Power assembly and converter
By optimizing the structure of the power module in the converter, adopting a parallel mounting substrate and a partitioned arrangement of absorption capacitors, the problem of unbalanced stray inductance in IGBT devices was solved, achieving more efficient power conversion and heat dissipation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-30
- Publication Date
- 2026-03-10
AI Technical Summary
In existing three-level topology converters, the stray inductance of IGBT devices is unbalanced, leading to inconsistent use of absorption capacitors, which affects the power component's losses and heat generation.
The power module adopts a parallel arrangement of the mounting base and capacitor busbar, with switching devices fixed along different mounting surfaces. The absorption capacitor is divided into two parts and connected separately. They are connected to the capacitor busbar through wiring components. The circuit structure is optimized by using conductive sheets and terminals to reduce stray inductance.
This achieves uniform reduction of stray inductance in the absorption capacitor, optimizes space utilization, improves the current carrying efficiency of the capacitor busbar, and reduces switching losses and heat generation.
Smart Images
Figure CN121643418A_ABST
Abstract
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] Existing three-level topology circuit diagrams suffer from high stray inductance. Stray inductance, also known as parasitic inductance, in a three-level topology mainly includes stray inductance generated within the IGBT device, stray inductance in the capacitor busbar, and stray inductance in the capacitor pool. These stray inductances affect the instantaneous voltage and current of the power components, as well as their losses and heat generation. To address this, existing technologies connect low-parasitic-inductance snubber capacitors in parallel at the positive and negative terminals of the IGBT. These snubber capacitors reduce the stray inductance of the corresponding circuit. Figure 1 In the structure of the power assembly shown, a snubber capacitor is provided for each input transistor in each power transistor group. This snubber capacitor has two terminals, each connected to two terminals on the corresponding input transistor that are connected to the input bus. However, in Figure 1 In the power components shown, due to the arrangement of the power modules relative to the DC modules, the IGBT devices farther from the DC modules have longer commutation circuits and generate higher stray inductance, while the IGBT devices closer to the DC modules have shorter commutation circuits and generate lower stray inductance. This results in inconsistent requirements for reducing stray inductance for each snubber capacitor, which is not conducive to the normal use of the snubber capacitors. 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 facilitates the normal use of the absorption capacitor.
[0007] To achieve the above objectives, the present invention adopts the following technical solution:
[0008] A power assembly includes: a capacitor module comprising interconnected DC capacitor banks and a capacitor busbar; the capacitor busbar comprising a plurality of plates with different polarities; the power module comprising a mounting base, a power transistor assembly, and wiring components; the power transistor assembly comprising a plurality of switching devices, wherein some of the switching devices are connected to the capacitor busbar via the wiring components and are classified as first switches and second switches according to their connection relationship with the plates of different polarities on the capacitor busbar; the mounting base is parallel to the capacitor busbar and has a first mounting surface facing the capacitor busbar and a second mounting surface facing away from the capacitor busbar, and each of the first switches... The first and second switches are arranged and fixed on the first mounting surface along the first direction, and each second switch is arranged and fixed on the second mounting surface along the first direction; and several sets of absorption capacitors, each first switch and each second switch being connected to a set of absorption capacitors, and the absorption capacitors connected to the first switches being located between the mounting base and the capacitor busbar, and the absorption capacitors connected to the second switches being located on the side of the mounting base away from the capacitor busbar; the first and second switches are provided with terminals for connecting to the wiring components, and the terminals of each first and second switch are also connected to the corresponding absorption capacitors.
[0009] Furthermore, the terminals of the first switch are connected in sequence to the absorption capacitor and the wiring component, or in sequence to the wiring component and the absorption capacitor; the terminals of the second switch are connected in sequence to the absorption capacitor and the wiring component, or in sequence to the wiring component and the absorption capacitor.
[0010] Furthermore, the absorption capacitor is provided with an outwardly extending conductive sheet, which is connected to the corresponding terminal on the first switch or the second switch, so that the absorption capacitor avoids the wiring component.
[0011] Furthermore, the wiring component includes a plurality of first terminals and a plurality of second terminals; the terminals of the first switch are connected to the first terminals, and the terminals of the second switch are connected to the second terminals; the conductive sheet of the absorption capacitor is connected to the terminals of the corresponding first switch and / or second switch through the first terminals and the second terminals, or directly connected to the terminals of the corresponding first switch and / or second switch.
