traction inverter

Abstract

The present application relates to the technical field of traction converter, and particularly relates to a traction converter, which comprises a control unit, a power unit and an optical cable assembly, the optical cable assembly comprises a plurality of connector assemblies and a plurality of optical fibers, the plurality of connector assemblies are connected with the control unit and the power unit respectively, the connector assembly comprises a first shell, a circuit board and a plurality of optical modules, the circuit board is arranged in the first shell, the plurality of optical modules are arranged on two sides of the circuit board respectively, the plurality of optical modules on the two sides of the circuit board are arranged alternately, and the plurality of optical modules are connected with the plurality of optical fibers respectively. The optical cable assembly adopts the optical fiber as the transmission medium, and utilizes the structure that the optical modules in the connector assembly are arranged alternately on the two sides of the circuit board, so that the technical effects of high-fidelity transmission of signals, simplification of system architecture and miniaturization of the connector assembly are realized.

Description

Technical Field

[0001] This invention relates to the field of traction converter technology, and more specifically, to a traction converter. Background Technology

[0002] Currently, in rail transit traction converter systems, high-speed and reliable signal transmission between the control unit and the power unit is the core component ensuring the safe and stable operation of the converter. As converters develop towards higher switching frequencies, higher power densities, and miniaturization, the cabinet experiences extremely strong electromagnetic interference, high and low voltage shared cavities, compact installation space, and harsh vibration environments, placing extremely high demands on the interconnection and transmission system.

[0003] In related technologies, traditional shielded copper cables are used to interconnect signals between the control unit and the power unit. Copper cables use electrical signals as the transmission carrier and rely on a metal shielding layer to reduce interference, making them the mainstream connection method for traction converters. However, copper cables do not have electrical isolation capabilities, requiring additional isolation circuits, isolation power supplies, and other components, which leads to system complexity, large size, and an increase in potential failure points. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] Therefore, a first aspect of the present invention provides a traction converter.

[0006] In view of the above, a first aspect of the present invention provides a traction converter, including a control unit, a power unit, and an optical cable assembly. The optical cable assembly includes multiple connector assemblies and multiple optical fibers. The multiple connector assemblies are respectively connected to the control unit and the power unit. The connector assembly includes a first housing, a circuit board, and multiple optical modules. The circuit board is disposed in the first housing. The multiple optical modules are respectively arranged on both sides of the circuit board, and the multiple optical modules located on both sides of the circuit board are arranged alternately. The multiple optical modules are respectively connected to the multiple optical fibers.

[0007] Optionally, in some technical solutions of the present invention, the connector assembly further includes a connector disposed on one side of the first housing. The circuit board includes a first rigid part, a flexible part, and a second rigid part. The first rigid part is mounted on the first housing, and the optical module is disposed on the first rigid part. One side of the flexible part is connected to the first rigid part. The second rigid part is connected to the other side of the flexible part and is electrically connected to the connector.

[0008] In some technical solutions of the present invention, the circuit board may optionally be an integral structure.

[0009] In some technical solutions of the present invention, optionally, the optical module includes a second housing, a laser, a detector, a first pin, and a second pin; the laser is disposed in the second housing and electrically connected to a first rigid part; the detector is disposed in the second housing and electrically connected to the first rigid part; the first pin is connected to one of a plurality of optical fibers, and the end of the first pin is coupled to the optical surface of the laser; the second pin is connected to another of the plurality of optical fibers, and the end of the second pin is coupled to the optical surface of the detector.

[0010] In some technical solutions of the present invention, optionally, the second housing includes a second body, a second cover, and a second connector; the second body is provided with a second mounting cavity, and the laser, detector, first pin, and second pin are located in the second mounting cavity; the second cover is provided on the opening side of the second mounting cavity; the second connector passes through the second body and the second cover for fixing the second body and the second cover.

[0011] In some technical solutions of the present invention, optionally, the first housing includes a first body, a first cover and a first connector; the first body is provided with a first mounting cavity, and the circuit board and multiple optical modules are disposed in the first mounting cavity; the first cover is disposed on the opening side of the first mounting cavity; the first connector passes through the first cover and the first body for fixing the first cover and the first body.

[0012] Optionally, in some technical solutions of the present invention, the traction converter further includes a wire guide sleeve, which is sandwiched between the first body and the first cover, located on the side of the first body away from the connector. The wire guide sleeve is provided with multiple wire holes and multiple slots, the multiple slots are respectively connected to the multiple wire holes, and the slots extend from the wire holes to the edge of the wire guide sleeve. Multiple optical fibers are inserted into the wire holes.

[0013] In some technical solutions of the present invention, optionally, the diameter of the through hole is smaller than the diameter of the optical fiber.

[0014] In some technical solutions of the present invention, optionally, a plurality of protrusions are provided on the inner side of the first cover, and the plurality of protrusions abut against the optical module.

[0015] In some technical solutions of the present invention, optionally, there are multiple power units, and the multiple connector assemblies include a first connector assembly, a second connector assembly, and a third connector assembly; the first connector assembly is connected to the control unit; the second connector assembly is connected to one of the multiple power units, and the optical module of the second connector assembly is connected to a portion of the multiple optical modules of the first connector assembly via optical fiber; the third connector assembly is connected to another power unit among the multiple power units, and the optical module of the third connector assembly is connected to another portion of the multiple optical modules of the first connector assembly via optical fiber.

[0016] The traction converter provided by this invention uses optical fiber as the transmission medium and utilizes the structure of optical modules in the connector assembly arranged alternately on both sides of the circuit board. This solves the technical problems of signal distortion in strong electromagnetic interference environment, system complexity caused by the need for additional isolation circuits, and insufficient installation space in the cabinet. As a result, it achieves the technical effects of high-fidelity signal transmission, simplified system architecture, and miniaturization of connector assembly.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 One of the exploded views of a connector assembly according to an embodiment of the present invention; Figure 2 This is a second exploded view of the connector assembly according to an embodiment of the present invention; Figure 3 This is one of the connection diagrams of an optical cable assembly according to an embodiment of the present invention; Figure 4 An exploded view of the structure of an optical module according to an embodiment of the present invention; Figure 5 This is one of the structural schematic diagrams of a cable guide sleeve according to an embodiment of the present invention; Figure 6 This is a second schematic diagram of the structure of the cable guide sleeve according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a first body according to an embodiment of the present invention; Figure 8 This is a second schematic diagram of the connection of an optical cable assembly according to an embodiment of the present invention.

[0019] Figure label: 100 Control unit, 200 Power unit, 300 Optical cable assembly, 400 Connector assembly, 410 First housing, 412 First body, 414 First cover, 416 First connector, 418 Protrusion, 420 Circuit board, 422 First rigid part, 424 Flexible part, 426 Second rigid part, 430 Optical module, 432 Second housing, 434 Laser, 436 Detector, 438 First pin, 439 Second pin, 440 Connector, 452 Second body, 454 Second cover, 456 Second connector, 460 First connector assembly, 470 Second connector assembly, 480 Third connector assembly, 500 Optical fiber, 600 Cable guide sleeve, 610 Cable guide hole, 620 Slot. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0022] The following reference Figures 1 to 8 A traction converter according to some embodiments of the present invention is described.

[0023] In one embodiment of the present invention, such as Figure 1 , Figure 2 and Figure 3 As shown, a traction converter is provided, including a control unit 100, a power unit 200, and an optical cable assembly 300. The optical cable assembly 300 includes multiple connector assemblies 400 and multiple optical fibers 500. The multiple connector assemblies 400 are respectively connected to the control unit 100 and the power unit 200. The connector assembly 400 includes a first housing 410, a circuit board 420, and multiple optical modules 430. The circuit board 420 is disposed inside the first housing 410. The multiple optical modules 430 are respectively arranged on both sides of the circuit board 420, and the multiple optical modules 430 on both sides of the circuit board 420 are arranged alternately. The multiple optical modules 430 are respectively connected to the multiple optical fibers 500.

[0024] In this embodiment, the optical cable assembly 300 is used to realize signal transmission between the control unit 100 and the power unit 200. The optical cable assembly 300 includes multiple connector assemblies 400 and multiple optical fibers 500. The multiple connector assemblies 400 are respectively connected to the control unit 100 and the power unit 200. Each connector assembly 400 includes a first housing 410, a circuit board 420, and multiple optical modules 430. The first housing 410 forms an external protective structure for the connector assembly 400. The circuit board 420 is disposed inside the first housing 410. The circuit board 420 has a first surface and a second surface opposite to the first surface. A portion of the multiple optical modules 430 are disposed on the first surface of the circuit board 420. Another portion of the multiple optical modules 430 are disposed on the second surface of the circuit board 420. Along the length direction of the circuit board 420, the optical modules 430 located on the first surface and the optical modules 430 located on the second surface are arranged alternately. In other words, along the length of the circuit board 420, any optical module 430 located on the first surface and its adjacent optical module 430 located on the second surface are not at the same horizontal coordinate position, but are offset from each other. Each optical module 430 is connected to an optical fiber 500. Multiple optical modules 430 work together to achieve the conversion between electrical signals and optical signals, as well as the conversion between optical signals and electrical signals. Multiple optical fibers 500 extend from the inside of the first housing 410 to the outside of the first housing 410 for transmitting optical signals.

[0025] Based on this, the operation of the connector assembly 400 in the traction converter is as follows: The electrical signal generated by the control unit 100 is transmitted to the corresponding optical module 430 through the circuit board 420 in the connector assembly 400 to which the control unit 100 is connected. The optical module 430 converts the electrical signal into an optical signal. The optical signal is transmitted via the optical fiber 500 connected to the optical module 430 to the optical module 430 in the connector assembly 400 to which the power unit 200 is connected. The optical module 430 in the connector assembly 400 on the power unit 200 side converts the received optical signal into an electrical signal. This electrical signal is transmitted to the power unit 200 through the circuit board 420, thereby realizing the transmission of control signals from the control unit 100 to the power unit 200. Similarly, the signal fed back from the power unit 200 to the control unit 100 is also transmitted in reverse through the same optical signal transmission path.

