Dual three-phase water-cooling integrated high-density power converter and use method thereof

Abstract

The invention provides a dual three-phase water-cooling integrated high-density power converter and a use method thereof. Comprising an inversion module, one side of the inversion module is connected with a filtering module, and the inversion module and the filtering module are connected with conductive busbars for realizing electric connection; the inversion module comprises a heat dissipation shell, an output busbar is arranged in the heat dissipation shell, and one end of the output busbar penetrates out of the end face of the rear end of the heat dissipation shell and is connected with a conductive busbar; a plurality of supporting frames are installed in the heat dissipation shell, each supporting frame is provided with an interlayer type water cooling radiator, a power unit is installed in an interlayer of each water cooling radiator, positive and negative terminals of each power unit are connected with an output busbar, an AC terminal of each power unit is connected with a midpoint copper end, and the midpoint copper ends are connected with an external AC load end. A control unit and a supporting capacitor are installed in the heat dissipation shell in a suspended mode. According to the device, the power unit is mounted in the interlayer of the water-cooling radiator, so that the power density and the heat dissipation efficiency are remarkably improved, and the cooling stability under high load is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of power electronics, and in particular relates to a dual three-phase water-cooled integrated high-density power converter device and a use method thereof. Background Art

[0002] An inverter is a power conversion device used to convert current. During use, it often generates a large amount of heat internally. In order to prevent the increase in internal heat during use of the inverter device, which may cause the internal temperature of the inverter device to rise and affect its internal components, traditional inverter devices often adopt a single-sided heat dissipation method, that is, a cooling fan is installed inside the inverter device. The cooling fan forms an airflow in the inverter device, blowing out part of the heat generated by the operation of the inverter device to achieve the effect of cooling. However, as the power conversion power of the inverter device increases, the number of components inside the inverter device gradually increases. Each component is installed independently in a decentralized layout, resulting in a small internal space of the inverter device. The flow direction of the airflow generated by the cooling fan is severely blocked, resulting in low heat dissipation efficiency. At the same time, due to the small internal space, when repairing the inverter device, components located at the bottom or center of the inverter device need to be removed from other components to make enough space, making the repair time-consuming and labor-intensive. Summary of the Invention

[0003] In order to solve the problems that the air cooling effect of the inverter device is poor and the components in the inverter device are installed independently, resulting in a small internal space of the inverter device and time-consuming and labor-intensive maintenance, the present invention provides a dual three-phase water-cooled integrated high-density power converter device and a method of use.

[0004] To achieve the above object, the present invention provides the following technical solutions: The present invention proposes a dual three-phase water-cooled integrated high-density power converter device, comprising an inverter module, one side of which is connected to a filter module, and the rear end faces of the inverter module and the filter module are connected to conductive busbars for achieving electrical connection; The inverter module includes a heat dissipation housing, an output busbar is transversely arranged in the heat dissipation housing, and one end of the output busbar extends out of the rear end surface of the heat dissipation housing and is connected to the conductive busbar; a plurality of support frames are respectively installed on both sides of the output busbar in the heat dissipation housing, each of the support frames is installed with a sandwich-type water-cooled radiator, and a power unit is installed in the sandwich of the water-cooled radiator, the positive and negative terminals of the power unit are connected to the output busbar, and the AC terminal of the power unit is connected to a midpoint copper terminal, and the midpoint copper terminal is connected to an external AC load terminal; A control unit is suspended near the top and bottom of the heat dissipation housing, and a signal input connector extending to the outside of the heat dissipation housing is provided on the control unit located at the top of the heat dissipation housing; A support capacitor is installed in the heat dissipation housing at a position close to the rear end thereof, and the top of the support capacitor is connected to the output busbar.

[0005] Preferably, the heat dissipation housing includes two side plates parallel to each other, a first guard plate is provided on the front end surfaces of the two side plates, a second guard plate is provided on the rear end surfaces of the two side plates, and a connection groove for passing the output busbar is provided on the second guard plate; The tops of the two side panels are connected to the top panel via screws, and the bottoms of the two side panels are connected to the bottom panel via screws; the supporting capacitor is installed above the bottom panel; A filter module is connected to one of the side panels via screws, and a rear end of the filter module is flush with an outer end surface of the second guard plate.

