Digital node circuit board and data acquisition node

Abstract

The utility model provides a digital node circuit board and a data acquisition node. The digital node circuit board comprises a bottom board and a core control board, and the bottom board and the core control board are connected through a connector. The bottom plate comprises a digital signal conditioning module, a digital signal isolation module and an Ethernet interface module; the digital signal conditioning module is used for collecting, filtering and conditioning existing digital signals of the locomotive; the core control board is used for carrying out further data processing on the digital signal; and the Ethernet interface module is used for communicating with external equipment through an Ethernet interface. According to the utility model, independent acquisition, conditioning and data processing of existing digital signals of the locomotive can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of heavy-load freight locomotives, in particular to a digital node circuit board and a data acquisition node. Background Art

[0002] As the transportation volume of heavy-haul railways increases year by year and the departure intervals gradually shorten, the service life of locomotives increases, and the aging and fatigue of the main components of locomotives increases, which will inevitably lead to a trend of increasing subsequent failure rates year by year.

[0003] When conducting real-time fault diagnosis on a locomotive, it is necessary to obtain the status data of the locomotive's important components and important subsystems in real time to achieve rapid fault diagnosis, realize dynamic real-time evaluation of the operating health, and extend the service life of the locomotive.

[0004] Among the status data of the locomotive, a part is digital signals that do not need digital-to-analog conversion. The main digital signals include: pulse detection signal, bow raising key command, main grounding signal, motor overcurrent signal, excitation overcurrent signal, primary side overcurrent signal, bow raising solenoid valve signal, etc. Therefore, it is necessary to set up nodes that can directly access digital quantities to collect these digital signals.

[0005] Existing research on locomotive signal acquisition modules mostly focuses on the acquisition and conditioning of analog signals, and lacks an implementation method for an independent acquisition module for the locomotive's existing digital signals. In addition, digital signals and converted analog signals share the same acquisition nodes, signal paths and controllers, which is not conducive to the efficient acquisition and processing of digital signals. Utility Model Content

[0006] In order to solve the current technical problem of lack of an independent acquisition module capable of realizing the existing digital signals of a locomotive, the utility model proposes a digital node circuit board and a data acquisition node.

[0007] A first aspect of the present embodiment is disclosed, providing a digital node circuit board, comprising a baseboard and a core control board, wherein the baseboard and the core control board are connected via a connector; the baseboard comprises a digital signal conditioning module, a digital signal isolation module and an Ethernet interface module;

[0008] The digital signal conditioning module is used to collect, filter and condition the existing digital signals of the locomotive;

[0009] The core control board is used to perform further data processing on the digital signal;

[0010] The Ethernet interface module is used to communicate with external devices through the Ethernet interface.

[0011] In some implementations, the core control board includes an integrated FPGA chip and a DSP chip, wherein:

[0012] The FPGA chip is used to perform data processing on the digital signal;

[0013] The DSP chip is used to control the data processing algorithm.

[0014] In some implementations, the core control board further includes peripheral auxiliary circuits, and the auxiliary circuits include FLASH memory and SDRAM.

[0015] In some implementations, the base plate further includes:

[0016] The analog signal conditioning module is used to collect, filter and condition analog signals.

[0017] In some implementations, the baseboard further includes: an analog signal isolation module for isolating the multi-channel analog signals after filtering and conditioning.

[0018] In some implementations, the base plate further includes:

[0019] The digital signal isolation module is used to isolate multiple digital signals after filtering and conditioning.

[0020] In some implementations, the digital signal conditioning module includes a signal conditioning circuit, the signal conditioning circuit including a transient suppression diode, a first resistor, a second resistor, and a first-order filter circuit;

[0021] The input end of the signal conditioning circuit is connected to the anode of the transient suppression diode and the first end of the first resistor; the second end of the first resistor is connected to the first end of the second resistor;

[0022] The output end of the signal conditioning circuit is connected to the second end of the second resistor and the first end of the first-order filtering circuit;

[0023] The cathode of the transient voltage suppression diode and the second end of the first-order filtering circuit are both grounded.

[0024] In some implementations, the digital signal conditioning module further includes an emitter biased common-emitter amplifier circuit, and the emitter biased common-emitter amplifier circuit is arranged as a first-stage amplifier circuit before the signal conditioning circuit.

