A power assembly and liquid cooled converter

Abstract

The application discloses a power assembly and a liquid-cooled converter, the power assembly comprising a capacitor module, a power module and a radiator; the capacitor module comprises DC capacitor banks and a capacitor busbar connected with each other; the power module comprises an input busbar, an output busbar and three single-phase switch tube groups, each single-phase switch tube group comprising a plurality of switch modules and being connected to the input busbar and the output busbar; the input busbar is connected to the connecting part; the output busbar is used for outputting electric energy; and all single-phase switch tube groups in the power module are mounted on the radiator, and the arrangement direction of each switch module in each single-phase switch tube group is parallel to the connecting part. The power assembly can solve the problem of large volume of the existing power assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power equipment, in particular to a power assembly and a liquid-cooled converter. BACKGROUND

[0002] The converter is widely used in the fields of power system, rail transit, military industry, oil machinery, new energy vehicle, wind power generation, solar photovoltaic, etc. It is connected between the battery system and the power grid, and is used for realizing bidirectional conversion of electric energy, controlling the charging and discharging process of the battery, converting AC and DC, and directly supplying power to AC load in the case of no power grid. At the same time, the NPC (Neutral Point Clamp) or ANPC (Active Neutral Point Clamp) three-level topology can use low blocking voltage IGBT devices to increase the DC bus voltage, thereby improving the AC output voltage and expanding the system power level, so it is widely used in the converter.

[0003] As shown in Figure 1 , it shows the structure of the power assembly of the three-level topology in the conventional converter, which mainly includes a capacitor busbar 01, a DC capacitor bank 02, an input busbar 03, a switching tube 04, an output busbar 05, a heat sink 06 and a connecting busbar 07.

[0004] Among them, the capacitor busbar 01 and the DC capacitor bank 02 cooperate to form a capacitor module, the capacitor busbar 01 includes a positive plate, a neutral plate and a negative plate, and according to the circuit structure of the three-level topology, each capacitor device in the DC capacitor bank 02 is connected with the plate of different polarity on the capacitor busbar 01.

[0005] Since the output of the power assembly is three-phase alternating current, it includes three groups of single-phase switching tube groups, each group of single-phase switching tube group includes a plurality of switching modules, a heat sink 06, a group of input busbars 03, a group of connecting busbars 07 and an output busbar 05. Among them, the heat sink 06 is a air-cooled heat sink, one side of which forms a mounting surface for mounting the switching tube 04, and the other side away from the mounting surface is provided with a heat dissipation fin.

[0006] Continuing to refer to Figure 2Each switch module includes three switch tubes 04, the upper two are input tubes 04a and the lower one is an output tube 04b, the two input tubes 04a and the input tube 04a and the output tube 04b are connected by a connection row 07, and the switch modules are connected in parallel. Parallel connection can improve the output current capacity of the single three-level topology bridge arm, and the power assembly adopts a structure of four switch modules in parallel. A set of input rows 03 is provided with a positive plate, a neutral plate and a negative plate corresponding to the capacitor bus 01, which are respectively connected to the corresponding plates on the capacitor bus 01. The output row 05 is connected to the output end of the four switch modules to provide a single-phase alternating current output, and the output rows 05 of the three sets of switch modules collectively provide a three-phase alternating current output.

[0007] With reference to the accompanying drawings Figure 3a And Figure 3b Take a set of switch modules as an example, Figure 3a is a circuit schematic diagram of the three-level topology, Figure 3b is a connection schematic diagram of the actual switch tube 04. In a switch module, two input tubes 04a and one output tube 04b are included, the terminals of the two input tubes 04a connected to the input row 03 respectively include a positive terminal 041, a first neutral terminal 042, a second neutral terminal 043 and a negative terminal 044, the positive terminal 041 is connected to the positive plate of the input row 03, the first neutral terminal 042 and the second neutral terminal 043 are connected to the neutral plate of the input row 03, and the negative terminal 044 is connected to the negative plate of the input row 03. The lower end terminals of the two input tubes 04a are connected respectively and then connected to the output tube 04b below through the connection row 07, the output tube 04b has a first output terminal 045 and a second output terminal 046 at the lower end, both of which are connected to the output row 05. Among them, the input tube 04a can include Figure 3a T1, D1, T2, D2; the input tube 04b can include Figure 3a T3, D3, T4, D4; the output tube can include Figure 3a T5, D5, T6, D6.

[0008] In a switch module, the corresponding terminals of the input tube 04a form the input end of the switch module, and the corresponding terminals of the output tube 04b form the output end of the switch module. In a single-phase switch module, the input ends of the switch modules form the input end of the single-phase switch module, and the output ends of the switch modules form the output end of the single-phase switch module.

[0009] Obviously, the power assembly of this kind of structure has the following problems: the power assembly has a large volume, so that the corresponding converter cannot be applied to small or special electrical cabinets; and the power assembly reduces the stray inductance generated during commutation by using a large number of copper stack layers, resulting in a high manufacturing cost of the power assembly. SUMMARY

[0010] The present application aims to overcome at least one of the defects or problems in the background art, and provide a power assembly and a liquid-cooled converter.

[0011] The present application and its related embodiments adopt the following technical solutions but are not limited to the following solutions:

[0012] The first technical solution and its related embodiments relate to a power assembly, which comprises: a capacitor module comprising DC capacitor cells and a capacitor busbar connected to each other; the capacitor busbar has a connection part; a power module comprising an input busbar, an output busbar and three single-phase switch tube groups; each single-phase switch tube group comprises a plurality of switch modules and is connected to the input busbar and the output busbar; the input busbar is connected to the connection part; the output busbar is used for outputting electric energy; and further comprising: a heat sink; all single-phase switch tube groups in the power module are mounted on the heat sink, and the arrangement direction of each switch module in each single-phase switch tube group is parallel to the connection part.

[0013] The second technical solution is based on the first technical solution and is a preferred embodiment of the first technical solution, wherein the surface of the heat sink for mounting each single-phase switch tube group forms a mounting surface, and the mounting surface is parallel to the connection part.

[0014] The third technical solution is based on the second technical solution and is a preferred embodiment of the second technical solution, wherein all single-phase switch tube groups are mounted on the same mounting surface of the heat sink, and the mounting surface faces away from the connection part relative to the heat sink.

[0015] The fourth technical solution is based on the third technical solution and is a preferred embodiment of the third technical solution, wherein each switch module in all single-phase switch tube groups is divided into two parts arranged on the upper and lower parts of the mounting surface, each switch module in each part is arranged side by side in the left-right direction, and the input ends of the switch modules of the two parts face away from each other.

[0016] The fifth technical solution is based on the fourth technical solution, which is a preferred embodiment of the fourth technical solution. The three single-phase switch tube groups are respectively the first phase, the second phase, and the third phase. The first phase and the second phase are arranged on the upper and lower parts of the mounting surface, and the output ends of the two are oppositely arranged and located in the middle part of the mounting surface, and the output ends of the two are respectively connected to an output row. The third phase is divided into a third phase first part and a third phase second part according to the number of included switch modules, and the two are arranged on the upper and lower parts of the mounting surface, and the output ends of the two are located in the middle part of the mounting surface and connected to the same output row.

[0017] The sixth technical solution is based on the second technical solution, which is a preferred embodiment of the second technical solution. The heat sink has two mounting surfaces facing away from each other, one of which faces the connection part, and the other of which faces away from the connection part. All single-phase switch tube groups are divided into two parts and installed on the two mounting surfaces of the heat sink.

[0018] The seventh technical solution is based on the sixth technical solution, which is a preferred embodiment of the sixth technical solution. Each of the switch modules includes three switch tubes, and the switch tubes are divided into input tubes and output tubes according to types. The input tubes and output tubes of each switch module in each single-phase switch tube group are correspondingly arranged side by side in the left-right direction.

[0019] The eighth technical solution is based on the seventh technical solution, which is a preferred embodiment of the seventh technical solution. The three single-phase switch tube groups are respectively the first phase, the second phase, and the third phase. The first phase and the second phase are respectively installed on the upper parts of the two mounting surfaces. The third phase is divided into a third phase first part and a third phase second part according to the types of switch tubes included, and the third phase first part and the third phase second part are respectively installed on the lower parts of the two mounting surfaces. The input ends of the first phase and the second phase are arranged upward, and the output ends of the two are arranged downward. The input ends and the output ends of the third phase are both arranged downward.

[0020] The ninth technical solution is based on the seventh technical solution, which is a preferred embodiment of the seventh technical solution. The three single-phase switch tube groups are respectively the first phase, the second phase, and the third phase. The first phase, the second phase, and the third phase are sequentially distributed in the up-down direction and divided into a first phase first part, a first phase second part, a second phase first part, a second phase second part, a third phase first part, and a third phase second part according to the types of switches included. The first phase first part, the second phase first part, and the third phase first part include input tubes in the corresponding single-phase switch tube groups, and the three are located on the side mounting surface of the heat sink facing the capacitor busbar. The first phase second part, the second phase second part, and the third phase second part include output tubes in the corresponding single-phase switch tube groups, and the three are located on the side mounting surface of the heat sink facing away from the capacitor busbar.

[0021] The tenth technical solution and the related embodiments thereof relate to a liquid-cooled converter, which comprises the power assembly according to any one of the first to ninth technical solutions, and the heat sink (10) adopted is a liquid-cooled heat sink.

[0022] From the above description of the present application and its specific embodiments, it can be seen that, compared with the prior art, the technical solution of the present application and the related embodiments thereof have the following beneficial effects due to the adoption of the following technical means:

[0023] The inventor has found through continuous observation, experiment and research that, in the prior art, the reason for causing the technical problem of "large volume of power assembly" is that the three groups of single-phase switching tubes are arranged on three heat sinks, the heat sinks occupy most of the volume of the power assembly, and a certain distance needs to be left between the three heat sinks, thus increasing the overall volume of the power assembly.

[0024] To this end, in the first technical solution and the related embodiments, the three groups of single-phase switching tubes are arranged on one heat sink, the heat sink is used to dissipate heat for all the switching tubes, the number of heat sinks in the power assembly is reduced, thus reducing the overall volume of the power assembly and further reducing the overall volume of the converter device. Moreover, arranging the three groups of single-phase switching tubes on one heat sink can reduce the overall manufacturing cost of the power assembly and also facilitate the maintenance of the power assembly; in addition, the input ends and output ends of the three groups of single-phase switching tubes can be rearranged in a more concentrated position, thus facilitating the internal and external wiring of the input row and the output row; at the same time, the arrangement direction of each switching module in each group of single-phase switching tubes is parallel to the connection part of the capacitor busbar, the distance between each switching module and the capacitor busbar is consistent in each group of single-phase switching tubes, which can improve the uniformity of the current loop and reduce the stray inductance of the power assembly.

[0025] In the second technical solution and the related embodiments, the mounting surface of the heat sink is parallel to the connection part of the capacitor busbar, the heat sink and the capacitor busbar form a laminated arrangement, the size of the power assembly is related to the thickness of the heat sink and the capacitor module, and the length or width of the heat sink has less impact on the size of the power assembly.

[0026] In the third technical solution and the related embodiments, the three groups of single-phase switching tubes are arranged on the same mounting surface of the heat sink away from the connection part of the capacitor busbar, which facilitates the installation and maintenance of the single-phase switching tube groups.

[0027] In the fourth, fifth and related embodiments, the arrangement of the three single-phase switch tube groups is adjusted, which can facilitate the input and output wiring of the three single-phase switch tube groups, and can also reduce the area occupied by the single-phase switch tube groups on the heat sink and the volume of the heat sink; at the same time, the length of the current loop between each single-phase switch tube group and the capacitor bus is consistent, which can improve the current loop balance and further reduce the generation of stray inductance by shortening the commutation loop.

[0028] In the sixth and related embodiments, the three single-phase switch tube groups are divided into two parts and installed on two mounting surfaces of the heat sink, which can further reduce the volume of the heat sink, further improve the space utilization of the heat sink, and reduce the overall volume of the power assembly.

[0029] In the seventh and related embodiments, the input tubes and output tubes of each switch module in each single-phase switch tube group are arranged in parallel along the left-right direction, which can ensure that the input end of each switch module in each single-phase switch tube group can be connected to the connection part of the same input row and the capacitor bus, improving the balance of the current loop; at the same time, the output end of each switch module can be connected to the same output row, facilitating wiring.

[0030] In the eighth and related embodiments, the arrangement of the three single-phase switch tube groups is set, which can achieve the goal of double-sided arrangement without affecting the input and output wiring of each single-phase switch tube group, and can improve the balance of the current loop and reduce the generation of stray inductance.

[0031] In the ninth and related embodiments, another arrangement of the three single-phase switch tube groups is adopted, which can achieve the goal of double-sided arrangement to reduce the volume of the heat sink without affecting the input and output wiring of each single-phase switch tube group, and can reduce the generation of stray inductance.