[0026] When the traction converter is in operation, its internal power devices generate a strong electromagnetic field. This strong electromagnetic field creates a strong electromagnetic interference environment within the traction converter cabinet. Since the optical fiber 500 is made of an insulating dielectric material (such as quartz glass or plastic), it is unaffected by external electromagnetic fields when transmitting optical signals. Therefore, the optical signal maintains its original amplitude and phase during transmission within the optical fiber 500, and will not experience bit errors or jitter due to electromagnetic interference. Thus, the optical cable assembly 300 achieves distortion-free, low-latency signal transmission between the control unit 100 and the power unit 200 in the strong electromagnetic interference environment of the traction converter, fundamentally avoiding the signal instability problems caused by electromagnetic interference in traditional electrical signal transmission methods.

[0027] Furthermore, since the optical fiber 500 serves as the transmission medium and is physically constructed of non-conductive materials, electrical isolation is achieved between the control unit 100 and the power unit 200 connected by the connector assembly 400 via the optical fiber 500. There is no direct electrical conduction path between the control unit 100 and the power unit 200. In the high- and low-voltage common-cavity layout of the traction converter, the low-voltage circuit on the control unit 100 side and the high-voltage circuit on the power unit 200 side are physically insulated from each other via the optical fiber 500, eliminating the need for additional active isolation devices such as isolation transformers or isolation optocouplers. This simplifies the internal circuit structure of the traction converter and avoids the risk of voltage breakdown or short circuits due to isolation device failure, thereby improving the overall electrical safety of the traction converter.

[0028] Furthermore, in the thickness direction of the circuit board 420, multiple optical modules 430 located on the first surface occupy a first spatial region, and multiple optical modules 430 located on the second surface occupy a second spatial region. Since the first and second spatial regions are located on opposite sides of the circuit board 420, this structure does not add extra dimensions in the width direction of the circuit board 420 compared to arranging all optical modules 430 on the same side of the circuit board 420. Simultaneously, by staggering the optical modules 430 located on both sides in the length direction of the circuit board 420, the spacing between adjacent optical modules 430 is increased. When N optical modules 430 need to be arranged, this structure allows only approximately N / 2 optical modules 430 to be accommodated in the length direction of the circuit board 420, thereby shortening the overall length of the circuit board 420. The reduction in the length of the circuit board 420 directly results in a reduction in the length dimension of the first housing 410. Under the condition of compact installation space within the traction converter cabinet, this reduced-size connector assembly 400 can be arranged more flexibly within the cabinet and avoids interference with other components. Meanwhile, the reduced weight of the connector assembly 400 decreases the dynamic load on the mounting interface under vibration conditions, thereby improving the vibration resistance reliability of the connector assembly 400 during operation of rail transit vehicles.

[0029] As can be seen, by using optical fiber 500 as the transmission medium and utilizing the structure of the optical module 430 in the connector assembly 400 arranged alternately on both sides of the circuit board 420, the optical cable assembly 300 solves the technical problems of signal distortion in the traction converter under strong electromagnetic interference environment, the need for additional isolation circuit leading to system complexity, and insufficient installation space in the cabinet. Thus, it achieves the technical effects of high-fidelity signal transmission, simplified system architecture, and miniaturization of the connector assembly 400.

[0030] This embodiment provides a traction converter, which, in addition to the technical features of the above embodiments, further includes the following technical features.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, the connector assembly 400 also includes a connector 440, which is disposed on one side of the first housing 410. The circuit board 420 includes a first rigid part 422, a flexible part 424, and a second rigid part 426. The first rigid part 422 is mounted on the first housing 410, and the optical module 430 is disposed on the first rigid part 422. One side of the flexible part 424 is connected to the first rigid part 422. The second rigid part 426 is connected to the other side of the flexible part 424 and is electrically connected to the connector 440.

[0032] In this embodiment, the circuit board 420 includes a first rigid portion 422, a flexible portion 424, and a second rigid portion 426. The first rigid portion 422 is mounted on the first housing 410. The optical module 430 is disposed on the first rigid portion 422. One side of the flexible portion 424 is connected to the first rigid portion 422. The second rigid portion 426 is connected to the other side of the flexible portion 424. The second rigid portion 426 is electrically connected to the connector 440. The first rigid portion 422, the flexible portion 424, and the second rigid portion 426 constitute a rigid-flexible-rigid integrated structure. The first rigid portion 422 has a first surface and a second surface, which are used to provide a rigid mounting base for the optical module 430, ensuring the positional stability of the optical module 430 in a vibration environment. The second rigid portion 426 is used to weld or crimp to the conductive terminals of the connector 440 to achieve electrical conduction between the circuit board 420 and the connector 440. The flexible part 424 is composed of a bendable insulating substrate and conductive lines embedded therein, which is used to realize the electrical connection between the first rigid part 422 and the second rigid part 426, and to allow changes in the relative position or angle between the first rigid part 422 and the second rigid part 426.

[0033] In the assembled state of the connector assembly 400, a receiving space is formed inside the first housing 410. A first rigid portion 422 is located within this receiving space and is fixed to the inner wall of the first housing 410 by screws or a snap-fit ​​structure. A first end of a flexible portion 424 is fixedly connected to the edge of the first rigid portion 422, and a second end of the flexible portion 424 is fixedly connected to the edge of a second rigid portion 426. After the second rigid portion 426 is electrically connected to the connector 440, the connector 440 is fixed to one side wall of the first housing 410.

[0034] When the connector assembly 400 needs to be installed in a bent configuration inside the traction converter cabinet, the first housing 410 typically extends along the depth of the cabinet. The connector 440 is located at the rear end of the first housing 410 and is used to mate with a socket on the cabinet back panel. The optical module 430 is mounted on the first rigid part 422 and is arranged facing the interior space of the cabinet. Due to the limited interior space of the cabinet, the first rigid part 422 and the connector 440 are not on the same horizontal plane or the same axial direction. In this scenario, the flexible part 424 is bent to a predetermined angle during assembly, allowing the second rigid part 426 to bend at a predetermined angle relative to the first rigid part 422, thereby adapting to the installation orientation of the connector 440 on the side of the housing. Through the bending of the flexible part 424, the second rigid part 426 moves the connector 440 to the predetermined position for mating with the cabinet socket. Because the conductive lines within the flexible portion 424 form a continuous electrical signal transmission path between the first rigid portion 422 and the second rigid portion 426, the electrical signals input by the control unit 100 or the power unit 200 via the connector 440 are transmitted sequentially through the second rigid portion 426, the conductive lines within the flexible portion 424, and the first rigid portion 422 to the optical module 430. During this transmission process, the flexible portion 424 can absorb the assembly stress caused by the machining tolerances of the first housing 410 and the installation position deviation of the connector 440, ensuring that the optical module 430 on the first rigid portion 422 is not affected by the positional offset of the second rigid portion 426 and the connector 440, and always maintains the optical path alignment accuracy between the optical fiber 500 ferrule corresponding to the optical module 430.

[0035] During the operation of the traction converter, the traction converter cabinet will experience continuous mechanical vibration due to vehicle vibration. If the circuit board 420 is a single rigid plate, this rigid plate must simultaneously bear the load of the optical module 430 and the insertion and extraction force of the connector 440 terminals. The vibration energy will be directly transmitted through the rigid plate to the interface between the optical module 430 and the fiber optic 500 pin, which can easily lead to optical path misalignment or cracking of the solder joints of the optical module 430. In this structure, the flexible part 424 forms a flexible force isolation section between the first rigid part 422 and the second rigid part 426. When the vibration energy is transmitted from the connector 440 to the second rigid part 426, a portion of the vibration energy is absorbed and attenuated by the bendable substrate of the flexible part 424, and the amplitude and frequency of the remaining portion are significantly reduced when transmitted to the first rigid part 422. In this way, the peak vibration acceleration experienced by the optical module 430 on the first rigid part 422 is less than the peak vibration acceleration experienced by the second rigid part 426, thereby reducing the risk of optical module 430 experiencing optical path mismatch due to vibration.

[0036] Furthermore, during long-term use of the connector assembly 400, the conductive terminals of the connector 440 may experience slight deformation or positional shift due to repeated insertion and removal. When the stress generated by this deformation or shift is transmitted to the flexible portion 424 through the second rigid portion 426, the flexible portion 424 undergoes adaptive deformation through its own elastic bending, dissipating the stress during the flexing process of the flexible portion 424, thereby preventing the stress from being transmitted along the first rigid portion 422 to the mounting area of ​​the optical module 430. This ensures the stability of the optical interface between the optical module 430 and the fiber optic 500 ferrule, avoiding loosening or optical path misalignment caused by the insertion and removal of the connector 440.

[0037] It can be seen that the circuit board 420 adopts a rigid-flexible-rigid integrated structure composed of a first rigid part 422, a flexible part 424, and a second rigid part 426. By utilizing the bending adaptation function and stress isolation function of the flexible part 424 between the first rigid part 422 and the second rigid part 426, the technical problems of optical path misalignment of the optical module 430 and stress transmission of connector 440 caused by assembly tolerance and vibration environment in the bending installation scenario are solved. Thus, the technical effects of flexible bending installation of connector assembly 400 in compact cabinet, stable optical path transmission under vibration conditions, and reliable signal transmission after long-term insertion and removal of connector 440 are achieved.

