Locomotive auxiliary electrical cabinet

Abstract

The invention provides a locomotive auxiliary electrical cabinet, and relates to the technical field of rail transit. The locomotive auxiliary electrical cabinet comprises a cabinet body, and a first power module chamber, a second power module chamber, an input / output chamber and an open chamber which are arranged in the cabinet body. Wherein the input and output chamber is located at the corner of the cabinet body, and the input and output chamber is provided with a first side and a second side which are adjacent; the first power module chamber is arranged close to the first side of the input / output chamber and extends in a first direction in the plane direction of the cabinet body; one of the open chamber and the second power module chamber is arranged close to the second side of the input / output chamber and extends in a second direction in the plane direction of the cabinet body; the first direction is perpendicular to the second direction; and the open chamber and the second power module chamber are oppositely and closely arranged in the first direction. According to the locomotive auxiliary electrical cabinet, through modular design and reasonable layout of the power modules and the magnetic elements, the locomotive auxiliary electrical cabinet which is high in modular degree, light in weight and efficient is provided.

Description

Technical Field

[0001] The present application relates to the field of rail transit technology, and in particular to a locomotive auxiliary electrical cabinet. Background Art

[0002] The locomotive auxiliary electrical cabinet is a railway locomotive equipment dedicated to the management and distribution of electricity. It can mainly supply power to AC loads such as air compressors, ventilators, air conditioners, dust removal fans, power room equipment, cooling fans, and DC loads such as chargers on the locomotive. Since the locomotive auxiliary electrical cabinet is usually designed inside the rail locomotive, the internal space of the locomotive is limited, and the design of the electrical cabinet needs to be as compact as possible. At the same time, the impact of the weight of the electrical cabinet on the overall performance of the locomotive must also be considered.

[0003] The existing locomotive auxiliary electrical cabinet occupies a large space, has poor module integration and lacks small and lightweight design. In addition, due to the loose internal design of the locomotive auxiliary electrical cabinet, the resonance parameters may be affected when achieving resonant operation, thereby affecting the resonant frequency, switching loss and impedance, and further affecting the circuit efficiency and overall performance.

[0004] In order to solve the above problems, there is an urgent need for a locomotive auxiliary electrical cabinet that is highly modular, lightweight and efficient. Summary of the invention

[0005] The present application provides a locomotive auxiliary electrical cabinet, which provides a locomotive auxiliary electrical cabinet with high modularity, light weight and high efficiency through modular design and reasonable layout of each module and magnetic elements.

[0006] The present application provides a locomotive auxiliary electrical cabinet, comprising: a cabinet body and a first power module room, a second power module room, an input-output room and an open room arranged in the cabinet body; a high-frequency transformer and a DC filter inductor are arranged in the open room; an auxiliary inverter module and a charger module are arranged in the first power module room; a chopper step-down module and a high-frequency isolation module are arranged in the second power module room; wherein the input-output room is located at a corner of the cabinet body, and the input-output room has an adjacent first side and a second side; the first power module room is arranged adjacent to the first side of the input-output room and extends in a first direction in the plane direction of the cabinet body; one of the open room and the second power module room is arranged adjacent to the second side of the input-output room and extends in a second direction in the plane direction of the cabinet body; the first direction is perpendicular to the second direction; and the open room and the second power module room are arranged adjacent to each other in the first direction with their backs to each other.

[0007] In a possible implementation, the open chamber is disposed adjacent to the second side of the input / output chamber; and the second power module chamber extends in the second direction from a side away from the input / output chamber toward a side close to the input / output chamber.

[0008] In a possible implementation, the second power module chamber includes at least one chopper buck module and at least one high-frequency isolation module; the high-frequency isolation module and the chopper buck module are arranged in layers up and down along the height direction of the cabinet.

[0009] In a possible implementation, the high-frequency isolation module is arranged above the chopping buck module; the high-frequency isolation module includes a first high-frequency isolation module and a second high-frequency isolation module, and the first high-frequency isolation module and the second high-frequency isolation module are arranged side by side; the chopping buck module includes a first chopping buck module and a second chopping buck module, and the first chopping buck module and the second chopping buck module are arranged side by side.

[0010] In a possible implementation manner, the high-frequency transformer and the DC filter reactor are arranged in layers up and down along the height direction.

[0011] In a possible implementation, a high-frequency transformer is arranged above a DC filter inductor; the high-frequency transformer includes a first high-frequency transformer, a second high-frequency transformer, a third high-frequency transformer, and a fourth high-frequency transformer arranged side by side along a second direction; the DC filter inductor includes a first DC filter inductor, a second DC filter inductor, a third DC filter inductor, and a fourth DC filter inductor arranged side by side along the second direction.

[0012] In a possible implementation, an AC filter reactor, an input DC filter reactor and a three-phase transformer are also provided in the open chamber; the input DC filter reactor and the three-phase transformer are arranged below the DC filter reactor; the AC filter reactor, the input DC filter reactor and the three-phase transformer are spaced apart in the first direction.

[0013] In one possible implementation, the chopper step-down module includes a three-level step-down chopper circuit and a filter circuit; the input end of the three-level step-down chopper circuit is connected to the output end of the input DC filter inductor, the output end of the three-level step-down chopper circuit is connected to the input end of the chopper inductor, and the output end of the DC filter inductor is connected to the input end of the filter circuit.

[0014] In a possible implementation, the chopper step-down module further includes a voltage detection circuit and an overvoltage discharge protection circuit; the voltage detection circuit and the overvoltage discharge protection circuit are respectively connected in parallel with the filter circuit.

[0015] In a possible implementation manner, the three-level step-down chopper circuit includes a power device IGBT, an input-end support capacitor, and a slow-release resistor.

[0016] In a possible implementation, the high-frequency isolation module includes an LLC full-bridge inverter circuit, and the LLC full-bridge inverter circuit includes an input support capacitor, a power device IGBT, a rectifier diode, a thick film resistor, a resonant capacitor, and an output support capacitor.

[0017] In a possible implementation, the high-frequency isolation module further includes a current detection circuit, and the current detection circuit is connected in series with the LLC full-bridge inverter circuit.

[0018] In a possible implementation, the locomotive auxiliary electrical cabinet is provided with two groups of DC input terminals, the DC input terminals include a first DC input and a second DC input; the first DC input includes a traction converter intermediate DC bus, and the second DC input includes a power battery; the locomotive auxiliary electrical cabinet is connected to the traction converter intermediate DC bus, and at the same time, the locomotive auxiliary electrical cabinet is disconnected from the power battery; or, the locomotive auxiliary electrical cabinet is connected to the power battery, and at the same time, the locomotive auxiliary electrical cabinet is disconnected from the traction converter intermediate DC bus.

[0019] In a possible embodiment, at least one air inlet is provided at the bottom of the cabinet; the air inlet is connected to the ventilation device; at least one heat dissipation outlet is provided on the side wall of the cabinet; the heat dissipation outlet is connected to the outside, and the heat dissipation outlet is opposite to the open chamber in a first direction.