[0025] In some implementations, the Ethernet interface module includes:

[0026] A network port transformer, connected to the Ethernet interface;

[0027] The Ethernet physical layer chip is connected to the network port transformer and is used for communicating with the Ethernet MAC layer.

[0028] A second aspect of the present embodiment is disclosed, providing a data acquisition node, including a housing and the digital node circuit board as described above, wherein the housing includes a base, an upper cover, and a power supply socket and a network interface socket arranged on the base; the digital node circuit board is fixed on the base; the power supply socket and the network interface socket are respectively connected to corresponding interfaces on the digital node circuit board.

[0029] Compared with the prior art, one embodiment of the present disclosure has at least the following beneficial effects:

[0030] The digital node circuit board provided by the utility model performs pre-processing such as filtering and conditioning on the input digital signal through the digital signal conditioning module, and then further processes it through the core control board, and finally uploads the digital signal to an external device or a host computer through the Ethernet interface module for storage, analysis and display, thereby realizing independent collection, conditioning and data processing of the existing digital signals of the locomotive. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 is a block diagram of a digital node circuit board provided by an embodiment of the present disclosure;

[0033] Figure 2 is a schematic diagram of a signal conditioning circuit provided by an embodiment of the present disclosure;

[0034] Figure 3 is a structural block diagram of a core control board provided in an embodiment of the present disclosure;

[0035] Figure 4 is a functional implementation flow chart of a digital node circuit board provided by an embodiment of the present disclosure;

[0036] Figure 5 It is a schematic diagram of a node shell provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0037] The technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, rather than all the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the utility model.

[0038] Embodiment 1

[0039] This embodiment provides a digital node circuit board, such as Figure 1 As shown, it includes a base plate and a core control board, and the base plate and the core control board are connected via connectors; the base plate includes a digital signal conditioning module, a digital signal isolation module, an Ethernet interface module and a power supply module. The digital signal conditioning module is used to collect the existing digital signals of the locomotive, as well as filter and condition them. The core control board is used to perform data processing on the digital signals. The Ethernet interface module is used to communicate with external devices through an Ethernet interface. In actual applications, the Ethernet interface module can also be replaced by an interface for signal access through a local area network, or communicate using mobile data communication methods such as GSM, GPRS, and 5G. Specifically, the digital signal conditioning module includes a signal conditioning circuit. The signal conditioning circuit is as follows Figure 2As shown, the signal conditioning circuit includes a transient suppression diode D1, a first resistor R1, a second resistor R2 and a first-order filter circuit, wherein the first-order filter circuit includes a third resistor R3 and a first capacitor C1 in parallel. The input end of the signal conditioning circuit is connected to the positive electrode of the transient suppression diode D1 and the first end of the first resistor R1; the second end of the first resistor R1 is connected to the first end of the second resistor R2; the output end of the signal conditioning circuit is connected to the second end of the second resistor R2 and the first end of the first-order filter circuit; the negative electrode of the transient suppression diode D2 and the second end of the first-order filter circuit are both grounded. The function of the transient suppression diode D1 is to suppress transient overvoltage pulses and protect components in the circuit from damage. The functions of the first resistor R1 and the second resistor R2 are to suppress overcurrent. In addition, in order to achieve isolation between the inputs, the 5V power supply for digital signal conditioning is divided into four identical modules to achieve isolation between the four inputs of the same digital signal conditioning module. According to the power size of the digital signal conditioning module, the power module is selected as WRB2405SD-3WR2. The 3.3V power supply is introduced from the core control board and uses different grounding. This power module can realize external DC24V power input.

