CN117277828A

CN117277828A - Power assembly and liquid cooling converter

Info

Publication number: CN117277828A
Application number: CN202311115649.3A
Authority: CN
Inventors: 赵晓航; 魏礼贵; 倪泽联
Original assignee: Xiamen Kehua Digital Energy Tech Co Ltd
Current assignee: Xiamen Kehua Digital Energy Tech Co Ltd
Priority date: 2023-08-31
Filing date: 2023-08-31
Publication date: 2023-12-22

Abstract

The invention discloses a power component and a liquid cooling converter, wherein the power component comprises a capacitor module, a capacitor module and a power supply module, wherein the capacitor module comprises a direct-current capacitor pool and a capacitor busbar which are connected with each other; the power assembly comprises an input row, an output row and three single-phase switch tube groups, wherein each single-phase switch tube group comprises a plurality of switch modules and is connected to the input row and the output row; the input row is connected with the connecting part; the output row is used for outputting electric energy; and at least one heat sink; in the power module, each single-phase switch tube group is arranged on the radiator in parallel, and the arrangement direction of each single-phase switch tube group is parallel to the connection part of the capacitor busbar; 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. The power component can solve the problems of poor current loop balance and high stray inductance of the existing power component.

Description

Power assembly and liquid cooling converter

Technical Field

The invention relates to the field of power equipment, in particular to a power assembly and a liquid cooling converter.

Background

The converter is widely applied to the fields of power systems, rail transit, military industry, petroleum machinery, new energy automobiles, wind power generation, solar photovoltaic and the like, is connected between a battery system and a power grid, is used for realizing bidirectional conversion of electric energy, can control charging and discharging processes of a storage battery, performs alternating current-direct current conversion, and can directly supply power for alternating current loads under the condition of no power grid. Meanwhile, the NPC (Neutral Point Clamp) type or ANPC (Active Neutral Point Clamp) type three-level topology can utilize IGBT devices with low blocking voltage to improve the voltage of a direct current bus, further improve the alternating current output voltage and enlarge the power class of a system, and therefore the direct current bus is widely applied to converters.

As shown in fig. 1, the structure of a three-level topology power component in a conventional converter is shown, and the power component mainly comprises a capacitor busbar 01, a direct-current capacitor cell 02, an input row 03, a switching tube 04, an output row 05, a radiator 06 and a connection row 07.

The capacitor busbar 01 and the direct-current capacitor pool 02 are matched to form a capacitor module, the capacitor busbar 01 comprises a positive plate, a middle plate and a negative plate, and each capacitor device in the direct-current capacitor pool 02 is connected with the electrode plates with different polarities on the capacitor busbar 01 according to a three-level topological circuit structure.

Since the output of the power assembly is three-phase alternating current, it includes three sets of single-phase switching tube sets, each set including a plurality of switching modules, one heat sink 06, one input bank 03, one connection bank 07, and one output bank 05. The radiator 06 is an air-cooled radiator, one side of which forms a mounting surface for mounting the switch tube 04, and the other side of which is away from the mounting surface is provided with radiating fins.

With continued reference to fig. 2, each switching module includes three switching tubes 04, two input tubes 04a located above among the three switching tubes 04, and two output tubes 04b located below among the three switching tubes 04, where the two input tubes 04a and the output tubes 04b are connected by a connection row 07, and the switching modules are connected in parallel. The parallel connection can improve the output current capacity of a bridge arm of a single three-level topological structure, and the power assembly adopts a structure that four switch modules are connected in parallel. The group of input rows 03 is provided with positive plates, middle plates and negative plates corresponding to the capacitor busbar 01, and the positive plates, the middle plates and the negative plates are respectively connected with the corresponding plates on the capacitor busbar 01. The output row 05 is connected with the output ends of the four switch modules to provide single-phase alternating current output, and the output rows 05 of the three groups of switch modules jointly provide three-phase alternating current output.

With continued reference to fig. 3a and 3b, a group of switch modules is taken as an example, fig. 3a is a schematic circuit diagram of the three-level topology, and fig. 3b is a schematic connection diagram of the actual switch tube 04. In one switch module, two input tubes 04a and one output tube 04b are included, the terminals of the two input tubes 04a connected with 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 with the positive plate of the input row 03, the first neutral terminal 042 and the second neutral terminal 043 are connected with the neutral plate of the input row 03, and the negative terminal 044 is connected with the negative plate of the input row 03. After the lower end terminals of the two input pipes 04a are respectively connected, the lower end terminals are respectively connected with the lower output pipe 04b through a connecting row 07, and the lower end of the output pipe 04b is provided with a first output terminal 045 and a second output terminal 046 which are both connected with the output row 05. Wherein the input tube 04a may include T1, D1, T2, D2 in fig. 3 a; the input tube 04b may include T3, D3, T4, D4 in fig. 3 a; the output tubes may include T5, D5, T6, D6 in fig. 3 a.

In one switch module, the corresponding terminal of the input pipe 04a forms the input end of the switch module, and the corresponding terminal of the output pipe 04b forms the output end of the switch module. In a single-phase switch module, the input of each switch module forms the input of the single-phase switch module, and the output of each switch module forms the output of the single-phase switch module.

It is apparent that the power assembly of this structure has the following problems: the power assembly is large in size, so that the corresponding converter cannot be suitable for small-sized or special-demand electric cabinets; and, the power component reduces stray inductance generated during current conversion by adopting a copper bar lamination mode in a large quantity, so that the manufacturing cost of the power component is too high.

Disclosure of Invention

The present invention is directed to overcoming at least one of the drawbacks or problems in the prior art and providing a power assembly and a current transformer.

The present invention and its related embodiments adopt the following technical schemes but are not limited to the following schemes:

a first aspect and related embodiments relate to a power assembly comprising: the capacitor module comprises a direct-current capacitor pool and a capacitor busbar which are connected with each other; the capacitor busbar is provided with a connecting part; the power module comprises an input row, an output row 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 row and the output row; the input row is connected with the connecting part; the output row is used for outputting electric energy; the switching tubes included in each switching module are divided into an input tube and an output tube according to types; it also includes: at least one radiator, the surface of which forms two mounting surfaces facing away from each other and used for mounting each single-phase switch tube group; each switch module is divided into a part only comprising an input pipe and a part only comprising an output pipe according to the type of the switch pipe, and any mounting surface of the same radiator only comprises one part.

The second technical solution is based on the first technical solution and is a preferred embodiment of the first technical solution, wherein two mounting surfaces are parallel to the connecting portion, one of the mounting surfaces faces the connecting portion, and the other mounting surface faces away from the connecting portion.

The third technical solution is based on the second technical solution, and is a preferred embodiment of the second technical solution, wherein in each single-phase switching tube group, the input tubes and the output tubes of each switching module in each portion are correspondingly arranged in parallel along the left-right direction, and the input tubes and the output tubes in each switching module are connected through a connection row.

The fourth technical solution is based on the third technical solution, and is a preferred embodiment of the third technical solution, wherein in each switch module, a portion of the switch tube type that is an input tube is all installed on a mounting surface facing the capacitor busbar, and a portion of the switch tube type that is an output tube is all installed on a mounting surface facing away from the capacitor busbar.

A fifth technical solution is based on the fourth technical solution, and is a preferred embodiment of the fourth technical solution, wherein the number of the heat sinks is one, and three single-phase switch tube groups are sequentially arranged at the upper part, the middle part and the lower part of the heat sink along the up-down direction; the single-phase switch tube group is positioned at the upper part and/or the lower part of the radiator, and is connected with and arranged around the upper edge and/or the lower edge of the radiator; in the single-phase switch tube group positioned in the middle of the radiator, the connecting row penetrates through the radiator along the front-back direction.

A sixth technical solution is based on the fourth technical solution and is a preferred embodiment of the fourth technical solution, wherein the number of the heat sinks is one, and three single-phase switch tube groups are sequentially arranged at the upper part, the middle part and the lower part of the heat sink along the up-down direction; in the single-phase switch tube group positioned at the upper part, the middle part and/or the lower part of the radiator, the connecting row penetrates through the radiator along the front-back direction.

A seventh technical means is the heat sink according to the fourth technical means, wherein each single-phase switching tube group is arranged in parallel in the up-down direction; the number of the radiators is three, the three radiators are distributed along the up-down direction, and each radiator is correspondingly provided with a single-phase switch tube group; in each single-phase switch tube group, the connection is arranged around the upper edge or the lower edge of the radiator where the connection is arranged.

An eighth technical solution is based on the fourth technical solution, and is a preferred embodiment of the fourth technical solution, wherein the number of the heat sinks is one, three single-phase switch tube groups are arranged in parallel in the left-right direction on the heat sink, and input ends of the three single-phase switch tube groups are all connected with the same input row; in each single-phase switch tube group, the connection is arranged around the upper edge or the lower edge of the radiator where the connection is arranged.

A ninth technical means is the heat sink according to the fourth technical means, wherein each single-phase switching tube group is arranged in parallel in the left-right direction; the number of the radiators is three, the three radiators are distributed along the left-right direction, each radiator is correspondingly provided with one single-phase switch tube group, and the input ends of the three single-phase switch tube groups are connected with the same input row; in each single-phase switch tube group, the connection is arranged around the upper edge or the lower edge of the radiator where the connection is arranged.

A tenth aspect and related embodiments relate to a liquid-cooled converter, which includes the power assembly according to any one of the first to ninth aspects, wherein the radiator is a liquid-cooled radiator.

As can be seen from the above description of the present invention and the specific embodiments thereof, compared with the prior art, the technical solution of the present invention and the related embodiments thereof have the following beneficial effects due to the following technical means:

the inventor can be found through continuous observation, experiments and researches that the technical problem that the power component has larger volume is caused in the prior art, because the air-cooled radiator is adopted, only one side surface of the radiator can be used for installing the switching tube, the surface utilization rate of the radiator is low, and the arrangement area of the switching tube is large.

In the first technical scheme and the related embodiments, the adopted radiator is provided with two mounting surfaces, and the two mounting surfaces can be used for mounting the switch tube and radiating and cooling the switch tube, so that the surface utilization rate of the radiator is improved, and the arrangement area of the switch tube is reduced; meanwhile, each single-phase switch tube group is divided into two parts according to the type of the switch tube included in the switch module, namely one part comprises an input tube, the other part comprises an output tube, the switch tubes of the two parts are respectively installed on two installation surfaces of the radiator, so that each single-phase switch tube group cannot be staggered between the input row and the output row when being connected, connection of the switch module, installation of the input row and the output row are facilitated, and meanwhile, maintenance points are consistent and maintenance can be facilitated.

In the second technical solution and related embodiments, the two mounting surfaces are parallel to the connecting portion, so that the radiator and the capacitor busbar can be arranged in a stacked manner, the size of the power component in the thickness direction is reduced, the occupation of the power component in space is lower, and the practical use is facilitated.

In the third technical solution and related embodiments, in each single-phase switch tube group, each switch tube in two parts is arranged in parallel along the left-right direction correspondingly, that is, in one single-phase switch tube group, each input tube is arranged in parallel along the left-right direction, and each output tube is also arranged in parallel along the left-right direction, so that the input tubes can share the same input row extending along the left-right direction, and the output tubes can share the same output row extending along the left-right direction, thereby facilitating the connection of the switch modules and the installation of the input row and the output row, and simultaneously ensuring that the distance from the input end of each switch module to the connecting part of the capacitor busbar is consistent in each single-phase switch tube group, leading the current loop to have better balance, and simultaneously reducing stray inductance.

In the fourth technical scheme and related embodiments, the input tubes in all the switch modules are installed towards the capacitor busbar, the output tubes are installed away from the capacitor busbar, the distance from the input tubes in the switch modules to the connecting parts of the capacitor busbar can be reduced, the input rows and the output rows cannot be staggered or mutually covered after being installed, and the overall wiring is simpler and safer.

