Power conversion device

Abstract

The utility model relates to a power conversion device which at least comprises a capacitor module; a power circuit board module, the power circuit board module and the capacitor module being arranged on top of each other and spaced apart from each other in a height direction perpendicular to the main extension plane; a housing configured to at least partially enclose the capacitor module, the housing forming a cooling chamber arranged between the capacitor module and the power circuit board module, the cooling chamber having a first side wall facing the capacitor module and a second side wall facing the power circuit board module and being configured to be adapted to be flowed through by a cooling medium, a plurality of cooling fins are arranged in the cooling chamber, and the cooling fins extend into the cooling chamber in the height direction from at least one of the first side wall and the second side wall. According to the present invention, the cooling efficiency can be improved in a compact configuration, so that the operating temperature of the power conversion device is maintained in a relatively low range, thereby improving the operating efficiency of the power conversion device and prolonging the service life.

Description

Technical Field

[0001] The utility model relates to the technical field of power conversion devices, in particular to a power conversion device. Background Art

[0002] Power conversion devices are devices that convert one form of electrical energy into another and are widely used in various electrical systems. These devices can be constructed in various types, such as DC-DC converters, rectifiers, and inverters. Typically, a power conversion device includes a capacitor module for energy storage, filtering, and decoupling, as well as a power circuit board module for power processing and control. The power circuit board module includes power semiconductor devices arranged on a power circuit board. During operation, the capacitor module and the power circuit board module generate a significant amount of heat, which increases the temperature of the power conversion device, adversely affecting its operating efficiency and service life. Utility Model Content

[0003] Therefore, the purpose of the present invention is to propose an improved power conversion device, which can improve the cooling efficiency in a compact configuration so as to keep the operating temperature of the power conversion device within a relatively low range, thereby improving the working efficiency of the power conversion device and extending its service life.

[0004] According to the present invention, a power conversion device is provided, wherein the power conversion device at least includes:

[0005] -Capacitor modules;

[0006] a power circuit board module, the power circuit board module and the capacitor module being arranged one above the other and spaced apart in a height direction perpendicular to the main extension plane; and

[0007] - a shell, which is configured to at least partially encapsulate the capacitor module, wherein the shell forms a cooling chamber arranged between the capacitor module and the power circuit board module, the cooling chamber having a first side wall facing the capacitor module and a second side wall facing the power circuit board module and being configured to be suitable for a cooling medium to flow through, wherein a plurality of cooling fins are arranged in the cooling chamber, and the cooling fins extend from at least one of the first side wall and the second side wall into the cooling chamber in the height direction.

[0008] Compared with the prior art, in the power conversion device according to the present invention, the capacitor module and the power circuit board module are stacked on each other and arranged spaced apart in the height direction, wherein a cooling chamber between the capacitor module and the power circuit board module is formed by the shell that encapsulates the capacitor module, so that a cooling medium can flow between the capacitor module and the power circuit board module, and the cooling medium can cool the capacitor module through the first side wall of the cooling chamber and cool the power circuit board module through the second side wall, which can realize a space-saving compact configuration of the power conversion device, wherein a plurality of cooling fins are arranged in the cooling chamber, and the cooling fins extend from at least one of the first side wall and the second side wall into the cooling chamber, which significantly increases the heat exchange area with the cooling medium, thereby improving the cooling efficiency of the cooling chamber, which can ensure a relatively low operating temperature of the power conversion device, thereby improving the operating efficiency of the power conversion device and extending its service life.

[0009] According to an exemplary embodiment of the present invention, the cooling fins continuously extend from the first side wall to the second side wall in the height direction.

[0010] According to an exemplary embodiment of the present invention, the cross-sectional shape of the cooling fins is selected from the following group: circular, elliptical, teardrop-shaped, polygonal, corrugated, and needle-shaped; and / or the cooling fins are evenly distributed on the main extension plane.

[0011] According to an exemplary embodiment of the present invention, the cooling chamber has a fluid inlet and a fluid outlet, and the fluid inlet and the fluid outlet are arranged at diagonally opposite corners of the cooling chamber relative to each other.

