Flexible direct-current traction bidirectional converter control protection high-speed differential signal transmission module

Abstract

The utility model provides a flexible DC traction bidirectional converter control protection high-speed differential signal transmission module, which comprises a power supply module, a backboard data interface, an LVDS communication module, a differential signal driving module, an isolation protection module and an interface connection module, the backboard data interface is connected with at least one group of LVDS communication modules, the differential signal driving module is respectively connected with the LVDS communication modules and the isolation protection module, the isolation protection module is connected with the interface connection module, and the high-speed differential signal transmission module realizes data interaction with a flexible direct current traction system control module plate through the backboard data interface. According to the utility model, the power supply stability, the data transmission rate, the signal integrity, the interface connection reliability and the like are remarkably improved, the adaptive capacity of the flexible direct current traction system in a complex working environment and under the requirement of high performance is improved and enhanced, and higher reliability and flexibility are provided for users.

Description

Technical Field

[0001] The utility model belongs to the technical field of bidirectional converters of flexible DC traction power supply systems, and particularly relates to a control and protection high-speed differential signal transmission module for a flexible DC traction bidirectional converter. Background Art

[0002] The high-speed differential signal transmission module of the control and protection device of the flexible DC traction bidirectional converter is a key technology of the control and protection device of the flexible DC traction power supply system for urban rail transit. In the flexible DC traction power supply system, the control and protection device of the bidirectional converter needs to collect, process and transmit a large number of data signals in real time, and any signal distortion or delay may affect the normal operation of the flexible DC traction power supply system, and even lead to equipment failures or safety hazards. The communication transmission module of the traditional control and protection device of the flexible DC traction power supply system bidirectional converter faces a series of technical difficulties and problems, such as signal attenuation, insufficient anti-interference ability, limited data transmission rate, unstable interface connection, etc. In an electromagnetic interference environment, communication signals are extremely vulnerable to external noise, resulting in data distortion, thus affecting the signal integrity of the communication transmission module; the communication signal delay is large, increasing the risk of accidents; the interface connection is unstable, which may lead to communication interruption and affect the operation of the flexible DC traction power supply system; the environmental adaptability is poor, requiring the high-speed differential signal transmission module to be able to adapt to extreme temperature, humidity, vibration and other conditions.

[0003] In order to overcome the above problems, it is necessary to develop a new type of high-speed differential signal transmission module. The high-speed differential signal transmission module adopts advanced circuit design and signal processing technologies, solves problems such as signal attenuation, anti-interference, data transmission rate and interface stability, and provides a more stable, efficient and reliable data transmission solution for the flexible DC traction power supply system of modern rail transit. Summary of the Utility Model

[0004] In view of this, in order to overcome the above problems, the utility model proposes a control and protection high-speed differential signal transmission module for a flexible DC traction bidirectional converter, which optimizes signal integrity, reduces interference in data transmission, improves the reliability of interface connection, reduces the system failure rate, and thus realizes high-speed, stable and reliable data transmission of communication signals in the flexible DC traction system; in addition, the design of this module fully considers adapting to complex working environments and high-performance requirements, and provides higher reliability and flexibility for the flexible DC traction power supply system of modern rail transit.

[0005] To achieve the above object, the utility model is realized by the following technical solutions:

[0006] A high-speed differential signal transmission module for the control and protection of a flexible DC traction bidirectional converter, including a power supply module, a backplane data interface, an LVDS communication module, a differential signal driving module, an isolation protection module, and an interface connection module. The power supply module steps down the backplane supply voltage for powering each module in the circuit. The backplane data interface is connected to at least one group of the LVDS communication modules. The LVDS communication module is connected to the differential signal driving module, the differential signal driving module is connected to the isolation protection module, and the isolation protection module is connected to the interface connection module. This high-speed differential signal transmission module realizes data interaction with the control module board of the flexible DC traction system through the backplane data interface. The power supply module ensures stable and reliable system power supply. The LVDS communication module uses low-voltage differential signal transmission for processing high data rates to achieve high-speed data transmission, improving both the data transmission rate and bandwidth, as well as the performance of the flexible DC traction power supply system. The differential signal driving module uses differential transmission to ensure the integrity and stability of the signal during long-distance transmission. The differential signal driving module configures terminal matching resistors at both ends of the bus to optimize signal integrity and reduce reflection interference. The interface connection module provides a stable electrical connection.