[0032] In the tenth and related embodiments, a liquid-cooled converter is provided, which adopts a liquid-cooled heat sink, and has the above technical effects according to the power assembly adopted. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings needed in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0034] Figure 1 Structure diagram of the existing converter power assembly mentioned in the background Figure 1;

[0035] Figure 2 Structure diagram of the existing converter power assembly mentioned in the background art Figure 2 ;

[0036] Figure 3a Circuit topology diagram of the existing converter power assembly mentioned in the background art

[0037] Figure 3b Structure diagram 3 of the existing converter power assembly mentioned in the background art

[0038] Figure 4a Structure diagram of embodiment 1 of the present application Figure 1 ;

[0039] Figure 4b Structure diagram of embodiment 1 of the present application Figure 2 ;

[0040] Figure 5a Structure diagram of embodiment 2 of the present application Figure 1 ;

[0041] Figure 5b Structure diagram of embodiment 2 of the present application Figure 2 ;

[0042] Figure 6a Structure diagram of embodiment 3 of the present application Figure 1 ;

[0043] Figure 6b Structure diagram of embodiment 3 of the present application Figure 2 ;

[0044] Figure 7a Structure diagram of embodiment 4 of the present application Figure 1 ;

[0045] Figure 7b Structure diagram of embodiment 4 of the present application Figure 2 ;

[0046] Figure 8a Structure diagram of embodiment 5 of the present application Figure 1 ;

[0047] Figure 8b Structure diagram of embodiment 5 of the present application Figure 2 ;

[0048] Figure 9a Structure diagram of embodiment 6 of the present application Figure 1 ;

[0049] Figure 9b Structure diagram of embodiment 6 of the present applicationFigure 2 ;

[0050] Figure 10a Structure diagram of embodiment 7 of the present application Figure 1 ;

[0051] Figure 10b Structure diagram of embodiment 7 of the present application Figure 2 ;

[0052] Figure 11a Structure diagram of embodiment 8 of the present application Figure 1 ;

[0053] Figure 11b Structure diagram of embodiment 8 of the present application Figure 2 ;

[0054] Figure 12a Structure diagram of embodiment 9 of the present application Figure 1 ;

[0055] Figure 12b Structure diagram of embodiment 9 of the present application Figure 2 ;

[0056] Figure 13a Structure diagram of embodiment 10 of the present application Figure 1 ;

[0057] Figure 13b Structure diagram of embodiment 10 of the present application Figure 2 ;

[0058] Figure 14 Structure diagram of embodiment 11 of the present application Figure 1 ;

[0059] Figure 15 Structure diagram of embodiment 11 of the present application Figure 2 ;

[0060] Figure 16 Structure diagram of embodiment 11 of the present application

[0061] Figure 17 Structure diagram of embodiment 12 of the present application Figure 15 ;

[0062] Figure 18a Structure diagram of embodiment 12 of the present application Figure 1 ;

[0063] Figure 18b Structure diagram of embodiment 12 of the present application Figure 2 ;

[0064] Figure 19 Structure diagram of embodiment 13 of the present application

[0065] Explanation of reference numerals:

[0066] In the accompanying drawings: Figure 1 Figs. 1 to 3:

[0067] Capacitor busbar 01; DC capacitor bank 02; input busbar 03; switch tube 04; output busbar 05; heat sink 06; connection busbar 07;

[0068] Input tube 04a; output tube 04b;

[0069] Positive terminal 041; first neutral terminal 042; second neutral terminal 043; negative terminal 044; first output terminal 045; second output terminal 046.

[0070] In the accompanying drawings: Figs. 4 to 19:

[0071] Heat sink 10; switch tube 20; input tube 21; output tube 22; input busbar 31; output busbar 32; connection busbar 33; single-phase switch tube group 40; first phase 41; second phase 42; third phase 43; capacitor busbar 50;

[0072] First sub-heat sink 10a; second sub-heat sink 10b; third sub-heat sink 10c;

[0073] Input busbar first part 31a; input busbar second part 31b; input busbar third part 31c;

[0074] Output busbar first part 32a; output busbar second part 32b; output busbar third part 32c;

[0075] First phase first part 41a; first phase second part 41b;

[0076] Second phase first part 42a; second phase second part 42b;

[0077] Third phase first part 43a; third phase second part 43b;

[0078] Input busbar positive plate 311; input busbar neutral plate 312; input busbar terminal post 313;

[0079] Connection busbar first part 331; connection busbar second part 332;

[0080] Capacitor busbar positive plate 51; capacitor busbar neutral plate 52; capacitor busbar negative plate 53. DETAILED DESCRIPTION

[0081] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are preferred embodiments of the present application, and should not be regarded as exclusive to other embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0082] In the claims, the specification, and the drawings of the present application, unless otherwise clearly defined, the terms such as "first", "second", or "third" are used only to distinguish different objects, and are not used to describe a specific sequence.

[0083] In the claims, the specification, and the drawings of the present application, unless otherwise clearly defined, the terms such as "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "back", "left", "right", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship based on the orientation and positional relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as limiting the specific protection scope of the present application.

[0084] In the claims, the specification, and the drawings of the present application, unless otherwise clearly defined, the terms such as "fixedly connected" or "fixedly connected" should be understood broadly, that is, any connection mode between the two without displacement relationship and relative rotation relationship, that is, it includes non-detachable fixed connection, detachable fixed connection, integration and fixed connection through other devices or elements.

[0085] In the claims, the specification, and the drawings of the present application, the terms "include", "have", and their variants are intended to mean "contain but not limited to".

[0086] For the structure of the power assembly in the prior art described in the background section, the inventors found that the reason why the power assembly of this structure has a large volume is that the three groups of single-phase switch tubes are arranged on the three heat sinks 10, and the volume of the power assembly is increased by the heat sink 10.

[0087] In addition, the inventors also found that the power assembly of this structure also has the problem of too high stray inductance, and the reason is that the input row 03 is arranged vertically relative to the capacitor busbar 01, which causes the switch module on the outer side relative to the capacitor busbar 01 to be too far away from the capacitor busbar 01, thereby causing the commutation loop to be too long and the stray inductance to increase.

[0088] To this end, the present specification provides the following examples to solve the above technical problems.

[0089] Example 1

[0090] The present example provides a power assembly, which mainly comprises a heat sink 10, a capacitor module and a power module.

[0091] The capacitor module comprises a capacitor busbar 50 and DC capacitor cells connected to each other. The capacitor busbar 50 has a connecting portion for connecting the power module. Referring to the background art, the capacitor busbar 50 has a positive plate, a neutral plate and a negative plate, which are stacked and have three input terminals respectively. The power module can take power from the capacitor busbar 50 by connecting to the capacitor busbar 50. The connecting portion is the part where the power module is connected to the capacitor busbar 50, so the position of the connecting portion on the capacitor busbar 50 is determined according to the position where the power module is connected. It can be considered that the part near the connecting portion on the capacitor busbar 50 where the power module is connected is also the connecting portion. It should be noted that the connecting portion should be flat to facilitate the connection of the power module. At the same time, the capacitor busbar 50 is usually flat, and the connecting portion is formed on the capacitor busbar 50.

[0092] The power module comprises an input busbar 31, an output busbar 32 and three single-phase switch tube groups 40. The input busbar 31 is connected to the connecting portion of the capacitor busbar 50 and connected to each single-phase switch tube group 40. Each single-phase switch tube group 40 is connected to an output busbar 32 to output single-phase alternating current. Each single-phase switch tube group 40 comprises a plurality of switch modules composed of switch tubes 20. The switch tubes 20 are IGBT devices, three switch tubes 20 cooperate to form a switch module, and a plurality of switch modules are connected in parallel to form a single-phase switch tube group 40. Each single-phase switch tube group 40 is used to output single-phase alternating current. The power module has three single-phase switch tube groups 40, which cooperate to output three-phase alternating current. In the present example, each single-phase switch tube group 40 comprises four switch modules, and a total of twelve switch tubes 20.

[0093] The types of switch tubes 20 in each switch module include input tubes 21 and output tubes 22, the number of input tubes 21 is two, and the number of output tubes 22 is one. The input terminals of the input tubes 21 form the input terminals of the corresponding switch module, and the output terminals of the output tubes 22 form the output terminals of the corresponding switch module.

[0094] Referring to the background art, the input pipes 21 and the output pipes 22 are connected by the connecting row 33, which can be a copper row. The input ends of the two input pipes 21 are connected to the connecting part of the capacitor female row 50 through the input row 31, the output ends of the two input pipes 21 are connected to the input ends of the output pipes 22 through the connecting row 33, and the output ends of the output pipes 22 are connected to the output row 32. Among them, each output pipe 22 in each single-phase switch pipe group 40 is connected to the same output row 32.

[0095] The input row 31 and the output row 32 are used to transport current in the form of hard connection, which can be a copper row or a terminal post. For example, when there are some input pipes 21 and the connecting part of the capacitor female row 50 in a single-phase switch pipe group are close to each other, it is not necessary to connect through a copper row, but can be directly connected by a terminal post.

[0096] The heat sink 10 is used to mount the switch pipe 20. After the switch pipe 20 is mounted on the heat sink 10, the heat sink 10 can take away the excess heat to avoid the switch pipe 20 from overheating during work. Conventionally, the heat sink 10 can be an air-cooled heat sink as shown in the background art. In this embodiment, it can also be an air-cooled heat sink. At this time, the side of the air-cooled heat sink 10 away from the heat dissipation fins forms a mounting surface for mounting the switch pipe 20.

[0097] However, as a preferred embodiment, a liquid-cooled heat sink is used in this embodiment. The liquid-cooled heat sink can provide higher heat dissipation efficiency and can stack more switch pipes 20 in a liquid-cooled heat sink. The liquid-cooled heat sink is generally a plate-shaped member, and both sides of the liquid-cooled heat sink can form a mounting surface.

[0098] The layout of the switch pipe 20 in the power assembly is described below.

[0099] As an optional embodiment, the three single-phase switch pipe groups 40 are mounted on one heat sink 10. In this way, the overall volume of the power assembly can be effectively reduced without the need to set multiple heat sinks 10 as described in the background art. It can be understood that in order to mount the three single-phase switch pipe groups 40 on one heat sink 10, the heat sink 10 needs to have good heat dissipation performance. At this time, the liquid-cooled heat sink used in this embodiment can be a better choice.

[0100] Further, in each single-phase switch pipe group 40, the arrangement direction of each switch module is parallel to the connecting part of the capacitor female row 50. In this way, it can be ensured that in each single-phase switch pipe group 40, the distance from each switch module to the capacitor female row 50 is equal, avoiding the problem that the lengths of the commutation loops of the switch modules at different positions in each single-phase switch pipe group 40 are inconsistent.

[0101] Further, the three single-phase switch tube groups 40 are arranged on one mounting surface of the heat sink 10, and the mounting surface is parallel to the connecting portion. The parallel mounting surface and connecting portion can be understood as the heat sink 10 in a flat plate shape and the capacitor busbar 50 in a flat plate shape arranged in a stacked manner. When the mounting surface is located on the front side of the heat sink 10, the three single-phase switch tube groups can be conveniently maintained, and when the other side of the heat sink 10 forms another mounting surface, the other mounting surface of the heat sink 10 can be used for rapid heat dissipation to improve the heat dissipation efficiency. In the embodiment, the three single-phase switch tube groups 40 are arranged on the front mounting surface of the heat sink 10, but in other embodiments, the three single-phase switch tube groups 40 can also be arranged on the rear mounting surface of the heat sink 10, and when arranged on the rear mounting surface, the switch tubes 20 and the input and output buses 31 and 32 can be arranged in the layout manner described in the embodiment.

[0102] Further, each switch module in all single-phase switch tube groups 40 is divided into two parts arranged on the upper and lower parts of the mounting surface, and each switch module in each part is arranged side by side in the left-right direction, and the input ends of the switch modules in the two parts are opposite to each other.

[0103] Further, the three single-phase switch tube groups 40 are respectively a first phase 41, a second phase 42, and a third phase 43; the first phase 41 and the second phase 42 are arranged on the upper and lower parts of the mounting surface, respectively, and the output ends of the two phases are arranged opposite to each other and located in the middle part of the mounting surface, and the output ends of the two phases are respectively connected to an output bus 32; the third phase 43 is divided into a third phase first part 43a and a third phase second part 43b according to the number of included switch modules, and the two parts are arranged on the upper and lower parts of the mounting surface, respectively, and the output ends of the two parts are located in the middle part of the mounting surface and connected to the same output bus 32. It should be noted that the "side-by-side arrangement" referred to in the specification means that the positions of the input tubes 21 of each switch module correspond to each other in the left-right direction, and the positions of the output tubes 22 also correspond to each other in the left-right direction.

[0104] The above will be further described below.

[0105] In the embodiment, among the two sides of the liquid cooling heat sink, the side away from the capacitor busbar 50 forms a mounting surface, and the power module is mounted on the mounting surface, so the power module is also arranged away from the connecting portion of the capacitor busbar 50.

[0106] Referring to Figure 4a , which shows the layout of the above-mentioned three single-phase switch tube groups 40 on the heat sink 10, and shows the corresponding directions. At the same time, referring to Figure 4b , which shows the structure of the layout when viewed from the side, and shows the corresponding directions. It should be noted that Figure 4aThe direction shown is the direction when viewed from the front side mounting surface of the heat sink 10.

[0107] In this embodiment, four switching modules constitute a single-phase switching tube group 40, and three single-phase switching tube groups 40 are respectively a first phase 41, a second phase 42, and a third phase 43. The first phase 41 and the second phase 42 each include four switching modules arranged side by side, and the third phase 43 is divided into a third phase first part 43a and a third phase second part 43b, each of which includes two switching modules arranged side by side.

[0108] In the first phase 41 and the second phase 42, the four switching modules are arranged side by side in the left-right direction, and therefore the output terminals and the input terminals of each switching module are also arranged side by side. At this time, the input terminals of the four switching modules collectively form the input terminal of the single-phase switching tube group 40, and the output terminals of the four switching modules collectively form the output terminal of the single-phase switching tube group 40.

[0109] In the third phase 43, the four switching modules are divided into two parts, and the two switching modules in each part are arranged side by side in the left-right direction. Therefore, the output terminals and the input terminals of each switching module in each part are also arranged side by side. At this time, the input terminals of the two switching modules in each part collectively form the input terminal of the part, and the output terminals of the two switching modules in each part collectively form the output terminal of the part.

[0110] Furthermore, the switching modules in the first phase 41 and the third phase first part 43a are arranged side by side, and the switching modules in the second phase 42 and the third phase second part 43b are also arranged side by side.

[0111] Referring to Figure 4a , the single-phase switching tube groups 40 of the first phase 41 and the second phase 42 are arranged symmetrically in the up-down direction, that is, the input terminal and the output terminal of the first phase 41 are respectively located on the upper side and the lower side, and the input terminal and the output terminal of the second phase 42 are respectively located on the lower side and the upper side, with the output terminals facing each other and the input terminals facing away from each other. When installed on the heat sink 10, the input terminal of the first phase 41 corresponds to the upper edge of the heat sink 10, and the output terminal corresponds to the middle part of the heat sink 10, and the input terminal of the second phase 42 corresponds to the lower edge of the heat sink 10, and the output terminal corresponds to the middle part of the heat sink 10. The third phase first part 43a and the third phase second part 43b in the third phase 43 are also arranged symmetrically in the up-down direction, that is, the input terminal and the output terminal of the third phase first part 43a are respectively located on the upper side and the lower side, and the input terminal and the output terminal of the third phase second part 43b are respectively located on the lower side and the upper side, with the output terminals facing each other and the input terminals facing away from each other. When installed on the heat sink 10, the input terminal of the third phase first part 43a corresponds to the upper edge of the heat sink 10, and the output terminal corresponds to the middle part of the heat sink 10, and the input terminal of the third phase second part 43b corresponds to the lower edge of the heat sink 10, and the output terminal corresponds to the middle part of the heat sink 10.

