A data download system for traction converters of CRH2 platform EMUs

Abstract

This invention discloses a data download system for the traction converter of a CRH2 platform EMU, comprising an electro-optical signal conversion board and a photoelectric signal conversion and data processing board. The electro-optical signal conversion board is installed inside the DCU chassis and is communicatively connected to the SCP system control board. The photoelectric signal conversion and data processing board includes a power supply unit, a photoelectric signal conversion unit, a data processing unit, and a communication unit. Both the photoelectric signal conversion unit and the communication unit are connected to the data processing unit. The photoelectric signal conversion and data processing boards are located inside the MON chassis, and the power supply unit is connected to the DC24V power supply of the MON chassis backplane via a second backplane connector; alternatively, the photoelectric signal conversion and data processing boards can be integrated into a separate chassis. The electro-optical signal conversion board and the photoelectric signal conversion and data processing board are connected via a spare optical fiber communication link between the DCU chassis and the MON chassis. This invention has advantages such as safety, reliability, and flexible selection.

Description

Technical Field

[0001] This invention mainly relates to the field of CRH2 platform EMU technology, specifically to a CRH2 platform EMU traction converter data download system. Background Technology

[0002] The CRH2 platform EMU traction converter is a converter device that transforms high-voltage AC power into controllable power. It is a core component for key technologies such as starting acceleration, maximum braking distance, maximum maintainable operating speed, and operational stability of high-speed EMUs. When the traction converter malfunctions, the EMU loses power. This can range from simply cutting off the faulty carriage to limiting its speed, to requiring a complete stop and requesting assistance. Since the traction converter has fault diagnosis capabilities, fault data acquisition and processing are crucial aspects of fault diagnosis. Using a portable computer connected to the traction control unit via a serial port (Ethernet) to download fault data is an important way to obtain fault diagnosis information.

[0003] The existing CRH2 platform EMUs (CRH2A / 2C / 380A / 6A) utilize imported platform technology, and their overall design was finalized 20 years ago. They do not support downloading traction converter data (CI data) onboard (inside the carriages). Downloading CI data requires first removing the protective floor of the equipment compartment and opening components such as the traction converter cabinet door. This business model is inefficient, prone to problems such as parts falling off, and cannot obtain real-time CI operation data while the train is running.

[0004] To address the aforementioned technical issues, the patent applicant previously designed a data download device for the traction converter of the CRH2 platform EMU (patent application number 202323194377.9). However, in practical applications, the aforementioned download device lacks flexibility and is not very secure, posing a risk of data leakage. Summary of the Invention

[0005] To address the technical problems existing in the prior art, this invention provides a safe, reliable, and flexible CRH2 platform EMU traction converter data download system.

[0006] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0007] A data download system for the traction converter of a CRH2 platform EMU includes an electro-optical signal conversion board, an opto-optical signal conversion and data processing board; the electro-optical signal conversion board is installed in the DCU chassis under the EMU and is communicatively connected to the SCP system control board in the DCU chassis.

[0008] The photoelectric signal conversion and data processing board includes a power supply unit, a photoelectric signal conversion unit, a data processing unit, and a communication unit; the power supply unit is connected to the photoelectric signal conversion unit, the data processing unit, and the communication unit respectively, and is used to provide power to each unit; the photoelectric signal conversion unit and the communication unit are both connected to the data processing unit.

[0009] The photoelectric signal conversion and data processing boards are all located in the MON chassis inside the carriage. The power supply unit is connected to the DC24V power supply of the back panel of the MON chassis through the second back panel connector; or the photoelectric signal conversion and data processing boards are integrated into an independent chassis, and the power supply unit includes an independent power module.

[0010] The electro-optical signal conversion board and the photoelectric signal conversion and data processing board are connected via a backup optical fiber communication between the DCU chassis and the MON chassis.

[0011] Preferably, the independent power module includes a lithium battery, a power switch, and an isolated power module; the lithium battery is connected to the isolated power module via the power switch.

[0012] Preferably, the photoelectric signal conversion unit includes a third optical fiber interface and a third level conversion module. The third optical fiber interface is used to receive optical fiber signals and send them to the third level conversion module. The third level conversion module is used for waveform conditioning and sending the signals to the data processing unit.