[0012] Furthermore, the wiring component also includes a busbar; the first switch and the second switch are both DC-side switching devices; among the DC-side switching devices, the wiring terminals of some of the switching devices are connected to the busbar through corresponding first or second terminals, and are connected to the capacitor busbar after being combined through the busbar.
[0013] Furthermore, the terminals of each of the first switches are directly connected to the capacitor busbar via corresponding first terminals; the terminals of each of the second switches are connected to the busbar via corresponding second terminals, and are connected to the capacitor busbar after being combined through the busbar.
[0014] Furthermore, one end of the first terminal is connected to the terminal of the corresponding first switch, and cooperates with the terminal to clamp and connect the conductive sheet of the corresponding absorption capacitor; the second terminal starts from the terminal of the corresponding second switch and is sequentially connected to the busbar and the corresponding absorption capacitor.
[0015] Furthermore, the conductive sheet has an opening; the first terminal has a screw post, which passes through the opening of the conductive sheet of the absorption capacitor corresponding to the first switch and is then screwed to the terminal of the first switch, so as to clamp the conductive sheet between the first terminal and the terminal; the conductive sheet of the absorption capacitor corresponding to the second switch also has an opening and is fixed to the end of the second terminal by bolts, or the conductive sheet of the absorption capacitor corresponding to the second switch is directly fixed to the second terminal by welding; the conductive sheet of the absorption capacitor extends horizontally outward from the absorption capacitor and then extends upward to form a bend, the bend causing the capacitor part of the absorption capacitor to be misaligned with the first terminal or the second terminal in the vertical direction, so that the absorption capacitor can avoid the wiring component.
[0016] Furthermore, both the first switch and the second switch are arranged along the length of the mounting base, and the terminals of the first switch and the second switch are close to the same edge of the mounting base; the length of the mounting base is perpendicular to the current-carrying direction of the capacitor busbar.
[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 mounting base of the power module is parallel to the capacitor busbar. Switching devices are mounted on the mounting base and connected to the capacitor busbar via wiring components. A first switch is arranged and fixed on a first mounting surface of the mounting base along a first direction, and a second switch is arranged and fixed on a second mounting surface of the mounting base along the first direction. That is, the mounting positions of the first and second switches are opposite to each other relative to the mounting base, and the arrangement directions of the first and second switches are the same. Under this positional relationship, the distances from each first switch and each second switch to the capacitor busbar are the same. Based on this, the absorption capacitor is divided into two parts, one part corresponding to the first switch and the other... Each of the first and second switches is connected to a set of absorption capacitors, ensuring that the requirement for reducing stray inductance is consistent for each absorption capacitor. Furthermore, the absorption capacitors corresponding to the first switch are located between the mounting base and the capacitor busbar, while those corresponding to the second switch are located outside the mounting base. This minimizes the distance between the absorption capacitors and the first and second switches, maximizing their effectiveness in absorbing voltage spikes generated during switching and reducing stray inductance. It also maximizes the use of space between the mounting base and the capacitor busbar, preventing the absorption capacitors from occupying excessive space. In addition, both the first and second switches are equipped with terminals that can connect not only to wiring components but also to the absorption capacitors. The absorption capacitors, connected to these terminals, reduce the stray inductance of the switching devices.
[0020] 2. The order in which the terminals of the first and second switches are connected to the absorption capacitor and wiring components can be adjusted according to actual needs. This change in order will not affect the effectiveness of the absorption capacitor. However, it should be noted that the absorption capacitor should be positioned as close as possible to the first and second switches to improve the effectiveness of the absorption capacitor.
[0021] 3. The absorption capacitor is provided with an outwardly extending conductive plate, which is connected to the corresponding terminal. This allows the main body of the absorption capacitor, which occupies a large space, to avoid the wiring components in the power module, and also facilitates the installation of the absorption capacitor.
[0022] 4. The wiring components include a first terminal and a second terminal. The terminals can be connected to the terminals of the switching devices. The absorption capacitor can be connected to the terminals of the switching devices through the terminals or directly to the terminals of the switching devices. Depending on the positional relationship between the absorption capacitor and other components, connecting through the terminals increases the distance between the main body of the absorption capacitor and the switching devices, making it easier to avoid the wiring components and the switching devices. Directly connecting to the terminals reduces the distance between the absorption capacitor and the terminals of the switching devices, improving the effect of the absorption capacitor in reducing stray inductance and increasing space utilization.
