A multi-voltage level integrated converter

Abstract

The application discloses a multi-voltage-grade integrated converter, which comprises a cabinet body, a plurality of mutually isolated cavities arranged in the cabinet body, at least one high-voltage converter module, at least one medium-voltage converter module and at least one low-voltage direct-current power supply component, which are respectively arranged in different cavities and used for receiving direct-current input of different voltage grades and outputting corresponding driving or power supply signals, a high-voltage contactor component and a medium-voltage contactor component arranged in corresponding cavities respectively and used for distributing external input high-voltage direct current and medium-voltage direct current to the high-voltage converter module, the medium-voltage converter module and the low-voltage power supply module, a heat dissipation system comprising heat dissipation components arranged in the cabinet body and at least two independent cooling pipeline warehouses, the cooling pipeline warehouses are connected to each heat generating module through sealing interfaces and constitute a plurality of cooling loops, and a high-voltage detection component used for monitoring residual electric quantity of a high-voltage direct-current loop and outputting a discharge state indication signal.

Description

Technical Field

[0001] This invention relates to an integrated converter with multiple voltage levels, belonging to the field of converter technology. Background Technology

[0002] As construction machinery develops towards green and low-carbon directions, the application of new energy construction machinery is becoming increasingly widespread. As a core component of new energy construction machinery, the requirements for inverters are also gradually increasing. High performance, multi-functionality, and integration have become new requirements.

[0003] Existing converters used in engineering machinery primarily rely on electric drive systems for their technology, and they face the following problems under current new requirements: 1. Limited Functionality. The normal operation of construction machinery relies on the coordinated operation of the traction drive system, hydraulic system, fan system, power distribution system, and low-voltage control system. Existing converters typically only have traction drive functionality, while the drive of hydraulic and other systems depends on the power take-off (PTO) or other separately configured auxiliary drive controllers. 2. Limited Voltage Levels. Construction machinery traction drive systems have high output power and typically use high bus voltages of 1100V and above; hydraulic and fan systems, influenced by factors such as upstream and downstream component matching, cost, and efficiency, typically use medium bus voltages of around 600V. Integrating functions based on existing converters would present challenges such as voltage matching difficulties and increased costs. At the same time, under the current new requirements for converters, the following new problems also exist: 1. Electromagnetic compatibility issues. The need for multiple functions results in two or more bus voltage levels inside the converter. Furthermore, due to differences in switching frequency and external load, the electromagnetic environment inside the converter deteriorates, increasing the risk of device interference. 2. Component Mixing and Insulation Risks. Component insulation is a decisive factor affecting the safety and environmental adaptability of converters. The insulation risk is lower between components of the same bus voltage level, but increases between components of different bus voltage levels. Under the requirements of multi-functionality and integration, the mixing of components within the converter poses a risk to insulation performance.

[0004] 3. Convenience and safety of maintenance. Multifunctional integrated multi-voltage level converters may present problems during maintenance, such as numerous functional modules, inconvenient operation, and increased risk of capacitor discharge and electric shock between the busbars. Summary of the Invention

[0005] The purpose of this invention is to overcome the risks of increased internal and external electromagnetic interference and low insulation caused by functional integration of existing converters, and to provide a multi-voltage level integrated converter that achieves multiple bus voltage levels, comprehensive functions, good electromagnetic compatibility and insulation performance, convenient maintenance and safe maintenance.

[0006] To achieve the above objectives / to solve the above technical problems, the present invention is implemented using the following technical solution: A multi-voltage level integrated converter includes: The cabinet has multiple mutually isolated cavities inside; At least one high-voltage converter module, at least one medium-voltage converter module, and at least one low-voltage DC power supply assembly are installed in different cavities to receive DC inputs of different voltage levels and output corresponding drive or power supply signals. The high-voltage contactor assembly and the medium-voltage contactor assembly are respectively housed in their respective cavities, and are used to distribute the externally input high-voltage DC power and medium-voltage DC power to the high-voltage converter module, the medium-voltage converter module and the low-voltage power supply module. The heat dissipation system includes heat dissipation components installed inside the cabinet and at least two independent cooling pipe compartments, wherein the cooling pipe compartments are connected to each heat-generating module through sealed interfaces to form multiple cooling loops; The high-voltage detection component is used to monitor the residual charge in the high-voltage DC circuit and output a discharge status indication signal. The multiple cavities are separated by metal partitions or metal components to achieve electrical isolation and electromagnetic shielding.

