A power assembly and a power converter

Abstract

This invention discloses a power assembly and a converter. The power assembly includes: a capacitor module comprising a capacitor busbar; and a power module comprising a power transistor group and wiring components. The power transistor group includes several switching devices, each of which is divided into DC-side switching devices and AC-side switching devices according to its connection relationship with the DC and AC sides of the power module. The DC-side switching devices are connected to the capacitor busbar through the wiring components. The wiring components include busbars and conductive elements. The switching devices have terminals for external wiring. The terminals of some DC-side switching devices are connected to the capacitor busbar after being combined through the busbars, while the terminals of other DC-side switching devices are connected to the capacitor busbar one-to-one with the conductive elements. This power assembly achieves a good balance between reducing stray inductance and improving the current-carrying efficiency of the capacitor busbar.

Description

Technical Field

[0001] This invention relates to the field of converter technology, and more specifically to a power component and a converter. Background Technology

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

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

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

[0005] Reference Figure 1 Existing power components reduce stray inductance generated during commutation by using a large number of copper busbar stacks, resulting in excessively high manufacturing costs. Summary of the Invention

[0006] The purpose of this invention is to overcome the aforementioned defects or problems in the prior art and to provide a power component and converter that can achieve a better balance between reducing stray inductance and improving the current carrying efficiency of the capacitor busbar.

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

[0008] A power assembly includes: a capacitor module including a capacitor busbar; and a power module including a power transistor group and a wiring component; the power transistor group includes a plurality of switching devices, each switching device being divided into DC-side switching devices and AC-side switching devices according to its connection relationship with the DC side and AC side of the power module, wherein the DC-side switching devices are connected to the capacitor busbar through the wiring component; the wiring component includes a busbar and a conductive element; the switching devices have terminals for external wiring, some of the terminals of the DC-side switching devices are connected to the capacitor busbar after being combined through the busbar, and the terminals of the other part of the DC-side switching devices correspond one-to-one with each of the conductive elements to be connected to the capacitor busbar.

[0009] Furthermore, the power module also includes at least one mounting base, which forms a first mounting surface facing away from the capacitor busbar and a second mounting surface facing the capacitor busbar; in the power transistor group, some switching devices are located on the first mounting surface and some switching devices are located on the second mounting surface; wherein, at least some DC-side switching devices located on the first mounting surface are connected to the capacitor busbar after being combined by the busbar; at least some DC-side switching devices located on the second mounting surface have their respective terminals connected to the capacitor busbar one-to-one by the conductive element.

[0010] Furthermore, in the power transistor group, the DC-side switching devices are divided into Class I switches and Class II switches according to their wiring polarity; the Class I switches and Class II switches are connected to the capacitor busbar through the wiring components, and the Class I switches and Class II switches are located on the first mounting surface and the second mounting surface, respectively.

[0011] Furthermore, the capacitor busbar includes a first plate, a second plate, and a third plate stacked in order of proximity to the power module. The first type of switch is connected to the first plate and the second plate through the busbar, and the second type of switch is connected to the second plate and the third plate through the conductive element.

[0012] Furthermore, corresponding to a type I switch, the wiring component includes a first busbar and a second busbar; the first busbar and the second busbar are respectively connected to two terminals on the type I switch; corresponding to a type II switch, the wiring component includes a first conductive element and a second conductive element, the first conductive element and the second conductive element are respectively connected to two terminals on the type II switch.

[0013] Furthermore, the first busbar and the second busbar are stacked, and the first busbar passes through the corresponding openings on the third plate and the second plate in sequence and is connected to the first plate, and the second busbar passes through the corresponding openings on the third plate and is connected to the second plate.

[0014] Furthermore, the first conductive element and the second conductive element are arranged side by side, and the first conductive element passes through the corresponding opening on the third electrode plate and is connected to the second electrode plate, and the second conductive element is connected to the third electrode plate.