[0007] Furthermore, the power supply module includes a power supply debugging port module, a backplane power supply interface module, a power input indicator light, a fuse tube, a pre-stage filtering circuit, a step-down module, a post-stage filtering circuit, and a power output indicator light. The backplane power supply interface module provides power input for the power supply module. The power supply debugging port module is used to implement the single-board power-on debugging test function, and can supply power to the power supply module separately when the backplane power supply interface module is not connected, facilitating the maintenance and debugging of the high-speed differential signal transmission module. The power input indicator light and the power output indicator light are used to monitor the working state of the power supply module. The power supply debugging port module and the backplane power supply interface module are respectively connected to the fuse tube. The fuse tube is connected to the pre-stage filtering circuit to form the pre-stage protection of the step-down module. The pre-stage filtering circuit is connected to the step-down module, and the step-down module is connected to the post-stage filtering module. The power input indicator light is respectively connected to the power supply debugging port module and the backplane power supply interface module, and the power output indicator light is connected to the post-stage filtering circuit.

[0008] Furthermore, the differential signal driving module includes an isolated DC-DC converter module and an RS-485 transceiver.

[0009] Furthermore, the differential signal driving module uses an isolated RS-485 transceiver to achieve high isolation between the signal and the power supply, enhancing the safety and anti-interference ability of the flexible DC traction power supply system.

[0010] Further, the isolation protection module includes a terminal matching resistor, a voltage stabilization module, and an isolation protection circuit. The terminal matching resistor is connected to one end of the differential signal driving module. The voltage stabilization module is connected between the terminal matching resistor and the isolation protection circuit. The voltage stabilization module uses a small-sized voltage stabilizing diode. The isolation protection circuit is provided with a transient voltage suppression diode array and a gas discharge tube.

[0011] Furthermore, the overall structure of the isolation protection module is as follows: The terminal matching resistor is arranged between two differential lines and between each differential line and the ground wire GND. The voltage stabilizing diode of the isolation protection module is connected in parallel with the terminal matching resistor. The transient voltage suppression diodes are respectively connected to the two differential lines between the voltage stabilizing diode and the gas discharge tube. One end of the gas discharge tube is connected to the ground wire GND, and the other two ends are respectively connected to the two differential lines.

[0012] Further, the interface connection module uses an aviation plug, providing a sturdy and durable connection method, improving the connection stability and anti-interference ability between the circuit and external devices, and being able to provide good electromagnetic shielding performance, reducing the influence of external interference on communication signals, thereby improving the stability and reliability of communication and being able to meet the usage requirements in harsh environments.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] The high-speed differential signal transmission module of the flexible DC traction bidirectional converter control and protection device of the present utility model provides significant improvements for the deficiencies of the prior art. By optimizing the circuit structure and the connection method between modules, comprehensive improvements in power supply stability, data transmission rate, signal integrity, and interface connection reliability are achieved: By improving the power supply module, a stable power supply is provided for the flexible DC traction power supply system to ensure the continuous operation of the entire transmission module; The communication module uses low-voltage differential signal transmission for processing high data rates, improving the data transmission rate and bandwidth; The differential signal driving module is provided with an isolated DC-DC converter module, realizing high isolation between signals and power supplies, enhancing the safety and anti-interference ability of the flexible DC traction power supply system; The interface connection module uses an aviation plug, providing a sturdy and durable connection method, improving the connection stability and anti-interference ability between the circuit and external devices, and being able to provide good electromagnetic shielding performance. In addition, the design of this module fully considers adapting to complex working environments and high-performance requirements, providing higher reliability and flexibility for the flexible DC traction power supply system of modern rail transit. Description of the Drawings

[0015] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are merely exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be derived based on the provided drawings.

[0016] Figure 1 Schematic diagram of the overall structure of the embodiment of the present invention;

[0017] Figure 2 Schematic diagram of the power supply module of the embodiment of the present invention;

[0018] Figure 3 Schematic diagram of the isolation protection module of the embodiment of the present invention.

