Turnout indication pulse voltage rapid acquisition device

Abstract

The utility model provides a turnout indication pulse voltage rapid acquisition device. The turnout indication pulse voltage rapid acquisition device comprises a voltage acquisition input interface, a photoelectric isolation amplification circuit, a high-speed AD sampling circuit, an MCU controller and an Ethernet transmission interface which are connected in sequence. The voltage acquisition input interface comprises at least one path of input terminal, and each path of input terminal is connected with one path of resistance voltage division sampling circuit; the photoelectric isolation amplification circuit is connected with each resistance voltage-dividing sampling circuit and is used for performing isolation conversion on the pulse voltage signals acquired by the resistance voltage-dividing sampling circuits; the high-speed AD sampling circuit is used for acquiring the amplitude of the pulse voltage signal sent by the photoelectric isolation amplifying circuit at a high speed; and the MCU controller is used for sending the amplitude of the pulse voltage signal acquired by the high-speed AD sampling circuit to a signal centralized monitoring station machine through an Ethernet transmission interface.

Description

TECHNICAL FIELD

[0001] The utility model relates to railway signal centralized monitoring technical field, specifically, relate to a kind of turnout indicating pulse voltage rapid acquisition device. BACKGROUND

[0002] Railway signal centralized monitoring system carries out real-time monitoring and intelligent analysis to railway signal equipment, and turnout indicating voltage is an important index reflecting turnout signal equipment state, and railway signal centralized monitoring system needs to monitor and collect turnout indicating voltage.

[0003] In existing microcomputer interlocking and part of full electronic interlocking system, the voltage in turnout indicating circuit is continuous mixed voltage containing direct current component and 50Hz alternating current component, both turnout indicating voltage acquisition device in railway signal centralized monitoring system can be collected and the alternating current component, direct current component of turnout indicating voltage is respectively handled by algorithm, and direct current voltage value, alternating voltage value is transmitted to signal centralized monitoring station machine by CAN interface or serial port.

[0004] Now also part of full electronic interlocking system, the voltage in turnout indicating circuit is positive and negative pulse, and pulse amplitude, pulse width is changed in different scenes, and existing turnout indicating voltage acquisition device is not applicable to handle pulse form indicating voltage, so a kind of turnout indicating pulse voltage rapid acquisition device is needed to be designed to handle the turnout indicating voltage of pulse waveform.

[0005] In order to solve the above problems, people have been seeking an ideal technical solution. SUMMARY

[0006] Therefore, it is necessary to provide a kind of turnout indicating pulse voltage rapid acquisition device for the above technical problems.

[0007] In order to realize the above purpose, the utility model provides a kind of turnout indicating pulse voltage rapid acquisition device in the first aspect, it includes: including voltage acquisition input interface, photoelectric isolation amplification circuit, high-speed AD sampling circuit, MCU controller and Ethernet transmission interface connected in sequence;

[0008] The voltage acquisition input interface includes at least one input terminal, and each input terminal is connected with a resistance voltage division sampling circuit;

[0009] The photoelectric isolation amplification circuit is connected with each resistance voltage division sampling circuit respectively, for converting the pulse voltage signal collected by the resistance voltage division sampling circuit;

[0010] The high-speed AD sampling circuit is used for high-speed acquisition of the amplitude of the pulse voltage signal sent by the photoelectric isolation amplification circuit;

[0011] The MCU controller is configured to send the amplitude of the pulse voltage signal collected by the high-speed AD sampling circuit to a signal centralized monitoring station through an Ethernet transmission interface.

[0012] Further, the MCU controller further comprises a sign conversion unit configured to convert the unsigned digital signal output by the high-speed AD sampling circuit into a signed digital signal and perform buffering processing.

[0013] The present application has the following advantages:

[0014] The existing turnout indicating voltage collection device cannot collect pulse-type turnout indicating voltage, and the present application provides a real-time collection monitoring device suitable for pulse-type turnout indicating voltage, which fills the gap of pulse-type turnout indicating voltage collection device.

[0015] Specifically, the voltage is sampled by using a high-speed AD sampling circuit, and at least one pulse voltage is collected at the same time, and finally data transmission is performed by using an Ethernet transmission interface, so that the device has the advantages of wide input range, high sampling frequency, large amount of collected data, fast data transmission speed and convenient networking.