[0015] Furthermore, the first busbar has at least one first bus terminal for connecting to the capacitor busbar, and the second busbar has at least one second bus terminal for connecting to the capacitor busbar; each of the first bus terminal and the second bus terminal corresponds only to one opening on the third plate and the second plate, and the first bus terminal and the second bus terminal are arranged in the vertical direction; insulating materials are provided around the openings on the third plate and the second plate for the first busbar and the second busbar to pass through.

[0016] Furthermore, each of the first conductive elements corresponds to an opening on the third electrode plate; an insulating element is provided around the opening on the third electrode plate for each of the first conductive elements to pass through.

[0017] In addition, the present invention provides a converter that includes the power components as described in any of the preceding claims.

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

[0019] 1. In the power assembly provided by this invention, the DC-side switching devices in the power transistor group are connected to the capacitor busbar via a wiring component. The wiring component includes a busbar and a conductive component. The busbar can combine the terminals of multiple independent DC-side switching devices before connecting them to the capacitor busbar. One end of the conductive component is connected to the terminal of a DC-side switching device, and the other end is connected to the capacitor busbar. Therefore, there is a one-to-one correspondence between the conductive component and the terminals of the DC-side switching devices. That is, in this power assembly, some DC-side switching devices are connected to the capacitor busbar after being combined, while other DC-side switching devices are directly connected to the capacitor busbar. This wiring method avoids the increase in stray inductance in the circuit caused by the increased commutation path when using all bus connections. It also avoids the decrease in current-carrying efficiency of the capacitor busbar caused by the increased perforations created by the conductive components when all connections are made directly. This achieves a balance between lower stray inductance and higher current-carrying efficiency of the capacitor busbar. In this way, the overall current-carrying efficiency of the capacitor busbar can be improved by using bus connections, and the overall stray inductance can be reduced by using conductive components. Furthermore, since the conductive components do not need to pass through the busbar, the balance of each DC-side switching device when connected to the capacitor busbar is also better.

[0020] 2. The power transistors are divided into two parts and mounted on two opposing mounting surfaces of the mounting base. The DC-side switching devices on the first mounting surface (opposite to the capacitor busbar) are connected to the capacitor busbar via a busbar, while the DC-side switching devices on the second mounting surface (facing the capacitor busbar) are connected to the capacitor busbar via conductive elements. The first mounting surface is farther from the capacitor busbar, and the second mounting surface is closer. Placing the DC-side switching devices on the two mounting surfaces shortens the overall commutation loop, thus reducing stray inductance. Furthermore, connecting the DC-side switching devices farther from the capacitor busbar via a busbar simplifies wiring, and the first mounting surface has ample space for busbar connections. Connecting the DC-side switching devices closer to the capacitor busbar via conductive elements allows for electrical connection within the smaller space between the second mounting surface and the capacitor busbar, avoiding the increased stray inductance that would result from requiring a busbar in that smaller space.

[0021] 3. DC-side switching devices are divided into Class I and Class II switches based on their wiring polarity. Class I switches are located on the first mounting surface, and Class II switches are located on the second mounting surface. Since the wiring polarity relationship between the same type of switching device and the capacitor busbar is the same, when the two types of switching devices are set separately on two different mounting surfaces of the mounting base, the terminals of the Class I switches connected by busbars can be connected at the same mounting surface without having to go around to the second mounting surface, making the overall wiring simpler. In the Class II switches, there is no need to mix in busbars, avoiding interference between the busbars and conductive parts.

[0022] 4. In the capacitor busbar, the first, second, and third plates are stacked sequentially. Type I switches are connected to the first and second plates via busbars, while Type II switches are connected to the second and third plates via conductive elements. The busbars connecting Type I switches need to pass through corresponding openings on the second and third plates to connect to the first plate. Compared to a distributed connection of multiple conductive elements, the connection points of the busbars are more concentrated when connected to the capacitor busbar, reducing the number of openings on the second and third plates and avoiding a significant impact on the busbar's current-carrying efficiency due to the need for safety regulations to address a large number of openings. Furthermore, the busbars themselves need to carry... Larger currents result in larger cross-sectional areas and typically thicker components, allowing the connection between the busbar and the capacitor busbar to occupy less space in the left-right direction, further reducing the impact of openings on the busbar's current-carrying efficiency. The conductive components of Class II switches only need to pass through the corresponding openings on the third plate to connect to the first plate, requiring fewer passes. Therefore, even though the connection points are more dispersed than those of busbars, Class II switches using conductive components effectively reduce stray inductance. Furthermore, since they only need to pass through the third plate, the impact on the capacitor busbar's current-carrying efficiency is also lower.