[0007] Optionally, the high-voltage contactor assembly is connected to a high-voltage line assembly, and the medium-voltage contactor assembly is connected to a medium-voltage line assembly, with the high-voltage line assembly and the medium-voltage line assembly arranged along the boundary of the corresponding cavity.

[0008] Optionally, the high-voltage converter module includes two traction converters. The traction converters take DC power of different voltage levels from the outside and send it through the high-voltage line assembly and the medium-voltage line assembly to the high-voltage contactor assembly and the medium-voltage contactor assembly, respectively. The two high-voltage DC power inverted by the two traction converters is then output to the outside of the converters to drive two traction motors.

[0009] Optionally, the medium-voltage converter module includes a hydraulic auxiliary drive converter. High-voltage DC power is connected to the hydraulic auxiliary drive converter via the high-voltage contactor assembly, and after inversion, it is output to the outside of the converter to drive the hydraulic pump motor.

[0010] Optionally, the medium-voltage converter module also includes a fan auxiliary drive converter. The medium-voltage DC power is divided into multiple medium-voltage DC power after passing through the medium-voltage contactor assembly. These are then connected to the fan auxiliary drive converter and the low-voltage DC power supply assembly via the medium-voltage line assembly. The medium-voltage DC power connected to the fan auxiliary drive converter is inverted and output to the outside of the converter to drive the fan motor. The medium-voltage DC power connected to the low-voltage DC power supply assembly is converted into low-voltage DC power, one of which provides power to the internal control and heat dissipation components, and the other is output to the outside of the converter to provide power to the control circuit.

[0011] Optionally, the high-voltage line assembly and the medium-voltage line assembly adopt a group of arranged copper busbars, cables or laminated busbars.

[0012] Optionally, the cabinet body is provided with multiple cabinet doors on the front and rear sides, and each cabinet door faces at least one of the cavities.

[0013] Optionally, the cooling pipe compartment is equipped with series and parallel pipes to distribute the low-temperature refrigerant provided by the heat dissipation component to the cooling interface of the corresponding heat-generating module, and to bring the high-temperature refrigerant back to the heat dissipation component.

[0014] Optionally, the cooling pipe compartment is equipped with a removable cover plate to form a sealed space during normal operation of the converter.

[0015] Optionally, the cabinet is equipped with an air inlet and outlet structure, which, together with the heat dissipation component, forms a forced air cooling channel for cooling the refrigerant in the heat dissipation component.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: Multi-voltage level integration: High voltage, medium voltage and low voltage bus voltages are introduced into a single cabinet and properly partitioned and isolated, thereby integrating functions such as high voltage traction, medium voltage auxiliary drive and low voltage control into a single converter, which greatly reduces the number of equipment on the whole vehicle and saves installation space. Strong electromagnetic compatibility: By arranging functional modules of different voltage levels in mutually isolated compartments, electromagnetic radiation and interference between functional modules are effectively reduced, and system stability is enhanced. Extremely low insulation risk: The voltage level is the same in a single area, so the insulation risk is small, which is conducive to compact spatial layout. Good maintenance convenience and safety: Each functional module is located in an isolated compartment, which facilitates maintenance. Only one voltage exists in each compartment, which greatly reduces the risk of electric shock between busbars. The high-voltage detection and status indication mechanism eliminates the risk of live operation. Attached Figure Description