[0112] With reference to Figure 4a Each single-phase switch tube group 40 is connected with the capacitor busbar 50 through the input row 31, and is respectively connected with an output row 32. The input ends of the single-phase switch tube groups 40 of the first phase 41 and the first part 43a of the third phase are located at the upper edge of the heat sink 10, so an input row first part 31a can be arranged along the upper edge of the heat sink 10; the input ends of the single-phase switch tube groups 40 of the second phase 42 and the second part 43b of the third phase are located at the lower edge of the heat sink 10, so an input row second part 31b can be arranged along the lower edge of the heat sink 10; the output ends of the first phase 41 are correspondingly arranged with an output row first part 32a, the output ends of the second phase 42 are correspondingly arranged with an output row second part 32b, and the output ends of the first part 43a and the second part 43b of the third phase are opposite to each other, so a common output row third part 32c can be correspondingly arranged.

[0113] With reference to Figure 4b The capacitor busbar 50 is located at the rear side of the heat sink 10, and the three single-phase switch tube groups 40 are arranged on the front mounting surface of the heat sink 10, and the extension direction of the input row 31 is parallel to the plate surface of the capacitor busbar 50; in this way, in each single-phase switch tube group 40, each switch module is connected with the capacitor busbar 50 through the input row 31 at an equal distance, so the length of the commutation loop of each switch module is equal, and compared with the prior art, the distance is also shorter, the stray inductance is reduced, and the switching loss is also reduced.

[0114] Specifically, the input row first part 31a includes a positive plate, a neutral plate and a negative plate, which are stacked and connected to the corresponding plates of the capacitor busbar 50; the input row second part 31b also includes a positive plate, a neutral plate and a negative plate, which are stacked and connected to the corresponding plates of the capacitor busbar 50. Since the input ends of the three single-phase switch tube groups 40 are located at the upper edge and the lower edge of the heat sink 10, respectively, the input row first part 31a and the input row second part 31b do not need to pass through the front mounting surface of the heat sink 10 to the capacitor busbar 50, and the distance between the input row first part 31a and the input row second part 31b and the capacitor busbar 50 is equal, so the DC side current loop is more balanced.

[0115] The output row first part 32a, the output row second part 32b and the output row third part 32c are located at the middle position of the front mounting surface of the heat sink 10, which is concentrated in position distribution, so as to facilitate external output wiring.

[0116] The power assembly provided in the embodiment reduces the volume of the heat sink 10, thereby reducing the overall volume of the power assembly, and reducing the generation of stray inductance.

[0117] Embodiment 2

[0118] The power assembly mainly comprises a heat sink 10, a capacitor module and a power module.

[0119] For the heat sink 10, the capacitor module and the power module, refer to Embodiment 1.

[0120] The layout of the switch tubes 20 in the power assembly is described as follows.

[0121] As an optional embodiment, the three single-phase switch tube groups 40 are divided into two parts to be respectively arranged on the two mounting surfaces of the heat sink 10. In this embodiment, the two side surfaces of the liquid-cooled heat sink are formed as mounting surfaces, and the power module is mounted on the two mounting surfaces. In this way, the volume of the heat sink 10 can be reduced, the space utilization of the heat sink 10 is further improved, and the overall volume of the power assembly is reduced. Moreover, the two mounting surfaces are parallel to the connecting portion. Here, the mounting surfaces parallel to the connecting portion means that the flat heat sink 10 and the flat capacitor busbar 50 are arranged in a stacked manner.

[0122] Further, in each single-phase switch tube group 40, the switch modules are arranged side by side along the left-right direction. Among them, one complete single-phase switch tube group 40 is located on the front mounting surface of the heat sink 10, another complete single-phase switch tube group 40 is located on the rear mounting surface of the heat sink 10, and in the last single-phase switch tube group 40, the output tubes 22 in the switch modules are located on the front mounting surface of the heat sink 10, and the input tubes 21 in the switch modules are located on the rear mounting surface of the heat sink 10. It should be noted that in the last single-phase switch tube group 40, the output tubes 22 are arranged side by side along the left-right direction, and the input tubes 21 are also arranged side by side along the left-right direction.

[0123] The above is further described as follows.

[0124] Referring to Figure 5a , the layout of the three single-phase switch tube groups 40 on the heat sink 10 in this embodiment is shown, and the corresponding directions are shown. At the same time, referring to Figure 5b , the structure of the layout when viewed from the side is shown, and the corresponding directions are shown. It should be noted that Figure 5a The directions shown are the directions when viewed from the front of the heat sink 10 towards the front mounting surface of the heat sink 10, that is, Figure 5a The directions shown are only used to indicate the directions of the front view in Figure 5a .

[0125] Referring to Figure 5aIn this embodiment, four switch modules constitute a single-phase switch tube group 40, and three single-phase switch tube groups 40 are respectively a first phase 41, a second phase 42 and a third phase 43. Among them, the first phase 41 and the second phase 42 include four switch modules arranged side by side, and the third phase 43 is divided into a third phase first part 43a and a third phase second part 43b. The third phase first part 43a includes all output tubes 22 of each switch module in the single-phase switch tube group 40, and the third phase second part 43b includes all input tubes 21 of each switch module in the single-phase switch tube group 40.

[0126] Referring to Figure 5a The single-phase switch tube group 40 of the first phase 41 is located on the front side mounting surface of the heat sink 10, the single-phase switch tube group 40 of the second phase 42 is located on the rear side mounting surface of the heat sink 10, the third phase first part 43a is located on the front side mounting surface of the heat sink 10, and the third phase second part 43b is located on the rear side mounting surface of the heat sink 10.

[0127] In the first phase 41 and the second phase 42, the four switch modules are arranged side by side along the left-right direction, so the output end and the input end of each switch module are also arranged side by side. At this time, the input ends of the four switch modules collectively form the input end of the single-phase switch tube group 40, and the output ends of the four switch modules collectively form the output end of the single-phase switch tube group 40. Moreover, the input end and the output end of the single-phase switch tube group 40 of the first phase 41 and the second phase 42 are located on the upper side and the lower side respectively. When installed on the heat sink 10, the input end of the first phase 41 and the second phase 42 corresponds to the upper edge of the heat sink 10, and the difference is that one is on the front side of the heat sink 10 and the other is on the rear side of the heat sink 10. At the same time, the output end of the first phase 41 and the second phase 42 corresponds to the middle part of the heat sink 10.

[0128] The third phase first part 43a corresponds to the output tubes 22 of each switch module in the single-phase switch tube group 40 of the third phase 43. The four output tubes 22 are arranged side by side along the left-right direction, and the output ends of the four output tubes 22 are also arranged side by side. At this time, the output ends of the four output tubes 22 collectively form the output end of the single-phase switch tube group 40. The third phase second part 43b corresponds to the input tubes 21 of each switch module in the single-phase switch tube group 40 of the third phase 43. The eight input tubes 21 are arranged side by side along the left-right direction, and the two input tubes 21 in the same switch module are arranged close to each other. The input ends of the eight input tubes 21 are also arranged side by side. At this time, the input ends of the eight input tubes 21 collectively form the input end of the single-phase switch tube group 40. In the third phase 43, the output end and the input end of the single-phase switch tube group 40 are both located on the lower side. When installed on the heat sink 10, the output end and the input end of the single-phase switch tube group 40 both correspond to the upper edge of the heat sink 10, and the difference is that the output end is located on the front side of the heat sink 10 and the input end is located on the rear side of the heat sink 10.

[0129] Referring to Figure 5a Each single-phase switch tube group 40 is connected with the capacitor busbar 50 through the input row 31, and is respectively connected with an output row 32. The input ends of the single-phase switch tube groups 40 of the first phase 41 and the second phase 42 are located at the upper edge of the heat sink 10, so that the input row first part 31a and the input row second part 31b can be arranged at the upper edge of the heat sink 10, and the input row first part 31a and the input row second part 31b can be connected in parallel and then connected with the capacitor busbar 50; the input end of the third phase second part 43b is located at the lower edge of the heat sink 10, so that the input row third part 31c can be arranged at the lower edge of the heat sink 10.

[0130] Referring to Figure 5b The output ends of the single-phase switch tube groups 40 of the first phase 41 and the second phase 42 are located at the middle of the heat sink 10, so that the output row first part 32a and the second part can be arranged at the middle of the heat sink 10. It should be noted that the output row first part 32a is located at the front side of the heat sink 10, and it can directly output the wiring to the outside, but the output row second part 32b is located at the rear side of the heat sink 10, and if it wants to output the wiring to the outside, it requires that there is enough space between the rear side mounting surface of the heat sink 10 and the capacitor busbar 50, which is not conducive to the length of the overall commutation loop of the power module. Therefore, a hole can be arranged at the middle of the heat sink 10, and the output row second part 32b can be led out from the rear side of the heat sink 10 to the front side of the heat sink 10, so that the output row second part 32b can be conveniently outputted to the outside.

[0131] The output end of the third phase first part 43a is located at the lower edge of the heat sink 10, and the output row third part 32c can be arranged at the lower edge of the heat sink 10. In the third phase 43, the two input tubes 21 and the output tube 22 of each switch module are located at both sides of the heat sink 10, so that a hole can be arranged at the corresponding position of the heat sink 10, and the input tube 21 and the output tube 22 of each switch module are connected through the connecting row 33. In order to facilitate processing, since the position of the connecting row 33 in the third phase 43 also corresponds to the middle of the heat sink 10, only one hole can be arranged at the middle of the heat sink 10, and the hole can be used to pass through the connecting row 33 and the output row second part 32b at the same time.

[0132] Referring to Figure 5b The capacitor busbar 50 is located at the rear side of the heat sink 10, and the extension direction of the input row 31 is parallel to the plate surface of the capacitor busbar 50; in this way, in each single-phase switch tube group 40, each switch module is connected with the capacitor busbar 50 through the input row 31 at the same distance, and the length of the commutation loop of each switch module is also equal, so that the stray inductance is reduced, and the switching loss is also reduced.

[0133] Specifically, the first part 31a of the input row includes positive plates, neutral plates and negative plates, which are stacked and connected to corresponding plates of the capacitor busbar 50; the input row 31 also includes positive plates, neutral plates and negative plates, which are stacked and connected to corresponding plates of the capacitor busbar 50. Since the input ends of the three single-phase switch tube groups 40 are located at the upper edge and the lower edge of the heat sink 10, the first part 31a, the second part and the third part of the input row to the capacitor busbar 50 do not need to pass through the front side mounting surface of the heat sink 10. Among them, the distance from the second part 31b of the input row to the capacitor busbar 50 and the distance from the third part 31c of the input row to the capacitor busbar 50 are equal, and the direct current side current loop is more balanced. At the same time, although the current loop distance between the single-phase switch tube group 40 corresponding to the first phase 41 and the capacitor busbar 50 is slightly longer, by arranging the input row 31 in a stacked manner, the stray inductance is reduced, which can meet the use requirements.

[0134] Compared with embodiment 1, the power assembly provided in the embodiment further reduces the volume of the heat sink 10, improves the surface space utilization rate of the heat sink 10, and reduces the overall volume of the power assembly, while reducing the generation of stray inductance, by arranging the switch tubes 20 on the front and rear sides of the heat sink 10.

[0135] Embodiment 3

[0136] The embodiment provides a power assembly, which mainly includes a heat sink 10, a capacitor module and a power module.

[0137] For the introduction of the heat sink 10, the capacitor module and the power module, reference is made to embodiment 1.

[0138] The layout of the switch tubes 20 in the power assembly is described below.

[0139] In the embodiment, a liquid cooling heat sink is used. The liquid cooling heat sink can provide higher heat dissipation efficiency, and more switch tubes 20 can be stacked in one liquid cooling heat sink. The liquid cooling heat sink is generally a plate-shaped member, and both sides thereof can form mounting surfaces.

[0140] As an optional implementation, the three single-phase switch tube groups 40 are arranged in parallel along the up-down direction.

[0141] Among them, in each single-phase switch tube group 40, the output tube 22 of the switch module is located on the front side mounting surface of the heat sink 10, and the input tube 21 of the switch module is located on the rear side mounting surface of the heat sink 10. In the embodiment, the two mounting surfaces are parallel to the connecting portion. Here, the mounting surfaces parallel to the connecting portion can be regarded as the heat sink 10 in a plate shape and the capacitor busbar 50 in a plate shape arranged in a stacked manner.

[0142] Corresponding to the layout, for the "parallel arrangement" of the single-phase switch tube group 40, it means that in each single-phase switch tube group 40, each output tube 22 is arranged in parallel along the left-right direction, and each input tube 21 is also arranged in parallel along the left-right direction. The "parallel arrangement" mentioned above means that each single-phase switch tube group 40 is taken as a whole, and the arrangement direction of each switch module in each single-phase switch tube group 40 is the extension direction of the whole single-phase switch tube group 40, that is, each single-phase switch tube group 40 extends along the left-right direction, and under the premise, the three single-phase switch tube groups 40 are arranged in parallel from top to bottom on the heat sink 10.

[0143] Further, in each single-phase switch tube group 40, the output end and the input end are located below the single-phase switch tube group 40.

[0144] The above is further described as follows.

[0145] Referring to Figure 6a , the layout of the three single-phase switch tube groups 40 on the heat sink 10 in the embodiment is shown, and the corresponding directions are shown. At the same time, referring to Figure 6b , the structure of the layout when viewed from the side is shown, and the corresponding directions are shown. It should be noted that Figure 6a The directions shown are the directions when viewed from the front side of the heat sink 10, that is, the directions when viewed from the front side mounting surface of the heat sink 10. Figure 6a The directions shown are only used to indicate the directions of the front side view in Figure 6a .