[0023] Overall, this solution, with the switching device positions fixed, utilizes the current-carrying efficiency advantage of the busbar more fully by configuring the plate stacking sequence, i.e., setting it to the order of first plate, second plate, and third plate, compared to the order of third plate, second plate, and first plate. The third plate, which is closer to the power module, has a higher current-carrying efficiency, and can maintain a low stray inductance while ensuring that the capacitor busbar still has good current-carrying efficiency.

[0024] 5. In a Class I switch, the wiring components include a first busbar and a second busbar, which are respectively connected to different terminals on the Class I switch. Since the Class I switches are all located on the first mounting surface, both terminals on the Class I switch need to be connected to the capacitor busbar through the busbar. Therefore, two independent busbars are provided so that the Class I switch can be connected to the first plate and the second plate respectively. Similarly, in a Class II switch, the wiring components include a first conductive element and a second conductive element, which are respectively connected to different terminals on the Class II switch. Since the Class II switches are all located on the second mounting surface, both terminals on the Class II switch need to be connected to the capacitor busbar through the conductive element. Therefore, two independent conductive elements are provided so that the Class II switch can be connected to the second plate and the third plate respectively.

[0025] 6. The first bus and the second bus are stacked together. The stacking arrangement can reduce stray inductance in the circuit.

[0026] 7. The first and second conductive components are arranged side by side, which can reduce the distance from the terminals on the second type of switch to the capacitor busbar, shorten the commutation circuit, and reduce stray inductance in the circuit.

[0027] 8. The first busbar is provided with a first busbar terminal, and the second busbar is provided with a second busbar terminal. The first busbar terminal and the second busbar terminal are connected to the plates on the capacitor busbar. The first busbar terminal and the second busbar terminal are arranged vertically, which can reduce the number and size of the openings in the left and right directions of the capacitor busbar and improve the current carrying efficiency of the capacitor busbar. In addition, the insulation material is provided around the openings to improve electrical safety.

[0028] 9. Each conductive component corresponds to an opening on the third electrode plate. Compared to setting an opening that extends along the entire direction of the conductive component, the area of ​​the opening can be reduced, and each conductive component is more convenient to connect. Attached Figure Description

[0029] 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.

[0030] Figure 1 This is a schematic diagram of the power component structure in the background technology;

[0031] Figure 2 The circuit diagram is shown in the background section, representing a three-level topology.

[0032] Figure 3 A schematic diagram of the power component provided in Embodiment 1 of the present invention. Figure 1 ;

[0033] Figure 4 for Figure 1 A partial structural diagram of a medium-power module;

[0034] Figure 5 for Figure 1 A side view of part of the structure of a medium-power component;

[0035] Figure 6 for Figure 1 Rear view diagram of medium power components

[0036] Explanation of key figure labels:

[0037] Capacitor module 10; capacitor busbar 11; first electrode plate 111; second electrode plate 112; third electrode plate 113; capacitor array 12; capacitor 13; capacitor busbar input terminal 14; opening 15; insulating component 16;

[0038] Power module 20; power transistor group 21; Class I switch 211; Class II switch 212; Class III switch 213; wiring component 22; first busbar 221; second busbar 222; first conductive element 223; second conductive element 224; first bus terminal 225; second bus terminal 226; mounting base 23; power transistor group output terminal 24; main power supply 25; first power supply 251; second power supply 252; third power supply 253. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this invention is for distinguishing different objects and not for describing a specific order.