[0023] 5. The wiring components also include a busbar, through which the first switch or the second switch is connected to the capacitor busbar. This reduces the number of openings on the capacitor busbar, improves the current carrying efficiency of the capacitor busbar, and also facilitates the installation of the wiring components.
[0024] 6. The first switch's terminals are directly connected to the capacitor busbar via the first terminal, while the second switch is connected to the capacitor busbar via the second terminal and the busbar. These two connection methods avoid the increased stray inductance in the circuit caused by the increased commutation path when using a busbar connection, and also avoid the reduced current-carrying efficiency of the capacitor busbar caused by more through-holes created by the terminals when using direct terminal connections. This achieves a balance between lower stray inductance and higher current-carrying efficiency of the capacitor busbar. Thus, the overall current-carrying efficiency of the capacitor busbar can be improved using busbars, and the overall stray inductance can be reduced using terminals. Furthermore, since the terminals do not need to pass through a busbar, the balance of each DC-side switching device's connection to the capacitor busbar is also better.
[0025] 7. The first terminal and the terminal clamp the conductive piece of the absorption capacitor, which can realize the installation and fixation of the absorption capacitor; while the second terminal connects the busbar and the absorption capacitor in sequence. This is because the end of the second terminal is exposed, and the conductive piece of the absorption capacitor can be easily connected to the second terminal.
[0026] 8. The absorption capacitor is connected to the terminal block and the wiring end by means of screws passing through the openings on the conductive sheet or by direct welding. The conductive sheet is bent to achieve vertical misalignment between the absorption capacitor and the first or second terminal block, thereby avoiding the absorption capacitor from the wiring components, facilitating electrical connection and effectively reducing space occupation.
[0027] 9. The first direction is the length direction of the mounting base, and the length direction of the mounting base is perpendicular to the current carrying direction of the capacitor busbar, which can ensure the circuit balance when the first switch and the second switch are connected to the capacitor busbar; at the same time, the terminals of the first switch and the second switch are close to the same edge of the mounting base, which can shorten the length of the overall commutation circuit and reduce stray inductance. 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 This is a structural side view of the power component provided in Embodiment 1 of the present invention;
[0032] Figure 4 for Figure 3 Enlarged view of section A;
[0033] Figure 5 for Figure 3 Schematic diagram of the structure of a medium-power module;
[0034] Figure 6 for Figure 3 A partial structural diagram of a medium-power module;
[0035] Figure 7 for Figure 3 A schematic diagram of the structure of the switching device.
[0036] Explanation of key figure labels:
[0037] Capacitor module 10; DC capacitor cell 11; capacitor busbar 12; power module 20; mounting base 21; power transistor group 22; wiring component 23; first mounting surface 211; second mounting surface 212; switching device 221; terminal 2211; first switch 222; second switch 223; third switch 224; first terminal 231; second terminal 232; busbar 233; absorption capacitor 30; conductive sheet 31; capacitor component 32; connection bar 41; output bar 42. Detailed Implementation
[0038] 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.
[0039] 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.
[0040] 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.
[0041] 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.
[0042] 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."
[0043] Example 1
[0044] Reference Figure 3 Embodiment 1 of the present invention provides a power component, which mainly includes a capacitor module 10, a power module 20, and several sets of absorption capacitors 30. The capacitor module 10 includes a DC capacitor bank 11 and a capacitor busbar 12 connected to each other, and the capacitor busbar 12 includes several plates with different polarities. The power module 20 includes a mounting base 21, a power transistor group 22, and a wiring component 23.
[0045] Reference Figure 3 The DC capacitor bank 11 in capacitor module 10 includes several capacitors, corresponding to capacitors C1 and C2 in the figure. Referring to the figure, the capacitors in DC capacitor bank 11 are connected to capacitor bus 12. Capacitor bus 12 includes a first plate, a second plate, and a third plate stacked together. According to the figure and the front-back direction in the figure, the power module 20 is located in front of capacitor bus 12. The first plate, second plate, and third plate are arranged in order of gradually approaching the power module 20. Therefore, the first plate, second plate, and third plate are arranged from back to front, with the first plate at the back, the second plate in the middle, and the third plate at the front. The capacitors in DC capacitor bank 11 are all fixed to the rear side of capacitor bus 12. The capacitors are all cylindrical components, and their bottoms are connected to capacitor bus 12. In this embodiment, the first plate is a positive plate, the second plate is a neutral plate, and the third plate is a negative plate.