[0146] Referring to Figure 6a , in this embodiment, there are four switch modules in each single-phase switch tube group 40, and three single-phase switch tube groups 40 are respectively the first phase 41, the second phase 42 and the third phase 43. Among them, the first phase 41, the second phase 42 and the third phase 43 are each divided into two parts, which are the first phase first part 41a, the first phase second part 41b, the second phase first part 42a, the second phase second part 42b, the third phase first part 43a and the third phase second part 43b. The first part of each phase corresponds to each input tube 21 in the single-phase switch tube group 40, and the second part of each phase corresponds to each output tube 22 in the single-phase switch tube group 40.

[0147] Referring to Figure 6a , in each single-phase switch tube group 40, the input ends of the four switch modules collectively form the input end of the single-phase switch tube group 40, and the output ends of the four switch modules collectively form the output end of the single-phase switch tube group 40.

[0148] The first phase 41 is located at the upper part of the heat sink 10, the second phase 42 is located at the middle part of the heat sink 10, and the third phase 43 is located at the lower part of the heat sink 10. Correspondingly, the first phase first part 41a is located at the rear side mounting surface of the upper part of the heat sink 10, the first phase second part 41b is located at the front side mounting surface of the upper part of the heat sink 10, and the first phase first part 41a and the first phase second part 41b are connected by the connecting row 33 which bypasses the upper edge of the heat sink 10. The second phase first part 42a is located at the rear side mounting surface of the middle part of the heat sink 10, the second phase second part 42b is located at the front side mounting surface of the middle part of the heat sink 10, and the second phase first part 42a and the second phase second part 42b are connected by the connecting row 33. In this embodiment, the connecting row 33 can pass through the opening provided at the corresponding position of the heat sink 10 to connect the second phase first part 42a and the second phase second part 42b. The third phase first part 43a is located at the rear side mounting surface of the lower part of the heat sink 10, the third phase second part 43b is located at the front side mounting surface of the lower part of the heat sink 10, and the third phase first part 43a and the third phase second part 43b are connected by the connecting row 33. Similarly, the connecting row 33 can pass through the opening provided at the corresponding position of the heat sink 10 to connect the third phase first part 43a and the third phase second part 43b.

[0149] With reference to Figure 6a Each single-phase switch tube group 40 is connected to the capacitor bus 50 through the input row 31 and is respectively connected to an output row 32. The input end of the first phase 41 is connected to the input row first part 31a which is located below the first phase first part 41a, and the output end of the first phase 41 is connected to the output row first part 32a which is located below the first phase second part 41b. The input end of the second phase 42 is connected to the input row second part 31b which is located below the second phase first part 42a, and the output end of the second phase 42 is connected to the output row second part 32b which is located below the second phase second part 42b. The input end of the third phase 43 is connected to the input row third part 31c which is located below the third phase first part 43a, and the output end of the third phase 43 is connected to the output row third part 32c which is located below the third phase second part 43b.

[0150] With reference to Figure 6bThe capacitor busbar 50 is located at the rear side of the heat sink 10, and the extension direction of the input busbar 31 is parallel to the plate surface of the capacitor busbar 50. In this way, in each single-phase switch tube group 40, each switch module is connected to the capacitor busbar 50 through the input busbar 31 at the same distance, the length of the commutation loop of each switch module is also equal, the stray inductance is reduced, and the switching loss is reduced accordingly.

[0151] Specifically, the input busbar first part 31a, the input busbar second part 31b and the input busbar third part 31c each include a positive plate, a neutral plate and a negative plate, which are stacked and connected to the corresponding plate of the capacitor busbar 50. Since the input ends of the three single-phase switch tube groups 40 are located at the rear side of the heat sink 10, the input busbar first part 31a, the second part and the third part can be directly connected to the capacitor busbar 50, and the distance between the input end of each single-phase switch tube group 40 and the capacitor busbar 50 is equal, which can improve the balance of the DC side current loop. At the same time, the output end of each single-phase switch tube group 40 is located at the front side of the heat sink 10, so the output busbar first part 32a, the second part and the third part are easy to output externally.

[0152] The power assembly provided in the embodiment further reduces the volume of the heat sink 10, improves the surface space utilization rate of the heat sink 10, and reduces the overall volume of the power assembly and the generation of stray inductance by arranging the switch tubes 20 on the front and rear sides of the heat sink 10 compared to the embodiment 1.

[0153] Further, the number of heat sinks 10 in the embodiment is one, but in other embodiments, the number of heat sinks 10 can be set to three, and the three heat sinks 10 are arranged in the up-down direction, and a complete single-phase switch tube group 40 is installed on each heat sink 10. The wiring mode of the single-phase switch tube group 40 can refer to the wiring mode of each single-phase switch tube group 40 in the embodiment, but in the case of using three heat sinks 10, the connection busbar 33 in each single-phase switch tube group 40 can directly bypass the upper edge or lower edge of the heat sink 10 where it is located. Using three heat sinks 10 reduces the heat dissipation requirement of a single heat sink 10, reduces the cost of the heat sink 10, and facilitates wiring and maintenance of the single-phase switch tube group on each heat sink 10.

[0154] Embodiment 4

[0155] The embodiment provides a power assembly, which mainly includes a heat sink 10, a capacitor module and a power module.

[0156] For the introduction of the heat sink 10, the capacitor module and the power module, refer to embodiment 1.

[0157] The layout of the switch tube 20 in the power assembly is described below.

[0158] In this embodiment, a liquid-cooled heat sink is used. The liquid-cooled heat sink can provide higher heat dissipation efficiency, and more switching tubes 20 can be stacked in one liquid-cooled heat sink. The liquid-cooled heat sink is generally a plate-shaped member, and both sides thereof can form mounting surfaces.

[0159] In this embodiment, in each single-phase switching tube group 40, the output tubes 22 of the switching modules are located on the front mounting surface of the heat sink 10, and the input tubes 21 of the switching modules are located on the rear mounting surface of the heat sink 10. In this embodiment, both mounting surfaces are parallel to the connecting portion. Here, the mounting surfaces being parallel to the connecting portion can be regarded as the plate-shaped heat sink 10 and the plate-shaped capacitor busbar 50 being arranged in a stacked manner.

[0160] Corresponding to this arrangement, the above-mentioned "parallel arrangement" means that, in each single-phase switching tube group 40, each output tube 22 is arranged in parallel along the left-right direction, and each input tube 21 is also arranged in parallel along the left-right direction. The above-mentioned "parallel arrangement" means that, taking each single-phase switching tube group 40 as a whole, the arrangement direction of each switching module in the single-phase switching tube group 40 is the overall extension direction of the single-phase switching tube group 40, that is, each single-phase switching tube group 40 extends along the left-right direction, and under this premise, the three single-phase switching tube groups 40 are arranged in parallel from top to bottom on the heat sink 10.

[0161] Further, in the two single-phase switching tube groups 40 located above, the output end and the input end are located below the respective single-phase switching tube groups 40; in the two single-phase switching tube groups 40 located below, the output end and the input end are located above the respective single-phase switching tube groups 40.

[0162] Referring to Figure 7a , the arrangement of the three single-phase switching tube groups 40 on the heat sink 10 in this embodiment is shown, and the corresponding directions are shown. At the same time, referring to Figure 7b , the structure of the arrangement when viewed from the side is shown, and the corresponding directions are shown. It should be noted that Figure 7a the directions shown are the directions when viewed from the front of the heat sink 10 towards the front mounting surface of the heat sink 10, that is, Figure 7a the directions shown are only used to indicate the directions of the front view in Figure 7a .

[0163] Referring to Figure 7aIn this embodiment, four switch modules constitute a single-phase switch tube group 40, and three single-phase switch tube groups 40 are respectively a first phase 41, a second phase 42, and a third phase 43. Among them, the first phase 41, the second phase 42, and the third phase 43 are each divided into two parts, which are respectively a first phase first part 41a, a first phase second part 41b, a second phase first part 42a, a second phase second part 42b, a third phase first part 43a, and a third phase second part 43b. The first part of each phase corresponds to each input tube 21 in the single-phase switch tube group 40, and the second part of each phase corresponds to each output tube 22 in the single-phase switch tube group 40.

[0164] Referring to Figure 7a In each single-phase switch tube group 40, the input ends of the four switch modules collectively form the input end of the single-phase switch tube group 40, and the output ends of the four switch modules collectively form the output end of the single-phase switch tube group 40.

[0165] Among them, the first phase 41 is located at the upper position of the heat sink 10, the second phase 42 is located at the middle position of the heat sink 10, and the third phase 43 is located at the lower position of the heat sink 10. Correspondingly, the first phase first part 41a is located at the rear side mounting surface of the upper position of the heat sink 10, the first phase second part 41b is located at the front side mounting surface of the upper position of the heat sink 10, and the first phase first part 41a and the first phase second part 41b are connected by the connecting row 33, and the connecting row 33 bypasses the upper edge of the heat sink 10. The second phase first part 42a is located at the rear side mounting surface of the middle position of the heat sink 10, the second phase second part 42b is located at the front side mounting surface of the middle position of the heat sink 10, and the second phase first part 42a and the second phase second part 42b are connected by the connecting row 33. Here, referring to Embodiment 2, an opening is provided at the corresponding position of the heat sink 10, and the connecting row 33 can pass through the opening to connect the second phase first part 42a and the second phase second part 42b. The third phase first part 43a is located at the rear side mounting surface of the lower position of the heat sink 10, the third phase second part 43b is located at the front side mounting surface of the lower position of the heat sink 10, and the third phase first part 43a and the third phase second part 43b are connected by the connecting row 33. Similarly, the third phase first part 43a and the third phase second part 43b are connected by the connecting row 33, and the connecting row 33 bypasses the lower edge of the heat sink 10.

[0166] Referring to Figure 7aEach single-phase switch tube group 40 is connected with the capacitor busbar 50 through the input row 31, and is respectively connected with an output row 32. The input end of the first phase 41 is connected with the input row first part 31a, and the input row first part 31a is located below the first phase first part 41a. The output end of the first phase 41 is connected with the output row first part 32a, and the output row first part 32a is located below the first phase second part 41b. The input end of the second phase 42 is connected with the input row second part 31b, and the input row second part 31b is located below the second phase first part 42a. The output end of the second phase 42 is connected with the output row second part 32b, and the output row second part 32b is located below the second phase second part 42b. The input end of the third phase 43 is connected with the input row third part 31c, and the input row third part 31c is located above the third phase first part 43a. The output end of the third phase 43 is connected with the output row third part 32c, and the output row third part 32c is located above the third phase second part 43b.

[0167] With reference to Figure 7b The capacitor busbar 50 is located at the rear side of the heat sink 10, and the extension direction of the input row 31 is parallel to the plate surface of the capacitor busbar 50. In this way, in each single-phase switch tube group 40, the distance between each switch module and the capacitor busbar 50 through the input row 31 is equal, and the length of the commutation loop of each switch module is also equal, so that the stray inductance is reduced, and the switching loss is reduced.

[0168] Specifically, the input row first part 31a includes a positive plate, a neutral plate and a negative plate, which are stacked and connected to the corresponding plates of the capacitor busbar 50. The input row 31 also includes a positive plate, a neutral plate and a negative plate, which are stacked and connected to the corresponding plates of the capacitor busbar 50. Since the input ends of the three single-phase switch tube groups 40 are located at the rear side of the heat sink 10, the input row first part 31a, the second part and the third part can be directly connected to the capacitor busbar 50, and the distance between the input end of each single-phase switch tube group 40 and the capacitor busbar 50 is equal, which can improve the balance of the DC side current loop. At the same time, the output end of each single-phase switch tube group 40 is located at the front side of the heat sink 10, so the output row first part 32a, the second part and the third part are easy to output the connection externally.

[0169] In addition, compared with the embodiment 3, the input ends of the second phase first part 42a and the third phase first part 43a can be connected in parallel and then connected with the capacitor busbar 50, so that the total length of the input row second part 31b and the input row third part 31c can be reduced, which is conducive to reducing the stray inductance and reducing the cost.

[0170] Compared with the power assembly of Embodiment 1, the power assembly of the present embodiment further reduces the volume of the heat sink 10, improves the surface space utilization of the heat sink 10, and reduces the overall volume of the power assembly and the generation of stray inductance by arranging the switching tubes 20 on the front and back sides of the heat sink 10.

[0171] Embodiment 5

[0172] The present embodiment provides a power assembly, which mainly comprises a heat sink 10, a capacitor module, and a power module.

[0173] For the heat sink 10, the capacitor module, and the power module, refer to Embodiment 1.

[0174] The arrangement of the switching tubes 20 in the power assembly is described below.

[0175] Conventionally, the heat sink 10 can be an air-cooled heat sink as shown in the background art, and in the present embodiment, the heat sink 10 can also be an air-cooled heat sink. At this time, the side of the air-cooled heat sink 10 opposite to the heat dissipation fins forms a mounting surface for mounting the switching tubes 20. However, as a preferred embodiment, a liquid-cooled heat sink is used in the present embodiment. The liquid-cooled heat sink can provide higher heat dissipation efficiency, and more switching tubes 20 can be stacked in a liquid-cooled heat sink. The liquid-cooled heat sink is generally a plate-shaped member, and both sides of the liquid-cooled heat sink can form mounting surfaces.

[0176] As an optional embodiment, in the power module, each single-phase switching tube group is arranged side by side on the heat sink 10, and the arrangement direction of each single-phase switching tube group is parallel to the connecting portion. In each single-phase switching tube group, the arrangement direction of each switching module is consistent with the arrangement direction of each single-phase switching tube group. In each single-phase switching tube group 40, the arrangement direction of each switching module is parallel to the connecting portion of the capacitor busbar 50. In this way, the distance from each switching module to the capacitor busbar 50 in each single-phase switching tube group 40 can be ensured to be equal, thereby avoiding the problem that the lengths of the commutation circuits of the switching modules at different positions in each single-phase switching tube group 40 are inconsistent.