[0041] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of this invention.

[0042] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection by other means or components.

[0043] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0044] Example 1

[0045] Reference Figure 3Embodiment 1 of the present invention provides a power component, which mainly includes a capacitor module 10 and a power module 20. The capacitor module 10 includes a DC capacitor bank and a capacitor busbar 11, and the power module 20 includes a power transistor group 21, a wiring component 22, and a mounting base 23.

[0046] Reference Figure 3 The DC capacitor bank in capacitor module 10 includes several capacitors 13, which correspond to Figure 2 Capacitors C1 and C2 are shown in the diagram. (Refer to...) Figure 3 The capacitor 13 of the DC capacitor bank is connected to the capacitor busbar 11. (Refer to...) Figure 3 and Figure 5 The capacitor busbar 11 includes a first electrode plate 111, a second electrode plate 112, and a third electrode plate 113 stacked together. According to... Figure 3 and Figure 5 In the front-to-back direction, the power module 20 is located in front of the capacitor busbar 11. The first electrode plate 111, the second electrode plate 112, and the third electrode plate 113 are arranged in order of gradually approaching the power module 20. Therefore, the first electrode plate 111, the second electrode plate 112, and the third electrode plate 113 are arranged from back to front, with the first electrode plate 111 at the rear, the second electrode plate 112 in the middle, and the third electrode plate 113 at the front. The capacitors 13 in the DC capacitor bank are all fixed to the rear side of the capacitor busbar 11. The capacitors 13 are all cylindrical components, and their bottoms are connected to the capacitor busbar 11. In this embodiment, the first electrode plate 111 is the positive electrode plate, the second electrode plate 112 is the neutral electrode plate, and the third electrode plate 113 is the negative electrode plate.

[0047] Reference Figure 3 At the upper end of the capacitor busbar 11, three terminals extend from the first plate 111, the second plate 112, and the third plate 113, respectively. These three terminals form the input terminal of the capacitor busbar 11. Here, "input terminal" refers to the point where DC power is supplied when the power component is used to convert DC to AC. It should be understood that when the power component is used to convert AC to DC, the original input terminal of the capacitor busbar 11 becomes the actual DC output terminal. Therefore, referring to it as the input terminal of the capacitor busbar 11 here is merely for convenience and does not imply that it can only be used as an electrical energy input.

[0048] Reference Figure 3The power transistor group 21 in the power module 20 includes several switching devices. Each switching device is divided into DC-side switching devices and AC-side switching devices based on its connection relationship with the DC and AC sides of the power module 20. The DC-side switching devices are connected to the capacitor busbar 11 via wiring components 22. All switching devices have terminals for external wiring. The DC-side switching devices are further divided into type I switches 211 and type II switches 212 based on their wiring polarity. Both type I switches 211 and type II switches 212 are connected to the capacitor busbar 11 via wiring components 22. It should be noted that the DC side and AC side referred to here can be considered as the side of the power module 20 closer to the capacitor busbar 11 in terms of circuit connection, which is the DC side, and the other side is the AC side.

[0049] Specifically, refer to Figure 3 and Figure 5 In this embodiment, the power transistor group 21 includes three single-phase switching transistor groups, each single-phase switching transistor group includes three sets of switching modules, and each switching module includes three switching devices. The three sets of switching modules in each single-phase switching transistor group are arranged in a left-right direction, and the three single-phase switching transistor groups are also arranged in a left-right direction. (Refer to...) Figure 3 In this embodiment, nine sets of switch modules are arranged along the left-right direction. The switching devices are IGBT modules. Among the three switching devices in each switch module, they belong to Class I switch 211, Class II switch 212 and Class III switch 213, respectively. Class I switch 211 and Class II switch 212 belong to DC-side switching devices, and Class III switch 213 belongs to AC-side switching devices.