[0006] Preferably, both the first guard plate and the second guard plate are provided with honeycomb-shaped heat dissipation holes.

[0007] Preferably, the bottom of the base plate is provided with an anti-slip base and a slide groove, and a connecting belt is installed in the slide groove.

[0008] Preferably, an input busbar is provided on the rear end face of the filter module, and the conductive busbar is connected to the input busbar. The conductive busbar is led out from the input busbar of the filter module and then bent vertically to form a horizontal section, which extends horizontally to the position where the output busbar extends out of the rear end face of the heat dissipation shell and is connected to the output busbar.

[0009] Preferably, the left and right sides of the control unit are respectively connected with buckles, and the buckles are fixed to the side walls of the heat dissipation housing so that the control unit is suspended in the heat dissipation housing; Second heat dissipation holes are provided on the front and rear side surfaces of the control unit.

[0010] Preferably, water pipes for circulating water-cooling liquid are connected between the water-cooling radiators, and a water-cooling liquid inlet is externally connected to the water-cooling radiator near the end of the heat dissipation shell.

[0011] Preferably, a decoupling capacitor is installed on the output busbar on one side of the water-cooled radiator.

[0012] Preferably, the surface of the power unit is coated with thermal grease; and a silicone cushion is provided between the support frame and the water-cooled radiator.

[0013] The present invention proposes a method for using a dual three-phase water-cooled integrated high-density power converter device, which uses the aforementioned dual three-phase water-cooled integrated high-density power converter device, including the following steps: Connect the water-cooling liquid input device of the water-cooling radiator to ensure that the cooling liquid flow path in the water-cooling radiator is unobstructed; Connect the power input terminal to the filter module, connect the AC load terminal to the midpoint copper terminal, and connect the external control signal line to the signal input connector on the control unit; During startup, the water-cooled radiator is first turned on to stabilize the temperature of the interlayer in the water-cooled radiator and then the power is turned on. The control unit drives the power unit to perform current conversion operation according to the input signal of the signal input connector. The heat generated by the power unit is quickly discharged through the interlayer water-cooled radiator, and the support capacitor and the decoupling capacitor work together to maintain voltage stability.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention proposes a dual-three-phase water-cooled integrated high-density power converter. By installing the power unit in the interlayer of the water-cooled radiator, this device significantly improves the power density and heat dissipation efficiency. The water-cooling structure is controlled to reduce the temperature difference of the power module, and the heat dissipation housing is used to ensure the stability of cooling under high load.

[0015] Furthermore, the device uses a sandwich water-cooled radiator directly embedded in the power unit, which significantly improves the heat dissipation efficiency and reduces the thermal resistance, ensuring stable operation of components under high power density.

[0016] Furthermore, in this device, the inverter module, filter module, support capacitor and control unit are highly integrated through the integrated layout in the heat dissipation shell, thereby optimizing space utilization. Compared with the traditional discrete installation, the integrated installation of this device saves installation space, so that sufficient space can be reserved in the heat dissipation shell to form a heat dissipation channel and an inspection channel, so that during the inspection process, there is no need to disassemble other components, and the damaged components can be directly inspected, which improves the inspection speed.

[0017] Furthermore, the electrical busbar in this device replaces traditional cable connections, eliminating the stray inductance caused by independent wiring, reducing contact resistance, improving current transmission efficiency and simplifying the assembly process.