[0038] This embodiment provides a traction converter, which, in addition to the technical features of the above embodiments, further includes the following technical features.

[0039] like Figure 1 and Figure 2 As shown, circuit board 420 is an integrated structure.

[0040] In this embodiment, the first rigid portion 422, the flexible portion 424, and the second rigid portion 426 are continuously formed using the same processing technology to constitute an inseparable integral circuit board 420. There is no separable connection structure formed by subsequent assembly processes at the interface between the first rigid portion 422, the flexible portion 424, and the second rigid portion 426. During the manufacturing process of the circuit board 420, the rigid substrate of the first rigid portion 422 and the rigid substrate of the second rigid portion 426 are integrally formed in a pressing or laminating process using the flexible substrate of the flexible portion 424. The conductive circuit layer of the flexible portion 424 is continuously formed in the same processing step with the conductive circuit layers of the first rigid portion 422 and the second rigid portion 426, forming a continuous electrical signal transmission path. A first conductive circuit is arranged inside the first rigid portion 422. A second conductive circuit is arranged inside the second rigid portion 426. A third conductive circuit is arranged inside the flexible portion 424. One end of the first conductive circuit is electrically connected to the pin of the optical module 430. The other end of the first conductive line and one end of the third conductive line are continuously connected at the interface between the flexible part 424 and the first rigid part 422, without any solder joints or contact terminals. One end of the second conductive line is electrically connected to the conductive terminal of the connector 440. The other end of the second conductive line and the other end of the third conductive line are continuously connected at the interface between the flexible part 424 and the second rigid part 426, also without any solder joints or contact terminals.

[0041] During the assembly of connector assembly 400, the operator places the first rigid part 422 on the mounting platform inside the first housing 410 and secures the first rigid part 422 to the first housing 410 using fasteners. The operator then bends the second rigid part 426 relative to the first rigid part 422 to a predetermined angle, bringing the connector 440 to the position for mating with the external socket. Since the circuit board 420 is a single unit, the operator does not need to perform alignment adjustments or soldering between the first rigid part 422 and the second rigid part 426 when bending the flexible part 424. After bending, the relative position between the first rigid part 422 and the second rigid part 426 is locked, eliminating the need for additional connector 440 or solder joints to maintain electrical conductivity between them.

[0042] Furthermore, in the manufacturing process of circuit board 420, since the first rigid part 422, the flexible part 424, and the second rigid part 426 are formed in the same process flow, the manufacturing steps of circuit board 420 are simplified compared to a discrete structure. A discrete structure requires manufacturing the first rigid part 422 and the second rigid part 426 separately, and then connecting them via an additional connector 440, ribbon cable, or flexible flat cable. This adds an assembly step and requires solder joints or plug terminals at the connection points. In contrast, the integrated circuit board 420 forms a complete electrical signal transmission path immediately after manufacturing, eliminating the need for subsequent assembly interfaces. This reduces the number of components in the connector assembly 400 and also reduces the alignment, plugging, or soldering steps in the assembly process.

[0043] During long-term use of the connector assembly 400, the first rigid part 422 and the second rigid part 426 maintain continuous electrical conductivity through the flexible part 424. Since there are no solder joints or terminals between the first conductive line, the third conductive line, and the second conductive line, the path of the electrical signal from the optical module 430 to the connector 440 does not pass through any separable contact interface. Even when environmental factors such as vibration, temperature cycling, and moisture intrusion exist within the traction converter cabinet, there is no risk of increased contact resistance or signal interruption due to oxidation, loosening, or corrosion of the contact interface. This ensures long-term impedance stability and conductivity reliability of the signal transmission path between the control unit 100 and the power unit 200.

[0044] As can be seen, by adopting the first rigid part 422, the flexible part 424 and the second rigid part 426 as an integral structure, the circuit board 420 eliminates the assembly connection interface between the first rigid part 422 and the flexible part 424 and between the flexible part 424 and the second rigid part 426. This solves the technical problems of high manufacturing complexity, many assembly steps and unreliable signal transmission in long-term use caused by the additional assembly process required by the discrete circuit board 420. Thus, it achieves the technical effects of reducing the manufacturing difficulty of the connector assembly 400, simplifying the assembly process and improving the long-term stability of the signal transmission path.

[0045] This embodiment provides a traction converter, which, in addition to the technical features of the above embodiments, further includes the following technical features.

[0046] like Figure 1 , Figure 2 and Figure 4As shown, the optical module 430 includes a second housing 432, a laser 434, a detector 436, a first pin 438, and a second pin 439. The laser 434 is disposed within the second housing 432 and electrically connected to the first rigid part 422. The detector 436 is disposed within the second housing 432 and electrically connected to the first rigid part 422. The first pin 438 is connected to one of the plurality of optical fibers 500, and the end of the first pin 438 is coupled to the optical surface of the laser 434. The second pin 439 is connected to another of the plurality of optical fibers 500, and the end of the second pin 439 is coupled to the optical surface of the detector 436.

[0047] In this embodiment, each optical module 430 includes a second housing 432, a laser 434, a detector 436, a first pin 438, and a second pin 439. The second housing 432 forms the external protective structure of the optical module 430. The second housing 432 is disposed on the first rigid part 422. The bottom surface of the second housing 432 is disposed opposite to the first surface or the second surface of the first rigid part 422. The second housing 432 is fixedly connected to the first rigid part 422 by screws or clips. The laser 434 is disposed inside the second housing 432. The pins of the laser 434 extend from the bottom of the second housing 432 and are soldered to conductive pads on the first surface or the second surface of the first rigid part 422. The laser 434 is electrically connected to the conductive lines inside the first rigid part 422 through the conductive pads. The laser 434 is used to convert the input electrical signal into an optical signal. The detector 436 is disposed inside the second housing 432. The pins of detector 436 extend from the bottom of the second housing 432 and are soldered to conductive pads on the first or second surface of the first rigid portion 422. Detector 436 is electrically connected to conductive lines within the first rigid portion 422 via these conductive pads. Detector 436 is used to convert input optical signals into electrical signals.

[0048] A first pin 438 is disposed within the second housing 432. The first pin 438 is connected to one of the multiple optical fibers 500. An axially extending first optical channel is formed inside the first pin 438. The incident end face of this first optical channel is opposite to the optical surface of the laser 434. The incident end face of the first pin 438 is coupled to the optical surface of the laser 434. The optical signal generated by the laser 434 enters the first optical channel of the first pin 438 through this optical surface and is transmitted through this first optical channel to the optical fiber 500 connected to the first pin 438. A second pin 439 is disposed within the second housing 432. The second pin 439 is connected to another of the multiple optical fibers 500. An axially extending second optical channel is formed inside the second pin 439. The exit end face of this second optical channel is opposite to the optical surface of the detector 436. The exit end face of the second pin 439 is coupled to the optical surface of the detector 436. The optical signal transmitted in the optical fiber 500 connected to the second pin 439 is emitted to the optical surface of the detector 436 via the second optical channel of the second pin 439 and received by the detector 436.

[0049] In the assembled state, the mounting position of laser 434 on the first rigid part 422 is adjacent to the mounting position of first pin 438 on the first rigid part 422. The optical surface of laser 434 faces the incident end face of first pin 438. The optical signal generated by laser 434 propagates in the gap between the optical surface of laser 434 and the incident end face of first pin 438. The mounting position of detector 436 on the first rigid part 422 is adjacent to the mounting position of second pin 439 on the first rigid part 422. The optical surface of detector 436 faces the exit end face of second pin 439. The optical signal transmitted in the optical fiber 500 connected to second pin 439 propagates in the gap between the exit end face of second pin 439 and the optical surface of detector 436.

[0050] When connector 440 of connector assembly 400 receives an electrical signal from control unit 100 or power unit 200, the electrical signal is transmitted to laser 434 via second rigid part 426, flexible part 424 and first rigid part 422. Laser 434 generates a corresponding optical signal according to the voltage or current change of the electrical signal. The optical signal exits from the optical surface of laser 434 and enters the incident end face of first pin 438. The optical signal enters the optical fiber 500 connected to the first pin 438 via the first optical channel of the first pin 438, and is transmitted in the optical fiber 500 to detector 436 of optical module 430 in another connector assembly 400 of traction converter.

[0051] When an optical signal is transmitted via optical fiber 500 to the second pin 439 of the optical module 430, the optical signal exits from the output end face of the second pin 439 and enters the optical surface of the detector 436. The detector 436 receives the optical signal and converts it into a corresponding electrical signal. This electrical signal is transmitted via the first rigid part 422, the flexible part 424, and the second rigid part 426 to the connector 440 of the connector assembly 400, and is output from the connector 440 to the power unit 200 or the control unit 100.

[0052] Under vibration conditions inside the traction converter cabinet, the bottom surface of the second housing 432 is fastened to the first or second surface of the first rigid part 422 by screws or clips. The pins of the laser 434 and the detector 436 are welded to the first rigid part 422, respectively. The first pin 438 and the second pin 439 are fixed inside the second housing 432. In this way, the laser 434, detector 436, first pin 438 and second pin 439 maintain a fixed position relative to the first rigid part 422 and the second housing 432 during vibration. Due to the gap between the optical surface of the laser 434 and the incident end face of the first pin 438, and the thermal expansion caused by temperature changes during the start-up or operation of the traction converter, the relative distance and angle between them will change. When this gap or angle deviates from the preset range, the coupling efficiency of the optical signal generated by the laser 434 into the first pin 438 will decrease, resulting in optical signal power loss. The optical module 430 encapsulates the laser 434, detector 436, first pin 438, and second pin 439 into a single unit via a second housing 432. Under vibration and temperature variations, the second housing 432, as a whole, vibrates and thermally expands along with the first rigid part 422. The relative positions between the laser 434 and the first pin 438, and between the detector 436 and the second pin 439, are maintained by the internal positioning structure of the second housing 432. Therefore, the gap distance and optical axis angle between the optical surface of the laser 434 and the incident end face of the first pin 438 remain constant within this gap range and will not shift with external vibration or temperature changes. This ensures stable coupling efficiency of the optical signal from the laser 434 to the first pin 438, and stable coupling efficiency of the optical signal from the second pin 439 to the detector 436.