[0017] Figure 1 The diagram shown is a schematic representation of the main structure of this invention. Figure 1 ; Figure 2 The diagram shown is a schematic of the heat dissipation component of the present invention; Figure 3 The diagram shown is a rear view of the present invention. Figure 1 ; Figure 4 The diagram shown is a schematic diagram of the main structure of the cabinet of this invention; Figure 5 The diagram shown is a rear view of the cabinet structure of the present invention; In the diagram: 1-Cabinet; 2-Heat dissipation assembly; 3-High voltage contactor assembly; 4-High voltage detection assembly; 5-Control assembly; 6-Fan auxiliary drive converter; 7-Hydraulic auxiliary drive converter; 8-Traction converter; 9-Medium voltage contactor assembly; 10-Low voltage DC power supply assembly; 101-First cooling pipe compartment; 102-Second cooling pipe compartment; 103-First cavity; 104-Second cavity; 105-Third cavity; 106-Fourth cavity; 107-Fifth cavity; 108-Sixth cavity; 109-Seventh cavity; 110-Eighth cavity; 111-Ninth cavity; 112-Tenth cavity; 113-Eleventh cavity; 21-First cabinet door; 31-Second cabinet door; 41-Third cabinet door; 51-Fourth cabinet door; 61-Fifth cabinet door Doors; 71-Sixth cabinet door; 81-Seventh cabinet door; 91-Eighth cabinet door; 114-Ninth cabinet door; 115-Tenth cabinet door; 116-Eleventh cabinet door; 117-Twelfth cabinet door; 118-Thirteenth cabinet door; 119-First cover plate of the pipe compartment; 120-Second cover plate of the pipe compartment; 121-Third cover plate of the pipe compartment; 122-Fourth cover plate of the pipe compartment; 123-Fifth cover plate of the pipe compartment; 124-Air outlet cover plate; 82-First high-voltage busbar; 72-Second high-voltage busbar; 62-First medium-voltage busbar; 32-High-voltage line assembly; 92-Medium-voltage line assembly; 83-First cooling water interface; 84-Second cooling water interface; 63-Third cooling water interface; 73-Fourth cooling water interface; 93-Fifth cooling water interface; 125-Inlet / outlet line assembly. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] like Figures 1-5 As shown, a multi-voltage level integrated converter is disclosed, comprising: Cabinet 1, wherein the cabinet contains multiple mutually isolated cavities; At least one high-voltage converter module, at least one medium-voltage converter module, and at least one low-voltage DC power supply assembly 10 are installed in different cavities to receive DC inputs of different voltage levels and output corresponding drive or power supply signals. The high-voltage contactor assembly 3 and the medium-voltage contactor assembly 9 are respectively housed in their respective cavities and are used to distribute the externally input high-voltage DC power and medium-voltage DC power to the high-voltage converter module, the medium-voltage converter module and the low-voltage power supply module. The heat dissipation system includes a heat dissipation component 2 installed inside the cabinet and at least two independent cooling pipe compartments, wherein the cooling pipe compartments are connected to each heat-generating module through sealed interfaces to form multiple cooling loops. High voltage detection component 4 is used to monitor the residual charge in the high voltage DC circuit and output a discharge status indication signal; like Figure 3 As shown, the lower rear side and left side of the cabinet 1 are provided with inlet / outlet cable assemblies 125.

[0022] The multiple cavities are separated by metal partitions or metal components to achieve electrical isolation and electromagnetic shielding.

[0023] like Figure 4 As shown, the integrated converter in this embodiment specifically includes a cabinet 1, and the front of the cabinet 1 is provided with a first cabinet door 21, a second cabinet door 31, a third cabinet door 41, a fourth cabinet door 51, a fifth cabinet door 61, a sixth cabinet door 71 and a seventh cabinet door 81.

[0024] like Figure 5 As shown, the rear of cabinet 1 is provided with an eighth cabinet door 91, a ninth cabinet door 114, a tenth cabinet door 115, an eleventh cabinet door 116, a twelfth cabinet door 117, and a thirteenth cabinet door 118.

[0025] In this embodiment, a first cavity 103 is provided inside the cabinet 1 facing the first cabinet door 21. The first cavity 103 is also directly opposite the eleventh cabinet door 116 on the rear side of the cabinet 1 and the air vent 124 on the left side of the cabinet 1. A second cavity 104 is provided inside the cabinet 1 facing the second cabinet door 31. The second cavity 104 is also directly opposite the tenth cabinet door 115 on the rear side of the cabinet 1. A third cavity 105 is provided inside the cabinet 1 facing the third cabinet door 41, and a fourth cavity 106 is provided inside the cabinet 1 facing the fourth cabinet door 51. The cabinet 1 facing the fifth cabinet door 61 has a fifth cavity 107 and a sixth cavity 108 inside; the cabinet 1 facing the sixth cabinet door 71 has a seventh cavity 109 inside; the cabinet 1 facing the seventh cabinet door 81 has an eighth cavity 110 inside; the cabinet 1 facing the eighth cabinet door 91 has a ninth cavity 111 inside; the cabinet 1 facing the ninth cabinet door 114 has an eleventh cavity 113 inside; and the cabinet 1 facing the twelfth cabinet door 117 and the thirteenth cabinet door 118 has a tenth cavity 112 inside.