In the fifth and sixth technical solutions and related embodiments, three single-phase switching tube sets are sequentially arranged along the up-down direction, the size of the required radiator in the left-right direction is shortened, the shape of the radiator is more square, and the radiator and the power module can be conveniently installed in the converter; in addition, three single-phase switch tube groups are arranged on one radiator, wherein the connecting row of the single-phase switch tube group positioned in the middle can penetrate through the radiator to connect an input tube and an output tube on two mounting surfaces, the single-phase switch tube group positioned at the edge of the radiator can selectively enable the connecting row to bypass the edge of the radiator, and the connecting row can also selectively penetrate through the radiator, so that the connection of the input tube and the output tube in each switch module can be facilitated; in addition, the connecting row of the switch module in the single-phase switch tube group in the middle part does not need to bypass the edge of the radiator from one mounting surface to the other mounting surface, so that the current conversion loop of the single-phase switch tube group can be reduced, the overall stray inductance of the power assembly is reduced, and the wiring of the single-phase switch tube group is also facilitated.

In the seventh technical solution and related embodiments, three heat sinks are provided, and a single-phase switch tube group is installed on each heat sink, so that the heat dissipation pressure of the heat sink can be reduced, the requirements on the heat sink can be reduced, the preparation cost of the heat sink can be reduced, holes are not required for the heat sink, and the connection rows can directly bypass the edges of the heat sink, so that the preparation cost of the heat sink can be further reduced.

In the eighth technical solution and related embodiments, three single-phase switch tube groups are arranged in parallel along the left-right direction, the size of the required radiator in the up-down direction is shortened, the surface area utilization rate of the radiator can be improved, and the overall volume of the radiator is smaller; in addition, three single-phase switch tube groups are arranged on one radiator, and the single-phase switch tube groups are arranged in parallel along the left-right direction, so that each single-phase switch tube group can be connected with the same input row, the preparation and installation cost of the input row can be reduced, meanwhile, the distances between each single-phase switch tube group and the connecting part of the capacitor busbar are consistent, and the balance of a current loop can be improved.

In the ninth technical solution and related embodiments, three heat sinks are provided, and a single-phase switch tube set is installed on each heat sink, so that the heat dissipation pressure of the heat sink can be reduced, the requirements on the heat sink are reduced, and the manufacturing cost of the heat sink is reduced.

In a tenth technical aspect and related embodiments, a liquid-cooled converter is provided, wherein the adopted radiator is a liquid-cooled radiator, and the liquid-cooled converter has the above technical effects according to the adopted power component.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments below are briefly introduced, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram 1 of a prior art power converter module mentioned in the background art;

fig. 2 is a schematic structural diagram 2 of a prior art power converter module mentioned in the background art;

fig. 3a is a schematic circuit topology of a prior art converter power module mentioned in the introduction;

fig. 3b is a schematic structural diagram of the prior art power converter assembly mentioned in the background section;

FIG. 4a is a schematic structural diagram 1 of embodiment 1 of the present invention;

fig. 4b is a schematic structural view 2 of embodiment 1 of the present invention;

FIG. 5a is a schematic structural view 1 of embodiment 2 of the present invention;

FIG. 5b is a schematic diagram of the structure of embodiment 2 of the present invention;

FIG. 6a is a schematic structural view 1 of embodiment 3 of the present invention;

FIG. 6b is a schematic structural view 2 of embodiment 3 of the present invention;

fig. 7a is a schematic structural view 1 of embodiment 4 of the present invention;

FIG. 7b is a schematic diagram of the structure of embodiment 4 of the present invention;

FIG. 8a is a schematic diagram 1 of an embodiment 5 of the present invention;

FIG. 8b is a schematic diagram of the structure of embodiment 5 of the present invention;

fig. 9a is a schematic structural view 1 of embodiment 6 of the present invention;

fig. 9b is a schematic structural view 2 of embodiment 6 of the present invention;

FIG. 10a is a schematic view 1 of an embodiment 7 of the present invention;

FIG. 10b is a schematic diagram of the structure of embodiment 7 of the present invention;

FIG. 11a is a schematic structural view 1 of an embodiment 8 of the present invention;

FIG. 11b is a schematic diagram of the structure of embodiment 8 of the present invention;

fig. 12a is a schematic structural view 1 of embodiment 9 of the present invention;

fig. 12b is a schematic structural view of embodiment 9 of the present invention;

FIG. 13a is a schematic view of the structure of embodiment 10 of the present invention 1;

FIG. 13b is a schematic diagram of the structure of embodiment 10 of the present invention;

fig. 14 is a schematic structural view 1 of embodiment 11 of the present invention;

fig. 15 is a schematic structural view of embodiment 11 of the present invention 2;

FIG. 16 is a schematic view of the structure of embodiment 11 of the present invention;

FIG. 17 is a schematic view in section A-A of FIG. 15;

FIG. 18a is a schematic view of embodiment 12 of the present invention in structure 1;

FIG. 18b is a schematic diagram of embodiment 12 of the present invention;

fig. 19 is a schematic structural view of embodiment 13 of the present invention.

The main reference numerals illustrate:

in the description of fig. 1 to 3:

a capacitor busbar 01; a DC capacitor pool 02; an input row 03; a switching tube 04; an output row 05; a heat sink 06; a connection row 07;

an input tube 04a; an output pipe 04b;

a positive terminal 041; a first neutral terminal 042; a second neutral terminal 043; a negative terminal 044; a first output terminal 045; and a second output terminal 046.

In the description of fig. 4 to 19:

a heat sink 10; a switching tube 20; an input tube 21; an output pipe 22; an input row 31; an output row 32; a connection row 33; a single-phase switching tube group 40; a first phase 41; a second phase 42; a third phase 43; a capacitor busbar 50;

a first sub-radiator 10a; a second sub-radiator 10b; a third sub-radiator 10c;

an input row first portion 31a; an input row second portion 31b; an input row third section 31c;

an output row first portion 32a; an output row second portion 32b; an output row third section 32c;

a first phase first portion 41a; a first phase second portion 41b;

a second phase first portion 42a; a second phase second portion 42b;

A third phase first portion 43a; a third phase second portion 43b;

an input row positive plate 311; an input row line board 312; an input row post 313;

a connecting row first portion 331; a connecting row second portion 332;

a capacitor busbar positive plate 51; a capacitor busbar board 52; the capacitor busbar negative plate 53.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are preferred embodiments of the invention and should not be taken as excluding other embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without creative efforts, are within the protection scope of the present invention.

In the claims, specification and drawings hereof, unless explicitly defined otherwise, the terms "first," "second," or "third," etc. are used for distinguishing between different objects and not for describing a particular sequential order.

In the claims, specification and drawings of the present invention, unless explicitly defined otherwise, references to orientation or positional relationship such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. are based on the orientation and positional relationship shown in the drawings and are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element referred to must have a particular orientation or be constructed and operated in a particular orientation, nor should it be construed as limiting the particular scope of the invention.

In the claims, specification and drawings of the present invention, unless explicitly defined otherwise, the term "fixedly connected" or "fixedly connected" should be construed broadly, i.e. any connection between them without a displacement relationship or a relative rotation relationship, that is to say includes non-detachably fixedly connected, integrally connected and fixedly connected by other means or elements.

In the claims, specification and drawings of the present invention, the terms "comprising," having, "and variations thereof as used herein, are intended to be" including but not limited to.

As for the structure of the power component in the prior art described in the background section, the inventor researches and discovers that the reason why the power component of the structure is excessively large is that: the three groups of single-phase switch tube groups are respectively arranged on the three radiators 10, and the volume of the power assembly is increased under the influence of the radiators 10.

In addition, the inventor also discovers that the power component with the structure also has the problem of overhigh stray inductance, which is caused by the following reasons: the input line 03 is vertically arranged relative to the capacitor busbar 01, so that the distance between the switch module positioned on the outer side relative to the capacitor busbar 01 and the capacitor busbar 01 is too long, and further, a commutation loop is too long, and stray inductance is increased.

For this reason, the present specification provides the following examples to solve the above-described technical problems.

Example 1

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

The capacitor module comprises a capacitor busbar 50 and a direct-current capacitor pool which are connected with each other, wherein the capacitor busbar 50 is provided with a connecting part, and the connecting part is used 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, and three plates are stacked and have three input terminals, respectively. The power module can be connected to the capacitor busbar 50 to obtain electricity from the capacitor busbar 50, and the connection part of the power module and the capacitor busbar is the connection part, so that the position of the connection part on the capacitor busbar 50 is determined according to the connection position of the power module, and the connection part and the nearby part on the capacitor busbar 50, which are connected with the power module, can be considered as the connection part. It should be noted that the connection portion should be flat to facilitate connection of the power module. Meanwhile, the capacitor busbar 50 is also generally flat, and the connection portion is formed on the capacitor busbar 50.

The power module includes an input bank 31, an output bank 32, and three single-phase switching tube banks 40. The input line 31 is connected to the connection portion of the capacitor busbar 50 and to each single-phase switching tube group 40. Each single-phase switching tube group 40 is connected to an output bank 32 to output single-phase alternating current. Each single-phase switching tube group 40 includes a plurality of switching modules formed by combining the switching tubes 20. The switching tubes 20 are IGBT devices, three switching tubes 20 cooperate to form one switching module, and a plurality of switching modules are connected in parallel to form a single-phase switching tube group 40. Each single-phase switching tube group 40 is for outputting single-phase alternating current. The power module has three single-phase switch tube groups 40, and the three groups cooperate to output three-phase alternating current. In the present embodiment, each single-phase switching tube group 40 includes four switching modules, totaling twelve switching tubes 20.

The switching tube 20 in each switching module comprises an input tube 21 and an output tube 22, wherein the number of the input tubes 21 is two, and the number of the output tubes 22 is one. The input ends of the input pipes 21 form the input ends of the corresponding switch modules, and the output ends of the output pipes 22 form the output ends of the corresponding switch modules.

Referring to the background art, the input pipe 21 and the output pipe 22 are connected by a connection row 33, and the connection row 33 may be a copper bar. The input ends of the two input pipes 21 are connected with the connecting part of the capacitor busbar 50 through the input row 31, the output ends of the two input pipes 21 are connected with the input ends of the output pipes 22 through the connecting row 33, and the output ends of the output pipes 22 are connected with the output row 32. Wherein each output tube 22 in each single-phase switching tube set 40 is connected to the same output row 32.

The input and output bars 31, 32 are used to carry current in the form of hard-wired connections, which may be copper bars or studs. For example, in a single-phase switching tube group, some input tubes 21 are located close to the connection portion of the capacitor busbar 50, and the connection may be made directly by a terminal without copper bars.

The radiator 10 is used for installing the switching tube 20, and after the switching tube 20 is installed on the radiator 10, the radiator 10 can take away excessive heat to avoid overheat of the switching tube 20 during operation. Conventionally, the radiator 10 may be an air-cooled radiator as shown in the background art, and in this embodiment, an air-cooled radiator may also be used. At this time, the side surface of the air-cooled radiator 10 facing away from the radiator fins forms a mounting surface on which the switching tube 20 is mounted.

However, as a preferred embodiment, a liquid-cooled radiator is used in this example. The liquid-cooled radiator can provide higher heat radiation efficiency, and more switching tubes 20 can be stacked in one liquid-cooled radiator. The liquid-cooled radiator is generally a plate-like member, and both side surfaces thereof may form mounting surfaces.

The layout of the switching tube 20 in the above-described power module will be described below.

As an alternative embodiment, three single-phase switch tube groups 40 are each mounted on one radiator 10. In this way, since there is no need to provide a plurality of heat sinks 10 as described in the background art, the entire volume of the power module can be effectively reduced. It will be appreciated that in order to mount all three single-phase switch tube sets 40 on one radiator 10, the radiator 10 needs to have better heat dissipation performance, and the liquid-cooled radiator used in this embodiment may be a preferred choice.

Further, in each single-phase switching tube group 40, the arrangement direction of each switching module is parallel to the connection portion of the capacitor busbar 50. In this way, the distances from each switch module to the capacitor busbar 50 in each single-phase switch tube group 40 are ensured to be equal, and 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 not uniform is avoided.