[0020] In a possible embodiment, the air inlet includes a first air inlet and a second air inlet, and a first air inlet channel and a second air inlet channel are arranged at the bottom of the cabinet, the first air inlet channel is connected to the first air inlet, and the second air inlet channel is connected to the second air inlet; a heat dissipation air duct is arranged in the first power module room, the bottom end of the heat dissipation air duct is connected to the first air inlet channel, and the top end of the heat dissipation air duct is connected to the top space of the first power module room; an air guide channel is arranged in the second power module room, the bottom end of the air guide channel is connected to the second air inlet channel, and the top end of the air guide channel is connected to the top space of the second power module room.

[0021] In a possible embodiment, the first air inlet channel is provided with a first air outlet and a second air outlet, the heat dissipation duct includes a left heat dissipation duct and a right heat dissipation duct arranged side by side, the left heat dissipation duct is connected to the first air outlet, and the right heat dissipation duct is connected to the second air outlet; the second air inlet channel is provided with a third air outlet and a fourth air outlet, the air guide channel includes a left air guide channel and a right air guide channel arranged side by side, the left air guide channel is connected to the third air outlet, and the right air guide channel is connected to the fourth air outlet.

[0022] In a possible embodiment, the heat dissipation duct is mounted on the side wall of the first power module chamber, and at least one side air outlet is provided on the side wall of the heat dissipation duct facing away from the first power module chamber; the air guide channel is mounted on the side wall of the second power module chamber, and at least one side air outlet is provided on the side wall of the air guide channel facing away from the second power module chamber.

[0023] The locomotive auxiliary electrical cabinet provided by the present application includes a cabinet body and a first power module room, a second power module room, an input-output room and an open room arranged in the cabinet body. A high-frequency transformer and a DC filter reactor are arranged in the open room, an auxiliary inverter module and a charger module are arranged in the first power module room, and a chopper step-down module and a high-frequency isolation module are arranged in the second power module room. Among them, the input-output room is located at the corner of the cabinet body, the first power module room is arranged adjacent to the first side of the input-output room, and extends in the first direction in the plane direction of the cabinet body, and the open room and the second power module room are arranged adjacent to the second side of the input-output room, and extend in the second direction in the plane direction of the cabinet body, and the first direction is perpendicular to the second direction. In addition, the open room and the second power module room are arranged back to back in the first direction. By using high-frequency isolation technology, the present application replaces the traditional high-power power frequency transformer with a light-weight and small-volume high-frequency transformer, thereby reducing the weight of electrical components. In addition, the modular integrated design is adopted in the structure to realize the generalization of components, reduce the number of parts, and realize the design of a lightweight and efficient locomotive auxiliary electrical cabinet. At the same time, through the reasonable layout of each module and magnetic components, the chopper step-down module and the high-frequency isolation module room are arranged back to back and close to the open room, so that the power module and electrical components are compactly distributed, while reducing the possibility of changes in the resonance cavity parameters, thereby improving the efficiency and reliability of the electrical cabinet operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A top view of a locomotive auxiliary electrical cabinet provided in an embodiment of the present application;

[0026] Figure 2 A left side view of a locomotive auxiliary electrical cabinet provided in an embodiment of the present application;

[0027] Figure 3 A right side view of a locomotive auxiliary electrical cabinet provided in an embodiment of the present application;

[0028] Figure 4A front view of a locomotive auxiliary electrical cabinet provided in an embodiment of the present application;

[0029] Figure 5 A schematic block diagram of the overall circuit of a locomotive auxiliary electrical cabinet provided in an embodiment of the present application;

[0030] Figure 6 A schematic diagram of the DC conversion circuit structure of a locomotive auxiliary electrical cabinet provided in an embodiment of the present application;

[0031] Figure 7 A schematic diagram of the circuit structure of a chopper buck module provided in an embodiment of the present application;

[0032] Figure 8 A bottom view of a locomotive auxiliary electrical cabinet provided in an embodiment of the present application;

[0033] Fig. 9 The locomotive auxiliary electrical cabinet provided in the embodiment of the present application includes a right view of the cabinet side wall;

[0034] Fig.10 A schematic diagram of the structure of a locomotive auxiliary electrical cabinet provided in an embodiment of the present application at one viewing angle;

[0035] Fig.11 A schematic diagram of the structure of a locomotive auxiliary electrical cabinet provided in an embodiment of the present application from another perspective.

[0036] Description of reference numerals:

[0037] 10. Cabinet; 11. First air inlet; 12. Second air inlet; 13. First heat dissipation outlet; 14. Second heat dissipation outlet; 15. First air inlet channel; 16. Second air inlet channel; 17. Heat dissipation duct; 171. Left heat dissipation duct; 172. Right heat dissipation duct; 18. Air guide channel; 181. Left air guide channel; 182. Right air guide channel;

[0038] 100. Input and output room;

[0039] 200, first power module chamber; 210, auxiliary inverter module; 211, first auxiliary inverter module; 212, second auxiliary inverter module; 213, third auxiliary inverter module; 214, fourth auxiliary inverter module; 215, fifth auxiliary inverter module; 216, sixth auxiliary inverter module; 220, charger module;

[0040] 300, open room; 310, high frequency transformer; 311, first high frequency transformer; 312, second high frequency transformer; 313, third high frequency transformer; 314, fourth high frequency transformer; 320, DC filter reactor; 321, first DC filter reactor; 322, second DC filter reactor; 323, third DC filter reactor; 324, fourth DC filter reactor; 330, input DC filter reactor; 331, first input DC filter reactor; 332, second input DC filter reactor; 340, AC filter reactor; 350, three-phase transformer;

[0041] 400, second power module chamber; 410, chopper buck module; 411, first chopper buck module; 4111, first three-level buck chopper circuit; 4112, first filter circuit; 4113, first overvoltage discharge protection circuit; 4114, first voltage detection circuit; 412, second chopper buck module; 4121, second three-level buck chopper circuit; 4122, second filter circuit; 4123, second overvoltage discharge protection circuit; 4124, second voltage detection circuit;

[0042] 420, high-frequency isolation module; 421, first high-frequency isolation module; 422, second high-frequency isolation module;

[0043] 500. Control unit room; 510. Circuit breaker assembly; 520. Control unit. DETAILED DESCRIPTION

[0044] The locomotive auxiliary electrical cabinet is a key component of railway locomotive equipment dedicated to managing and distributing electricity. It can mainly supply power to AC loads such as air compressors, ventilators, air conditioners, dust removal fans, power room equipment, cooling fans, and DC loads such as chargers on the locomotive. Since the locomotive auxiliary electrical cabinet is usually designed inside the rail locomotive, its design needs to adapt to the space limitations inside the locomotive, while ensuring the reasonable layout of internal components for easy maintenance and repair. Not only does the design of the electrical cabinet need to be as compact as possible, but the impact of the weight of the electrical cabinet on the overall performance of the locomotive must also be considered.

