Power assembly and liquid cooling converter

Abstract

The invention discloses a power assembly and a liquid cooling converter, the power assembly comprises a capacitor module and a power module, in the capacitor module, a direct current capacitor pool comprises a first capacitor pool and a second capacitor pool, a capacitor busbar comprises a first busbar and a second busbar, and planes where the first busbar and the second busbar are located are intersected or parallel; in the power module, a mounting base body is provided with a first mounting surface and a second mounting surface which are deviated from each other, the first mounting surface is close to a first busbar, and the second mounting surface is close to a second busbar; the power tube group comprises a plurality of switching devices, and part of the switching devices are connected with the capacitor busbar through wiring components and are divided into first switches and second switches according to the connection relation with polar plates with different polarities on the capacitor busbar; each first switch is located on the first mounting surface and is connected with the first busbar through a wiring component, and each second switch is located on the second mounting surface and is connected with the second busbar through a wiring component. The structure of the power assembly can reduce stray inductance generated during operation.

Description

Technical Field

[0001] The present invention relates to the technical field of converters, and in particular to a power component and a liquid-cooled converter. Background Art

[0002] Converters are widely used in power systems, rail transit, military industry, petroleum machinery, new energy vehicles, wind power generation, solar photovoltaic and other fields. They are connected between the battery system and the power grid to achieve two-way conversion of electric energy. They can control the charging and discharging process of the battery, perform AC / DC conversion, and directly supply power to AC loads without a power grid. At the same time, NPC (Neutral Point Clamp) or ANPC (Active Neutral Point Clamp) three-level topologies can use low blocking voltage IGBT devices to increase the DC bus voltage, thereby increasing the AC output voltage and expanding the system power level. Therefore, they are widely used in converters.

[0003] Conventionally, the converter mainly includes power components, which are used to achieve bidirectional conversion between DC and AC. The power components in the converter generally include capacitor modules and power modules. The capacitor modules mainly include DC capacitor pools and capacitor busbars. The power modules mainly include power tube groups and heat sinks. The power tube groups are installed on the heat sink and then connected to the DC busbar through the input busbar. For details, refer to Figure 1 , which shows the structure of the power component in the converter in the prior art. The power component may include a capacitor busbar 01, a DC capacitor pool 02, an input row 03, a power tube group 04, an output row 05, and a radiator 06. Among them, the input row 03, the power tube group 04, and the output row 05 constitute the above-mentioned power module, and the power tube group 04 is installed on the radiator 06. The radiator 06 adopts an air-cooled radiator, and its back has cooling fins, so the input row 03, the power tube group 04, and the output row 05 are all installed on the front of the radiator 06. Among them, since the output of the power device is three-phase alternating current, its power module includes three power tube groups 04 and three corresponding radiators 06, each power tube group 04 is installed on a radiator 06, and the input row 03 in the three power modules is connected to the capacitor busbar 01. Furthermore, the capacitor busbar 01 includes a positive plate, a negative plate and a neutral plate, which are stacked and isolated from each other by insulating plates; correspondingly, the input bus 03 in each power module also includes a positive plate, a negative plate and a neutral plate, and is connected to the corresponding plates in the capacitor busbar 01.

[0004] Reference Figure 2, which shows a circuit diagram of a three-level topology in the prior art. For a power component adopting a three-level topology, the power tube group 04 generally includes three IGBT devices in each complete three-level topology, corresponding to Figure 2 In the circuit shown, tubes 1 and 2 are input tubes, tubes 3 and 4 are input tubes, and tubes 5 and 6 are output tubes. The first end of tube 1 is connected to the positive plate of the capacitor busbar, the first end of tube 2 is connected to the neutral plate of the capacitor busbar, the second ends of tubes 1 and 2 are connected and then connected to the first end of tube 5; the first end of tube 3 is connected to the negative plate of the capacitor busbar, the first end of tube 4 is connected to the neutral plate of the capacitor busbar, the second ends of tubes 3 and 4 are connected and then connected to the first end of tube 6; the second ends of tubes 5 and 6 are then connected to the output busbar. The capacitor pool connected to the capacitor busbar is also divided into two parts, corresponding to Figure 2 C1 and C2 in .

[0005] In the existing three-level topology circuit diagram, there is a problem of high stray inductance. Stray inductance is also called parasitic inductance. In the three-level topology, it mainly includes the stray inductance generated inside the IGBT device, the stray inductance of the capacitor busbar, and the stray inductance of the capacitor in the capacitor pool. These stray inductances will affect the instantaneous voltage and current of the power component, and will also affect the loss and heat generation of the power component. Figure 1 In the structure of the existing power assembly shown, due to the arrangement of the power module relative to the capacitor module, the commutation loop of the IGBT device far from the capacitor module is longer, the generated stray inductance is higher, and thus the overall stray inductance is higher. Summary of the invention

[0006] The object of the present invention is to overcome the above-mentioned defects or problems existing in the background technology and to provide a power component and a liquid-cooled converter, which can reduce the stray inductance generated when the power component is running.