[0018] Furthermore, the suspended control unit in this device is installed with the signal input connector externally, achieving physical isolation between strong and weak electricity, which not only ensures the anti-interference performance of the control circuit, but also facilitates rapid inspection and maintenance; Furthermore, the integrated connection structure between the output busbar and the midpoint copper terminal in this device optimizes the current loop path, reduces power loss, and cooperates with the water cooling system to reduce the temperature rise of the entire machine by 25%-30% when running at full load; Furthermore, the standardized interface between the modular support frame and the water-cooled radiator in this device supports hot-swap maintenance of the power unit, which saves maintenance time. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 A schematic structural diagram of a dual three-phase water-cooled integrated high-density power converter device provided by the present invention; Figure 2 A schematic diagram of the structure of a dual three-phase water-cooled integrated high-density power converter provided by the present invention from a bottom view; Figure 3 A schematic diagram of the internal structure of a dual three-phase water-cooled integrated high-density power converter provided by the present invention; Figure 4 A schematic diagram showing the connection between a water-cooled radiator, a midpoint copper terminal, and a power module in a dual three-phase water-cooled integrated high-density power converter device provided by the present invention; Figure 5 A schematic structural diagram of a power unit in a dual three-phase water-cooled integrated high-density power converter provided by the present invention; Figure 6 This is a schematic diagram of the installation of a filter module in a dual three-phase water-cooled integrated high-density power converter provided by the present invention; In the attached figure: 1. Inverter module; 2. Filter module; 3. Conductive busbar; 4. Top plate; 5. Signal input connector; 6. Water pipe connector; 7. Bottom plate; 8. Anti-slip base; 9. Connecting belt; 10. Output busbar; 11. Inverter positive busbar; 12. Inverter negative busbar; 13. Support capacitor; 14. Control unit; 15. Water-cooled radiator; 16. Water pipe; 17. First guard plate; 18. Second guard plate; 19. Power unit; 20. Midpoint copper terminal; 21. Decoupling capacitor; 22. Filter capacitor; 23. Input busbar; 24. Filter module housing; 25. Heat dissipation housing; 26. Lifting ring; 27. Connector; 28. I-bracket; 29. Fixing seat. DETAILED DESCRIPTION

[0019] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0020] In the description of the present invention, 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", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to 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 invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0022] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0023] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0024] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] The present invention proposes a dual three-phase water-cooled integrated high-density power converter device, such as Figures 1 to 5As shown, it includes an inverter module 1, a filter module 2 is connected to the left side of the inverter module 1, the inverter module 1 and the filter module 2 are arranged side by side, and a conductive busbar 3 is connected to the rear end faces of the inverter module 1 and the filter module 2, and the electrical connection between the inverter module 1 and the filter module 2 is achieved through the conductive busbar 3; like Figures 1 to 5 As shown, the inverter module 1 includes a heat dissipation shell 25, in which an output busbar 10 is horizontally arranged, and one end of the output busbar 10 passes through the rear end face of the heat dissipation shell 25, and the end of the output busbar 10 located outside the rear end face of the heat dissipation shell 25 is connected to one end of the conductive busbar 3. The output busbar 10 divides the heat dissipation shell 25 into two upper and lower chambers, namely the upper chamber and the lower chamber. A plurality of support frames are respectively installed at the positions above and below the output busbar 10 in the heat dissipation shell 25, namely A plurality of support frames are horizontally installed at the bottom of the upper chamber and the top of the lower chamber, and the plurality of support frames are arranged at equal intervals along the length direction of the output busbar 10, and one end of the support frame is fixed to the side surface on the left side of the inside of the heat dissipation shell 25, and one end of the support frame is fixed to the side surface on the right side of the inside of the heat dissipation shell 25. A water-cooled radiator 15 is installed in each support frame, and a silicone cushion is provided between the support frame and the water-cooled radiator 15. A water pipe for circulating water-cooled liquid is connected between the plurality of water-cooled radiators 15. 16. A water-cooled liquid inlet is externally connected to the water-cooled radiator 15 near its end in the heat dissipation housing; the water-cooled radiator 15 is a sandwich structure, and multiple power units 19 are vertically installed in the interlayer of the water-cooled radiator 15. The surface of the power unit 19 is coated with thermal grease; the positive and negative terminals of the multiple power units 19 are located on the same side, that is, relative to the output busbar 10, and the upper and lower ends of the water-cooled radiator 15 are provided with connecting rings, and a connector 27 is passed through the connecting ring to limit the power unit 19 The horizontal displacement in the water-cooled radiator 15, the connector 27 is a connecting bolt that limits the power unit 19. The positive and negative terminals of the power unit 19 are connected to the output busbar 10. The end of the power unit 19 away from the output busbar 10 is provided with an AC terminal, and the AC terminal is connected to the midpoint copper terminal 20. The midpoint copper terminal 20 includes a horizontal section with a triangular hollow structure. One end of the horizontal section is connected to the AC terminal, and the other end is provided with a vertical section. The upper end of the vertical section is connected to the external AC load terminal; like Figure 3 and Figure 4As shown, a control unit 14 is suspended in the heat dissipation shell 25 near its top and bottom, that is, a control unit 14 is suspended in the upper chamber above the water-cooled radiator 15 and in the lower chamber below the water-cooled radiator 15, and a signal input connector 5 is provided on the control unit 14, that is, the signal input connector 5 includes a signal line, and the outer part of the signal line is provided with a shielding sleeve, which is connected to the external control system of the signal input connector 5, and one end of the signal input connector 5 extends from the side of the heat dissipation shell 25 to the outside of the heat dissipation shell 25; a support capacitor 13 is installed in the heat dissipation shell 25 near its rear end face, and four support capacitors 13 are provided, and the four support capacitors 13 are arranged in a field topology, and stacking terminals are provided on the top of the four support capacitors 13, and the stacking terminals are connected to the output busbar 10.

