Power assembly and liquid cooling converter

Abstract

The utility model discloses a power assembly and a liquid cooling converter. The power assembly comprises a capacitor module and a power module. The capacitor module comprises a direct-current capacitor cell and a capacitor busbar, and the direct-current capacitor cell is divided into a first capacitor cell and a second capacitor cell; the capacitor busbar is formed by laminating a neutral pole plate, a first pole plate and a second pole plate, and is provided with a first area and a second area which are not overlapped or partially overlapped. The first capacitor pool is arranged in the first area and is connected with the first polar plate and the neutral polar plate; the second capacitor pool is arranged in the second area and is connected with the second polar plate and the neutral polar plate. The power module comprises a power tube group and a wiring component, and the power tube group comprises a plurality of switching devices and is connected to the capacitor busbar through the wiring component. Wherein the switching device connected with the first polar plate and the neutral polar plate is a first switch, and the switching device connected with the second polar plate and the neutral polar plate is a second switch. According to the power assembly, the problems of large weight and high manufacturing cost of the existing power assembly can be solved.

Description

Technical Field

[0001] This utility model relates to the field of converter technology, specifically to a power component and a liquid-cooled converter. Background Technology

[0002] Converters are widely used in power systems, rail transportation, military industry, petroleum machinery, new energy vehicles, wind power generation, solar photovoltaic and other fields. They connect the battery system to the power grid to realize bidirectional conversion of electrical energy, control the charging and discharging process of the battery, and perform AC-DC conversion. In the absence of a power grid, they can directly supply power to AC loads. At the same time, NPC (Neutral Point Clamp) or ANPC (Active Neutral Point Clamp) three-level topologies can use IGBT devices with low blocking voltage to increase the DC bus voltage, thereby increasing the AC output voltage and expanding the system power level. Therefore, they are widely used in converters.

[0003] Conventionally, a converter mainly includes a power module, which is used to achieve bidirectional conversion between DC and AC power. The power module in a converter generally includes a capacitor module and a power module. The capacitor module mainly includes a DC capacitor bank and a capacitor busbar, while the power module mainly includes power transistors and a heat sink. The power transistors are mounted on the heat sink and then connected to the DC busbar via the input busbar. For details, refer to... Figure 1 This diagram illustrates the structure of a power assembly within a converter in the prior art. The power assembly may include a capacitor busbar 01, a DC capacitor bank 02, an input busbar 03, power transistor banks 04, an output busbar 05, and a heat sink 06. The input busbar 03, power transistor banks 04, and output busbar 05 constitute the aforementioned power module. The power transistor banks 04 are mounted on the heat sink 06, which is an air-cooled heat sink with heat dissipation fins on its back. Therefore, the input busbar 03, power transistor banks 04, and output busbar 05 are all mounted on the front of the heat sink 06. Since the power device outputs three-phase AC power, its power module includes three power transistor banks 04 and three corresponding heat sinks 06. Each power transistor bank 04 is mounted on one heat sink 06, and the input busbar 03 of all three power modules is connected to the capacitor busbar 01. Furthermore, the capacitor busbar 01 includes a first plate, a second plate, and a neutral plate, which are stacked and separated from each other by an insulating plate; correspondingly, the input busbar 03 in each power module also includes a first plate, a second plate, and a neutral plate, and is connected to each plate in the capacitor busbar 01.

[0004] Reference Figure 2It illustrates a circuit diagram of a three-level topology in the prior art. For power components employing a three-level topology, the aforementioned power transistor group 04 typically includes three IGBT devices in each complete three-level topology, corresponding to... Figure 2 In the circuit shown, transistors 1 and 2 form an input circuit, transistors 3 and 4 form another input circuit, and transistors 5 and 6 form the output circuit. The first terminal of transistor 1 is connected to the first plate of the capacitor busbar, and the first terminal of transistor 2 is connected to the neutral plate of the capacitor busbar. The second terminals of transistors 1 and 2 are connected and then connected to the first terminal of transistor 5. The first terminal of transistor 3 is connected to the second plate of the capacitor busbar, and the first terminal of transistor 4 is connected to the neutral plate of the capacitor busbar. The second terminals of transistors 3 and 4 are connected and then connected to the first terminal of transistor 6. The second terminals of transistors 5 and 6 are then connected to the output circuit. The capacitor pool connected to the capacitor busbar is further divided into two parts, corresponding to... Figure 2 C1 and C2 in the example.

[0005] In existing power components, components such as capacitor buses, heat sinks, DC capacitor banks, input busbars, and output busbars are all made of metal, which results in heavy weight and high manufacturing costs, which have an adverse impact on transportation, installation, and reducing the overall cost of the device. Utility Model Content

[0006] The purpose of this utility model is to overcome the above-mentioned defects or problems in the background art and provide a power component that can improve the problems of large weight and high manufacturing cost of existing power components.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] Technical Solution 1: A power component comprising: a capacitor module, including a DC capacitor bank and a capacitor busbar; the DC capacitor bank including a first capacitor bank and a second capacitor bank; the capacitor busbar including a neutral plate and a first plate and a second plate stacked with the neutral plate, and having a first region and a second region that do not overlap or only partially overlap; the first plate and the neutral plate are stacked in the first region, and the first plate and the neutral plate are stacked in the second region; the first capacitor bank is located in the first region and connected to the first plate and the neutral plate, and the second capacitor bank is located in the second region and connected to the second plate and the neutral plate; and a power module including a power transistor group and a wiring component; the power transistor group including a plurality of switching devices, some of which are connected to the capacitor busbar through the wiring component; wherein, the switching device connected to the first plate and the neutral plate at a first wiring portion located in the first region is a first switch, and the switching device connected to the second plate and the neutral plate at a second wiring portion located in the second region is a second switch.

[0009] Technical Solution 2 based on Technical Solution 1: The neutral electrode plate includes a first plate stacked with the first electrode plate and a second plate stacked with the second electrode plate. The first plate and the second plate are independent of each other and connected by a neutral wiring assembly, and they respectively correspond to the first region and the second region mentioned above. The first electrode plate and the first plate cooperate to form a first busbar, and the second electrode plate and the second plate cooperate to form a second busbar.

[0010] Technical Solution 3 based on Technical Solution 2: The planes where the first busbar and the second busbar are located intersect; the power module is located between the sides of the first busbar and the second busbar that are closer to each other.

[0011] Technical Solution 4 based on Technical Solution 3: The second busbar forms a bent docking portion near the second wiring section, which is bent relative to the plane of the second busbar, and the plane of the bent docking portion is parallel to the plane of the first busbar; the neutral wiring assembly is connected to the bent docking portion.

[0012] Technical Solution 5 based on Technical Solution 4: The bending direction of the bent connection part is towards the position where the first capacitor bank is located on the first busbar; the second electrode plate includes a second main plate and an output plate; the bent connection part on the second electrode plate is located on the second main plate, the output plate is connected to the bent connection part on the second main plate through a second wiring assembly and extends in the opposite direction to the bending direction of the bent connection part to form a second output terminal; the first electrode plate extends in the extension direction of the second output terminal to form a first wiring terminal.