[0013] Preferably, the communication unit includes a WiFi communication module and an Ethernet communication module; the WiFi communication module is equipped with an on / off switch.

[0014] Preferably, the electro-optic signal conversion board includes a first backplane connector, a DC / DC isolated power conversion module, a first optical fiber interface, a first level conversion module, an RS232 communication module, and an RS232 interface; the first backplane connector is connected to the DC / DC isolated power conversion module; the first optical fiber interface, the first level conversion module, the RS232 communication module, and the RS232 interface are connected in sequence.

[0015] Preferably, when the photoelectric signal conversion and data processing boards are all located in the MON chassis inside the carriage, the photoelectric signal conversion and data processing boards also include a Beidou positioning module, which is connected to the data processing unit.

[0016] Preferably, when the photoelectric signal conversion and data processing boards are both located in the MON chassis inside the carriage, the data processing unit is also connected to a communication baud rate mode selection switch for selecting the communication baud rate.

[0017] Preferably, when the photoelectric signal conversion and data processing boards are both located in the MON chassis inside the carriage, the data processing unit is also connected to a communication mode selection switch for selecting the communication mode.

[0018] Preferably, when the photoelectric signal conversion and data processing boards are both located in the MON chassis inside the carriage, the power supply unit adopts the DC24V power supply from the back panel of the MON chassis.

[0019] Preferably, the electro-optic signal conversion board is located in an unused board slot inside the DCU chassis and is connected to the SCP system control board via a serial port.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] This invention adopts modular components and a configuration-based design method to propose a solution that meets the reliability and safety requirements of high-speed train operation and maintenance. By configuring modular components, the solution is enriched, allowing for flexible selection of onboard solutions when the device is installed in batches. Modular configuration supports different customer needs.

[0022] This invention relates to a modularly configurable data download device system design: The CRH2 platform EMU traction converter data download device is designed using a modular configuration approach. Based on the structural characteristics of the CRH2 platform EMU, a solution combining off-board and on-board configurations is adopted, with the on-board configuration providing two optional configuration options:

[0023] The design and implementation of the vehicle-mounted electro-optical signal conversion board: The new electronic board is designed as an embedded board with safety features, using a chassis plug-in approach. Through power consumption analysis and power supply reliability design, the new board adopts a low-power and simplified design, with a single board rated power of only 1W. This ensures that the original vehicle power supply can be used to power the new board and realize the electro-optical signal conversion function without the need for an additional external power supply circuit. The electromagnetic interference signal of the new board is extremely low and will not affect the original vehicle power supply. Through embedded design and safety features, the design ensures that the new electronic board is compatible with the original vehicle system, safely and reliably realizes the intended function, and does not affect the original vehicle driving control.

[0024] The design and implementation of the vehicle-mounted optoelectronic signal conversion and data processing board: The newly added electronic board is designed as an embedded board with robust security features. Reliability design is enhanced, including power supply selection, board power safety design, and board functional safety design. The new board adopts a low-power design, with a single board rated power of less than 3W, ensuring that the original vehicle power supply can power the new board. Through a WiFi download function design combining hardware and software protection, a computer can connect to the data processing board via WiFi to safely and reliably download CI data without affecting the signal transmission of other devices, without impacting the normal operation and control of the vehicle, and preventing unrelated external devices from intruding and downloading data.

[0025] The design of the vehicle-mounted optical-electrical signal conversion fixture is as follows: It has its own power supply for flexible mobile use, ensuring that the new fixture is compatible with the original vehicle system, and safely and reliably realizes CI data download in both ETH and WiFi modes without affecting the original vehicle driving control. Attached Figure Description

[0026] Figure 1 This is a structural diagram of the CRH2 platform EMU traction converter data download system of the present invention in an embodiment.

[0027] Figure 2 This is a block diagram of the electro-optic signal conversion board in an embodiment of the present invention.

[0028] Figure 3 This is a block diagram of the photoelectric signal conversion and data processing board in an embodiment of the present invention (located inside the MON chassis).

[0029] Figure 4 This is an example diagram of the photoelectric signal conversion and data processing board of the present invention in a specific application (located inside the MON chassis).