[0016] Finally, the device meets the safety requirements related to turnout indicating voltage collection of the technical conditions of the railway signal centralized monitoring system, meets the fault safety principle, and the collector does not affect the normal work of the measured signal equipment in normal or fault state. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a principle block diagram of the turnout indicating pulse voltage fast collection device of the present application;

[0018] Figure 2 is a principle block diagram of the turnout indicating pulse voltage fast collection device of the present application;

[0019] Figure 3 is an AC switch machine turnout indicating voltage collection wiring schematic diagram;

[0020] Figure 4 is a DC switch machine turnout indicating voltage collection wiring schematic diagram. DETAILED DESCRIPTION

[0021] In the pulse signal collection process, the determination of the sampling frequency is a key factor in the real-time collection process. The sampling frequency must be high enough to accurately collect the rapid changes of the pulse signal. According to the Shannon sampling theorem, the sampling frequency should be at least twice the highest frequency of the signal, so as to ensure the recovery and reconstruction of the signal. Therefore, the present embodiment designs a real-time collection monitoring device suitable for pulse-type turnout indicating voltage based on a high-speed AD sampling circuit.

[0022] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0023] Example 1

[0024] This embodiment provides a device for rapidly acquiring turnout indication pulse voltage, such as... Figure 1 As shown, it includes: a voltage acquisition input interface, an opto-isolated amplifier circuit, a high-speed AD sampling circuit, an MCU controller, and an Ethernet transmission interface, which are connected in sequence.

[0025] The voltage acquisition input interface is used to connect to the turnout switch machine to acquire the voltage signal representing the turnout. Specifically, the voltage acquisition input interface includes at least one input terminal, and each input terminal is connected to a resistor divider sampling circuit.

[0026] Furthermore, the resistor voltage divider sampling circuit converts the input strong voltage signal into a weak voltage signal on the order of several hundred millivolts, and then sends it to the subsequent processing stage.

[0027] It is understood that the resistor voltage divider sampling circuit also includes overvoltage protection and overcurrent protection devices. Specifically, the overvoltage protection device employs transient voltage suppressors and other similar devices to protect the downstream circuit when there is an excessively high voltage surge at the input terminal. The overcurrent protection device employs fuses, thermistors, and other similar devices to blow and protect the downstream circuit when there is a high voltage surge at the input terminal or a short circuit fault in the sampling circuit causing excessive current, ensuring that a fault in the high-resistance voltage divider sampling circuit will not affect the normal operation of the signal equipment. It should be noted that the resistor voltage divider sampling circuit is a common circuit in this field and will not be described in detail here.

[0028] The opto-isolated amplifier circuit is connected to each resistor voltage divider sampling circuit, and is used to isolate the pulse voltage signal collected by the resistor voltage divider sampling circuit and convert it into a voltage signal that is adapted to the subsequent high-speed AD sampling circuit.

[0029] In one embodiment, the opto-isolation amplifier circuit includes a linear optocoupler, an operational amplifier, and peripheral devices. Through voltage boosting, isolation conversion, and voltage amplification operations, it isolates and converts the pre-processed voltage signal into a voltage signal suitable for processing by the acquisition processor. It should be noted that the linear optocoupler and operational amplifier are common circuits in the art and will not be described in detail here.

[0030] The high-speed AD sampling circuit is used to acquire the amplitude of the pulse voltage signal sent by the opto-isolated amplifier circuit at high speed.

[0031] In an embodiment, the high-speed AD sampling circuit comprises a single-ended differential conversion circuit, a bias and reference circuit, and a high-speed ADC sampling chip, the bias and reference circuit is configured to provide a positive bias voltage signal or a negative bias voltage signal, the single-ended differential conversion circuit is configured to convert the pulse voltage signal sent by the opto-isolating amplification circuit into a differential signal based on the positive bias voltage signal or the negative bias voltage signal, and the high-speed ADC sampling chip is configured to convert the amplitude of the differential signal into an unsigned digital signal.

[0032] It should be noted that the single-ended differential conversion circuit and the bias and reference circuit are both common circuits in the art, and will not be described in detail here; the high-speed ADC sampling chip can be selected from common high-speed AD converters such as AD9224 and AD9613.

[0033] The MCU controller is configured to send the amplitude of the pulse voltage signal collected by the high-speed AD sampling circuit to the signal centralized monitoring station through an Ethernet transmission interface.

[0034] Specifically, the MCU controller can be a common single-chip microcomputer or a common processor such as a DSP, and will not be limited here.

[0035] In an embodiment, the MCU controller comprises a serial port module, the Ethernet transmission interface adopts an Ethernet serial port conversion module, and the MCU controller and the Ethernet transmission interface are connected in a serial port mode. The Ethernet transmission interface is a 10 / 100M adaptive Ethernet port.

[0036] In actual operation, the Ethernet transmission interface is used to establish a network TCP connection with the signal centralized monitoring station, and after the TCP connection is established, the MCU controller forwards the collected amplitude data to the signal centralized monitoring station through the network TCP connection channel.