Further, three single-phase switching tube groups 40 are each mounted on one mounting surface of the heat sink 10, and the mounting surface is parallel to the connection portion. The parallel connection of the mounting surface and the connection portion referred to herein is considered to be that the flat plate-like heat sink 10 and the flat plate-like capacitor busbar 50 are arranged in a stacked manner. When the installation surface is positioned at the front side of the radiator 10, the three unidirectional switch modules can be maintained conveniently, and when another installation surface is formed at the other side of the radiator 10, the other installation surface of the radiator 10 can be used for rapid heat dissipation, and the heat dissipation efficiency is improved. In the present embodiment, three single-phase switching tube groups 40 are mounted on the front side mounting surface of the radiator 10, but in other embodiments, three single-phase switching tube groups 40 may be mounted on the rear side mounting surface of the radiator 10, and when mounted on the rear side mounting surface, the individual switching tubes 20, the input row 31, and the output row 32 may be arranged in the layout manner described with reference to the present embodiment.

Further, each switch module in all the single-phase switch tube groups 40 is divided into two parts which are arranged on the upper part and the lower part of the mounting surface, each switch module in each part is arranged in parallel along the left-right direction, and the input ends of the switch modules of the two parts deviate from each other.

Further, 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 correspondingly arranged at the upper part and the lower part of the mounting surface, the output ends of the first phase 41 and the second phase 42 are oppositely arranged and positioned at the middle part of the mounting surface, and the output ends of the first phase and the second phase are respectively connected with an output row 32; the third phase 43 is equally divided into a third phase first part 43a and a third phase second part 43b according to the number of included switch modules, which are correspondingly arranged on the upper part and the lower part of the installation surface, and the output ends of the third phase 43 and the third phase second part are both positioned in the middle of the installation surface and are connected with the same output row 32. It should be noted that the "juxtaposed arrangement" referred to in the present specification means that the positions of the input pipes 21 of the respective switch modules correspond to each other in the left-right direction, and the positions of the output pipes 22 also correspond to each other in the left-right direction.

The above is further described below.

In this embodiment, of the two sides of the liquid-cooled radiator, the side facing away from the capacitor busbar 50 forms a mounting surface on which the power module is mounted, so that the power module is also disposed facing away from the connection portion of the capacitor busbar 50.

Referring to fig. 4a, there is shown the layout of the three single-phase switching tube groups 40 described above on the heat sink 10, and the corresponding directions. Meanwhile, reference is made to fig. 4b, which shows the configuration of the layout in side view and shows the corresponding direction. It should be noted that the direction shown in fig. 4a is a direction when viewed toward the front mounting surface of the heat sink 10, which is located in front of the heat sink 10.

In this embodiment, four switching modules form 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, wherein the first phase 41 and the second phase 42 include four switching modules arranged in parallel, and the third phase 43 is divided into a third-phase first portion 43a and a third-phase second portion 43b, and each portion includes two switching modules arranged in parallel.

In the first phase 41 and the second phase 42, four switch modules are arranged in parallel in the left-right direction, and thus the output end and the input end of each switch module are also arranged in parallel, and at this time, the input ends 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.

In 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, so that 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 form the input end of the part together, and the output ends of the two switch modules in each part form the output end of the part together.

And, the first phase 41 is arranged in parallel with each of the switch modules in the third phase first portion 43 a; the switch modules in the second phase 42 and the third phase second section 43b are also arranged side by side.

Referring to fig. 4a, the single-phase switching tube groups 40 of the first phase 41 and the second phase 42 are arranged vertically symmetrically, that is, the input end and the output end of the first phase 41 are located above and below, respectively, the input end and the output end of the second phase 42 are located below and above, respectively, the output ends of the two phases are opposite, and the input ends are deviated. When mounted on the heat sink 10, the input end of the first phase 41 corresponds to the upper edge of the heat sink 10, the output end corresponds to the middle of the heat sink 10, the input end of the second phase 42 corresponds to the lower edge of the heat sink 10, and the output end corresponds to the middle of the heat sink 10. The third phase first portion 43a and the third phase second portion 43b of the third phase 43 are also arranged symmetrically up and down, that is, the input end and the output end of the third phase first portion 43a are respectively located above and below, the input end and the output end of the third phase second portion 43b are respectively located below and above, the output ends of the third phase first portion and the third phase second portion are opposite, and the input ends of the third phase second portion and the third phase second portion are opposite. When the heat sink 10 is installed, that is, the input end of the third phase first portion 43a corresponds to the upper edge of the heat sink 10, the output end corresponds to the middle of the heat sink 10, the input end of the third phase second portion 43b corresponds to the lower edge of the heat sink 10, and the output end corresponds to the middle of the heat sink 10.

Referring to fig. 4a, each single-phase switching tube group 40 is connected to a capacitor busbar 50 through an input row 31, and is connected to an output row 32. Wherein the input ends of the single-phase switching tube group 40 of the first phase 41 and the third phase first portion 43a are located at the upper edge of the heat sink 10, so that an input row first portion 31a can be disposed along the upper edge of the heat sink 10; the input ends of the single-phase switching tube group 40 of the second phase 42 and the third phase second portion 43b are located at the lower edge of the heat sink 10, so that an input row of the second portions 31b can be provided along the lower edge of the heat sink 10; the output end of the first phase 41 is correspondingly provided with an output row first portion 32a, the output end of the second phase 42 is correspondingly provided with an output row second portion 32b, and the output ends of the third phase first portion 43a and the third phase second portion 43b are opposite, so that a common output row third portion 32c can be correspondingly provided.

Referring to fig. 4b, the capacitor busbar 50 is located at the rear side of the radiator 10, three single-phase switch tube groups 40 are installed on the front side installation surface of the radiator 10, and the extending direction of the input row 31 is parallel to the plate surface of the capacitor busbar 50; thus, in each single-phase switching tube group 40, the distance that each switching module is connected to the capacitor busbar 50 through the input row 31 is equal, so that the commutation loop length of each switching module is equal, and the distance is also shorter, the stray inductance is reduced, and the switching losses are reduced as a result, compared to the solutions of the background art.

Specifically, the first portion 31a of the input row includes a positive electrode plate, a middle electrode plate and a negative electrode plate, which are stacked and connected to the corresponding electrode plate of the capacitor busbar 50; the input row second portion 31b also includes a positive plate, a neutral plate and a negative plate, which are stacked with corresponding plates connected to the capacitor busbar 50. Since the input ends of the three single-phase switch tube groups 40 are respectively located at the upper edge and the lower edge of the radiator 10, the input-row first portion 31a and the input-row second portion 31b do not need to pass through the front-side mounting surface of the radiator 10 to the capacitor busbar 50, and the distances between the input-row first portion 31a and the input-row second portion 31b and the capacitor busbar 50 are equal, so that the direct-current-side current loop balance is better.

The first output row part 32a, the second output row part 32b and the third output row part 32c are all positioned in the middle of the front mounting surface of the radiator 10, and the positions are distributed intensively, so that external output wiring can be facilitated.

The power component provided by the embodiment reduces the volume of the radiator 10, further reduces the whole volume of the power component, and reduces the generation of stray inductance.

Example 2

The description of the heat sink 10, the capacitor module and the power module refers to embodiment 1.

As an alternative embodiment, three single-phase switching tube groups 40 are divided into two parts to be mounted on two mounting surfaces of the radiator 10, respectively. In this embodiment, the two sides of the liquid-cooled radiator used form mounting surfaces on which the power module is mounted. Therefore, the volume of the radiator 10 can be reduced, the space utilization rate of the radiator 10 is further improved, and the whole volume of the power assembly is reduced. And, both of the mounting surfaces are parallel to the connecting portion. The parallel connection of the mounting surface and the connection portion referred to herein is considered to be that the flat plate-like heat sink 10 and the flat plate-like capacitor busbar 50 are arranged in a stacked manner.

Further, in each single-phase switching tube group 40, the respective switching modules are arranged side by side in the left-right direction. Wherein, one complete single-phase switch tube group 40 is located on the front side installation surface of the radiator 10, the other complete single-phase switch tube group 40 is located on the rear side installation surface of the radiator 10, the output tube 22 in the switch module is located on the front side installation surface of the radiator 10 in the last single-phase switch tube group 40, and the input tube 21 in the switch module is located on the rear side installation surface of the radiator 10. It should be noted that in the last single-phase switching tube group 40, the respective output tubes 22 are arranged side by side in the left-right direction, and the respective input tubes 21 are also arranged side by side in the left-right direction.

The above is further described below.

Referring to fig. 5a, there is shown the layout of three single-phase switching tube groups 40 on the heat sink 10 in this embodiment, and the corresponding directions. Meanwhile, reference is made to fig. 5b, which shows the configuration of the layout in side view and shows the corresponding direction. It should be noted that the direction shown in fig. 5a is a direction when viewed toward the front mounting surface of the heat sink 10, which is in front of the heat sink 10, that is, the direction shown in fig. 5a is only used to indicate the direction of the front side view in fig. 5 a.

Referring to fig. 5a, in this embodiment, there are four switching modules constituting a single-phase switching tube group 40, and three single-phase switching 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 include four switch modules arranged in parallel, the third phase 43 is divided into a third phase first portion 43a and a third phase second portion 43b, the third phase first portion 43a includes all output pipes 22 of each switch module in the single-phase switch tube group 40, and the third phase second portion 43b includes all input pipes 21 of each switch module in the single-phase switch tube group 40.

Referring to fig. 5a, the single-phase switching tube group 40 of the first phase 41 is located on the front side mounting surface of the radiator 10, the single-phase switching tube group 40 of the second phase 42 is located on the rear side mounting surface of the radiator 10, the third phase first portion 43a is located on the front side mounting surface of the radiator 10, and the third phase second portion 43b is located on the rear side mounting surface of the radiator 10.

In the first phase 41 and the second phase 42, four switch modules are arranged in parallel in the left-right direction, and thus the output end and the input end of each switch module are also arranged in parallel, and at this time, the input ends 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. And, the input ends and the output ends of the single-phase switching tube group 40 of the first phase 41 and the second phase 42 are respectively located above and below. When mounted on the heat sink 10, i.e., the input ends of the first phase 41 and the second phase 42 correspond to the upper edge of the heat sink 10, the difference being only that one is on the front side of the heat sink 10 and one is on the rear side of the heat sink 10; meanwhile, the output ends of the first phase 41 and the second phase 42 correspond to the middle of the radiator 10.

The third phase first portion 43a corresponds to the output pipes 22 of each switch module in the single-phase switch pipe group 40 of the third phase 43, the four output pipes 22 are arranged in parallel along the left-right direction, the output ends of the four output pipes 22 are also arranged in parallel, and at this time, the output ends of the four output pipes 22 together form the output end of the single-phase switch pipe group 40; the third-phase second portion 43b corresponds to the input tubes 21 of each of the switch modules in the single-phase switch tube group 40 of the third phase 43, the eight input tubes 21 are arranged side by side in the left-right direction, 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, and at this time, the input ends of the eight input tubes 21 together form the input end of the single-phase switch tube group 40. In the third phase 43, the output and input ends of the single-phase switching tube group 40 are located below, and when mounted on the radiator 10, even though the output and input ends of the single-phase switching tube group 40 correspond to the upper edge of the radiator 10, the difference is that the output end thereof is located on the front side of the radiator 10 and the output end thereof is located on the rear side of the radiator 10.

Referring to fig. 5a, each single-phase switching tube group 40 is connected to a capacitor busbar 50 through an input row 31, and is connected to an output row 32. The input ends of the single-phase switch tube group 40 of the first phase 41 and the second phase 42 are located at the upper edge of the radiator 10, so that an input row first portion 31a and an input row second portion 31b can be arranged at the upper edge of the radiator 10, and the input row first portion 31a and the input row second portion 31b can be connected in parallel and then connected with the capacitor busbar 50; the input end of the third phase second portion 43b is located at the lower edge position of the heat sink 10, and thus the input row third portion 31c may be provided at the lower edge position of the heat sink 10.