[0045] The existing locomotive auxiliary electrical cabinets occupy a large space, have poor module integration and lack of small and lightweight design. In addition, in terms of structural distribution, due to the loose internal design of the locomotive auxiliary electrical cabinet, especially the high-frequency auxiliary DC conversion part, the power module and the high-frequency transformer are far apart. When achieving resonant operation, the line inductance affects the resonant parameters, which in turn affects the resonant frequency, switching loss and impedance, and further affects the circuit efficiency and overall performance.

[0046] In view of this, an embodiment of the present application provides a locomotive auxiliary electrical cabinet, including a cabinet body and a first power module room, a second power module room, an input / output room, and an open room arranged in the cabinet body. A high-frequency transformer and a DC filter reactor are arranged in the open room, an auxiliary inverter module and a charger module are arranged in the first power module room, and a chopper step-down module and a high-frequency isolation module are arranged in the second power module room.

[0047] The input / output chamber is located at a corner of the cabinet, and the input / output chamber has a first side and a second side adjacent to each other. The first power module chamber is arranged adjacent to the first side of the input / output chamber and extends in a first direction in the plane direction of the cabinet. One of the open chamber and the second power module chamber is arranged adjacent to the second side of the input / output chamber and extends in a second direction in the plane direction of the cabinet. The first direction is perpendicular to the second direction, and the open chamber and the second power module chamber are arranged adjacent to each other in the first direction facing away from each other.

[0048] This application uses high-frequency isolation technology to replace traditional high-power power frequency transformers with light-weight, small-volume high-frequency transformers, thereby reducing the weight of electrical components. In addition, a modular integrated design is used in the structure to achieve component commonality, reduce the number of parts, and achieve a lightweight and efficient locomotive auxiliary electrical cabinet design. At the same time, through the reasonable layout of each module and magnetic element, the chopper step-down module and the high-frequency isolation module chamber are arranged back to back and adjacent to the open chamber, so that the power module and electrical components are compactly distributed, while also reducing the possibility of changes in the resonance cavity parameters, and improving the efficiency and reliability of the electrical cabinet operation.

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] Figure 1 A top view of a locomotive auxiliary electrical cabinet provided in an embodiment of the present application. Figure 2 This is a left view of the locomotive auxiliary electrical cabinet provided in an embodiment of the present application. Figure 3 This is a right view of the locomotive auxiliary electrical cabinet provided in the embodiment of the present application. It should be noted that in order to facilitate the observation of the internal assembly of the locomotive auxiliary electrical cabinet, Figures 1 to 3 Part of the cabinet is cut open to expose the internal electrical components.

[0051] Reference Figures 1 to 3As shown, the embodiment of the present application provides a locomotive auxiliary electrical cabinet, including a cabinet 10 and an input / output chamber 100, a first power module chamber 200, an open chamber 300, and a second power module chamber 400 arranged in the cabinet 10. An auxiliary inverter module 210 and a charger module 220 are arranged in the first power module chamber 200, and a chopper step-down module 410 and a high-frequency isolation module 420 are arranged in the second power module chamber 400. A high-frequency transformer 310 and a DC filter reactor 320 are arranged in the open chamber 300.

[0052] Specifically, the chopper step-down module 410 is used to step down the voltage input to the DC input terminal of the locomotive auxiliary electrical cabinet. The high-frequency isolation module 420 further steps down the DC bus voltage output by the chopper step-down module 410, and provides a stable DC power supply for the subsequent auxiliary inverter module 210 and charger module 220, chopper excitation module, etc. The high-frequency transformer 310 is used to achieve electrical isolation between the input and output of the DC converter.

[0053] The input / output chamber 100 is located at a corner of the cabinet 10. Two adjacent side walls of the input / output chamber 100 can be directly used as a part of the adjacent outer side walls of the cabinet 10. The other two adjacent sides of the input / output chamber 100 are adjacent to other chambers. For ease of description, the present embodiment defines the adjacent two sides of the input / output chamber 100 as the first side and the second side thereof. Figure 1 The coordinate system is set in the coordinate system, wherein the first side of the input / output chamber 100 is a side along the x-axis direction of the coordinate system, and the second side of the input / output chamber 100 is a side along the y-axis direction of the coordinate system.

[0054] The first power module chamber 200 is disposed adjacent to a first side of the input / output chamber 100 and extends in a first direction in the plane direction of the cabinet 10. One of the open chamber 300 and the second power module chamber 400 is disposed adjacent to a second side of the input / output chamber 100 and extends in a second direction in the plane direction of the cabinet 10. The first direction is perpendicular to the second direction, and the open chamber 300 and the second power module chamber 400 are disposed adjacent to each other in opposite directions in the first direction.

[0055] like Figure 1 As shown, the locomotive auxiliary electrical cabinet further includes a control unit room 500 disposed in the cabinet body 10, and a circuit breaker assembly 510 and a control unit 520 are disposed in the control unit room 500. The control unit room 500 is disposed at the other side corner of the input and output room 100 along the first direction in the plane direction. It should be noted that the position of the control unit room 500 can be adaptively adjusted according to the size of the space occupied by each module, and is not specifically limited here.

[0056] In this way, high-frequency isolation technology is used to replace the traditional high-power power frequency transformer with a light-weight and small-volume high-frequency transformer, thereby reducing the weight of electrical components. At the same time, the modules containing power components are integrated to reduce the number of parts and realize the universalization of components. The internal space setting of the locomotive auxiliary electrical cabinet is saved, and a lightweight and efficient locomotive auxiliary electrical cabinet design is realized. At the same time, through the above reasonable layout of each module and magnetic element, the chopper step-down module 410 and the high-frequency isolation module 420 are arranged back to back and adjacent to the open chamber 300, reducing the installation position distance between the high-frequency isolation module 420 and the high-frequency transformer 310. The line inductance is reduced, avoiding the change of the resonance cavity parameters caused by the line inductance being too large. While the power module and the electrical components are compactly distributed, the possibility of the change of the resonance cavity parameters is also reduced, and the efficiency and reliability of the operation of the electrical cabinet are improved.

[0057] For example, Figure 1 As shown, the open chamber 300 is disposed adjacent to the second side of the input / output chamber 100. At this time, the open chamber 300 is disposed on the second side of the input / output chamber 100, and the second power module chamber 400 is disposed on the opposite side of the open chamber 300. The second power module chamber 400 extends in the second direction from the side away from the input / output chamber 100 toward the side close to the input / output chamber 100.

[0058] This setting ensures the parameter performance of DC / DC conversion. Figure 1 Taking the paper direction shown in the figure as an example, the chopper step-down module 410 and the high-frequency isolation module 420 are distributed to the right side of the cabinet 10 in terms of structural distribution, and the magnetic component high-frequency transformer 310 is distributed to the left side of the cabinet 10. The distance between the right and left sides of the cabinet is close, and the cable of the high-frequency transformer 310 is connected to the terminal of the high-frequency isolation module 420 through the threading hole of the cabinet 10. The maximum distance of the primary cable of the transformer is 1400mm, and the maximum distance of the secondary cable is 1100mm. The high-frequency transformer 310 operates at a frequency of 18~20kHz. Ordinary cables will produce a strong skin efficiency. The primary and secondary cables of the transformer use Litz wire, which is equivalent to a high-frequency cable. The primary cable length and secondary cable length of the four transformers must be consistent, so that the parameters of the four transformers are consistent and within the design tolerance range. In addition, such a setting is also conducive to the realization of the heat dissipation requirements in the auxiliary electrical cabinet of the locomotive described later.

