switching chip used in the switching module is a single-particle BCM56150 chip, which realizes the L2 / L3 switching function, and the bypass interface is realized through relay switching.

[0064] In order to ensure stable operation of the switch card in a strong electromagnetic and electrostatic environment, an isolation ring is designed for the positioning and mounting holes of the switch module to completely isolate the signal ground and the chassis ground.

[0065] The power supply module includes a power redundancy circuit, which includes a main power supply circuit and a backup power supply circuit connected in parallel. By selectively enabling the main power supply circuit or the backup power supply circuit, the voltage input by the aviation plug-in board is converted into the working voltage of the switching module, and the working voltage is input to the switching module.

[0066] Specifically, the power hot backup function is realized by connecting the main power circuit and the backup power circuit in parallel. Normally, power is supplied through the main power circuit, and when the main power circuit is abnormal, power is supplied through the backup power circuit. The abnormality of one power module does not affect the operation of the equipment.

[0067] The aviation plug board is provided with a plurality of network aviation plugs and a plurality of power input aviation plugs. The network aviation plugs are connected to the switching module through a first connector, and the power input aviation plugs are connected to the power module through a second connector.

[0068] Specifically, the network aviation plug and the power input aviation plug are welded to the aviation plug board, the first connector uses a standard CPCI-E connector, the second connector uses a power connector, the switching module and the power module are respectively arranged on the corresponding circuit boards, and the aviation plug board, the switching module and the power module are connected and fixed in the chassis with screws to ensure shock resistance and reliability.

[0069] Furthermore, in specific applications, the Arrow Ethernet switch of the embodiment of the present invention uses aluminum alloy 7075 as the switch structure material according to the lightweight requirement, and heat dissipation adopts the front and rear surface heat dissipation method.

[0070] A sealing groove is required on the sealing surface of the chassis, and the thickness of this circle is partially increased, which not only achieves sealing but also ensures the installation strength. Secondly, the thickness of the heat dissipation surface is increased, but it is designed in the form of fins, which achieves heat dissipation, reduces weight and ensures strength. Finally, the top cover is made as thin as possible while ensuring strength, and is equipped with reinforcing ribs to make it as lightweight as possible.

[0071] The switch installation position is equipped with a shock-absorbing pad device, which is light in weight and has good shock-absorbing effect; reinforcing ribs are added at the four corners of the shock absorber to prevent product deformation caused by vibration; all mounting screws are coated with thread glue to ensure the firmness of the structure.

[0072] A 2mm wide sealing groove is designed at the joint surface of the chassis shell and the cover, which is assembled with a circular conductive rubber sealing ring with a diameter of 2mm. The compression rate of the sealing ring is about 20%, which ensures the overall sealing effect of the equipment. With the help of the conductive properties of the rubber ring, the electromagnetic shielding effect of the equipment is improved.

[0073] When designing the circuit, the number of PCB routing layers was increased without increasing the PCB size, and the integration of single-board components was improved to ensure that the size of the chassis is as small as possible to meet the requirements of small arrow-mounted installation space.

[0074] The Arrow Ethernet switch has the characteristics of high integration, good vibration resistance, high real-time data transmission and high data transmission reliability.

[0075] An Arrow Ethernet switch of an embodiment of the present invention has at least two switching modules that can be interconnected, thereby enhancing the redundancy and flexibility of the network. At the same time, the redundant circuit design of the power module ensures the stability and continuity of the power supply. Even when there is a problem with the main power supply, the backup power circuit can immediately take over to ensure the continuous operation of the switch. Through the dual redundant mode of the switching module and the power module, even if a switching module or power circuit in the Arrow Ethernet switch fails, normal communication can still be carried out, thereby ensuring the reliability of data transmission.

