Power conversion device

Abstract

The present invention relates to the technical field of power modules, and in particular to a power conversion device. The power conversion device comprises a housing and a printed circuit board; the printed circuit board comprises an input board portion, a power board portion and an output board portion, the input board portion is used to install an input connector and an input filter, the power board portion is used to install a DC-DC power module, and the output board portion is used to install an output filter and an output connector; a first notch is provided between the input board portion and the power board portion, and a second notch is provided between the power board portion and the output board portion; the printed circuit board is installed in the housing, the housing comprises a box body and a cover plate, a first partition plate and a second partition plate are provided in the box body, and the housing, the first partition plate and the second partition plate are all conductive structures; the bottoms of the first partition plate and the second partition plate are both connected to the bottom of the box body, and the tops pass through the first notch and the second notch respectively to abut against the cover plate. The above-mentioned power conversion device has high electromagnetic compatibility, occupies a small space, is easy to install, and ensures conversion efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of power modules, and in particular to a power conversion device. Background Art

[0002] DC-DC power modules have been widely used in military and industrial fields due to their significant advantages such as high power density, small size, reliable performance, easy use, and effective shortening of related product development and verification cycles.

[0003] The MOSFET inside the DC-DC power module, which acts as a switch and rectifier, works in a high-energy, high-speed switching state, so it will generate large electromagnetic interference, causing many problems to the system where the DC-DC power module is located. At present, there are two main countermeasures for the electromagnetic compatibility problem of DC / DC power modules: one is soft switching technology to reduce electromagnetic interference from the source, but this measure will reduce the power conversion efficiency and is costly; the other is to use encapsulated filters and encapsulated power modules, and then use shielded wires to connect the two in series. This measure of encapsulating the filter and power module separately will increase the volume, and the use of shielded wires in the middle adds additional parts that need to be processed (for example: not only do you need to pay attention to the installation and routing direction of the cable so that it cannot be coupled with the filter input, but you also need to consider how to bundle the cables).

[0004] In summary, how to overcome the above-mentioned defects of the existing DC-DC power supply module is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a power conversion device to alleviate the technical problems of DC-DC power modules in the prior art, such as reduced power conversion efficiency, increased cost, or increased volume and complicated processing while improving electromagnetic compatibility.

[0006] The power conversion device provided by the present invention comprises a housing and a printed circuit board;

[0007] The printed circuit board comprises an input board portion, a power board portion and an output board portion, wherein the input board portion is used to install an input connector and an input filter, the power board portion is used to install a DC-DC power module, and the output board portion is used to install an output filter and an output connector, wherein the input connector, the input filter, the DC-DC power module, the output filter and the output connector are electrically connected in sequence; a first strip-shaped notch is provided between the input board portion and the power board portion, and a second strip-shaped notch is provided between the power board portion and the output board portion.

[0008] The printed circuit board is installed in the shell, the shell includes a box body and a cover plate, the box body is provided with a first partition and a second partition, the shell, the first partition and the second partition are all conductive structures; the bottoms of the first partition and the second partition are connected to the bottom of the box body, the top of the first partition passes through the first slot and abuts against the cover plate, and the top of the second partition passes through the second slot and abuts against the cover plate.

[0009] Preferably, as an implementable embodiment, the input filter is electrically connected to the DC-DC power supply module via a first wire, and the DC-DC power supply module is electrically connected to the output filter via a second wire.

[0010] The first notch extends from the edge of the printed circuit board to a position close to where the first wire is arranged, and the second notch extends from the edge of the printed circuit board to a position close to where the second wire is arranged.

[0011] Preferably, as an implementation method, the first partition and the second partition divide the box body into three cavities, the cavity between the first partition and the second partition is used to accommodate the DC-DC power supply module, the cavity located on the side of the first partition away from the second partition is used to accommodate the input connector and the input filter, and the cavity located on the side of the second partition away from the first partition is used to accommodate the output filter and the output connector.

[0012] Preferably, as an implementation mode, the top of the first partition and the top of the second partition both include a protrusion and a recessed portion, the protrusion of the first partition passes through the first slot to abut against the cover plate, and the protrusion of the second partition passes through the second slot to abut against the cover plate.