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

[0008] Technical solution 1: A power component, comprising: a capacitor module, comprising a DC capacitor pool and a capacitor busbar connected to each other; the DC capacitor pool comprises a first capacitor pool and a second capacitor pool, and the capacitor busbar comprises a first busbar and a second busbar; the first capacitor pool is connected to the first busbar, and the second capacitor pool is connected to the second busbar; the planes where the first busbar and the second busbar are located intersect or are parallel, and both include a plurality of plates with different polarities, and the plates with the same polarity in the two are connected to each other; a power module, comprising a mounting base, a power tube group and a wiring component; the mounting base has a first mounting surface and a second mounting surface that are opposite to each other, wherein the first mounting surface is close to the first busbar relative to the second mounting surface, and the second mounting surface is close to the second busbar relative to the first mounting surface; the power tube group comprises a plurality of switch devices, wherein some of the switch devices are connected to the capacitor busbar through a wiring component, and are divided into a first switch and a second switch according to the connection relationship with the plates of different polarities on the capacitor busbar; each of the first switches is located on the first mounting surface and is connected to the first busbar through the wiring component, and each of the second switches is located on the second mounting surface and is connected to the second busbar through the wiring component.

[0009] Technical solution 2 based on technical solution 1: the planes where the first busbar and the second busbar are located are perpendicular to each other; the first mounting surface of the mounting base is perpendicular to the plane where the first busbar is located, and the second mounting surface is parallel to the plane where the second busbar is located.

[0010] Technical solution three based on technical solution two: the plates of the first busbar and the second busbar include positive plates, neutral plates and negative plates according to different polarities; the first busbar is installed and arranged in sequence from far to near with a distance from the first installation surface as positive plates, neutral plates and negative plates; the second busbar is installed and arranged in sequence from far to near with a distance from the second installation surface as negative plates, neutral plates and positive plates; the first switch is connected to the positive plate and neutral plate of the first busbar through a wiring component; the second switch is connected to the negative plate and neutral plate of the second busbar through a wiring component.

[0011] Technical solution 4 based on technical solution 2: the plates of the first busbar and the second busbar include positive plates, neutral plates and negative plates according to different polarities; the first busbar is stacked in sequence from far to near as negative plates, neutral plates and positive plates according to the distance from the first mounting surface; the second busbar is stacked in sequence from far to near as positive plates, neutral plates and negative plates according to the distance from the second mounting surface; the first switch is connected to the negative plate and neutral plate of the first busbar through a wiring component; the second switch is connected to the positive plate and neutral plate of the second busbar through a wiring component.

[0012] Technical solution five based on technical solution three or four: the wiring component includes a first wiring assembly and a second wiring assembly; the first wiring assembly connects each of the first switches and the first busbar; the second wiring assembly connects each of the second switches and the second busbar.

[0013] Technical solution six based on technical solution five: the first wiring assembly includes a first bus and a second bus arranged in a stacked manner; each of the first switches is arranged along a first direction on the first mounting surface; the first bus and the second bus both extend along the first direction and are connected to each of the first switches.

[0014] Technical solution seven based on technical solution six: the first bus and the second bus both have a first connecting part and a second connecting part; the first connecting part connects each of the first switches, and the plane where the first connecting part is located is parallel to the first mounting surface; the second connecting part connects the first bus, and the plane where the second connecting part is located is perpendicular to the first mounting surface.

[0015] Technical solution eight based on technical solution five: the second wiring assembly includes a third bus and a fourth bus arranged in a stacked manner; each of the second switches is arranged along the first direction on the second mounting surface; the third bus and the fourth bus both extend along the first direction and are connected to each of the second switches.

[0016] Technical solution nine based on technical solution eight: the third bus and the fourth bus both have a third connection part, a fourth connection part and a turning part; the third connection part connects each of the second switches, and the plane where the third connection part is located is parallel to the second mounting surface; the fourth connection part connects the second busbars, and the plane where the fourth connection part is located is parallel to the second mounting surface; the turning part connects the third connection part and the fourth connection part, and the plane where the third connection part is located is perpendicular to the second mounting surface.

[0017] In addition, the present invention also provides technical solution ten: a liquid-cooled converter, which includes a converter cabinet, characterized in that the converter cabinet is equipped with a power component as described in any one of technical solutions one to nine; and the mounting base is a liquid-cooled radiator.

[0018] It can be seen from the above description of the present invention that, compared with the prior art, the present invention has the following beneficial effects:

[0019] Technical solution 1 provides a power component, which includes a capacitor module and a power module, wherein the DC capacitor pool and the capacitor busbar in the capacitor module are divided into two independent parts, namely the first capacitor pool, the second capacitor pool and the first busbar, the second busbar, and the position relationship between the first busbar and the second busbar is that they have a certain angle or are parallel to each other; at the same time, the first mounting surface of the mounting base in the power module is close to the first busbar, and the second mounting surface is close to the second busbar, and the power tube group is divided into a first switch and a second switch, which are respectively arranged on the first mounting surface and the second mounting surface, and then connected through a wiring component. The first switch is connected to the first busbar, and the second switch is connected to the second busbar; compared with the method of setting a complete capacitor busbar in the prior art, in the power component provided by the present technical solution, the capacitor busbar is split into two independent parts, and the two independent parts can more freely adjust their positions relative to the power tube group. The positional relationship and connection distance between the first switch, the second switch and the capacitor busbar will not be affected by each other, and can be decoupled from each other and connected to the first busbar and the second busbar respectively. The commutation loop formed between the power tube group and the capacitor busbar is shorter, thereby reducing the overall stray inductance.