[0026] like Figures 1 to 3 As shown, the heat dissipation housing 25 includes two side plates parallel to each other, a first guard plate 7 is provided on the front end surfaces of the two side plates, a second guard plate 8 is provided on the rear end surfaces of the two side plates, a connection groove for passing the output busbar 10 is provided on the inner end surface of the second guard plate 8, an inverter negative busbar 12 and an inverter positive busbar 11 are provided on the output busbar 10 at one end opposite to the connection groove, the inverter negative busbar 12 and the inverter positive busbar 11 extend out of the connection groove and are connected to the wire busbar 3, wherein the filter module 2 is connected to the side plate on the left by screws, and the rear of the filter module 2 is connected to the filter module 2. The end is flush with the outer end face of the second guard plate 8; honeycomb heat dissipation holes are provided on the first guard plate 7 and the second guard plate 8, and the honeycomb heat dissipation holes on the first guard plate 7 are symmetrically arranged with the honeycomb heat dissipation holes on the second guard plate 8. The tops of the two side plates are detachably connected to the top plate 4 by screws, and the bottoms of the two side plates are detachably connected to the bottom plate 7 by screws. A supporting capacitor 13 is installed on the upper end face of the bottom plate 7. The detachably connected top plate 4 and bottom plate 7 can facilitate the opening of the heat dissipation shell 25, thereby facilitating the maintenance of components installed in the heat dissipation shell 25, thereby improving maintenance efficiency.

[0027] Preferably, a non-slip base 8 is provided on the bottom end surface of the base plate 7, and the non-slip base 8 can enable the device to be stably placed on the platform to be placed. A slide groove is also provided on the bottom end surface of the base plate 7, and a connecting belt 9 is installed in the slide groove. The connecting belt 9 realizes modular splicing of the inverter module 1 and the filter module 2, while increasing the stability of the splicing between the inverter module 1 and the filter module 2 and improving the connection strength between the inverter module 1 and the filter module 2.

[0028] like Figures 1 to 6As shown, the filter module 2 includes a filter module housing 24, which is provided with a third heat dissipation hole on the rear end surface of the filter module housing 24, and a removable top plate 4 is also provided on the top of the filter module housing 24. A fixing seat 29 is provided on the bottom end surface of the filter module housing 24, and a limiting groove arranged in a field shape is provided on the fixing seat 29. A filter capacitor 22 is installed in the limiting groove, and an I-shaped bracket 28 is provided on the outer wall of two adjacent filter capacitors 22 near the top thereof. The fixing seat 29 and the filter capacitor 22, the I-shaped bracket 28 and the filter Shock-absorbing rubber pads are provided between the wave capacitors 22. An input busbar 23 is provided on the top of the filter capacitor 22. The input busbar 23 extends to the outside from the rear end face of the filter module shell 24. The conductive busbar 3 is connected to the input busbar 23. The conductive busbar 3 is led out from the input busbar 23 of the filter module 2 and then bent vertically to form a horizontal section. It extends horizontally to the position where the rear end face of the heat dissipation shell 25 is extended from the output busbar 10, and is respectively connected to the inverter negative busbar 12 and the inverter positive busbar 11 set on the output busbar 10. A hanging ring 26 is provided on the rear end face of the filter module shell 24.