[0040] In some implementations, the core control board includes an integrated FPGA chip and a DSP chip. The FPGA chip is used to perform data processing on the digital signal; the DSP chip is used to control the data processing algorithm. The FPGA chip and the DSP chip constitute an FPGA+DSP architecture, wherein the FPGA chip serves as the core digital signal coprocessor, responsible for the signal preprocessing of the formation, including filtering, frequency conversion, and frequency decoding; the DSP chip serves as the core operation processor, responsible for the high-level control processing algorithm. The FPGA+DSP architecture takes into account both speed and flexibility, meeting both the underlying signal processing requirements and the high-level signal processing requirements. The core control board also includes peripheral auxiliary circuits, which include FLASH memory and synchronous dynamic random access memory SDRAM. The required connections mainly include DSP mode selection, clock mode selection, JTAG interface, and power supply. In actual applications, the FPGA chip can also be expanded with corresponding functional modules according to different requirements for the functions of the core control board, such as 4G modules, ARM chips, etc. In this embodiment, the structural block diagram of the core control board is as follows: Figure 3As shown, the CE0 space of the external memory bus interface EMIF is connected to a synchronous dynamic random access memory SDRAM; the CE1 space of the external memory bus interface EMIF is connected to a FLASH memory for storing programs; the CE2 and CE3 spaces of the external memory bus interface EMIF are connected to the FPGA chip. The general I / O port GPIO of the DSP chip is connected to the FPGA chip, and the INT interface of the DSP chip is connected to the FPGA chip to receive the interrupt signal sent by the FPGA chip; the power monitoring and reset circuit is connected to the RST interface of the DSP chip; the JTAG interface circuit is used to connect to the emulator for program debugging and downloading.

[0041] The design of the core control board in this embodiment adopts a DSP+FPGA architecture and integrates peripheral circuits and power module circuits, etc., which can realize control data acquisition, complete preprocessing and symptom extraction of monitoring data, provide interface signals for storage control, and perform communication control and Ethernet control with the on-board intelligent diagnostic terminal, and realize 4G and GPS algorithm control and other functions.

[0042] In some implementations, the digital signal conditioning module further includes an emitter biased common emitter amplifier circuit, which is disposed as a first-stage amplifier circuit before the signal conditioning circuit to achieve high input impedance and keep the level output state in the locomotive unaffected.

[0043] In some implementations, since there are analog signals that need to be collected near the digital acquisition nodes, and considering the actual needs of the node settings in the locomotive, the base plate also includes an analog signal conditioning module and an analog signal isolation module. The analog signal conditioning module is used to collect the existing analog signals of the locomotive, as well as filter and condition them. Specifically, the analog signal conditioning module is used to collect four analog signals for backup in actual applications. As a result, the digital node circuit board has both digital signal and analog signal conditioning modules. While accessing the existing digital signals of the locomotive, it can also access analog signals near the node, making the function more complete. In some implementations, the analog signal isolation module uses an AMC1200 precision isolation amplifier to separate the output end of the analog signal of the node from the input end circuit.

[0044] In some implementations, such as Figure 4As shown, the base plate also includes a digital signal isolation module. The digital signal isolation module is used to isolate multiple digital signals after filtering and conditioning. Specifically, the digital signal isolation module includes an ADUM1410A chip with four input and output to achieve bidirectional isolation. Among them, one ADUM1410A chip can provide four independent isolation channels, and the data rate can reach up to 10Mbps. At the same time, the grounding and 5V power supply of the four inputs are designed to be isolated from each other to avoid the common ground caused by the access to the existing signals of the locomotive. In this embodiment, the digital signal isolation module integrates 4 ADUM1410A chips, which can achieve parallel acquisition of up to 16 channels. In other embodiments, the digital signal isolation module can also use other types of multi-channel isolation chips to achieve bidirectional isolation in the signal acquisition process.

[0045] In some implementations, the Ethernet interface module includes a network port transformer and an Ethernet physical layer chip. The network port transformer is connected to the Ethernet interface; the Ethernet physical layer chip is connected to the network port transformer for communicating with the Ethernet MAC layer. Specifically, the Ethernet interface uses an RJ45 interface and needs to expand a physical layer chip. In this embodiment, the network port transformer H1102NL is connected to the Ethernet physical layer chip LAN8720A.

[0046] LAN8720A is a low-power 10 / 100M Ethernet PHY layer chip. Its I / 0 pin voltage complies with the EEE802.3-2005 standard. It supports communication with the Ethernet MAC layer through its RMⅡ interface. It has a built-in 10BASE-T / 100BASE-TX full-duplex transmission module and supports 10Mbps and 100Mbps. LAN8720A can use auto-negotiation to find the best connection mode (speed and duplex mode) with the destination host. It supports HPAutO-MDIX automatic flip function, which can change the connection to direct connection or cross-connection without changing the network cable. In addition, LAN8720A can also use a low-cost 25M crystal oscillator to generate the reference clock signal of the RMⅡ interface to reduce costs.