[0013] Technical Solution Six based on Technical Solution Five: The neutral wiring assembly is connected to the third wiring portion on the first board, and the second wiring assembly is connected to the fourth wiring portion on the output board. Both the third and fourth wiring portions are located in the second region. The first busbar is provided with a current-carrying portion having a preset width in the preset direction. The current-carrying portion is located between the third and fourth wiring portions and the first and second outgoing terminals in the preset direction. The output board is stacked with the first busbar.

[0014] Technical solution seven based on technical solution six: The power module includes a mounting base, the mounting base having a first mounting surface and a second mounting surface that are opposite to each other, the first switch being mounted on the first mounting surface, and the second switch being mounted on the second mounting surface; the mounting base is located between the first electrode plate and the second electrode plate, and the first mounting surface is closer to the first electrode plate relative to the second mounting surface, and the second mounting surface is closer to the second electrode plate relative to the first mounting surface, wherein when the planes of the first electrode plate and the second electrode plate are perpendicular, the first mounting surface is perpendicular to the plane of the first electrode plate, and the second mounting surface is parallel to the plane of the second electrode plate.

[0015] Technical solution eight based on technical solution seven: the first busbar is arranged in layers from farthest to nearth of the first mounting surface as a first electrode plate and a first plate component, and the second busbar is arranged in layers from farthest to nearth of the second mounting surface as a second plate component and a second electrode plate.

[0016] Technical Solution Nine based on Technical Solution Eight: The wiring component includes a first wiring assembly and a second wiring assembly; the first wiring assembly includes a first busbar and a second busbar stacked together; each first switch is arranged along a first direction on a first mounting surface; both the first busbar and the second busbar extend along the first direction and are connected to each first switch; both the first busbar and the second busbar have a first connecting portion and a second connecting portion; the first connecting portion connects to each first switch, and its plane is parallel to the first mounting surface; the second connecting portion connects to the first busbar, and its plane is perpendicular to the first mounting surface; The second wiring assembly includes a third busbar and a fourth busbar stacked in a layered manner; each of the second switches is arranged along a first direction on the second mounting surface; the third busbar and the fourth busbar both extend along the first direction and are connected to each of the second switches; each of the third busbar and the fourth busbar has a third connecting portion, a fourth connecting portion, and a turning portion; the third connecting portion connects each of the second switches, and its plane is parallel to the second mounting surface; the fourth connecting portion connects the second busbar, and its plane is parallel to the second mounting surface; the turning portion connects the third connecting portion and the fourth connecting portion, and its plane is perpendicular to the second mounting surface.

[0017] In addition, this utility model also provides technical solution ten: a liquid-cooled converter, which includes a converter cabinet, wherein the converter cabinet is equipped with power components as described in any one of technical solutions one to nine, and the power components dissipate heat through liquid cooling.

[0018] As can be seen from the above description of this utility model, compared with the prior art, this utility model has the following beneficial effects:

[0019] Technical solution one provides a power component, which includes a capacitor module and a power module. The capacitor module includes a DC capacitor bank and a capacitor busbar. The capacitor busbar includes a first electrode plate, a second electrode plate, and a neutral electrode plate, wherein the first electrode plate, the second electrode plate, and the neutral electrode plate are stacked together. The capacitor busbar also has a first region and a second region, which do not overlap or only partially overlap. The first electrode plate and the neutral electrode plate are stacked in the first region, and the second electrode plate and the neutral electrode plate are stacked in the second region. The power module includes a power transistor group and wiring components. Some switching devices in the power transistor group are connected to the capacitor busbar through the wiring components. Since the first electrode plate and the second electrode plate are stacked on the first region and the second region of the neutral electrode plate respectively, the material usage of the first electrode plate and the second electrode plate is reduced, thereby reducing the overall weight of the capacitor busbar. The reduction in material usage also reduces manufacturing costs. The lighter weight has a beneficial effect on the installation and transportation of the power component.

[0020] Furthermore, the switching devices connected to the capacitor busbar are divided into a first switch and a second switch. The first switch is only connected to the first wiring portion of the first electrode plate and the neutral electrode plate, and the second switch is only connected to the second wiring portion of the second electrode plate and the neutral electrode plate. Since holes need to be made on the capacitor busbar when connecting the switching devices to the capacitor busbar, and since the first electrode plate and the second electrode plate are only stacked with the neutral electrode plate in the first and second regions in this technical solution, compared with the capacitor busbar structure in which the first electrode plate and the second electrode plate are stacked on the entire neutral electrode plate, the capacitor busbar in this technical solution has fewer holes on the electrode plates. Fewer holes can effectively improve the current carrying efficiency of each electrode plate. The improved current carrying efficiency allows each electrode plate to achieve the same current carrying performance in a smaller current carrying area. Therefore, the thickness of each electrode plate can be set thinner, thereby further reducing the amount of material used in the electrode plates and further improving the problems of large weight and high manufacturing cost.

[0021] Furthermore, since the first and second plates no longer have overlapping portions or only have a small number of overlapping portions, the electromagnetic coupling between the first and second plates is improved, thereby reducing mutual interference between different plates and improving the system's anti-interference capability.

[0022] In technical solution two, the neutral plate is set as an independent first plate and a second plate, and each of them cooperates with the first plate and the second plate to form a first busbar and a second busbar. This arrangement allows the neutral plate to form a stacked structure with the first plate and the second plate respectively. The relative positions of the first plate and the second plate can be arranged more flexibly, which is conducive to adapting to different power module layouts. The overall manufacturing cost and installation difficulty of the neutral plate are also reduced.

[0023] In technical solution three, the first busbar and the second busbar are set as relatively inclined or vertical structures, and the power module is placed between the first busbar and the second busbar. This can reduce the overall size of the power component, making its structure more compact, and can also reduce the distance between the power module and the capacitor busbar. In particular, the distance between the first switch and the second switch in the power module and the first capacitor bank and the second capacitor bank, respectively, is shorter. The shorter distance between the switching devices and the capacitors can effectively shorten the length of the overall commutation circuit of the power component, thereby reducing stray inductance.

[0024] In technical solution four, a bent connection section is provided on the second busbar. This bent connection section facilitates the connection of the second board to the first board, allowing the wiring positions of the second and first boards to be as close as possible while ensuring normal installation of the power module. It also reduces the distance between the first and second wiring sections, thereby shortening the commutation loop and reducing stray inductance in the overall circuit. Simultaneously, this bent connection design makes more efficient use of space, allowing for a more compact layout of the power components while maintaining good electrical performance.

[0025] In technical solution five, the bending direction of the bent connection part is towards the position of the DC capacitor bank, which can further shorten the distance between the first connection part and the second connection part and reduce stray inductance. At the same time, the second plate is divided into a second main plate and an output plate. The split design allows the special structure of the bent connection part and the second output end to be opposite in direction. This structure can not only shorten the commutation circuit to reduce stray inductance, but also facilitate the external wiring of the power components and reduce current loss.

