A power assembly and a power converter

Abstract

The application discloses a power assembly and a converter, wherein the power assembly comprises: a capacitor module, which comprises a direct-current capacitor bank and a capacitor busbar; the direct-current capacitor bank comprises a first capacitor array and a second capacitor array, the first capacitor array and the second capacitor array each comprise a plurality of capacitors, and the two are respectively located at an upper side position and a lower side position of the capacitor busbar along a vertical direction; and a power module, which comprises a power tube group and a wiring component; the power tube group is used for realizing electric energy conversion; the wiring component is used for connecting the power tube group and the capacitor busbar, and is located between the first capacitor array and the second capacitor array with respect to a power taking part of the capacitor busbar. The power assembly can improve the problems of high stray inductance and large current ripple of capacitors in the existing power assembly.

Description

TECHNICAL FIELD

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

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

[0003] Conventionally, the converter mainly includes a power assembly, which is used for realizing bidirectional conversion of DC and AC. The power assembly in the converter generally includes a DC module and a power module. The DC module mainly includes a DC capacitor bank and a capacitor busbar, and the power module mainly includes a power tube group and a heat sink. The power tube group is installed on the heat sink, and then connected with the DC busbar through an input bus. Specifically, referring to Figure 1 which shows the structure of the power assembly in the converter in the prior art. The power assembly can include a capacitor busbar 01, a DC capacitor bank 02, an input bus 03, a power tube group 04, an output bus 05, and a heat sink 06. The input bus 03, the power tube group 04, and the output bus 05 form the above-mentioned power module. The power tube group 04 is installed on the heat sink 06, and the heat sink 06 is a air-cooled heat sink with heat dissipation fins on the back, so the input bus 03, the power tube group 04, and the output bus 05 are installed on the front of the heat sink 06. Since the output of the power device is three-phase AC, the power module includes three power tube groups 04 and three corresponding heat sinks 06. Each power tube group 04 is installed on a heat sink 06, and the input buses 03 in the three power modules are connected to the capacitor busbar 01. Further, the capacitor busbar 01 includes positive plates, negative plates, and neutral plates, which are stacked and separated from each other by insulation plates. Correspondingly, the input bus 03 in each power module also includes positive plates, negative plates, and neutral plates, which are connected to the plates in the capacitor busbar 01.

[0004] Referring to Figure 2Fig. 1 shows a circuit diagram of a three-level topology in the prior art. For a power assembly adopting the three-level topology, the power tube group 04 in each complete three-level topology generally includes three IGBT devices, corresponding to Figure 2 The circuit shown in the figure, tube 1 and tube 2 are an input tube, tube 3 and tube 4 are an input tube, tube 5 and tube 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 tube 1 and tube 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 tube 3 and tube 4 are connected and then connected to the first end of tube 6; the second ends of tube 5 and tube 6 are connected to the output busbar.

[0005] Referring to Figure 1 , the DC capacitor cells are arranged and installed in a rectangular array on the capacitor busbar, and the positions where the three power modules are connected to the capacitor busbar are all located above, resulting in that the capacitors located at the lower side of the capacitor busbar are too far away from the power module power taking point, which can cause the commutation loop to be too long and the stray inductance to increase; at the same time, the capacitors located at the upper side of the capacitor busbar are too close to the power module power taking point, which can cause the current ripple of the capacitors to be too large and the temperature to be too high. SUMMARY

[0006] The purpose of the present application is to overcome the above-mentioned defects or problems existing in the background art, and to provide a power assembly and a converter which can improve the problems of high stray inductance and large current ripple of capacitors in the existing power assembly.

[0007] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0008] A power assembly comprises: a capacitor module comprising DC capacitor cells and a capacitor busbar; the DC capacitor cells comprise a first capacitor array and a second capacitor array, the first capacitor array and the second capacitor array each comprise a plurality of capacitors, and the two are located at the upper side and the lower side of the capacitor busbar respectively along the up-down direction; and a power module comprising a power tube group and a wiring component; the power tube group is used to realize power conversion; the wiring component is used to connect the power tube group and the capacitor busbar, and is located between the first capacitor array and the second capacitor array with the power taking part of the capacitor busbar.