[0046] Reference Figure 3 At the upper end of capacitor busbar 12, three terminals extend from the first, second, and third plates respectively, forming the input terminal of capacitor busbar 12. 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 capacitor busbar 12 becomes the actual DC output terminal. Therefore, referring to it as the input terminal of capacitor busbar 12 here is merely for convenience and does not imply that it can only be used as an electrical energy input.
[0047] In the power module 20, the power transistor group 22 includes several switching devices 221, some of which are connected to the capacitor busbar 12 via wiring components 23 and are divided into first switches 222 and second switches 223 according to their connection relationship with the plates of different polarities on the capacitor busbar 12. The mounting base 21 is parallel to the capacitor busbar 12 and has a first mounting surface 211 facing the capacitor busbar 12 and a second mounting surface 212 away from the capacitor busbar 12. Each first switch 222 is arranged and fixed on the first mounting surface 211 along the first direction, and each second switch 223 is arranged and fixed on the second mounting surface 212 along the first direction.
[0048] The first direction is the length direction of the mounting base 21, as shown in the reference. Figure 3 It shows the up-down direction and the front-back direction. Relatively speaking, the left-right direction, which is not shown, can be considered as the first direction mentioned above. Furthermore, the length direction of the mounting base 21 is perpendicular to the current-carrying direction of the capacitor busbar 12. The current-carrying direction referred to here can be considered as the extension direction between the input terminal of the capacitor busbar 12 and the connection position between the wiring component 23 and the capacitor busbar 12. In this embodiment, it is the up-down direction.
[0049] Reference Figure 5 and Figure 6 Each switching device 221 is divided into DC-side switching devices 221 and AC-side switching devices 221 according to its connection relationship with the DC and AC sides of the power module 20. The first switch 222 and the second switch 223 are DC-side switching devices 221, and the third switch 224 is an AC-side switching device 221. The lower ends of the first switch 222, the second switch 223, and the third switch 224 are connected via a connecting bus 41. The lower end of the third switch 224 is connected to an output bus 42, which can be connected to external AC electrical components. 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 power output.
[0050] In this embodiment, the power transistor group 22 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 221. 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 5 In this embodiment, nine sets of switch modules are arranged along the left-right direction. The switching device 221 is an IGBT module. Each switch module has three switching devices 221, including a first switch 222, a second switch 223 and a third switch 224.
[0051] Reference Figure 7 Each switching device 221 is provided with a connection terminal for external wiring. The connection terminals of the first switch 222 and the second switch 223 that connect to the wiring component 23 are labeled as wiring terminals 2211. Both the first switch 222 and the second switch 223 include two wiring terminals 2211. In this embodiment, the two wiring terminals 2211 of the first switch 222 are respectively connected to the neutral plate and the negative plate in the capacitor busbar 12, and the two wiring terminals 2211 of the second switch 223 are respectively connected to the positive plate and the neutral plate in the capacitor busbar 12.
[0052] The power module 20 also includes at least one mounting base 21, which forms a first mounting surface 211 facing the capacitor busbar 12 and a second mounting surface 212 away from the capacitor busbar 12. In the power transistor group 22, some switching devices 221 are located on the first mounting surface 211, and some switching devices 221 are located on the second mounting surface 212. Specifically, refer to... Figure 3 In this embodiment, the first switch 222 is located on the first mounting surface 211, and the second switch 223 and the third switch 224 are located on the second mounting surface 212. The first switch 222 and the second switch 223 are both located on the upper side of the mounting base 21 and close to its upper edge, while the third switch 224 is located on the lower side of the mounting base 21. Each of the three switching devices 221 in the same switch module occupies a unit dimension equal to the width of one switching device 221 in the left-right direction, and the first switch 222 and the second switch 223 are symmetrical to each other. In this embodiment, the mounting base 21 is a liquid-cooled heat sink, which can dissipate heat from the switching devices 221 mounted on it.