[0030] Figure 5 This is a block diagram of the photoelectric signal conversion and data processing board in an embodiment of the present invention (located in a separate box). Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1 As shown, considering the operational and maintenance characteristics of rail transit vehicles and the service requirements of large-scale transport vehicles in specific environments, this invention adopts a modular configuration approach to design the traction converter data download system for CRH2 platform EMUs. Based on the structural characteristics of the CRH2 platform EMU, a solution combining under-vehicle and on-vehicle configurations is adopted. The on-vehicle configuration provides two optional configuration schemes, as detailed below. Figure 1 As shown.

[0033] In the undercarriage configuration, an electro-optical signal conversion board (or electro-optical signal conversion board) is added to the original traction converter drive control unit (DCU). The CI data in the SCP board (microcomputer control board) is obtained through the added serial cable, and after the electro-optical signal is converted to an optical signal, the data is transmitted to the vehicle through the backup optical fiber communication.

[0034] Regarding the vehicle's features (such as...) Figure 1 In configuration scheme 1), an optical-to-electrical signal conversion and data processing board is added to the network control terminal device (MON) in the equipment cabinet to convert the CI data transmitted from the backup optical fiber communication to the vehicle into an electrical signal and process it. The portable computer can download the CI data by connecting via Ethernet (ETH) or WiFi.

[0035] In another specific embodiment, for the in-vehicle configuration (such as...) Figure 1 In configuration scheme 2), when CI data needs to be downloaded, the newly developed optical-to-electrical signal conversion fixture is connected to the spare optical fiber in the equipment cabinet. The fixture realizes the conversion of optical signal to electrical signal, and the portable computer connects to the fixture via ETH / WiFi to download CI data.

[0036] This invention supports convenient and fast downloading of CI data on board (inside the carriage), and adds two new optional data download methods on the basis of the original data download.

[0037] like Figure 2 As shown, the electro-optical signal conversion board configured under the vehicle adopts a chassis plug-in board design. It obtains 5V power from the DCU chassis backplane through the first backplane connector on the plug-in board; the DC / DC isolation power conversion module converts it into 5V isolated power for use by the internal circuit of the plug-in board; the fiber optic signal is connected through the fiber optic interface (fiber optic transceiver). The signal is waveform conditioned by the level conversion chip (BUFFER) and then converted into an RS232 serial port signal by the RS232 communication module. It communicates with the transmission control chassis (SCP board) through the RS232 interface via a serial cable.

[0038] The aforementioned electro-optical signal conversion board utilizes an empty slot within the DCU for an embedded design, powering the newly added plug-in board via a backplane. The DCU's 5V power supply is designed to output 60W, with its existing load actually consuming approximately 40W (primarily powering the internal chips). The added plug-in board employs a simplified, low-power design, reducing its rated power to only 1W. After installation, the DCU's power load capacity remains ample, and experiments demonstrate that the DCU can operate normally without any impact.

[0039] The plug-in board panel is set with LED lights to display the status. A physical design example is shown in Table 1.

[0040] DCB board indicator definition

[0041]

[0042] like Figure 3 As shown, the photoelectric signal conversion and data processing board adopts a chassis plug-in board design. It obtains DC24V power from the MON backplane through the second backplane connector on the plug-in board; a toggle switch is set to independently control the on and off of the plug-in board's working power supply; and a DC / DC isolated power conversion module converts DC5V and 3.3V isolated power supplies for use by the internal circuitry of the plug-in board.

[0043] The fiber optic signal is received via a second fiber optic interface (fiber optic transceiver). This signal undergoes waveform conditioning via a level conversion chip (BUFFER) before being sent to the MCU microprocessor for data processing. Controlled by the MCU minimum system (such as RT1176 and FLASH / FRAM / SDRAM), the Ethernet communication module (ETH) converts the signal to an Ethernet signal, which then communicates with the portable computer via an Ethernet cable through an Ethernet interface (such as an M12 industrial Ethernet interface). Alternatively, a WiFi communication module can be configured on the plug-in board to convert the signal to a WiFi signal for wireless communication with the portable computer.

[0044] The aforementioned photoelectric signal conversion and data processing board utilizes an empty board slot within the MON chassis for an embedded design, powering the newly added plug-in board via a backplane. The MON's power board has a designed 24V output power of 40W, while its existing load actually consumes approximately 20W. The newly added plug-in board achieves low power consumption through simplified circuit design and the selection of low-power components, resulting in a rated power of only 2.5W. After installation, the MON's power load capacity still has ample margin, and experiments show that the MON can operate normally without any impact.