[0009] Further, the first capacitor array and the second capacitor array are arranged in a rectangular array, and the number and arrangement of the capacitors are the same.

[0010] Further, in the first capacitor array and the second capacitor array, the unit number of capacitors in the up-down direction is less than the unit number of capacitors in the left-right direction.

[0011] Further, the capacitor busbar comprises a first polar plate, a second polar plate and a third polar plate which are stacked; two ends of the first capacitor array are connected to the first polar plate and the second polar plate respectively; two ends of the second capacitor array are connected to the second polar plate and the third polar plate respectively.

[0012] Further, the wiring component comprises a first wiring unit connected to the first polar plate, a second wiring unit connected to the second polar plate and a third wiring unit connected to the third polar plate; the first wiring unit is close to the first capacitor array at the power taking part of the capacitor busbar; the third wiring unit is close to the second capacitor array at the power taking part of the capacitor busbar.

[0013] Further, the first wiring unit, the second wiring unit and the third wiring unit are continued with the power taking part of the capacitor busbar in the left-right direction.

[0014] Further, the power module further comprises at least one mounting base; a surface of the mounting base away from the capacitor busbar forms a mounting surface which is parallel to the capacitor busbar; the power tube group is fixed to the mounting surface; the first wiring unit, the second wiring unit and the third wiring unit are wiring rows which are stacked.

[0015] Further, the power module further comprises at least one mounting base; the mounting base forms two mounting surfaces which are away from each other and are both parallel to the capacitor busbar; the power tube group comprises at least one single-phase switch tube group; each single-phase switch tube group comprises a plurality of switch modules; each switch module comprises a first input tube, a second input tube and an output tube; the first input tube is located at the mounting surface away from the capacitor busbar, and the second input tube is located at the mounting surface facing the capacitor busbar; the first wiring unit is a wiring row which is connected to the first wiring end in the first end of the first input tube; the second wiring unit comprises a wiring row and a plurality of wiring columns; the wiring row is stacked with the first wiring unit and is connected to the second wiring end in the first end of each first input tube; each wiring column is connected to the first wiring end in the first end of each second input tube; the third wiring unit is a plurality of wiring columns which are connected to the second wiring end in the second end of each second input tube.

[0016] Further, the input end of the capacitor busbar and the output end of the power module are located at positions away from each other in the up-down direction.

[0017] In addition, the application further provides a converter which comprises the power assembly according to any one of the above.

[0018] From the above description of the application, the application has the following beneficial effects compared with the prior art:

[0019] 1. The power assembly provided by the application, the wiring components in the power module and the power taking part of the capacitor busbar are arranged between the first capacitor array and the second capacitor array on the capacitor busbar, that is, the DC capacitor cells originally located on the same side of the power taking part are divided into two parts and arranged on both sides of the power taking part, so that under the same or similar size of the capacitor busbar, the capacitors at the two positions are closest to the power taking part, the capacitors at the two positions can disperse the capacitor ripple of the power module and reduce the overall temperature of the capacitors, the capacitors at the position farthest from the power taking part are also closer to the power taking part compared with the conventional way, so that the commutation loop can be shortened and the overall stray inductance can be reduced; thus, through the above technical means, the problems of high stray inductance and large current ripple caused by the arrangement of DC capacitor cells in the existing power assembly are improved, and the stray inductance of the power assembly and the capacitor ripple of the DC capacitor cells are reduced without increasing the size of the capacitor busbar.