[0050] The power module 20 also includes at least one mounting base 23, which forms a first mounting surface facing away from the capacitor busbar 11 and a second mounting surface facing the capacitor busbar 11. In the power transistor group 21, some switching devices are located on the first mounting surface, and some switching devices are located on the second mounting surface. Specifically, refer to... Figure 5 In this embodiment, type I switch 211 and type III switch 213 are located on the first mounting surface, and type II switch 212 is located on the second mounting surface. Type I switch 211 is located on the upper side of the first mounting surface, type III switch 213 is located on the lower side of the first mounting surface, and type II switch 212 is located on the upper side of the second mounting surface. Each of the three switching devices in the same switch module occupies a unit dimension equal to the width of a switching device in the left-right direction, and type I switch 211 and type II switch 212 are symmetrical to each other. Corresponding to... Figure 2 In a switch module, one type of switch 211 is... Figure 2 Pipes 1 and 2 in the middle, the second type of switch 212 is Figure 2 Pipes 3 and 4 in the middle, the three types of switches 213 are Figure 2Pipes 5 and 6 are shown in the diagram. Type I switch 211, Type II switch 212, and Type III switch 213 are connected via a connecting bus. On the three switch modules of the same single-phase switch module, there is also an output bus connected to the three Type III switches 213, which forms the output terminal of the power module 20. Of course, when this power component is used to convert AC to DC, the original output terminal of the power module 20 becomes the actual AC input terminal. Therefore, it is referred to here as the output terminal of the power module 20 only for convenience and does not mean that it can only be used for electrical energy output. (See reference...) Figure 3 In this embodiment, 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. That is, the input terminal of the capacitor busbar 11 is located at the upper end of the power component, while the output terminal of the power module 20 is located at the lower end of the power component.

[0051] Each switching device has terminals for external wiring. The terminals of the DC-side switching devices are used to connect to the wiring component 22 and the three types of switches 213. In this embodiment, the terminals of the first type of switch 211 include a positive terminal and a neutral terminal, and the terminals of the second type of switch 212 include a neutral terminal and a negative terminal. The positive terminal, neutral terminal, and negative terminal are all connected to the capacitor busbar 11 through the wiring component 22.

[0052] The wiring component 22 includes a busbar and conductive elements. The terminals of some DC-side switching devices are connected to the capacitor busbar 11 after being combined through the busbar. The terminals of other DC-side switching devices are connected to the capacitor busbar 11 one-to-one with the conductive elements. Specifically, at least some DC-side switching devices located on the first mounting surface are connected to the capacitor busbar 11 after being combined through the busbar, and at least some DC-side switching devices located on the second mounting surface have their respective terminals connected to the capacitor busbar 11 one-to-one with the conductive elements.

[0053] Specifically, in this embodiment, among the DC-side switching devices, the first type of switches 211 located on the first mounting surface are all connected to the first electrode plate 111 and the second electrode plate 112 on the capacitor busbar 11 via a busbar, and the second type of switches 212 located on the second mounting surface are all connected to the second electrode plate 112 and the third electrode plate 113 via conductive elements. Of course, in other embodiments, the first type of switches 211 can be fixed on the second mounting surface and connected by conductive elements, and the second type of switches 212 can be fixed on the first mounting surface and connected by a busbar. This embodiment is only one preferred implementation and does not exclude other situations mentioned above.

[0054] In this embodiment, the busbar is a copper bus, and the conductive component is a conductive post. In other embodiments, the busbar can be a metal busbar formed of flexible metal wire, and the conductive component can be other shapes, such as a wide, flat shape.

[0055] Reference Figure 4 and Figure 5 Corresponding to a type I switch 211, the wiring component 22 includes a first busbar 221 and a second busbar 222, which are respectively connected to two terminals on the type I switch 211. Corresponding to a type II switch 212, the wiring component 22 includes a first conductive element 223 and a second conductive element 224, which are respectively connected to two terminals on the type II switch 212. The first busbar 221 and the second busbar 222 are stacked, with the first busbar 221 passing through corresponding openings 15 on the third electrode plate 113 and the second electrode plate 112 before connecting to the first electrode plate 111, and the second busbar 222 passing through corresponding openings 15 on the third electrode plate 113 before connecting to the second electrode plate 112. The first conductive element 223 and the second conductive element 224 are arranged side by side, and the first conductive element 223 passes through the corresponding opening 15 on the third electrode plate 113 and is connected to the second electrode plate 112, and the second conductive element 224 is connected to the third electrode plate 113.