[0013] The board surface on which the first wire is laid is the first connecting board portion, and the board surface on which the second wire is laid is the second connecting board portion; the recessed portion of the first partition is located directly below the first connecting board portion and there is a gap between the recessed portion and the first connecting board portion, and the recessed portion of the second partition is located directly below the second connecting board portion and there is a gap between the recessed portion and the second connecting board portion.

[0014] Preferably, as an implementation mode, the gap size between the recessed portion of the first partition and the first connecting plate portion is between 0.1 mm and 0.3 mm, and the gap size between the recessed portion of the second partition and the second connecting plate portion is between 0.1 mm and 0.3 mm.

[0015] Preferably, as an implementation mode, a first U-shaped groove and a second U-shaped groove are provided on the cover plate, the protrusion of the first partition passes through the first notch to cooperate with the first U-shaped groove, and the protrusion of the second partition passes through the second notch to cooperate with the second U-shaped groove.

[0016] Preferably, as an implementation method, conductive sealing strips are installed in both the first U-shaped groove and the second U-shaped groove, the protrusion of the first partition abuts against the conductive sealing strip in the first U-shaped groove, and the protrusion of the second partition abuts against the conductive sealing strip in the second U-shaped groove.

[0017] Preferably, as an implementable embodiment, the input connector and the output connector are both metal structures, and the input connector and the output connector are tightly connected to the housing.

[0018] Preferably, as an implementable embodiment, a high-frequency filter circuit module is provided at both the input pin and the output pin of the DC-DC power supply module.

[0019] Preferably, as an implementable embodiment, the low-frequency signal line at the output end of the input filter is connected to the low-frequency signal line at the input end of the DC-DC power module through a first threaded feedthrough capacitor, and the low-frequency signal line at the output end of the DC-DC power module is connected to the low-frequency signal line at the input end of the output filter through a second threaded feedthrough capacitor; the first threaded feedthrough capacitor is installed on the first partition, and the second threaded feedthrough capacitor is installed on the second partition.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] In the power conversion device provided by the present invention, the input filter can filter the interference signal input from the outside to prevent the interference signal input from the outside from affecting the normal conversion work of the DC-DC power module. At the same time, the input filter can also prevent the interference generated by the DC-DC power module from flowing out from the input connector along the power line and interfering with the external space environment; similarly, the output filter can filter the signal converted by the DC-DC power module to prevent the interference signal generated by the DC-DC power module from flowing out from the output connector along the power line and interfering with the external space environment. At the same time, the output filter can also prevent the external space from interfering with the DC-DC power module and affecting the normal conversion work of the DC-DC power module. That is to say, the input filter and the output filter can reduce or even eliminate the conducted interference from the external environment to the DC-DC power module, and can reduce the conducted interference generated by the DC-DC power module to the external environment.

[0022] The first partition with conductive properties can separate the input board part and the power board part on both sides thereof, and can cooperate with the shell with conductive properties to reduce the spatial radiation interference of the DC-DC power module installed on the power board part to the input filter installed on the input board part, thereby improving the filtering effect of the input filter and reducing the conducted interference; the second partition with conductive properties can separate the output board part and the power board part on both sides thereof, and can cooperate with the shell with conductive properties to reduce the spatial radiation interference of the DC-DC power module installed on the power board part to the output filter installed on the output board part, thereby improving the filtering effect of the output filter and reducing the conducted interference. In addition, the first partition with conductive properties, the second partition and the shell cooperate to form a good shielding effect on the DC-DC power module, reduce the spatial radiation interference caused by the electromagnetic waves generated during the working process of the DC-DC power module to the external space, and further improve the electromagnetic compatibility of the DC-DC power module.

[0023] Therefore, the power conversion device provided by the present invention improves the electromagnetic compatibility of the DC-DC power module, and saves space because the input connector, input filter, DC-DC power module, output filter and output connector are all installed on the same printed circuit board; and the printed circuit board installed with the input connector, input filter, DC-DC power module, output filter and output connector is encapsulated in a shell composed of a box body and a cover plate, which simplifies the installation process.