Referring to fig. 5b, the output ends of the single-phase switching tube group 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 portion 32a and the second portion may be disposed at the middle of the heat sink 10, it should be noted that the output row first portion 32a is located at the front side of the heat sink 10, and may be directly connected to the external output, whereas the output row second portion 32b is located at the rear side of the heat sink 10, and if the external output connection is required, a sufficient space is required between the mounting surface of the rear side of the heat sink 10 and the capacitor busbar 50, which is disadvantageous for the length of the overall commutation loop of the power module, and thus an opening may be disposed at the middle of the heat sink 10, and the output row second portion 32b may be led out from the rear side of the heat sink 10 to the front side of the heat sink 10, thereby facilitating the external output connection of the output row second portion 32 b.

The output end of the third phase first portion 43a is located at the lower edge position of the heat sink 10, and the output row third portion 32c may be disposed at the lower edge position of the heat sink 10. In the third phase 43, the two input pipes 21 and output pipes 22 of each switch module are respectively located at two sides of the radiator 10, so that openings can be provided at corresponding positions of the radiator 10, and the input pipes 21 and output pipes 22 of each switch module are connected through the connection row 33. For ease of processing, since the position of the connection row 33 in the third phase 43 also corresponds to the middle of the radiator 10, only one opening may be provided in the middle of the radiator 10, which opening may be used for passing through both the connection row 33 and the output row second portion 32b.

Referring to fig. 5b, the capacitor busbar 50 is located at the rear side of the heat sink 10, and the extending direction of the input row 31 is parallel to the plate surface of the capacitor busbar 50; thus, in each single-phase switching tube group 40, the distance that each switching module is connected to the capacitor busbar 50 through the input row 31 is equal, the length of the commutating loop of each switching module is also equal, the stray inductance is reduced, and the switching loss is reduced.

Specifically, the first portion 31a of the input row includes a positive electrode plate, a middle electrode plate and a negative electrode plate, which are stacked and connected to the corresponding electrode plate of the capacitor busbar 50; input bank 31 also includes positive, neutral and negative plates, which are stacked with corresponding plates connected to capacitor busbar 50. Since the input ends of the three single-phase switching tube groups 40 are located at the upper and lower edges of the heat sink 10, respectively, the input row first, second and third portions 31a, to the capacitor busbar 50 do not need to pass through the front-side mounting surface of the heat sink 10. The distances from the second input row part 31b and the third input row part 31c to the capacitor busbar 50 are equal, and the balance of the direct current side current loop is better. Meanwhile, 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 laminated manner, stray inductance is reduced, and the use requirement can be met.

Compared with the embodiment 1, the power assembly provided in this embodiment further reduces the volume of the radiator 10 by arranging the switching tubes 20 on the front and rear sides of the radiator 10, improves the surface space utilization rate of the radiator 10, reduces the overall volume of the power assembly, and reduces the generation of stray inductance.

Example 3

In this embodiment, a liquid-cooled radiator is used. The liquid-cooled radiator can provide higher heat radiation efficiency, and more switching tubes 20 can be stacked in one liquid-cooled radiator. The liquid-cooled radiator is generally a plate-like member, and both side surfaces thereof may form mounting surfaces.

As an alternative embodiment, three single-phase switching tube groups 40 are arranged in parallel in the up-down direction.

In each single-phase switching tube group 40, the output tube 22 of the switching module is located on the front mounting surface of the radiator 10, and the input tube 21 of the switching module is located on the rear mounting surface of the radiator 10. In this embodiment, both of the mounting surfaces are parallel to the connecting portion. The parallel connection of the mounting surface and the connection portion referred to herein is considered to be that the flat plate-like heat sink 10 and the flat plate-like capacitor busbar 50 are arranged in a stacked manner.

Corresponding to this arrangement, the term "juxtaposed arrangement" in one single-phase switching tube group 40 means that in each single-phase switching tube group 40, the respective output tubes 22 are juxtaposed in the left-right direction, and the respective input tubes 21 are juxtaposed in the left-right direction. The above-mentioned "parallel arrangement" means that each single-phase switching tube group 40 is taken as a whole, and the arrangement direction of the respective switching modules in each single-phase switching tube group 40 is taken as the overall extending direction of the single-phase switching tube group 40, that is, each single-phase switching tube group 40 extends in the left-right direction, under the premise that three single-phase switching tube groups 40 are arranged in parallel from top to bottom on the radiator 10.

Further, in each single-phase switching tube group 40, both the output end and the input end thereof are located below the single-phase switching tube group 40.

The above is further described below.

Referring to fig. 6a, there is shown the layout of three single-phase switching tube groups 40 on the heat sink 10 in this embodiment, and the corresponding directions. Meanwhile, reference is made to fig. 6b, which shows the configuration of the layout in side view and shows the corresponding direction. It should be noted that the direction shown in fig. 6a is a direction when viewed toward the front mounting surface of the heat sink 10, which is in front of the heat sink 10, that is, the direction shown in fig. 6a is only used to indicate the direction of the front side view in fig. 6 a.

Referring to fig. 6a, in this embodiment, there are four switching modules constituting a single-phase switching tube group 40, and three single-phase switching tube groups 40 are a first phase 41, a second phase 42, and a third phase 43, respectively. The first phase 41, the second phase 42 and the third phase 43 are divided into two parts, namely 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 portion of each phase corresponds to a respective input pipe 21 in the single-phase switching tube group 40, and the second portion of each phase corresponds to a respective output pipe 22 in the single-phase switching tube group 40.

Referring to fig. 6a, in each single-phase switching tube group 40, the input ends of four switching modules collectively form the input end of the single-phase switching tube group 40, while the output ends of four switching modules collectively form the output end of the single-phase switching tube group 40.

Wherein the first phase 41 is located at an upper position of the radiator 10, the second phase 42 is located at a middle position of the radiator 10, and the second phase 42 is located at a lower position of the radiator 10. Correspondingly, the first phase first portion 41a is located on a rear mounting surface of the upper portion of the radiator 10, the first phase second portion 41b is located on a front mounting surface of the upper portion of the radiator 10, the first phase first portion 41a and the first phase second portion 41b are connected by a connection row 33, and the connection row 33 bypasses an upper edge of the radiator 10. The second-phase first portion 42a is located on the rear mounting surface of the radiator 10 at the middle position, the second-phase second portion 42b is located on the front mounting surface of the radiator 10 at the middle position, the second-phase first portion 42a and the second-phase second portion 42b are connected by the connection row 33, and here, reference is made to embodiment 2, and an opening is provided at the radiator 10 at the corresponding position, through which the connection row 33 can pass to connect the second-phase first portion 42a and the second-phase second portion 42b. The third-phase first portion 43a is located on a rear mounting surface of the lower portion of the radiator 10, the third-phase second portion 43b is located on a front mounting surface of the lower portion of the radiator 10, the third-phase first portion 43a and the third-phase second portion 43b are connected by a connection row 33, and similarly, an opening may be provided at a corresponding position of the radiator 10, through which the connection row 33 may connect the third-phase first portion 43a and the third-phase second portion 43b.

Referring to fig. 6a, each single-phase switching tube group 40 is connected to a capacitor busbar 50 through an input row 31, and is connected to an output row 32. Wherein the input end of the first phase 41 is connected to the input row first portion 31a, and the input row first portion 31a is located below the first phase first portion 41 a; the output of the first phase 41 is connected to the output row first portion 32a, the output row first portion 32a being located below the first phase second portion 41 b. The input end of the second phase 42 is connected to the input row second portion 31b, the input row second portion 31b being located below the second phase first portion 42 a; the output of the second phase 42 is connected to the output row second portion 32b, the output row second portion 32b being located below the second phase second portion 42 b. The input end of the third phase 43 is connected to the input row third portion 31c, and the input row third portion 31c is located below the third phase first portion 43 a; the output of the third phase 43 is connected to the output row third section 32c, the output row third section 32c being located below the third phase second section 43 b.

Referring to fig. 6b, the capacitor busbar 50 is located at the rear side of the heat sink 10, and the extending direction of the input row 31 is parallel to the plate surface of the capacitor busbar 50; thus, in each single-phase switching tube group 40, the distance that each switching module is connected to the capacitor busbar 50 through the input row 31 is equal, the length of the commutating loop of each switching module is also equal, the stray inductance is reduced, and the switching loss is reduced.

Specifically, the first input row portion 31a, the second input row portion 31b, and the third input row portion 31c each include a positive electrode plate, a middle electrode plate, and a negative electrode plate, which are stacked and connected to the corresponding electrode plates of the capacitor busbar 50. Since the input ends of the three single-phase switch tube groups 40 are all located at the rear side of the radiator 10, the first portion 31a, the second portion and the third portion of the input row 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, so that the balance of the current loop at the direct current side can be improved. Meanwhile, the output end of each single-phase switching tube group 40 is located at the front side of the radiator 10, so that the output row first portion 32a, the second portion, and the third portion are easily wired to the outside.

Further, in the present embodiment, the number of the heat sinks 10 is one, but in other embodiments, the number of the heat sinks 10 may be three, the three heat sinks 10 are arranged along the up-down direction, and a complete single-phase switch tube set 40 is correspondingly installed on each heat sink 10, and the wiring manner of the single-phase switch tube set 40 may refer to the wiring manner of each single-phase switch tube set 40 in the present embodiment, but in the case of using three heat sinks 10, the connection rows 33 in each single-phase switch tube set 40 may directly bypass the upper edge or the lower edge of the heat sink 10 where the connection rows are located. By adopting three radiators 10, the requirement on the heat dissipation capacity of a single radiator 10 is reduced, the cost of the radiator 10 can be reduced, and meanwhile, the wiring and maintenance of the single-phase switch tube group on each radiator 10 are facilitated.

Example 4

In the present embodiment, in each single-phase switching tube group 40, the output tube 22 of the switching module is located on the front-side mounting surface of the radiator 10, and the input tube 21 of the switching module is located on the rear-side mounting surface of the radiator 10. In this embodiment, both of the mounting surfaces are parallel to the connecting portion. The parallel connection of the mounting surface and the connection portion referred to herein is considered to be that the flat plate-like heat sink 10 and the flat plate-like capacitor busbar 50 are arranged in a stacked manner.

Corresponding to this arrangement, the above-mentioned "parallel arrangement" means that, in each single-phase switching tube group 40, the respective output tubes 22 are arranged side by side in the left-right direction, and the respective input tubes 21 are also arranged side by side in the left-right direction. The above-mentioned "parallel arrangement" means that each single-phase switching tube group 40 is taken as a whole, and the arrangement direction of the respective switching modules in each single-phase switching tube group 40 is taken as the overall extending direction of the single-phase switching tube group 40, that is, each single-phase switching tube group 40 extends in the left-right direction, under the premise that three single-phase switching tube groups 40 are arranged in parallel from top to bottom on the radiator 10.

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 terminal and the input terminal are located above the single-phase switching tube groups 40.

Referring to fig. 7a, there is shown the layout of three single-phase switching tube groups 40 on the heat sink 10 in this embodiment, and the corresponding directions. Meanwhile, reference is made to fig. 7b, which shows the configuration of the layout in side view and shows the corresponding direction. It should be noted that the direction shown in fig. 7a is a direction when viewed toward the front mounting surface of the heat sink 10, which is in front of the heat sink 10, that is, the direction shown in fig. 7a is only used to indicate the direction of the front side view in fig. 7 a.

Referring to fig. 7a, in this embodiment, there are four switching modules constituting a single-phase switching tube group 40, and three single-phase switching tube groups 40 are a first phase 41, a second phase 42, and a third phase 43, respectively. The first phase 41, the second phase 42 and the third phase 43 are divided into two parts, namely 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 portion of each phase corresponds to a respective input pipe 21 in the single-phase switching tube group 40, and the second portion of each phase corresponds to a respective output pipe 22 in the single-phase switching tube group 40.

Referring to fig. 7a, in each single-phase switching tube group 40, the input ends of four switching modules collectively form the input end of the single-phase switching tube group 40, while the output ends of four switching modules collectively form the output end of the single-phase switching tube group 40.