[0045] The 24V power supply from the chassis backplane was chosen instead of the 5V power supply on the backplane to avoid impacting critical loads (such as CPU chips) powered by the original chassis's 5V power supply. The 24V power supply also offers higher redundancy, as the original chassis's 24V power supply powers relays and other components, ensuring it will not be affected by interference. Regarding power safety design, after the 24V power supply enters the DPB data processing board, it is converted to 5V by an isolation power module with isolation, overload, and short-circuit protection functions to power the board. The 5V power supply is then converted to 3.3V by a DC / DC power chip to power the MCU microprocessor. Further protection measures include a selector switch (toggle switch) on the DPB data processing board, which powers the board only when CI data download is required. Normally, it is switched to the off state, completely de-energizing the DPB board, achieving zero power consumption and zero interference, without affecting the normal operation of the MON.

[0046] The plug-in board includes circuits for a serial-to-WiFi communication module and a Beidou positioning module, as well as a mode selection switch to enable switching and starting / stopping WiFi and Ethernet communication modes.

[0047] In addition, a communication baud rate mode selection switch is provided for selecting the communication baud rate. The communication rates are: RS232 serial communication, baud rate 9600 (for RP10 chassis), and baud rate 57600 (for RP20 chassis).

[0048] In addition, it is equipped with a Beidou positioning module, a 4G / 5G communication module, and FLASH and FRAM storage chips. Combined with vehicle positioning and time sequence (e.g., from the high-speed rail station back to the garage), it automatically downloads and caches the latest CI data to support subsequent data landing.

[0049] The toggle switch, LED lights, fiber optic and Ethernet interfaces are located on the panel of the plug-in board for easy viewing and operation.

[0050] The aforementioned reliability design for WiFi download functionality, employing a combination of hardware and software protection, enables portable computers to securely and reliably download CI data via WiFi connection to the data processing board. An example of a product implementing this solution is shown below. Figure 4 As shown.

[0051] Specifically, the hardware protection and reliability design includes:

[0052] Based on downloading CI data via Ethernet connection, a WiFi connection download function was designed and implemented to meet the operation and maintenance service needs of various user groups (with different permissions) in a large-scale transportation vehicle based on specific environments. To this end, two physical switches were designed for protection, enabling switching control between Ethernet and WiFi connection methods: 1. A selection switch (using a panel toggle switch, board toggle switch, etc.) was designed on the plug-in board panel; when the switch is in position 1, it is for Ethernet interface + WiFi download; in position 2, it is for Ethernet interface download; and in the OFF position, it is in power-off shutdown mode.

[0053] For scenarios where users do not need to use the WiFi download function, a selection switch (board switch) is set in the plug-in board to control the power-on of WiFi. This switch can cut off WiFi, realizing multi-layered security control for WiFi deployment.

[0054] The WiFi module uses a low-power, short-range signal transmission module with a short transmission distance and minimal electromagnetic interference, which has no impact on the original vehicle system. The MON with the added plug-in board is located in an aluminum alloy equipment cabinet, which can shield the WiFi signal. When the cabinet door is closed, the WiFi signal cannot be connected, and external unrelated devices cannot be detected.

[0055] Specifically, software protection and reliability design includes:

[0056] (1) When configuring WiFi, the SSID is configured to be hidden, so that external unrelated devices (such as mobile phones and computers) cannot find it using conventional methods.

[0057] (2) The WiFi is configured with a strong password, which provides a high level of security and is difficult to crack.

[0058] (3) Once an unrelated external device maliciously intrudes and connects to WiFi, it will be unable to download CI data due to the lack of dedicated software for CI data download and the limitations imposed by communication protocols, data formats, and checksums.

[0059] The above design achieves a safe and reliable WiFi download function, without affecting the signal transmission of other devices, without affecting the normal operation and control of the vehicle, and without the difficulty for external unrelated devices to intrude, connect, or download data.

[0060] The panel of the optoelectronic signal conversion and data processing board is equipped with LED lights to display the status. A physical design example is shown in Table 2.