[0020] 2. The capacitors are arranged in a rectangular array, which can ensure that the capacitors arranged in the left-right direction in the same row are equidistant from the power taking part in the up-down direction, and the number of capacitors in each row is consistent, so that the current ripple gradually decreases according to the distance of the capacitors in different rows from the power taking part, thereby avoiding excessive capacitors near the power taking part, which can cause excessive current ripple, and avoiding excessive capacitors far from the power taking part, which can cause excessive overall stray inductance; and the number and arrangement of capacitors in the first capacitor array and the second capacitor array are the same, so that the first capacitor array and the second capacitor array have the same effect on stray inductance and current ripple, the stray inductance and current ripple are evenly distributed to the first and second capacitor arrays, and the overall electrical balance performance of the power assembly is better.

[0021] 3. The unit number of capacitors in the up-down direction is less than the unit number of capacitors in the left-right direction, that is, the number of capacitors in the left-right direction is more than the number of capacitors in the up-down direction, so that the distance between the capacitors farthest from the power taking part and the power taking part can be greatly reduced, and the overall stray inductance can be reduced; at the same time, the number of capacitors near the power taking part can be increased to disperse the current ripple to more capacitors and reduce the influence of the current ripple on the capacitors.

[0022] 4. The capacitor busbar is provided with stacked first, second and third plates, the first capacitor array is connected between the first plate and the second plate, and the second capacitor array is connected between the second plate and the third plate, so that the two capacitors in the three-level topology circuit structure are separated in the actual space; this separated structure can facilitate the connection between the capacitor busbar and the capacitors, and the wiring parts on the capacitor busbar for connecting the capacitors can be centrally arranged on the corresponding plates corresponding to the first capacitor array and the second capacitor array.

[0023] 5. The wiring components include first, second and third wiring units, which are respectively connected to the first, second and third plates on the capacitor busbar. The power taking part of the first wiring unit is close to the first capacitor array, and the power taking part of the third wiring unit is close to the second capacitor array. This allows the corresponding power transistor group in the circuit to be closer to the corresponding capacitor in space, thereby reducing circuit loss and improving the operating efficiency of the power components.

[0024] 6. The power take-off sections of the first, second, and third wiring units continue in the left-right direction, and the capacitors in the capacitor module are also arranged in the left-right direction. Therefore, the distance between the power take-off section corresponding to the same wiring unit and the capacitor in the same row is equal. Only by adjusting the arrangement of the capacitors can the overall stray inductance be improved and the current ripple of the capacitors be reduced.

[0025] 7. The first, second and third wiring units are set as stacked terminal blocks. The power taking parts of the three units can be arranged sequentially on the capacitor busbar in the vertical direction. The terminal blocks can collect electrical energy, which facilitates the wiring between the power module and the capacitor module.

[0026] 8. The first wiring unit uses a terminal block, the second wiring unit uses a terminal block and a terminal post, and the third wiring unit uses a terminal post. This can be matched with the arrangement of the switching transistors in the power module. Switching transistors close to the capacitor busbar can be connected using terminal posts, while switching transistors far from the capacitor busbar can be connected using stacked terminal blocks. Stacked terminal blocks can reduce the stray inductance generated.

[0027] 9. The input terminal of the capacitor busbar and the output terminal of the power module are placed vertically. When the power component is installed in the converter, the overall wiring of the power component is more spatially smooth and can avoid mutual interference of the lines. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments are briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0030] Figure 2 The circuit diagram is shown in the background section, representing a three-level topology.

[0031] Figure 3 A schematic diagram of the power component provided in Embodiment 1 of the present invention. Figure 1 ;

[0032] Figure 4 forFigure 1 Front view of medium power assembly

[0033] Figure 5 For Figure 1 Structure diagram of medium power assembly Figure 2 ;

[0034] Figure 6 For Figure 1 Partial structure diagram of medium power assembly Figure 1 ;

[0035] Figure 7 For Figure 1 Partial structure diagram of medium power assembly Figure 2 .