[0056] Reference Figure 5 The first busbar 221 has at least one first bus terminal 225 for connecting to the capacitor busbar 11, and the second busbar 222 has at least one second bus terminal 226 for connecting to the capacitor busbar 11. Each first bus terminal 225 and second bus terminal 226 corresponds to only one opening 15 on the third electrode plate 113 and the second electrode plate 112, and the first bus terminal 225 and the second bus terminal 226 are arranged in the vertical direction. Insulating members 16 are provided around the openings 15 on the third electrode plate 113 and the second electrode plate 112 for the passage of the first busbar 221 and the second busbar 222. Each conductive member corresponds to one opening 15 on the third electrode plate 113, and insulating members 16 are provided around the openings 15 on the third electrode plate 113 for the passage of each conductive member.

[0057] Specifically, refer to Figure 3 and Figure 4 The busbars connected to the type-agent switch 211 include a first busbar 221 and a second busbar 222. The first busbar 221 is connected to the positive terminal of the type-agent switch 211 and then to the first plate 111 on the capacitor busbar 11. The second busbar 222 is connected to the neutral terminal of the type-agent switch 211 and then to the second plate 112 on the capacitor busbar 11. Therefore, the first busbar 221 needs to pass through the opening 15 on the third plate 113 and the second plate 112 to connect to the first plate 111, and the second busbar 222 needs to pass through the opening 15 on the third plate 113 to connect to the second plate 112.

[0058] In this embodiment, the first busbar 221 and the second busbar 222 are stacked, but their corresponding first bus terminals 225 and second bus terminals 226 are arranged vertically on the capacitor busbar 11. The first busbar 221 has two first bus terminals 225, both rectangular in shape, and arranged horizontally. Similarly, the second busbar 222 has two second bus terminals 226, both rectangular in shape, and arranged horizontally. Furthermore, the positions of the two first bus terminals 225 and the two second bus terminals 226 correspond in the horizontal direction, thereby preventing a decrease in current-carrying efficiency due to misalignment of the first bus terminals 225 and the second bus terminals 226 in the vertical direction of the capacitor busbar 11, i.e., the current-carrying direction of the capacitor busbar 11. (Refer to...) Figure 3 On the openings 15 of the capacitor busbar 11 corresponding to the first bus terminal 225 and the second bus terminal 226, an insulating element 16 is provided at the edge of the opening, and the edge of the opening 15 is still a certain distance from the first bus terminal 225 and the second bus terminal 226, so as to improve the electrical safety of the exposed wiring components 22.

[0059] In this embodiment, each busbar includes a busbar body and a conductive connecting block. The shape and size of the connecting block are the same as the bus terminal on the busbar. The connecting block is fixed to the corresponding electrode plate of the capacitor busbar 11. For example, for the first bus terminal 225, the corresponding connecting block is fixed to the first electrode plate 111. Then, the busbar body is fixed to the connecting block with bolts, so that the busbar body can be connected to the corresponding electrode plate through the connecting block. This connection method facilitates the connection of the busbar to the capacitor busbar 11 without the need for additional threaded holes or other connection structures on the capacitor busbar 11. Of course, in other embodiments, the busbar can be directly connected to the electrode plate of the capacitor busbar 11 through the busbar body, which can also serve the purpose of connecting the busbar and the capacitor busbar 11.