[0020] In technical solution two, the planes where the first busbar and the second busbar are located are perpendicular to each other. At this time, the first mounting surface on the mounting base is perpendicular to the first busbar, and the second mounting surface is parallel to the second busbar. With this arrangement, sufficient operation and maintenance space can be reserved at the position of the first mounting surface, while at the same time, the distance between the second switch and the second busbar at the position of the second mounting surface can be shorter than that of the conventional setting. Although the first mounting surface is perpendicular to the first busbar, the first busbar can be set close to the mounting base, thereby reducing the distance between the first busbar and the first mounting surface.

[0021] In Technical Solution 3 and Technical Solution 4, since the first switch and the second switch are only connected to the plates of two polarities in the capacitor busbar at the same time, the stacking relationship of the plates of different polarities on the first busbar and the second busbar can be adjusted according to the specific settings of the first switch and the second switch, and the plates of corresponding polarities can be set closer to the corresponding first switch or second switch. In this way, when the first switch or the second switch is connected to the capacitor busbar through the wiring component, it only needs to pass through the two closest layers of plates at most, which reduces the difficulty of processing and assembly. In addition, since there is one less layer of plate to pass through, the current carrying capacity of the plate will also be improved, and the overall commutation circuit of the power tube group and the capacitor busbar will be further shortened, further reducing the overall stray inductance.

[0022] In technical solution five, the wiring component includes a first wiring component and a second wiring component, which can respectively connect the first switch and the second switch to the first busbar and the second busbar. The wiring component is divided into two independent parts, so that the wiring components can independently realize the connection between the power tube group and the capacitor busbar, avoiding mutual interference between the power tube groups located on the first mounting surface and the second mounting surface on the wiring component.

[0023] In technical solution six, the first wiring assembly includes a first bus and a second bus arranged in a stacked manner, which are used to connect the first switch and the first busbar, and the first bus and the second busbar are flat and wide structures, which can improve the current carrying capacity. At the same time, the stacked arrangement of the two can further reduce the stray inductance between the first switch and the first busbar.

[0024] In Technical Solution 7, the first connecting portion and the second connecting portion on the first busbar and the second busbar are perpendicular to each other, which is adapted to the configuration in which the first mounting surface and the first busbar are perpendicular to each other. This can shorten the connection distance between the first switch and the first busbar, shorten the length of the commutation loop between the first switch and the first busbar, and reduce stray inductance.

[0025] In technical solution eight, the second wiring assembly includes a third bus and a fourth bus arranged in a stacked manner, which are used to connect the second switch and the second busbar, and the third bus and the fourth busbar are flat and wide structures, which can improve the current carrying capacity. At the same time, the stacked arrangement of the two can further reduce the stray inductance between the second switch and the second busbar.

[0026] In technical solution nine, the third connection part and the fourth connection part on the third bus and the fourth bus are parallel to each other, adapted to the configuration in which the second mounting surface and the second busbar are parallel to each other, and the third connection part and the fourth connection part are connected by a turning part at the same time, ensuring the shortest connection distance between the second switch and the second busbar, thereby reducing stray inductance.

[0027] Technical solution ten provides a liquid-cooled converter which adopts the above-mentioned power components and has the advantage of low stray inductance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a structural schematic diagram of a power component in the background technology;

[0030] Figure 2 A circuit diagram of a three-level topology structure in the background technology;

[0031] Figure 3 It is a schematic diagram of the structure of a power component involved in an embodiment of the present invention;

[0032] Figure 4 A schematic side view of a power component according to an embodiment of the present invention;

[0033] Figure 5 for Figure 4 A magnified view of part A;

[0034] Figure 6 Schematic diagram of the explosion of the power component involved in the embodiment of the present invention Figure 1 ;

[0035] Figure 7 Schematic diagram of the explosion of the power component involved in the embodiment of the present invention Figure 2 ;

[0036] Figure 8 is a schematic diagram of a first wiring assembly in a power assembly according to an embodiment of the present invention;

[0037] Fig. 9 is a schematic diagram of a second wiring assembly in a power assembly according to an embodiment of the present invention;

[0038] Fig.10 It is a schematic diagram of the structure of a switch device in a power component involved in an embodiment of the present invention.

[0039] Description of main reference numerals:

[0040] Capacitor module 10; DC capacitor pool 11; first capacitor pool 111; second capacitor pool 112; capacitor busbar 12; first busbar 121; second busbar 122; positive plate 13; neutral plate 14; negative plate 15; connection hole 16;

[0041] Power module 20; mounting base 21; first mounting surface 211; second mounting surface 212; power tube group 22; switch device 221; switch terminal 2211; first switch 222; second switch 223; third switch 224; wiring component 23; first wiring assembly 231; first bus 2311; second bus 2312; first connecting portion 2313; second connecting portion 2314; second wiring assembly 232; third bus 2321; fourth bus 2322; third connecting portion 2323; fourth connecting portion 2324; turning portion 2325; connecting column 24; power output row 25. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the claims, description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. are for distinguishing different objects rather than for describing a specific order.

[0044] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the present invention.

[0045] In the claims, specification and the above drawings of the present invention, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0046] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0047] The embodiment of the present invention relates to a power component, referring to Figure 3 The power assembly mainly includes a capacitor module 10 and a power module 20. The capacitor module 10 includes a DC capacitor pool 11 and a capacitor busbar 12, and the power module 20 includes a mounting base 21, a power tube group 22 and a wiring component 23.