[0012] According to an exemplary embodiment of the present invention, the cooling fins and the cooling chamber are constructed as an integrally formed part; and / or the housing is made of a metal material; and / or the housing is further configured to encapsulate the power circuit board module.

[0013] According to an exemplary embodiment of the present invention, thermal conductive gel is applied between the capacitor module and the first side wall and between the power circuit board module and the second side wall.

[0014] According to an exemplary embodiment of the present invention, the housing is provided with an additional cooling chamber on a side of the capacitor module and / or the power circuit board module facing away from the cooling chamber.

[0015] According to an exemplary embodiment of the present invention, the power conversion device further includes an inductor module, which is arranged side by side with the capacitor module and the power circuit board module, wherein the cooling medium also flows through the inductor module.

[0016] According to an exemplary embodiment of the present invention, the power conversion device includes a cooling medium supply line and a cooling medium exhaust line, wherein the cooling medium supply line and the cooling medium exhaust line are respectively in fluid communication with the cooling chamber.

[0017] According to an exemplary embodiment of the present invention, the power conversion device is configured as a DCDC converter for a fuel cell system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following describes the present invention in more detail with reference to the accompanying drawings, so that the principles, features and advantages of the present invention can be better understood. The accompanying drawings include:

[0019] Figure 1 A perspective view of a power conversion device according to an exemplary embodiment of the present invention is shown;

[0020] Figure 2a and Figure 2b 1. A front view and a top view of a power conversion device according to an exemplary embodiment of the present invention are respectively shown, wherein the flow direction of the cooling medium is drawn by arrows;

[0021] Figure 3 A schematic view of a cooling chamber of a power conversion device according to an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and multiple exemplary embodiments.

[0023] It should be understood that, in this document, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance, nor as implicitly specifying the quantity of the technical features being referenced. A feature specified as "first" or "second" may explicitly or implicitly indicate that at least one of the features is included.

[0024] In this specification, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct connections, indirect connections through intermediaries, or internal communication between two components. Those skilled in the art will understand the meaning of these terms in this disclosure based on the specific circumstances.

[0025] Figure 1FIG. 1 shows a perspective view of a power conversion device 100 according to an exemplary embodiment of the present invention. Figure 2a and Figure 2b 1 and 2 show a front view and a top view of a power conversion device 100 according to an exemplary embodiment of the present invention, respectively, wherein the flow direction of the cooling medium is indicated by an arrow P. Figure 3 A schematic diagram of a cooling chamber 31 of a power conversion device 100 according to an exemplary embodiment of the present invention is shown. Here, the power conversion device 100 is particularly configured as a DC-DC converter for a fuel cell system. However, it is also conceivable that the power conversion device 100 is configured as a rectifier, inverter, or transformer and used in systems such as renewable energy systems or electric vehicles.

[0026] like Figure 1 As shown, power conversion device 100 includes a capacitor module 10 and a power circuit board module 20. Capacitor module 10 is configured to perform filtering, energy storage, decoupling and noise reduction, and power factor correction functions to ensure output voltage stability, while power circuit board module 20 is configured to control and convert electrical energy and includes a power circuit board and power semiconductor devices arranged thereon, such as MOSFETs and IGBTs. Capacitor module 10 and power circuit board module 20 are arranged spaced apart from each other in a height direction perpendicular to a main extension plane, with power circuit board module 20 being arranged above capacitor module 10 in particular. This saves structural space in the direction of the main extension plane, enabling a compact design of power conversion device 100.

[0027] like Figure 1 and Figure 2aAs shown, power conversion device 100 includes a housing 30 configured to at least partially, and in particular, completely, encapsulate capacitor module 10. Housing 30 forms a cooling chamber 31 disposed between capacitor module 10 and power circuit board module 20, through which a cooling medium, such as water, can flow. Cooling chamber 31 has a first sidewall 1 facing capacitor module 10 and a second sidewall 2 facing power circuit board module 20. Heat generated by capacitor module 10 is transferred to the cooling medium via first sidewall 1, while heat generated by power circuit board module 20 is transferred to the cooling medium via second sidewall 2. Thus, the cooling medium in cooling chamber 31 can simultaneously cool capacitor module 10 and power circuit board module 20. A thermally conductive gel is applied between capacitor module 10 and first sidewall 1, and between power circuit board module 20 and second sidewall 2. This gel increases thermal conductivity, thereby achieving high cooling efficiency. Furthermore, the gel provides electrical insulation, thereby creating an efficient heat transfer path without affecting the performance of electronic components.