Wherein the first phase 41 is located at an upper position of the radiator 10, the second phase 42 is located at a middle position of the radiator 10, and the second phase 42 is located at a lower position of the radiator 10. Correspondingly, the first phase first portion 41a is located on a rear mounting surface of the upper portion of the radiator 10, the first phase second portion 41b is located on a front mounting surface of the upper portion of the radiator 10, the first phase first portion 41a and the first phase second portion 41b are connected by a connection row 33, and the connection row 33 bypasses an upper edge of the radiator 10. The second-phase first portion 42a is located on the rear mounting surface of the radiator 10 at the middle position, the second-phase second portion 42b is located on the front mounting surface of the radiator 10 at the middle position, the second-phase first portion 42a and the second-phase second portion 42b are connected by the connection row 33, and here, reference is made to embodiment 2, and an opening is provided at the radiator 10 at the corresponding position, through which the connection row 33 can pass to connect the second-phase first portion 42a and the second-phase second portion 42b. The third phase first portion 43a is located at a rear mounting surface of the lower portion of the radiator 10, the third phase second portion 43b is located at a front mounting surface of the lower portion of the radiator 10, the third phase first portion 43a and the third phase second portion 43b are connected by a connection row 33, and likewise, the third phase first portion 43a and the third phase second portion 43b are connected by a connection row 33, and the connection row 33 bypasses a lower edge of the radiator 10.

Referring to fig. 7a, each single-phase switching tube group 40 is connected to a capacitor busbar 50 through an input row 31, and is connected to an output row 32. Wherein the input end of the first phase 41 is connected to the input row first portion 31a, and the input row first portion 31a is located below the first phase first portion 41 a; the output of the first phase 41 is connected to the output row first portion 32a, the output row first portion 32a being located below the first phase second portion 41 b. The input end of the second phase 42 is connected to the input row second portion 31b, the input row second portion 31b being located below the second phase first portion 42 a; the output of the second phase 42 is connected to the output row second portion 32b, the output row second portion 32b being located below the second phase second portion 42 b. The input end of the third phase 43 is connected to the input row third portion 31c, and the input row third portion 31c is located above the third phase first portion 43 a; the output of the third phase 43 is connected to the output row third section 32c, the output row third section 32c being located above the third phase second section 43 b.

Referring to fig. 7b, the capacitor busbar 50 is located at the rear side of the heat sink 10, and the extending direction of the input row 31 is parallel to the plate surface of the capacitor busbar 50; thus, in each single-phase switching tube group 40, the distance that each switching module is connected to the capacitor busbar 50 through the input row 31 is equal, the length of the commutating loop of each switching module is also equal, the stray inductance is reduced, and the switching loss is reduced.

Specifically, the first portion 31a of the input row includes a positive electrode plate, a middle electrode plate and a negative electrode plate, which are stacked and connected to the corresponding electrode plate of the capacitor busbar 50; input bank 31 also includes positive, neutral and negative plates, which are stacked with corresponding plates connected to capacitor busbar 50. Since the input ends of the three single-phase switch tube groups 40 are all located at the rear side of the radiator 10, the first portion 31a, the second portion and the third portion of the input row 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, so that the balance of the current loop at the direct current side can be improved. Meanwhile, the output end of each single-phase switching tube group 40 is located at the front side of the radiator 10, so that the output row first portion 32a, the second portion, and the third portion are easily wired to the outside.

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

Example 5

Conventionally, the radiator 10 may be an air-cooled radiator as shown in the background art, and in this embodiment, an air-cooled radiator may also be used. At this time, the side surface of the air-cooled radiator 10 facing away from the radiator fins forms a mounting surface on which the switching tube 20 is mounted. However, as a preferred embodiment, a liquid-cooled radiator is used in this example. The liquid-cooled radiator can provide higher heat radiation efficiency, and more switching tubes 20 can be stacked in one liquid-cooled radiator. The liquid-cooled radiator is generally a plate-like member, and both side surfaces thereof may form mounting surfaces.

As an alternative embodiment, in the power module, each single-phase switching tube group is arranged in parallel to the radiator 10, and the arrangement direction of each single-phase switching tube group is parallel to the connection 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 switching tube group 40, the arrangement direction of each switching module is parallel to the connection portion of the capacitor busbar 50. In this way, the distances from each switch module to the capacitor busbar 50 in each single-phase switch tube group 40 are ensured to be equal, and 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 not uniform is avoided.

Further, three single-phase switching tube groups 40 are each mounted on one mounting surface of the heat sink 10. In this embodiment, the mounting surface is parallel to the connection portion. The parallel connection of the mounting surface and the connection portion referred to herein is considered to be that the flat plate-like heat sink 10 and the flat plate-like capacitor busbar 50 are arranged in a stacked manner. When the installation surface is positioned at the front side of the radiator 10, the three unidirectional switch modules can be maintained conveniently, and when another installation surface is formed at the other side of the radiator 10, the other installation surface of the radiator 10 can be used for rapid heat dissipation, and the heat dissipation efficiency is improved. In the present embodiment, three single-phase switching tube groups 40 are mounted on the front side mounting surface of the radiator 10, but in other embodiments, three single-phase switching tube groups 40 may be mounted on the rear side mounting surface of the radiator 10, and when mounted on the rear side mounting surface, the individual switching tubes 20, the input row 31, and the output row 32 may be arranged in the layout manner described with reference to the present embodiment.

The above is further described below.

Specifically, referring to fig. 8a, the layout of the three single-phase switching tube groups 40 on the heat sink 10 is shown, with the corresponding directions shown. Meanwhile, reference is made to fig. 8b, which shows the configuration of the layout in side view and shows the corresponding direction. It should be noted that the direction shown in fig. 8a is a direction when viewed toward the front side surface of the heat sink 10, which is located in front of the heat sink 10.

In this embodiment, four switching modules form a single-phase switching tube group 40, and three single-phase switching tube groups 40 are a first phase 41, a second phase 42, and a third phase 43, respectively, wherein each of the first phase 41, the second phase 42, and the third phase 43 includes four switching modules arranged side by side in the left-right direction. In each switch module, the output end and the input end of each switch module are also arranged in parallel, 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.

Referring to fig. 8a, each single-phase switching tube group 40 is connected to a capacitor busbar 50 through an input row 31, and is connected to an output row 32. The input and output ends of each phase of the three single-phase switching tube groups 40 are located above and below, respectively, so that an input row 31 may be provided along the upper edge of the heat sink 10, the input row 31 being simultaneously connected to the three single-phase switching tube groups 40, while three output rows 32 may be provided along the lower edge of the heat sink 10, corresponding to the first phase 41, the second phase 42, and the third phase 43, respectively, the output row first portion 32a, the output row second portion 32b, and the output row third portion 32c.

Referring to fig. 8b, the capacitor busbar 50 is located at the rear side of the radiator 10, three single-phase switch tube groups 40 are installed on the front side installation surface of the radiator 10, and the extending direction of the input row 31 is parallel to the plate surface of the capacitor busbar 50; thus, in each single-phase switching tube group 40, the distance that each switching module is connected to the capacitor busbar 50 through the input row 31 is equal, the length of the commutating loop of each switching module is also equal, the stray inductance is reduced, and the switching loss is reduced.

Specifically, the first portion 31a of the input row includes a positive electrode plate, a middle electrode plate and a negative electrode plate, which are stacked and connected to the corresponding electrode plate of the capacitor busbar 50; input bank 31 also includes positive, neutral and negative plates, which are stacked with corresponding plates connected to capacitor busbar 50. Since the input ends of the three single-phase switch tube groups 40 are all located at the upper edge of the radiator 10, only one input row 31 is needed to connect the capacitor busbar 50, so that the distances between each single-phase switch tube group 40 and the capacitor busbar 50 are equal, the current loop distances between the three single-phase switch tube groups 40 and the capacitor busbar 50 are consistent, and the time when the current reaches each single-phase switch tube group 40 is equal no matter the current direction of the capacitor busbar 50, so that the current loop balance is the best.

The first output row part 32a, the second output row part 32b and the third output row part 32c are all positioned below the front mounting surface of the radiator 10, and are distributed in a concentrated manner, so that external output wiring can be facilitated.

Compared with embodiments 1 to 4, the power module provided in this embodiment has the advantages that the current loop distances between the three single-phase switch tube groups 40 and the capacitor busbar 50 are consistent by arranging the single-phase switch tube groups 40 in parallel, so that the current loop balance from the capacitor busbar 50 to each single-phase switch tube group 40 is improved, and the stray inductance is reduced.

Example 6

As an alternative embodiment, three single-phase switching tube groups 40 are divided into two parts to be respectively mounted on two mounting surfaces of the heat sink 10, and the switching modules on each mounting surface are arranged side by side in the left-right direction. In this embodiment, both of the mounting surfaces are parallel to the connecting portion. The parallel connection of the mounting surface and the connection portion referred to herein is considered to be that the flat plate-like heat sink 10 and the flat plate-like capacitor busbar 50 are arranged in a stacked manner. Therefore, the volume of the radiator 10 can be reduced, the space utilization rate of the radiator 10 is further improved, and the whole volume of the power assembly is reduced.

The above is further described below.

Wherein, one complete single-phase switch tube group 40 is located on the front side installation surface of the radiator 10, the other complete single-phase switch tube group 40 is located on the rear side installation surface of the radiator 10, and in the last single-phase switch tube group 40, each switch module is divided into two parts in average, each switch module in each part is arranged in parallel, and the two parts are respectively located on the front side installation surface and the rear side installation surface of the radiator 10.

Referring to fig. 9a, there is shown the layout of three single-phase switching tube groups 40 on the heat sink 10 in this embodiment, and the corresponding directions. Meanwhile, reference is made to fig. 9b, which shows the configuration of the layout in side view and shows the corresponding direction. It should be noted that the direction shown in fig. 9a is a direction when viewed toward the front mounting surface of the heat sink 10, which is in front of the heat sink 10, that is, the direction shown in fig. 9a is only used to indicate the direction of the front side view in fig. 9 a.

Referring to fig. 9a, in this embodiment, there are four switching modules constituting a single-phase switching tube group 40, and three single-phase switching 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 include four switch modules arranged in parallel, and the third phase 43 is divided into a first portion 43a of the third phase and a second portion 43b of the third phase, where each portion includes two switch modules arranged in parallel. Wherein the first phase 41 and the third phase first portion 43a are located on a front side mounting surface of the heat sink 10, and the second phase 42 and the third phase second portion 43b are located on a rear side mounting surface of the heat sink 10. On the front-side mounting surface of the radiator 10, a first phase 41 and a third phase first portion 43a are arranged side by side in the left-right direction; on the rear mounting surface of the radiator 10, the second phase 42 and the third phase second portion 43b are arranged side by side in the left-right direction.

Referring to fig. 9a, the input ends of the first phase 41, the second phase 42, and the third phase 43 are all located above. When mounted on the heat sink 10, 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. 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. Thus, an input row 31 may be provided along the upper edge of the radiator 10, the input row 31 connecting the input ends of the first phase 41, the second phase 42 and the third phase 43 simultaneously; and three output rows 32, respectively an output row first portion 32a, an output row second portion 32b, and an output row third portion 32c, may be disposed along the lower edge of the heat sink 10, and are connected to the output ends of the first phase 41, the second phase 42, and the third phase 43, respectively.

In the case of the output third portion 32c, since the third phase 43 is divided into the third phase first portion 43a and the third phase second portion 43b, and the third phase first portion 43a and the third phase second portion 43b are respectively located on the front side mounting surface and the rear side mounting surface of the radiator 10, and the output third portion 32c needs to be connected to the output ends of the third phase first portion 43a and the third phase second portion 43b at the same time, the output third portion 32c can bypass the right edge of the radiator 10, and the output third portion 32c can be connected to the output ends of the third phase first portion 43a and the third phase second portion 43b at the same time.