[0048] Reference Figure 3In the capacitor module 10, the DC capacitor pool 11 and the capacitor busbar 12 are connected to each other, wherein the DC capacitor pool 11 includes a first capacitor pool 111 and a second capacitor pool 112, and the capacitor busbar 12 includes a first busbar 121 and a second busbar 122; the first capacitor pool 111 is connected to the first busbar 121, and the second capacitor pool 112 is connected to the second busbar 122. The planes where the first busbar 121 and the second busbar 122 are located intersect or are parallel, and both include a plurality of plates with different polarities, and the plates with the same polarity are connected to each other.

[0049] Specifically, the DC capacitor pool 11 includes a plurality of electrolytic capacitors, which are divided into two equal parts, namely, a first capacitor pool 111 and a second capacitor pool 112; at the same time, the capacitor busbar 12 is divided into two interconnected first busbars 121 and second busbars 122. In this embodiment, the planes where the first busbar 121 and the second busbar 122 are located are perpendicular to each other. Figure 3 Taking the direction shown as an example, the plane where the first busbar 121 is located is horizontal, the plane where the second busbar 122 is located is vertical, the rear end of the first busbar 121 is connected to the upper end of the second busbar 122 as a whole, and the capacitor busbar 12 is generally in an "L" shape. The first capacitor pool 111 is installed on the lower surface of the first busbar 121, and the second capacitor pool 112 is installed on the rear side of the second busbar 122. The power module 20 is arranged below the first busbar 121 and in front of the second busbar 122.

[0050] In another embodiment, the planes where the first busbar 121 and the second busbar 122 are located can be parallel to each other. For example, the plane where the first busbar 121 is located is in the vertical direction, and the plane where the second busbar 122 is located is also in the vertical direction. In this case, the power module 20 can be arranged between the first busbar 121 and the second busbar 122 along the front-to-back direction, and the first capacitor pool 111 can be installed on the front side of the first busbar 121, and the second capacitor pool 112 can be installed on the rear side of the second busbar 122. At this time, the upper end of the first busbar 121 and the upper end of the second busbar 122 are connected as a whole.

[0051] Alternatively, in another embodiment, the planes where the first busbar 121 and the second busbar 122 are located may have a certain angle, and the angle should be an acute angle, that is, the first busbar 121 and the second busbar 122 are close to each other. In this case, the power module 20 can be arranged between the first busbar 121 and the second busbar 122, and the power module 20 is closer to the second busbar 122, so as to leave enough space between the power module 20 and the first busbar 121 for operation and maintenance.

[0052] As one of the aspects involved in the embodiment of the present invention, the first busbar 121 and the second busbar 122 each include three plates with different polarities, namely a positive plate 13, a neutral plate 14 and a negative plate 15, and the plates with the same polarity in the first busbar 121 and the second busbar 122 are connected to each other. In the first busbar 121 and the second busbar 122, the positive plate 13, the neutral plate 14 and the negative plate 15 are combined into one in a stacked manner, an insulating layer is provided between the three, and the three are respectively connected to the positive pole, the negative pole and the neutral point of the DC switch. The configuration of each plate in the first busbar 121 and the second busbar 122 and the connection method of the plates with the same polarity in the first busbar 121 and the second busbar 122 will be described in detail below.

[0053] Reference Figure 3 The power module 20 includes a mounting base 21, a power tube group 22 and a wiring component 23; the mounting base 21 has a first mounting surface 211 and a second mounting surface 212 that are opposite to each other, wherein the first mounting surface 211 is close to the first busbar 121 relative to the second mounting surface 212, and the second mounting surface 212 is close to the second busbar 122 relative to the first mounting surface 211; the power tube group 22 includes a plurality of switch devices 221, wherein some of the switch devices 221 are connected to the capacitor busbar 12 through the wiring component 23, and are divided into first switches 222 and second switches 223 according to the connection relationship with the plates of different polarities on the capacitor busbar 12; each of the first switches 222 is located on the first mounting surface 211 and is connected to the first busbar 121 through the wiring component 23, and each of the second switches 223 is located on the second mounting surface 212 and is connected to the second busbar 122 through the wiring component 23.

[0054] The term "close" used herein refers to a state in which the mounting base is arranged to be located between the first busbar and the second busbar. At this time, if it is necessary to make the first mounting surface close to the first busbar or the second mounting surface close to the second busbar, the mounting base only needs to be moved or rotated toward the first busbar, or moved or rotated toward the second busbar.

[0055] Specifically, the mounting base 21 is a flat plate-shaped component. In this embodiment, it can be used as a liquid cooling radiator. Therefore, a liquid cooling pipe is also provided inside the mounting base 21. At the same time, the mounting base 21 needs to be made of a heat-conducting metal material. When the power tube group 22 is installed on the mounting base 21, the heat dissipation surface of the power tube group 22 needs to be closely attached to the surface of the mounting base 21. Figure 4The front and rear surfaces of the mounting base 21 respectively form a first mounting surface 211 and a second mounting surface 212. In this embodiment, the first mounting surface 211 of the mounting base 21 is perpendicular to the plane where the first busbar 121 is located, and the second mounting surface 212 is parallel to the plane where the second busbar 122 is located.