[0028] like Figure 3 As shown, a plurality of cooling fins 3 are provided in the cooling chamber 31. These cooling fins extend vertically from at least one of the first side wall 1 and the second side wall 2 into the cooling chamber 31. The cooling fins 3 significantly increase the contact area with the coolant, thereby effectively improving the cooling efficiency of the cooling chamber 31. This allows the heat generated by the capacitor module 10 and the power circuit board module 20 to be dissipated as quickly as possible, ensuring that the power conversion device 100 operates at a relatively low temperature, particularly below 110°C. This improves the operating efficiency and service life of the power conversion device 100. In particular, the cooling fins 3 extend continuously vertically from the first side wall 1 to the second side wall 2 to maximize the contact area with the coolant in the cooling chamber 31. However, it is also possible for the cooling fins 3 to only partially extend into the cooling chamber 31.

[0029] For example, Figure 3 As shown, the cross-sectional shape of the cooling fins 3 is evenly distributed across the main extension plane to achieve a uniform cooling effect. In particular, the cross-sectional shape of the cooling fins 3 can be selected from the following group: circular, elliptical, teardrop-shaped, polygonal, corrugated, and needle-shaped. The desired cooling performance can be achieved by adjusting the cross-sectional shape of the cooling fins 3. Of course, other cross-sectional shapes deemed appropriate by those skilled in the art are also conceivable.

[0030] For example, the cooling fins 3 and the cooling chamber 31 are constructed as an integrally molded part. This enables a cost-effective assembly process for the housing 30. However, it is also possible that the cooling fins 3 and the cooling chamber 31 are constructed separately and then fixedly connected together through a subsequent process, such as welding. In this case, the housing 30 is particularly made of a metal material, such as aluminum, which can advantageously increase the thermal conductivity of the housing 30 and the cooling chamber 31, thereby achieving high cooling efficiency. It is also conceivable that the housing 30 includes, for example, multiple parts made of different materials, which are fixed together. In particular, the housing 30 can also be configured to encapsulate the power circuit board module 20.

[0031] For example, housing 30 is provided with additional cooling chambers on the sides of capacitor module 10 and power circuit board module 20, respectively, facing away from cooling chamber 31. Cooling medium also flows through these additional cooling chambers, providing additional cooling for capacitor module 10 and power circuit board module 20. If desired, cooling fins extending in the height direction may also be provided in the additional cooling chambers. For simplicity, the additional cooling chambers are not shown in the drawings.

[0032] For example, Figure 3 As shown, the cooling chamber 31 has a fluid inlet 4 and a fluid outlet 5. The cooling medium enters the cooling chamber 31 through the fluid inlet and flows out through the fluid outlet. The fluid inlet 4 and the fluid outlet 5 are arranged at diagonally opposite corners relative to each other in the cooling chamber 31. This can increase the flow length of the cooling medium in the cooling chamber 31, thereby correspondingly extending the flow time of the cooling medium in the cooling chamber 31, thereby improving the cooling effect of the cooling chamber 31.

[0033] For example, Figure 1 、 Figure 2a and Figure 2b As shown, the power conversion device 100 further includes an inductor module 40, which is configured to perform energy storage, current regulation, and filtering functions and works together with the capacitor module 10 and the power circuit board module 20 to ensure efficiency and stability of power conversion. The inductor module 40 is arranged side by side with the capacitor module 10 and the power circuit board module 20. In particular, a cooling medium also flows through the inductor module 40 to dissipate heat generated by the inductor module 40.