[0019] Reference numerals in the figure: 1 - terminal matching resistor, 2 - zener diode, 3 - transient voltage suppression diode, 4 - gas discharge tube, 5 - differential line. Specific embodiments

[0020] The following will describe the exemplary embodiments of the present invention in more detail with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The following will describe the present invention in detail with reference to the drawings and in combination with the embodiments.

[0021] The present invention discloses an embodiment of a control protection high - speed differential signal transmission module for a flexible DC traction bidirectional converter, as Figure 1 shown, including a power supply module, a backplane data interface, an LVDS communication module, a differential signal driving module, an isolation protection module, and an interface connection module. The power supply module steps down the backplane supply voltage for powering each module in the circuit; the LVDS communication module is respectively connected to the differential signal driving module and the backplane data interface; the differential signal driving module is connected to the isolation protection module; the isolation protection module is connected to the interface connection module and is connected to external devices through the interface connection module; the backplane data interface is connected with multiple groups of LVDS communication modules; the high - speed differential signal transmission module realizes data interaction with the control module board of the flexible DC traction system through the backplane data interface.

[0022] As Figure 2As shown in the figure, the power module includes a power debugging port module, a backplane power supply interface module, a power input indicator light, a fuse, a pre-stage filtering circuit, a buck module, a post-stage filtering circuit, and a power output indicator light. The backplane power supply interface module provides power input for the power module; the power debugging port module is used to implement the power-on debugging test function of the single board, and can supply power to the power module independently when the backplane power supply interface module is not connected, which is convenient for the maintenance and debugging of the high-speed differential signal transmission module; the power input indicator light and the power output indicator light are used to monitor the working state of the power module; the power debugging port module and the backplane power supply interface module are respectively connected to the fuse, and the fuse is connected to the pre-stage filtering circuit to form the pre-stage protection of the buck module. The pre-stage filtering circuit is connected to the buck module, and the buck module is connected to the post-stage filtering module to achieve buck output; the power input indicator light is respectively connected to the power debugging port module and the backplane power supply interface module, and the power output indicator light is connected to the post-stage filtering circuit.

[0023] The differential signal driving module uses an isolated RE485 transceiver with a built-in isolated DC-DC converter module, which realizes high isolation between signals and power, enhances the safety and anti-interference ability of the flexible DC traction power supply system, and the RS-485 transceiver integrates an ESD protection function, which improves the stability and reliability of the circuit; ensures the integrity and stability of the signal during long-distance transmission.

[0024] The overall structure of the isolation protection module is as Figure 3 shown. The terminal matching resistor 1 is set between the two differential lines 5 and between each differential line 5 and the ground wire GND. The zener diode 2 of the isolation protection module is connected in parallel with the terminal matching resistor 1 to provide voltage stabilization protection for the circuit; two transient voltage suppression diodes 3 are respectively connected to the two differential lines 5, located between the zener diode 2 and the gas discharge tube 4. One end of the gas discharge tube 4 is connected to the ground wire GND, and the other two ends are respectively connected to the two differential lines 5. The isolation protection module uses transient voltage suppression diodes 3 and gas discharge tubes 4 for isolation overvoltage protection of the high-speed differential signal transmission module of the flexible DC traction bidirectional converter control protection device.

[0025] The interface connection module uses an aviation plug, which provides a sturdy and durable connection method, improves the connection stability and anti-interference ability between the circuit and external devices, and can provide good electromagnetic shielding performance, reducing the influence of external interference on communication signals, thereby improving the stability and reliability of communication, and can meet the usage requirements in harsh environments.

