Railway station indoor and outdoor communication system and power line carrier communication board card

Abstract

The utility model relates to the technical field of railway traffic signals, in particular to a railway station indoor and outdoor communication system and a power line carrier communication board card. The communication system at least comprises at least one communication host arranged indoors and a plurality of communication extensions arranged outdoors; the communication extension sets are in cable connection with the communication host through the lightning protection branching cabinet; and the communication host and the communication extension are connected with the communication-power line through the power line carrier communication board card. The power line carrier communication board card at least comprises an MCU chip and a PLC chip which are in communication connection. The DC / DC converter is electrically connected with the MCU chip and the PLC chip respectively to supply power; and the PLC chip is connected with a communication-power line. When the track circuit is used for communication, signals are transmitted through direct current instead of 220V and 50Hz alternating current, so that the interference on the signals of the track circuit is avoided; in addition, the mounting capacity of a communication channel is improved through the mode that the PLC chip is connected with the communication-power line, and the communication efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of railway traffic signals, and relates to an indoor and outdoor communication system of a railway station and a power carrier communication board card. Background Art

[0002] There are a large number of track circuit equipment outdoors in railway stations, which are characterized by many types and complex configurations. They are prone to malfunctions during use, which affects the transportation order of the railway. In order to grasp its working status in real time, it is necessary to monitor the current, voltage and other working parameters of the outdoor track circuit equipment and transmit them back to indoor storage. However, indoor and outdoor communication cables in railway stations are in short supply, and the cost of re-laying cables is relatively high. At the same time, there is no power supply for track circuit monitoring equipment outdoors in the station. Therefore, the indoor and outdoor communication system of the railway station requires not only the use of less cable resources, but also the dual functions of communication and power supply. The existing indoor and outdoor communication systems of railway stations generally adopt power carrier communication to simultaneously complete the functions of communication and power supply on a two-core communication cable. The main problems are as follows:

[0003] 1) The power supply is 220V AC voltage, the frequency of which is 50Hz, which is close to the track signal frequency of 25Hz of the 25Hz phase-sensitive track circuit, and is likely to cause interference to the track circuit.

[0004] 2) One communication channel, that is, the number of outdoor monitoring devices that can be mounted on a 2-core communication cable is small, and the mounting capacity is relatively weak.

[0005] 3) There is interference between different communication channels, which affects communication efficiency. Utility Model Content

[0006] The purpose of the invention of the utility model is to provide an indoor and outdoor communication system for a railway station and a power carrier communication board card in view of the problems existing in the prior art such as easy interference to the track circuit and weak mounting capacity.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A railway station indoor and outdoor communication system. The communication system includes at least one communication host arranged indoors and several communication extensions arranged outdoors. The communication extension establishes a cable connection with the communication host through a lightning protection distribution cabinet. The communication host and the communication extension are connected to a communication-power line through a power carrier communication board. The power carrier communication board includes at least an MCU chip, a PLC chip and a DC / DC converter. The MCU chip is communicatively connected to the PLC chip. The DC / DC converter is electrically connected to the MCU chip and the PLC chip respectively to supply power. The PLC chip is connected to the communication-power line.

[0009] As a preferred solution of the utility model, the MCU chip is also connected to a power monitoring circuit, a program download circuit, a crystal oscillator circuit, a data storage circuit and a serial port circuit.

[0010] As a preferred solution of the present invention, the source monitoring circuit at least includes a first reset chip and a second reset chip. The first reset chip and the second reset chip are electrically connected.

[0011] As a preferred solution of the utility model, the program download circuit is a JTAG interface circuit.

[0012] As a preferred solution of the present invention, the crystal oscillator circuit includes at least a 20M crystal oscillator.

[0013] As a preferred solution of the present utility model, the data storage circuit at least includes an SRAM chip.

[0014] As a preferred solution of the utility model, the serial port circuit at least includes a serial port driver chip and a wiring terminal. The wiring terminal is electrically connected to the MCU chip through the serial port driver chip.

[0015] As a preferred solution of the utility model, the DC / DC converter is also electrically connected to the power monitoring circuit, the program download circuit, the crystal oscillator circuit, the data storage circuit and the serial port circuit respectively to provide power.

[0016] As a preferred solution of the utility model, the communication-power line adopts a double-core structure, that is, one cable includes two core wires insulated from each other.