[0026] In technical solution six, a current-carrying part is provided on the first busbar and positioned between the third and fourth connection parts. This increases the distance from the third and fourth connection parts to the first and second outgoing terminals, thereby improving the current-carrying performance of the first and second plates to the first and second outgoing terminals. This avoids a decrease in current-carrying performance due to excessive distance between the slightly distant portions of the first and second plates, which have a certain width, and the first and second outgoing terminals.

[0027] In technical solution seven, the power module also includes a mounting base, which is positioned between the first and second plates. The power transistors are divided into a first switch and a second switch, which are respectively mounted on the first and second mounting surfaces. The first switch is connected to the first plate and the second switch is connected to the second plate via wiring components. With this configuration, in conjunction with the independent first and second busbars, the positional relationship and connection distance between the first and second switches and the capacitor busbars are not affected by each other. They can be decoupled and connected to the first and second plates respectively. The commutation loop length formed between the power transistors and the capacitor busbars is shorter, thereby reducing the overall stray inductance. Furthermore, by making the planes on which the first and second pole plates are located perpendicular to each other, the first mounting surface on the mounting base is perpendicular to the first pole plate, and the second mounting surface is parallel to the second pole plate. This arrangement allows for sufficient maintenance space at the position of the first mounting surface, while at the position of the second mounting surface, the distance between the second switch and the second busbar is shorter than in the conventional arrangement. Although the first mounting surface is perpendicular to the first pole plate, the first pole plate can be placed close to the mounting base, thereby reducing the distance between the first pole plate and the first mounting surface.

[0028] In technical solution eight, the relative stacking positions of the first electrode plate, the neutral electrode plate, and the second electrode plate are defined. This arrangement can reduce the overall processing and assembly difficulty of the capacitor busbar, and make it easier to connect the first and second plates of the neutral electrode plate.

[0029] In technical solution nine, the wiring components include a first wiring component and a second wiring component. These two components can respectively connect the first switch and the second switch to the first busbar and the second busbar. Dividing the wiring components into two independent parts allows each component to independently connect the power transistor group to the capacitor busbar, avoiding mutual interference between power transistor groups located on the first and second mounting surfaces. The first wiring component includes a first busbar and a second busbar stacked together, used to connect the first switch and the first busbar. The first and second busbars have a flat and wide structure, which improves current carrying capacity. Their stacked arrangement further reduces stray inductance between the first switch and the first busbar. The first and second connecting portions on the first and second busbars are perpendicular to each other, adapting to the configuration where the first mounting surface and the first busbar are perpendicular, shortening the connection distance between the first switch and the first busbar, and reducing the commutation loop length between the first switch and the first busbar. The second wiring assembly includes a stacked third bus and a fourth bus, which are used to connect the second switch and the second busbar. The third and fourth buses have a flat and wide structure to improve current carrying capacity. Their stacked arrangement further reduces stray inductance between the second switch and the second busbar. The third and fourth connecting portions on the third and fourth buses are parallel to each other, adapting to a configuration where the second mounting surface and the second busbar are parallel. A bend connects the third and fourth connecting portions, ensuring the shortest possible connection distance between the second switch and the second busbar.

[0030] Technical solution ten provides a liquid-cooled converter that uses the aforementioned power components, which can improve the problems of large weight and high manufacturing cost of the power components in the original liquid-cooled converter. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the power component structure in the background technology;

[0033] Figure 2 The circuit diagram is shown in the background section, representing a three-level topology.

[0034] Figure 3 This is a schematic diagram of the power component involved in an embodiment of the present utility model;

[0035] Figure 4This is a three-dimensional structural schematic diagram of the power component involved in the embodiment of this utility model;

[0036] Figure 5 This is a side view of the power component involved in an embodiment of the present utility model;

[0037] Figure 6 for Figure 5 An enlarged schematic diagram of part A in the middle;

[0038] Figure 7 This is an exploded view of the capacitor busbar structure in the power component according to an embodiment of the present utility model;

[0039] Figure 8 This is an exploded view of the power component involved in an embodiment of the present utility model. Figure 1 ;

[0040] Figure 9 This is an exploded view of the power component involved in an embodiment of the present utility model. Figure 2 ;

[0041] Figure 10 This is a schematic diagram of the first wiring assembly in the power component according to an embodiment of the present utility model;

[0042] Figure 11 This is a schematic diagram of the second wiring assembly in the power component according to an embodiment of the present utility model;

[0043] Figure 12 This is a schematic diagram of the switching device in the power component according to an embodiment of the present utility model.

[0044] Explanation of key figure labels:

[0045] Capacitor module 10; DC capacitor cell 11; First capacitor cell 111; Second capacitor cell 112; Capacitor busbar 12; First busbar 121; Second busbar 122; First wiring section 123; Second wiring section 124; First region 125; Second region 126; First electrode plate 13; First output terminal 131; Neutral electrode plate 14; First plate 141; Second plate 142; Third wiring section 143; Fourth wiring section 144; Second electrode plate 15; Second output terminal 151; Bending and connecting section 152; Neutral wiring assembly 153; Second main plate 154; Output plate 155; Current-carrying section 16;

[0046] Power module 20; mounting base 21; first mounting surface 211; second mounting surface 212; power transistor assembly 22; switching device 221; switch terminal 2211; first switch 222; second switch 223; third switch 224; wiring component 23; first wiring assembly 231; first bus 2311; second bus 2312; first connection part 2313; second connection part 2314; second wiring assembly 232; third bus 2321; fourth bus 2322; third connection part 2323; fourth connection part 2324; bend 2325; connecting post 24; AC terminal block 25. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0048] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0049] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0050] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0051] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0052] Example

[0053] This utility model relates to a power component, as shown in the following embodiment. Figure 3 The power assembly mainly includes a capacitor module 10 and a power module 20. The capacitor module 10 mainly includes a DC capacitor bank 11 and a capacitor busbar 12, while the power module 20 mainly includes a mounting base 21, a power transistor group 22, and wiring components 23.

[0054] Reference Figure 3 The capacitor module 10 includes a DC capacitor bank 11 and a capacitor busbar 12; the DC capacitor bank 11 includes a first capacitor bank 111 and a second capacitor bank 112; the capacitor busbar 12 includes a neutral plate 14 and a first plate 13 and a second plate 15 stacked with the neutral plate 14, and has a first region 125 and a second region 126 that do not overlap or only partially overlap; the first plate 13 and the neutral plate 14 are stacked in the first region 125, and the first plate 13 and the neutral plate 14 are stacked in the second region 126; the first capacitor bank 111 is located in the first region 125 and connected to the first plate 13 and the neutral plate 14, and the first... Two capacitor banks 112 are disposed in the second region 126 and connected to the second electrode plate 15 and the neutral electrode plate 14; and a power module 20, which includes a power transistor group 22 and a wiring component 23; the power transistor group 22 includes a plurality of switching devices 221, some of which are connected to the capacitor busbar 12 through the wiring component 23; wherein, the switching device 221 connected to the first electrode plate 13 and the neutral electrode plate 14 at the first wiring portion 123 in the first region 125 is a first switch 222, and the switching device 221 connected to the second electrode plate 15 and the neutral electrode plate 14 at the second wiring portion 124 in the second region 126 is a second switch 223.