[0053] Reference Figure 3 and Figure 4The wiring component 23 includes a busbar 233, a first terminal 231, and a second terminal 232. The terminal 2211 of the first switch 222 is connected to the first terminal 231, and the terminal 2211 of the second switch 223 is connected to the second terminal 232. In the DC-side switching devices 221, some of the terminals 2211 of the switching devices 221 are connected to the busbar 233 via corresponding first terminals 231 or second terminals 232, and then connected to the capacitor busbar 12 after being combined through the busbar 233. In this embodiment, the terminals 2211 of each first switch 222 are directly connected to the capacitor busbar 12 via corresponding first terminals 231; the terminals 2211 of each second switch 223 are connected to the busbar 233 via corresponding second terminals 232, and then connected to the capacitor busbar 12 after being combined through the busbar 233.
[0054] In this embodiment, the busbar 233 is a copper busbar, and the terminals are conductive posts. In other embodiments, the busbar 233 can be a metal busbar 233 formed of flexible metal wire, and the terminals can be other shapes, such as wide and flat. The connection between the terminals and the terminals 2211 of the switching device 221 can be achieved by providing threaded holes on the terminals 2211 and providing screw posts on the terminals, connecting them by screwing; or by welding.
[0055] As described above, the capacitor busbar 12 is located behind the mounting base 21, and the busbar 233 extends in the left-right direction, parallel to the surface of the capacitor busbar 12. Thus, in each single-phase switch group, the distance between each switch module connected to the capacitor busbar 12 via the busbar 233 is equal, and the commutation loop length of each switch module is also equal, reducing stray inductance and switching losses. Simultaneously, the busbar 233 includes two stacked copper busbars, which are respectively connected to the positive plate and neutral plate of the capacitor busbar. This stacked arrangement reduces stray inductance in the current loop.
[0056] Furthermore, in this embodiment, in each switch module, the first switch and the second switch are arranged vertically on the mounting base 21, and then each switch module is arranged side by side in the left-right direction. This shortens the size of the power module in the left-right direction and increases the size of the power module in the up-down direction. This makes the size of the power module more balanced in both the left-right and up-down directions. In addition to the advantage of being easy to implement and use, the mounting base 21 can also be used as a liquid cooling heat sink, and coolant can be introduced into the left or right end. Since the size in the left-right direction is shortened, the coolant can be better released at all positions of the mounting base 21, and the overall temperature uniformity of the mounting base 21 is better. Furthermore, a spare space is left on the lower side of the first mounting surface of the mounting base 21, that is, the part below the first switch. In the actual design of the coolant flow channel, the upper half of the mounting base 21 can be designed as the coolant inlet channel, while the lower half can be designed as the coolant return channel. The coolant temperature in the coolant inlet channel is lower, which can improve the cooling efficiency of the first switch 222 and the second switch 223 with higher temperature release. The coolant temperature in the coolant return channel is higher, which will not affect the cooling effect of the third switch 224 with lower temperature release.
[0057] Reference Figure 1 The absorption capacitor 30 includes several groups, and each group of absorption capacitors 30 includes at least one capacitor element 32. At the same time, each group of absorption capacitors 30 is provided with an outwardly extending conductive sheet 31. One end of the conductive sheet 31 is connected to all the capacitor elements 32 in the group of absorption capacitors 30, and the other end is connected to the corresponding terminal 2211 on the first switch 222 or the second switch 223.
[0058] Reference Figure 4 , Figure 5 and Figure 6 Each first switch 222 and each second switch 223 is connected to a set of absorption capacitors 30. The absorption capacitors 30 connected to the first switch 222 are located between the mounting base 21 and the capacitor busbar 12, and the absorption capacitors 30 connected to the second switch 223 are located on the side of the mounting base 21 away from the capacitor busbar 12.
[0059] The terminals 2211 of the first switch 222 and the second switch 223 are connected to the corresponding absorption capacitors 30. Terminal 2211 of the first switch 222 is sequentially connected to the absorption capacitor 30 and the wiring component 23, or sequentially connected to the wiring component 23 and the absorption capacitor 30; terminal 2211 of the second switch 223 is sequentially connected to the absorption capacitor 30 and the wiring component 23, or sequentially connected to the wiring component 23 and the absorption capacitor 30. The conductive piece 31 of the absorption capacitor 30 is connected to the terminals 2211 of the corresponding first switch 222 and / or second switch 223 via the first terminal 231 and the second terminal 232, or directly connected to the terminals 2211 of the corresponding first switch 222 and / or second switch 223.