[0059] In some embodiments, Figure 2As shown, the second power module chamber 400 includes at least one chopper buck module 410 and at least one high-frequency isolation module 420. The high-frequency isolation module 420 and the chopper buck module 410 are arranged in layers up and down along the height direction of the cabinet 10. It should be noted that the specific positions of the high-frequency isolation module 420 and the chopper buck module 410 are not limited here. The high-frequency isolation module 420 can be placed on the upper layer of the chopper buck module 410 in the height direction, or on the lower layer of the chopper buck module 410 in the height direction. The number of the chopper buck module 410 and the high-frequency isolation module 420 is not specifically limited here, and can be adjusted according to specific circuit design requirements.

[0060] As an implementation, the high-frequency isolation module 420 is arranged above the chopper buck module 410. The high-frequency isolation module 420 includes a first high-frequency isolation module 421 and a second high-frequency isolation module 422, and the first high-frequency isolation module 421 and the second high-frequency isolation module 422 are arranged side by side. The chopper buck module 410 includes a first chopper buck module 411 and a second chopper buck module 412, and the first chopper buck module 411 and the second chopper buck module 412 are arranged side by side. Such an arrangement can maximize the use of the space in the locomotive auxiliary electrical cabinet and achieve an overall lightweight design.

[0061] The disassembly and assembly method of the chopper buck module 410 can be an upper slide push-pull type. Its radiator substrate is also the mounting surface of the chopper buck module 410. The radiator substrate is provided with mounting holes, and fasteners pass through the mounting holes to connect the chopper buck module 410 to the air duct set on the cabinet. The chopper buck module 410 is provided with a slide rail on the top, and the top frame is designed with mounting holes, which can assist in fixing the chopper buck module 410 in the direction of gravity.

[0062] For easy maintenance, the chopper buck power module 410 is installed from the side of the cabinet 10. After the chopper buck power module 410 is pushed into the cabinet from the side of the cabinet 10 through the slide, it is fastened to the air duct with M8 bolts through the six 10×14 oblong holes set on the heat sink substrate. At the same time, the two 10×14 oblong holes set on the frame of the chopper buck power module 410 are fastened to the cabinet slide with M8 bolts. The module dimensions are: 468mm×483mm×520mm.

[0063] The high-frequency isolation module 420 is disassembled and assembled in a push-pull manner using a lower slide rail. The heat sink substrate is also the mounting surface of the high-frequency isolation module 420. The heat sink substrate is provided with mounting holes, and fasteners pass through the mounting holes to connect the air duct provided on the cabinet of the high-frequency isolation module 420. A slide rail is provided at the bottom of the high-frequency isolation module 420, and mounting holes are designed on the bottom frame of the high-frequency isolation module 420, which can assist in fixing the high-frequency isolation module 420 in the direction of gravity.

[0064] The high-frequency isolation module 420 is installed from the side of the cabinet 10. After the module is lifted with a tool, it is pushed in along the internal slide rail of the cabinet 10. Six 12×17 oblong holes are set on the heat sink substrate of the high-frequency isolation module 420. After the high-frequency isolation module 420 is pushed into the box, it is fixed to the air duct through these six through holes with M10 bolts. In addition, two 10×14 oblong holes are set at the bottom of the frame of the high-frequency isolation module 420, which are fixed to the cabinet frame with M8 bolts. The module dimensions are: 480 mm×800mm×460 mm.

[0065] As an implementation method, Figure 3 As shown, the high-frequency transformer 310 and the DC filter reactor 320 in the open room 300 can be arranged in layers up and down along the height direction of the cabinet body so as to realize the utilization of the space in the cabinet. It should be noted that the specific positions of the high-frequency transformer 310 and the DC filter reactor 320 are not limited here. The high-frequency transformer 310 can be placed on the upper layer of the DC filter reactor 320 in the height direction, and can also be placed on the lower layer of the DC filter reactor 320 in the height direction. Specifically, the DC filter reactor 320 is installed vertically and has strong stability. The DC filter reactor 320 can be designed with an aluminum coil, which is about 3kg lighter than a copper coil.

[0066] For example, at this time, the high-frequency transformer 310 can be placed on the upper layer in the height direction of the DC filter reactor 320. In this way, the high-frequency transformer 310 and the high-frequency isolation module 420 can be placed at a close height to minimize the distance between them and reduce the negative impact caused by line inductance.

[0067] As another implementation, the high frequency isolation module 420 can also be disposed below the chopper buck module 410. Correspondingly, the high frequency transformer 310 can be placed below the DC filter reactor 320 in the height direction to minimize the line inductance, which will not be described in detail here.

[0068] In some embodiments, the high frequency transformer 310 includes a first high frequency transformer 311, a second high frequency transformer 312, a third high frequency transformer 313, and a fourth high frequency transformer 314 arranged side by side along the second direction. The DC filter reactor 320 includes a first DC filter reactor 321, a second DC filter reactor 322, a third DC filter reactor 323, and a fourth DC filter reactor 324 arranged side by side along the second direction.

[0069] Specifically, the open chamber 300 can be divided into two columns, and two DC filter reactors 320 arranged side by side in each column are connected in series to be used by the corresponding high-frequency isolation module 420. Figure 3Taking the paper direction shown in FIG. 1 as an example, the first DC filter reactor 321 and the second DC filter reactor 322 connected in series on the right side are used by the first high-frequency isolation module 421. The third DC filter reactor 323 and the fourth DC filter reactor 324 connected in series on the left side are used by the second high-frequency isolation module 422. Such a setting can maximize the space utilization by arranging side by side.

[0070] As an embodiment, an AC filter reactor 340, an input DC filter reactor 330 and a three-phase transformer 350 are also provided in the open chamber 300. The input DC filter reactor 330 and the three-phase transformer 350 are provided below the DC filter reactor 320, and the AC filter reactor 340, the input DC filter reactor 330 and the three-phase transformer 350 are spaced apart in the first direction. By staggering the input DC filter reactor 330, the AC filter reactor 340 and the three-phase transformer 350 in the first direction, the space occupied in the open chamber 300 can be saved. It should be noted that the input DC filter reactor 330 and the three-phase transformer 350 can be provided directly below the DC filter reactor 320, or can be provided at the side and lower side of the DC filter reactor 320, and can be adjusted according to the number and size of the magnetic elements and the remaining space in the open chamber, which is not specifically limited here.

[0071] As an implementation mode, the internal coils of the DC filter reactor 330 and the AC filter reactor 340 on the load side may be designed to be aluminum coils to further reduce the weight of the components.