[0024] In addition, the power conversion device provided by the present invention does not use soft switching technology, so it will not reduce the conversion efficiency of the DC-DC power module and will not increase the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic cross-sectional view of a power conversion device provided by an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the axial structure of a cover plate in a power conversion device provided by an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the axial structure of a printed circuit board in a power conversion device provided in an embodiment of the present invention;

[0029] Figure 4A schematic diagram of the axial structure of a box body in a power conversion device provided by an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of the assembly structure of a printed circuit board provided in an embodiment of the present invention and an input connector, an input filter, a DC-DC power supply module, an output filter, an output connector, and a high-frequency filter circuit module installed thereon;

[0031] Figure 6 A schematic diagram of a partial cross-sectional structure of another cross-sectional surface of a power conversion device provided by an embodiment of the present invention;

[0032] Figure 7 A bottom view structural schematic diagram of an upper cover plate provided in an embodiment of the present invention;

[0033] Figure 8 A schematic diagram of an exploded structure of another power conversion device provided by an embodiment of the present invention;

[0034] Fig. 9 A schematic cross-sectional structure diagram of another power conversion device provided by an embodiment of the present invention, wherein the first connecting plate portion and the second connecting plate portion are flexible structures.

[0035] Icons: 1-box; 2-cover; 3-printed circuit board; 4-input connector; 5-input filter; 6-DC-DC power supply module; 7-output filter; 8-output connector; 9-high-frequency filter circuit module;

[0036] 11 - first partition; 12 - second partition; 13 - protrusion; 14 - recess; 15 - first threaded through-hole capacitor; 16 - second threaded through-hole capacitor;

[0037] 21 - first U-shaped groove; 22 - second U-shaped groove; 23 - conductive sealing strip;

[0038] 31 - input board portion; 32 - power board portion; 33 - output board portion; 34 - first notch; 35 - second notch; 36 - first connecting board portion; 37 - second connecting board portion. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The present invention is further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0043] See also Figure 1 - Figure 5 , Figure 8 and Fig. 9 This embodiment provides a power conversion device, including a housing and a printed circuit board 3.

[0044] The printed circuit board 3 includes an input board portion 31, a power board portion 32 and an output board portion 33. The input board portion 31 is used to install an input connector 4 and an input filter 5, the power board portion 32 is used to install a DC-DC power module 6, and the output board portion 33 is used to install an output filter 7 and an output connector 8. The input connector 4, the input filter 5, the DC-DC power module 6, the output filter 7 and the output connector 8 are electrically connected in sequence; a first strip-shaped notch 34 is provided between the input board portion 31 and the power board portion 32, and a second strip-shaped notch 35 is provided between the power board portion 32 and the output board portion 33.

[0045] The printed circuit board 3 is installed in the shell, and the shell includes a box body 1 and a cover plate 2. The box body 1 is provided with a first partition plate 11 and a second partition plate 12. The shell, the first partition plate 11 and the second partition plate 12 are all conductive structures; the bottoms of the first partition plate 11 and the second partition plate 12 are connected to the bottom of the box body 1, the top of the first partition plate 11 passes through the first slot 34 to abut against the cover plate 2, and the top of the second partition plate 12 passes through the second slot 35 to abut against the cover plate 2.

[0046] In the power conversion device provided in this embodiment, the input filter 5 can filter the interference signal input from the outside to prevent the interference signal input from the outside from affecting the normal conversion work of the DC-DC power module 6. At the same time, the input filter 5 can also prevent the interference generated by the DC-DC power module 6 from flowing out from the input connector 4 along the power line and interfering with the external space environment; similarly, the output filter 7 can filter the signal converted by the DC-DC power module 6 to prevent the interference signal generated by the DC-DC power module 6 from flowing out from the output connector 8 along the power line and interfering with the external space environment. At the same time, the output filter 7 can also prevent the external space from interfering with the DC-DC power module 6 and affecting the normal conversion work of the DC-DC power module 6. That is to say, the input filter 5 and the output filter 7 can reduce or even eliminate the conducted interference from the external environment to the DC-DC power module 6, and can reduce the conducted interference generated by the DC-DC power module 6 to the external environment.