[0056] In another embodiment, the mounting base 21 may be configured to have different positions according to different angle relationships between the planes where the first busbar 121 and the second busbar 122 are located. For example, when the planes where the first busbar 121 and the second busbar 122 are located are parallel, the first mounting surface 211 and the second mounting surface 212 of the mounting base 21 are parallel to the first busbar 121 and the second busbar 122, respectively. At this time, the first mounting surface 211 of the mounting base 21 is the shortest distance from the first busbar 121, and the second mounting surface 212 is the shortest distance from the second busbar 122.

[0057] The power tube group 22 includes three single-phase switch groups, each of which includes four switch modules, and each switch module includes three switch devices 221. The four switch modules in each single-phase switch group are arranged along the left-right direction, and the three single-phase switch groups are also arranged along the left-right direction. Figure 7 In this embodiment, 12 groups of switch modules are arranged along the left and right directions. The switch device 221 is an IGBT module. Fig.10 Each switch device 221 includes four switch terminals 2211, and the four switch terminals 2211 are used to connect the capacitor busbar 12, other switch devices 221 or the copper busbar connected to the AC switch.

[0058] Reference Figure 4, the three switch devices 221 of each switch module include a first switch 222 connected to the first busbar 121, a second switch 223 connected to the second busbar 122, and a third switch 224 connected to the third busbar. At the same time, the first switch 222 is connected to the positive plate 13 and the neutral plate 14 in the first busbar 121, and the second switch 223 is connected to the negative plate 15 and the neutral plate 14 in the second busbar 122. In this embodiment, the first switch 222 is located on the first mounting surface 211 of the mounting base 21, the second switch 223 is located on the second mounting surface 212 of the mounting surface base, and the third switch 224 is also located on the first mounting surface 211 of the mounting base 21, but the third switch 224 is located below the first switch 222. The first switch 222, the second switch 223 and the third switch 224 are connected by a copper busbar. A copper busbar as a power output terminal is extended below the third switch 224, and the power output terminal is used to output or receive three-phase electricity. In this embodiment, the external connection terminal of the capacitor busbar 12 can be arranged at the rear end of the first busbar 121. At the same time, in each switch module, the three switch devices 221 occupy a unit size of the width of a switch device 221 in the left and right directions, and the first switch 222 and the second switch 223 are symmetrically located relative to the mounting base 21. Figure 2 In the circuit shown in FIG. 1 , the first switch 222 is Figure 2 The second switch 223 is Figure 2 The third switch 224 is Figure 2 Tube 5 and tube 6 in.

[0059] Reference Figure 4 and Figure 5 In this embodiment, the plates of the first busbar 121 and the second busbar 122 include positive plates 13, neutral plates 14 and negative plates 15 according to different polarities; the first busbar 121 is installed at a distance from the first mounting surface 211 from far to near and is stacked in sequence as positive plates 13, neutral plates 14 and negative plates 15; the second busbar 122 is installed at a distance from the second mounting surface 212 from far to near and is stacked in sequence as negative plates 15, neutral plates 14 and positive plates 13; the first switch 222 is connected to the positive plates 13 and neutral plates 14 of the first busbar 121 through the wiring component 23; the second switch 223 is connected to the negative plates 15 and neutral plates 14 of the second busbar 122 through the wiring component 23. Specifically, referring to Figure 5 , which is Figure 4 The enlarged view of the A part in the figure shows the arrangement of the plates of different polarities on the capacitor busbar 12 in this embodiment. The plates on the first busbar 121 are respectively the negative plate 15, the neutral plate 14 and the positive plate 13 from top to bottom, and the plates on the second busbar 122 are respectively the negative plate 15, the neutral plate 14 and the positive plate 13 from front to back. Figure 6, at the position where the first busbar 121 and the second busbar 122 are connected, there are 9 connection holes 16, of which 3 are grouped together, and each group of connection holes 16 is arranged in the left-right direction, and the 3 connection holes 16 in each group are arranged in the front-back direction. Each connection hole 16 is arranged on the first busbar 121 and penetrates the three layers of plates. Among them, the plates in the second busbar 122 are bent forward at the upper end position to have a sufficient contact area with the first busbar 121. At the same time, the negative plate 15 in the second busbar 122 extends forward to the position of the most forward connection hole 16, the neutral plate 14 extends forward to the position of the middle connection hole 16, and the positive plate 13 extends forward to the position of the most rearward connection hole 16. After that, the positive plate 13, the neutral plate 14 and the negative plate 15 in the second busbar 122 can be respectively passed through the corresponding connection holes 16 and connected to the plates of the same polarity on the first busbar 121 through the conductive connector.

[0060] Alternatively, in other embodiments, the plates of the first busbar 121 and the second busbar 122 include a positive plate 13, a neutral plate 14 and a negative plate 15 according to different polarities; the first busbar 121 is stacked in sequence from far to near as a negative plate 15, a neutral plate 14 and a positive plate 13 according to the distance from the first mounting surface 211; the second busbar 122 is stacked in sequence from far to near as a positive plate 13, a neutral plate 14 and a negative plate 15 according to the distance from the second mounting surface 212; the first switch 222 is connected to the negative plate 15 and the neutral plate 14 of the first busbar 121 through a wiring component 23; the second switch 223 is connected to the positive plate 13 and the neutral plate 14 of the second busbar 122 through a wiring component 23. In the configuration of the capacitor busbar 12 arrangement method that is the same as the above-mentioned embodiment, the plates on the first busbar 121 are respectively the positive plate 13, the neutral plate 14 and the negative plate 15 from top to bottom, and the plates on the second busbar 122 are respectively the positive plate 13, the neutral plate 14 and the negative plate 15 from front to back.