[0072] Figure 4 This is a front view of the locomotive auxiliary electrical cabinet provided in the embodiment of the present application. Figure 4 As shown, an auxiliary inverter module 210 and a charger module 220 are disposed in the first power module chamber 200. Specifically, according to the load condition, the auxiliary inverter module 210 includes a first auxiliary inverter module 211, a second auxiliary inverter module 212, a third auxiliary inverter module 213, a fourth auxiliary inverter module 214, a fifth auxiliary inverter module 215 and a sixth auxiliary inverter module 216.

[0073] According to the space occupied by the auxiliary inverter module 210 and the overall size of the electrical cabinet, the first power module chamber 200 can be divided into two columns. Figure 4 Taking the paper direction shown in FIG. 2 as an example, the left column can be layered with the first auxiliary inverter module 211, the second auxiliary inverter module 212, the third auxiliary inverter module 213, and the fourth auxiliary inverter module 214 along the height direction of the cabinet 10. The right column is placed with the fifth auxiliary inverter module 215, the sixth auxiliary inverter module 216, and the charger module 220. In this way, the module integration is high and the space utilization rate in the first power module room 200 is maximized.

[0074] Exemplarily, the auxiliary inverter module 210 is composed of IGBT power devices, voltage and current sensors, a composite busbar, supporting capacitors, slow discharge resistors, a drive board and a heat sink. The auxiliary inverter module 210 can be installed vertically and the connector can be plugged in and out. The end face is equipped with a support frame for easy disassembly and maintenance.

[0075] Specifically, the charger module 220 is composed of a control board, a drive board, a DCAC circuit board, an isolation transformer, a rectifier circuit board, an LC filter component, etc. The overall structure is simple and easy to install, and has good heat dissipation. The charger can adopt constant current, constant voltage, floating charge and other charging methods, has a battery management system BMS function, and can output voltage according to the battery charging characteristic curve.

[0076] Figure 5 This is a schematic block diagram of the overall circuit of the locomotive auxiliary electrical cabinet provided in the embodiment of the present application. Figure 5 As shown, as an implementation mode, the locomotive auxiliary electrical cabinet is provided with two sets of DC input terminals, and the DC input terminals include a first DC input and a second DC input. The first DC input includes a traction converter intermediate DC bus, and the second DC input includes a power battery. The locomotive auxiliary electrical cabinet is connected to the traction converter intermediate DC bus, and at the same time, the locomotive auxiliary electrical cabinet is disconnected from the power battery. Alternatively, the locomotive auxiliary electrical cabinet is connected to the power battery, and at the same time, the locomotive auxiliary electrical cabinet is disconnected from the traction converter intermediate DC bus.

[0077] The two groups of inputs of the locomotive auxiliary electrical cabinet do not interfere with each other. Each group contains two types of inputs. The first group of locomotive auxiliary electrical cabinet DC inputs is composed of the first traction converter intermediate DC bus and the first power battery, which maintain a complementary state. When the first traction converter intermediate DC bus supplies power, the first power battery does not work. When the first power battery supplies power, the first traction converter intermediate DC bus does not work.

[0078] The second group of locomotive auxiliary electrical cabinet DC input is composed of the second traction converter intermediate DC bus and the second power battery, which maintain a complementary state. When the second traction converter intermediate DC bus supplies power, the second power battery does not work. When the second power battery supplies power, the second traction converter intermediate DC bus does not work. During the operation of the locomotive, especially when the vehicle runs at a low speed and starts and stops frequently, the vehicle fuel is insufficient and will cause great pollution to the environment. At this time, the diesel engine is not suitable, the power battery starts to work, and the traction converter intermediate DC bus does not supply power, which can reduce pollution emissions.

[0079] This configuration provides two forms of power supply for the locomotive auxiliary electrical cabinet, which is consistent with the trend that more and more locomotives are using "diesel engine + power battery" to power the locomotive under the dual carbon goals, achieving the goal of energy-saving and environmentally friendly green locomotives. Setting up two sets of inputs at the same time also improves the redundancy of the locomotive system operation.

[0080] Specifically, after the locomotive auxiliary electrical cabinet is input from the DC input terminal, it passes through the DC / DC converter, first undergoes DC conversion and voltage reduction, and then uses isolated DC conversion to obtain the intermediate DC bus voltage. On the intermediate DC bus, the subsequent stage can be connected in parallel to auxiliary inverters, chargers, chopper excitation and other modules to power the AC loads and DC loads on the locomotive.

[0081] In the implementation of the circuit structure solution, the DC / DC converter is divided into two groups: a first DC / DC conversion circuit and a second DC / DC conversion circuit, which work in parallel. The first DC / DC conversion circuit and the second DC / DC conversion circuit have the same topological structure. Figure 6 A schematic diagram of the DC conversion circuit structure of a locomotive auxiliary electrical cabinet provided in an embodiment of the present application. Figure 7 This is a schematic diagram of the circuit structure of the chopper buck module provided in the embodiment of the present application. Figure 6 As shown, the single-group DC / DC conversion is mainly composed of an input fuse, an input DC filter reactor 330, a chopper reactor, a high-frequency transformer 310, a chopper step-down module 410, and a high-frequency isolation module 420. Among them, the chopper reactor includes two DC filter reactors 320 connected in series. The chopper reactor participates in the step-down chopper circuit and can also filter out high-frequency harmonics and pulsating currents in the input DC circuit. The high-frequency transformer 310 can provide electrical isolation between the input and output of the DC converter, ensure safety, prevent the propagation of electrical faults, and step down the input voltage to the required output voltage.

[0082] As an implementation method, Figure 6 and Figure 7As shown, the chopper and buck module 410 includes a three-level buck chopper circuit and a filter circuit, and the filter circuit is connected in parallel with the three-level buck chopper circuit. Among them, the three-level buck chopper circuit steps down the 1900V DC voltage of the locomotive auxiliary electrical cabinet DC input to 840V DC voltage. The input end of the three-level buck chopper circuit is connected to the output end of the input DC filter reactor 330, the output end of the three-level buck circuit is connected to the input end of the chopper reactor, and the output end of the DC filter reactor 320 is connected to the input end of the filter circuit. Specifically, the output end of the three-level buck circuit is connected to the input end of the two groups of DC filter reactors 320 connected in series. After the DC input voltage is chopped by the three-level buck, the wide voltage input is converted into a stable DC voltage, and the filter circuit includes a resistor and a capacitor connected in parallel, which can play a role in attenuating high-frequency signals in the circuit after chopping and bucking, that is, filtering.

[0083] For example, Figure 7 As shown, taking a single group as an example, the first chopper buck module 411 includes a first three-level buck circuit 4111 and a first filter circuit 4112. In some embodiments, the first chopper buck module 411 also includes a first voltage detection circuit 4114 and a first overvoltage discharge protection circuit 4113. The first voltage detection circuit 4114 and the first overvoltage discharge protection circuit 4113 are respectively connected in parallel with the first filter circuit 4112. Among them, the first voltage detection circuit 4114 can detect the output voltage in the first chopper buck module 411, and when the detection voltage exceeds the threshold, the first overvoltage discharge protection circuit 4113 is connected to work and the excess electric energy is quickly released. The first overvoltage discharge protection circuit 4113 includes an IGBT tube and a first protection circuit connected in series, and the first protection circuit includes a resistor and a diode connected in parallel, wherein the resistor has a small resistance value and can be quickly discharged after the IGBT is turned on. The protection circuit here can play a role in overvoltage suppression. When there is a large voltage, it can buy time for the protection action of the back-end high-frequency module and will not immediately break down the power devices in the high-frequency module, further optimizing the electrical performance of the system.