[0055] Reference Figure 3 In capacitor module 10, the DC capacitor bank 11 includes several electrolytic capacitors, which are further divided into two equal parts, serving as the first capacitor bank 111 and the second capacitor bank 112, respectively. The first capacitor bank 111 is... Figure 2 In the circuit topology shown, capacitor C1 and the second capacitor pool 112 are... Figure 2 The circuit topology shown includes capacitor C2. The number, arrangement, and connection of the capacitors to capacitor bus 12 are all conventional techniques in this field and will not be elaborated upon here.

[0056] The capacitor busbar 12 includes a first plate 13, a second plate 15, and a neutral plate 14. The first plate 13 and the second plate 15 have opposite polarities; in this embodiment, the first plate 13 is designated as the positive plate, and the second plate 15 as the negative plate. The neutral plate 14 is... Figure 2The NP in the circuit topology shown is used to cooperate to form a complete commutation loop.

[0057] The power transistor group 22 in the power module 20 includes several switching devices 221. These switching devices 221 are divided into a first switch 222, a second switch 223, and a third switch 224 connected to the AC terminal, according to their respective wiring objects. The first switch 222 and the second switch 223 are both connected to the capacitor busbar 12 through the wiring component 23. The first switch 222 and the second switch 223 correspond to Figure 2 In the circuit topology shown, the two switches connected to DC+ and DC-, and the third switch 224 corresponding to... Figure 2 The switch connected to AC in the circuit topology.

[0058] As a preferred embodiment, refer to Figure 3 The neutral electrode 14 is a plate-shaped component extending in a straight vertical direction. Based on the shape of the neutral electrode 14, a first region 125 is formed in its upper half, and a second region 126 is formed in its lower half. In this configuration, the first region 125 and the second region 126 do not overlap. The first electrode 13 and the neutral electrode 14 are partially stacked in the first region 125. A first wiring portion 123 is provided in the upper half of the first electrode 13 and the neutral electrode 14. The first switch 222 in the power module 20 is connected to this first wiring portion 123 through the wiring component 23. Correspondingly, the second electrode 15 and the neutral electrode 14 are partially stacked in the second region 126. A second wiring portion 124 is provided in the lower half of the second electrode 15 and the neutral electrode 14. The second switch 223 in the power module 20 is connected to this second wiring portion 124 through the wiring component 23. The first wiring portion 123 and the second wiring portion 124 are located in the first region 125 and the second region 126 of the capacitor busbar 12, respectively, and are arranged close to each other. Specifically, the first capacitor cell 111 is located on the upper part of the first region 125, and the second capacitor cell 112 is located on the lower part of the second region 126, thus forming a space between the first capacitor cell 111 and the second capacitor cell 112, and the aforementioned first wiring portion 123 and second wiring portion 124 are disposed in this space. The neutral plate 14 participates in both the positive and negative half-cycles of the commutation circuit. Therefore, the neutral plate 14 needs to be stacked with both the first plate 13 and the second plate 15 to reduce stray inductance. The first plate 13 and the second plate 15 only participate in commutation in their respective half-cycles. Therefore, on the capacitor busbar 12, the first plate 13 and the second plate 15 can be stacked independently and mainly with the neutral plate 14 in the first region 125 and the second region 126.

[0059] Furthermore, the neutral electrode 14 can be a single, continuous plate extending in the same plane, or it can be formed by two independent plates working together. For example, in the following embodiment, the neutral electrode 14 includes a first plate 141 stacked with the first electrode 13 and a second plate 142 stacked with the second electrode 15. The first plate 141 and the second plate 142 are independent of each other and connected by a neutral wiring assembly 153, and they respectively correspond to the first region 125 and the second region 126 mentioned above; the first electrode 13 and the first plate 141 work together to form a first busbar 121, and the second electrode 15 and the second plate 142 work together to form a second busbar 122. When the neutral electrode 14 is formed by two independent plates working together, their spatial positions can have various arrangements. One such arrangement can be referred to... Figure 3 In other words, two independent plates cooperate to form a plate-like component that extends in parallel or the same plane. In this case, the power module 20 can be located on one side of the neutral plate 14 in the front-back direction. Alternatively, the planes of the first busbar 121 and the second busbar 122 intersect; the power module 20 is located between the sides of the first busbar 121 and the second busbar 122 that are closer to each other.

[0060] Specifically, refer to Figure 4 and Figure 5 The capacitor busbar 12 is divided into a first busbar 121 and a second busbar 122. In this embodiment, the planes containing the first busbar 121 and the second busbar 122 are perpendicular to each other. Figure 4 Taking the direction shown as an example, the plane where the first busbar 121 is located is horizontal, and the plane where the second busbar 122 is located is vertical. The rear end of the first busbar 121 and the upper end of the second busbar 122 are connected as one unit, and the capacitor busbar 12 is roughly L-shaped. The first capacitor cell 111 is installed on the lower surface of the first busbar 121, and the second capacitor cell 112 is installed on the rear side of the second busbar 122. The power module 20 is located below the first busbar 121 and in front of the second busbar 122.

[0061] Alternatively, in another embodiment, the planes containing the first busbar 121 and the second busbar 122 are at an angle to each other, and this angle should be acute, meaning the first busbar 121 and the second busbar 122 are inclined towards each other. In this case, the power module 20 can be positioned between the first busbar 121 and the second busbar 122, with the power module 20 closer to the second busbar 122, to leave sufficient space for maintenance between the power module 20 and the first busbar 121.

[0062] In this embodiment, refer to Figure 5 and Figure 6The first busbar 121 includes a first plate 141 consisting of a first electrode plate 13 and a neutral electrode plate 14 stacked together. The second busbar 122 includes a second plate 142 consisting of a second electrode plate 15 and a neutral electrode plate 14 stacked together. The neutral connection assembly 153 may be a plurality of conductive terminals that connect the second plate 142 to the first plate 141. In this embodiment, the capacitor busbar 12 in the first busbar 121 is arranged from top to bottom as the first electrode plate 13 and the first plate 141, and in the second busbar 122 is arranged from front to back as the second electrode plate 15 and the second plate 142. The neutral plate 14 is divided into a first plate 13 and a second plate 15, wherein the first plate 13 is stacked with the first plate 13, and the second plate 15 is stacked with the second plate 15. The first plate 13 and the second plate 15 are independent of each other and are connected by the neutral wiring assembly 153. This arrangement allows the neutral plate 14 to form a stacked structure with the first plate 13 and the second plate 15 respectively. The relative positions of the first plate 13 and the second plate 15 can have a more flexible layout, which is beneficial to adapting to different power module 20 layouts. The overall manufacturing cost and installation difficulty of the neutral plate 14 are also reduced.