[0053] As can be seen, the optical module 430 encapsulates the laser 434, detector 436, first pin 438, and second pin 439 into one unit using the second housing 432. By directly coupling the optical surface of the laser 434 with the incident end face of the first pin 438 and the exit end face of the second pin 439 with the optical surface of the detector 436, the structure solves the technical problem of easy optical path misalignment between the laser 434 and the first pin 438 and between the second pin 439 and the detector 436 under the vibration and temperature change environment of the traction converter. Thus, it achieves the technical effects of high-efficiency, low-loss coupling transmission of optical signals at the photoelectric conversion interface and stable optical path alignment under long-term vibration conditions.

[0054] This embodiment provides a traction converter, which, in addition to the technical features of the above embodiments, further includes the following technical features.

[0055] like Figure 4 As shown, the second housing 432 includes a second body 452, a second cover 454, and a second connector 456. The second body 452 is provided with a second mounting cavity, in which the laser 434, detector 436, first pin 438, and second pin 439 are located. The second cover 454 covers the opening side of the second mounting cavity. The second connector 456 passes through the second body 452 and the second cover 454 to fix the second body 452 and the second cover 454.

[0056] In this embodiment, the bottom surface of the second body 452 faces the first or second surface of the first rigid part 422. The bottom surface of the second body 452 has multiple pin through-holes. The pins of the laser 434 pass through the corresponding pin through-holes on the bottom surface of the second body 452 and are welded to the first rigid part 422. The pins of the detector 436 pass through the corresponding pin through-holes on the bottom surface of the second body 452 and are welded to the first rigid part 422. The inner wall of the second mounting cavity is provided with a first positioning groove, a second positioning groove, a third positioning groove, and a fourth positioning groove. The first positioning groove is located in a first region within the second mounting cavity. The laser 434 is embedded in the first positioning groove, with its optical surface facing a first direction. The second positioning groove is located in a second region within the second mounting cavity. The detector 436 is embedded in the second positioning groove, with its optical surface facing a second direction. The third positioning groove is located in a third region within the second mounting cavity. The first pin 438 is embedded in the third positioning groove, with its incident end face facing the optical surface of the laser 434. The fourth positioning groove is located in the fourth region within the second mounting cavity. The second pin 439 is embedded in the fourth positioning groove, with the exit end face of the second pin 439 facing the optical surface of the detector 436.

[0057] When the second cover 454 is placed over the opening of the second mounting cavity, the inner surface of the second cover 454 abuts against the upper surfaces of the laser 434, the detector 436, the first pin 438, and the second pin 439, respectively. The second cover 454 applies a downward pressing force to the laser 434, the detector 436, the first pin 438, and the second pin 439 in a direction perpendicular to the surface of the first rigid part 422. This pressing force presses the bottom surface of the laser 434 against the bottom surface of the first positioning groove, the bottom surface of the detector 436 against the bottom surface of the second positioning groove, the bottom surface of the first pin 438 against the bottom surface of the third positioning groove, and the bottom surface of the second pin 439 against the bottom surface of the fourth positioning groove.

[0058] The second connector 456 is inserted into the second cover 454 and the second body 452 in a direction perpendicular to the surface of the first rigid portion 422. The lower end of the second connector 456 extends into the second body 452 and is threadedly connected to the second body 452. Alternatively, the lower end of the second connector 456 passes through the second body 452 and is threadedly connected to the first rigid portion 422. The second connector 456 locks the second cover 454 and the second body 452 together.

[0059] During the operation of the traction converter, the laser 434 generates heat. This heat raises the temperature of the second housing 432. If the second cover 454 is not fixed to the second body 452 by the second connector 456, the second cover 454 may warp due to thermal stress or bounce under vibration. Warping or bouncing of the second cover 454 will reduce or unevenly distribute the clamping force applied to the upper surfaces of the laser 434, detector 436, first pin 438, and second pin 439. When the clamping force decreases, the laser 434 may experience a slight displacement within the first positioning groove, causing a deviation in the optical axis angle between the optical surface of the laser 434 and the incident end face of the first pin 438. Simultaneously, a deviation in the optical axis angle between the optical surface of the detector 436 and the exit end face of the second pin 439 may also occur. After the second cover 454 and the second body 452 are fixed and locked together by the second connector 456, the second cover 454 always maintains a pressing state on the laser 434, detector 436, first pin 438, and second pin 439. Even under conditions where the temperature inside the traction converter cabinet reaches the maximum operating temperature and is subjected to continuous vibration and impact, the relative position between the second cover 454 and the second body 452 is maintained by the locking force of the second connector 456, and there will be no separation or relative sliding. Therefore, the relative position between the optical surface of the laser 434 and the incident end face of the first pin 438 is jointly locked by the first and third positioning grooves inside the second body 452 and the pressing surface of the second cover 454. The relative position between the optical surface of the detector 436 and the exit end face of the second pin 439 is jointly locked by the second and fourth positioning grooves inside the second body 452 and the pressing surface of the second cover 454.

[0060] During long-term operation of the traction converter, dust or conductive particles may accumulate inside the traction converter cabinet. If the laser 434, detector 436, first pin 438, and second pin 439 are exposed outside the second housing 432, these dust or conductive particles may adhere to the optical surfaces of the laser 434, detector 436, the incident end face of the first pin 438, or the exit end face of the second pin 439. Dust adhesion can cause scattering or absorption of the optical signal at the coupling interface, resulting in attenuation of the optical signal transmission power. Conductive particles may also cause short circuits between the pins of the laser 434 or detector 436. After the second cover 454 is installed on the opening side of the second mounting cavity, the laser 434, detector 436, first pin 438, and second pin 439 are enclosed inside the second mounting cavity. A physical barrier is formed at the joint between the second cover 454 and the second body 452. This physical barrier prevents external dust and conductive particles from entering the second mounting cavity, keeping the optical surfaces of the laser 434, the detector 436, the incident end face of the first pin 438, and the exit end face of the second pin 439 clean.

[0061] As can be seen, the second housing 432 uses the positioning groove inside the second body 452 to horizontally position the laser 434, detector 436, first pin 438 and second pin 439, and uses the cooperation of the second cover 454 and the second connector 456 to vertically press these devices together, while enclosing the above devices in the second mounting cavity. This solves the technical problem that the internal optical components of the optical module 430 are prone to positional displacement and optical interface contamination in the high temperature, vibration and dust environment of the traction converter. Thus, it achieves physical protection and position locking of the laser 434, detector 436, first pin 438 and second pin 439, and improves the optical path alignment stability and optical signal transmission efficiency of the optical module 430 under long-term vibration conditions.

[0062] This embodiment provides a traction converter, which, in addition to the technical features of the above embodiments, further includes the following technical features.

[0063] like Figure 1 and Figure 2 As shown, the first housing 410 includes a first body 412, a first cover 414, and a first connector 416; the first body 412 is provided with a first mounting cavity, and the circuit board 420 and multiple optical modules 430 are disposed in the first mounting cavity; the first cover 414 covers the opening side of the first mounting cavity; the first connector 416 passes through the first cover 414 and the first body 412 and is used to fix the first cover 414 and the first body 412.

[0064] In this embodiment, the bottom surface of the first body 412 forms the bottom mounting reference surface of the connector assembly 400. A support structure is provided on the inner wall of the first mounting cavity. This support structure includes a plurality of support pillars spaced apart along the length of the first mounting cavity. The upper end faces of the plurality of support pillars are located in the same horizontal plane, forming a support plane for placing the first rigid part 422. The first rigid part 422 is placed on this support plane. The first rigid part 422, the flexible part 424, and the second rigid part 426 of the circuit board 420 are arranged sequentially along the length of the first housing 410 within the first mounting cavity. After the first cover 414 is placed on the opening side of the first mounting cavity, the inner surface of the first cover 414 faces the upper surfaces of the plurality of optical modules 430. A first connector 416 passes through the first cover 414 and the first body 412 in a direction perpendicular to the surface of the first rigid part 422. The lower end of the first connector 416 extends into the threaded hole of the first body 412 and is threadedly connected to the first body 412. The first connector 416 applies a locking force along the axial direction of the first connector 416 to the first cover 414 and the first body 412.

[0065] During the operation of the traction converter, the traction converter cabinet will experience broadband random vibrations due to vehicle wheel-rail contact and motor rotation. This vibration is transmitted to the first body 412 through the mounting feet of the first housing 410. If the first cover 414 is not fixed to the first body 412 by the first connector 416, the first cover 414 may experience high-frequency micro-amplitude jumping relative to the first body 412 under vibration. The jumping of the first cover 414 will cause the gap distance between the inner surface of the first cover 414 and the upper surface of the multiple optical modules 430 to change continuously. When this gap distance increases during vibration, the constraint force of the optical module 430 in the vertical direction decreases. In this state, the first and second positioning slots of the second housing 432 inside the optical module 430 may not provide sufficient vertical constraint for the laser 434 and the detector 436, causing the optical path alignment between the optical surface of the laser 434 and the incident end face of the first pin 438 to shift in the vertical direction.