[0076] In some embodiments, the switching module includes a switching chip, a storage circuit, a serial port circuit, a management network port circuit, a business network circuit, a reset circuit, a power supply circuit and a clock circuit. The storage circuit, the serial port circuit, the management network port circuit, the reset circuit, the power supply circuit and the clock circuit are all connected to the switching chip, and the business network circuit is connected to the management network port circuit.

[0077] like Figure 2 and Figure 3As shown in the figure, the switch module is the core module of the equipment's business and control. Each switch module provides 16 10 / 100 / 1000Mbps adaptive Ethernet service ports and 1

[0078] 10 / 100 / 1000Mbps adaptive Ethernet management port. Realizes link selection control, switching function, network security control function, data flow control function, reporting function of main link, and network management function.

[0079] Specifically, in an embodiment of the present invention, the switching chip adopts the BCM56150 chip, which can provide 24 standard Gigabit Ethernet electrical interfaces (16 PHY chips are integrated internally), 2 QSGMII interfaces (each QSGMII interface can be expanded to 4 Gigabit ports by adding a PHY chip), and 4 HiGig ports.

[0080] The CPU processor of the Arrow Ethernet switch uses the ARM9 processor built into the BCM56150 chip, which is used as the operating platform for the TCP / IP protocol stack and related application layer software. Therefore, it can save external CPU processors; the chip integrates 16 PHY functions, which can save external PHY chips, reduce node failures, reduce power consumption and improve integration.

[0081] In this solution, the interconnection of the switching modules is realized using HiGig ports. The BCM56150 chip provides a 10G interface, which is used to interconnect any two switching modules. There may be bandwidth bottlenecks when two switching modules are connected to each other. When two switching modules send data to another module at the same time, the bandwidth will be affected. The use of 10G interfaces can meet the 1G data transmission requirements when interconnected. The schematic diagram of the interconnection pins of the switching chip is shown in the figure below. Fig.13 shown.

[0082] The switching module also includes storage circuits, serial port circuits, management network port circuits, business network circuits, reset circuits, power supply circuits, clock circuits and other circuits.

[0083] The serial port circuit is mainly used for equipment debugging and status monitoring. When a switch module fails, the information printed through this port can quickly locate the fault. The core chip of the serial port circuit is MAX3232EIPWR.

[0084] like Figure 4 and Figure 5As shown, the storage circuit is divided into two parts: dynamic memory and static storage. The dynamic memory is used for running the program. The chip is Samsung's DDR3, frequency 1333Mhz, capacity 2Gb, model K4B2G1646E-BIK0 memory particles; the static memory is used for storing the program. The chip is Cypress's Flash particles with a capacity of 256Mb, SPI bus, and model S25FL256SAGMFI.

[0085] like Figure 6 and Figure 7 As shown in the figure, the management network port circuit uses the BCM5221 chip as the PHY chip, which is interconnected with the MII interface of the switch chip to complete system monitoring, log downloading, remote upgrade and other functions. The BCM5221 chip is a single-port RMII10 / 100BASE-TX transceiver and is the industry's lowest power Fast Ethernet PHY. The device has an integrated voltage regulator and can be powered by a 2.5V or 3.3V power supply. It integrates a variety of intelligent power management features, including three low-power modes with different power consumption levels.

[0086] The service network circuit uses the built-in 16-channel PHY function of the BCM56150 chip and the network transformer H5020L to lead out 16-channel service networks to realize the exchange and forwarding of network data.

[0087] like Figure 8 As shown, the reset chip of the reset circuit uses 74LCX245 to expand the reset signal to reset the main chips respectively. The internal logic signal of the BCM56150 chip starts working at least 5ms after all voltages are normal. The reset signal is controlled by the SYSTEM_RESET pin of the logic control chip delay design.

[0088] Clock circuit such as Fig.17 As shown, BCM56150 requires an external clock as a 25MHZ reference clock, and the crystal resonator uses Epson's 25Mhz, model X1E0000210352 crystal oscillator.