[0037] In another embodiment, the MCU controller is a microprocessor with a built-in high-speed AD converter, and the high-speed AD sampling circuit adopts the high-speed AD converter built in the MCU controller. In specific implementation, a processor with a built-in high-speed AD converter can be selected as the MCU controller according to requirements, such as a DSP series chip or an STM32 series single-chip microcomputer.

[0038] In this embodiment, the MCU controller further has a multi-channel AD sampling input port and a serial communication interface.

[0039] Taking the MCU controller having 4 AD sampling input ports and a 12-bit AD converter as an example, the 4 AD sampling input ports of the MCU controller are connected to the output of multiple opto-isolated amplifier circuits. The MCU controller samples and converts the 4 AD inputs sequentially every 1ms to achieve 1kHz sampling and AD conversion. An AD interrupt is generated once when all 4 AD conversions are completed.

[0040] The MCU controller packages the data in the AD interrupt handling subroutine and waits for data transmission.

[0041] It should be noted that, under normal circumstances, the digital signal after AD conversion is an unsigned digital signal. After receiving the unsigned digital signal, the signal central monitoring station obtains the corresponding voltage value through data conversion and identifies positive and negative pulses.

[0042] Since the signal centralized monitoring station connects to several turnout pulse voltage rapid acquisition devices, in order to reduce the data conversion pressure on the signal centralized monitoring station, this embodiment can also add a data conversion process before data packaging. Specifically, in the AD interrupt handling subroutine, the MCU controller first reads the AD conversion results of the four inputs, then subtracts the zero-point coefficient from the AD value and multiplies it by the linear coefficient to obtain the acquired voltage. Similarly, each acquired voltage is represented by two bytes after conversion, with a unit of 0.02V. For example, 10000 represents 200V, and -10000 represents -200V.

[0043] It should be noted that if the collected data is sent once per second, the data volume is large, the memory consumption is large, and the serial port usage time is long. To distribute the transmission pressure, this embodiment sends one data packet every 100ms. Each data packet contains 800 bytes of voltage acquisition data from 4*100 points. Specifically, as shown... Figure 2 As shown, in this embodiment, the collected voltage obtained after data conversion is stored in the data processing buffer. After the number of collected voltage values ​​in the data processing buffer reaches 400, they are transferred to the data sending buffer for packaging. Each package contains 400 points of 800 bytes of collected voltage values. The packaged data also includes necessary information such as data type and time stamp. After the data is packaged, a data sending flag is set, and the data is ready for Ethernet transmission.

[0044] In another embodiment, the Ethernet transmission interface is composed of an embedded Ethernet serial port conversion module and peripheral devices, that is, the Ethernet transmission interface and the MCU controller are integrally designed. The serial port side of the Ethernet serial port conversion module is used for connecting with the serial port of the MCU controller to communicate with the MCU controller at an agreed serial port rate. The network port side of the Ethernet serial port conversion module is a 10 / 100M adaptive Ethernet port, which can set IP and port and works in a TCP server mode. The signal centralized monitoring station machine is used as a client to initiate and establish a network TCP connection. After the TCP connection is established, the collected data sent by the MCU controller to the Ethernet serial port conversion module through the serial port are forwarded to the signal centralized monitoring station machine through the network TCP connection channel.

[0045] It can be understood that, in a specific setting, the Ethernet transmission interface, the high-speed AD sampling circuit and the MCU controller can also be integrally designed.

[0046] Finally, the turnout representation pulse voltage rapid acquisition device is also provided with a DC power supply input interface for supplying power to the entire acquisition device.

[0047] Specifically, the embodiment has the following advantages:

[0048] Wide input range: the voltage input range is -200V to +200V, the collected data is reported according to the signed number, the collected data contains voltage polarity, and positive and negative pulse voltages can be processed; the device can withstand high voltage input during turnout operation without failure;

[0049] High sampling frequency: the sampling frequency reaches 1kHz, 1000 sampling points per second per input, which can capture the rapid change of the turnout representation voltage and is very suitable for collecting pulse waveforms or other complex waveforms of the turnout representation voltage;

[0050] Large amount of collected data: 1000 sampling points per second per input, 4000 sampling points per second for 4 inputs in total, 2 bytes per sampling point, and 8000 bytes of collected data per second;

[0051] Fast data transmission speed: the 10 / 100M adaptive Ethernet transmission interface is used to achieve fast data transmission speed;

[0052] Convenient networking: the Ethernet transmission interface can set IP and port and work in a TCP server mode. Multiple acquisition devices can work in the same local area network, and the use of a switch can facilitate networking.

[0053] Embodiment 2

[0054] The application embodiment also provides a wiring example of the AC switch machine and the turnout representation pulse voltage rapid acquisition device of embodiment 1.