[0063] Furthermore, the second busbar 122 forms a bent butt portion 152 near the second wiring portion 124, which is bent relative to the plane of the second busbar 122. The plane of the bent butt portion 152 is parallel to the plane of the first busbar 121. The neutral wiring assembly 153 is connected to the bent butt portion 152. Specifically, refer to... Figure 6 and Figure 7 The upper parts of the second plate 142 and the second electrode plate 15 are both bent to form bent butt joints 152. The bent butt joints 152 are parallel to the plane containing the first busbar 121, thus facilitating the connection of the neutral wiring assembly 153 to the first plate 141 and the second plate 142. Furthermore, referring to… Figure 7 , Figure 8 and Figure 9At the connection point between the first plate 141 and the second plate 142, the first plate 141 has multiple connecting holes, and the corresponding number of connecting holes are also provided at the corresponding positions on the second plate 142. These connecting holes correspond one-to-one with each connecting post 24 in the neutral wiring assembly 153, thereby electrically connecting the first electrode plate 13 and the second electrode plate 15 into one unit. Specifically, the first electrode plate 13 has openings penetrating through it at positions corresponding to each terminal post, facilitating the fixing of the terminal posts from the side where the first electrode plate 13 is located. The second plate 142 and the second electrode plate 15 are provided with a bent connection portion 152. The bent connection portion 152 facilitates the connection of the second plate 142 to the first plate 141 and facilitates the setting of the second output terminal 151 of the second electrode plate 15. At the same time, while ensuring the normal installation of the power module 20, it brings the wiring positions of the second plate 142 and the first plate 141 as close as possible, and reduces the distance between the first wiring portion 123 and the second wiring portion 124, thereby shortening the commutation loop and reducing the stray inductance of the overall circuit. Furthermore, this bent connection design can more effectively utilize space, allowing for a more compact layout of the power components while maintaining good electrical performance.

[0064] Meanwhile, the bending direction of the bent connection portion 152 is towards the position on the first busbar 121 where the first capacitor bank 111 is located; the second electrode plate 15 includes a second main body plate 154 and an output plate 155; the bent connection portion 152 on the second electrode plate 15 is disposed on the second main body plate 154, and the output plate 155 is connected to the bent connection portion 152 on the second main body plate 154 through a second wiring assembly 232 and extends in a direction opposite to the bending direction of the bent connection portion 152 to form a second output terminal 151; the first electrode plate 13 extends in the same direction as the second output terminal 151 to form a first wiring terminal. Specifically, the bent connection portions 152 of the second electrode plate 15 and the second plate 142 are both bent forward, and the length of the second plate 142 extending forward after bending is greater than the length of the second electrode plate 15 extending forward after bending, so as to facilitate the connection of the second plate 142 to the first plate 141. Furthermore, the second electrode plate 15 is divided into an independent second main body plate 154 and an output plate 155. The bent joint portion 152 of the second electrode plate 15 is disposed on the second main body plate 154. The output plate 155 is connected to the bent joint portion 152 of the second main body plate 154 via a terminal post, so that the output plate 155 is positioned below the first plate 141 and forms a stacked arrangement with the first plate 141 and the first electrode plate 13. Referring to… Figure 7 , Figure 8 and Figure 9Through holes are also provided on the first plate 141 and the first electrode plate 13 at positions corresponding to the terminals connecting to the output plate 155, so as to fix the terminals connecting the second main plate 154 and the output plate 155 from the side where the first electrode plate 13 is located. The bending direction of the bent connecting part 152 is towards the position of the DC capacitor cell 11, which can further shorten the distance between the first connecting part 123 and the second connecting part 124 and reduce stray inductance; at the same time, the second electrode plate 15 is divided into the second main plate 154 and the output plate 155. The split design allows the special structure of the bent connecting part 152 and the second output terminal 151 having opposite directions to be realized. This structure can not only shorten the commutation circuit to reduce stray inductance, but also facilitate the external wiring of the power components and reduce current loss. Among them, refer to Figure 4 and Figure 7 The first output terminal 131 is located at the rear end of the first electrode plate 13, and the second output terminal 151 is located on the output plate 155 and at the rear end of the output plate 155. At the same time, the positions of the first output terminal 131 and the second output terminal 151 are offset in the left and right direction.

[0065] Furthermore, the neutral wiring assembly 153 is connected to the third wiring portion 143 on the first plate 141, and the second wiring assembly 232 is connected to the fourth wiring portion 144 on the output plate 155; the first electrode plate 13 and the first plate 141 are provided with a current-carrying portion 16 with a preset width, and the current-carrying portion 16 is located between the third wiring portion 143, the fourth wiring portion 144, the first output terminal 131, and the second output terminal 151; the output plate 155 is stacked with the first electrode plate 13 and the first plate 141. Specifically, the width of the current-carrying part 16 is the width of the first busbar 121 along the front-to-back direction. The current-carrying part 16 is disposed between the third terminal 143, the fourth terminal 144 and the first output terminal 131 and the second output terminal 151, thereby increasing the distance between the third terminal 143, the fourth terminal 144 and the first output terminal 131 and the second output terminal 151, thereby improving the current-carrying performance of the first electrode plate 13, the second electrode plate 15 and the first output terminal 131 and the second output terminal 151, and avoiding the decrease in current-carrying performance of the parts of the first electrode plate 13 and the second electrode plate 15 that are slightly away from the first output terminal 131 and the second output terminal 151 due to excessive distance.

[0066] Reference Figure 4In addition to the power transistor group 22 and the wiring component 23, the power module 20 also includes a mounting base 21. The mounting base 21 has a first mounting surface 211 and a second mounting surface 212 that are opposite to each other. The first mounting surface 211 is closer to the first electrode plate 13 than the second mounting surface 212, and the second mounting surface 212 is closer to the second electrode plate 15 than the first mounting surface 211. The first switch 222 is mounted on the first mounting surface 211, and the second switch 223 is mounted on the second mounting surface 212.

[0067] The term "close" as used herein refers to a state in which the mounting base 21 is positioned between the first busbar 121 and the second busbar 122. In this state, if it is necessary to bring the first mounting surface 211 abutting against the first busbar 121 or the second mounting surface 212 abutting against the second busbar 122, the mounting base 21 only needs to move or rotate toward the first busbar 121 or toward the second busbar 122.

[0068] Specifically, the mounting base 21 is a flat, plate-like component. In this embodiment, it serves as a liquid-cooled heat sink. Therefore, liquid-cooling pipes are also provided inside the mounting base 21. The mounting base 21 needs to be made of a thermally conductive metal material. When the power transistor assembly 22 is mounted onto the mounting base 21, the heat dissipation surface of the power transistor assembly 22 needs to be in close contact with the surface of the mounting base 21. (Refer to...) Figure 5 The front and rear surfaces of the mounting base 21 form a first mounting surface 211 and a second mounting surface 212, respectively. In this embodiment, the first mounting surface 211 of the mounting base 21 is perpendicular to the plane where the first busbar 121 is located, and the second mounting surface 212 is parallel to the plane where the second busbar 122 is located.

[0069] The power transistor group 22 includes three single-phase switch groups, each single-phase switch group includes four switch modules, and each switch module includes three switching devices 221. The four switch modules in each single-phase switch group are arranged in a left-right direction, and the three single-phase switch groups are also arranged in a left-right direction. (See reference...) Figure 8 and Figure 9 In this embodiment, 12 sets of switch modules are arranged along the left-right direction. The switch device 221 is an IGBT module, as shown in the reference diagram. Figure 12 Each switching device 221 includes four switching terminals 2211, which are used to connect to the capacitor busbar 12, other switching devices 221, or copper busbars connected to AC switches.