[0029] like Figure 3 and Figure 4 As shown, the left and right sides of the control unit 14 are respectively connected with clips, which are fixed on the left and right side walls of the heat dissipation shell 25 so that the control unit 14 is suspended in the heat dissipation shell 25; second heat dissipation holes are provided on the front and rear side surfaces of the control unit 14.

[0030] like Figure 3 and Figure 4 As shown, a decoupling capacitor 21 is installed on one side of the water-cooled radiator 15 on the output busbar 10 , and the pins of the decoupling capacitor 21 are connected to the output busbar 10 through screws, forming a low-inductance loop through the decoupling capacitor 21 .

[0031] The present invention also proposes a method for using a dual three-phase water-cooled integrated high-density power converter device, which uses the aforementioned dual three-phase water-cooled integrated high-density power converter device, including the following steps: Connect the water coolant inlet of the water-cooled radiator 15 to ensure that the coolant flow path in the water pipe 16 is unobstructed; Connect the power input end to the input busbar 23 of the filter module 2, connect the AC load end to the output port of the midpoint copper terminal 20, that is, the vertical section of the midpoint copper terminal 2, and connect the external control signal line to the signal input connector 5 of the control unit 14.

[0032] During startup, the water-cooled radiator 15 is first turned on to circulate the coolant in the water-cooled radiator 15. After the temperature stabilizes, the power supply is turned on. The control unit 14 drives the power unit 19 to perform a current conversion operation according to the input signal transmitted by the external control signal line. The heat generated by the power unit 19 during operation is quickly dissipated through the sandwich water-cooling radiator 15, and the support capacitor 13 and the decoupling capacitor 21 cooperate to maintain voltage stability.

[0033] When maintenance is required, the support frame of the water-cooled radiator 15 can be directly disassembled after disconnecting the power supply, and the power module 19 can be pulled out and replaced without disassembling adjacent components.

[0034] During the entire process, the conductive busbar 3 maintains a fixed connection between the inverter unit 1 and the filter module 2 , and the control unit 14 is separated from the location of the power unit 19 by being installed in the air.

[0035] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0036] In addition, it should be understood that although this specification describes the embodiments, not every embodiment contains only one independent technical solution. This description is for clarity only. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for the purpose of illustrating the technical concept of the present invention and cannot be used to limit the scope of protection of the present invention. Any changes made based on the technical solution in accordance with the technical concept proposed by the present invention fall within the scope of protection of the claims of the present invention.

Claims

1. A dual three-phase water-cooled integrated high-density power converter, characterized in that: It comprises an inverter module (1), one side of the inverter module (1) is connected to a filter module (2), and rear end surfaces of the inverter module (1) and the filter module (2) are connected to a conductive busbar (3) for achieving electrical connection; The inverter module (1) includes a heat dissipation shell (25), an output busbar (10) is transversely arranged in the heat dissipation shell (25), and one end of the output busbar (10) passes through the rear end face of the heat dissipation shell (25) and is connected to the conductive busbar (3); a plurality of support frames are respectively installed on both sides of the output busbar (10) in the heat dissipation shell (25), each of the support frames is installed with a sandwich-type water-cooling radiator (15), a power unit (19) is installed in the sandwich of the water-cooling radiator (15), the positive and negative terminals of the power unit (19) are connected to the output busbar (10), the AC terminal of the power unit (19) is connected to a midpoint copper terminal (20), and the midpoint copper terminal (20) is connected to an external AC load terminal; A control unit (14) is suspended and installed near the top and bottom of the heat dissipation housing (25), and a signal input connector (5) extending to the outside of the heat dissipation housing (25) is provided on the control unit (14) located at the top of the heat dissipation housing (25); A support capacitor (13) is installed in the heat dissipation housing (25) at a position close to the rear end thereof, and the top of the support capacitor (13) is connected to the output busbar (10).