[0055] In the full electronic interlocking system in which the turnout indicating voltage is a pulse waveform, four routes of turnout indicating voltage need to be collected by each AC switch machine. Therefore, the fast collection device for each turnout indicating pulse voltage described in Embodiment 1 can be used for the collection of turnout indicating voltage of one AC switch machine.

[0056] Figure 3 The wiring diagram for the collection of turnout indicating voltage of one AC switch machine is shown, in which the turnout indicating voltage of each AC switch machine is four routes, i.e. the voltage of line 2, line 3, line 4 and line 5 to line 1.

[0057] It should be noted that, Figure 3 Only the collection of turnout indicating voltage wiring is shown on the wiring terminal of the distribution cabinet, actually the inside of the wiring terminal of the distribution cabinet is connected with the turnout control panel and the outside is connected with the switch machine, and the connection of the distribution cabinet with the turnout control panel and the switch machine is not embodied in order to simplify.

[0058] Embodiment 3

[0059] The present application also provides a wiring example of the DC switch machine and the fast collection device for each turnout indicating pulse voltage described in Embodiment 1.

[0060] In the full electronic interlocking system in which the turnout indicating voltage is a pulse waveform, two routes of turnout indicating voltage need to be collected by each DC switch machine. Therefore, the fast collection device for each turnout indicating pulse voltage described in Embodiment 1 can be used for the collection of turnout indicating voltage of two DC switch machines.

[0061] As Figure 4 The wiring diagram for the collection of turnout indicating voltage of two DC switch machines is shown, in which the turnout indicating voltage of each DC switch machine is two routes, i.e. the voltage of line 1 and line 2 to line 3, and the two DC switch machines are not associated in the diagram. Figure 4 Only the collection of turnout indicating voltage wiring is shown on the wiring terminal of the distribution cabinet, actually the inside of the wiring terminal of the distribution cabinet is connected with the turnout control panel and the outside is connected with the switch machine, and the connection of the distribution cabinet with the turnout control panel and the switch machine is not embodied in order to simplify.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application rather than limit the same; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific implementation of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, all of them should be covered in the technical solution range of the present application claimed for protection.

Claims

1. A device for rapidly acquiring turnout indication pulse voltage, characterized in that, It includes a voltage acquisition input interface, an opto-isolated amplifier circuit, a high-speed AD sampling circuit, an MCU controller, and an Ethernet transmission interface connected in sequence. The voltage acquisition input interface includes at least one input terminal, and each input terminal is connected to a resistor voltage divider sampling circuit. The opto-isolation amplifier circuit is connected to each resistor voltage divider sampling circuit, and is used to isolate and convert the pulse voltage signal collected by the resistor voltage divider sampling circuit. The high-speed AD sampling circuit is used to acquire the amplitude of the pulse voltage signal sent by the opto-isolated amplifier circuit at high speed. The MCU controller is used to send the amplitude of the pulse voltage signal acquired by the high-speed AD sampling circuit to the signal centralized monitoring station through the Ethernet transmission interface.

2. The turnout indication pulse voltage rapid acquisition device according to claim 1, characterized in that, The high-speed AD sampling circuit includes a single-ended differential conversion circuit, a bias and reference circuit, and a high-speed ADC sampling chip. The bias and reference circuit is used to provide a positive bias voltage signal or a negative bias voltage signal. The single-ended differential conversion circuit is used to convert the pulse voltage signal sent by the opto-isolated amplifier circuit into a differential signal based on the positive bias voltage signal or the negative bias voltage signal. The high-speed ADC sampling chip is used to convert the amplitude of the differential signal into an unsigned digital signal.

3. The turnout indication pulse voltage rapid acquisition device according to claim 1, characterized in that, The MCU controller is a microprocessor with a built-in high-speed AD converter, and the high-speed AD sampling circuit is a high-speed AD converter built into the MCU controller.

4. A turnout indication pulse voltage rapid acquisition device according to claim 1, 2, or 3, characterized in that, The opto-isolated amplifier circuit includes a linear optocoupler and an operational amplifier.

5. A turnout indication pulse voltage rapid acquisition device according to claim 4, characterized in that, The Ethernet transmission interface is a 10 / 100M adaptive Ethernet port.

6. The turnout indication pulse voltage rapid acquisition device according to claim 5, characterized in that, It also includes a DC power input interface, which is used to power the entire acquisition device.

7. A turnout indication pulse voltage rapid acquisition device according to claim 5, characterized in that, The turnout pulse voltage rapid acquisition device also includes an acquisition box, on the back of which is a guide rail mounting bracket. The input terminal and the Ethernet transmission interface are mounted on the front of the acquisition box, and the input terminal adopts a double-row plug-in terminal.

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