[0177] Further, the three single-phase switch tube groups 40 are arranged on one mounting surface of the heat sink 10. In the embodiment, the mounting surface is parallel to the connecting portion. The parallel mounting surface and connecting portion can be understood as the heat sink 10 and the capacitor busbar 50 being arranged in a stacked manner. When the mounting surface is located on the front side of the heat sink 10, the three single-phase switch tube groups can be conveniently maintained, and when the other side of the heat sink 10 forms another mounting surface, the other mounting surface of the heat sink 10 can be used for rapid heat dissipation, improving the heat dissipation efficiency. In the embodiment, the three single-phase switch tube groups 40 are arranged on the front mounting surface of the heat sink 10, but in other embodiments, the three single-phase switch tube groups 40 can also be arranged on the rear mounting surface of the heat sink 10, and when arranged on the rear mounting surface, the switch tubes 20 and the input and output busbars 31 and 32 can be arranged in the layout described in the embodiment.

[0178] The above is further described below.

[0179] Specifically, referring to Figure 8a which shows the layout of the three single-phase switch tube groups 40 on the heat sink 10 and shows the corresponding directions. Meanwhile, referring to Figure 8b which shows the structure of the layout in the side view and shows the corresponding directions. It should be noted that Figure 8a The directions shown are the directions when viewed from the front side of the heat sink 10.

[0180] In the embodiment, the single-phase switch tube group 40 is composed of four switch modules, and the three single-phase switch tube groups 40 are the first phase 41, the second phase 42, and the third phase 43, wherein the first phase 41, the second phase 42, and the third phase 43 each include four switch modules arranged side by side in the left-right direction. The output and input ends of each switch module are also arranged side by side, and at this time, the input ends of the four switch modules collectively form the input end of the single-phase switch tube group 40, and the output ends of the four switch modules collectively form the output end of the single-phase switch tube group 40.

[0181] Referring to Figure 8a Each single-phase switch tube group 40 is connected to the capacitor busbar 50 through the input busbar 31, and each has an output busbar 32. The input and output ends of each phase of the three single-phase switch tube groups 40 are located above and below, respectively, so that an input busbar 31 can be arranged along the upper edge of the heat sink 10, and the input busbar 31 is connected to the three single-phase switch tube groups 40 at the same time. Meanwhile, three output busbars 32 can be arranged along the lower edge of the heat sink 10, corresponding to the first phase 41, the second phase 42, and the third phase 43, which are output busbar first portion 32a, output busbar second portion 32b, and output busbar third portion 32c, respectively.

[0182] Reference Figure 8b The capacitor busbar 50 is located on the rear side of the heat sink 10, and the three single-phase switch tube groups 40 are mounted on the front mounting surface of the heat sink 10, with the extension direction of the input busbar 31 parallel to the plate surface of the capacitor busbar 50. Thus, in each single-phase switch tube group 40, the distance between each switch module and the capacitor busbar 50 connected through the input busbar 31 is equal, and the commutation circuit length of each switch module is also equal, thereby reducing stray inductance and switching losses.

[0183] Specifically, the first part 31a of the input busbar includes a positive plate, a neutral plate, and a negative plate, which are stacked and connected to the corresponding plates of the capacitor busbar 50. The input busbar 31 also includes a positive plate, a neutral plate, and a negative plate, which are stacked and connected to the corresponding plates of the capacitor busbar 50. Since the input terminals of the three single-phase switching transistor groups 40 are all located on the upper edge of the heat sink 10, only one input busbar 31 is needed to connect to the capacitor busbar 50. Therefore, the distance between each single-phase switching transistor group 40 and the capacitor busbar 50 is equal, and the current loop distance between the three single-phase switching transistor groups 40 and the capacitor busbar 50 is consistent. Regardless of the current direction of the capacitor busbar 50, the arrival time of each single-phase switching transistor group 40 is also equal, thus achieving the best current loop balance.

[0184] The first part 32a, the second part 32b, and the third part 32c of the output bar are all located below the front mounting surface of the heat sink 10. Their concentrated distribution facilitates external output wiring.

[0185] The power component provided in this embodiment, compared with embodiments 1 to 4, arranges each single-phase switch group 40 in parallel, so that the current loop distance between the three single-phase switch groups 40 and the capacitor bus 50 is consistent. Therefore, the current loop balance from the capacitor bus 50 to each single-phase switch group 40 is improved, and stray inductance is reduced.

[0186] Example 6

[0187] This embodiment provides a power component, which mainly includes a heat sink 10, a capacitor module and a power module.

[0188] For an introduction to the heat sink 10, capacitor module and power module, please refer to Example 1.

[0189] The layout of the switching transistor 20 in the power component described above will be explained below.

[0190] This embodiment employs a liquid-cooled heat sink. Liquid-cooled heat sinks offer higher heat dissipation efficiency, allowing for the packing of more switching transistors 20 within a single unit. Liquid-cooled heat sinks are typically plate-shaped components, with mounting surfaces formed on both sides.

[0191] As an alternative embodiment, the three single-phase switch tube groups 40 are divided into two parts to be arranged on the two mounting surfaces of the heat sink 10, and the switch modules on each mounting surface are arranged side by side along the left-right direction. In this embodiment, the two mounting surfaces are parallel to the connecting portion. The mounting surfaces parallel to the connecting portion can be regarded as that the flat heat sink 10 and the flat capacitor busbar 50 are arranged in a stacked manner. In this way, the volume of the heat sink 10 can be reduced, the space utilization of the heat sink 10 is further improved, and the overall volume of the power assembly is reduced.

[0192] The above is further described as follows.

[0193] In this embodiment, one complete single-phase switch tube group 40 is arranged on the front mounting surface of the heat sink 10, another complete single-phase switch tube group 40 is arranged on the rear mounting surface of the heat sink 10, and the last single-phase switch tube group 40 is divided into two parts, each part of which is arranged side by side, and the two parts are arranged on the front mounting surface and the rear mounting surface of the heat sink 10, respectively.

[0194] Referring to Figure 9a , the layout of the three single-phase switch tube groups 40 on the heat sink 10 in this embodiment is shown, and the corresponding directions are shown. Meanwhile, referring to Figure 9b , the structure of the layout when viewed from the side is shown, and the corresponding directions are shown. It should be noted that Figure 9a , the directions shown are the directions when viewed from the front of the heat sink 10 towards the front mounting surface of the heat sink 10, that is, Figure 9a , the directions shown are only used to indicate the directions of the front view in Figure 9a .

[0195] Referring to Figure 9a , in this embodiment, four switch modules constitute a single-phase switch tube group 40, and three single-phase switch tube groups 40 are the first phase 41, the second phase 42 and the third phase 43. Among them, the first phase 41 and the second phase 42 include four switch modules arranged side by side, and the third phase 43 is divided into a third phase first part 43a and a third phase second part 43b, each part including two switch modules arranged side by side. Among them, the first phase 41 and the third phase first part 43a are arranged on the front mounting surface of the heat sink 10, and the second phase 42 and the third phase second part 43b are arranged on the rear mounting surface of the heat sink 10. On the front mounting surface of the heat sink 10, the first phase 41 and the third phase first part 43a are arranged side by side along the left-right direction; on the rear mounting surface of the heat sink 10, the second phase 42 and the third phase second part 43b are arranged side by side along the left-right direction.

[0196] In the first phase 41 and the second phase 42, four switch modules are arranged side by side along the left-right direction, so the output end and the input end of each switch module are also arranged side by side, at this time, the input ends of the four switch modules jointly form the input end of the single-phase switch tube group 40, and the output ends of the four switch modules jointly form the output end of the single-phase switch tube group 40.

[0197] In the third phase 43, the four switch modules are divided into two parts, and two switch modules in each part are arranged side by side along the left-right direction, so the output end and the input end of each switch module in each part are also arranged side by side, at this time, the input ends of the two switch modules in each part jointly form the input end of the part, and the output ends of the two switch modules in each part jointly form the output end of the part.

[0198] Referring to Figure 9a , the input ends of the first phase 41, the second phase 42 and the third phase 43 are all located on the upper side. When installed on the heat sink 10, that is, the input ends of the first phase 41, the second phase 42 and the third phase 43 correspond to the upper edge of the heat sink 10, and the output ends correspond to the lower edge of the heat sink 10. At the same time, each single-phase switch tube group 40 is connected with the capacitor bus 50 through the input row 31, and is respectively connected with an output row 32. Therefore, an input row 31 can be arranged along the upper edge of the heat sink 10, and the input row 31 is connected with the input ends of the first phase 41, the second phase 42 and the third phase 43 at the same time; and three output rows 32 can be arranged along the lower edge of the heat sink 10, which are output row first part 32a, output row second part 32b and output row third part 32c respectively, and the three output rows are connected with the output ends of the first phase 41, the second phase 42 and the third phase 43 respectively.

[0199] Among them, for the output row third part 32c, since the third phase 43 is divided into the third phase first part 43a and the third phase second part 43b, and the two are located on the front mounting surface and the rear mounting surface of the heat sink 10 respectively, and the output row third part 32c needs to be connected with the output ends of the third phase first part 43a and the third phase second part 43b at the same time, so the output row third part 32c can bypass the right side edge of the heat sink 10, at this time, the output row third part 32c can be connected with the output ends of the third phase first part 43a and the third phase second part 43b at the same time.

[0200] Referring to Figure 9b , the capacitor bus 50 is located on the rear side of the heat sink 10, and the three single-phase switch tube groups 40 are installed on the front mounting surface and the rear mounting surface of the heat sink 10, and the extension direction of the input row 31 is parallel to the board surface of the capacitor bus 50; in this way, in each single-phase switch tube group 40, the distance between each switch module and the capacitor bus 50 connected through the input row 31 is equal, and the length of the commutation loop of each switch module is also equal, so the stray inductance is reduced, and the switching loss is also reduced.

[0201] Referring to Figure 9b Since the input ends of the three single-phase switch tube groups 40 are all located on the upper edge of the heat sink 10, only one input row 31 is needed to connect the capacitor busbar 50, so the distance between each single-phase switch tube group 40 and the capacitor busbar 50 is equal, the current loop distance between the three single-phase switch tube groups 40 and the capacitor busbar 50 is consistent, and regardless of the current direction of the capacitor busbar 50, the time to reach each single-phase switch tube group 40 is also equal, thus having the best current loop balance. At the same time, referring to Figure 9b , the input end of the second phase 42 can be connected in parallel with the input row 31 connecting the input end of the first phase 41 and then connected with the capacitor busbar 50, thereby reducing the total length of the input row 31, reducing the manufacturing cost, and also reducing the stray inductance.

[0202] The output row first part 32a, the output row second part 32b, and the output row third part 32c are all located on the lower edge of the heat sink 10, and the position distribution is concentrated, which can facilitate external output wiring.

[0203] The power assembly provided by the embodiment, compared with embodiments 1 to 4, by arranging the single-phase switch tube groups 40 side by side, the current loop distance between the three single-phase switch tube groups and the capacitor busbar 50 is consistent, thus improving the current loop balance of the capacitor busbar 50 to each single-phase switch tube group 40, while reducing the stray inductance. At the same time, compared with embodiment 5, by arranging the switch tubes 20 on the front and back sides of the heat sink 10, the volume of the heat sink 10 is further reduced, the surface space utilization rate of the heat sink 10 is improved, and the overall volume of the power assembly is also reduced.

[0204] Embodiment 7

[0205] The embodiment provides a power assembly, which mainly comprises a heat sink 10, a capacitor module, and a power module.

[0206] For the introduction of the capacitor module and the power module, refer to embodiment 1, and only the difference between the two will be described below.

[0207] The layout of the switch tube 20 in the above power assembly will be described below.

[0208] As an optional implementation, the three single-phase switch tube groups 40 are respectively arranged on the three heat sinks 10. In this way, the heat dissipation requirement of each heat sink 10 is reduced, thereby reducing the cost of the heat sink 10.

[0209] Further, in the power module, each single-phase switch tube group is arranged side by side on the heat sink 10, and the arrangement direction of each single-phase switch tube group is parallel to the connecting portion; in each single-phase switch tube group, the arrangement direction of each switch module is consistent with the arrangement direction of each single-phase switch tube group. In each single-phase switch tube group 40, the arrangement direction of each switch module is parallel to the connecting portion of the capacitor busbar 50. In this way, the distance from each switch module to the capacitor busbar 50 in each single-phase switch tube group 40 can be ensured to be equal, thereby avoiding the problem of inconsistent lengths of commutation circuits of switch modules at different positions in each single-phase switch tube group 40.

[0210] Further, the three single-phase switch tube groups 40 are arranged on one mounting surface of the heat sink 10. In this embodiment, the mounting surface is parallel to the connecting portion. The parallel mounting surface and connecting portion can be regarded as a stacked arrangement between the flat heat sink 10 and the flat capacitor busbar 50. When the mounting surface is located on the front side of the heat sink 10, it is convenient to maintain the three single-phase switch tube groups. When the other side of the heat sink 10 forms another mounting surface, the other mounting surface of the heat sink 10 can be used for rapid heat dissipation, thereby improving the heat dissipation efficiency. In this embodiment, the three single-phase switch tube groups 40 are arranged on the front mounting surface of the heat sink 10, but in other embodiments, the three single-phase switch tube groups 40 can also be arranged on the rear mounting surface of the heat sink 10. When arranged on the rear mounting surface, the switch tubes 20 and the input and output busbars 31 and 32 can be arranged according to the layout described in this embodiment.

[0211] The above will be further described below.

[0212] Specifically, referring to Figure 10a which shows the layout of the three single-phase switch tube groups 40 on the heat sink 10 and shows the corresponding directions. At the same time, referring to Figure 10b which shows the structure of the layout in side view and shows the corresponding directions. It should be noted that Figure 10a the directions shown are the directions when viewed from the front of the heat sink 10 towards the front mounting surface of the heat sink 10.

[0213] Referring to Figure 10a In this embodiment, the heat sink 10 includes a first sub-heat sink 10a, a second sub-heat sink 10b, and a third sub-heat sink 10c, which are arranged side by side in the left-right direction. In this embodiment, the heat sink 10 is a liquid-cooled heat sink.