[0084] In some embodiments, the first chopper step-down module 411 may also be provided with a current sensor connected to the chopper reactor to provide overcurrent protection in the circuit.

[0085] Specifically, the three-level buck chopper circuit includes multiple power devices IGBT, input support capacitors and slow-release resistors. The buck chopper module 410 includes main components such as a heat sink, a power device IGBT, an input support capacitor, a frame, a composite busbar, a copper busbar, a drive component, a slow-release resistor, a current sensor, a voltage sensor, a switching power supply, and an output DC support capacitor. It should be noted that in order to reduce the turn-off voltage spike of the IGBT, the commutation circuit of the IGBT adopts a laminated busbar connection to reduce the line inductance.

[0086] Similarly, the second chopping buck module 412 includes a second three-level buck circuit 4121 and a second filter circuit 4122. In some embodiments, the second chopping buck module 412 also includes a second voltage detection circuit 4124 and a second overvoltage discharge protection circuit 4123. The second voltage detection circuit 4124 and the second overvoltage discharge protection circuit 4123 are respectively connected in parallel with the second filter circuit 4122. Among them, the second voltage detection circuit 4124 can detect the output voltage in the second chopping buck module 412, and when the detection voltage exceeds the threshold, the second overvoltage discharge protection circuit 4123 is connected to work, and the excess electric energy is quickly released. The second overvoltage discharge protection circuit 4123 includes an IGBT tube and a second protection circuit connected in series, and the second protection circuit includes a resistor and a diode connected in parallel, wherein the resistor has a small resistance value, and can be quickly discharged after the IGBT is turned on. The protection circuit here can play an overvoltage suppression role. When there is a large voltage, it strives for protection action time for the back-end high-frequency module, and will not immediately break down the power device in the high-frequency module, further optimizing the electrical performance of the system.

[0087] In some embodiments, the second chopper step-down module 412 may also be provided with a current sensor connected to the chopper reactor to provide overcurrent protection in the circuit.

[0088] In a possible implementation, the high-frequency isolation module 420 includes an LLC full-bridge inverter circuit. Specifically, the LLC full-bridge inverter circuit includes a two-level voltage-type inverter circuit, a resonant capacitor, a rectifier circuit, and an output filter circuit. Among them, the two-level voltage-type inverter circuit is used to invert the DC bus voltage into an AC voltage, and the resonant capacitor and the excitation inductance and leakage inductance in the high-frequency transformer 310 form an LLC resonant cavity for step-down, and the full-bridge rectifier circuit on the other side of the high-frequency transformer 310 converts the AC voltage into a DC voltage, flows through the output filter circuit for high-frequency filtering, and finally steps down the 840V of the DC bus to a stable DC voltage of 700V, providing a stable DC power supply for the auxiliary inverter module and charger module, chopper excitation module, etc. of the subsequent stage.

[0089] The full-bridge rectifier circuit consists of two groups of diodes connected in parallel, each group consists of two diodes connected in series, so that the current can be conducted in both the positive and negative half cycles of the AC input, improving the rectification efficiency. The output filter circuit includes output support capacitors and resistors, which filter the DC voltage after the step-down output, improving the signal quality and power supply performance.

[0090] Similarly, the high-frequency isolation module 420 is also designed to be divided into two groups, and the two groups work in parallel. The topological structures of the first high-frequency isolation module and the second high-frequency isolation module are completely consistent and have the above-mentioned settings, which will not be elaborated here.

[0091] This arrangement enables efficient energy conversion. Through the resonance principle, the LLC resonant cavity can achieve zero voltage switching (ZVS) or zero current switching (ZCS), thereby reducing switching losses and improving the efficiency of the converter.

[0092] In some embodiments, the LLC full-bridge inverter circuit includes an input support capacitor, a power device IGBT, a rectifier diode, a thick film resistor, a resonant capacitor, and an output support capacitor.

[0093] In a possible implementation, the high-frequency isolation module 410 further includes a current detection circuit, which is connected in series with the LLC full-bridge inverter circuit to implement overcurrent monitoring and protection thereof.

[0094] Specifically, the high-frequency isolation module 420 is mainly composed of input support capacitors, heat sinks, power device IGBTs, rectifier diodes, anti-reverse diodes, thick film resistors, resonant capacitors, output support capacitors, composite busbars, copper busbars, frames, current sensors, driver boards and other components.

[0095] Exemplarily, the auxiliary inverter module 210 adopts a two-level voltage-type inverter circuit, and the DC bus voltage is inverted into three-phase CVCF and VVVF AC power, which is used to power the locomotive AC auxiliary load. The charger module 220 adopts an isolated DC conversion circuit, which converts the input DC bus voltage into DC power, and outputs DC110V DC power to power DC loads such as control batteries, control and lighting, starter oil pumps, and fuel pumps. The control unit adopts a chassis-type design with a cooling fan installed on the top; the front panel of the chassis has a reserved external interface to facilitate product function upgrades and online maintenance.

[0096] Figure 8 A bottom view of a locomotive auxiliary electrical cabinet provided in an embodiment of the present application. Fig. 9 A right side view of the locomotive auxiliary electrical cabinet including the cabinet side wall provided in an embodiment of the present application.

[0097] like Figure 8 and Fig. 9 As shown, in some embodiments, at least one air inlet is provided at the bottom of the cabinet 10, and the air inlet is connected to the ventilation device, and the ventilation device provides cooling air to the inside of the cabinet 10 through the air inlet. At least one heat dissipation outlet is provided on the side wall of the cabinet 10, and the heat dissipation outlet is connected to the outside, and the heat dissipation outlet is opposite to the open room in the first direction. It should be noted that the cooling air here can be natural wind or cold wind.

[0098] By adopting the air cooling design, the problems caused by the complexity of the water cooling pipeline of the electrical cabinet and the dispersion of modules and components due to water cooling can be avoided, and the problems of difficult disassembly and assembly and poor maintainability caused by leakage can also be solved. At the same time, the heat dissipation outlet is arranged relative to the open chamber in the first direction so that the cooling air can finally pass through the magnetic components in the open chamber 300 with relatively low heat dissipation requirements, such as the high-frequency transformer 310, the DC filter reactor 320, the input DC filter reactor 330, the AC filter reactor 340 and the three-phase transformer 350, and finally flow out of the locomotive auxiliary electrical cabinet through the heat dissipation outlet.

[0099] In some embodiments, the heat dissipation outlet of the cabinet 10 includes a first heat dissipation outlet 13 and a second heat dissipation outlet 14. This arrangement can increase the contact area between the cabinet 10 and the outside, so that the hot air flowing from both sides of the open chamber 300 can be efficiently discharged, thereby improving the heat dissipation efficiency of the locomotive auxiliary electrical cabinet.