[0036] Explanation of main reference signs:

[0037] Capacitor module 10; capacitor busbar 11; first pole plate 111; second pole plate 112; third pole plate 113; first capacitor array 12; second capacitor array 13; capacitor 14; capacitor busbar input end 15;

[0038] Power module 20; power tube group 21; first input tube 211; second input tube 212; output tube 213; wiring component 22; first wiring unit 221; second wiring unit 222; first part of second wiring unit 2221; second part of second wiring unit 2222; third wiring unit 223; mounting base 23; total power taking part 24; first power taking part 241; second power taking part 242; third power taking part 243; output end of power tube group 25. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are the preferred embodiments of the present application, and should not be seen as excluding other embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0040] In the claims, specification, and above drawings of the present application, unless otherwise explicitly limited, the use of the terms "first", "second", or "third" etc. is intended to distinguish different objects, and is not intended to describe a particular order.

[0041] In the claims, the specification, and the drawings of the present application, terms such as "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. are used as terms of reference, and are merely intended to facilitate the description of the present application and the simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the specific protection scope of the present application.

[0042] In the claims, the specification, and the drawings of the present application, unless otherwise expressly defined, the term "fixedly connected" or "fixedly connected" should be understood in a broad sense, that is, any connection mode between the two without displacement relationship and relative rotation relationship, that is, it includes irremovable fixed connection, removable fixed connection, integration and fixed connection through other devices or elements.

[0043] In the claims, the specification, and the drawings of the present application, the terms "include", "have" and their variants are intended to mean "contain but not limited to".

[0044] Embodiment 1

[0045] Referring to Figure 3 , the power assembly provided by Embodiment 1 of the present application mainly comprises a capacitor module 10 and a power module 20. The capacitor module 10 comprises a DC capacitor bank and a capacitor busbar 11, and the power module 20 comprises a power tube group 21, a wiring component 22 and a mounting base 23.

[0046] Referring to Figure 3 , the DC capacitor bank in the capacitor module 10 comprises a first capacitor array 12 and a second capacitor array 13, both of which comprise a plurality of capacitors 14, and both of which are located at the upper side and the lower side of the capacitor busbar 11 along the up-down direction. The up-down direction here refers to the direction indicated by the arrow in Figure 3 , which also shows the front-back, left-right and other directions referred to in the specification and claims of the present application.

[0047] Referring to Figure 3 and Figure 7The capacitor busbar 11 of the capacitor module 10 comprises a first polar plate 111, a second polar plate 112 and a third polar plate 113 which are stacked in sequence. In the front-to-back direction, the first polar plate 111 is located at the frontmost position, the third polar plate 113 is located at the rearmost position, and the second polar plate 112 is located in the middle. The capacitors 14 in the DC capacitor bank are all fixed on the front side of the capacitor busbar 11. The capacitors 14 are all cylindrical members, and their bottoms are connected with the capacitor busbar 11. In this embodiment, the first polar plate 111 is a positive polar plate, the second polar plate 112 is a neutral polar plate, and the third polar plate 113 is a negative polar plate.

[0048] With reference to Figure 3 At the upper end position of the capacitor busbar 11, three terminals are extended out respectively corresponding to the first polar plate 111, the second polar plate 112 and the third polar plate 113, and these three terminals form a capacitor busbar input end 15. The input end here refers to the input end through which the DC power is connected when the power assembly is used to convert DC power into AC power. It should be understood that when the power assembly is used to convert AC power into DC power, the capacitor busbar input end 15 will become the actual DC output end. Therefore, the capacitor busbar input end 15 is represented here only for the convenience of description, and does not mean that it can only be used as a power input.

[0049] Correspondingly, according to the three-level topology circuit structure shown in Figure 2 It can be seen that the capacitors 14 at two positions, i.e. between the positive pole and the neutral line and between the negative pole and the neutral line in the circuit, are thus divided into two parts in actual application, one part of which is connected to the first polar plate 111 and the second polar plate 112, and the other part of which is connected to the second polar plate 112 and the third polar plate 113. In this embodiment, the capacitors 14 at the two positions in the circuit are spatially corresponding to the first capacitor array 12 and the second capacitor array 13, that is, the two ends of the first capacitor array 12 are connected to the first polar plate 111 and the second polar plate 112 respectively, and the two ends of the second capacitor array 13 are connected to the second polar plate 112 and the third polar plate 113 respectively.