[0017] The utility model also provides a power carrier communication board. The power carrier communication board at least includes an MCU chip, a PLC chip and a DC / DC converter. The MCU chip is connected to the PLC chip for communication. The DC / DC converter is electrically connected to the MCU chip and the PLC chip respectively for power supply. The PLC chip is connected to the communication-power line.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0019] 1. Signals are transmitted through direct current rather than 220V, 50Hz alternating current, thus eliminating interference with track circuit signals;

[0020] 2. Use PLC chip to connect communication-power line, which improves the mounting capacity of communication channel and improves communication efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 It is a schematic diagram of mounting between the communication extension and the communication channel of the utility model;

[0023] Figure 3 This is a schematic diagram of the connection relationship of each module of the power line carrier communication board of the utility model;

[0024] Figure 4 This is a schematic diagram of the MCU chip circuit of the utility model;

[0025] Figure 5 It is a circuit diagram of the PLC chip, serial port circuit, and data storage circuit of the utility model;

[0026] Figure 6 It is a circuit diagram of the power supply monitoring circuit, program downloading circuit and crystal oscillator circuit of the utility model;

[0027] Figure 7 It is a circuit diagram of the DC / DC converter of the utility model. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0029] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0031] In addition, the expressions “first”, “second”, “third”, etc. that appear in the terms are merely descriptions used to distinguish the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0032] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0033] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0034] Example 1

[0035] The present embodiment provides an indoor and outdoor communication system for a railway station. The communication system includes at least one communication host arranged indoors and several communication extensions arranged outdoors. The communication extension establishes a cable connection with the communication host through a lightning protection distribution cabinet. The communication host and the communication extension are connected to the communication-power line through a power carrier communication board. The power carrier communication board includes at least an MCU chip, a PLC chip and a DC / DC converter. The MCU chip is communicatively connected to the PLC chip. The DC / DC converter is electrically connected to the MCU chip and the PLC chip, respectively, to provide power. The PLC chip is connected to the communication-power line.

[0036] When the utility model is used for communication, the signal is transmitted through direct current rather than 220V, 50Hz alternating current, thereby eliminating interference with the track circuit signal; and the utility model improves the mounting capacity of the communication channel and improves the communication efficiency by connecting the communication-power line through the PLC chip.

[0037] Example 2

[0038] This embodiment is a further improvement of the embodiment 1, and the repeated contents are not repeated here. In this embodiment, the MCU chip is also connected to a power monitoring circuit, a program download circuit, a crystal oscillator circuit, a data storage circuit and a serial port circuit.

[0039] Preferably, the source monitoring circuit comprises at least a first reset chip and a second reset chip, wherein the first reset chip and the second reset chip are electrically connected.

[0040] Preferably, the program download circuit is a JTAG interface circuit.

[0041] Preferably, the crystal oscillator circuit includes at least a 20M crystal oscillator.

[0042] Preferably, the data storage circuit includes at least an SRAM chip.

[0043] Preferably, the serial port circuit at least includes a serial port driver chip and a wiring terminal. The wiring terminal is electrically connected to the MCU chip through the serial port driver chip.

[0044] Preferably, the DC / DC converter is also electrically connected to the power monitoring circuit, the program downloading circuit, the crystal oscillator circuit, the data storage circuit and the serial port circuit respectively to provide power supply.

[0045] Preferably, the communication-power line adopts a double-core structure, that is, one cable includes two core wires insulated from each other.

[0046] The utility model also provides a power carrier communication board. The power carrier communication board at least includes an MCU chip, a PLC chip and a DC / DC converter. The MCU chip is connected to the PLC chip for communication. The DC / DC converter is electrically connected to the MCU chip and the PLC chip respectively for power supply. The PLC chip is connected to the communication-power line.

[0047] Example 3

[0048] This embodiment provides an indoor and outdoor communication system for a railway station. Figure 1 The communication system provided in this embodiment may include at least one communication host arranged indoors and several communication extensions arranged outdoors. The communication extensions outdoors are connected to the communication host indoors through a lightning protection distribution cabinet.

[0049] The communication host adopts a box-type structure, and the communication host is equipped with a power carrier communication board and an AC-to-DC power supply module. The power carrier communication board can complete the modulation, demodulation, reception filtering, and communication protocol conversion of the power carrier signal (bidirectional conversion between power carrier and Modbus), and can convert the power carrier signal to an RS232 communication interface. The AC-to-DC power supply module is a switching power supply module with an input voltage of 50Hz / 220VAC, an output voltage of 110VDC, an output current of not less than 2A, and an output short-circuit protection function.