[0034] For example, Figure 2a and Figure 2bAs shown, the power conversion device 100 includes a cooling medium supply line 51 and a cooling medium discharge line 52, each of which is in fluid communication with the cooling chamber 31. The cooling medium supply line 51 is connected to the fluid inlet 4, and the cooling medium discharge line 52 is connected to the fluid outlet 5. Arrow P indicates the flow direction of the cooling medium in the power conversion device 100. Here, the cooling medium can first flow through the inductor module 40, then pass through the cooling chamber 31, flow through the capacitor module 10 and the power circuit board module 20, and finally flow back through the inductor module 40, thereby cooling each module in the power conversion device 100.

[0035] The above explanation of the embodiments only describes the present invention within the framework of the examples. Of course, as long as it makes sense technically, the individual features of the embodiments can be freely combined with each other without departing from the framework of the present invention.

[0036] Other advantages and alternative embodiments of the present invention will be readily apparent to those skilled in the art. Therefore, the present invention, in its broader aspects, is not limited to the specific details, representative configurations, and exemplary embodiments shown and described. Rather, various modifications and substitutions may be made by those skilled in the art without departing from the basic spirit and scope of the present invention.

Claims

1. A power conversion device (100), characterized in that: The power conversion device (100) comprises at least: - a capacitor module (10); - a power circuit board module (20), the power circuit board module (20) and the capacitor module (10) being arranged one above the other and spaced apart in a height direction perpendicular to the main extension plane; and - a housing (30), the housing (30) being configured to at least partially encapsulate the capacitor module (10), wherein the housing (30) forms a cooling chamber (31) arranged between the capacitor module (10) and the power circuit board module (20), the cooling chamber (31) having a first side wall (1) facing the capacitor module (10) and a second side wall (2) facing the power circuit board module (20) and being configured to be suitable for a cooling medium to flow through, wherein a plurality of cooling fins (3) are provided in the cooling chamber (31), the cooling fins (3) extending from at least one of the first side wall (1) and the second side wall (2) in the height direction into the cooling chamber (31).

2. The power conversion device (100) according to claim 1, characterized in that The cooling fins (3) extend continuously from the first side wall (1) to the second side wall (2) in the height direction.

3. The power conversion device (100) according to claim 1 or 2, characterized in that: The cross-sectional shape of the cooling fin (3) is selected from the following group: circular, elliptical, teardrop-shaped, polygonal, corrugated, needle-shaped; and / or The cooling fins (3) are evenly distributed on the main extension plane.

4. The power conversion device (100) according to claim 1 or 2, characterized in that The cooling chamber (31) has a fluid inlet (4) and a fluid outlet (5), and the fluid inlet (4) and the fluid outlet (5) are arranged at diagonally opposite corners of the cooling chamber (31) relative to each other.

5. The power conversion device (100) according to claim 1 or 2, characterized in that: The cooling fins (3) and the cooling chamber (31) are constructed as an integrally formed part; and / or The housing (30) is made of metal material; and / or The housing (30) is also configured to encapsulate the power circuit board module (20).

6. The power conversion device (100) according to claim 1 or 2, characterized in that: Thermal conductive gel is applied between the capacitor module (10) and the first side wall (1) and between the power circuit board module (20) and the second side wall (2).

7. The power conversion device (100) according to claim 1 or 2, characterized in that: The housing (30) is provided with an additional cooling chamber on a side of the capacitor module (10) and / or the power circuit board module (20) facing away from the cooling chamber (31).

8. The power conversion device (100) according to claim 1 or 2, characterized in that: The power conversion device (100) further includes an inductor module (40), which is arranged side by side with the capacitor module (10) and the power circuit board module (20), wherein the cooling medium also flows through the inductor module (40).

9. The power conversion device (100) according to claim 1 or 2, characterized in that: The power conversion device (100) comprises a cooling medium supply pipeline (51) and a cooling medium discharge pipeline (52), wherein the cooling medium supply pipeline (51) and the cooling medium discharge pipeline (52) are respectively in fluid communication with the cooling chamber (31).

10. The power conversion device (100) according to claim 1 or 2, characterized in that: The power conversion device (100) is configured as a DCDC converter for a fuel cell system.

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