[0066] After the first cover 414 is fixed to the first body 412 via the first connector 416, the first cover 414 is continuously pressed against the upper surface of the first body 412. The locking force provided by the first connector 416 is not lost due to the instantaneous change in vibration acceleration during vibration. The inner surface of the first cover 414 is always kept in contact with the upper surface of the second housing 432 of the multiple optical modules 430 by the locking force of the first connector 416. This contact state ensures that the optical modules 430 are continuously constrained by the first cover 414 in the vertical direction. When the vibration acceleration is transmitted to the optical module 430, the optical module 430 vibrates together with the first cover 414 and the first body 412, and there is no relative movement between the optical module 430 and the first cover 414. Therefore, the laser 434, detector 436, first pin 438 and second pin 439 in the second housing 432 of the multiple optical modules 430 always maintain their designed positions in the horizontal and vertical directions within the first housing 410, and will not drift due to the movement of the first cover 414.

[0067] During long-term operation of the traction converter, the temperature inside the traction converter cabinet undergoes periodic changes due to the combined effects of ambient temperature and the heat generated by the power devices. This temperature change causes thermal expansion and contraction of the first cover 414 and the first body 412. If the first cover 414 and the first body 412 are not fixed together by the first connector 416, the mating surfaces between them may experience micron-level relative slippage during temperature cycling due to differences in their coefficients of thermal expansion. This relative slippage accumulates and alters the initial alignment between the first cover 414 and the first body 412. When this accumulated offset exceeds the allowable alignment error between the optical surface of the laser 434 inside the optical module 430 and the incident end face of the first pin 438, a measurable decrease in optical coupling efficiency occurs. After the first connector 416 passes through the first cover 414 and the first body 412, the first cover 414 and the first body 412 are locked and fixed along the axial direction of the first connector 416. During temperature changes, even if there is a difference in thermal expansion between the first cover 414 and the first body 412, the difference will be manifested as the uniform expansion or contraction of the first cover 414 and the first body 412 as a whole relative to the axis of the first connector 416. The joint surface between the first cover 414 and the first body 412 will not slip relative to each other. Therefore, the horizontal position of the first cover 414 relative to the first body 412 remains unchanged.

[0068] Furthermore, after the first cover 414 is placed over the opening side of the first mounting cavity, a continuously closed sealing interface is formed between the edge of the first cover 414 and the edge of the first body 412. This sealing interface isolates the first mounting cavity from the outside of the first housing 410. When the first connector 416 passes through the first cover 414 and the first body 412 and is locked, the first connector 416 applies additional clamping force to the sealing interface, reducing the gap size of the sealing interface. In an environment where conductive dust or oil mist exists inside the traction converter cabinet, this reduced gap size prevents conductive dust or oil mist from entering the first mounting cavity from the outside of the first housing 410, keeping the conductive lines of the circuit board 420 and the pins of the optical module 430 inside the first mounting cavity clean and insulated from each other. This avoids a decrease in insulation resistance or short circuit between adjacent conductive lines due to conductive dust accumulation on the surface of the circuit board 420, and also avoids solder joint corrosion or increased contact resistance caused by oil mist adhering to the solder joints of the pins of the second housing 432 of the optical module 430 and the first rigid part 422.

[0069] Therefore, the first housing 410, by using the first connector 416 to fix and lock the first cover 414 and the first body 412, allows the first cover 414 to exert continuous vertical constraint on the multiple optical modules 430 in the first mounting cavity, and maintains the positional stability of the joint surface between the first cover 414 and the first body 412 under vibration and temperature cycling. At the same time, the sealing interface between the first cover 414 and the first body 412 encloses the circuit board 420 and the optical modules 430 in the first mounting cavity. This solves the technical problems of insufficient vertical constraint on the optical modules 430 inside the first housing 410 under vibration and temperature change environment of the traction converter, which leads to optical path deviation, and external dust and oil mist intrusion, which leads to a decrease in circuit insulation performance. Thus, it achieves the technical effect of improving the structural stability and internal environmental cleanliness of the connector assembly 400 under long-term service conditions.

[0070] This embodiment provides a traction converter, which, in addition to the technical features of the above embodiments, further includes the following technical features.

[0071] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the traction converter also includes a cable guide sleeve 600, which is sandwiched between the first body 412 and the first cover 414, located on the side of the first body 412 away from the connector 440. The cable guide sleeve 600 is provided with multiple cable holes 610 and multiple slots 620. The multiple slots 620 are respectively connected to the multiple cable holes 610, and the slots 620 extend from the cable holes 610 to the edge of the cable guide sleeve 600. Multiple optical fibers 500 pass through the cable holes 610.

[0072] In this embodiment, a tail mounting groove is provided on the side of the first body 412 away from the connector 440. The tail mounting groove is a recessed structure formed by indentation from the upper surface of the first body 412 downwards. The width of the tail mounting groove is adapted to the width of the cable guide sleeve 600. The cable guide sleeve 600 is placed in the tail mounting groove. The lower surface of the cable guide sleeve 600 abuts against the bottom surface of the tail mounting groove. The upper surface of the cable guide sleeve 600 is higher than or flush with the upper surface of the first body 412. After the first cover 414 is placed on the opening side of the first mounting cavity, the lower surface of the first cover 414 abuts against the upper surface of the cable guide sleeve 600. When the first connector 416 passes through the first cover 414 and the first body 412 and is locked, the first connector 416 applies a downward pulling force to the first cover 414. This pulling force causes the first cover 414 to move downwards in a direction perpendicular to the first body 412. The lower surface of the first cover 414 exerts downward pressure on the upper surface of the wire guide sleeve 600 as it moves downward. Under this pressure, the wire guide sleeve 600 is compressed between the first cover 414 and the first body 412. The wire guide sleeve 600 undergoes elastic deformation in the thickness direction.

[0073] The cable guide sleeve 600 is made of an elastomeric material. This elastomeric material contracts in volume and expands towards the inner wall of the cable guide hole 610 when subjected to compressive force. The initial inner diameter of the cable guide hole 610 is larger than the outer diameter of the optical fiber 500 in the uncompressed state. When the optical fiber 500 is inserted into the cable guide hole 610, an initial gap exists between the outer wall of the optical fiber 500 and the inner wall of the cable guide hole 610, which facilitates the insertion of the optical fiber 500 into the cable guide hole 610 during assembly. When the first cover 414 applies compressive force to the cable guide sleeve 600, the cable guide sleeve 600 is compressed in the thickness direction. During compression, the material of the cable guide sleeve 600 flows towards the inner wall of the cable guide hole 610, reducing the inner diameter of the cable guide hole 610. The inner wall of the cable guide hole 610 moves towards the outer wall of the optical fiber 500 and fits tightly against the outer wall of the optical fiber 500. The inner wall of the cable guide hole 610 applies radial pressure to the outer wall of the optical fiber 500. The radial pressure creates an interference fit between the outer wall of the optical fiber 500 and the inner wall of the cable passage 610. This interference fit secures the optical fiber 500 within the cable passage 610.

[0074] During the operation of the traction converter, the traction converter cabinet is subjected to continuous broadband random vibration. This vibration is transmitted to the cable guide sleeve 600 through the first body 412 and the first cover 414. After the optical fiber 500 extends from the inside of the first housing 410 to the outside, the section located outside the first housing 410 will swing under the action of vibration. This swing will generate a pull-out force along the axial direction of the optical fiber 500 at the contact interface between the optical fiber 500 and the cable guide hole 610. When there is no interference fit between the inner wall of the cable guide hole 610 and the outer wall of the optical fiber 500, this pull-out force will cause the optical fiber 500 to slide axially within the cable guide hole 610. The axial sliding of the optical fiber 500 will cause the first ferrule 438 or the second ferrule 439 at the end of the optical fiber 500 to move relative to the second housing 432. This movement increases the gap between the incident end face of the first ferrule 438 and the optical surface of the laser 434, or increases the gap between the exit end face of the second ferrule 439 and the optical surface of the detector 436, resulting in a decrease in optical coupling efficiency. The radial pressure applied to the optical fiber 500 by the compressed cable sheath 600 increases the static friction between the optical fiber 500 and the inner wall of the cable hole 610. When the optical fiber 500 is subjected to a pull-out force generated by vibration, this static friction force is opposite to the pull-out force along the axial direction of the optical fiber 500 and counteracts the pull-out force. Therefore, the axial position of the optical fiber 500 within the cable hole 610 remains fixed under vibration and does not slide axially, thereby maintaining optical path alignment between the first ferrule 438 and the laser 434, and between the second ferrule 439 and the detector 436.

[0075] When the cable guide sleeve 600 requires maintenance or replacement of a single optical fiber 500, the operator first loosens the first connector 416 and removes the first cover 414 from the first body 412. At this time, the compressive force of the first cover 414 on the cable guide sleeve 600 is removed. The cable guide sleeve 600 returns to its uncompressed state. The inner diameter of the cable hole 610 returns to its initial size, and the radial pressure between the inner wall of the cable hole 610 and the outer wall of the optical fiber 500 disappears. The operator pulls the optical fiber 500 to be replaced along the groove 620 from the edge of the cable guide sleeve 600 towards the cable hole 610. Since the groove 620 extends from the cable hole 610 to the edge of the cable guide sleeve 600, the optical fiber 500 moves radially within the groove 620 without obstruction. The optical fiber 500 disengages from the cable hole 610 through the groove 620 and is removed from the edge of the cable guide sleeve 600. The operator presses the new optical fiber 500 along the cut 620 from the edge of the cable guide sheath 600, moving the optical fiber 500 along the cut 620 into the cable guide hole 610. During this process, the operator does not need to pull all the optical fibers 500 out of the cable guide hole 610, nor does he / she need to cut or remove the first ferrule 438 or the second ferrule 439 at the end of the optical fiber 500. The removal and insertion of a single optical fiber 500 does not involve the movement or rearrangement of other optical fibers 500.