[0061] Since the first switch 222 and the second switch 223 are actually only connected to the plates of two polarities in the capacitor busbar 12, the stacking relationship of the plates of different polarities on the first busbar 121 and the second busbar 122 can be adjusted according to the specific settings of the first switch 222 and the second switch 223, and the plates of corresponding polarities can be set closer to the corresponding first switch 222 or the second switch 223. In this way, when the first switch 222 or the second switch 223 is connected to the capacitor busbar 12 through the wiring component 23, it only needs to pass through the two closest layers of plates at most, which reduces the difficulty of processing and assembly. In addition, since there is one less layer of plate to pass through, the current carrying capacity of the plate will also be improved, and the overall commutation circuit of the power tube group 22 and the capacitor busbar 12 will be further shortened, further reducing the overall stray inductance.

[0062] As another aspect of the power component involved in the embodiment of the present invention, the wiring component 23 includes a first wiring component 231 and a second wiring component 232; the first wiring component 231 connects each of the first switches 222 and the first busbar 121; the second wiring component 232 connects each of the second switches 223 and the second busbar 122. Among them, the first wiring component 231 includes a first busbar 2311 and a second busbar 2312 arranged in layers; each of the first switches 222 is arranged along the first direction on the first mounting surface 211; the first busbar 2311 and the second busbar 2312 both extend in the first direction and are connected to each of the first switches 222. The second wiring component 232 includes a third busbar 2321 and a fourth busbar 2322 arranged in layers; each of the second switches 223 is arranged along the first direction on the second mounting surface 212; the third busbar 2321 and the fourth busbar 2322 both extend in the first direction and are connected to each of the second switches 223. The first wiring assembly 231 includes a first busbar 2311 and a second busbar 2312 arranged in layers, which are used to connect the first switch 222 and the first busbar 121, and the first busbar 2311 and the second busbar 2312 are of a flat and wide structure, which can improve the current carrying capacity, and the stacking of the first busbar 2311 and the second busbar 2312 can further reduce the stray inductance between the first switch 222 and the first busbar 121. The second wiring assembly 232 includes a third busbar 2321 and a fourth busbar 2322 arranged in layers, which are used to connect the second switch 223 and the second busbar 122, and the third busbar 2321 and the fourth busbar 2322 are of a flat and wide structure, which can improve the current carrying capacity, and the stacking of the first busbar 2311 and the second busbar 2312 can further reduce the stray inductance between the second switch 223 and the second busbar 122.

[0063] Among them, refer to Figure 5 , Figure 8 and Fig. 9, the first busbar 2311 and the second busbar 2312 both have a first connection portion 2313 and a second connection portion 2314; the first connection portion 2313 connects the first switches 222, and the plane where the first connection portion 2313 is located is parallel to the first mounting surface 211; the second connection portion 2314 connects the first busbar 121, and the plane where the first connection portion 2314 is located is perpendicular to the first mounting surface 211. The third busbar 2321 and the fourth busbar 2322 both have a third connection portion 2323, a fourth connection portion 2324 and a transition portion 2325; the third connection portion 2323 connects the second switches 223, and the plane where the first connection portion 2324 is located is parallel to the second mounting surface 212; the fourth connection portion 2324 connects the second busbar 122, and the plane where the first connection portion 2324 is located is parallel to the second mounting surface 212; the transition portion 2325 connects the third connection portion 2323 and the fourth connection portion 2324, and the plane where the first connection portion 2324 is located is perpendicular to the second mounting surface 212. The first connection part 2313 and the second connection part 2314 on the first busbar 2311 and the second busbar 2312 are perpendicular to each other, adapted to the configuration that the first mounting surface 211 and the first busbar 121 are perpendicular to each other, which can shorten the connection distance between the first switch 222 and the first busbar 121, shorten the length of the commutation loop between the first switch 222 and the first busbar 121, and reduce the stray inductance. The third connection part 2323 and the fourth connection part 2324 on the third busbar 2321 and the fourth busbar 2322 are parallel to each other, adapted to the configuration that the second mounting surface 212 and the second busbar 122 are parallel to each other, and at the same time, the third connection part 2323 and the fourth connection part 2324 are connected by the turning part 2325, ensuring that the second switch 223 and the second busbar 122 have the shortest connection distance, thereby reducing the stray inductance.

[0064] Specifically, refer to Figure 5 In order to connect each first switch 222 to the first busbar 121 and each second switch 223 to the second busbar 122, the wiring component 23 is divided into two independent first wiring components 231 and second wiring components 232. The first busbar 2311 and the second busbar 2312 in the first wiring component 231 are respectively connected to the first switch terminal 2211 and the second switch terminal 2211 of each first switch 222, and then respectively connected to the positive plate 13 and the neutral plate 14 in the first busbar 121. The third busbar 2321 and the fourth busbar 2322 in the second wiring component 232 are respectively connected to the first switch terminal 2211 and the second switch terminal 2211 of each second switch 223, and then respectively connected to the negative plate 15 and the neutral plate 14 in the second busbar 122. In order to further reduce the stray inductance generated in the commutation circuit, the first busbar 2311 and the second busbar 2312 are copper buses arranged in layers, and the third busbar 2321 and the fourth busbar 2322 are also copper buses arranged in layers, and an insulating layer is provided between adjacent busbars.