[0070] Reference Figure 5Each switch module comprises three switching devices 221, including a first switch 222 connected to the first busbar 121, a second switch 223 connected to the second busbar 122, and a third switch 224 connected to the third busbar. The first switch 222 is connected to the first electrode plate 13 and the neutral electrode plate 14 in the first busbar 121, and the second switch 223 is connected to the second electrode plate 15 and the neutral electrode plate 14 in the second busbar 122. In this embodiment, the first switch 222 is located on the first mounting surface 211 of the mounting base 21, the second switch 223 is located on the second mounting surface 212 of the mounting base, and the third switch 224 is also located on the first mounting surface 211 of the mounting base 21, but below the first switch 222. The first switch 222, the second switch 223, and the third switch 224 are connected by a copper busbar. A copper busbar, serving as a power output terminal, is provided below the third switch 224; this AC busbar 25 is used to output or receive three-phase power. In this embodiment, the outgoing terminals of the capacitor busbar 12 can be located at the rear end of the first busbar 121. Simultaneously, in each switch module, the three switching devices 221 each occupy a unit dimension equal to the width of one switching device 221 in the left-right direction, and the first switch 222 and the second switch 223 are symmetrically positioned relative to the mounting base 21. Corresponding to... Figure 2 In the circuit shown, the first switch 222 is Figure 2 Pipes 1 and 2 in the middle, the second switch 223 is Figure 2 Pipes 3 and 4 in the middle, the third switch 224 is Figure 2 Pipes 5 and 6 in the middle.

[0071] Reference Figure 8 The connection point between the first switch 222 in the power module 20 and the first busbar 121 in the capacitor module 10 is defined as the first connection part 2313, and the connection point between the second switch 223 and the second busbar 122 is defined as the second connection part 2314. In the structure where the first busbar 121 and the second busbar 122 are perpendicular to each other as shown in this embodiment, it can be seen that the first connection part 2313 and the second connection part 2314 are still in a close position to each other in the overall shape of the capacitor busbar 12. This arrangement shortens the length of the overall commutation circuit of the power component, thereby reducing stray inductance. Furthermore, the first output terminal 131 and the second output terminal 151 are located at the rear end of the first busbar 121, between the first connection part 2313 and the second connection part 2314 in the overall layout of the capacitor busbar 12, so that the first output terminal 131 and the second output terminal 151 can be set close to the first connection part 2313 and the second connection part 2314.

[0072] Furthermore, the DC capacitor pool 11 and capacitor busbar 12 in the capacitor module 10 are each divided into two independent parts, namely the first capacitor pool 111 and the second capacitor pool 112, and the first busbar 121 and the second busbar 122, respectively. The first busbar 121 and the second busbar 122 are positioned at a certain angle to each other or are parallel to each other. At the same time, the first mounting surface 211 of the mounting base 21 in the power module 20 is positioned close to the first busbar 121, and the second mounting surface 212 is positioned close to the second busbar 122. The power transistor group 22 is divided into a first switch 222 and a second switch 223, which are respectively arranged on the first mounting surface 211 and the second mounting surface 212. The first switch 222 is then connected to the second mounting surface 212 via the wiring component 23. 22 is connected to the first busbar 121, and the second switch 223 is connected to the second busbar 122. Compared with the existing technology of setting a complete capacitor busbar 12, the power component provided by this technical solution splits the capacitor busbar 12 into two independent parts. These two independent parts can more freely adjust their positions relative to the power transistor group 22. The positional relationship and connection distance between the first switch 222, the second switch 223 and the capacitor busbar 12 will not be affected by each other. They can be decoupled and connected to the first busbar 121 and the second busbar 122 respectively. The commutation loop length formed between the power transistor group 22 and the capacitor busbar 12 is shorter, thereby reducing the overall stray inductance.

[0073] As another aspect of the power component according to this utility model embodiment, the wiring component 23 includes a first wiring component 231 and a second wiring component 232; the first wiring component 231 connects each of the first switches 222 and the first busbar 121; the second wiring component 232 connects each of the second switches 223 and the second busbar 122. The first wiring component 231 includes a first busbar 2311 and a second busbar 2312 arranged in a stacked configuration; each of the first switches 222 is arranged along a first direction on the first mounting surface 211; both the first busbar 2311 and the second busbar 2312 extend along the first direction and are connected to each of the first switches 222. The second wiring component 232 includes a third busbar 2321 and a fourth busbar 2322 arranged in a stacked configuration; each of the second switches 223 is arranged along the first direction on the second mounting surface 212; both the third busbar 2321 and the fourth busbar 2322 extend along the first direction and are connected to each of the second switches 223. The first wiring assembly 231 includes a first busbar 2311 and a second busbar 2312 stacked together, which are used to connect the first switch 222 and the first busbar 121. The first busbar 2311 and the second busbar 2312 have a flat and wide structure, which can improve the current carrying capacity. At the same time, the stacked arrangement of the two can further reduce the stray inductance between the first switch 222 and the first busbar 121. The second wiring assembly 232 includes a third busbar 2321 and a fourth busbar 2322 stacked together, which are used to connect the second switch 223 and the second busbar 122. The third busbar 2321 and the fourth busbar 2322 have a flat and wide structure, which can improve the current carrying capacity. At the same time, the stacked arrangement of the two can further reduce the stray inductance between the second switch 223 and the second busbar 122.

[0074] Among them, reference Figure 6 , Figure 10 and Figure 11The first busbar 2311 and the second busbar 2312 each have a first connecting portion 2313 and a second connecting portion 2314. The first connecting portion 2313 connects to each of the first switches 222, and its plane is parallel to the first mounting surface 211. The second connecting portion 2314 connects to the first busbar 121, and its plane is perpendicular to the first mounting surface 211. The third busbar 2321 and the fourth busbar 2322 each have a third connecting portion 2323, a fourth connecting portion 2324, and a turning portion 2325. The third connecting portion 2323 connects to each of the second switches 223, and its plane is parallel to the second mounting surface 212. The fourth connecting portion 2324 connects to the second busbar 122, and its plane is parallel to the second mounting surface 212. The turning portion 2325 connects the third connecting portion 2323 and the fourth connecting portion 2324, and its plane is perpendicular to the second mounting surface 212. The first connecting portion 2313 and the second connecting portion 2314 on the first bus 2311 and the second bus 2312 are perpendicular to each other, adapting to the configuration where the first mounting surface 211 and the first busbar 121 are perpendicular to each other. This shortens the connection distance between the first switch 222 and the first busbar 121, reduces the commutation circuit length between the first switch 222 and the first busbar 121, and reduces stray inductance. The third connecting portion 2323 and the fourth connecting portion 2324 on the third bus 2321 and the fourth bus 2322 are parallel to each other, adapting to the configuration where the second mounting surface 212 and the second busbar 122 are parallel to each other. At the same time, the third connecting portion 2323 and the fourth connecting portion 2324 are connected by the turning portion 2325, ensuring that the second switch 223 and the second busbar 122 have the shortest connection distance, and reducing stray inductance.