[0076] After long-term operation within the traction converter cabinet, the optical signal transmission power of one fiber optic cable 500 may attenuate due to aging or bending, necessitating replacement of that fiber optic cable 500. Without disturbing other fibers 500, the operator removes the fiber optic cable 500 to be replaced from the cable sheath 600 through the slot 620, and inserts the new fiber optic cable 500 into the cable sheath 600 through the slot 620, completing the replacement. After replacement, the operator replaces the first cover 414 on the first body 412 and locks it in place using the first connector 416. The cable sheath 600 is then compressed again, securing all fibers 500 tightly.

[0077] As can be seen, the cable guide sleeve 600, by being sandwiched between the first body 412 and the first cover 414 and utilizing the compressive force when the first cover 414 is locked, forms an interference fit between the inner wall of the cable guide hole 610 and the outer wall of the optical fiber 500. By providing a groove 620 extending to the edge of the cable guide sleeve 600 for each cable guide hole 610, the technical problems of optical path misalignment caused by axial sliding of the optical fiber 500 under the vibration environment of the traction converter and the inability to independently replace a single optical fiber 500 when multiple optical fibers 500 are arranged side by side are solved. Thus, the technical effects of dual fixation of axial locking and radial clamping of the optical fiber 500 under strong vibration conditions and convenient removal of a single optical fiber 500 are achieved.

[0078] This embodiment provides a traction converter, which, in addition to the technical features of the above embodiments, further includes the following technical features.

[0079] The diameter of the through hole 610 is smaller than the diameter of the optical fiber 500.

[0080] In this embodiment, the through-hole 610 is formed as a circular through-hole with a first inner diameter. This first inner diameter is smaller than the outer diameter of the optical fiber 500. When the optical fiber 500 is not inserted into the through-hole 610, the inner wall of the through-hole 610 forms a closed annular boundary defined by its own material, the inner diameter of which is the first inner diameter. During the insertion of the optical fiber 500 into the through-hole 610, because the outer diameter of the optical fiber 500 is larger than the first inner diameter of the through-hole 610, the outer wall of the optical fiber 500 first contacts the entrance edge of the through-hole 610. When the operator pushes the optical fiber 500 towards the through-hole 610 along the groove 620, the outer wall of the optical fiber 500 applies an outwardly expanding radial force to the inner wall of the through-hole 610. Under the action of this radial force, the material of the through-hole sheath 600 undergoes elastic tensile deformation, causing the first inner diameter of the through-hole 610 to expand to a temporary diameter larger than the outer diameter of the optical fiber 500. Once the optical fiber 500 is fully inserted into the cable guide hole 610, the operator removes the pushing force on the optical fiber 500. Under the action of elastic restoring force, the material of the cable guide sheath 600 returns to its undeformed state, restoring the first inner diameter of the cable guide hole 610 to its initial value. Since this first inner diameter is smaller than the outer diameter of the optical fiber 500, the inner wall of the cable guide hole 610 moves towards the outer wall of the optical fiber 500 during the elastic restoring process, and eventually fits tightly against the outer wall of the optical fiber 500.

[0081] During the operation of the traction converter, the optical fiber 500 is subjected to tensile forces or oscillating forces caused by vibration from the inside and outside of the first housing 410. When subjected to these forces, the outer wall of the optical fiber 500 pushes radially outward against the inner wall of the cable passage 610. Since the first inner diameter of the cable passage 610 in the unloaded state is already smaller than the outer diameter of the optical fiber 500, the inner wall of the cable passage 610 always applies a radial restoring force pointing towards the axis of the optical fiber 500 to the outer wall of the optical fiber 500. This radial restoring force generates contact pressure between the inner wall of the cable passage 610 and the outer wall of the optical fiber 500. This contact pressure is uniformly distributed along the circumference of the inner wall of the cable passage 610, so that the optical fiber 500 is subjected to a uniform clamping force in the entire circumference within the cable passage 610. When the optical fiber 500 is subjected to a pull-out force along its axial direction, this contact pressure generates a static friction force between the outer wall of the optical fiber 500 and the inner wall of the cable passage 610. The direction of this static friction force is along the axial direction of the optical fiber 500 and opposite to the direction of the pull-out force. The magnitude of static friction is directly proportional to the product of contact pressure and the coefficient of friction. When the diameter of the cable guide hole 610 is smaller than the diameter of the optical fiber 500, the contact pressure is determined by the elastic compression of the cable guide sheath 600 material, which is equal to the difference between the outer diameter of the optical fiber 500 and the first inner diameter of the cable guide hole 610. The larger this diameter difference, the greater the elastic compression of the cable guide sheath 600 material after installation, resulting in a greater contact pressure and a higher upper limit for static friction.

[0082] When the traction converter is in the startup phase or power surge phase, the vibration acceleration inside the cabinet instantaneously reaches its peak value. This vibration acceleration is transmitted to the cable guide sheath 600 through the first housing 410, generating a peak pull-out force along the axial direction of the optical fiber 500 on the section of the optical fiber 500 located outside the first housing 410. Since the diameter of the cable guide hole 610 is designed to be smaller than the diameter of the optical fiber 500, the upper limit of the static friction force obtained by the optical fiber 500 within the cable guide hole 610 is greater than this peak pull-out force. Therefore, the axial position of the optical fiber 500 within the cable guide hole 610 remains fixed when the vibration acceleration peak occurs, and it will not slip axially due to the instantaneous pull-out force exceeding the static friction force. Even if the optical fiber 500 is subjected to continuous traction along its axial direction outside the first housing 410, the continuous traction force is completely offset by the static friction between the inner wall of the wire hole 610 and the outer wall of the optical fiber 500, and the optical path alignment between the first ferrule 438 or the second ferrule 439 connected to the end of the optical fiber 500 and the laser 434 or the detector 436 remains in the initial assembly state.

[0083] During the long-term operation of the traction converter, if the cable guide sleeve 600 experiences material stress relaxation due to prolonged compression, the contact pressure between the cable guide sleeve 600 and the optical fiber 500 will gradually decrease as the stress relaxes. When the initial diameter of the cable guide hole 610 is smaller than the diameter of the optical fiber 500, even after long-term stress relaxation, the diameter of the cable guide hole 610 after relaxation will still be smaller than or equal to the outer diameter of the optical fiber 500. This means that throughout the entire service life of the material, even if the contact pressure decreases, the inner wall of the cable guide sleeve 600 will still maintain physical contact with the outer wall of the optical fiber 500, and gaps will not form due to material relaxation. This physical contact ensures that the optical fiber 500 is continuously held tightly by the cable guide sleeve 600, and will not slide freely within the cable guide hole 610 due to the complete loss of contact pressure.

[0084] Therefore, by using a hole size smaller than that of the optical fiber 500, the cable guide 610 ensures that the cable guide sheath 600 remains in an elastically compressed state after the optical fiber 500 is inserted. This creates a uniform contact pressure and static friction force throughout the circumference between the inner wall of the cable guide 610 and the outer wall of the optical fiber 500. This solves the technical problem of optical path misalignment caused by axial slippage of the optical fiber 500 within the cable guide 610 due to insufficient clamping force in the vibration environment of the traction converter. As a result, the cable guide sheath 600 achieves reliable clamping and axial locking of the optical fiber 500 within the cable guide sheath 600.

[0085] This embodiment provides a traction converter, which, in addition to the technical features of the above embodiments, further includes the following technical features.

[0086] like Figure 2 and Figure 7As shown, the inner side of the first cover 414 is provided with a plurality of protrusions 418, which abut against the optical module 430.

[0087] In this embodiment, the first rigid part 422 is fixed to the bottom wall of the first body 412 by an adapter screw. The adapter screw passes through the first rigid part 422 in a direction perpendicular to the surface of the first rigid part 422, and its lower end is screwed into a threaded hole on the bottom wall of the first body 412. The adapter screw applies a downward pulling force to the first rigid part 422, pulling the first rigid part 422 toward the bottom wall of the first body 412. After the first cover 414 is placed on the opening side of the first mounting cavity, the first connector 416 applies a downward pulling force to the first cover 414. The first cover 414 moves downward under the action of this pulling force. A plurality of protrusions 418 on the inner surface of the first cover 414 move downward together with the first cover 414. During the downward movement, the lower end faces of the plurality of protrusions 418 respectively contact the upper surface of the second housing 432 of the corresponding optical module 430 and apply downward pressure to the second housing 432. The pressure is transmitted through the second housing 432 to the bottom surface of the optical module 430 and is received by the first rigid part 422. The first rigid part 422 bears the downward pressure through the adapter screw and transmits the pressure to the bottom wall of the first body 412. Thus, the optical module 430 is vertically constrained between the protrusion 418 of the first cover 414 and the bottom wall of the first body 412.

[0088] During the operation of the traction converter, the vibration acceleration generated by the vibration source inside the traction converter cabinet acts vertically upward on the first housing 410. This vertically upward vibration acceleration causes the first cover 414 to tend to detach upward from the first body 412. If the inner surface of the first cover 414 is flat and does not have a protrusion 418, the contact between the first cover 414 and the upper surface of the second housing 432 of the optical module 430 is a surface contact. Under the condition of surface contact, when the vibration acceleration is upward, the contact pressure between the first cover 414 and the upper surface of the second housing 432 decreases. When the contact pressure decreases to zero, a separation gap is generated between the first cover 414 and the second housing 432. At the instant this separation gap exists, the optical module 430 loses its upward constraint in the vertical direction. Under the action of inertia, the optical module 430 may continue to move upward with the vibration acceleration, causing the second housing 432 to have an upward displacement relative to the first rigid part 422. This displacement causes the incident end face of the first pin 438 inside the second housing 432 to shift in the vertical direction from the optical surface of the laser 434, resulting in a decrease in optical coupling efficiency.