[0047] The first partition plate 11 with conductive properties can divide the input plate portion 31 and the power plate portion 32 on both sides thereof, and can cooperate with the shell with conductive properties to reduce the spatial radiation interference of the DC-DC power module 6 installed on the power plate portion 32 to the input filter 5 installed on the input plate portion 31, thereby improving the filtering effect of the input filter 5 and reducing the conducted interference; the second partition plate 12 with conductive properties can divide the output plate portion 33 and the power plate portion 32 on both sides thereof, and can cooperate with the shell with conductive properties to reduce the spatial radiation interference of the DC-DC power module 6 installed on the power plate portion 32 to the output filter 7 installed on the output plate portion 33, thereby improving the filtering effect of the output filter 7 and reducing the conducted interference. In addition, the first partition plate 11 with conductive properties, the second partition plate 12 and the shell can cooperate with each other to form a good shielding effect on the DC-DC power module 6, reduce the spatial radiation interference caused by the electromagnetic waves generated during the working process of the DC-DC power module 6 to the external space, and further improve the electromagnetic compatibility of the DC-DC power module 6.

[0048] Therefore, the power conversion device provided in this embodiment improves the electromagnetic compatibility of the DC-DC power module 6, and because the input connector 4, the input filter 5, the DC-DC power module 6, the output filter 7 and the output connector 8 are all installed on the same printed circuit board 3, space is saved; and the printed circuit board 3 installed with the input connector 4, the input filter 5, the DC-DC power module 6, the output filter 7 and the output connector 8 is encapsulated in a shell composed of a box body 1 and a cover plate 2, which simplifies the installation process.

[0049] In addition, the power conversion device provided in this embodiment does not use soft switching technology, so it will not reduce the conversion efficiency of the DC-DC power module 6 and will not increase the cost.

[0050] The specific structure and technical effects of the technical solution of this embodiment are as follows:

[0051] For the convenience of description, the wire connecting the input filter 5 and the DC-DC power module 6 is defined as a first wire, and the wire connecting the DC-DC power module 6 and the output filter 7 is defined as a second wire.

[0052] Preferably, see Figure 3 The first notch 34 is set to extend from the edge of the printed circuit board 3 to the position where the first wire is arranged, that is, except for the board surface portion required by the first wire, the length of the first notch 34 is increased as much as possible to reduce the width of the connection portion between the input board portion 31 and the power board portion 32, thereby increasing the isolation area of ​​the first partition 11 between the space where the input filter 5 is located and the space where the DC-DC power module 6 is located, reducing the gap between the space where the DC-DC power module 6 is located and the space where the input filter 5 is located, improving the shielding effect of the first partition 11 on the DC-DC power module 6, and further reducing the electromagnetic interference generated by the DC-DC power module 6 on the input filter 5.

[0053] Similarly, the second notch 35 is set to extend from the edge of the printed circuit board 3 to the position where the second wire is arranged, that is, except for the board surface portion required for the second wire, the length of the second notch 35 is increased as much as possible to reduce the width of the connection portion between the input board portion 31 and the power board portion 32, thereby increasing the isolation area of ​​the second partition 12 between the space where the output filter 7 is located and the space where the DC-DC power module 6 is located, reducing the gap between the space where the DC-DC power module 6 is located and the space where the output filter 7 is located, improving the shielding effect of the second partition 12 on the DC-DC power module 6, and further reducing the electromagnetic interference generated by the DC-DC power module 6 on the output filter 7.

[0054] See also Figure 4 The first partition 11 and the second partition 12 divide the box body 1 into three cavities, that is, both ends of the first partition 11 and the second partition 12 are connected to the side walls of the box body 1; wherein, the cavity between the first partition 11 and the second partition 12 is used to accommodate the DC-DC power supply module 6, the cavity located on the side of the first partition 11 away from the second partition 12 is used to accommodate the input connector 4 and the input filter 5, and the cavity located on the side of the second partition 12 away from the first partition 11 is used to accommodate the output filter 7 and the output connector 8.

[0055] Preferably, see Figure 4The top of the first partition 11 and the top of the second partition 12 both include a protrusion 13 and a recessed portion 14, wherein the protrusion 13 of the first partition 11 can pass through the first notch 34 to abut against the cover plate 2, and the protrusion 13 of the second partition 12 can pass through the second notch 35 to abut against the cover plate 2; for the convenience of description, the board surface where the first wire is laid is defined as the first connecting plate portion 36, and the board surface where the second wire is laid is defined as the second connecting plate portion 37, and the recessed portion 14 of the first partition 11 is arranged directly below the first connecting plate portion 36, and on the first partition A gap is set between the recessed portion 14 of 11 and the first connecting plate to prevent the first partition 11 with conductive properties from contacting the first wire on the first connecting plate portion 36 and affecting the insulation between the housing and the printed circuit board 3; at the same time, the recessed portion 14 of the second partition 12 is set directly below the second connecting plate portion 37, and a gap is set between the recessed portion 14 of the second partition 12 and the second connecting plate to prevent the second partition 12 with conductive properties from contacting the second wire on the second connecting plate portion 37 and affecting the insulation between the housing and the printed circuit board 3.