[0050] The lightning protection distribution cabinet is an interface cabinet for indoor and outdoor cables. It is equipped with wiring terminals to complete the transfer of indoor and outdoor communication-power lines. At the same time, a lightning protection module is set to achieve protection against outdoor lightning intrusion. The lightning protection distribution cabinet is an existing equipment for railway signals, providing wiring terminals for indoor to outdoor cables.

[0051] The communication-power line can use armored integrated sheath shielded cable. The communication-power line adopts a double-core structure, that is, one cable includes two insulated core wires. The material of the cable core wire is copper, with a cross-sectional area of ​​1mm2 and a DC resistance of no more than 100Ω for 1km.

[0052] The communication extension adopts a box-type structure with IP67 protection level. The communication extension is also equipped with a power carrier board to complete the modulation, demodulation, reception filtering, and communication protocol conversion of the power carrier signal (bidirectional conversion between power carrier and Modbus), and can convert the power carrier signal into an RS232 communication interface. Preferably, the communication extension adopts a standard 2U chassis with a communication circuit board and a DC power supply module installed inside.

[0053] See also Figure 2 , a communication-power line is a communication channel. The communication extension can complete the communication wiring by connecting the two core wires of the communication-power line. Preferably, several communication extensions can be connected in parallel on one communication channel.

[0054] Both the communication host and the communication extension are equipped with power carrier communication boards.

[0055] See also Figure 3 The power carrier board may include an MCU chip, a PLC chip, a serial port circuit, a power monitoring circuit, a program download circuit, a data storage circuit, a crystal oscillator circuit and a DC / DC converter.

[0056] The MCU chip is respectively connected to the PLC chip, the serial port circuit, the power monitoring circuit, the program downloading circuit, the data storage circuit, the crystal oscillator circuit and the DC / DC converter.

[0057] The DC / DC converter is also electrically connected to the PLC chip, the serial port circuit, the power monitoring circuit, the program downloading circuit, the data storage circuit and the crystal oscillator circuit respectively.

[0058] The MCU chip is used to control the sending and receiving of communication data and manage the received data. Figure 4 , the MCU chip can be TMS320F28377D.

[0059] The PLC chip is used to convert the signal transmitted by the MCU through the serial communication interface SCI into a power carrier signal, or convert the power carrier signal into an SCI signal, to achieve transparent transmission between the two communication methods. The PLC chip connects the communication-power line. Figure 5 , the PLC chip can be ES1667. The communication pin of the PLC chip is connected to the MCU chip. The two core wires of the communication-power line are connected to the SDA pin and SCL pin of the PLC chip respectively.

[0060] The power carrier signal is high-frequency information modulated on a 110V voltage signal, and the 110V power carrier signal is transmitted on the communication-power line.

[0061] The data storage circuit may include an SRAM chip. The SRAM chip is used to store data for the MCU chip to read and write at a faster speed to complete data processing. Figure 5 , the SRAM chip can be IS61WV51216.

[0062] The serial port circuit can include a serial port driver chip and a wiring terminal. The serial port driver chip is used to convert the MCU's serial communication interface SCI into RS232 level, which facilitates communication between the board and other boards. The wiring terminal is an RS232 connector, which is convenient for serial port communication wiring. Figure 5 The serial port driver chip may be MAX3232. The signal input port of MAX3232 is electrically connected to the MCU chip, and the signal output port of MAX3232 is connected to the wiring terminal.

[0063] The power monitoring circuit may include a first reset chip and a second reset chip. Figure 6, the first reset chip can be TPS3808G125, and the second reset chip can be TPS3808G33. The RESET pin of the first reset chip is connected to the MR pin of the second reset chip, and the RESET pin of the second reset chip is connected to the MCU chip. Regarding the first reset chip, its SENCE pin is connected to a 1.2V voltage, the CT pin and the MR pin are vacant, the GND pin is grounded, and the VDD pin is connected to a 3.3V voltage and grounded through a 0.1uF capacitor. Regarding the second reset chip, its GND pin is grounded and connected to its RESET pin through a 0.1uF capacitor. The RESET pin of the second reset chip is also connected to the VDD pin of the second reset chip through a 10K resistor. The RESET pin of the second reset chip is also connected to the SENCE pin of the second reset chip and connected to a 3.3V voltage. The SENCE pin of the second reset chip is also grounded through a 0.1uF capacitor. The CT pin of the second reset chip is grounded through a 1nF capacitor.