Referring to fig. 9b, the capacitor busbar 50 is located at the rear side of the radiator 10, three single-phase switch tube groups 40 are installed on the front side installation surface and the rear side installation surface of the radiator 10, and the extending direction of the input row 31 is parallel to the plate surface of the capacitor busbar 50; thus, in each single-phase switching tube group 40, the distance that each switching module is connected to the capacitor busbar 50 through the input row 31 is equal, the length of the commutating loop of each switching module is also equal, the stray inductance is reduced, and the switching loss is reduced.

Referring to fig. 9b, since the input ends of the three single-phase switch tube groups 40 are all located at the upper edge of the radiator 10, only one input row 31 is needed to connect the capacitor busbar 50, so that the distances between each single-phase switch tube group 40 and the capacitor busbar 50 are equal, the current loop distances between the three single-phase switch tube groups 40 and the capacitor busbar 50 are identical, and the time to reach each single-phase switch tube group 40 is also equal regardless of the current direction of the capacitor busbar 50, so that the best current loop balance is achieved. Meanwhile, referring to fig. 9b, the input end of the second phase 42 may be connected in parallel with the input line 31 connected to the input end of the first phase 41 and then connected to the capacitor busbar 50, so as to reduce the total length of the input line 31, reduce the manufacturing cost, and reduce the stray inductance.

The first output row portion 32a, the second output row portion 32b and the third output row portion 32c are all located at the lower edge of the radiator 10, and are distributed in a concentrated manner, so that external output wiring can be facilitated.

Compared with embodiments 1 to 4, the power module provided in this embodiment has the advantages that the current loop distances between the three single-phase switch modules and the capacitor busbar 50 are consistent by arranging the single-phase switch tube groups 40 in parallel, so that the current loop balance from the capacitor busbar 50 to each single-phase switch tube group 40 is improved, and the stray inductance is reduced. Meanwhile, compared with embodiment 5, by arranging the switching tubes 20 on the front and rear sides of the radiator 10, the volume of the radiator 10 is further reduced, the surface space utilization rate of the radiator 10 is improved, and the overall volume of the power assembly is also reduced.

Example 7

The description of the capacitor module and the power module refers to embodiment 1, and only the differences between them will be described below.

As an alternative embodiment, three single-phase switching tube groups 40 are mounted on the three heat sinks 10, respectively. In this way, the heat dissipation capacity requirements for each heat sink 10 are reduced, thereby reducing the cost of the heat sink 10.

Further, in the power module, each single-phase switch tube group is arranged in parallel on the radiator 10, and the arrangement direction of each single-phase switch tube group is parallel to the connection 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 switching tube group 40, the arrangement direction of each switching module is parallel to the connection portion of the capacitor busbar 50. In this way, the distances from each switch module to the capacitor busbar 50 in each single-phase switch tube group 40 are ensured to be equal, and 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 not uniform is avoided.

The above is further described below.

Specifically, referring to fig. 10a, the layout of the three single-phase switching tube groups 40 on the heat sink 10 is shown, with the corresponding directions shown. Meanwhile, referring to fig. 10b, the configuration of the layout in side view is shown, and the corresponding direction is shown. It should be noted that the direction shown in fig. 10a is a direction when viewed toward the front mounting surface of the heat sink 10, which is located in front of the heat sink 10.

Referring to fig. 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.

Referring to fig. 10a, in each single-phase switching tube group 40, the arrangement direction of four switching modules corresponds to the extending direction of the single-phase switching tube group 40, and simultaneously corresponds to the extending direction of the heat sink 10. In the present embodiment, the single-phase switching tube group 40 can be considered to extend in the left-right direction while each radiator 10 also extends in the left-right direction. The above three concern switch modules are arranged side by side in the left-right direction, and it is understood that the three single-phase switch tube groups 40 are arranged in a row in the extending direction thereof, that is, the three heat sinks 10 are arranged in a row in the extending direction thereof.

Referring to fig. 10a, each single-phase switching tube group 40 is connected to a capacitor busbar 50 through an input row 31, and is connected to an output row 32. The input and output ends of each phase of the three single-phase switching tube groups 40 are respectively located above and below, so that an input row 31 can be respectively provided along the upper edge of each radiator 10, the single-phase switching tube groups 40 corresponding to the first phase 41, the second phase 42 and the third phase 43 being respectively an input row first portion 31a, an input row second portion 31b and an input row third portion 31c; while three output rows 32, corresponding to the single-phase switching tube groups 40 of the first phase 41, the second phase 42, and the third phase 43, respectively, may be provided along the lower edge of each heat sink 10, respectively, an output row first portion 32a, an output row second portion 32b, and an output row third portion 32c.

Referring to fig. 10b, the capacitor busbar 50 is located at the rear side of the radiator 10, three single-phase switch tube groups 40 are installed on the front side installation surface of the radiator 10, and the extending direction of the input row 31 is parallel to the plate surface of the capacitor busbar 50; thus, in each single-phase switching tube group 40, the distance that each switching module is connected to the capacitor busbar 50 through the input row 31 is equal, the length of the commutating loop of each switching module is also equal, the stray inductance is reduced, and the switching loss is reduced.

Specifically, the first portion 31a of the input row includes a positive electrode plate, a middle electrode plate and a negative electrode plate, which are stacked and connected to the corresponding electrode plate of the capacitor busbar 50; input bank 31 also includes positive, neutral and negative plates, which are stacked with corresponding plates connected to capacitor busbar 50. Since the input ends of the three single-phase switch tube groups 40 are all located at the upper edges of the respective heat sinks 10, three input rows 31 are required to be connected to 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 distances between each single-phase switch tube group 40 and the capacitor busbar 50 are equal, the current loop distances between the three single-phase switch tube groups 40 and the capacitor busbar 50 are identical, and the time to reach each single-phase switch tube group 40 is also equal regardless of the current direction of the capacitor busbar 50, so that the capacitor busbar has the best current loop balance.

Compared with embodiments 1 to 4, the power module provided in this embodiment has the advantages that the single-phase switch tube groups 40 are 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, and therefore, the current loop balance from the capacitor busbar 50 to each single-phase switch tube group 40 is improved, and meanwhile, the stray inductance is reduced.

Example 8

As an alternative embodiment, three single-phase switching tube groups 40 are divided into two parts to be respectively mounted on two mounting surfaces of the respective heat sinks 10, and the switching modules on each of the mounting surfaces are arranged side by side in the left-right direction. In this embodiment, both of the mounting surfaces are parallel to the connecting portion. The parallel connection of the mounting surface and the connection portion referred to herein is considered to be that the flat plate-like heat sink 10 and the flat plate-like capacitor busbar 50 are arranged in a stacked manner. Therefore, the volume of the radiator 10 can be reduced, the space utilization rate of the radiator 10 is further improved, and the whole volume of the power assembly is reduced.

The above is further described below.

Wherein each single-phase switching tube group 40 is equally divided into two parts, and the respective switching modules in each part are arranged in parallel, the two parts being located on the front side mounting surface and the rear side mounting surface of the radiator 10, respectively.

Referring to fig. 11a, there is shown the layout of three single-phase switching tube groups 40 on the radiator 10 in the present embodiment, and the corresponding directions. Meanwhile, referring to fig. 11b, a configuration of the layout in side view is shown, and the corresponding directions are shown. It should be noted that the direction shown in fig. 11a is a direction when viewed toward the front mounting surface of the heat sink 10, where the portion on the left side is the front side and the portion on the right side is the rear side, corresponding to the illustration of each single-phase switching tube group 40.

Referring to fig. 11a, in this embodiment, there are four switching modules constituting a single-phase switching tube group 40, and three single-phase switching tube groups 40 are a first phase 41, a second phase 42, and a third phase 43, respectively. In each 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 in parallel in the left-right direction, so that the output end and the input end of each switch module in each part are also arranged in parallel, at this time, the input ends of the two switch modules in each part form the input end of the part together, and the output ends of the two switch modules in each part form the output end of the part together.

In this embodiment, the first phase 41 is divided into a first phase first portion 41a and a first phase second portion 41b, the second phase 42 is divided into a second phase first portion 42a and a second phase second portion 42b, and the third phase 43 is divided into a third phase first portion 43a and a third phase second portion 43b. Wherein, the first portions of the first phase 41, the second phase 42 and the third phase 43 are all located on the front side mounting surface of the respective heat sink 10, the second portions of the first phase 41, the second phase 42 and the third phase 43 are all located on the rear side mounting surface of the respective heat sink 10, the input ends of the first portion and the second portion in each phase are all located above, the output ends are all located below, and when the heat sink 10 is installed, the input ends of the first phase 41, the second phase 42 and the third phase 43 correspond to the upper edge of the respective heat sink 10, and the output ends correspond to the lower edge of the respective heat sink 10.

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 and output ends of each phase of the three single-phase switching tube groups 40 are respectively located above and below, so that an input row 31 can be respectively provided along the upper edge of each radiator 10, the single-phase switching tube groups 40 corresponding to the first phase 41, the second phase 42 and the third phase 43 being respectively an input row first portion 31a, an input row second portion 31b and an input row third portion 31c; while three output rows 32, corresponding to the single-phase switching tube groups 40 of the first phase 41, the second phase 42, and the third phase 43, respectively, may be provided along the lower edge of each heat sink 10, respectively, an output row first portion 32a, an output row second portion 32b, and an output row third portion 32c.

Since each phase is divided into two parts located on the front side mounting surface and the rear side mounting surface of the heat sink 10, and the input row 31 and the output row 32 of each phase need to be connected to the respective switch modules of the phase at the same time, the input row 31 can 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 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.

Referring to fig. 11b, the capacitor busbar 50 is located at the rear side of the radiator 10, three single-phase switch tube groups 40 are mounted on the front side mounting surface and the rear side mounting surface of the respective radiator 10, and the extending direction of the input row 31 is parallel to the plate surface of the capacitor busbar 50; thus, in each single-phase switching tube group 40, the distance that each switching module is connected to the capacitor busbar 50 through the input row 31 is equal, the length of the commutating loop of each switching module is also equal, the stray inductance is reduced, and the switching loss is reduced.

Compared with embodiments 1 to 4, the power module provided in this embodiment has the advantages that the single-phase switch tube groups 40 are 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, and therefore, the current loop balance from the capacitor busbar 50 to each single-phase switch tube group 40 is improved, and meanwhile, the stray inductance is reduced. Meanwhile, compared with embodiment 7, by arranging the switching tubes 20 on the front and rear sides of the radiator 10, the volume of the radiator 10 is further reduced, the surface space utilization rate of the radiator 10 is improved, and the overall volume of the power assembly is also reduced.

Example 9

As an alternative embodiment, three single-phase switch tube groups 40 are each mounted on one radiator 10. In this way, since there is no need to provide a plurality of heat sinks 10 as described in the background art, the entire volume of the power module can be effectively reduced.

Further, the three single-phase switching tube groups 40 are divided into two parts to be respectively mounted on two mounting surfaces of the heat sink 10, and the switching modules on each mounting surface are arranged side by side in the left-right direction. In this embodiment, both of the mounting surfaces are parallel to the connecting portion. The parallel connection of the mounting surface and the connection portion referred to herein is considered to be that the flat plate-like heat sink 10 and the flat plate-like capacitor busbar 50 are arranged in a stacked manner. Therefore, the volume of the radiator 10 can be reduced, the space utilization rate of the radiator 10 is further improved, and the whole volume of the power assembly is reduced.

The above is further described below.

In each single-phase switching tube group 40, the output tube 22 of the switching module is located on the front mounting surface of the radiator 10, and the input tube 21 of the switching module is located on the rear mounting surface of the radiator 10. Corresponding to this arrangement, the above-mentioned "parallel arrangement" means that, in each single-phase switching tube group 40, the respective output tubes 22 are arranged side by side in the left-right direction, and the respective input tubes 21 are also arranged side by side in the left-right direction.

Referring to fig. 12a, there is shown the layout of three single-phase switching tube groups 40 on the heat sink 10 in this embodiment, and the corresponding directions. Meanwhile, reference is made to fig. 12b, which shows the configuration of the layout in side view and shows the corresponding direction. It should be noted that the direction shown in fig. 12a is a direction when viewed toward the front mounting surface of the heat sink 10, which is in front of the heat sink 10, that is, the direction shown in fig. 12a is only for indicating the direction of the front side view in fig. 12 a.