[0050] With reference to Figure 4, the first capacitor array 12 and the second capacitor array 13 are arranged in a rectangular array, and the number and arrangement of the capacitors 14 are the same. As described above, the first capacitor array 12 and the second capacitor array 13 each include a plurality of cylindrical capacitors 14 arranged in a rectangular array on the capacitor busbar 11, that is, in the up-down direction and the left-right direction, the capacitors 14 can be a unit by themselves to form a rectangular array in the form of x*y, and the first capacitor array 12 and the second capacitor array 13 are arranged in the form of x*y. Further, in the first capacitor array 12 and the second capacitor array 13, the number of units of the capacitors 14 in the up-down direction is less than the number of units in the left-right direction, that is, taking x as the left-right direction and y as the up-down direction, the value of x is greater than the value of y. For example, referring to Figure 4 In this embodiment, the first capacitor array 12 and the second capacitor array 13 are each a 7*3 rectangular array.

[0051] Referring to Figure 5 The power module 20 includes a power tube group 21, a wiring component 22, and at least one mounting base 23. The power tube group 21 is used to realize power conversion, such as converting direct current to alternating current or converting alternating current to direct current. Referring to Figure 4 and Figure 5 The wiring component 22 is used to connect the power tube group 21 and the capacitor busbar 11, and is located between the first capacitor array 12 and the second capacitor array 13.

[0052] Referring to Figure 5 and Figure 7 The mounting base 23 has two mounting surfaces that are opposite to each other and parallel to the capacitor busbar 11. The power tube group 21 includes at least one single-phase switch tube group, each single-phase switch tube group includes a plurality of switch modules, and each switch module includes a first input tube 211, a second input tube 212, and an output tube 213. The first input tube 211 is located on the mounting surface away from the capacitor busbar 11, and the second input tube 212 is located on the mounting surface facing the capacitor busbar 11. In this embodiment, the number of mounting bases 23 is one, which is a liquid cooling heat sink that can cool the power tube group 21 mounted thereon by liquid cooling. The power tube group 21 includes three single-phase switch tube groups corresponding to three-phase alternating current, each single-phase switch tube group includes three switch modules, and each switch module includes three switch tubes, which are the first input tube 211, the second input tube 212, and the output tube 213. Figure 2The first input tube 211 is tube 1 and tube 2, the second input tube 212 is tube 3 and tube 4, and the output tube 213 is tube 5 and tube 6. The first input tube 211 and the output tube 213 are located on the mounting surface of the front side of the mounting base 23, and the second input tube 212 is located on the mounting surface of the rear side of the mounting base 23. The first input tube 211 and the output tube 213 are connected by a connection row that passes through the mounting base 23. The output tube 213 in each single switch tube group is also connected to an output row that forms the power module output end 25. Of course, when the power module is used to convert AC to DC, the original power module output end 25 becomes the actual AC input end. Therefore, it is referred to as the power module output end 25 here, which is only for convenience of expression and does not mean that it can only be used as an electric energy output. Figure 4 In the embodiment, the capacitor busbar input end 15 and the power module output end 25 are located at positions away from each other in the up-down direction, that is, the capacitor busbar input end 15 is located at the upper end of the entire power module, and the power module output end 25 is located at the lower end of the entire power module.