[0089] The power supply circuit needs to provide the working chip with the voltage required for operation. The voltage sizes are DC3.3V, DC1.5V and DC1.0V respectively, and the voltage fluctuation range is controlled within 5%.

[0090] The working principle of the switching module is as follows: the switching chip starts to be reset within the set time. After initialization, the switching chip reads the startup information from the Flash and runs the system program in the DDR; data is exchanged through the business network port, and resources are configured through the management network port.

[0091] In this way, a more integrated switching module is provided, and the connection between each circuit and the switching chip ensures the efficiency and stability of data processing, especially the connection between the business network circuit and the management network port circuit, which improves the convenience and real-time performance of network management.

[0092] In some embodiments, the power supply circuit includes a first power supply chip, a second power supply chip and a third power supply chip. The first power supply chip is used to convert the operating voltage into a first voltage and output a first PG signal at a first delay time. The first PG signal enables the second power supply chip to convert the first voltage into a second voltage and output a second PG signal at a second delay time. The second PG signal enables the third power supply chip to convert the second voltage into a third voltage and output a third PG signal at a third delay time. The third PG signal enables the first power supply chip to output a fourth voltage. The first voltage, the second voltage and the fourth voltage are used to power the corresponding ports of the switching module. The first delay time is earlier than the second delay time, and the second delay time is earlier than the third delay time.

[0093] Specifically, the working voltage, the first voltage, the second voltage, the third voltage and the fourth voltage are 5V, 3V3, 1V5, 0V75 and 1V0 respectively, wherein each port of the switching module needs 3V3, 1V5 and 1V0 voltages for power supply.

[0094] like Fig. 9 , Fig.10 , Fig.11 and Fig.12 As shown, the first power chip, the second power chip and the third power chip are respectively selected from TPS53319 chip, TPS51200 chip and TPS62095 chip.

[0095] The TPS53319 chip, TPS51200 chip and TPS62095 chip all have enable pins and PG pins. The input voltage enters the power module through the aviation plug board, and the power module converts the input voltage into a 5V working voltage output. The 5V working voltage is converted to a 3V3 voltage through the TPS53319 chip, and the first PG signal is output at the first delay moment. The first delay moment is when the TPS53319 chip starts to output the required power after receiving the enable signal and the required power reaches 95% and is delayed by 1ms.

[0096] The 3V3 voltage is converted into a 1V5 voltage through the TPS62095 chip, and a second PG signal is output at the second delay time. The second delay time is when the TPS62095 chip starts to output the required amount of electricity, after the required amount of electricity reaches 95% and is delayed for 1ms.

[0097] The 1V5 voltage outputs 0.75V voltage through the TPS51200 chip, and outputs the third PG signal at the third delay time. PG enables the TPS53319 chip to output 1.0V voltage. When the external power supply stops, the power supply output inside the switching module stops. The order is 5V->3V3->1V5->0V75->1V0. The power timing Fig.10 shown.

[0098] In this method, the PG signal is used as the enable signal for the next power demand. The power startup sequence is ensured by using the PG signal of the previous power as the enable signal for the next power. More stable power management is achieved. Each voltage is input to the switching module in sequence, avoiding damage to the switching module caused by voltage mutations and improving the reliability and stability of the system.

[0099] In some embodiments, the switching module is provided with four bypass interfaces, and the bypass interfaces of two adjacent switching modules are connected via two sets of mutually redundant relays.

[0100] The bypass interface is a special 100M interface that allows the two ports connected by the relay to communicate directly after an accidental power failure.

[0101] Specifically, route switching is achieved through relays, and impedance control is performed according to the impedance of the standard network. At the same time, redundant backup control is performed. The redundant relay is arranged at a 90° angle with the used relay. The relay uses Panasonic's monostable double-pole double-throw relay, model "TX2-5V", and the parameters are as follows:

[0102] Contact resistance: ≤100mΩ;

[0103] Contact material: AgPd+gold plating;

[0104] Electric shock load: 2A 60VDC;

[0105] Maximum switching power: 62.5A / 60W;

[0106] Mechanical durability: 1x10 8 Second-rate;

[0107] Electrical durability: 1x10 5 Second-rate.