[0060] In this embodiment, refer to Figure 4 One end of the first terminal 231 is connected to the terminal 2211 of the corresponding first switch 222, and cooperates with the terminal 2211 to clamp and connect the conductive piece 31 of the corresponding absorption capacitor 30. The second terminal 232 starts from the terminal 2211 of the corresponding second switch 223 and connects to the busbar 233 and the corresponding absorption capacitor 30 in sequence. Specifically, the conductive piece 31 of the absorption capacitor 30 may have an opening, and the screw post on the first terminal 231 can pass through the opening and then be screwed to the terminal 2211 of the first switch 222, thereby clamping the conductive piece 31 between the first terminal 231 and the terminal 2211. The conductive piece 31 of the absorption capacitor 30 corresponding to the second switch 223 may also have an opening, and then the conductive piece 31 can be fixed to the end of the second terminal 232 by bolts, or the conductive piece 31 can be directly fixed to the second terminal 232 by welding. (Refer to...) Figure 4 After the conductive sheet 31 of the absorption capacitor 30 extends horizontally outward from the absorption capacitor 30, it extends upward to form a bend. This bend allows part of the capacitor element 32 of the absorption capacitor 30 to be misaligned with the first terminal 231 and the second terminal 232 in the vertical direction, thereby allowing the absorption capacitor 30 to avoid the wiring component 23, while also facilitating the installation of the absorption capacitor 30.
[0061] In the power assembly provided by this invention, the mounting base 21 of the power module 20 is parallel to the capacitor busbar 12. Switching devices 221 are mounted on the mounting base 21 and connected to the capacitor busbar 12 via wiring components 23. A first switch 222 is arranged and fixed along a first direction on the first mounting surface 211 of the mounting base 21, and a second switch 223 is arranged and fixed along the first direction on the second mounting surface 212 of the mounting base 21. That is, the mounting positions of the first switch 222 and the second switch 223 are opposite to each other relative to the mounting base 21, and the arrangement directions of the first switch 222 and the second switch 223 are the same. Under this positional relationship, the distances from each first switch 222 to the capacitor busbar 12 are the same for both the first switch 222 and the second switch 223. Based on this, the absorption capacitor 30 is divided into two parts, one of which corresponds to… The first switch 222 and the other part correspond to the second switch 223. Each first switch 222 and the second switch 223 are connected to a set of absorption capacitors 30, so that the requirement of reducing stray inductance faced by each absorption capacitor 30 is consistent. Furthermore, the absorption capacitor 30 corresponding to the first switch 222 is located between the mounting base 21 and the capacitor busbar 12, while the absorption capacitor 30 corresponding to the second switch 223 is located outside the mounting base 21. Thus, the absorption capacitor 30 corresponding to the first switch 222 is closest to the first switch 222, and the absorption capacitor 30 corresponding to the second switch 223 is closest to the second switch 223. This maximizes the effect of the absorption capacitors 30 in reducing stray inductance and also makes the most of the space between the mounting base 21 and the capacitor busbar 12, avoiding the absorption capacitors 30 occupying too much space.
[0062] Example 2
[0063] 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.
[0064] 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 assembly characterized by, The application relates to a power supply device, which comprises: a capacitor module (10) comprising DC capacitor cells (11) and a capacitor busbar (12) connected with each other; the capacitor busbar (12) comprises several polar plates with different polarities; a power module (20) comprising a mounting base (21), a power tube group (22) and a wiring component (23); the power tube group (22) comprises several switching devices (221), wherein part of the switching devices (221) are connected with the capacitor busbar (12) through the wiring component (23) and are divided into first switches (222) and second switches (223) according to the connection relationship with the polar plates with different polarities on the capacitor busbar (12); the mounting base (21) is parallel to the capacitor busbar (12) and is provided with a first mounting surface (211) facing the capacitor busbar (12) and a second mounting surface (212) facing away from the capacitor busbar (12); each first switch (222) is arranged and fixed on the first mounting surface (211) along a first direction, and each second switch (223) is arranged and fixed on the second mounting surface (212) along the first direction; and several groups of absorption capacitors (30), each first switch (222) and each second switch (223) is correspondingly connected with a group of absorption capacitors (30), and the absorption capacitors (30) connected with the first switches (222) are located between the mounting base (21) and the capacitor busbar (12), and the absorption capacitors (30) connected with the second switches (223) are located on the side of the mounting base (21) facing away from the capacitor busbar (12); the first switches (222) and the second switches (223) are provided with wiring ends (2211) for being connected with the wiring component (23), and the wiring ends (2211) of each first switch (222) and each second switch (223) are further connected with the corresponding absorption capacitors (30).