[0053] The wiring component 22 includes a first wiring unit 221 connected to the first polar plate 111, a second wiring unit 222 connected to the second polar plate 112, and a third wiring unit 223 connected to the third polar plate 113. The first wiring unit 221 is close to the power taking part of the capacitor busbar 11 near the first capacitor array 12, and the third wiring unit 223 is close to the power taking part of the capacitor busbar 11 near the second capacitor array 13. Figure 4 In the specification and claims of the present application, the connection part of the wiring component 22 and the capacitor busbar 11 is referred to as the power taking part, that is, the power module 20 takes power from the capacitor busbar 11 through the power taking part. Figure 4 The total power taking part 24 formed when the wiring component 22 is connected to the capacitor busbar 11 is shown in FIG. 8. The total power taking part 24 includes three sub-power taking parts corresponding to different wiring units, but the three sub-power taking parts here do not correspond to the three wiring units one-to-one. Among them, Figure 4 The first power taking part 241 corresponds to the first wiring unit 221, the second power taking part 242 corresponds to part of the second wiring unit 222, and the third power taking part 243 corresponds to the remaining part of the second wiring unit 222 and the entire third wiring unit 223. The correspondence relationship is related to the structure of the actual wiring unit.

[0054] However, the total power taking part 24 of the wiring part 22 is located between the first capacitor array 12 and the second capacitor array 13, and the first power taking part 241 is arranged close to the first capacitor array 12, and the part of the third power taking part 243 corresponding to the third wiring unit 223 is arranged close to the second capacitor array 13. And, the first wiring unit 221, the second wiring unit 222 and the third wiring unit 223 are continued with the power taking parts of the capacitor busbar 11 in the left-right direction, where the continuation refers to the arrangement in the left-right direction regardless of whether the power taking parts are continuous or discontinuous.

[0055] Specifically, referring to Figure 6 , the first wiring unit 221 is a wiring row, which is connected with the first wiring end in the first end of the first input tube 211, that is, the first wiring unit 221 is connected with the tube 1; the second wiring unit 222 includes a wiring row and a plurality of wiring columns, where the wiring row is arranged in a stack with the first wiring unit 221, and is connected with the second wiring end in the first end of each first input tube 211, that is, the wiring row in the second wiring unit 222 is connected with the tube 2; each wiring column in the second wiring unit 222 is connected with the first wiring end in the first end of each second input tube 212, that is, each wiring column in the second wiring unit 222 is connected with the tube 3; the third wiring unit 223 is a plurality of wiring columns, which are connected with the third wiring end in the second end of each second input tube 212, that is, each wiring column in the third wiring unit 223 is connected with the tube 4. Referring to Figure 6 , the second wiring unit 222 is divided into a first part 2221 and a second part 2222, where the first part 2221 is a wiring row, which is arranged in a stack with the wiring row forming the first wiring unit 221, and both are connected to the first input tube 211 on the front side of the mounting base 23 by means of bending; the second part 2222 is a wiring column, which corresponds to each second wiring end in the first end of the second input tube 212, has a consistent number of wiring columns, and each wiring column is connected with a second wiring end and a second polar plate 112 of the capacitor busbar 11; and the wiring columns of the second part 2222 are arranged in a group with the wiring columns of the third wiring unit 223 corresponding to one second input tube 212 in the left-right direction. Therefore, in the third power taking part 243, there is a part corresponding to the second part 2222 of the second wiring unit, and there is also a part corresponding to the third wiring unit 223.

[0056] The power assembly provided by the embodiment is characterized in that the wiring component 22 in the power module 20 and the power taking part of the capacitor busbar 11 are arranged between the first capacitor array 12 and the second capacitor array 13 on the capacitor busbar 11, that is, the DC capacitor cells originally located on the same side of the power taking part are divided into two parts and arranged on the two sides of the power taking part, so that the capacitors 14 at the two positions closest to the power taking part are closest to the power taking part in the same or similar size of the capacitor busbar 11, the capacitors 14 at the two positions can disperse the capacitor ripple of the power module 20 and reduce the overall temperature of the capacitors 14, and the capacitors 14 at the position farthest from the power taking part are closer to the power taking part than in the conventional way, so that the commutation loop can be shortened and the overall stray inductance can be reduced. Thus, by means of the above technical means, the problems of high stray inductance and large current ripple caused by the arrangement of DC capacitor cells in the existing power assembly are solved, the stray inductance of the power assembly and the capacitor ripple of the DC capacitor cells are reduced without increasing the size of the capacitor busbar 11, and the capacitors 14 are arranged in a rectangular array, which can ensure that the capacitors 14 arranged in the left-right direction in the same row are equidistant from the power taking part in the up-down direction, and the number of capacitors 14 in each row is consistent, so that the current ripple gradually decreases according to the distance of the capacitors 14 in different rows from the power taking part, thereby avoiding excessive number of capacitors 14 due to excessive current ripple caused by arranging too many capacitors 14 close to the power taking part, and avoiding excessive stray inductance caused by arranging too many capacitors 14 far from the power taking part. Furthermore, the number and arrangement of the capacitors 14 in the first capacitor array 12 and the second capacitor array 13 are the same, so that the first capacitor array 12 and the second capacitor array 13 have the same effect on the stray inductance and the current ripple, the stray inductance and the current ripple are evenly distributed to the first capacitor array 12 and the second capacitor array 13, and the overall electrical balance performance of the power assembly is better.