[0075] Specifically, refer to Figure 6 To connect each first switch 222 to the first busbar 121 and each second switch 223 to the second busbar 122 respectively, the wiring component 23 is divided into two independent first wiring assemblies 231 and second wiring assemblies 232. In the first wiring assembly 231, the first busbar 2311 and the second busbar 2312 are respectively connected to the first switch terminal 2211 and the second switch terminal 2211 of each first switch 222, and then respectively connected to the first electrode plate 13 and the neutral electrode plate 14 in the first busbar 121. In the second wiring assembly 232, the third busbar 2321 and the fourth busbar 2322 are respectively connected to the first switch terminal 2211 and the second switch terminal 2211 of each second switch 223, and then respectively connected to the second electrode plate 15 and the neutral electrode plate 14 in the second busbar 122. To further reduce stray inductance generated in the converter circuit, the first bus 2311 and the second bus 2312 are stacked copper busbars, and the third bus 2321 and the fourth bus 2322 are also stacked copper busbars, with an insulating layer between adjacent busbars.

[0076] To accommodate the spatial relationship between the first busbar 121, the second busbar 122, and the mounting base 21, the busbars in the first wiring assembly 231 and the second wiring assembly 232 have their own unique shapes and structures. In the first wiring assembly 231, both the first busbar 2311 and the second busbar 2312 are elongated strips extending in the left-right direction. Each of the first busbar 2311 and the second busbar 2312 has a first connecting portion 2313 extending in the up-down direction and a second connecting portion 2314 extending in the front-back direction. There are gaps between the first connecting portions 2313 and between the second connecting portions 2314. The gaps between the first connecting portions 2313 in the first busbar 2311 correspond exactly to the positions of the first connecting portions 2313 in the second busbar 2312, and the gaps between the second connecting portions 2314 in the first busbar 2311 correspond exactly to the positions of the second connecting portions 2314 in the second busbar 2312. With this configuration, when the first busbar 2311 and the second busbar 2312 are stacked together, the connection portion of one busbar corresponds to the spacing of the other. This is because the two switch terminals 2211 on each of the first switches 222 are on the same plane, while the plates on the first busbar 121 are arranged in a stacked manner. Only by staggering the first busbar 2311 and the second busbar 2312 can the connections between the first busbar 2311 and the second busbar 2312 and the first switches 222 and the first busbar 121 be prevented from interfering with each other. In order to eliminate the influence of the height difference between the first busbar 2311 and the second busbar 2312 on the wiring, a conductive connecting post 24 is also provided. The connecting post 24 can be used to connect the first connecting portion 2313 and the second connecting portion 2314 of the first busbar 2311 and the second busbar 2312 to the switch terminal 2211 of the first switch 222 and the plate of the first busbar 121.

[0077] In the second wiring assembly 232, both the third busbar 2321 and the fourth busbar 2322 are elongated strip-shaped components extending in the left-right direction. Each of the third busbar 2321 and the fourth busbar 2322 has a third connecting portion 2323 and a fourth connecting portion 2324 extending in the up-down direction, and a turning portion 2325 extending in the front-back direction. The third connecting portions 2323 are spaced apart, and the fourth connecting portions 2324 are also spaced apart. The spacing between each third connecting portion 2323 in the third busbar 2321 corresponds exactly to the position of each third connecting portion 2323 in the fourth busbar 2322, and the spacing between each fourth connecting portion 2324 in the third busbar 2321 corresponds exactly to the position of each fourth connecting portion 2324 in the third busbar 2321. The turning portion 2325 serves to connect the third connecting portions 2323 and the fourth connecting portions 2324, and can be considered as a complete strip. With this configuration, when the third busbar 2321 and the fourth busbar 2322 are stacked together, the connection portion of one busbar will correspond to the spacing of the other. This is because the two switch terminals 2211 on each of the second switches 223 are on the same plane, while the plates on the second busbar are arranged in a stacked manner. Only by staggering the third busbar 2321 and the fourth busbar 2322 can the connections between the third busbar 2321 and the fourth busbar 2322 and the second switches 223 and the second busbar 122 be prevented from interfering with each other. In order to eliminate the influence of the height difference between the third busbar 2321 and the fourth busbar 2322 on the wiring, a conductive connecting post 24 is also provided. The connecting post 24 can be used to connect the third connecting portion 2323 and the fourth connecting portion 2324 of the third busbar 2321 and the fourth busbar 2322 to the switch terminal 2211 of the second switch 223 and the plate of the second busbar 122.

[0078] The power components involved in this embodiment include a capacitor module 10 and a power module 20. The capacitor module 10 includes a DC capacitor bank 11 and a capacitor busbar 12. The capacitor busbar 12 includes a first electrode 13, a second electrode 15, and a neutral electrode 14, which are stacked together. The capacitor busbar 12 also has a first region 125 and a second region 126, which do not overlap or only partially overlap. The first electrode 13 and the neutral electrode 14 are stacked in the first region 125, and the second electrode 15 and the neutral electrode 14 are stacked in the second region 126. The second region 126 is stacked; the power module 20 includes a power transistor group 22 and a wiring component 23. Some of the switching devices 221 in the power transistor group 22 are connected to the capacitor busbar 12 through the wiring component 23. Since the first electrode plate 13 and the second electrode plate 15 are stacked on the first region 125 and the second region 126 of the neutral electrode plate 14 respectively, the amount of material used for the first electrode plate 13 and the second electrode plate 15 is reduced, thereby reducing the overall weight of the capacitor busbar 12. The reduction in material usage also reduces the manufacturing cost. The lighter weight has a positive impact on the installation and transportation of the power component. Furthermore, the switching device 221 connected to the capacitor busbar 12 is further divided into a first switch 222 and a second switch 223. The first switch 222 is only connected to the first wiring portion 123 of the first electrode plate 13 and the neutral electrode plate 14, and the second switch 223 is only connected to the second electrode plate 15 and the second wiring portion 124 of the neutral electrode plate 14. Since the connection between the switching device 221 and the capacitor busbar 12 requires opening holes in the capacitor busbar 12, and since the first electrode plate 13 and the second electrode plate 15 in this technical solution are only in the first region 125 and the second region 124, Since the first plate 13 and the second plate 15 are stacked on top of the neutral plate 14, the capacitor busbar 12 in this technical solution has fewer openings on its plates compared to the structure where the first plate 13 and the second plate 15 are stacked on the entire neutral plate 14. Fewer openings effectively improve the current-carrying efficiency of each plate. The improved current-carrying efficiency allows each plate to achieve the same current-carrying performance in a smaller current-carrying area. Therefore, the thickness of each plate can be set thinner, thereby further reducing the amount of material used and improving the problems of heavy weight and high manufacturing cost. Furthermore, since the first plate 13 and the second plate 15 no longer have stacked parts or only have a small number of stacked parts, the electromagnetic coupling between the first plate 13 and the second plate 15 is improved, thereby reducing mutual interference between different plates and improving the anti-interference capability of the system.

[0079] Furthermore, this utility model embodiment also relates to a liquid-cooled converter, which includes a converter cabinet in which the power components described above are installed, and the power components are cooled by liquid cooling. Specifically, the mounting base 21 is a liquid-cooled heat sink to achieve liquid cooling of the power components.