[0214] In this embodiment, four switch modules constitute a single-phase switch tube group 40, and three single-phase switch tube groups 40 are respectively a first phase 41, a second phase 42 and a third phase 43. The first phase 41, the second phase 42 and the third phase 43 each include four switch modules arranged side by side along the left-right direction. The output end and the input end of each switch module in each switch module group are also arranged side by side. At this time, the input ends of the four switch modules collectively form the input end of the single-phase switch tube group 40, and the output ends of the four switch modules collectively form the output end of the single-phase switch tube group 40.

[0215] Referring to Figure 10a In each single-phase switch tube group 40, the arrangement direction of the four switch modules corresponds to the extension direction of the single-phase switch tube group 40, and also corresponds to the extension direction of the heat sink 10. In this embodiment, the single-phase switch tube group 40 can be considered to extend along the left-right direction, and each heat sink 10 also extends along the left-right direction. The above-mentioned three switch module groups arranged side by side along the left-right direction can be understood as that the three single-phase switch tube groups 40 are arranged in a straight line along the extension direction thereof, that is, the three heat sinks 10 are arranged in a straight line along the extension direction thereof.

[0216] Referring to Figure 10a Each single-phase switch tube group 40 is connected to the capacitor bus 50 through an input row 31, and is respectively connected to an output row 32. The input end and the output end of each phase of the three single-phase switch tube groups 40 are respectively located at the upper side and the lower side, so that an input row 31 can be respectively arranged along the upper edge of each heat sink 10. Corresponding to the single-phase switch tube groups 40 of the first phase 41, the second phase 42 and the third phase 43, there are respectively an input row first part 31a, an input row second part 31b and an input row third part 31c. At the same time, three output rows 32 can be respectively arranged along the lower edge of each heat sink 10. Corresponding to the single-phase switch tube groups 40 of the first phase 41, the second phase 42 and the third phase 43, there are respectively an output row first part 32a, an output row second part 32b and an output row third part 32c.

[0217] Referring to Figure 10b The capacitor bus 50 is located at the rear side of the heat sink 10, and the three single-phase switch tube groups 40 are mounted on the front mounting surface of the heat sink 10, and the extension direction of the input row 31 is parallel to the plate surface of the capacitor bus 50. In this way, in each single-phase switch tube group 40, the distance between each switch module and the capacitor bus 50 connected through the input row 31 is equal, and the length of the commutation loop of each switch module is also equal, so that the stray inductance is reduced, and the switching loss is also reduced.

[0218] Specifically, the input row first part 31a includes positive plates, neutral plates and negative plates, which are stacked and connected to corresponding plates of the capacitor busbar 50; the input row 31 also includes positive plates, neutral plates and negative plates, which are stacked and connected to corresponding plates of the capacitor busbar 50. Since the input ends of the three single-phase switch tube groups 40 are located on the upper edges of the respective heat sinks 10, three input rows 31 are needed to connect the capacitor busbar 50, but since the three single-phase switch tube groups 40 are arranged side by side in the left-right direction, the distance from each single-phase switch tube group 40 to the capacitor busbar 50 is equal, the current loop distance between the three single-phase switch tube groups 40 and the capacitor busbar 50 is consistent, and regardless of the current direction of the capacitor busbar 50, the time to reach each single-phase switch tube group 40 is also equal, thus having the best current loop balance.

[0219] The output row first part 32a, the output row second part 32b and the output row third part 32c are located below the front mounting surface of the heat sink 10, and are distributed in a concentrated manner, which can facilitate external output wiring.

[0220] The power assembly provided by the embodiment has the advantages that, compared with the embodiments 1 to 4, by arranging the single-phase switch tube groups 40 side by side, the current loop distance between the three single-phase switch tube groups 40 and the capacitor busbar 50 is always the same, thus improving the current loop balance from the capacitor busbar 50 to each single-phase switch tube group 40, and reducing the stray inductance.

[0221] Embodiment 8

[0222] The embodiment provides a power assembly, which mainly includes a heat sink 10, a capacitor module and a power module.

[0223] For the heat sink 10, the capacitor module and the power module, refer to the embodiment 1.

[0224] The layout of the switch tube 20 in the power assembly is described below.

[0225] As an optional implementation, the three single-phase switch tube groups 40 are divided into two parts to be respectively arranged on the two mounting surfaces of each heat sink 10, and the switch modules on each mounting surface are arranged side by side in the left-right direction. In the embodiment, the two mounting surfaces are parallel to the connecting part. Here, the mounting surfaces parallel to the connecting part can be regarded as that the flat heat sink 10 and the flat capacitor busbar 50 are arranged in a stacked manner. In this way, the volume of the heat sink 10 can be reduced, the space utilization of the heat sink 10 is further improved, and the overall volume of the power assembly is reduced.

[0226] The above is further described below.

[0227] Each single-phase switch tube group 40 is evenly divided into two parts, and the switch modules in each part are arranged side by side. The two parts are located on the front mounting surface and the rear mounting surface of the heat sink 10.

[0228] Referring to Figure 11a which shows the layout of the three single-phase switch tube groups 40 on the heat sink 10 and shows the corresponding directions. Meanwhile, referring to Figure 11b which shows the structure of the layout when viewed from the side and shows the corresponding directions. It should be noted that Figure 11a The directions shown are the directions when viewed from the front of the heat sink 10 towards the front mounting surface of the heat sink 10, where the part on the left side is the front side and the part on the right side is the rear side corresponding to the illustration of each single-phase switch tube group 40.

[0229] Referring to Figure 10a In this embodiment, the heat sink 10 includes a first sub-heat sink 10a, a second sub-heat sink 10b, and a third sub-heat sink 10c, which are arranged side by side in the left-right direction. In this embodiment, the heat sink 10 is a liquid-cooled heat sink.

[0230] Referring to Figure 11a In this embodiment, there are four switch modules in each single-phase switch tube group 40, and there are three single-phase switch tube groups 40, which are the first phase 41, the second phase 42, and the third phase 43. In each phase of the first phase 41, the second phase 42, and the third phase 43, the four switch modules are divided into two parts, and the two switch modules in each part are arranged side by side in the left-right direction. Therefore, the output terminals and input terminals of each switch module in each part are also arranged side by side. At this time, the input terminals of the two switch modules in each part form the input terminal of that part, and the output terminals of the two switch modules in each part form the output terminal of that part.

[0231] In this embodiment, the first phase 41 is divided into a first phase first part 41a and a first phase second part 41b, the second phase 42 is divided into a second phase first part 42a and a second phase second part 42b, and the third phase 43 is divided into a third phase first part 43a and a third phase second part 43b. Among them, the first part of the first phase 41, the second phase 42, and the third phase 43 are located on the front mounting surface of the respective heat sink 10, the second part of the first phase 41, the second phase 42, and the third phase 43 are located on the rear mounting surface of the respective heat sink 10, and the input terminals of the first part and the second part in each phase are located above and the output terminals are located below. When installed on the heat sink 10, the input terminals of the first phase 41, the second phase 42, and the third phase 43 correspond to the upper edges of the respective heat sink 10, and the output terminals correspond to the lower edges of the respective heat sink 10.

[0232] Meanwhile, each single-phase switch tube group 40 is connected with the capacitor busbar 50 through the input row 31, and is respectively connected with an output row 32. The input end and the output end of each phase of the three single-phase switch tube groups 40 are respectively located at the upper edge and the lower edge of the heat sink 10, so that an input row 31 can be respectively arranged along the upper edge of each heat sink 10, and the single-phase switch tube groups 40 corresponding to the first phase 41, the second phase 42 and the third phase 43 are respectively an input row first part 31a, an input row second part 31b and an input row third part 31c; meanwhile, three output rows 32 can be respectively arranged along the lower edge of each heat sink 10, and the single-phase switch tube groups 40 corresponding to the first phase 41, the second phase 42 and the third phase 43 are respectively an output row first part 32a, an output row second part 32b and an output row third part 32c.

[0233] In the embodiment, since each phase is divided into two parts located at the front mounting surface and the rear mounting surface of the heat sink 10, and the input row 31 and the output row 32 of each phase need to be connected with each switch module in the phase, the input row 31 can be arranged to bypass the upper edge of the heat sink 10 to connect the switch modules on the front and rear sides of the heat sink 10, and the output row 32 can be arranged to bypass the lower edge of the heat sink 10 to connect the switch modules on the front and rear sides of the heat sink 10.

[0234] With reference to Figure 11b , the capacitor busbar 50 is located at the rear side of the heat sink 10, the three single-phase switch tube groups 40 are arranged on the front mounting surface and the rear mounting surface of the respective heat sink 10, and the extension direction of the input row 31 is parallel to the plate surface of the capacitor busbar 50; in this way, in each single-phase switch tube group 40, each switch module is connected with the capacitor busbar 50 through the input row 31 at the same distance, the length of the commutation loop of each switch module is also the same, the stray inductance is reduced, and the switching loss is also reduced.

[0235] Specifically, the input row first part 31a includes a positive plate, a neutral plate and a negative plate, which are stacked and connected to the corresponding plates of the capacitor busbar 50; the input row 31 also includes a positive plate, a neutral plate and a negative plate, which are stacked and connected to the corresponding plates of the capacitor busbar 50. Since the input end of the three single-phase switch tube groups 40 is located at the upper edge of the respective heat sink 10, three input rows 31 are needed to connect the capacitor busbar 50, but since the three single-phase switch tube groups 40 are arranged side by side in the left-right direction, the distance between each single-phase switch tube group 40 and the capacitor busbar 50 is the same, the distance of the current loop between the three single-phase switch tube groups 40 and the capacitor busbar 50 is consistent, and regardless of the current direction of the capacitor busbar 50, the time of reaching each single-phase switch tube group 40 is also the same, so it has the best current loop balance.

[0236] The output row first portion 32a, the output row second portion 32b and the output row third portion 32c are all located below the front side mounting surface of the heat sink 10, and are distributed in a concentrated manner, which facilitates output of the wiring.

[0237] Compared with the power assembly of the embodiments 1 to 4, the power assembly of the embodiment 9 has the following advantages. The three single-phase switch tube groups 40 are arranged side by side, so that the distance of the current loop between the three single-phase switch tube groups 40 and the capacitor busbar 50 is always the same. Therefore, the current loop uniformity of the capacitor busbar 50 to each single-phase switch tube group 40 is improved, and the stray inductance is reduced. Compared with the embodiment 7, the switch tubes 20 are arranged on the front and back sides of the heat sink 10, so that the volume of the heat sink 10 is further reduced, the surface space utilization of the heat sink 10 is improved, and the overall volume of the power assembly is reduced.

[0238] Embodiment 9

[0239] The embodiment 9 provides a power assembly, which mainly comprises a heat sink 10, a capacitor module and a power module.

[0240] The heat sink 10, the capacitor module and the power module are the same as those of the embodiment 1.

[0241] The arrangement of the switch tubes 20 in the power assembly is described below.

[0242] As an optional embodiment, the three single-phase switch tube groups 40 are arranged on one heat sink 10. In this way, the overall volume of the power assembly can be effectively reduced, because the multiple heat sinks 10 as described in the background do not need to be arranged.

[0243] Further, in the power module, the single-phase switch tube groups are arranged side by side on the heat sink 10, and the arrangement direction of each single-phase switch tube group is parallel to the connecting portion. In each single-phase switch tube group, the arrangement direction of each switch module is consistent with the arrangement direction of each single-phase switch tube group. In each single-phase switch tube group 40, the arrangement direction of each switch module is parallel to the connecting portion of the capacitor busbar 50. In this way, the distance from each switch module to the capacitor busbar 50 in each single-phase switch tube group 40 can be ensured to be equal, so that the problem that the lengths of the commutation loops of the switch modules at different positions in each single-phase switch tube group 40 are inconsistent can be avoided.

[0244] Further, the three single-phase switch tube groups 40 are divided into two parts to be arranged on two mounting surfaces of the heat sink 10, and the switch modules on each mounting surface are arranged side by side along the left-right direction. In the embodiment, the two mounting surfaces are parallel to the connecting portion. The parallel mounting surfaces and the connecting portion can be regarded as that the flat heat sink 10 and the flat capacitor busbar 50 are arranged in a stacked manner. In this way, the volume of the heat sink 10 can be reduced, and the space utilization of the heat sink 10 is further improved, and the overall volume of the power assembly is reduced.

[0245] The above is further described as follows.

[0246] In each single-phase switch tube group 40, the output tubes 22 of the switch modules are arranged on the front mounting surface of the heat sink 10, and the input tubes 21 of the switch modules are arranged on the rear mounting surface of the heat sink 10. Corresponding to the arrangement, the above-mentioned "side-by-side arrangement" means that in each single-phase switch tube group 40, each output tube 22 is arranged side by side along the left-right direction, and each input tube 21 is also arranged side by side along the left-right direction.

[0247] Referring to Figure 12a , the arrangement of the three single-phase switch tube groups 40 on the heat sink 10 in the embodiment is shown, and the corresponding directions are shown. Meanwhile, referring to Figure 12b , the structure of the arrangement in the side view is shown, and the corresponding directions are shown. It should be noted that, Figure 12a the directions shown are the directions observed from the front of the heat sink 10 towards the front mounting surface of the heat sink 10, that is, Figure 12a the directions shown are only used to indicate the directions of the front view in Figure 12a .

[0248] Referring to Figure 12a , in the embodiment, four switch modules constitute a single-phase switch tube group 40, and three single-phase switch tube groups 40 are respectively the first phase 41, the second phase 42 and the third phase 43. Among them, the first phase 41, the second phase 42 and the third phase 43 are each divided into two parts, which are the first phase first part 41a, the first phase second part 41b, the second phase first part 42a, the second phase second part 42b, the third phase first part 43a and the third phase second part 43b. The first part of each phase corresponds to each input tube 21 in the single-phase switch tube group 40, and the second part of each phase corresponds to each output tube 22 in the single-phase switch tube group 40.

[0249] Referring to Figure 12aIn each single-phase switch tube group 40, the input ends of the four switch modules jointly form the input end of the single-phase switch tube group 40, and the output ends of the four switch modules jointly form the output end of the single-phase switch tube group 40. In each phase, the first part is located on the rear mounting surface of the heat sink 10, the second part is located on the front mounting surface of the heat sink 10, and the first part and the second part need to be connected by the connecting row 33. The connecting row 33 can be arranged to bypass the lower edge of the heat sink 10.