[0108] In this way, by setting up bypass interfaces and redundant relays, the connection redundancy between switching modules is enhanced. Even if a certain interface or relay has a problem, the power-off direct pass function can still be realized, which improves the stability and reliability of the system.

[0109] In some embodiments, the switching module also includes an indicator light, a signal converter and an optocoupler isolator. The control pin of the switching module is connected to the input end of the signal converter, the output end of the signal converter is connected to the input end of the optocoupler isolator, and the output end of the optocoupler isolator is connected to the indicator light.

[0110] Specifically, the indicator lights include a link light and an act light, and the signal converter uses a 74HC164D chip.

[0111] like Fig.14 As shown, the main chip of the switching module, that is, the switching chip BCM56150, leads out the link light and the act light respectively, connects to the CPCI-X connector, and then outputs to the aviation plug through the aviation plug board. The act light flashes through the M6 ​​pin and the M7 pin and the 74HC164D chip.

[0112] At the same time, the output indicator light signal is isolated and processed by using the optocoupler isolator OR-3H7-TA1-(GK) from Orient. The parameters of the optocoupler isolator are as follows:

[0113] Forward current: 50mA;

[0114] Direction voltage: 6V;

[0115] Power consumption: 70mW;

[0116] Working temperature: -55℃~125℃.

[0117] In this manner, the signal processing capability of the switching module and the intuitiveness of status monitoring are improved through indicator lights, signal converters and optocouplers, and the use of optocouplers enhances the stability and safety of signal transmission.

[0118] According to some embodiments of the present invention, the power module also includes a filter, and the aviation board is also provided with an anti-reverse connection circuit, one end of the anti-reverse connection circuit is connected to the power interface of the aviation board, the other end of the anti-reverse connection circuit is connected to the input end of the filter, and the output end of the filter is connected to the input end of the power supply redundancy circuit.

[0119] Taking the design power consumption of the switching module of 19.5W (50% margin) as the load of the power supply, the selected power module must meet the power requirements of the switch and ensure margin.

[0120] Refer to the following machine power consumption analysis:

[0121]

[0122]

[0123] like Fig.15 and Fig.16As shown, in the embodiment of the present invention, a filter is added to the front end of the power module input to ensure the EMI effect. After the 28V DC input is converted by the power module, a 5V / 4A DC is output for use by the switching module.

[0124] Arrow power supply (arrow power supply for short) and ground power supply (ground power supply for short) are two different types of power supply. There is a situation where both types of power supply are used to power the switch at the same time. Anti-backflow measures should be taken inside the switch, that is, the arrow power supply should be prevented from charging the ground power supply through the anti-reverse connection circuit.

[0125] Specifically, the anti-reverse connection circuit includes two diodes connected in parallel, one parallel end of the two diodes is connected to the power input aviation plug of the aviation plug board, and the other parallel end is connected to the input end of the filter.

[0126] Through the design of parallel diodes, the arrow supply is prevented from charging the ground supply, energy backflow is avoided, and the stability of the power supply and the reliability of the switch are improved.

[0127] Furthermore, the power module also includes a surge current suppression circuit, the input end of the surge current suppression circuit is connected to the filter, and the output end of the surge current suppression circuit is connected to the input end of the power redundancy circuit. The surge current suppression circuit is used to suppress the surge current when the switch is started, protect the power module from the influence of voltage surges, and improve the anti-interference ability and stability of the device.