[0056] Specifically, the gap size between the recessed portion 14 of the first partition 11 and the first connecting plate portion 36 can be set between 0.1mm and 0.3mm, and the gap size between the recessed portion 14 of the second partition 12 and the second connecting plate portion 37 can be set between 0.1mm and 0.3mm, thereby ensuring the insulation between the printed circuit board 3 and the outer casing while ensuring the shielding effect of the first partition 11 and the second partition 12 on the DC-DC power supply module 6.

[0057] Preferably, the gap size between the recessed portion 14 of the first partition 11 and the first connecting plate portion 36 can be set to 0.2 mm, and the gap size between the recessed portion 14 of the second partition 12 and the second connecting plate portion 37 can be set to 0.2 mm, so as to achieve a balance between the insulation between the printed circuit board 3 and the outer casing and the shielding effect of the first partition 11 and the second partition 12 on the DC-DC power supply module 6.

[0058] Preferably, see Figure 2 A first U-shaped groove 21 and a second U-shaped groove 22 can be provided on the cover plate 2, so that the protrusion 13 of the first partition plate 11 can cooperate with the first U-shaped groove 21 after passing through the first slot 34, and the protrusion 13 of the second partition plate 12 can cooperate with the second U-shaped groove 22 after passing through the second slot 35, thereby limiting the first partition plate 11 and the second partition plate 12 by utilizing the first U-shaped groove 21 and the second U-shaped groove 22.

[0059] For further information, see Figure 7A conductive sealing strip 23 can be installed in the first U-shaped groove 21 and the second U-shaped groove 22, and the protrusion 13 of the first partition 11 can abut against the conductive sealing strip 23 in the first U-shaped groove 21, and the protrusion 13 of the second partition 12 abuts against the conductive sealing strip 23 in the second U-shaped groove 22, so that the conductive sealing strip 23 is used to fill the conductive discontinuity between the first partition 11 and the first U-shaped groove 21 and the conductive discontinuity between the second partition 12 and the second U-shaped groove 22, thereby improving the electromagnetic shielding effect of the first partition 11 and the second partition 12 on the DC-DC power supply module 6 after they are matched with the shell, and further reducing the influence of the DC-DC power supply module 6 on the filtering effect of the input filter 5 and the output filter 7.

[0060] Preferably, the input connector 4 and the output connector 8 are both set to metal structures, and the input connector 4 and the output connector 8 are tightly connected to the shell, thereby reducing the holes on the shell where electromagnetic leakage is prone to occur at the positions connecting the input connector 4 and the output connector 8, improving the electromagnetic shielding effect of the shell, reducing the electromagnetic radiation interference of the external space on the power conversion device provided by this embodiment, and at the same time, reducing the electromagnetic radiation interference of the power conversion device provided by this embodiment on the external space.

[0061] Also, see Figure 5 A high-frequency filter circuit module 9 is provided at both the input pin and the output pin of the DC-DC power supply module 6, so as to filter the DC-DC power supply module 6 by using the high-frequency filter circuit module 9 to reduce the high-frequency noise on the power line.

[0062] See also Figure 6 Due to the spatial electromagnetic radiation interference of the DC-DC power module 6, high-frequency interference is also coupled to the low-frequency signal line. Therefore, the low-frequency signal line at the output end of the input filter 5 can be connected to the low-frequency signal line at the input end of the DC-DC power module 6 through the first threaded through-core capacitor 15, and the low-frequency signal line at the output end of the DC-DC power module 6 can be connected to the low-frequency signal line at the input end of the output filter 7 through the second threaded through-core capacitor 16, so as to achieve high-frequency filtering on the low-frequency signal line; the first threaded through-core capacitor 15 can be installed on the first partition plate 11, and the second threaded through-core capacitor 16 can be installed on the second partition plate 12 to achieve fixation.

[0063] In summary, the embodiment of the present invention discloses a power conversion device, which overcomes many technical defects of the traditional DC-DC power module. The power conversion device provided by the embodiment of the present invention has high electromagnetic compatibility, small space occupation, simple installation, and guaranteed conversion efficiency.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 by 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 invention.