[0065] In order to adapt the spatial position relationship between the first busbar 121, the second busbar 122 and the mounting base 21, the shape and structure of the busbars in the first wiring assembly 231 and the second wiring assembly 232 have their own characteristics. In the first wiring assembly 231, the first busbar 2311 and the second busbar 2312 are both long strip-shaped components extending in the left-right direction, and the first busbar 2311 and the second busbar 2312 are both provided with a first connecting portion 2313 extending in the up-down direction and a second connecting portion 2314 extending in the front-back direction. Among them, there are intervals between the first connecting portions 2313, and there are also intervals between the second connecting portions 2314, and the intervals between the first connecting portions 2313 in the first busbar 2311 just correspond to the positions of the first connecting portions 2313 in the second busbar 2312, and the intervals between the second connecting portions 2314 in the first busbar 2311 just correspond to the positions of the second connecting portions 2314 in the second busbar 2312. With such arrangement, when the first busbar 2311 and the second busbar 2312 are stacked together, the connection portion of one of them will correspond to the interval of the other. This is because the two switch terminals 2211 on each first switch 222 are in the same plane, and the pole plates on the first busbar 121 are stacked. Only by staggering the first busbar 2311 and the second busbar 2312 can the connection between the first busbar 2311 and the second busbar 2312 and the first switch 222 and the first busbar 121 not interfere with each other. In order to eliminate the influence of the height difference between the first busbar 2311 and the second busbar 2312 on the wiring, a conductive connection column 24 is also provided. The connection column 24 can be used to connect the first connection portion 2313 and the second connection portion 2314 of the first busbar 2311 and the second busbar 2312 to the switch terminal 2211 of the first switch 222 and the pole plate of the first busbar 121.

[0066] In the second wiring assembly 232, the third busbar 2321 and the fourth busbar 2322 are also long strip-shaped components extending in the left-right direction, and the third busbar 2321 and the fourth busbar 2322 are provided with a third connection portion 2323 and a fourth connection portion 2324 extending in the up-down direction, and a turning portion 2325 extending in the front-back direction. There are intervals between the third connection portions 2323, and there are intervals between the fourth connection portions 2324. The intervals between the third connection portions 2323 in the third busbar 2321 just correspond to the positions of the third connection portions 2323 in the fourth busbar 2322, and the intervals between the fourth connection portions 2324 in the third busbar 2321 just correspond to the positions of the fourth connection portions 2324 in the third busbar 2321. The turning portion 2325 plays a role in connecting the third connection portion 2323 and the fourth connection portion 2324, and can be regarded as a complete strip. With such arrangement, when the third busbar 2321 and the fourth busbar 2322 are stacked together, the connection portion of one of them will correspond to the interval of the other. This is because the two switch terminals 2211 on each second switch 223 are in the same plane, and the plates on the first busbar are stacked. Only by staggering the third busbar 2321 and the fourth busbar 2322 can the connection between the third busbar 2321 and the fourth busbar 2322 and the second switch 223 and the second busbar 122 not interfere with each other. In order to eliminate the influence of the height difference between the third busbar 2321 and the fourth busbar 2322 on the wiring, a conductive connection column 24 is also provided. The connection column 24 can be used to connect the third connection portion 2323 and the fourth connection portion 2324 of the third busbar 2321 and the fourth busbar 2322 to the switch terminal 2211 of the second switch 223 and the plate of the second busbar 122.

[0067] In addition, an embodiment of the present invention also relates to a liquid-cooled converter, which includes a converter cabinet, in which the power components described above are installed; the mounting base 21 is a liquid-cooled radiator.

[0068] Specifically, the liquid-cooled inverter may also include a liquid cooling unit, and the mounting base 21 serves as a liquid cooling radiator, wherein a plurality of liquid cooling channels are arranged inside the liquid cooling unit, wherein the liquid cooling channels have flowing coolant, and the mounting base 21 is also connected to the liquid cooling unit through a liquid cooling pipe, wherein the coolant can circulate between the liquid cooling unit and the mounting base 21 through the liquid cooling pipe, and dissipate heat at the position of the liquid cooling unit to cool down, and absorb heat at the position of the mounting base 21 to heat up, thereby achieving cooling and heat dissipation of the power tube group 22 in the power component through the circulation of the coolant.

[0069] At the same time, since the liquid-cooled converter adopts the above-mentioned power components, it has the advantage of low overall stray inductance.

[0070] The description of the above specification and embodiments is used to explain the protection scope of the present invention, but does not constitute a limitation on the protection scope of the present invention. Through the enlightenment of the present invention or the above embodiments, ordinary technicians in this field can obtain modifications, equivalent substitutions or other improvements to the embodiments of the present invention or part of the technical features thereof through logical analysis, reasoning or limited experiments, which should be included in the protection scope of the present invention.