[0128] Specifically, Fig.18 As shown, the surge current suppression circuit includes a first MOS tube Q3 and a second MOS tube Q10, the drain of the first MOS tube Q3 is connected to the ground terminal, and is connected to the positive output terminal of the filter through a first resistor R44 and a first capacitor C25 connected in parallel with each other, the gate of the first MOS tube Q3 is connected to the positive output terminal of the filter through a second resistor FR5, a second capacitor C29, a third resistor FR6 and a voltage regulator diode D9 are sequentially connected in parallel between the source of the first MOS tube Q3 and the source of the first MOS tube Q3, the gate of the second MOS tube Q10 is connected to the gate of the first MOS tube Q3, the source of the second MOS tube Q10 is connected to the source of the first MOS tube Q3, and the drain of the second MOS tube Q10 is connected to the drain of the first MOS tube Q3.

[0129] The first MOS tube Q10 is connected in series to the ground wire of the bus. At the moment of startup, Q10 absorbs the surge current. FR5\FR6\D9\C29 forms an RC delay network. After startup, the first MOS tube Q3 is driven to open and Q10 is bypassed to reduce the bus loss and achieve the surge current suppression effect at startup.

[0130] In this manner, effective suppression of surge current is achieved through reasonable configuration of MOS tubes, and the circuit structure is simple.

[0131] Furthermore, according to the embodiment of the present invention, the external interfaces on the aviation plug board are all in the form of aviation plugs.

[0132] The number of interfaces is as follows:

[0133]

[0134] Among them, the power interface is mainly responsible for supplying power to the switch, and the connector model is J599 / 20MD19SN.

[0135] The network interface is J599 / 20FJ08SN-411 / (8-CF82 / 411-01), which provides 8-way Gigabit network interface.

[0136] The indicator light interface uses the J599 / 20MJ93SN connector to provide indicator lights for three sets of switching modules.

[0137] An onboard Ethernet switch according to an embodiment of the present invention has at least the following beneficial effects:

[0138] By setting up at least two switching modules, the two switching modules can be interconnected, which enhances the redundancy and flexibility of the network. At the same time, the redundant circuit design of the power module ensures the stability and continuity of the power supply. Even when there is a problem with the main power supply, the backup power circuit can take over immediately to ensure the continuous operation of the switch. Through the dual redundant mode of the switching module and the power module, even if a switching module or power circuit in the Arrow Ethernet switch fails, normal communication can still be carried out, ensuring the reliability of data transmission.

[0139] The input of the power module is a DC20V~DV36V wide voltage input. After passing through the aviation plug-in board, it is input to the anti-reverse connection circuit and filter to prevent the arrow supply from charging the ground supply, avoid energy backflow, improve the stability of the power supply and the reliability of the switch, and realize direct isolation of complex electromagnetic environments.

[0140] The surge current suppression circuit is used to suppress the surge current when the switch starts, protecting the power module from voltage surges and improving the anti-interference ability and stability of the equipment.

[0141] The first power chip, the second power chip and the third power chip of the power module use the PG signal as the enable signal for the next power requirement. The startup sequence of the power supply is ensured by using the PG signal of the previous power as the enable signal for the next power, thereby achieving more stable power management. Each voltage is input into the switching module in sequence, avoiding damage to the switching module caused by voltage mutations and improving the reliability and stability of the system.

[0142] By setting up bypass interfaces and redundant relays, the connection redundancy between switching modules is enhanced. Even if a problem occurs in an interface or relay, the power-off pass-through function can still be achieved.

[0143] Although example embodiments and their advantages have been described in detail, those skilled in the art may make various changes, substitutions and modifications to these embodiments without departing from the spirit and defined scope of the present invention, and such modifications and variations are all within the defined scope.

Claims

1. An onboard Ethernet switch, characterized in that: include: A switching module, wherein at least two switching modules are provided, and any two switching modules are connected to each other; A power supply module, including a power supply redundancy circuit, wherein the power supply redundancy circuit includes a main power supply circuit and a backup power supply circuit connected in parallel with each other, and converts the voltage input by the flight plug-in board into the working voltage of the switching module by selectively enabling the main power supply circuit or the backup power supply circuit, and inputs the working voltage into the switching module; The aviation plug board is provided with a plurality of network aviation plugs and a plurality of power input aviation plugs. The network aviation plugs are connected to the switching module through a first connector, and the power input aviation plugs are connected to the power module through a second connector.