[0061] Table 2 DPB Panel Lighting Definition

[0062]

[0063]

[0064] The above design ensures that the new electronic board is compatible with the original vehicle system, can safely and reliably achieve the intended functions, and does not affect the original vehicle driving control.

[0065] In another embodiment, such as Figure 5 As shown, the optoelectronic signal conversion fixture is powered by a lithium battery and an isolated power module, facilitating mobile use. It can be installed in an independent box or enclosure for easy movement. A toggle switch independently controls the power supply. Fiber optic signals are received via a third fiber optic interface (fiber optic transceiver). These signals undergo waveform conditioning via a level conversion chip (BUFFER) before being sent to the MCU chip for data processing. The Ethernet communication module then converts the signal into an Ethernet signal, which communicates with a portable computer via an Ethernet cable through an Ethernet interface (such as an M12 industrial Ethernet interface). The fixture can be configured with a WiFi communication module to convert the signal into a WiFi signal for wireless communication with a portable computer.

[0066] This invention employs modular components and a configurable design method, supporting convenient and rapid downloading of CI data on-board (inside the carriage). Building upon existing data download methods, it adds two new optional data download modes, meeting the reliability and safety requirements of high-speed train operation and maintenance, and achieving the following beneficial effects:

[0067] (1) System power consumption analysis and board power supply reliability design implementation ensure that the original vehicle power supply can be used to power the new board. The new board adopts low power consumption design and simplified design, and the power of each board is less than 3W. The electromagnetic interference signal is extremely small and will not affect the original vehicle power supply.

[0068] (2) By combining hardware and software protection in the WiFi download function design, the computer can connect to the data processing board via WiFi to download CI data safely and reliably without affecting the signal transmission of other devices, without affecting the normal operation and control of the vehicle, and external unrelated devices are difficult to intrude and connect to download data.

[0069] (3) The new electronic board is designed as a chassis plug-in board. It is implemented through embedded design and safety design to ensure compatibility with the original vehicle system, realize the predetermined functions safely and reliably, and not affect the original vehicle driving control.

[0070] (4) On-vehicle optical-electric signal conversion fixture design and implementation: It has its own power supply for flexible mobile use, ensuring that the new fixture is compatible with the original vehicle system, and safely and reliably realizes CI data download in both ETH and WiFi modes without affecting the original vehicle driving control.

[0071] This invention adopts modular components and a configuration-based design method to propose a solution that meets the reliability and safety requirements of high-speed train operation and maintenance. By configuring modular components, the solution is enriched, allowing for flexible selection of onboard solutions when the device is installed in batches. Modular configuration supports different customer needs.

[0072] This invention relates to a modularly configurable data download device system design: The CRH2 platform EMU traction converter data download device is designed using a modular configuration approach. Based on the structural characteristics of the CRH2 platform EMU, a solution combining off-board and on-board configurations is adopted, with the on-board configuration providing two optional configuration options:

[0073] The design and implementation of the vehicle-mounted electro-optical signal conversion board: The new electronic board is designed as an embedded board with safety features, using a chassis plug-in approach. Through power consumption analysis and power supply reliability design, the new board adopts a low-power and simplified design, with a single board rated power of only 1W. This ensures that the original vehicle power supply can be used to power the new board and realize the electro-optical signal conversion function without the need for an additional external power supply circuit. The electromagnetic interference signal of the new board is extremely low and will not affect the original vehicle power supply. Through embedded design and safety features, the design ensures that the new electronic board is compatible with the original vehicle system, safely and reliably realizes the intended function, and does not affect the original vehicle driving control.

[0074] The design and implementation of the vehicle-mounted optoelectronic signal conversion and data processing board: The newly added electronic board is designed as an embedded board with robust security features. Reliability design is enhanced, including power supply selection, board power safety design, and board functional safety design. The new board adopts a low-power design, with a single board rated power of less than 3W, ensuring that the original vehicle power supply can power the new board. Through a WiFi download function design combining hardware and software protection, a computer can connect to the data processing board via WiFi to safely and reliably download CI data without affecting the signal transmission of other devices, without impacting the normal operation and control of the vehicle, and preventing unrelated external devices from intruding and downloading data.