[0080] Specifically, the liquid-cooled converter may further include a liquid-cooled unit, with the mounting base 21 serving as a liquid-cooled heat sink. The mounting base 21 has multiple liquid-cooled channels with flowing coolant inside. The mounting base 21 is also connected to the liquid-cooled unit through liquid-cooled pipes. The coolant can circulate between the liquid-cooled unit and the mounting base 21 through the liquid-cooled pipes, dissipating heat at the location of the liquid-cooled unit to cool down and absorbing heat at the location of the mounting base 21 to heat up. Thus, the cooling and heat dissipation of the power transistor group 22 in the power component is achieved through the circulation of the coolant.

[0081] Meanwhile, since the liquid-cooled converter uses the aforementioned power components, it can improve the problems of large weight and high manufacturing cost of the power components in the original liquid-cooled converter.

[0082] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A power component, characterized in that it comprises: A capacitor module (10) includes a DC capacitor bank (11) and a capacitor busbar (12); the DC capacitor bank (11) includes a first capacitor bank (111) and a second capacitor bank (112); the capacitor busbar (12) includes a neutral plate (14) and a first plate (13) and a second plate (15) stacked with the neutral plate (14), and has a first region (125) and a second region (126) that do not overlap or only partially overlap; the first plate (13) and the neutral plate (14) are stacked in the first region (125), and the first plate (13) and the neutral plate (14) are stacked in the second region (126); the first capacitor bank (111) is located in the first region (125) and connected to the first plate (13) and the neutral plate (14); the second capacitor bank (112) is located in the second region (126) and connected to the second plate (15) and the neutral plate (14); and A power module (20) includes a power transistor group (22) and a wiring component (23); the power transistor group (22) includes a plurality of switching devices (221), some of which are connected to the capacitor busbar (12) through the wiring component (23); wherein, the switching device (221) connected to the first electrode plate (13) and the neutral electrode plate (14) at the first wiring portion (123) in the first region (125) is a first switch (222), and the switching device (221) connected to the second electrode plate (15) and the neutral electrode plate (14) at the second wiring portion (124) in the second region (126) is a second switch (223).

2. A power component as described in claim 1, characterized in that, The neutral plate (14) includes a first plate (141) stacked with the first plate (13) and a second plate (142) stacked with the second plate (15). The first plate (141) and the second plate (142) are independent of each other and connected by a neutral wiring assembly (153), and they correspond to the first region (125) and the second region (126) mentioned above, respectively. The first plate (13) and the first plate (141) cooperate to form a first busbar (121), and the second plate (15) and the second plate (142) cooperate to form a second busbar (122).

3. A power component as described in claim 2, characterized in that, The planes on which the first busbar (121) and the second busbar (122) are located intersect; the power module (20) is located between the sides of the first busbar (121) and the second busbar (122) that are closer to each other.

4. A power component as described in claim 3, characterized in that, The second busbar (122) forms a bent docking portion (152) near the second wiring portion (124) that is bent relative to the plane of the second busbar (122), and the plane of the bent docking portion (152) is parallel to the plane of the first busbar (121); the neutral wiring assembly (153) is connected to the bent docking portion (152).

5. A power component as described in claim 4, characterized in that, The bending direction of the bent connection part (152) is toward the position on the first busbar (121) where the first capacitor bank (111) is located; the second electrode plate (15) includes a second main plate (154) and an output plate (155); the bent connection part (152) on the second electrode plate (15) is located on the second main plate (154), and the output plate (155) is connected to the bent connection part (152) on the second main plate (154) through a second wiring assembly (232) and extends in the opposite direction to the bending direction of the bent connection part (152) to form a second output terminal (151); the first electrode plate (13) extends in the same direction as the second output terminal (151) to form a first wiring terminal.

6. A power component as described in claim 5, characterized in that, The neutral wiring assembly (153) is connected to the third wiring part (143) on the first plate (141), and the second wiring assembly (232) is connected to the fourth wiring part (144) on the output plate (155). The third wiring part (143) and the fourth wiring part (144) are both located in the second region (126). The first busbar (121) is provided with a current-carrying part (16) with a preset width in a preset direction. The current-carrying part (16) is located between the third wiring part (143), the fourth wiring part (144), the first output terminal (131), and the second output terminal (151) in the preset direction. The output plate (155) is stacked with the first busbar (121).

7. A power component as described in claim 6, characterized in that, The power module (20) includes a mounting base (21), which has a first mounting surface (211) and a second mounting surface (212) facing away from each other. The first switch (222) is mounted on the first mounting surface (211), and the second switch (223) is mounted on the second mounting surface (212). The mounting base (21) is located between the first electrode plate (13) and the second electrode plate (15), and the first mounting surface (211) is closer to the first electrode plate (13) relative to the second mounting surface (212), and the second mounting surface (212) is closer to the second electrode plate (15) relative to the first mounting surface (211). When the planes where the first electrode plate (13) and the second electrode plate (15) are respectively perpendicular, the first mounting surface (211) is perpendicular to the plane where the first electrode plate (13) is located, and the second mounting surface (212) is parallel to the plane where the second electrode plate (15) is located.

8. A power component as described in claim 7, characterized in that, The first busbar (121) is arranged in layers from far to near the first mounting surface (211) as the first pole plate (13) and the first plate (141), and the second busbar (122) is arranged in layers from far to near the second mounting surface (212) as the second plate (142) and the second pole plate (15).

9. A power component as described in claim 8, characterized in that, The wiring component (23) includes a first wiring assembly (231) and a second wiring assembly (232); the first wiring assembly (231) includes a first busbar (2311) and a second busbar (2312) arranged in layers; each of the first switches (222) is arranged along a first direction on a first mounting surface (211); the first busbar (2311) and the second busbar (2312) both extend along the first direction and are connected to each of the first switches (222); the first busbar (2311) and the second busbar (2312) each have a first connecting portion (2313) and a second connecting portion (2314); the first connecting portion (2313) connects each of the first switches (222), and its plane is parallel to the first mounting surface (211); the second connecting portion (2314) connects the first busbar (121), and its plane is perpendicular to the first mounting surface (211); the second wiring assembly (232) includes layers A third busbar (2321) and a fourth busbar (2322) are stacked; each second switch (223) is arranged along a first direction on a second mounting surface (212); both the third busbar (2321) and the fourth busbar (2322) extend along the first direction and are connected to each of the second switches (223); both the third busbar (2321) and the fourth busbar (2322) have a third connecting part (2323), a fourth connecting part (2324), and... The turning part (2325) connects each of the second switches (223), and its plane is parallel to the second mounting surface (212); the fourth connecting part (2324) connects the second busbar (122), and its plane is parallel to the second mounting surface (212); the turning part (2325) connects the third connecting part (2323) and the fourth connecting part (2324), and its plane is perpendicular to the second mounting surface (212).

10. A liquid-cooled converter, comprising a converter cabinet, characterized in that, The converter cabinet is equipped with a power component as described in any one of claims 7-9; the mounting base (21) is a liquid-cooled heat sink.

Images