[0089] By providing multiple protrusions 418 on the inner surface of the first cover 414, the lower end face area of ​​each protrusion 418 is smaller than the area of ​​the inner surface of the first cover 414. Under the same locking force provided by the first connector 416, the contact area between the protrusion 418 and the upper surface of the second housing 432 of the optical module 430 is smaller than the area of ​​planar contact. Therefore, the contact pressure between the protrusion 418 and the upper surface of the second housing 432 is greater than the contact pressure under planar contact conditions. This increased contact pressure ensures that the first cover 414 and the second housing 432 remain in contact even when the peak vibration acceleration occurs, preventing separation gaps. Even when the vibration acceleration is upward and the amplitude is close to the static clamping force generated by the locking force of the first connector 416, the increased contact pressure keeps the normal force at the contact interface between the first cover 414 and the second housing 432 positive, ensuring that the first cover 414 and the second housing 432 do not separate. Even under the vertically upward vibration acceleration, the optical module 430 is still continuously pressed against the first rigid part 422 by the protrusion 418, and no upward relative displacement occurs.

[0090] In a curved installation scenario where the connector assembly 400 is used in a traction converter, the connector assembly 400 extends horizontally into the internal space of the cabinet. Optical modules 430 are staggered on both sides of the first rigid section 422, with multiple optical modules 430 occupying a certain overhanging area along their length. The first rigid section 422 is fixed to the first body 412 only at its front end using adapter screws. The overhanging area where the optical modules 430 are located is at the rear end of the first rigid section 422, which is far from the fixing position of the adapter screws. Under vibration, this overhanging area experiences bending vibration with the fixing position of the adapter screws as the fulcrum. If the inner surface of the first cover 414 does not have protrusions 418, the first cover 414 only applies a uniformly distributed pressure in the vertical direction to the upper surface of the second housing 432 of the optical modules 430. This uniformly distributed pressure generates a limited bending moment against the overhanging area of ​​the first rigid section 422. When bending vibration causes the overhanging area of ​​the first rigid part 422 to flex upwards, this flexing increases the gap between the upper surface of the second housing 432 of the optical module 430 and the inner surface of the first cover 414, weakening the clamping effect. Multiple protrusions 418 directly abut against the upper surface of the second housing 432 of each optical module 430, concentrating the locking force of the first connector 416 onto the local area where the optical module 430 is located. This locally concentrated pressure generates a local anti-bending moment in the overhanging area of ​​the first rigid part 422. This anti-bending moment is opposite in direction to the flexural moment generated by the bending vibration, offsetting part of the flexural moment and thus reducing the upward flexing amplitude of the overhanging area of ​​the first rigid part 422. After the upward flexing amplitude of the first rigid part 422 decreases, the relative displacement between the second housing 432 and the first rigid part 422 of the optical module 430 decreases accordingly, and the optical axis angle between the optical surface of the laser 434 inside the second housing 432 and the incident end face of the first pin 438 remains stable.

[0091] During long-term operation of the traction converter, the first connector 416 and the adapter screw constitute a dual fixing path for the optical module 430. The first connector 416 applies a downward clamping force to the optical module 430 through the first cover 414 and the protrusion 418, which presses the optical module 430 against the first rigid part 422. The adapter screw pulls the first rigid part 422 towards the bottom wall of the first body 412, so that the first rigid part 422 provides an upward supporting force to the optical module 430. The aforementioned downward clamping force and upward supporting force work together on the optical module 430, so that the optical module 430 is in a state of force balance in the vertical direction. When the first connector 416 experiences a slight loosening of its threads due to vibration, the locking force of the first connector 416 on the first cover 414 is partially reduced, and the clamping force of the protrusion 418 on the optical module 430 is correspondingly reduced. At this time, the tension of the adapter screw on the first rigid part 422 remains unchanged, and the first rigid part 422 still provides upward support to the optical module 430 through the second housing 432. Since the protrusion 418 remains in contact with the upper surface of the second housing 432 of the optical module 430, even if the clamping force decreases, the vertical position of the optical module 430 is still defined by the support surface of the first rigid part 422, and will not immediately produce vertical displacement due to slight loosening of the first connector 416. The vertical position stability of the optical module 430 is maintained by both the first connector 416 and the adapter screw, and slight loosening of either connector will not cause a change in the vertical position of the optical module 430 on its own.

[0092] As can be seen, the first body 412 provides multiple protrusions 418 on the inner surface of the first cover 414 corresponding to the position of the optical module 430, so that the protrusions 418 and the adapter screw form a double vertical clamping and support above and below the optical module 430, respectively. The bending stiffness of the overhanging area of ​​the first rigid part 422 is enhanced by the local concentrated clamping of the protrusions 418, which solves the technical problem of optical module 430 displacement due to insufficient vertical constraint under the vertical vibration and bending vibration conditions of the traction converter, resulting in optical path misalignment. Thus, the technical effect of vertical double fixation and optical path alignment stability of optical module 430 under strong vibration environment is achieved.

[0093] This embodiment provides a traction converter, which, in addition to the technical features of the above embodiments, further includes the following technical features.

[0094] like Figure 3 and Figure 8As shown, there are multiple power units 200, and multiple connector assemblies 400 include a first connector assembly 460, a second connector assembly 470, and a third connector assembly 480. The first connector assembly 460 is connected to the control unit 100. The second connector assembly 470 is connected to one of the multiple power units 200, and the optical module 430 of the second connector assembly 470 is connected to a portion of the multiple optical modules 430 of the first connector assembly 460 via an optical fiber 500. The third connector assembly 480 is connected to another power unit 200, and the optical module 430 of the third connector assembly 480 is connected to another portion of the multiple optical modules 430 of the first connector assembly 460 via an optical fiber 500.

[0095] In this embodiment, there are multiple power units 200. The multiple power units 200 are arranged sequentially along their mounting positions within the traction converter cabinet. Multiple connector assemblies 400 include a first connector assembly 460, a second connector assembly 470, and a third connector assembly 480. The first connector assembly 460 is connected to the control unit 100. The connector 440 of the first connector assembly 460 is plugged into the output or input interface of the control unit 100. The first connector assembly 460 is located near the control unit 100 and is used to receive control electrical signals from the control unit 100 and transmit electrical signals fed back from the power units 200 to the control unit 100. The first connector assembly 460 has sixteen optical modules 430. Eight of the sixteen optical modules 430 are transmitting optical modules used to convert electrical signals into optical signals. The other eight optical modules 430 are receiving optical modules used to convert optical signals into electrical signals.

[0096] The second connector assembly 470 is connected to one of the power units 200 among the plurality of power units 200. The connector 440 of the second connector assembly 470 is plugged into the control interface or feedback interface of the power unit 200. The second connector assembly 470 is located near the power unit 200 and is used to transmit control electrical signals to the power unit 200 and to send the electrical signals fed back by the power unit 200 to the first connector assembly 460. The second connector assembly 470 has eight optical modules 430. Four of the eight optical modules 430 are receiving optical modules, used to convert optical signals into electrical signals. The other four optical modules 430 are transmitting optical modules, used to convert electrical signals into optical signals.

[0097] The third connector assembly 480 is connected to another power unit 200 among the plurality of power units 200. The connector 440 of the third connector assembly 480 is plugged into the control interface or feedback interface of the other power unit 200. The third connector assembly 480 is located near the other power unit 200 and is used to transmit control electrical signals to the other power unit 200 and send the electrical signals fed back from the other power unit 200 to the first connector assembly 460. The third connector assembly 480 has eight optical modules 430. Four of the eight optical modules 430 are receiving optical modules, used to convert optical signals into electrical signals. The other four optical modules 430 are transmitting optical modules, used to convert electrical signals into optical signals.

[0098] The receiving optical module of the second connector assembly 470 is connected to a portion of the transmitting optical modules among the sixteen optical modules 430 of the first connector assembly 460 via optical fiber 500. Specifically, the four receiving optical modules of the second connector assembly 470 are connected one-to-one with the four transmitting optical modules of the first connector assembly 460 via four optical fibers 500. The four transmitting optical modules of the first connector assembly 460 convert the control electrical signals sent by the control unit 100 into optical signals, which are transmitted to the four receiving optical modules of the second connector assembly 470 via the four optical fibers 500. The four receiving optical modules of the second connector assembly 470 convert the optical signals into control electrical signals and transmit them to the power unit 200 through the connector 440 of the second connector assembly 470.

[0099] The transmitting optical module of the second connector assembly 470 is connected via optical fiber 500 to a portion of the receiving optical modules among the sixteen optical modules 430 of the first connector assembly 460. Specifically, the four transmitting optical modules of the second connector assembly 470 are connected one-to-one with the four receiving optical modules of the first connector assembly 460 via four optical fibers 500. The four transmitting optical modules of the second connector assembly 470 convert the electrical signal fed back from the power unit 200 into an optical signal, which is transmitted via the four optical fibers 500 to the four receiving optical modules of the first connector assembly 460. The four receiving optical modules of the first connector assembly 460 convert the optical signal into a feedback electrical signal and transmit it to the control unit 100 via the connector 440 of the first connector assembly 460.