[0026] In the above embodiments, clear boundaries are provided between each adjacent or opposite cavity to ensure that each cavity constitutes an independent space, thereby reducing interference between functional components and improving EMC performance. In this embodiment, the boundaries take the form of metal partitions and metal components.

[0027] In this embodiment, as Figure 1As shown, a heat dissipation assembly 2 is installed in the first cavity 103; a high-voltage contactor assembly 3 is installed in the second cavity 104; a high-voltage detection assembly 4 is installed in the third cavity 105; a control assembly 5 is installed in the fourth cavity 106; a fan auxiliary drive converter 6 is installed in the fifth cavity 107; a hydraulic auxiliary drive converter 7 is installed in the sixth cavity 108; two traction converters 8 are installed in the seventh cavity 109 and the eighth cavity 110 respectively; a medium-voltage contactor assembly 9 is installed in the ninth cavity 111; a first cooling pipe compartment 101 and a second cooling pipe compartment 102 are provided on the cabinet 1 in the tenth cavity 112; and a low-voltage DC power supply assembly 10 is installed in the eleventh cavity 113. In this embodiment, a high-voltage line assembly 32 and a medium-voltage line assembly 92 are provided along the boundary of the cabinet 1. The high-voltage line assembly 32 and the medium-voltage line assembly 92 are one or more combinations of cables, copper busbars, and laminated busbars. The cables and copper busbars in the high-voltage line assembly 32 and the medium-voltage line assembly 92 are arranged in groups to reduce external interference.

[0028] DC power of different voltage levels outside the converter enters the converter through the input / output line assembly 125, and then enters the high voltage contactor assembly 3 and the medium voltage contactor assembly 9 through the high voltage line assembly 32 and the medium voltage line assembly 92, respectively.

[0029] In this embodiment, both the high-voltage contactor assembly 3 and the medium-voltage contactor assembly 9 have the function of a PDU (Power Distribution Unit).

[0030] The high-voltage DC power is divided into three independently controllable high-voltage DC power lines after passing through the high-voltage contactor assembly 3. These lines are then connected to two traction converters 8 and a hydraulic auxiliary drive converter 7 via the high-voltage line assembly 32. Two high-voltage DC power supplies connected to the two traction converters 8 are inverted by the two traction converters 8 and output to the outside of the converters through the input / output assembly 125, respectively driving two traction motors, thereby achieving precise control of the movement of the new energy construction machinery; one high-voltage DC power supply connected to the hydraulic auxiliary drive converter 7 is inverted by the hydraulic auxiliary drive converter 7 and output to the outside of the converter through the input / output assembly 125, driving the hydraulic pump motor, thereby providing power for the operation of the new energy construction machinery.

[0031] In the specific implementation of this embodiment, the medium-voltage DC power is divided into multiple medium-voltage DC power after passing through the medium-voltage contactor assembly 9, and is connected to the fan auxiliary drive converter 6, the low-voltage DC power supply assembly 10 and the incoming and outgoing line assembly 125 respectively through the medium-voltage line assembly 92. The medium-voltage DC power connected to the fan auxiliary drive converter 6 is inverted by the fan auxiliary drive converter 6 and output to the outside of the converter through the input and output line assembly 125 to drive the fan motor, thereby providing a wind source for the cooling or other functions of the new energy engineering machinery vehicle. The medium-voltage DC power connected to the low-voltage DC power supply assembly 10 is converted into low-voltage DC power by the low-voltage DC power supply assembly 10. Part of it provides power to the control assembly 5 and heat dissipation assembly 2 inside the converter, and the other part is output to the outside of the converter through the input and output line assembly 125 to provide power to the control circuit of the new energy engineering machinery vehicle. The medium-voltage DC power connected to the input / output assembly 125 is output to the outside of the converter through the input / output assembly 125 to provide power to other auxiliary equipment on the new energy engineering machinery.