[0047] The digital node circuit board provided in this embodiment is connected to the existing digital signal of the locomotive. The implementation process of its digital signal acquisition is to filter, condition and other pre-process the input digital signal through the digital signal conditioning module, and then further process it through the core control board, and finally upload the digital signal to the host computer through the Ethernet interface module for storage, analysis and display.

[0048] Embodiment 2

[0049] This embodiment provides a data acquisition node, including a housing and a digital node circuit board as described in the first embodiment. The housing is designed to meet the IPX6 dust and water resistance level, which can prevent iron filings in the locomotive from entering the data acquisition node. Specifically, Figure 5 As shown, the housing includes a base 1, an upper cover 2, and a power supply air socket 3 and a network interface air socket 4 arranged on the base; the digital node circuit board is fixed on the base, and includes a bottom plate 5 and a core control board 6. The bottom plate 5 and the core control board 6 are connected through connectors. The power supply air socket 3 and the network interface air socket 4 are respectively connected to corresponding interfaces on the digital node circuit board.

[0050] It should be noted that, in this article, the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. The terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0051] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned utility model concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) to form a technical solution.

Claims

1. A digital node circuit board, characterized in that: It includes a base plate and a core control board, and the base plate and the core control board are connected through a connector; the base plate includes a digital signal conditioning module, a digital signal isolation module and an Ethernet interface module; The digital signal conditioning module is used to collect, filter and condition the existing digital signals of the locomotive; The core control board is used to perform further data processing on the digital signal; The Ethernet interface module is used to communicate with external devices through the Ethernet interface.

2. The digital node circuit board according to claim 1, characterized in that: The core control board includes an integrated FPGA chip and a DSP chip, wherein: The FPGA chip is used to perform data processing on the digital signal; The DSP chip is used to control the data processing algorithm.

3. The digital node circuit board according to claim 2, characterized in that: The core control board also includes peripheral auxiliary circuits, and the auxiliary circuits include FLASH memory and SDRAM.

4. The digital node circuit board according to claim 1, characterized in that: The base plate also includes: The analog signal conditioning module is used to collect, filter and condition analog signals.

5. The digital node circuit board according to claim 1, characterized in that: The base plate also includes: an analog signal isolation module, which is used to isolate the multi-channel analog signals after filtering and conditioning.

6. The digital node circuit board according to claim 1, characterized in that: The base plate also includes: The digital signal isolation module is used to isolate multiple digital signals after filtering and conditioning.

7. The digital node circuit board according to claim 1, characterized in that: The digital signal conditioning module includes a signal conditioning circuit, and the signal conditioning circuit includes a transient suppression diode, a first resistor, a second resistor and a first-order filter circuit; The input end of the signal conditioning circuit is connected to the anode of the transient suppression diode and the first end of the first resistor; the second end of the first resistor is connected to the first end of the second resistor; The output end of the signal conditioning circuit is connected to the second end of the second resistor and the first end of the first-order filtering circuit; The cathode of the transient voltage suppression diode and the second end of the first-order filtering circuit are both grounded.

8. The digital node circuit board according to claim 7, characterized in that: The digital signal conditioning module further comprises an emitter biased common-emitter amplifier circuit, and the emitter biased common-emitter amplifier circuit is arranged before the signal conditioning circuit as a first-stage amplifier circuit.

9. The digital node circuit board according to claim 1, characterized in that: The Ethernet interface module comprises: A network port transformer, connected to the Ethernet interface; The Ethernet physical layer chip is connected to the network port transformer and is used for communicating with the Ethernet MAC layer.

10. A data collection node, characterized in that: It comprises a shell and a digital node circuit board as described in any one of claims 1 to 9, wherein the shell comprises a base, an upper cover, and a power supply socket and a network interface socket arranged on the base; the digital node circuit board is fixed on the base; the power supply socket and the network interface socket are respectively connected to corresponding interfaces on the digital node circuit board.

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