[0064] The first reset chip is used to monitor whether the 1.2V voltage is undervoltage. When the undervoltage condition exists, the first reset chip outputs a reset signal to the MR pin of the second reset chip, and the second reset chip outputs a reset signal to the MCU chip. The second reset chip is used to monitor whether the 3.3V voltage is undervoltage, and when the undervoltage condition exists, it outputs a reset signal to the MCU chip. The power monitoring circuit monitors the 1.2V and 3.3V voltages of the MCU chip through the first reset chip and the second reset chip.

[0065] See also Figure 6 The program download circuit may be a JTAG interface circuit. This embodiment uses a 14-pin JTAG interface. The JTAG interface may be used to download software code to the MCU chip or to implement online debugging.

[0066] See also Figure 6 , the crystal oscillator circuit may include a crystal oscillator chip and capacitors and resistors. The crystal oscillator chip is used to provide a clock for the MCU chip. The crystal oscillator chip may be a 20M crystal oscillator. The crystal oscillator chip may be an active crystal oscillator / 50MHz / OT2EL4C4JI-111OLP-50M.

[0067] The DC / DC converter converts DC5V to 3.3V and 1.2V power used by the MCU chip. DC5V can be the power output of the DC / DC module, with an input of 110VDC and an output of 5V. The model number can be UWTH1D05P-6WR3.

[0068] See also Figure 7, the DC / DC converter uses LM26420XMH. When configuring the relevant circuit of the DC / DC converter, the VINC pin is connected to the AGND pin through a 22uF capacitor. The AGND pin is connected to the EN2 pin through a 0.1uF capacitor. The AGND pin is grounded at the same time. The EN1 pin is connected to two VIND1s and connected to the PG1 pin through a 49.9K resistor. The EN1 pin is also connected to a 5V voltage. The EN1 pin is also grounded through a 22uF capacitor. The EN1 pin is also connected to the VINC pin through a 4.99 resistor. The SW1 pin is connected to a 3.3V voltage through a 2.2uH inductor. The two PGND1 pins are digitally grounded. The FB1 pin is grounded through a 10K resistor. The FB1 pin is also connected to a 3.3V voltage through a 31.6K resistor. A 1K resistor and an LED are connected in series, and then connected in parallel with two 22uF capacitors to connect 3.3V and the ground terminal, where the negative pole of the LED is grounded. The two DAP pins are grounded. The EN2 pin is connected to a 22K resistor. The end of the resistor connected to the EN2 pin that is not connected to the EN2 pin is also connected to the PG2 pin through a 49.9K resistor. The end of the resistor connected to the EN2 pin that is not connected to the EN2 pin is also connected to the two VIND2 pins. The two VIND2 pins are also connected to a 5V voltage. The end of the resistor connected to the EN2 pin that is not connected to the EN2 pin is also connected to ground through a 22uF capacitor. The SW2 pin is connected to a 1.2V voltage through a 2.2uH inductor. The two PGD2 pins are digitally grounded. The FB2 pin is grounded through a 10K resistor and is also connected to a 1.2V voltage through a 4.99K resistor. A 22uF capacitor and a 33uF capacitor are connected in parallel, and one end is connected to a 1.2V voltage and the other end is grounded.

[0069] The voltage output by the indoor communication host uses DC instead of 50Hz, thus eliminating interference with the track circuit signal (25Hz).

[0070] The DC voltage output by the indoor communication host is a relatively high 220V, and the outdoor communication extension adopts a low-power design, which effectively reduces the current on the cable channel, thereby reducing the voltage drop on the cable channel, ensuring that the voltage sent to the outdoor communication extension is within the input requirement range of its power module. In addition, the low-power design of the outdoor communication extension also provides the possibility of mounting more communication extensions on a single channel, otherwise the power supply will become a bottleneck for improving the mounting capacity.

[0071] The communication frequency band of the power carrier is designed to be multi-band adjustable. When in use, different frequency bands are used between different channels. The communication receiving device first filters the communication signal when receiving it, and only the configured frequency band signal can be transmitted.