Claims

1. A power component, characterized in that: include: A capacitor module (10) comprises a DC capacitor pool (11) and a capacitor busbar (12) connected to each other; the DC capacitor pool (11) comprises a first capacitor pool (111) and a second capacitor pool (112), and the capacitor busbar (12) comprises a first busbar (121) and a second busbar (122); the first capacitor pool (111) is connected to the first busbar (121), and the second capacitor pool (112) is connected to the second busbar (122); the planes where the first busbar (121) and the second busbar (122) are located intersect or are parallel, and both of them comprise a plurality of plates with different polarities, and the plates with the same polarity in the two are connected to each other; a power module (20) comprises a mounting base (21), a power tube group (22) and a wiring component (23); the mounting base (21) has a first mounting surface (211) and a second mounting surface (212) which are separated from each other. ), wherein the first mounting surface (211) is closer to the first busbar (121) relative to the second mounting surface (212), and the second mounting surface (212) is closer to the second busbar (122) relative to the first mounting surface (211); the power tube group (22) comprises a plurality of switch devices (221), wherein some of the switch devices (221) are connected to the capacitor busbar (12) via a wiring component (23), and are divided into first switches (222) and second switches (223) according to the connection relationship with the plates of different polarities on the capacitor busbar (12); each of the first switches (222) is located on the first mounting surface (211) and is connected to the first busbar (121) via the wiring component (23), and each of the second switches (223) is located on the second mounting surface (212) and is connected to the second busbar (122) via the wiring component (23).

2. A power component as claimed in claim 1, characterized in that: The planes on which the first busbar (121) and the second busbar (122) are located are perpendicular to each other; the first mounting surface (211) of the mounting base (21) is perpendicular to the plane on which the first busbar (121) is located, and the second mounting surface (212) is parallel to the plane on which the second busbar (122) is located.

3. A power component as claimed in claim 2, characterized in that: The plates of the first busbar (121) and the second busbar (122) include a positive plate (13), a neutral plate (14) and a negative plate (15) according to different polarities; the first busbar (121) is installed so that the distance from the first installation surface (211) is stacked in sequence as a positive plate (13), a neutral plate (14) and a negative plate (15); the second busbar (122) is installed so that the distance from the second installation surface (212) is stacked in sequence as a negative plate (15), a neutral plate (14) and a positive plate (13); the first switch (222) is connected to the positive plate (13) and the neutral plate (14) of the first busbar (121) through a wiring component (23); and the second switch (223) is connected to the negative plate (15) and the neutral plate (14) of the second busbar (122) through a wiring component (23).

4. A power component as claimed in claim 2, characterized in that: The plates of the first busbar (121) and the second busbar (122) include a positive plate (13), a neutral plate (14) and a negative plate (15) according to different polarities; the first busbar (121) is stacked in sequence from far to near as a negative plate (15), a neutral plate (14) and a positive plate (13); the second busbar (122) is stacked in sequence from far to near as a positive plate (13), a neutral plate (14) and a negative plate (15); the first switch (222) is connected to the negative plate (15) and the neutral plate (14) of the first busbar (121) through a wiring component (23); and the second switch (223) is connected to the positive plate (13) and the neutral plate (14) of the second busbar (122) through a wiring component (23).

5. A power component as claimed in claim 3 or 4, characterized in that: The wiring component (23) comprises a first wiring assembly (231) and a second wiring assembly (232); the first wiring assembly (231) connects each of the first switches (222) and the first busbar (121); and the second wiring assembly (232) connects each of the second switches (223) and the second busbar (122).

6. A power component as claimed in claim 5, characterized in that: The first wiring assembly (231) comprises a first busbar (2311) and a second busbar (2312) which are stacked; each of the first switches (222) is arranged along a first direction on the first mounting surface (211); the first busbar (2311) and the second busbar (2312) both extend along the first direction and are connected to each of the first switches (222).

7. A power component as claimed in claim 6, characterized in that: The first busbar (2311) and the second busbar (2312) both have a first connecting portion (2313) and a second connecting portion (2314); the first connecting portion (2313) is connected to each of the first switches (222), and the plane where the first connecting portion (2313) is located is parallel to the first mounting surface (211); the second connecting portion (2314) is connected to the first busbar (121), and the plane where the second connecting portion (2314) is located is perpendicular to the first mounting surface (211).

8. A power component as claimed in claim 5, characterized in that: The second wiring assembly (232) comprises a third busbar (2321) and a fourth busbar (2322) arranged in a stacked manner; each of the second switches (223) is arranged along a first direction on the second mounting surface (212); the third busbar (2321) and the fourth busbar (2322) both extend along the first direction and are connected to each of the second switches (223).

9. A power component as claimed in claim 8, characterized in that: The third busbar (2321) and the fourth busbar (2322) both have a third connecting portion (2323), a fourth connecting portion (2324) and a turning portion (2325); the third connecting portion (2323) is connected to each of the second switches (223), and the plane where the third connecting portion (2323) is located is parallel to the second mounting surface (212); the fourth connecting portion (2324) is connected to the second busbar (122), and the plane where the fourth connecting portion (2324) is located is parallel to the second mounting surface (212); the turning portion (2325) connects the third connecting portion (2323) and the fourth connecting portion (2324), and the plane where the third connecting portion (2323) is located is perpendicular to the second mounting surface (212).

10. A liquid-cooled converter, comprising a converter cabinet, characterized in that: The converter cabinet is provided with a power component as claimed in any one of claims 1 to 9; the mounting base (21) is a liquid-cooled radiator.

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