[0250] Referring to Figure 12a Each single-phase switch tube group 40 is connected with the capacitor bus 50 through the input row 31, and is respectively connected with an output row 32. The input end and the output end of each phase of the three single-phase switch tube groups 40 are located above, so that an input row 31 can be arranged along the upper edge of the heat sink 10, and the input row 31 simultaneously connects the three single-phase switch tube groups 40. Meanwhile, three output rows 32 can be arranged along the upper edge of the heat sink 10, corresponding to the first phase 41, the second phase 42 and the third phase 43, which are respectively the output row first part 32a, the output row second part 32b and the output row third part 32c.

[0251] Referring to Figure 12b The capacitor bus 50 is located on the rear side of the heat sink 10, and the three single-phase switch tube groups 40 are arranged on the front mounting surface and the rear mounting surface of the heat sink 10, and the extension direction of the input row 31 is parallel to the plate surface of the capacitor bus 50. In this way, in each single-phase switch tube group 40, each switch module is connected with the capacitor bus 50 through the input row 31 at equal distances, and the length of the commutation loop of each switch module is also equal, so that the stray inductance is reduced, and the switching loss is reduced.

[0252] Specifically, the input row first part 31a includes a positive plate, a neutral plate and a negative plate, which are stacked and connected to the corresponding plates of the capacitor bus 50. The input row 31 also includes a positive plate, a neutral plate and a negative plate, which are stacked and connected to the corresponding plates of the capacitor bus 50. Since the input ends of the three single-phase switch tube groups 40 are located on the upper edge of the heat sink 10, only one input row 31 is needed to connect the capacitor bus 50, so that the distance between each single-phase switch tube group 40 and the capacitor bus 50 is equal, the current loop distance between the three single-phase switch tube groups 40 and the capacitor bus 50 is consistent, and regardless of the current direction of the capacitor bus 50, the time to reach each single-phase switch tube group 40 is also equal, so that the current loop has the best balance.

[0253] The output row first part 32a, the output row second part 32b and the output row third part 32c are located above the front mounting surface of the heat sink 10, and are distributed in a concentrated manner, which can facilitate external output wiring.

[0254] Compared with the power assembly in Embodiment 1 to Embodiment 4, the power assembly in the present embodiment has the three single-phase switch tube groups 40 arranged in parallel, so that the current loop distance between the three single-phase switch tube groups 40 and the capacitor busbar 50 is always the same, thereby improving the current loop uniformity of the capacitor busbar 50 to the three single-phase switch tube groups 40 and reducing the stray inductance. Compared with Embodiment 7, the switch tubes 20 are arranged on the front and back sides of the heat sink 10, thereby further reducing the volume of the heat sink 10, improving the surface space utilization of the heat sink 10, and reducing the overall volume of the power assembly.

[0255] In addition, in Embodiment 3, the three single-phase switch tube groups 40 are arranged in parallel in the up-down direction, so that one single-phase switch tube group 40 is necessarily located in the middle position, which will cause the input row and the output row corresponding to the single-phase switch tube group 40 to occupy the surface space of the mounting surface of the heat sink 10, resulting in that the surface space utilization of the heat sink 10 is low and the overall volume of the power assembly cannot be compressed to the limit. In the present embodiment, the three single-phase switch tube groups 40 are arranged in parallel in the left-right direction, although the length dimension of the power assembly in the left-right direction is increased, the input row and the output row do not occupy the surface space of the mounting surface of the heat sink 10, so that the surface space utilization of the heat sink 10 is high and the overall volume of the heat sink 10 can be further reduced.

[0256] Further, the number of the heat sink 10 in the present embodiment is one, but in other embodiments, the number of the heat sink 10 can be three, and the three heat sinks 10 are arranged in the left-right direction, and each heat sink 10 corresponds to a complete single-phase switch tube group 40. The wiring mode of the single-phase switch tube group 40 can refer to the wiring mode of each single-phase switch tube group 40 in the present embodiment, but in the case of using three heat sinks 10, the connection row 33 in each single-phase switch tube group 40 can directly bypass the upper edge or the lower edge of the heat sink 10 where the single-phase switch tube group 40 is located. Using three heat sinks 10 can reduce the heat dissipation requirement of a single heat sink 10, thereby reducing the cost of the heat sink 10, and facilitating the wiring and maintenance of the single-phase switch tube group on each heat sink 10.

[0257] Embodiment 10

[0258] The present embodiment provides a power assembly, which mainly includes a heat sink 10, a capacitor module and a power module.

[0259] For the heat sink 10, the capacitor module and the power module, refer to Embodiment 1.

[0260] The arrangement of the switch tube 20 in the power assembly is described below.

[0261] As an optional embodiment, the surface of the heat sink 10 forms two mounting surfaces parallel to the connecting portion and used for mounting the single-phase switch tube groups, one of which faces the connecting portion and the other of which faces away from the connecting portion; the input tubes and the output tubes of each switch module are mounted on the same mounting surface, and the other input tubes are mounted on the other mounting surface. In this way, since multiple heat sinks 10 as in the background art are not required, the overall volume of the power assembly can be effectively reduced. In this embodiment, the two mounting surfaces are parallel to the connecting portion. Here, the mounting surfaces being parallel to the connecting portion can be considered that the flat heat sink 10 and the flat capacitor busbar 50 are arranged in a stacked manner.

[0262] Further, in each single-phase switch tube group 40, the arrangement direction of each switch module is parallel to the connecting portion of the capacitor busbar 50. In this way, the distance from each switch module to the capacitor busbar 50 in each single-phase switch tube group 40 can be ensured to be equal, thereby avoiding the problem that the lengths of the commutation loops of the switch modules at different positions in each single-phase switch tube group 40 are inconsistent.

[0263] Further, in each single-phase switch tube group, the input tubes or the output tubes on the same mounting surface are arranged side by side in the left-right direction in a corresponding manner, and the two input tubes and the output tube in each switch module are connected by the connecting busbar 33; the connecting busbar 33 penetrates the heat sink 10 to connect the input tubes and the output tubes on the respective mounting surfaces.

[0264] Further, each single-phase switch tube group is arranged side by side in the left-right direction on the heat sink 10. In each switch module, the input tubes and the output tubes mounted on the same mounting surface are arranged in the vertical direction, and the two input tubes correspond in position. In each switch module, the input ends of the two input tubes point in the same direction and are connected to the same input busbar. In each switch module, the input end of the input tube and the output end of the output tube mounted on the same mounting surface face away from each other.

[0265] The above will be further described below.

[0266] Specifically, refer to Figure 13a which shows the layout of the above-mentioned three single-phase switch tube groups 40 on the heat sink 10 and shows the corresponding directions. At the same time, refer to Figure 13b which shows the structure of the layout when viewed from the side and shows the corresponding directions. It should be noted that Figure 13a the directions shown are the directions when viewed from the front side of the heat sink 10 towards the front side mounting surface of the heat sink 10, that is, Figure 13a the directions shown are only used to indicate the directions of the front side view in Figure 13a .

[0267] Refer to Figure 13aIn this embodiment, four switch modules constitute a single-phase switch tube group 40, and three single-phase switch tube groups 40 are respectively a first phase 41, a second phase 42, and a third phase 43. Among them, the first phase 41, the second phase 42, and the third phase 43 are each divided into two parts, which are respectively a first phase first part 41a, a first phase second part 41b, a second phase first part 42a, a second phase second part 42b, a third phase first part 43a, and a third phase second part 43b. The first part of each phase corresponds to an input tube 21 and an output tube 22 of the single-phase switch tube group 40, and the second part of each phase corresponds to another input tube 21 of the single-phase switch tube group 40.

[0268] Referring to Figure 13a In each single-phase switch tube group 40, the input ends of the two input tubes 21 of the four switch modules together form the input end of the single-phase switch tube group 40, and the output ends of the four switch modules together form the output end of the single-phase switch tube group 40.

[0269] The first phase 41, the second phase 42, and the third phase 43 are arranged in a straight line along the left-right direction and distributed on the heat sink 10, wherein the first phase first part 41a is located on the front mounting surface of the heat sink 10, the first phase second part 41b is located on the rear mounting surface of the heat sink 10, the second phase first part 42a is located on the front mounting surface of the heat sink 10, the second phase second part 42b is located on the rear mounting surface of the heat sink 10, the third phase first part 43a is located on the front mounting surface of the heat sink 10, and the third phase second part 43b is located on the rear mounting surface of the heat sink 10. In this way, a mounting surface without a switch tube 20 can be left at a lower position of the rear mounting surface of the heat sink 10, which can improve the heat dissipation efficiency of the heat sink 10.

[0270] Among them, the input tube 21 of the first phase first part 41a is located at an upper position of the front mounting surface of the heat sink 10, and the output tube 22 of the first phase first part 41a is located at a lower position of the front mounting surface of the heat sink 10 and directly below the corresponding input tube 21; the input tube 21 of the first phase second part 41b is located at an upper position of the rear mounting surface of the heat sink 10, which corresponds to the position of the input tube 21 of the first phase first part 41a. Between the input tube 21 and the output tube 22 of the first phase first part 41a, a connection row 33 is connected; at the same time, between the output tube 22 of the first phase first part 41a and the input tube 21 of the first phase second part 41b, a connection row 33 is also connected, and since the output tube 22 of the first phase first part 41a and the input tube 21 of the first phase second part 41b are located on different mounting surfaces of the heat sink 10, an opening can be provided at the corresponding position of the heat sink 10 to pass the connection row 33 to connect the output tube 22 of the first phase first part 41a and the input tube 21 of the first phase second part 41b.

[0271] Referring to Figure 13a Each single-phase switch tube group 40 is connected with the capacitor busbar 50 through the input row 31, and each is connected with an output row 32. Since the input ends of the first phase 41, the second phase 42 and the third phase 43 are all located at the upper side, i.e. corresponding to the upper edge of the heat sink 10, one input row 31 is provided. Referring to Figure 13b Since in each phase, the two input tubes 21 are respectively located at the front side mounting surface and the rear side mounting surface of the heat sink 10, the structure of the input row 31 in this embodiment is different from that in the embodiments 1 to 9.

[0272] Referring to Figure 13b The capacitor busbar 50 is located at the rear side of the heat sink 10, and the extension direction of the input row 31 is parallel to the plate surface of the capacitor busbar 50; thus, in each single-phase switch tube group 40, each switch module is connected with the capacitor busbar 50 through the input row 31 at equal distance, and the length of the commutation loop of each switch module is also equal, the stray inductance is reduced, and the switching loss is reduced accordingly. As for the input row 31, it includes a positive plate, a neutral plate and a negative plate. Taking the first phase 41 as an example, in this embodiment, the input tubes 21 of the first phase first part 41a are connected with the positive plate and the neutral plate of the input row 31, and the input tubes 21 of the first phase second part 41b are connected with the negative plate and the neutral plate of the input row 31. At this time, the positive plate and the neutral plate of the input row 31 need to be wound to the front side of the heat sink 10 to be connected with the input tubes 21 of the first phase first part 41a, and the positive plate and the neutral plate of the input row 31 can be arranged in a stacked manner. The input tubes 21 of the first phase second part 41b can be directly connected with the negative plate and the neutral plate of the capacitor busbar 50. Here, the input tubes 21 of the first phase second part 41b can be connected with the negative plate and the neutral plate of the capacitor busbar 50 through a terminal post or a terminal row, which still belongs to the category of the input row 31, but the terminal post or the terminal row does not need to be arranged in a stacked manner with the positive plate and the neutral plate of the input row 31, thereby reducing the manufacturing cost of the input row 31. At the same time, under this layout configuration, the commutation loop of the power module is shortened, and the overall stray inductance is low. Even if the three plates of the input row 31 are not arranged in a stacked manner, the use requirement can still be met.

[0273] Similarly, the input row 31 of the second phase 42 and the third phase 43 also adopts the above-mentioned wiring mode, and the first phase 41, the second phase 42 and the third phase 43 share the same input row 31. Since the input ends of the three single-phase switch tube groups 40 are all located at the upper edge of the heat sink 10, only one input row 31 is needed to connect the capacitor busbar 50, so the distance between each single-phase switch tube group 40 and the capacitor busbar 50 is equal, the current loop distance between the three single-phase switch tube groups 40 and the capacitor busbar 50 is consistent, and regardless of the current direction of the capacitor busbar 50, the time to reach each single-phase switch tube group 40 is also equal, so it has the best current loop balance.

[0274] The output row first part 32a, the output row second part 32b and the output row third part 32c are all located below the front side mounting surface of the heat sink 10, and are distributed in a concentrated manner, so as to facilitate external output wiring.

[0275] The power assembly provided in the embodiment shortens the overall commutation circuit of the three-level topology by arranging the two input pipes 21 in the switch module on the front and rear sides of the heat sink 10, reduces the generation of stray inductance, and makes the single-phase switch tube groups 40 arranged side by side, so that the current loop distances between the three single-phase switch tube groups 40 and the capacitor bus 50 are consistent, thereby improving the current loop balance of the capacitor bus 50 to each single-phase switch tube group 40.

[0276] Meanwhile, compared with the embodiment 9, the power assembly provided in the embodiment also has the following advantages:

[0277] In the embodiment 9, the switch modules are arranged side by side in the left-right direction, which causes the power module to have an excessively long size in the left-right direction. In addition to the fact that this may cause certain difficulties in actual implementation and use, it also affects the heat sink 10. Since the heat sink 10 is a liquid cooling heat sink, it needs to be internally connected with cooling liquid. If the cooling liquid is connected to the left end or the right end of the heat sink 10, the other end of the heat sink 10 will be too far from the cooling liquid inlet, which will cause the heat sink 10 to have poor temperature uniformity at different positions. If the cooling liquid is connected to the upper end or the lower end of the heat sink 10, the pipeline of the cooling liquid will interfere with the input row 31 or the output row 32 of the power module.