[0060] Reference Figure 4The conductive components connected to the Class II switch 212 include a first conductive component 223 and a second conductive component 224. The first conductive component 223 is connected to the neutral terminal of the Class II switch 212 and then to the second electrode plate 112 on the capacitor busbar 11. The second conductive component 224 is connected to the negative terminal of the Class II switch 212 and then to the third electrode plate 113 on the capacitor busbar 11. Therefore, the first conductive component 223 only needs to pass through the opening 15 on the third electrode plate 113 to connect to the second electrode plate 112. In this embodiment, both the first conductive component 223 and the second conductive component 224 are cylindrical conductive posts. The opening 15 on the third electrode plate 113 through which the first conductive component 223 passes is also circular, and an insulating component 16 is provided along the edge of the opening 15. The edge of the opening 15 is still a certain distance from the first conductive component 223 to improve the electrical safety of the exposed wiring components 22.

[0061] Reference Figure 6 The location where the wiring component connects to the capacitor busbar 11 forms a main power supply section 25. The main power supply section 25 includes, from top to bottom, a first power supply section 251, a second power supply section 252, and a third power supply section 253. The first power supply section 251 corresponds to the two first bus terminals 225 of the first bus 221, the second power supply section 252 corresponds to the two second bus terminals 226 of the second bus 222, and the third power supply section 253 corresponds to the first conductive element 223 and the second conductive element 224.

[0062] In this embodiment, the power assembly connects the DC-side switching devices in the power transistor group 21 to the capacitor busbar 11 via a wiring component 22. The wiring component 22 includes a busbar and a conductive component. The busbar can combine the terminals of multiple independent DC-side switching devices before connecting them to the capacitor busbar 11. One end of the conductive component is connected to the terminal of a DC-side switching device, and the other end is connected to the capacitor busbar 11. Therefore, there is a one-to-one correspondence between the conductive component and the terminal of the DC-side switching device. In other words, in this power assembly, some DC-side switching devices are connected to the capacitor busbar 11 after being combined, while other DC-side switching devices are directly connected to the capacitor busbar 11. 1. This wiring method avoids the increase in stray inductance in the circuit caused by the increased commutation path when using a busbar connection. It also avoids the decrease in current-carrying efficiency of the capacitor busbar 11 caused by the increased perforations created by the conductive components when using direct connections. This achieves a balance between lower stray inductance and higher current-carrying efficiency of the capacitor busbar 11. In this way, the overall current-carrying efficiency of the capacitor busbar 11 can be improved by using the busbar, and the overall stray inductance can be reduced by using the conductive components. Furthermore, since the conductive components do not need to pass through the busbar, the balance of each DC-side switching device when connected to the capacitor busbar 11 is also better. Furthermore, the power transistor group 21 is divided into two parts and mounted on two opposing mounting surfaces of the mounting base 23. The DC-side switching devices located on the first mounting surface opposite to the capacitor bus 11 are connected to the capacitor bus 11 via a busbar, while the DC-side switching devices located on the second mounting surface facing the capacitor bus 11 are connected to the capacitor bus 11 via conductive elements. The first mounting surface is farther from the capacitor bus 11, and the second mounting surface is closer to the capacitor bus 11. Placing the DC-side switching devices on the two mounting surfaces shortens the overall commutation loop, thereby reducing stray inductance. Simultaneously, the DC-side switching devices farther from the capacitor bus 11 are connected to the capacitor bus 11 via a busbar, making wiring simpler and more convenient. Also, because the first mounting surface has a larger space, a busbar can be used for connection. The DC-side switching devices closer to the capacitor bus 11 are connected via conductive elements, allowing for electrical connection within the smaller space between the second mounting surface and the capacitor bus 11.

[0063] Example 2

[0064] Embodiment 2 of the present invention provides a converter, which includes a housing and a power component disposed within the housing, wherein the power component is the power component provided in Embodiment 1.

[0065] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this invention, but does not constitute a limitation on the scope of protection of this invention. Modifications, equivalent substitutions, or other improvements to the embodiments of this invention or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this invention or the foregoing embodiments, in conjunction with common knowledge, general technical knowledge, and / or existing technology, should all be included within the scope of protection of this invention.