[0026] The backplane data interface and the LVDS communication module use low-voltage differential signal transmission. The LVDS communication module and the differential signal driving module use RXD (Receive Data) and TXD (Transmit Data) signals for transmission. The differential signal driving module and the isolation protection module, as well as the interface connection module, use 485 differential signals for transmission. The optimized circuit of the single-channel high-speed differential signal transmission module in the embodiment of the present utility model effectively combines the advantages of LVDS and RS-485 communication interfaces. LVDS is used to achieve the transmission of high-speed communication data, and the RS-485 communication interface is used to achieve long-distance communication and multi-point communication. The isolation protection module uses a transient voltage suppression diode array, a gas discharge tube, and a voltage stabilizing diode to protect the circuit from reverse voltage or overvoltage damage. The power supply debugging port module can implement the testability design function on the single board, and can supply power to the power supply module independently when the backplane power supply interface module is not connected. Generally speaking, the high-speed differential signal transmission module of the flexible DC traction bidirectional converter control and protection device of the present utility model adopts a modular design, making the circuit easier to maintain and upgrade. By optimizing the circuit structure and the connection method between modules, the comprehensive improvement of power supply stability, data transmission rate, signal integrity, and interface connection reliability is achieved.

[0027] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A flexible DC traction bidirectional converter control and protection high-speed differential signal transmission module, characterized in that: It includes a power supply module, a backplane data interface, an LVDS communication module, a differential signal driving module, an isolation protection module, and an interface connection module. The power supply module steps down the backplane power supply voltage for powering each module in the circuit. The backplane data interface is connected to at least one group of the LVDS communication modules. The LVDS communication module is connected to the differential signal driving module, the differential signal driving module is connected to the isolation protection module, and the isolation protection module is connected to the interface connection module. This high-speed differential signal transmission module realizes data interaction with the control module board of the flexible DC traction system through the backplane data interface.

2. The high-speed differential signal transmission module for controlling and protecting a flexible DC traction bidirectional converter according to claim 1, characterized in that: The power supply module includes a power supply debugging port module, a backplane power supply interface module, a power input indicator light, a fuse tube, a pre-stage filtering circuit, a step-down module, a post-stage filtering circuit, and a power output indicator light. The backplane power supply interface module provides power input for the power supply module. The power supply debugging port module is used to implement the single-board power-on debugging and testing function, and can supply power to the power supply module independently when the backplane power supply interface module is not connected. The power input indicator light and the power output indicator light are used to monitor the working state of the power supply module. The power supply debugging port module and the backplane power supply interface module are respectively connected to the fuse tube. The fuse tube is connected to the pre-stage filtering circuit to form the pre-stage protection of the step-down module. The pre-stage filtering circuit is connected to the step-down module, the step-down module is connected to the post-stage filtering module. The power input indicator light is respectively connected to the power supply debugging port module and the backplane power supply interface module, and the power output indicator light is connected to the post-stage filtering circuit.

3. A flexible DC traction bidirectional converter control and protection high-speed differential signal transmission module according to claim 1, characterized in that: The differential signal driving module includes an isolated DC-DC converter module and an RS-485 transceiver.

4. A flexible DC traction bidirectional converter control and protection high-speed differential signal transmission module according to claim 1, characterized in that: The differential signal driving module uses an isolated RS-485 transceiver.

5. A flexible DC traction bidirectional converter control and protection high-speed differential signal transmission module according to claim 1, characterized in that: The isolation protection module includes a terminal matching resistor, a voltage stabilizing module, and an isolation protection circuit. The terminal matching resistor is connected to one end of the differential signal driving module. The voltage stabilizing module is respectively connected between the terminal matching resistor and the isolation protection circuit. The voltage stabilizing module uses a small-sized voltage stabilizing diode. The isolation protection circuit is provided with a transient voltage suppression diode array and a gas discharge tube.

6. The high-speed differential signal transmission module for controlling and protecting a flexible DC traction bidirectional converter according to claim 5, characterized in that: The overall structure of the isolation protection module is as follows: The terminal matching resistor is arranged between two differential lines and between each differential line and the ground wire GND. The voltage stabilizing diode of the isolation protection module is connected in parallel with the terminal matching resistor. The transient voltage suppression diodes are respectively connected to the two differential lines between the voltage stabilizing diode and the gas discharge tube. One end of the gas discharge tube is connected to the ground wire GND, and the other two ends are respectively connected to the two differential lines.

7. A flexible DC traction bidirectional converter control and protection high-speed differential signal transmission module according to claim 1, characterized in that: The interface connection module uses an aviation plug.

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