[0057] In addition, the capacitors in the power assembly are divided into two parts separated in space, and a space is formed between the two parts. When the power assembly is applied to an actual device, a fan can be used to blow air to the part between the two parts, and the air flow can be guided by the capacitor busbar to be delivered to the two capacitor arrays respectively, so as to cool and evenly heat the two capacitor arrays. Compared with the arrangement structure of only one concentrated capacitor array, the arrangement of the capacitors in the above-mentioned power assembly is more conducive to the cooling and temperature equalization of the capacitors.

[0058] Embodiment 2

[0059] Embodiment 2 is based on embodiment 1, and the difference lies in that the arrangement of the power tube group 21 on the mounting base 23 and the actual structure of the wiring component 22 are different.

[0060] In this embodiment, on the surface of the mounting base 23 facing away from the capacitor busbar 11, a mounting surface parallel to the capacitor busbar 11 is formed, that is, this mounting surface is located on the front surface of the mounting base 23; the power transistor group 21 is fixed on the mounting surface. Among them, the power transistor group 21 includes at least one single-phase switch transistor group, each single-phase switch transistor group includes several switch modules, and each switch module includes a first input transistor 211, a second input transistor 212 and an output transistor 213. Among them, the first input transistor 211 is located on the mounting surface facing away from the capacitor busbar 11, and the second input transistor 212 is located on the mounting surface facing the capacitor busbar 11. In this embodiment, the number of mounting bases 23 is one, which is a liquid-cooled heat dissipation plate, and the power transistor group 21 mounted on it can be cooled by liquid cooling. The power transistor group 21 includes three single-phase switch transistor groups, corresponding to three-phase alternating current respectively. Each single-phase switch transistor group includes three switch modules, and each switch module includes three switch transistors, which are the first input transistor 211, the second input transistor 212 and the output transistor 213 respectively. Refer to Figure 2 , the first input transistor 211 is transistor 1 and transistor 2 among them, the second input transistor 212 is transistor 3 and transistor 4 among them, and the output transistor 213 is transistor 5 and transistor 6 among them. Among them, the three switch transistors are all located on the mounting surface on the front side of the mounting base 23, and the three switch transistors are arranged in an inverted "pin" shape, and the arrangement method shown in Figure 1 can be referred to.

[0061] In this embodiment, the first wiring unit 221, the second wiring unit 222 and the third wiring unit 223 are stacked wiring bars, and the connection parts of the three with the capacitor busbar 11 form three power-taking parts arranged in the up-down direction. Among them, the power-taking part corresponding to the first wiring unit 221 is located at the upper side position close to the first capacitor array 12, the power-taking part corresponding to the third wiring unit 223 is located at the lower side position close to the second capacitor array 13, and the power-taking part corresponding to the second wiring unit 222 is located between the two.

[0062] Embodiment 3

[0063] Embodiment 3 provides an inverter, which includes a housing and a power component arranged in the housing, and the power component therein adopts the power component provided in Embodiment 1 or Embodiment 2.