[0032] In this embodiment, the high-voltage detection component 4 can monitor the residual charge in the high-voltage DC circuit inside the converter and transmit the detection results to the outside of the converter in real time. This ensures that the capacitors have been fully discharged before maintenance, reducing the risk of electric shock between buses and increasing maintenance safety. In this embodiment, the detection results are transmitted via signal indicator lights.

[0033] In this embodiment, the first cooling pipe compartment 101 is provided with series and parallel pipes to reasonably distribute the low-temperature refrigerant provided by the heat dissipation component 2 to the second cooling water interface 84, the fourth cooling water interface 73 and the third cooling water interface 63, and to bring the high-temperature refrigerant back to the heat dissipation component 2. like Figure 4 As shown, the inlet and outlet of the traction converter 8 installed in the eighth cavity 110 are connected to the second cooling water interface 84 through a sealing assembly to achieve efficient heat dissipation of the traction converter 8.

[0034] The inlet and outlet of the hydraulic auxiliary drive converter 7 are connected to the fourth cooling water interface 73 at the rear end through a sealing assembly to achieve efficient heat dissipation of the hydraulic auxiliary drive converter 7.

[0035] The inlet and outlet of the fan auxiliary drive converter 6 are connected to the third cooling water interface 63 at the rear end through a sealing component to achieve efficient heat dissipation of the fan auxiliary drive converter 6.

[0036] like Figure 3 As shown, the second cooling pipe compartment 102 is equipped with series and parallel pipes, which reasonably distribute the low-temperature refrigerant provided by the heat dissipation component 2 to the first cooling water interface 83 and the fifth cooling water interface 93, and bring the high-temperature refrigerant back to the heat dissipation component 2.

[0037] The inlet and outlet of the traction converter 8 installed in the seventh cavity 109 are connected to the first cooling water interface 83 through a sealing assembly to achieve efficient heat dissipation of the traction converter 8.

[0038] The inlet and outlet of the low-voltage DC power supply assembly 10 are connected to the fifth cooling water interface 93 via hoses to achieve efficient heat dissipation of the low-voltage DC power supply assembly 10.

[0039] In this embodiment, the first cooling pipe compartment 101 and the second cooling pipe compartment 102 are respectively provided with a third pipe compartment cover 121, a fourth pipe compartment cover 122, a fifth pipe compartment cover 123, a first pipe compartment cover 119, and a second pipe compartment cover 120. When disassembling and maintaining the internal converters, these covers can be removed to provide maintenance space and facilitate disassembly and assembly. During normal operation of the converter, these covers can create a sealed space between the first cooling pipe compartment 101 and the second cooling pipe compartment 102, thereby providing secondary sealing protection for the fluid area, reducing the insulation risk caused by refrigerant leakage, and enhancing the safety of converter operation.

[0040] In this embodiment, ventilation holes are provided on the first cabinet door 21, the eleventh cabinet door 116 and the air outlet shroud 124. The heat dissipation assembly 2 is equipped with a forced ventilation device, such as a fan, which can draw cold air from outside the converter into the heat dissipation assembly 2 through the first cabinet door 21 and the eleventh cabinet door 116, exchange heat in the heat dissipation assembly 2 and then blow it out of the converter through the air outlet shroud 124, thereby achieving cooling of the refrigerant and ensuring heat dissipation efficiency.

[0041] In this embodiment, the multi-voltage level all-in-one converter includes various functional units, which can control and drive various basic and extended functions of new energy engineering machinery.

[0042] In this embodiment, the multi-voltage level all-in-one converter includes three voltage levels of DC power: high voltage, medium voltage, and low voltage, which provide power to different functional units respectively.

[0043] In this embodiment, each functional unit in the multi-voltage level all-in-one converter is installed in its own independent space composed of the cabinet 1 and the cavities and components on the cabinet 1, thereby separating the functional units of the multi-voltage level all-in-one converter from each other and separating components of different voltage levels in different areas to ensure the safety and electromagnetic compatibility performance of the multi-voltage level all-in-one converter during operation and maintenance.