2. The Arrow Ethernet switch according to claim 1, characterized in that: The switching module includes a switching chip, a storage circuit, a serial port circuit, a management network port circuit, a business network circuit, a reset circuit, a power supply circuit and a clock circuit. The storage circuit, the serial port circuit, the management network port circuit, the reset circuit, the power supply circuit and the clock circuit are all connected to the switching chip, and the business network circuit is connected to the management network port circuit.

3. The Arrow Ethernet switch according to claim 2, characterized in that: The power supply circuit includes a first power supply chip, a second power supply chip and a third power supply chip. The first power supply chip is used to convert the operating voltage into a first voltage and output a first PG signal at a first delay time. The first PG signal enables the second power supply chip to convert the first voltage into a second voltage and output a second PG signal at a second delay time. The second PG signal enables the third power supply chip to convert the second voltage into a third voltage and output a third PG signal at a third delay time. The third PG signal enables the first power supply chip to output a fourth voltage. The first voltage, the second voltage and the fourth voltage are used to power corresponding ports of the switching module. The first delay time is earlier than the second delay time, and the second delay time is earlier than the third delay time.

4. The Arrow Ethernet switch according to claim 2, characterized in that: The switching chip adopts the BCM56150 chip, the management network port circuit adopts the BCM5221 chip and is connected with the MII interface of the switching chip, and the service network circuit adopts a network transformer to lead out several service networks.

5. The Arrow Ethernet switch according to claim 1, characterized in that: The switching module is provided with four bypass interfaces, and the bypass interfaces of two adjacent switching modules are connected via two groups of mutually redundant relays.

6. The Arrow Ethernet switch according to claim 1, characterized in that: The switching module also includes an indicator light, a signal converter and an optocoupler isolator. The control pin of the switching module is connected to the input end of the signal converter, the output end of the signal converter is connected to the input end of the optocoupler isolator, and the output end of the optocoupler isolator is connected to the indicator light.

7. The Arrow Ethernet switch according to claim 1, characterized in that: The power supply module also includes a filter. The aviation board is also provided with an anti-reverse connection circuit. One end of the anti-reverse connection circuit is connected to the power interface of the aviation board, the other end of the anti-reverse connection circuit is connected to the input end of the filter, and the output end of the filter is connected to the input end of the power redundancy circuit.

8. The Arrow Ethernet switch according to claim 7, characterized in that: The anti-reverse connection circuit includes two diodes connected in parallel, one parallel end of the two diodes is connected to the power input aviation plug of the aviation plug board, and the other parallel end is connected to the input end of the filter.

9. The Arrow Ethernet switch according to claim 7, characterized in that: The power supply module further includes an inrush current suppression circuit, an input end of the inrush current suppression circuit is connected to the filter, and an output end of the inrush current suppression circuit is connected to an input end of the power supply redundancy circuit.

10. The Arrow Ethernet switch according to claim 9, characterized in that: The surge current suppression circuit comprises a first MOS tube and a second MOS tube, wherein the drain of the first MOS tube is connected to a ground terminal and is connected to a positive output terminal of the filter through a first resistor and a first capacitor connected in parallel with each other, the gate of the first MOS tube is connected to the positive output terminal of the filter through a second resistor, a second capacitor, a third resistor and a voltage regulator diode are sequentially connected in parallel between the source of the first MOS tube and the source of the first MOS tube, the gate of the second MOS tube is connected to the gate of the first MOS tube, the source of the second MOS tube is connected to the source of the first MOS tube, and the drain of the second MOS tube is connected to the drain of the first MOS tube.

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