2. A dual three-phase water-cooled integrated high-density power converter according to claim 1, characterized in that: The heat dissipation housing (25) comprises two side plates parallel to each other, a first guard plate (7) is provided on the front end surfaces of the two side plates, a second guard plate (8) is provided on the rear end surfaces of the two side plates, and a connection groove for passing the output busbar (10) is provided on the second guard plate (8); The tops of the two side panels are connected to a top panel (4) via screws, and the bottoms of the two side panels are connected to a bottom panel (7) via screws; the supporting capacitor (13) is installed above the bottom panel (7); A filter module (2) is connected to one of the side panels via screws, and the rear end of the filter module (2) is flush with the outer end surface of the second guard plate (8).

3. The dual three-phase water-cooled integrated high-density power converter according to claim 2, characterized in that: Both the first guard plate (7) and the second guard plate (8) are provided with honeycomb-shaped heat dissipation holes.

4. The dual three-phase water-cooled integrated high-density power converter according to claim 2, characterized in that: The bottom of the base plate (7) is provided with an anti-skid base (8) and a slide groove, and a connecting belt (9) is installed in the slide groove.

5. The dual three-phase water-cooled integrated high-density power converter according to claim 1, characterized in that: An input busbar (23) is provided on the rear end face of the filter module (2), and the conductive busbar (3) is connected to the input busbar (23). The conductive busbar (3) is led out from the input busbar (23) of the filter module (2), is vertically bent to form a horizontal section, and extends horizontally to the position of the output busbar (10) extending out of the rear end face of the heat dissipation housing (25), and is connected to the output busbar (10).

6. The dual three-phase water-cooled integrated high-density power converter according to claim 1, characterized in that: Buckles are connected to the left and right sides of the control unit (14), respectively, and the buckles are fixed to the side walls of the heat dissipation housing (25), so that the control unit (14) is suspended in the heat dissipation housing (25); Second heat dissipation holes are provided on the front and rear side surfaces of the control unit (14).

7. The dual three-phase water-cooled integrated high-density power converter according to claim 1, characterized in that: A water pipe (16) for circulating water-cooling liquid is connected between the water-cooling radiators (15), and a water-cooling liquid inlet is externally connected to the water-cooling radiator (15) near its end in the heat dissipation housing.

8. The dual three-phase water-cooled integrated high-density power converter according to claim 1, characterized in that: A decoupling capacitor (21) is installed on the output busbar (10) at one side of the water-cooled radiator (15).

9. The dual three-phase water-cooled integrated high-density power converter according to claim 1, characterized in that: The surface of the power unit (19) is coated with thermal conductive silicone grease; and a silicone cushion is provided between the support frame and the water-cooled radiator (15).

10. A method for using a dual three-phase water-cooled integrated high-density power converter device, using the dual three-phase water-cooled integrated high-density power converter device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Connecting the water-cooling liquid to the water-cooling radiator (15) to ensure that the cooling liquid flow path in the water-cooling radiator (15) is unobstructed; Connect the power input terminal to the filter module (2), connect the AC load terminal to the midpoint copper terminal (20), and connect the external control signal line to the signal input connector (5) on the control unit (14); During startup, the water-cooled radiator (15) is first turned on to stabilize the temperature of the interlayer in the water-cooled radiator (15) and then the power is turned on. The control unit (14) drives the power unit (19) to perform a current conversion operation according to the input signal of the signal input connector (5). The heat generated by the power unit (19) is quickly discharged through the interlayer water-cooled radiator (15). The support capacitor (13) and the decoupling capacitor (21) cooperate to maintain voltage stability.

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