[0100] It should be noted that the positions of the air inlets and outlets can be arranged according to the specific interfaces of the electrical cabinet, and are not specifically limited here.

[0101] Fig.10 A schematic diagram of the structure of a locomotive auxiliary electrical cabinet from one perspective provided in an embodiment of the present application. Fig.11 A schematic diagram of the structure of the locomotive auxiliary electrical cabinet provided in the embodiment of the present application from another perspective. Fig.10 and Fig.11 As shown, the air inlet includes a first air inlet 11 and a second air inlet 12, and a first air inlet channel 15 and a second air inlet channel 16 are provided at the bottom of the cabinet 10, the first air inlet channel 15 is connected to the first air inlet 11, and the second air inlet channel 16 is connected to the second air inlet 12. A heat dissipation duct 17 is provided in the first power module chamber 200, the bottom end of the heat dissipation duct 17 is connected to the first air inlet channel 15, and the top end of the heat dissipation duct 17 is connected to the top space of the first power module chamber 200. An air guide channel 18 is provided in the second power module chamber 400, the bottom end of the air guide channel 18 is connected to the second air inlet channel 16, and the top end of the air guide channel 18 is connected to the top space of the second power module chamber 400.

[0102] It should be noted that the description of the heat dissipation duct 17 and the air guide channel 18 in the present application is for distinguishing the definitions. In fact, the functions of the two can be the same, and both can achieve air cooling of the corresponding power module.

[0103] Exemplarily, the first air inlet channel 15 is provided with a first air outlet and a second air outlet, and the heat dissipation duct 17 includes a left heat dissipation duct 171 and a right heat dissipation duct 172 arranged side by side, the left heat dissipation duct 171 is connected to the first air outlet, and the right heat dissipation duct 172 is connected to the second air outlet. The corresponding left heat dissipation duct 171 can provide cooling air for and cool the first auxiliary inverter module 211, the second auxiliary inverter module 212, the third auxiliary inverter module 213, and the fourth auxiliary inverter module 214 that are located in the left column and arranged in layers in the first power module chamber 200. The right heat dissipation duct 172 can provide cooling air for and cool the fifth auxiliary inverter module 215, the sixth auxiliary inverter module 216, and the charger module 220 that are located in the right column and arranged in layers in the first power module chamber 200 (see Figure 4 as shown).

[0104] Specifically, the cooling air enters the cabinet 10 from the first air inlet 11, and after entering the first air inlet channel 15, enters the corresponding left heat dissipation duct 171 and right heat dissipation duct 172 arranged side by side through the first air outlet and the second air outlet in the first air inlet channel 15, and then the cooling air in the left heat dissipation duct 171 passes through the fourth auxiliary inverter module 214, the third auxiliary inverter module 213, the second auxiliary inverter module 212 and the first auxiliary inverter module 211 in the first power module chamber 200 from the bottom of the cabinet 10 upward, and finally reaches the top space of the first power module chamber 200. The cooling air in the right heat dissipation duct 172 passes through the charger module 220, the sixth auxiliary inverter module 216 and the fifth auxiliary inverter module 215 in the first power module chamber 200 from the bottom of the cabinet 10 upward, and finally reaches the top space of the first power module chamber 200.

[0105] The second air inlet channel 16 is provided with a third air outlet and a fourth air outlet, and the air guide channel 18 includes a left air guide channel 181 and a right air guide channel 182 arranged side by side, the left air guide channel 181 is connected to the third air outlet, and the right air guide channel 182 is connected to the fourth air outlet. Correspondingly, the left air guide channel 181 can provide cooling air for the first chopper buck module 411 and the first high-frequency isolation module 421 in the left column of the second power module chamber 200 and cool them. The right air guide channel 182 can provide cooling air for the second chopper buck module 412 and the second high-frequency isolation module 422 in the right column of the second power module chamber 200 and cool them (see Figure 2 as shown).

[0106] Specifically, the cooling air enters the cabinet 10 from the second air inlet 12, and after entering the second air inlet channel 16, enters the corresponding left air guide channel 181 and the right air guide channel 182 arranged side by side through the third air outlet and the fourth air outlet in the second air inlet channel 16, and then the cooling air in the left air guide channel 181 passes through the first chopper buck module 411 and the first high-frequency isolation module 421 in the second power module chamber 400 from the bottom of the cabinet 10 upward, and finally reaches the top space of the second power module chamber 400. The cooling air in the right air guide channel 182 passes through the second chopper buck module 412 and the second high-frequency isolation module 422 in the second power module chamber 400 from the bottom of the cabinet 10 upward, and finally reaches the top space of the second power module chamber 400.

[0107] In a possible implementation, the heat dissipation duct 17 is mounted on the side wall of the first power module chamber 200, and at least one side air outlet is provided on the side wall of the heat dissipation duct 17 away from the first power module chamber 200. The air guide channel 18 is mounted on the side wall of the second power module chamber 400, and at least one side air outlet is provided on the side wall of the air guide channel 18 away from the second power module chamber 400.

[0108] Specifically, the cooling air can flow from the top outlet of the heat dissipation air duct 17 to the top space of the first power module chamber 200, or can flow from the side outlet to the open chamber 300 (see Fig.11 Similarly, the cooling air can flow from the top outlet of the air guide channel 18 to the top space of the second power module chamber 400, or from the side air outlet to the top space of the open chamber 300 (see Figure 1 and Fig.11 as shown).

[0109] After the cooling wind flowing out of the heat dissipation duct 17 and the air guide channel 18 converges to the top space of the first power module room 200 and the top space of the second power module room 400, it will be converged to the top space of the open room 300 under the effect of wind pressure, and will flow downward from the top of the open room 300, through the high-frequency transformer 310, DC filter reactor 320, AC filter reactor 340, three-phase transformer output 350 and input DC filter reactor 330 arranged in layers, and finally flow to the outside from the first heat dissipation outlet 13 and the second heat dissipation outlet 14. The air cooling and heat dissipation of the locomotive auxiliary electrical cabinet is realized.

[0110] This arrangement takes into account the different heat dissipation requirements of each module. The first power module chamber 200 and the second power module chamber 400 with high heat dissipation requirements are first separated for air cooling, and finally flow through the magnetic components in the open chamber 300 with low heat dissipation requirements, so that the heat in the cabinet 10 is brought out. The air duct design is simple and efficient.

[0111] It should be noted that each of the above power modules is embedded in the corresponding heat dissipation duct 17 and air guide duct 18 through the heat sink substrate. When the cooling air passes through the heat dissipation duct 17 and air guide duct 18, it will take away the heat in the module.

[0112] This application optimizes the design of components in the locomotive auxiliary electrical cabinet, the tight arrangement of each power module, and the busbar and copper busbar connection method between the modules, optimizes the wiring path of the transformer, and finally improves the efficiency of the DC conversion circuit, thereby realizing a lightweight and efficient locomotive auxiliary electrical cabinet that can be widely used in future green, energy-saving and environmentally friendly locomotives.