[0100] The receiving optical module of the third connector assembly 480 is connected via optical fiber 500 to another portion of the transmitting optical modules among the sixteen optical modules 430 of the first connector assembly 460. Specifically, four receiving optical modules of the third connector assembly 480 are respectively connected to four other transmitting optical modules of the first connector assembly 460 via four other optical fibers 500. These four other transmitting optical modules of the first connector assembly 460 convert the control electrical signals sent by the control unit 100 into optical signals, which are then transmitted to the four receiving optical modules of the third connector assembly 480 via the four other optical fibers 500. The four receiving optical modules of the third connector assembly 480 convert the optical signals into control electrical signals and transmit them to the other power unit 200 via connector 440 of the third connector assembly 480.

[0101] The transmitting optical module of the third connector assembly 480 is connected via optical fiber 500 to another portion of the receiving optical modules among the sixteen optical modules 430 of the first connector assembly 460. Specifically, four transmitting optical modules of the third connector assembly 480 are respectively connected to four other receiving optical modules of the first connector assembly 460 via four other optical fibers 500. The four transmitting optical modules of the third connector assembly 480 convert the electrical signal fed back from the other power unit 200 into an optical signal, which is transmitted via the four other optical fibers 500 to the four other receiving optical modules of the first connector assembly 460. The four other receiving optical modules of the first connector assembly 460 convert the optical signal into a feedback electrical signal and transmit it to the control unit 100 via the connector 440 of the first connector assembly 460.

[0102] In actual traction converter networking, the number of power units 200 may be more than two. When the number of power units 200 is M and M is an integer greater than or equal to two, the connector assembly 400 is configured as follows: The first connector assembly 460 is connected to the control unit 100. The first connector assembly 460 has a total of 8M optical modules 430, of which 4M are transmitting optical modules and 4M are receiving optical modules. Each of the M power units 200 corresponds to one connector assembly 400. The connector assembly 400 corresponding to each power unit 200 has a total of eight optical modules 430, of which four are receiving optical modules and four are transmitting optical modules. The four receiving optical modules of the connector assembly 400 corresponding to the i-th power unit 200 are connected to the i-th group of four transmitting optical modules in the 4M transmitting optical modules of the first connector assembly 460 through four optical fibers 500. The four transmitting optical modules of the connector assembly 400 corresponding to the i-th power unit 200 are connected to the i-th group of four receiving optical modules in the 4M receiving optical modules of the first connector assembly 460 through four optical fibers 500. Here, i is an integer from 1 to M.

[0103] After the fiber optic cables 500 are connected between the first connector assembly 460 and the second connector assembly 470 and the third connector assembly 480, the operator verifies the signal link corresponding to each power unit 200 before starting the traction converter. The operator sends a test signal to the first connector assembly 460 for the power unit 200 corresponding to the second connector assembly 470 via the control unit 100. This test signal is converted by the transmitting optical module in the first connector assembly 460 corresponding to the receiving optical module of the second connector assembly 470, and then transmitted along the corresponding fiber optic cable 500 to the receiving optical module of the second connector assembly 470. The receiving optical module of the second connector assembly 470 converts the optical signal of the test signal into an electrical signal, and then transmits it to the corresponding power unit 200 via the connector 440 of the second connector assembly 470. The response signal returned by the power unit 200 returns to the control unit 100 along the fiber optic cable 500 path from the transmitting optical module of the second connector assembly 470 to the corresponding receiving optical module of the first connector assembly 460. After confirming that the response signal originates from the power unit 200 corresponding to the second connector assembly 470, the control unit 100 determines that the link configuration is correct. Then, the control unit 100 checks the link of the power unit 200 corresponding to the third connector assembly 480 in the same manner. Since the four transmitting optical modules and four receiving optical modules connected to the second connector assembly 470 in the first connector assembly 460 are completely identical in number and connection relationship to the other four transmitting optical modules and four receiving optical modules connected to the third connector assembly 480 in the first connector assembly 460, the only difference being the specific group of optical modules 430 connected to the optical fiber 500, the operator only needs to identify the power unit 200 corresponding to each group of optical modules 430 through the channel allocation settings of the control unit 100, without requiring any hardware modifications or rewiring within the first connector assembly 460.

[0104] During the operation of the traction converter, when a power unit 200 malfunctions and requires isolation for maintenance, the operator marks the corresponding optical module 430 channel group of the power unit 200 as offline via the control unit 100. The control unit 100 stops sending control signals to the transmitting optical module of that channel group and ignores the feedback signals returned by the receiving optical module of that channel group. Since the optical fiber 500 connections between the optical modules 430 of other channel groups in the first connector assembly 460 and the second connector assembly 470 and the third connector assembly 480 remain physically intact, the operator can complete the isolation of the power unit 200 without unplugging or replugging any optical fiber 500. After the power unit 200 is repaired, the operator remarks the channel group as online via the control unit 100, and the signal transmission link is immediately restored.

[0105] Therefore, it can be seen that the optical cable assembly 300, by adopting the grouped optical fiber 500 connection topology between the first connector assembly 460 and the second connector assembly 470 and the third connector assembly 480, and by utilizing the grouped configuration of the transmitting optical module and the receiving optical module in the first connector assembly 460, solves the technical problems of needing to redesign the hardware for different numbers of power units 200 when networking multi-power unit 200 traction converters, and needing to rewire when adding, removing or malfunctioning power units 200. This achieves the technical effects of standardized configuration of connector assembly 400, flexible expansion of the number of power units 200, and online isolation and recovery of power units 200.

[0106] In the claims, description, and accompanying drawings of this invention, the term "plural" refers to two or more objects. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and simplifying the descriptive process, and are not intended to indicate or imply that the device or element referred to must have the described specific orientation, or be constructed and operated in a specific orientation. Therefore, these descriptions should not be construed as limiting the invention. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects or an indirect connection between multiple objects through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances described above.

[0107] In the claims, description, and accompanying drawings of this invention, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In the claims, description, and accompanying drawings of this invention, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0108] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A traction converter, characterized in that, include: Control unit (100); Power unit (200); An optical cable assembly (300) includes multiple connector assemblies (400) and multiple optical fibers (500). The multiple connector assemblies (400) are respectively connected to the control unit (100) and the power unit (200). The connector assembly (400) includes a first housing (410), a circuit board (420) and multiple optical modules (430). The circuit board (420) is disposed in the first housing (410). The multiple optical modules (430) are respectively arranged on both sides of the circuit board (420), and the multiple optical modules (430) located on both sides of the circuit board (420) are arranged alternately. The multiple optical modules (430) are respectively connected to the multiple optical fibers (500).

2. The traction converter according to claim 1, characterized in that, The connector assembly (400) further includes a connector (440) disposed on one side of the first housing (410), and the circuit board (420) includes: The first rigid part (422) is mounted on the first housing (410), and the optical module (430) is disposed on the first rigid part (422). A flexible part (424) is connected to the first rigid part (422) on one side; The second rigid part (426) is connected to the other side of the flexible part (424) and is electrically connected to the connector (440).

3. The traction converter according to claim 2, characterized in that, The circuit board (420) is an integral structure.

4. The traction converter according to claim 2, characterized in that, The optical module (430) includes: Second shell (432); A laser (434) is disposed within the second housing (432) and electrically connected to the first rigid part (422); The detector (436) is disposed inside the second housing (432) and is electrically connected to the first rigid part (422); A first ferrule (438) is connected to one of the plurality of optical fibers (500), and the end of the first ferrule (438) is coupled to the optical surface of the laser (434). The second pin (439) is connected to another of the plurality of optical fibers (500), and the end of the second pin (439) is coupled to the optical surface of the detector (436).

5. The traction converter according to claim 4, characterized in that, The second housing (432) includes: The second body (452) is provided with a second mounting cavity, and the laser (434), the detector (436), the first pin (438) and the second pin (439) are located in the second mounting cavity; The second cover (454) is provided on the opening side of the second mounting cavity; The second connector (456) passes through the second body (452) and the second cover (454) to fix the second body (452) and the second cover (454).

6. The traction converter according to claim 2, characterized in that, The first housing (410) includes: The first body (412) is provided with a first mounting cavity, and the circuit board (420) and the plurality of optical modules (430) are disposed in the first mounting cavity; The first cover (414) is provided on the opening side of the first mounting cavity; The first connector (416) passes through the first cover (414) and the first body (412) to fix the first cover (414) and the first body (412).

7. The traction converter according to claim 6, characterized in that, Also includes: A cable guide sleeve (600) is sandwiched between the first body (412) and the first cover (414), located on the side of the first body (412) away from the connector (440). The cable guide sleeve (600) is provided with a plurality of cable guide holes (610) and a plurality of slots (620). The plurality of slots (620) are respectively connected to the plurality of cable guide holes (610), and the slots (620) extend from the cable guide holes (610) to the edge of the cable guide sleeve (600). A plurality of optical fibers (500) pass through the cable guide holes (610).

8. The traction converter according to claim 7, characterized in that, The diameter of the through hole (610) is smaller than the diameter of the optical fiber (500).

9. The traction converter according to claim 6, characterized in that, The inner side of the first cover (414) is provided with a plurality of protrusions (418), and the plurality of protrusions (418) abut against the optical module (430).

10. The traction converter according to any one of claims 1 to 9, characterized in that, The power unit (200) is multiple, and the multiple connector assemblies (400) include: A first connector assembly (460) is connected to the control unit (100); The second connector assembly (470) is connected to one of the power units (200) of the plurality of power units (200), and the optical module (430) of the second connector assembly (470) is connected to a portion of the optical modules (430) of the plurality of optical modules (430) of the first connector assembly (460) via the optical fiber (500). A third connector assembly (480) is connected to another power unit (200) of the plurality of power units (200), and the optical module (430) of the third connector assembly (480) is connected to another portion of the optical modules (430) of the plurality of optical modules (430) of the first connector assembly (460) via the optical fiber (500).

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