[0044] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-voltage level integrated converter, characterized in that, include: Cabinet (1), wherein the cabinet is provided with multiple mutually isolated cavities; At least one high-voltage converter module, at least one medium-voltage converter module and at least one low-voltage DC power supply assembly (10) are installed in different cavities to receive DC input of different voltage levels and output corresponding drive or power supply signals. The high-voltage contactor assembly (3) and the medium-voltage contactor assembly (9) are respectively located in the corresponding cavities and are used to distribute the externally input high-voltage DC power and medium-voltage DC power to the high-voltage converter module, the medium-voltage converter module and the low-voltage power supply module. The heat dissipation system includes a heat dissipation component (2) installed inside the cabinet and at least two independent cooling pipe compartments, wherein the cooling pipe compartments are connected to each heat-generating module through sealed interfaces to form multiple cooling loops; The high voltage detection component (4) is used to monitor the residual charge in the high voltage DC circuit and output a discharge status indication signal; The multiple cavities are separated by metal partitions or metal components to achieve electrical isolation and electromagnetic shielding.

2. The multi-voltage level integrated converter according to claim 1, characterized in that, The high-voltage contactor assembly (3) is connected to a high-voltage line assembly (32), and the medium-voltage contactor assembly (9) is connected to a medium-voltage line assembly (92). The high-voltage line assembly (32) and the medium-voltage line assembly (92) are arranged along the boundaries of the corresponding cavities.

3. The multi-voltage level integrated converter according to claim 2, characterized in that, The high-voltage converter module includes two traction converters (8). The traction converters (8) take DC power of different voltage levels from the outside and pass it through the high-voltage line assembly (32) and the medium-voltage line assembly (92) to the high-voltage contactor assembly (3) and the medium-voltage contactor assembly (9), respectively. The two high-voltage DC power connected to the two traction converters (8) are inverted and output to the outside of the converter to drive two traction motors.

4. The multi-voltage level integrated converter according to claim 3, characterized in that, The medium-voltage converter module includes a hydraulic auxiliary drive converter (7). High-voltage DC power is connected to the hydraulic auxiliary drive converter (7) through the high-voltage contactor assembly (3) and then output to the outside of the converter to drive the hydraulic pump motor.

5. The multi-voltage level integrated converter according to claim 3, characterized in that, The medium-voltage converter module also includes a fan auxiliary drive converter (6). The medium-voltage DC power is divided into multiple medium-voltage DC power after passing through the medium-voltage contactor assembly (9). These are connected to the fan auxiliary drive converter 6 and the low-voltage DC power supply assembly (10) respectively via the medium-voltage line assembly (92). The medium-voltage DC power connected to the fan auxiliary drive converter (6) is inverted and output to the outside of the converter to drive the fan motor. The medium-voltage DC power connected to the low-voltage DC power supply assembly (10) is converted into low-voltage DC power, one of which provides power to the internal control assembly (5) and heat dissipation assembly (2), and the other is output to the outside of the converter to provide power to the control circuit.

6. The multi-voltage level integrated converter according to claim 2, characterized in that, The high-voltage line assembly (32) and the medium-voltage line assembly (92) adopt grouped copper busbars, cables or laminated busbars.

7. The multi-voltage level integrated converter according to claim 1, characterized in that, The cabinet has multiple cabinet doors on its front and rear sides, and each cabinet door faces at least one of the cavities.

8. The multi-voltage level integrated converter according to claim 1, characterized in that, The cooling pipe compartment is equipped with series and parallel pipes to distribute the low-temperature refrigerant provided by the heat dissipation component (2) to the cooling interface of the corresponding heat-generating module, and to bring the high-temperature refrigerant back to the heat dissipation component (2).

9. The multi-voltage level integrated converter according to claim 8, characterized in that, The cooling pipe compartment is equipped with a removable cover plate, which forms a sealed space when the converter is operating normally.

10. The multi-voltage level integrated converter according to claim 1, characterized in that, The cabinet is equipped with an air inlet and outlet structure, which, together with the heat dissipation components, forms a forced air cooling channel for cooling the refrigerant in the heat dissipation components.

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