Claims

1. A power component, characterized in that, include: A capacitor module (10) includes a capacitor busbar (11). and The power module (20) includes a power transistor group (21) and a wiring component (22); the power transistor group (21) includes several switching devices, and each switching device is divided into a DC-side switching device and an AC-side switching device according to its connection relationship with the DC side and AC side of the power module (20). The DC-side switching device is connected to the capacitor busbar (11) through the wiring component (22). The wiring component (22) includes a busbar and a conductor; the switching device has a terminal for external wiring, and the terminals of some DC-side switching devices are connected to the capacitor busbar (11) after being combined through the busbar, while the terminals of other DC-side switching devices are connected to the capacitor busbar (11) one by one corresponding to each of the conductors; the power module (20) also includes at least one mounting base (23), which forms a first mounting surface facing away from the capacitor busbar (11) and a second mounting surface facing the capacitor busbar (11); in the power transistor group (21), some switching devices are located on the first mounting surface and some switching devices are located on the second mounting surface; wherein, at least some DC-side switching devices located on the first mounting surface are connected to the capacitor busbar (11) after being combined through the busbar; at least some DC-side switching devices located on the second mounting surface are connected to the capacitor busbar (11) one by one corresponding to each of the conductors.

2. A power component as described in claim 1, characterized in that, In the power transistor group (21), the DC-side switching devices are divided into a type I switch (211) and a type II switch (212) according to the different wiring polarities. The type I switch (211) and the type II switch (212) are connected to the capacitor busbar (11) through the wiring component (22), and the type I switch (211) and the type II switch (212) are located on the first mounting surface and the second mounting surface, respectively.

3. A power component as described in claim 2, characterized in that, The capacitor busbar (11) includes a first plate (111), a second plate (112), and a third plate (113) stacked in order of gradually approaching the power module (20). A type I switch (211) is connected to the first plate (111) and the second plate (112) through the busbar, and a type II switch (212) is connected to the second plate (112) and the third plate (113) through the conductive element.

4. A power component as described in claim 3, characterized in that, For a type I switch (211), the wiring component (22) includes a first busbar (221) and a second busbar (222); the first busbar (221) and the second busbar (222) are respectively connected to two terminals on the type I switch (211); for a type II switch (212), the wiring component (22) includes a first conductive element (223) and a second conductive element (224); the first conductive element (223) and the second conductive element (224) are respectively connected to two terminals on the type II switch (212).

5. A power component as described in claim 4, characterized in that, The first busbar (221) and the second busbar (222) are stacked, and the first busbar (221) passes through the corresponding openings (15) on the third electrode plate (113) and the second electrode plate (112) in sequence and is connected to the first electrode plate (111). The second busbar (222) passes through the corresponding openings (15) on the third electrode plate (113) and is connected to the second electrode plate (112).

6. A power component as described in claim 4, characterized in that, The first conductive element (223) and the second conductive element (224) are arranged side by side, and the first conductive element (223) passes through the corresponding opening (15) on the third electrode plate (113) and is connected to the second electrode plate (112), and the second conductive element (224) is connected to the third electrode plate (113).

7. A power component as described in claim 5, characterized in that, The first busbar (221) has at least one first busbar terminal (225) for connecting the capacitor busbar (11), and the second busbar (222) has at least one second busbar terminal (226) for connecting the capacitor busbar (11); each of the first busbar terminal (225) and the second busbar terminal (226) corresponds only to one opening (15) on the third plate (113) and the second plate (112), and the first busbar terminal (225) and the second busbar terminal (226) are arranged in the vertical direction; an insulating member (16) is provided around the opening (15) on the third plate (113) and the second plate (112) for the first busbar (221) and the second busbar (222) to pass through.

8. A power component as described in claim 6, characterized in that, Each of the first conductive elements (223) corresponds to an opening (15) on the third electrode plate (113); an insulating element (16) is provided around the opening (15) on the third electrode plate (113) for each of the first conductive elements (223) to pass through.

9. A converter, characterized in that, Includes the power components as described in any one of claims 1-8.

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