Referring to fig. 12a, in this embodiment, there are four switching modules constituting a single-phase switching tube group 40, and three single-phase switching tube groups 40 are a first phase 41, a second phase 42, and a third phase 43, respectively. The first phase 41, the second phase 42 and the third phase 43 are divided into two parts, namely 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 portion of each phase corresponds to a respective input pipe 21 in the single-phase switching tube group 40, and the second portion of each phase corresponds to a respective output pipe 22 in the single-phase switching tube group 40.

Referring to fig. 12a, in each single-phase switching tube group 40, the input ends of four switching modules collectively form the input end of the single-phase switching tube group 40, while the output ends of four switching modules collectively form the output end of the single-phase switching tube group 40. In each phase, the first portion is located on the rear mounting surface of the radiator 10, the second portion is located on the front mounting surface of the radiator 10, the first portion and the second portion need to be connected by a connection row 33, and the connection row 33 may be disposed to bypass the lower edge of the radiator 10.

Referring to fig. 12a, each single-phase switching tube group 40 is connected to the capacitor busbar 50 through the input row 31, and is connected to an output row 32. The input and output ends of each phase of the three single-phase switching tube groups 40 are located above, so that an input row 31 may be provided along the upper edge of the heat sink 10, the input row 31 being simultaneously connected to the three single-phase switching tube groups 40, while three output rows 32 may be provided along the upper edge of the heat sink 10, corresponding to the first phase 41, the second phase 42, and the third phase 43, respectively, the output row first portion 32a, the output row second portion 32b, and the output row third portion 32c.

Referring to fig. 12b, the capacitor busbar 50 is located at the rear side of the radiator 10, three single-phase switch tube groups 40 are installed on the front side installation surface and the rear side installation surface of the radiator 10, and the extending direction of the input row 31 is parallel to the plate surface of the capacitor busbar 50; thus, in each single-phase switching tube group 40, the distance that each switching module is connected to the capacitor busbar 50 through the input row 31 is equal, the length of the commutating loop of each switching module is also equal, the stray inductance is reduced, and the switching loss is reduced.

The first output row part 32a, the second output row part 32b and the third output row part 32c are all positioned above the front mounting surface of the radiator 10, and the positions are distributed intensively, so that the external output wiring can be facilitated.

In addition, in embodiment 3, since three single-phase switching tube groups 40 are arranged in parallel in the up-down direction, there is necessarily one single-phase switching tube group 40 located at the middle position, which results in that the input row and the output row corresponding to the single-phase switching tube group 40 occupy the surface space of the mounting surface of the radiator 10, resulting in that the utilization rate of the surface space of the radiator 10 by this layout is low, and the whole volume of the power assembly cannot be compressed to the limit. In the present embodiment, the three single-phase switching tube groups 40 are arranged side by side in the left-right direction, and although the length dimension of the power module in the left-right direction is increased, the input rows and the output rows 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.

Further, in the present embodiment, the number of the heat sinks 10 is one, but in other embodiments, the number of the heat sinks 10 may be three, the three heat sinks 10 are arranged along the left-right direction, and a complete single-phase switch tube set 40 is correspondingly installed on each heat sink 10, and the wiring manner of the single-phase switch tube set 40 may refer to the wiring manner of each single-phase switch tube set 40 in the present embodiment, but in the case of using three heat sinks 10, the connection rows 33 in each single-phase switch tube set 40 may directly bypass the upper edge or the lower edge of the heat sink 10 where the connection rows are located. By adopting three radiators 10, the requirement on the heat dissipation capacity of a single radiator 10 is reduced, the cost of the radiator 10 can be reduced, and meanwhile, the wiring and maintenance of the single-phase switch tube group on each radiator 10 are facilitated.

Example 10

As an alternative embodiment, the surface of the heat sink 10 forms two mounting surfaces parallel to the connection portion and for mounting each single-phase switching tube group, one of the mounting surfaces facing the connection portion and the other mounting surface facing away from the connection portion; one input pipe and one output pipe in each switch module are all installed on the same installation surface, and the other input pipe is all installed on the other installation surface. In this way, since there is no need to provide a plurality of heat sinks 10 as in the related art, the overall volume of the power module can be effectively reduced. In this embodiment, both of the mounting surfaces are parallel to the connecting portion. The parallel connection of the mounting surface and the connection portion referred to herein is considered to be that the flat plate-like heat sink 10 and the flat plate-like capacitor busbar 50 are arranged in a stacked manner.

Furthermore, in each single-phase switch tube group, the input tubes or the output tubes positioned on the same installation surface are arranged in parallel along the left-right direction correspondingly, and the two input tubes and the output tubes in each switch module are connected through a connecting row 33; the connection row 33 penetrates the radiator 10 to connect the input pipe and the output pipe at the respective mounting surfaces.

Further, each single-phase switching tube group is arranged in parallel in the left-right direction in the radiator 10. In each switch module, an input pipe and an output pipe which are arranged on the same installation surface are distributed along the vertical direction, and the two input pipes are corresponding in position. In each switch module, the input ends of the two input pipes point to the same direction and are connected with the same input row. In each switch module, the input end of the input pipe and the output end of the output pipe which are arranged on the same installation surface deviate.

The above is further described below.

Specifically, referring to fig. 13a, the layout of the three single-phase switching tube groups 40 on the heat sink 10 is shown, with the corresponding directions shown. Meanwhile, reference is made to fig. 13b, which shows the configuration of the layout in side view and shows the corresponding direction. It should be noted that the direction shown in fig. 13a is a direction when viewed toward the front mounting surface of the heat sink 10, which is in front of the heat sink 10, that is, the direction shown in fig. 13a is only for indicating the direction of the front side view in fig. 13 a.

Referring to fig. 13a, in this embodiment, there are four switching modules constituting a single-phase switching tube group 40, and three single-phase switching tube groups 40 are a first phase 41, a second phase 42, and a third phase 43, respectively. The first phase 41, the second phase 42 and the third phase 43 are equally divided into two parts, namely a first phase first part 41a and a first phase second part 41b, a second phase first part 42a and a second phase second part 42b, and a third phase first part 43a and a third phase second part 43b. The first portion of each phase corresponds to one input pipe 21 and one output pipe 22 of the single-phase switching tube group 40, and the second portion of each phase corresponds to the other input pipe 21 of the single-phase switching tube group 40.

Referring to fig. 13a, in each single-phase switching tube group 40, the respective input ends of the two input tubes 21 of the four switching modules collectively form the input end of the single-phase switching tube group 40, while the output ends of the four switching modules collectively form the output end of the single-phase even group.

The first phase 41, the second phase 42 and the third phase 43 are arranged on the radiator 10 in a line along the left-right direction, wherein the first phase first part 41a is positioned on the front side mounting surface of the radiator 10, the first phase second part 41b is positioned on the rear side mounting surface of the radiator 10, the second phase first part 42a is positioned on the front side mounting surface of the radiator 10, the second phase second part 42b is positioned on the rear side mounting surface of the radiator 10, the third phase first part 43a is positioned on the front side mounting surface of the radiator 10, and the third phase second part 43b is positioned on the rear side mounting surface of the radiator 10. In this way, the mounting surface on which the switching tube 20 is not provided can be left at the lower position of the rear mounting surface of the radiator 10, and the heat radiation efficiency of the radiator 10 can be improved.

Wherein the input pipe 21 of the first phase first portion 41a is located at an upper position of the front side mounting surface of the radiator 10, and the output pipe 22 of the first phase first portion 41a is located at a lower position of the front side mounting surface of the radiator 10 and directly below its corresponding input pipe 21; the input pipe 21 of the first-phase second portion 41b is located at an upper position of the rear mounting surface of the radiator 10, the position corresponding to the position of the input pipe 21 of the first-phase first portion 41 a. Between the inlet pipe 21 and the outlet pipe 22 of the first phase first portion 41a, are connected by a connection row 33; meanwhile, between the output pipe 22 of the first-phase first portion 41a and the input pipe 21 of the first-phase second portion 41b, there is also connected by the connection row 33, where since the output pipe 22 of the first-phase first portion 41a and the input pipe 21 of the first-phase second portion 41b are located on different mounting surfaces of the radiator 10, an opening may be provided at a corresponding position of the radiator 10, through which the connection row 33 passes to connect the output pipe 22 of the first-phase first portion 41a and the input pipe 21 of the first-phase second portion 41 b.

Referring to fig. 13a, each single-phase switching tube group 40 is connected to the capacitor busbar 50 through the input row 31, and is connected to an output row 32, wherein an input row 31 is provided because the input ends of the first phase 41, the second phase 42 and the third phase 43 are located above, i.e., corresponding to the upper edge of the radiator 10. Referring also to fig. 13b, since two input pipes 21 are located on the front side mounting surface and the rear side mounting surface of the radiator 10, respectively, in each phase, the structure of the input row 31 in this embodiment is different from that in embodiments 1 to 9.

Referring to fig. 13b, the capacitor busbar 50 is located at the rear side of the heat sink 10, and the extending direction of the input row 31 is parallel to the plate surface of the capacitor busbar 50; thus, in each single-phase switching tube group 40, the distance that each switching module is connected to the capacitor busbar 50 through the input row 31 is equal, the length of the commutating loop of each switching module is also equal, the stray inductance is reduced, and the switching loss is reduced. For the input row 31, which includes a positive electrode plate, a middle electrode plate and a negative electrode plate, taking the first phase 41 as an example, in this embodiment, the input tube 21 of the first phase first portion 41a is connected to the positive electrode plate and the middle electrode plate of the input row 31, the input tube 21 of the first phase second portion 41b is connected to the negative electrode plate and the middle electrode plate of the input row 31, at this time, the positive electrode plate and the middle electrode plate of the input row 31 need to be wound to the front side of the heat spreader 10 to be connected to the input tube 21 of the first phase first portion 41a, and the positive electrode plate and the middle electrode plate of the input row 31 may be stacked; and the input pipe 21 of the first-phase second portion 41b may be directly connected to the negative and middle plates of the capacitor busbar 50. Here, the input tube 21 of the first-phase second portion 41b may be connected to the negative and middle plates of the capacitor busbar 50 by a terminal or a line bank or the like, where the terminal or line bank still falls into the category of the input bank 31, but where the terminal or line bank does not need to be laminated with the positive and middle plates of the input bank 31, thereby reducing the manufacturing cost of the input bank 31. Meanwhile, under the layout configuration, the current-converting loop of the power module is shortened, the overall stray inductance is lower, and the use requirement can be met even if three polar plates of the input row 31 are not arranged in a stacked manner.

Similarly, the input rows 31 of the second phase 42 and the third phase 43 are also wired as described above, 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 radiator 10, only one input row 31 is needed to connect the capacitor busbar 50, so that the distances between each single-phase switch tube group 40 and the capacitor busbar 50 are equal, the current loop distances between the three single-phase switch tube groups 40 and the capacitor busbar 50 are consistent, and the time when the current reaches each single-phase switch tube group 40 is equal no matter the current direction of the capacitor busbar 50, so that the current loop balance is the best.

According to the power assembly provided by the embodiment, the two input pipes 21 in the switch module are respectively arranged on the front side and the rear side of the radiator 10, so that the integral current conversion loop of three-level topology is shortened, and the generation of stray inductance is reduced; and each single-phase switching tube group 40 is arranged in parallel, so that the current loop distances between the three single-phase switching tube groups 40 and the capacitor busbar 50 are consistent, and the current loop balance from the capacitor busbar 50 to each single-phase switching tube group 40 is improved.

Meanwhile, compared with embodiment 9, the power assembly provided in this embodiment further has the following advantages:

in embodiment 9, the switch modules are arranged side by side along the left-right direction, resulting in an excessively long dimension of the power module in the left-right direction, which may cause some difficulty in practical use and also affect the heat sink 10. Because the radiator 10 adopts a liquid cooling radiator, cooling liquid needs to be introduced into the radiator, if the cooling liquid is introduced into the left end or the right end of the radiator 10, the temperature uniformity of the radiator 10 at different positions can be reduced due to the fact that the other end of the radiator 10 is too far from the cooling liquid inlet; if the cooling liquid is introduced into the upper or lower end of the radiator 10, the cooling liquid pipeline may interfere with the input row 31 or the output row 32 of the power module.