[0065] In addition, it will be understood by those skilled in the art that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and to form different embodiments. For example, in the above claims, any one of the embodiments claimed for protection may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present invention, and should not be regarded as admitting or suggesting in any form that the information constitutes prior art known to those skilled in the art. In addition, it will be understood by those skilled in the art that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and to form different embodiments. For example, in the above claims, any one of the embodiments claimed for protection may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present invention, and should not be regarded as admitting or suggesting in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A power conversion device, characterized in that: Including housing and printed circuit board; Wherein, the printed circuit board comprises an input board portion, a power board portion and an output board portion, the input board portion is used to install an input connector and an input filter, the power board portion is used to install a DC-DC power module, the output board portion is used to install an output filter and an output connector, the input connector, the input filter, the DC-DC power module, the output filter and the output connector are electrically connected in sequence; a first strip-shaped notch is provided between the input board portion and the power board portion, and a second strip-shaped notch is provided between the power board portion and the output board portion; The printed circuit board is installed in the shell, the shell includes a box body and a cover plate, the box body is provided with a first partition plate and a second partition plate, the shell, the first partition plate and the second partition plate are all conductive structures; the bottoms of the first partition plate and the second partition plate are both connected to the bottom of the box body, the top of the first partition plate passes through the first notch and abuts against the cover plate, and the top of the second partition plate passes through the second notch and abuts against the cover plate; The input filter is electrically connected to the DC-DC power supply module via a first wire, and the DC-DC power supply module is electrically connected to the output filter via a second wire; The first notch extends from the edge of the printed circuit board to a position close to the first wire arrangement, and the second notch extends from the edge of the printed circuit board to a position close to the second wire arrangement; The first partition plate and the second partition plate divide the box body into three cavities, the cavity between the first partition plate and the second partition plate is used to accommodate the DC-DC power supply module, the cavity located on the side of the first partition plate away from the second partition plate is used to accommodate the input connector and the input filter, and the cavity located on the side of the second partition plate away from the first partition plate is used to accommodate the output filter and the output connector; The top of the first partition plate and the top of the second partition plate both include a protrusion and a recess, the protrusion of the first partition plate passes through the first notch to abut against the cover plate, and the protrusion of the second partition plate passes through the second notch to abut against the cover plate; The board surface where the first wire is laid is the first connecting board part, and the board surface where the second wire is laid is the second connecting board part; the recessed part of the first partition is located directly below the first connecting board part and there is a gap between the first connecting board part, and the recessed part of the second partition is located directly below the second connecting board part and there is a gap between the second connecting board part; The size of the gap between the recessed portion of the first partition and the first connecting plate portion is between 0.1 mm and 0.3 mm, and the size of the gap between the recessed portion of the second partition and the second connecting plate portion is between 0.1 mm and 0.3 mm; The cover plate is provided with a first U-shaped groove and a second U-shaped groove, the protrusion of the first partition plate passes through the first notch and cooperates with the first U-shaped groove, and the protrusion of the second partition plate passes through the second notch and cooperates with the second U-shaped groove.

2. The power conversion device according to claim 1, characterized in that: Conductive sealing strips are installed in both the first U-shaped groove and the second U-shaped groove. The protrusion of the first partition plate abuts against the conductive sealing strip in the first U-shaped groove, and the protrusion of the second partition plate abuts against the conductive sealing strip in the second U-shaped groove.

3. The power conversion device according to claim 1 or 2, characterized in that: The input connector and the output connector are both metal structures, and the input connector and the output connector are tightly connected to the housing.

4. The power conversion device according to claim 1 or 2, characterized in that: The input pin and output pin of the DC-DC power supply module are both provided with high-frequency filter circuit modules.

5. The power conversion device according to claim 1 or 2, characterized in that: The low-frequency signal line at the output end of the input filter is connected to the low-frequency signal line at the input end of the DC-DC power module through a first threaded feedthrough capacitor, and the low-frequency signal line at the output end of the DC-DC power module is connected to the low-frequency signal line at the input end of the output filter through a second threaded feedthrough capacitor; the first threaded feedthrough capacitor is installed on the first partition, and the second threaded feedthrough capacitor is installed on the second partition.

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