[0072] In terms of communication efficiency, the utility model mainly improves the following aspects:

[0073] 1) The chip on the power carrier board has a main frequency of up to 800MHz, with fast computing speed, which reduces the time spent on conversion between the power carrier and Modbus protocol.

[0074] 2) The serial port baud rate of the RS232 interface is designed to be 115200bps to increase the speed of receiving and sending data between the communication system and the business system and reduce communication delay.

[0075] 3) The communication rate of the power carrier is designed to be no less than 150kbps.

[0076] Since the signal frequency transmitted on the channel of this communication system is relatively high, interference between channels is likely to occur, affecting communication efficiency. This embodiment has made improvements in the following aspects:

[0077] 1) Use shielded cable for channel cables and ground the shield layer at one end.

[0078] 2) The power carrier board can realize the configuration of no less than 5 frequency bands. When in use, different channels are configured as different frequency bands, and filtering is performed according to the frequency band during reception.

[0079] The low power consumption design of the communication extension is mainly reflected in the following aspects:

[0080] 1) When the communication extension is not communicating, it will actively enter the IDLE or STOP mode to reduce power consumption; when it needs to send data, it will wake up through an interrupt and exit the IDLE or STOP mode.

[0081] 2) When the communication extension sends data, turn off the receiving clock, and when receiving data, turn off the sending clock to reduce power consumption.

[0082] When the indoor and outdoor communication system of a railway station provided by this embodiment is used, the communication host performs polling according to the channel, and the communication extension on each channel uploads its own information after receiving the polling command.

[0083] Example 4

[0084] This embodiment provides a power carrier communication board card, which is used to implement the indoor and outdoor communication system of the railway station involved in Embodiment 1, Embodiment 2 and Embodiment 3. The power carrier communication board card may include an MCU chip, a PLC chip and a DC / DC converter. The MCU chip is connected to the PLC chip for communication. The DC / DC converter is electrically connected to the MCU chip and the PLC chip respectively for power supply. The PLC chip is connected to the communication-power line.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A railway station indoor and outdoor communication system, characterized in that: The communication system at least comprises at least one communication host arranged indoors and a plurality of communication extensions arranged outdoors; The communication extension establishes a cable connection with the communication host through the lightning protection distribution cabinet; The communication host and the communication extension are connected to the communication-power line via a power carrier communication board card; The power carrier communication board at least includes an MCU chip, a PLC chip and a DC / DC converter; The MCU chip is communicatively connected with the PLC chip; The DC / DC converter is electrically connected to the MCU chip and the PLC chip respectively to provide power; And the PLC chip is connected to the communication-power line.

2. The railway station indoor and outdoor communication system according to claim 1, characterized in that: The MCU chip is also connected to a power monitoring circuit, a program downloading circuit, a crystal oscillator circuit, a data storage circuit and a serial port circuit.

3. The railway station indoor and outdoor communication system according to claim 2, characterized in that: The source monitoring circuit at least includes a first reset chip and a second reset chip, and the first reset chip and the second reset chip are electrically connected.

4. The railway station indoor and outdoor communication system according to claim 2, characterized in that: The program download circuit is a JTAG interface circuit.

5. The railway station indoor and outdoor communication system according to claim 2, characterized in that: The crystal oscillator circuit includes at least a 20M crystal oscillator.

6. The railway station indoor and outdoor communication system according to claim 2, characterized in that: The data storage circuit includes at least an SRAM chip.

7. The railway station indoor and outdoor communication system according to claim 2, characterized in that: The serial port circuit at least includes a serial port driver chip and a connection terminal, and the connection terminal is electrically connected to the MCU chip through the serial port driver chip.

8. The railway station indoor and outdoor communication system according to claim 2, characterized in that: The DC / DC converter is also electrically connected to the power monitoring circuit, the program downloading circuit, the crystal oscillator circuit, the data storage circuit and the serial port circuit respectively to provide power.

9. The railway station indoor and outdoor communication system according to claim 1, characterized in that: The communication-power line adopts a double-core structure, that is, one cable includes two core wires insulated from each other.

10. A power line carrier communication board, characterized in that: The power carrier communication board at least includes an MCU chip, a PLC chip and a DC / DC converter; The MCU chip is communicatively connected with the PLC chip; The DC / DC converter is electrically connected to the MCU chip and the PLC chip respectively to provide power; And the PLC chip is connected to the communication-power line.

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