In this embodiment, in each switch module, an input pipe and an output pipe are arranged on the mounting surface along the vertical direction, and then each switch module is arranged in parallel along the left-right direction, which shortens the size of the power module in the left-right direction, increases the size of the power module in the up-down direction, so that the size of the power module in the left-right direction and the size of the power module in the up-down direction are more balanced, besides the advantage of being convenient for practical implementation, the radiator 10 can also be selectively introduced with cooling liquid at the left end or the right end, and because the size of the left-right direction is shortened, the cooling liquid can be released in a better performance at each position of the radiator 10, and the overall temperature uniformity of the radiator 10 is better.

In addition, in the case that the number of the switching tubes 20 in the switching module is three, in this embodiment, a free portion is left at the lower position on the mounting surface at the rear side, when the cooling liquid flow channel is actually designed, the upper half portion of the radiator 10 can be designed to be a cooling liquid inlet flow channel, and the lower half portion is designed to be a cooling liquid return flow channel, so that the cooling efficiency of the input tube 21 with higher temperature release can be just improved, and the cooling liquid temperature in the cooling liquid return flow channel is higher, and the cooling effect of the output tube 22 with lower temperature release cannot be affected.

Example 11

This embodiment is a further refinement of embodiment 10 in which the same layout as the individual single-phase switching tube groups 40 in embodiment 10 is employed, except that each single-phase switching tube group 40 in this embodiment is composed of three switching modules.

The power assembly provided in this embodiment is further described below.

Referring to fig. 14, 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 module provided in the present embodiment is shown.

Referring to fig. 15 and 16, in the power assembly provided in this embodiment, a single-phase switching tube set 40 is formed by three switching modules, and a total of nine switching modules form three single-phase switching tube sets 40, and each single-phase switching tube set 40 outputs a single-phase alternating current through a corresponding output row 32, and the three single-phase switching tube sets cooperate to output a three-phase alternating current. Wherein, in the three switch modules in each single-phase switch tube group 40, two input tubes 21 are respectively positioned on the front side mounting surface and the rear side mounting surface of the radiator 10 and positioned at the upper part of the radiator 10, and an output tube 22 is positioned on the front side mounting surface of the radiator 10 and positioned at the lower part of the radiator 10; the input pipe 21 and the output pipe 22 positioned on the front side mounting surface of the radiator 10 are connected through a connecting row 33; the input pipe 21 on the rear side mounting surface of the radiator 10 and the output pipe 22 on the front side mounting surface of the radiator 10 are connected by another connection row 33, and the connection row 33 passes through an opening provided in the radiator 10 to penetrate the radiator 10 to the front and rear sides.

Referring to fig. 17, in the power module provided in this embodiment, the capacitor busbar 50 includes three electrode plates, which are respectively a positive electrode plate 51 of the capacitor busbar, a line plate 52 of the capacitor busbar, and a negative electrode plate 53 of the capacitor busbar, and the three electrode plates are sequentially a positive electrode plate 51 of the capacitor busbar, a line plate 52 of the capacitor busbar, and a negative electrode plate 53 of the capacitor busbar from back to front, and are stacked, with the negative electrode plate 53 of the capacitor busbar being closest to the heat sink 10.

The input row 31 likewise includes three sections, namely an input row positive plate 311, an input row neutral plate 312, and an input row post 313. In the present embodiment, the terminals of the input tube 21 located on the front side mounting surface of the heat sink 10 are adapted to be connected to the capacitor busbar positive plate 51 and the capacitor busbar neutral plate 52, so that one ends of the input-row positive plate 311 and the input-row neutral plate 312 are connected to the capacitor busbar positive plate 51 and the capacitor busbar neutral plate 52, and the other ends extend to the front of the heat sink 10 to be connected to the input tube 21 in each of the switch modules. Meanwhile, the terminal of the input tube 21 positioned on the rear mounting surface of the heat sink 10 is adapted to be connected to the capacitor busbar plate 52 and the capacitor busbar negative plate 53 without the heat sink 10 blocking between the capacitor busbar 50 and the input tube 21, so that the negative terminal of the input tube 21 can be directly connected to the capacitor busbar negative plate 53 by the input row terminal 313 while the neutral terminal of the input tube 21 is connected to the capacitor busbar plate 52.

The connection row 33 includes two parts, a connection row first part 331 and a connection row second part 332, respectively, wherein the connection row first part 331 connects the input pipe 21 and the output pipe 22 located on the front side mounting surface of the radiator 10, and the connection row second part 332 connects the input pipe 21 located on the rear side mounting surface of the radiator 10 and the output pipe 22 located on the front side mounting surface of the radiator 10.

The radiator 10 used in this embodiment is a liquid-cooled radiator, which can effectively meet the heat dissipation requirement of the switch tube 20.

Compared with embodiments 1-9, the power assembly provided in this embodiment not only can reduce the volume of the radiator 10 as a whole, but also can make the length and width of the radiator 10 in proper ranges, which is beneficial to the practical application of the power assembly, and the positions of the input end and the output end of each switch tube 20 are reasonably arranged, so that the stray inductance is effectively reduced, and the power assembly also has better current loop balance.

Example 12

Example 12 is based on example 10, the difference being that in example 12:

in each switch module, the input pipe and the output pipe which are arranged on the same installation surface are distributed along the up-down direction, and the two input pipes are staggered in position. In each switch module, the input ends of the two input pipes are deviated. In each switch module, the input end of the input pipe and the output end of the output pipe which are arranged on the same installation surface deviate.

Referring to fig. 18a and 18b, an input pipe 21 is installed at the upper portion of the front mounting surface of the radiator 10, and its input end is located at the upper side; the other input pipe 21 is provided at the lower portion of the rear mounting surface of the radiator 10, and its input end is located at the lower side. Among them, the connection between the input tube 21 and the input row 31 on the front mounting surface can be referred to embodiment 10. The input tube 21 on the rear mounting surface can be directly connected to the connection portion of the capacitor busbar 50 through a terminal, and reference is made to embodiment 11.

Example 13

Referring to fig. 19, this embodiment is based on embodiment 10, and differs in that in embodiment 13, the heat sink 10 is formed with a mounting surface having a certain inclination angle with respect to the connection portion, and one of the two mounting surfaces is formed to face up with respect to the capacitor busbar 50, and the other mounting surface is formed to face down with respect to the capacitor busbar 50.

Specifically, the heat sink 10 has a mounting surface that is vertically aligned with the connection portion of the capacitor busbar 50, and one of the mounting surfaces faces upward and the other mounting surface faces downward. Compared with embodiment 10, with reference to what is described in embodiment 11, the input tubes 21 can be directly connected with the capacitor busbar through the binding posts without adopting copper bars or the like, the wiring is simpler, the distances between the two input tubes 21 and the capacitor busbar 50 in the same switch module are consistent, and compared with embodiment 10, the distance between the two input tubes is shorter, so that stray inductance can be reduced better.

It should be understood that this layout is equally applicable to embodiments 1-9 described above, and that only adaptation modifications are needed, corresponding to each embodiment. However, in order to improve the practical use effect of this layout, it is preferable to use a technical solution that 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 as an improvement, and this technical solution can be directly connected to the capacitor busbar 50 because the input row 31 is located at the edge, so as to reduce the length of the converter loop, thereby achieving the effect of reducing the stray inductance.

Example 14

The present embodiment provides a current transformer including a current transformer housing having the power module of any one of embodiments 1 to 13 mounted therein.

The radiator 10 of the liquid-cooled converter is a liquid-cooled radiator.

The foregoing description of the embodiments and description is presented to illustrate the scope of the invention, but is not to be construed as limiting the scope of the invention. Modifications, equivalents, and other improvements to the embodiments of the invention or portions of the features disclosed herein, as may occur to persons skilled in the art upon use of the invention or the teachings of the embodiments, are intended to be included within the scope of the invention, as may be desired by persons skilled in the art from a logical analysis, reasoning, or limited testing, in combination with the common general knowledge and/or knowledge of the prior art.

Claims

1. A power assembly, comprising:

the capacitor module comprises a direct-current capacitor pool and a capacitor busbar (50) which are connected with each other; the capacitor busbar (50) is provided with a connecting part;

the power module comprises an input row (31), an output row (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 row (31) and the output row (32); the input row (31) is connected with the connecting part; the output row (32) is used for outputting electric energy; the switching tube (20) included in each switching module is divided into an input tube (21) and an output tube (22) according to types;

It is characterized by also comprising:

at least one radiator (10) the surfaces of which form two mounting surfaces facing away from each other and for mounting each single-phase switching tube group (40);

each of the switch modules is divided into a portion including only an input pipe (21) and a portion including only an output pipe (22) according to the type of the switch pipe (20), and any one of the mounting surfaces of the same heat sink (10) includes only a portion thereof.

2. A power assembly according to claim 1, wherein both of said mounting surfaces are parallel to said connecting portion, and wherein one of said mounting surfaces faces said connecting portion and the other mounting surface faces away from said connecting portion.

3. A power assembly according to claim 2, characterized in that in each single-phase switching tube group (40), the input tube (21) and the output tube (22) of each switching module in each section are arranged side by side in the right-left direction, respectively, and the input tube (21) and the output tube (22) of each switching module are connected by a connection row (33).

4. A power assembly according to claim 3, characterized in that in each switching module the switching tube (20) is of the type of an input tube (21) and the switching tube (20) is of the type of an output tube (22) and the switching tube is of the type of an input tube (21) and the switching tube is of the type of an output tube (22).

5. A power module according to claim 4, wherein the number of the heat sinks (10) is one, and three single-phase switching tube groups (40) are sequentially arranged in the up-down direction at the upper, middle and lower portions of the heat sink (10); in a single-phase switching tube group (40) located at the upper and/or lower part of the radiator (10), a connection row (33) bypasses the upper edge and/or lower edge of the radiator (10); in a single-phase switch tube group (40) located in the middle of the radiator (10), a connection row (33) penetrates through the radiator (10) in the front-rear direction.

6. A power module according to claim 4, wherein the number of the heat sinks (10) is one, and three single-phase switching tube groups (40) are sequentially arranged in the up-down direction at the upper, middle and lower portions of the heat sink (10); in a single-phase switching tube group (40) located at the upper part, middle part and/or lower part of the radiator (10), a connection row (33) penetrates the radiator (10) in the front-rear direction.

7. A power module according to claim 4, characterized in that each single-phase switching tube group (40) is arranged in parallel in the up-down direction to the heat sink (10); the number of the radiators (10) is three, the three radiators (10) are distributed along the up-down direction, and each radiator (10) is correspondingly provided with a single-phase switch tube group (40); in each single-phase switching tube group (40), the connection row (33) bypasses the upper edge or the lower edge of the radiator (10) where the connection row is located.

8. A power module according to claim 4, wherein the number of the heat sinks (10) is one, three single-phase switch tube groups (40) are arranged in parallel in the left-right direction on the heat sinks (10), and input ends of the three single-phase switch tube groups (40) are connected with the same input row (31); in each single-phase switching tube group (40), the connection row (33) bypasses the upper edge or the lower edge of the radiator (10) where the connection row is located.

9. A power module according to claim 4, wherein each single-phase switching tube group (40) is arranged in parallel in the left-right direction to the heat sink (10); the number of the radiators (10) is three, the three radiators (10) are distributed along the left-right direction, each radiator (10) is correspondingly provided with one single-phase switch tube group (40), and the input ends of the three single-phase switch tube groups (40) are connected with the same input row (31); in each single-phase switching tube group (40), the connection row (33) bypasses the upper edge or the lower edge of the radiator (10) where the connection row is located.

10. A liquid cooled converter comprising a power assembly according to any one of claims 1-9, wherein the heat sink (10) is a liquid cooled heat sink.