[0278] In the embodiment, one input pipe and one output pipe in each switch module are arranged on the mounting surface in the vertical direction, and each switch module is arranged side by side in the left-right direction. This shortens the size of the power module in the left-right direction and increases the size of the power module in the up-down direction, so that the sizes of the power module in the left-right direction and the up-down direction are more balanced. In addition to the advantages in actual implementation and use, the heat sink 10 can be connected with the cooling liquid at the left end or the right end. Since the size in the left-right direction is shortened, the cooling liquid can be well released at each position of the heat sink 10, and the heat sink 10 has better overall temperature uniformity.

[0279] And, in the case of three switching tubes 20 in the switching module, the mounting surface at the rear side in the embodiment also leaves a free space at the lower position, and when actually designing the cooling liquid flow channel, the upper half of the heat sink 10 can be designed as a cooling liquid inlet flow channel, and the lower half can be designed as a cooling liquid return flow channel. The cooling liquid in the cooling liquid inlet flow channel has a lower temperature, which can improve the cooling efficiency of the input tube 21 with a higher temperature release. The cooling liquid in the cooling liquid return flow channel has a higher temperature, which has no effect on the cooling efficiency of the output tube 22 with a lower temperature release.

[0280] Embodiment 11

[0281] The embodiment is a further refinement of Embodiment 10. In the embodiment, each single-phase switching tube group 40 is composed of three switching modules in the same layout as in Embodiment 10.

[0282] The power assembly provided by the embodiment is further described below.

[0283] Referring to Figure 14 , which shows the structure of the heat sink 10, the switching tube 20, the input row 31, the output row 32, the capacitor busbar 50, and the connection row 33 in the power assembly provided by the embodiment.

[0284] Referring to Figure 15 and Figure 16 , in the power assembly provided by the embodiment, three switching modules form a single-phase switching tube group 40, and there are nine switching modules in total, forming three single-phase switching tube groups 40. Each single-phase switching tube group 40 outputs single-phase alternating current through the corresponding output row 32, and the three single-phase switching tube groups 40 cooperate to output three-phase alternating current. Among the three switching modules in each single-phase switching tube group 40, two input tubes 21 are located on the front side mounting surface and the rear side mounting surface of the heat sink 10 and are located at the upper position of the heat sink 10, and the output tube 22 is located on the front side mounting surface of the heat sink 10 and is located at the lower position of the heat sink 10. The input tube 21 located on the front side mounting surface of the heat sink 10 and the output tube 22 are connected by a connection row 33. The input tube 21 located on the rear side mounting surface of the heat sink 10 and the output tube 22 located on the front side mounting surface of the heat sink 10 are connected by another connection row 33, which passes through the opening provided on the heat sink 10 to pass through the heat sink 10 to the front side and the rear side.

[0285] Referring to Figure 17 , in the power assembly provided by the embodiment, the capacitor busbar 50 includes three plates, namely the capacitor busbar positive plate 51, the capacitor busbar neutral plate 52, and the capacitor busbar negative plate 53, which are arranged according to Figure 17The three polar plates are arranged from back to front as the positive polar plate 51, the neutral polar plate 52 and the negative polar plate 53 of the capacitor busbar, and the three polar plates are stacked, and the negative polar plate 53 is closest to the radiator 10.

[0286] The input row 31 also includes three parts, which are the positive polar plate 311, the neutral polar plate 312 and the input terminal 313. In the embodiment, the terminals of the input pipe 21 located on the front mounting surface of the radiator 10 are adapted to be connected with the positive polar plate 51 and the neutral polar plate 52 of the capacitor busbar, so one end of the positive polar plate 311 and the neutral polar plate 312 is connected to the positive polar plate 51 and the neutral polar plate 52 of the capacitor busbar, and the other end extends to the front of the radiator 10 and is connected with the input pipe 21 in each switch module. At the same time, the terminals of the input pipe 21 located on the rear mounting surface of the radiator 10 are adapted to be connected with the neutral polar plate 52 and the negative polar plate 53 of the capacitor busbar, and there is no radiator 10 between the capacitor busbar 50 and the input pipe 21, so the negative terminal of the input pipe 21 can be directly connected with the negative polar plate 53 of the capacitor busbar through the input terminal 313, and the neutral terminal of the input pipe 21 can be directly connected with the neutral polar plate 52 of the capacitor busbar.

[0287] The connection row 33 includes two parts, which are the first connection row 331 and the second connection row 332. The first connection row 331 connects the input pipe 21 and the output pipe 22 located on the front mounting surface of the radiator 10, and the second connection row 332 connects the input pipe 21 located on the rear mounting surface of the radiator 10 and the output pipe 22 located on the front mounting surface of the radiator 10.

[0288] In the embodiment, the radiator 10 is a liquid cooling radiator, which can effectively meet the heat dissipation requirements of the switch pipe 20.

[0289] Compared with the power assembly in the embodiments 1-9, the power assembly in the embodiment 10 can not only reduce the volume of the radiator 10, but also make the length and width of the radiator 10 in a proper range, which is beneficial to the practical application of the power assembly and the position arrangement of the input end and the output end of each switch pipe 20, and the power assembly has good current loop balance and low stray inductance.

[0290] Embodiment 12

[0291] The embodiment 12 is based on the embodiment 10, and the difference between the two is that in the embodiment 12:

[0292] In each switch module, the input tubes and output tubes installed on the same mounting surface are arranged in the up-down direction, and the two input tubes are staggered in position. In each switch module, the input ends of the two input tubes face away from each other. In each switch module, the input ends of the input tubes and the output ends of the output tubes installed on the same mounting surface face away from each other.

[0293] With reference to Figure 18a and Figure 18b One input tube 21 is installed on the upper part of the front side mounting surface of the radiator 10, and the input end is located on the upper side; the other input tube 21 is installed on the lower part of the rear side mounting surface of the radiator 10, and the input end is located on the lower side. Among them, the connection between the input tube 21 on the front side mounting surface and the input row 31 can refer to embodiment 10. The input tube 21 on the rear side mounting surface can be directly connected to the connection part of the capacitor female row 50 through the terminal post, and the specific connection can refer to embodiment 11.

[0294] Embodiment 13

[0295] With reference to Figure 19 This embodiment is based on embodiment 10, and the difference between the two is that in embodiment 13, the mounting surface formed by the radiator 10 has a certain inclination with the connection part, and among the two mounting surfaces formed, one mounting surface is upward relative to the capacitor female row 50, and the other mounting surface is downward relative to the capacitor female row 50.

[0296] Specifically, the mounting surface formed by the radiator 10 is perpendicular to the connection part of the capacitor female row 50, one of the mounting surfaces faces upward, and the other mounting surface faces downward. Compared with embodiment 10, with the content described in embodiment 11 as a reference, the input tube 21 can be directly connected to the capacitor female row through the terminal post, without the need to use a copper row or the like, and the wiring is more concise, and in the same switch module, the distance between the two input tubes 21 and the capacitor female row 50 is consistent, and compared with embodiment 10, the distance is shorter under the same conditions, which can better reduce the stray inductance.

[0297] It should be understood that this layout is also applicable to the above-mentioned embodiments 1-9, and for each embodiment, only adaptive improvement is required. However, in order to improve the actual use effect of this layout, it is preferred to improve the technical scheme in which the input row 31 is located at the edge of the radiator 10 and the three single-phase switch tube groups 40 are connected to the same input row 31. Due to the fact that the input row 31 is located at the edge, it can be directly connected to the capacitor female row 50, thereby reducing the length of the commutation loop, thereby achieving the effect of reducing the stray inductance.

[0298] Embodiment 14

[0299] The embodiment provides a converter, which comprises a converter shell, and the power assembly of any one of the embodiments 1 to 13 is arranged in the converter shell.

[0300] The heat sink 10 of the liquid-cooled converter is a liquid-cooled heat sink.

[0301] The description of the above specification and embodiments is used to explain the protection scope of the present application, but does not constitute the limitation of the protection scope of the present application. Through the inspiration of the present application or the above embodiments, the modification, equivalent replacement or other improvement of the embodiments of the present application or one part of the technical features can be obtained by the ordinary skilled in the art combining with the common knowledge, the ordinary technical knowledge and / or the prior art in the field, through the logical analysis, reasoning or limited test, and should be included in the protection scope of the present application.

Claims

1. A power assembly comprising: a capacitor module comprising DC capacitor banks and a capacitor busbar (50) connected to each other; the capacitor busbar (50) having a connection part; a power module comprising input buses (31), output buses (32) and three single-phase switch tube groups (40); each single-phase switch tube group (40) comprising a plurality of switch modules and being connected to the input buses (31) and the output buses (32); the input buses (31) being connected to the connection part; the output buses (32) being used for outputting electric energy; characterized in that it further comprises: a heat sink (10); all single-phase switch tube groups (40) in the power module are mounted on the heat sink (10), and the arrangement direction of each switch module in each single-phase switch tube group (40) is parallel to the connection part; in each single-phase switch tube group (40), each switch module is at a consistent distance from the capacitor busbar (50); the surface of the heat sink (10) for mounting each single-phase switch tube group (40) forms a mounting surface; all single-phase switch tube groups (40) are mounted on the same mounting surface of the heat sink (10), and the mounting surface is away from the connection part relative to the heat sink (10); the three single-phase switch tube groups (40) are a first phase (41), a second phase (42) and a third phase (43) respectively; the first phase (41) and the second phase (42) are arranged on the upper part and the lower part of the mounting surface respectively, and their output ends are oppositely arranged and located in the middle part of the mounting surface, and each of their output ends is connected to an output bus (32); the third phase (43) is divided into a third phase first part (43a) and a third phase second part (43b) according to the number of switch modules included, and the two are arranged on the upper part and the lower part of the mounting surface respectively, and their output ends are all located in the middle part of the mounting surface and connected to the same output bus (32).

2. A power pack as claimed in claim 1, characterised in that, The mounting surface is parallel to the connection part.

3. A power pack as claimed in claim 2, characterised in that, Each switch module in all single-phase switch tube groups (40) is divided into two parts arranged on the upper part and the lower part of the mounting surface, each part of switch modules is arranged side by side along the left-right direction, and the input ends of switch modules of the two parts are away from each other.

4. A power assembly comprising: a capacitor module comprising DC capacitor banks and a capacitor busbar (50) connected to each other; the capacitor busbar (50) having a connection part; a power module comprising input buses (31), output buses (32) and three single-phase switch tube groups (40); each single-phase switch tube group (40) comprising a plurality of switch modules and being connected to the input buses (31) and the output buses (32); the input buses (31) being connected to the connection part; the output buses (32) being used for outputting electric energy; characterized in that it further comprises: a heat sink (10); all single-phase switch tube groups (40) in the power module are mounted on the heat sink (10), and the arrangement direction of each switch module in each single-phase switch tube group (40) is parallel to the connection part; in each single-phase switch tube group (40), each switch module is at a consistent distance from the capacitor busbar (50); The mounting surface of the heat sink (10) for mounting each single-phase switch tube group (40) is formed, the heat sink (10) has two mounting surfaces facing away from each other, one of which faces the connecting part, and the other of which faces away from the connecting part; all single-phase switch tube groups (40) are divided into two parts and mounted on the two mounting surfaces of the heat sink (10) respectively; each switch module includes three switch tubes (20), which are divided into input tubes (21) and output tubes (22) according to types; the input tubes (21) and output tubes (22) of each switch module in each single-phase switch tube group (40) are correspondingly arranged side by side in the left-right direction; three single-phase switch tube groups (40) are respectively the first phase (41), the second phase (42) and the third phase (43); the first phase (41) and the second phase (42) are respectively mounted on the upper parts of the two mounting surfaces; the third phase (43) is divided into a third phase first part (43a) and a third phase second part (43b) according to the types of the switch tubes (20) included, and the third phase first part (43a) and the third phase second part (43b) are respectively mounted on the lower parts of the two mounting surfaces; the input ends of the first phase (41) and the second phase (42) are upwardly arranged, and the output ends of the first phase (41) and the second phase (42) are downwardly arranged; the input end and the output end of the third phase (43) are both downwardly arranged.

5. A power assembly comprising: a capacitor module comprising DC capacitor cells and a capacitor busbar (50) connected to each other; the capacitor busbar (50) has a connecting part; a power module comprising an input busbar (31), an output busbar (32) and three single-phase switch tube groups (40); each single-phase switch tube group (40) comprises a plurality of switch modules and is connected to the input busbar (31) and the output busbar (32); the input busbar (31) is connected to the connecting part; the output busbar (32) is used for outputting electric energy; characterized in that it further comprises: a heat sink (10); all single-phase switch tube groups (40) in the power module are mounted on the heat sink (10), and the arrangement direction of each switch module in each single-phase switch tube group (40) is parallel to the connecting part; in each single-phase switch tube group (40), the distance between each switch module and the capacitor busbar (50) is consistent. The mounting surface of the heat sink (10) is used to mount each single-phase switch tube group (40); the heat sink (10) has two mounting surfaces facing away from each other, one of which faces the connecting part, and the other of which faces away from the connecting part; all single-phase switch tube groups (40) are divided into two parts and mounted on the two mounting surfaces of the heat sink (10) respectively; each switch module includes three switch tubes (20), which are divided into input tubes (21) and output tubes (22) according to types; the input tubes (21) and output tubes (22) of each switch module in each single-phase switch tube group (40) are correspondingly arranged side by side in the left-right direction; the three single-phase switch tube groups (40) are respectively the first phase (41), the second phase (42) and the third phase (43); the first phase (41), the second phase (42) and the third phase (43) are sequentially distributed in the up-down direction and divided into the first phase first part (41a), the first phase second part (41b), the second phase first part (42a), the second phase second part (42b), the third phase first part (43a) and the third phase second part (43b) according to the types of included switch tubes (20); the first phase first part (41a), the second phase first part (42a) and the third phase first part (43a) include the input tubes (21) in the corresponding single-phase switch tube groups (40), and all are located on the mounting surface of the heat sink (10) facing the capacitor busbar (50); the first phase second part (41b), the second phase second part (42b) and the third phase second part (43b) include the output tubes (22) in the corresponding single-phase switch tube groups (40), and all are located on the mounting surface of the heat sink (10) facing away from the capacitor busbar (50).

6. A liquid-cooled current transformer characterized by, The power assembly comprises the heat sink (10) according to any one of claims 1-5, and the heat sink (10) is a liquid cooling heat sink.

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