[0064] The descriptions of the above specification and embodiments are used to explain the protection scope of the present invention, but do not constitute a limitation to the protection scope of the present invention. Through the inspiration of the present invention or the above embodiments, those of ordinary skill in the art combine well-known common sense, ordinary technical knowledge in the art and / or existing technologies, and through logical analysis, reasoning or limited experiments, modifications, equivalent replacements or other improvements to the embodiments of the present invention or some of its technical features can be obtained, and all should be included within the protection scope of the present invention.

Claims

1. A power component, characterized in that, include: A capacitor module (10) includes a DC capacitor bank and a capacitor busbar (11); the DC capacitor bank includes a first capacitor array (12) and a second capacitor array (13), each of which includes several capacitors (14), and they are located on the upper and lower sides of the capacitor busbar (11) respectively in the vertical direction; and A power module (20) includes a power transistor group (21) and a wiring component (22); the power transistor group (21) is used to realize power conversion; the wiring component (22) is used to connect the power transistor group (21) and the capacitor busbar (11), and its power take-off part is located between the first capacitor array (12) and the second capacitor array (13); The first capacitor array (12) and the second capacitor array (13) are both arranged in a rectangular array, and the number and arrangement of the capacitors (14) are the same. In the first capacitor array (12) and the second capacitor array (13), the number of capacitors (14) in the vertical direction is less than the number of capacitors in the horizontal direction. The capacitor busbar (11) includes a first electrode plate (111), a second electrode plate (112), and a third electrode plate (113) stacked together; the two ends of the first capacitor array (12) are respectively connected to the first electrode plate (111) and the second electrode plate (112); the two ends of the second capacitor array (13) are respectively connected to the second electrode plate (112) and the third electrode plate (113). The wiring component (22) includes a first wiring unit (221) connected to the first electrode plate (111), a second wiring unit (222) connected to the second electrode plate (112), and a third wiring unit (223) connected to the third electrode plate (113); the first wiring unit (221) is close to the first capacitor array (12) at the power-taking part of the capacitor busbar (11); the third wiring unit (223) is close to the second capacitor array (13) at the power-taking part of the capacitor busbar (11).

2. A power component as described in claim 1, characterized in that, The first wiring unit (221), the second wiring unit (222) and the third wiring unit (223) extend from the power-taking part of the capacitor busbar (11) in the left-right direction.

3. A power component as described in claim 2, characterized in that, The power module (20) further includes at least one mounting base (23); the mounting base (23) has a mounting surface on the side of its surface away from the capacitor busbar (11) that is parallel to the capacitor busbar (11); the power transistor group (21) is fixed to the mounting surface; the first wiring unit (221), the second wiring unit (222) and the third wiring unit (223) are stacked wiring bars.

4. A power component as described in claim 2, characterized in that, The power module (20) further includes at least one mounting base (23); the mounting base (23) has two mounting surfaces that are opposite to each other and parallel to the capacitor busbar (11); the power transistor group (21) includes at least one single-phase switching transistor group, each single-phase switching transistor group includes several switching modules, each switching module includes a first input transistor (211), a second input transistor (212), and an output transistor (213), wherein the first input transistor (211) is located on the mounting surface opposite to the capacitor busbar (11), and the second input transistor (212) is located on the mounting surface facing the capacitor busbar (11); The first wiring unit (221) is a terminal block, which is connected to the first terminal of the first end of the first input tube (211); the second wiring unit (222) includes a terminal block and a plurality of terminals, wherein the terminal block is stacked with the first wiring unit (221) and connected to the second terminal of the first end of each of the first input tubes (211), and wherein each terminal is connected to the first terminal of the first end of each of the second input tubes (212); the third wiring unit (223) is a plurality of terminals, which is connected to the second terminal of the second end of each of the second input tubes (212).

5. A power component as described in claim 1, characterized in that, The input terminal of the capacitor busbar (11) and the output terminal of the power module (20) are located opposite each other in the vertical direction.

6. A converter, characterized in that, Includes the power components as described in any one of claims 1-5.

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