[0075] The design of the vehicle-mounted optical-electrical signal conversion fixture is as follows: It has its own power supply for flexible mobile use, ensuring that the new fixture is compatible with the original vehicle system, and safely and reliably realizes CI data download in both ETH and WiFi modes without affecting the original vehicle driving control.

[0076] Explanation of related names:

[0077] CI: In the CRH2 platform EMU, CI refers to the traction converter;

[0078] DCU (Drive Control Unit): Traction control unit, transmission control unit;

[0079] MON (MONITOR): Monitor; in the CRH2 platform EMU, MON refers to the vehicle information monitoring device; in this invention, MON refers to the network control terminal device.

[0080] ETH (Ethernet): Ethernet.

[0081] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A data download system for the traction converter of a CRH2 platform EMU, characterized in that, It includes an electro-optical signal conversion board, an optoelectronic signal conversion and data processing board; the electro-optical signal conversion board is installed in the DCU chassis under the EMU and is communicatively connected to the SCP system control board in the DCU chassis; The photoelectric signal conversion and data processing board includes a power supply unit, a photoelectric signal conversion unit, a data processing unit, and a communication unit; the power supply unit is connected to the photoelectric signal conversion unit, the data processing unit, and the communication unit respectively, and is used to provide power to each unit; the photoelectric signal conversion unit and the communication unit are both connected to the data processing unit. The photoelectric signal conversion and data processing boards are all located in the MON chassis inside the carriage. The power supply unit is connected to the DC24V power supply of the back panel of the MON chassis through the second back panel connector; or the photoelectric signal conversion and data processing boards are integrated into an independent chassis, and the power supply unit is an independent power module. The electro-optical signal conversion board and the photoelectric signal conversion and data processing board are connected via a backup optical fiber communication between the DCU chassis or the MON chassis.

2. The CRH2 platform EMU traction converter data download system according to claim 1, characterized in that, The independent power module includes a lithium battery, a power switch, and an isolated power module; the lithium battery is connected to the isolated power module via the power switch.

3. The CRH2 platform EMU traction converter data download system according to claim 2, characterized in that, The photoelectric signal conversion unit includes a third optical fiber interface and a third level conversion module. The third optical fiber interface is used to receive optical fiber signals and send them to the third level conversion module. The third level conversion module is used for waveform conditioning and sending the signals to the data processing unit.

4. The CRH2 platform EMU traction converter data download system according to claim 1, 2, or 3, characterized in that, The communication unit includes a WiFi communication module and an Ethernet communication module; the WiFi communication module is equipped with an on / off switch.

5. The CRH2 platform EMU traction converter data download system according to claim 1, 2, or 3, characterized in that, The electro-optic signal conversion board includes a first backplane connector, a DC / DC isolated power conversion module, a first optical fiber interface, a first level conversion module, an RS232 communication module, and an RS232 interface; the first backplane connector is connected to the DC / DC isolated power conversion module; the first optical fiber interface, the first level conversion module, the RS232 communication module, and the RS232 interface are connected in sequence.

6. The CRH2 platform EMU traction converter data download system according to claim 1, 2, or 3, characterized in that, When the photoelectric signal conversion and data processing board is located in the MON chassis inside the carriage, the photoelectric signal conversion and data processing board also includes a Beidou positioning module, which is connected to the data processing unit.

7. The CRH2 platform EMU traction converter data download system according to claim 1, 2, or 3, characterized in that, When the photoelectric signal conversion and data processing boards are both located in the MON chassis inside the carriage, the data processing unit is also connected to a communication baud rate mode selection switch for selecting the communication baud rate.

8. The CRH2 platform EMU traction converter data download system according to claim 1, 2, or 3, characterized in that, When the photoelectric signal conversion and data processing boards are both located in the MON chassis inside the carriage, the data processing unit is also connected to a communication mode selection switch for selecting the communication mode.

9. The CRH2 platform EMU traction converter data download system according to claim 1, 2, or 3, characterized in that, When the photoelectric signal conversion and data processing boards are located in the MON chassis inside the carriage, the power supply unit adopts the DC24V power supply from the back panel of the MON chassis.

10. The CRH2 platform EMU traction converter data download system according to claim 1, 2, or 3, characterized in that, The electro-optic signal conversion board is located in an unused slot inside the DCU chassis and is connected to the SCP system control board via a serial port.

Images