2. A power pack as claimed in claim 1, characterised in that, the wiring ends (2211) of the first switches (222) are connected with the absorption capacitors (30) and the wiring component (23) in sequence or are connected with the wiring component (23) and the absorption capacitors (30) in sequence; the wiring ends (2211) of the second switches (223) are connected with the absorption capacitors (30) and the wiring component (23) in sequence or are connected with the wiring component (23) and the absorption capacitors (30) in sequence.
3. A power pack as claimed in claim 2, characterised in that, the absorption capacitors (30) are provided with conductive sheets (31) extending outward, the conductive sheets (31) are connected to the corresponding wiring ends (2211) of the first switches (222) or the second switches (223), so that the absorption capacitors (30) avoid the wiring component (23).
4. A power pack as claimed in claim 3, characterised in that, The wiring component (23) comprises a plurality of first wiring posts (231) and a plurality of second wiring posts (232); the wiring end (2211) of the first switch (222) is connected to the first wiring post (231), and the wiring end (2211) of the second switch (223) is connected to the second wiring post (232); the conductive sheet (31) of the absorption capacitor (30) is connected to the wiring end (2211) of the corresponding first switch (222) and / or second switch (223) through the first wiring post (231) and the second wiring post (232), or is directly connected to the wiring end (2211) of the corresponding first switch (222) and / or second switch (223).
5. A power pack as claimed in claim 4, characterised in that, The wiring component (23) further comprises a bus bar (233); the first switch (222) and the second switch (223) are both direct current side switching devices (221); in the direct current side switching device (221), the wiring end (2211) of part of the switching devices (221) is connected to the bus bar (233) through the corresponding first wiring post (231) or the second wiring post (232), and is connected to the capacitor bus (12) after being connected in parallel through the bus bar (233).
6. A power pack as claimed in claim 5, characterised in that The wiring end (2211) of each first switch (222) is directly connected to the capacitor bus (12) through the corresponding first wiring post (231); the wiring end (2211) of each second switch (223) is connected to the bus bar (233) through the corresponding second wiring post (232), and is connected to the capacitor bus (12) after being connected in parallel through the bus bar (233).
7. A power pack as claimed in claim 6, characterised in that One end of the first wiring post (231) is connected to the wiring end (2211) of the corresponding first switch (222), and the first wiring post (231) and the wiring end (2211) cooperate to clamp the conductive sheet (31) of the corresponding absorption capacitor (30); the second wiring post (232) starts from the wiring end (2211) of the corresponding second switch (223), and is sequentially connected to the bus bar (233) and the corresponding absorption capacitor (30).
8. A power pack as claimed in claim 7, characterised in that The conductive sheet (31) is provided with an opening; The first wiring post (231) is provided with a threaded post, the threaded post passes through the opening of the conductive sheet (31) of the absorption capacitor (30) corresponding to the first switch (222), and is then screwed to the wiring end (2211) of the first switch (222), so as to clamp the conductive sheet (31) between the first wiring post (231) and the wiring end (2211); The conductive sheet (31) of the absorption capacitor (30) corresponding to the second switch (223) is also provided with an opening, and is fixed to the end of the second wiring post (232) by a bolt, or the conductive sheet (31) of the absorption capacitor (30) corresponding to the second switch (223) is directly fixedly connected to the second wiring post (232) by welding; The conductive sheet (31) of the absorption capacitor (30) extends horizontally outward from the absorption capacitor (30), and then extends upward to form a bend, the bend makes the capacitor device (32) of the absorption capacitor (30) and the first terminal post (231) or the second terminal post (232) form a misalignment in the up-down direction, so that the absorption capacitor (30) can avoid the terminal component (23).
9. A power pack as claimed in any one of claims 1 to 8, wherein, The first direction is the length direction of the mounting base (21), the wiring ends (2211) of the first switch (222) and the second switch (223) are close to the same edge of the mounting base (21); the length direction of the mounting base (21) is perpendicular to the current-carrying direction of the capacitor busbar (12).
10. A current transformer characterized by A power assembly comprising a power component as claimed in any of claims 1-9.