[0113] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A locomotive auxiliary electrical cabinet, characterized in that: include: A cabinet and a first power module room, a second power module room, an input / output room and an open room arranged in the cabinet; a high-frequency transformer and a DC filter reactor are arranged in the open room; an auxiliary inverter module and a charger module are arranged in the first power module room; a chopper step-down module and a high-frequency isolation module are arranged in the second power module room; Wherein, the input-output chamber is located at a corner of the cabinet, and the input-output chamber has an adjacent first side and a second side; the first power module chamber is arranged adjacent to the first side of the input-output chamber and extends in a first direction in the plane direction of the cabinet; one of the open chamber and the second power module chamber is arranged adjacent to the second side of the input-output chamber and extends in a second direction in the plane direction of the cabinet; the first direction is perpendicular to the second direction; and the open chamber and the second power module chamber are arranged adjacent to each other in the first direction facing back to back.

2. The locomotive auxiliary electrical cabinet according to claim 1, characterized in that: The open chamber is disposed adjacent to the second side of the input-output chamber; the second power module chamber extends in the second direction from a side away from the input-output chamber toward a side close to the input-output chamber.

3. The locomotive auxiliary electrical cabinet according to claim 1, characterized in that: The second power module chamber includes at least one chopper buck module and at least one high-frequency isolation module; the high-frequency isolation module and the chopper buck module are arranged in layers up and down along the height direction of the cabinet.

4. The locomotive auxiliary electrical cabinet according to claim 3, characterized in that: The high-frequency isolation module is arranged above the chopper step-down module; the high-frequency isolation module includes a first high-frequency isolation module and a second high-frequency isolation module, and the first high-frequency isolation module and the second high-frequency isolation module are arranged side by side; The chopping buck module includes a first chopping buck module and a second chopping buck module, and the first chopping buck module and the second chopping buck module are arranged side by side.

5. The locomotive auxiliary electrical cabinet according to claims 1-4, characterized in that: The high-frequency transformer and the DC filter reactor are arranged in layers up and down along the height direction.

6. The locomotive auxiliary electrical cabinet according to claim 5, characterized in that: The high-frequency transformer is arranged above the DC filter reactor; the high-frequency transformer comprises a first high-frequency transformer, a second high-frequency transformer, a third high-frequency transformer and a fourth high-frequency transformer arranged side by side along the second direction; The DC filter reactor includes a first DC filter reactor, a second DC filter reactor, a third DC filter reactor and a fourth DC filter reactor which are arranged side by side along the second direction.

7. The locomotive auxiliary electrical cabinet according to claim 6, characterized in that: The open room is also provided with an AC filter reactor, an input DC filter reactor and a three-phase transformer; The input DC filter reactor and the three-phase transformer are arranged below the DC filter reactor; The AC filter reactor, the input DC filter reactor, and the three-phase transformer are spaced apart in the first direction.

8. The locomotive auxiliary electrical cabinet according to any one of claims 1 to 4, characterized in that: The chopper buck module includes a three-level buck chopper circuit and a filter circuit; The input end of the three-level buck chopper circuit is connected to the output end of the input DC filter inductor, the output end of the three-level buck chopper circuit is connected to the input end of the DC filter inductor, and the output end of the DC filter inductor is connected to the input end of the filter circuit.

9. The locomotive auxiliary electrical cabinet according to claim 8, characterized in that: The chopper step-down module also includes a voltage detection circuit and an overvoltage discharge protection circuit; The voltage detection circuit and the overvoltage discharge protection circuit are respectively connected in parallel with the filter circuit.

10. The locomotive auxiliary electrical cabinet according to claim 8, characterized in that: The three-level step-down chopper circuit includes a power device IGBT, an input-end support capacitor and a slow-release resistor.

11. The locomotive auxiliary electrical cabinet according to any one of claims 1 to 4, characterized in that: The high-frequency isolation module includes an LLC full-bridge inverter circuit, and the LLC full-bridge inverter circuit includes an input support capacitor, a power device IGBT, a rectifier diode, a thick film resistor, a resonant capacitor, and an output support capacitor.

12. The locomotive auxiliary electrical cabinet according to claim 11, characterized in that: The high-frequency isolation module also includes a current detection circuit, and the current detection circuit is connected in series with the LLC full-bridge inverter circuit.

13. The locomotive auxiliary electrical cabinet according to any one of claims 1 to 4, characterized in that: The locomotive auxiliary electrical cabinet is provided with two sets of DC input terminals, and the DC input terminals include a first DC input and a second DC input; The first DC input includes a traction converter intermediate DC bus, and the second DC input includes a power battery; The locomotive auxiliary electrical cabinet is connected to the intermediate DC bus of the traction converter, and at the same time, the locomotive auxiliary electrical cabinet is disconnected from the power battery; Alternatively, the locomotive auxiliary electrical cabinet is connected to the power battery, and at the same time, the locomotive auxiliary electrical cabinet is disconnected from the traction converter intermediate DC bus.

14. The locomotive auxiliary electrical cabinet according to any one of claims 1 to 4, characterized in that: At least one air inlet is provided at the bottom of the cabinet; the air inlet is connected to the ventilation device; The cabinet side wall is provided with at least one heat dissipation outlet; the heat dissipation outlet is connected to the outside, and the heat dissipation outlet is opposite to the open chamber in the first direction.

15. The locomotive auxiliary electrical cabinet according to claim 14, characterized in that: The air inlet includes a first air inlet and a second air inlet, and the bottom of the cabinet is provided with a first air inlet channel and a second air inlet channel, the first air inlet channel is connected to the first air inlet, and the second air inlet channel is connected to the second air inlet; A heat dissipation duct is provided in the first power module chamber, the bottom end of the heat dissipation duct is communicated with the first air inlet channel, and the top end of the heat dissipation duct is communicated with the top space of the first power module chamber; An air guiding channel is provided in the second power module chamber, the bottom end of the air guiding channel is communicated with the second air inlet channel, and the top end of the air guiding channel is communicated with the top space of the second power module chamber.

16. The locomotive auxiliary electrical cabinet according to claim 15, characterized in that: The first air inlet channel is provided with a first air outlet and a second air outlet, the heat dissipation duct includes a left heat dissipation duct and a right heat dissipation duct arranged side by side, the left heat dissipation duct is connected to the first air outlet, and the right heat dissipation duct is connected to the second air outlet; The second air inlet channel is provided with a third air outlet and a fourth air outlet, and the air guide channel includes a left air guide channel and a right air guide channel arranged side by side, the left air guide channel is connected to the third air outlet, and the right air guide channel is connected to the fourth air outlet.

17. The locomotive auxiliary electrical cabinet according to claim 15, characterized in that: The heat dissipation duct is mounted on the side wall of the first power module chamber, and at least one side air outlet is opened on the side wall of the heat dissipation duct facing away from the first power module chamber; The air guide channel is mounted on a side wall of the second power module chamber, and at least one side air outlet is provided on a side wall of the air guide channel that is away from the second power module chamber.

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