Power module and inverter

Abstract

The utility model is applicable to the technical field of inverters, and provides a power module and an inverter, the power module comprises a capacitor unit and a power conversion assembly, the power conversion assembly comprises three-level power units and a heat dissipation assembly, the heat dissipation assembly is fixed on one side of the capacitor unit, a plurality of three-level power units are formed on the surface of the heat dissipation assembly, and the three-level power units are fixed on the surface of the heat dissipation assembly. The plurality of three-level power units are arranged along the vertical direction, so that the distances between the plurality of three-level power units and the capacitor unit are equal, the plurality of three-level power units are all connected with the capacitor unit, and the plurality of three-level power units are connected in parallel. Therefore, the plurality of three-level power units are connected in parallel, and the distances between the plurality of three-level power units and the capacitor are equal, so that the currents leading to different three-level power units are equal, the heat of the parallel three-level power units is uniform, and the heat dissipation effect of the power module is facilitated. And thus, the power module has more stable loading capacity.

Description

Technical Field

[0001] The utility model belongs to the technical field of inverters, and in particular relates to a power module and an inverter. Background Art

[0002] With the rapid development of new energy power generation systems, the demand for power is increasing. In terms of meeting the needs of high-power grid-connected power generation, connecting multiple groups of power devices in parallel has been widely recognized as an effective method to help expand the power density of the inverter. However, in related technologies, when a single capacitor uses a larger busbar, it is easy to cause uneven current in multiple groups of parallel power devices, which in turn causes some power devices to overheat, which is not conducive to heat dissipation. At the same time, due to the excessively high junction temperature of the power semiconductor device, the reliability may be reduced, thereby increasing the failure rate. Utility Model Content

[0003] The embodiment of the utility model provides a power module, which aims to solve the problem of excessive local temperature caused by uneven current of multiple groups of parallel power devices in an inverter.

[0004] An embodiment of the utility model is implemented as follows: the utility model provides a power module, including: a capacitor unit and a power conversion component, the power conversion component including a three-level power unit and a heat dissipation component, the heat dissipation component is fixed on one side of the capacitor unit, a plurality of the three-level power units are formed on the surface of the heat dissipation component, the plurality of the three-level power units are arranged along a vertical direction so that the distances between the plurality of the three-level power units and the capacitor unit are equal, the plurality of the three-level power units are all connected to the capacitor unit, and the plurality of the three-level power units are connected in parallel.

[0005] Furthermore, the three-level power unit includes two outer tube modules and one inner tube module, and the two outer tube modules and the one inner tube module are arranged in a triangular shape or in a straight shape;

[0006] In the case where the three-level power units are arranged in a triangular shape, the two outer tube modules are arranged along the vertical direction, and the inner tube module is arranged on a side of the two outer tube modules away from the capacitor unit;

[0007] When the three-level power units are arranged in a straight line, the two outer tube modules and the one inner tube module are arranged in sequence along the vertical direction.

[0008] Furthermore, the power module also includes a laminated copper busbar assembly, which includes a DC laminated copper busbar and an AC laminated copper busbar, the AC laminated copper busbar is respectively connected to the inner tube module and the outer tube module, and the DC laminated copper busbar is respectively connected to the outer tube module and the capacitor unit.

[0009] Furthermore, the DC laminated copper busbar includes a first connection surface, a second connection surface and a third connection surface which are connected in sequence, the first connection surface is used to connect the capacitor unit, the third connection surface is used to connect the terminal of the three-level power unit, the second connection surface is respectively connected to the first connection surface and the third connection surface and is bent relative to the first connection surface, and the first connection surface and the third connection surface are vertically arranged.

[0010] Furthermore, a transition surface is formed between the second connection surface and the third connection surface, the included angles between the transition surface and the second connection surface and the third connection surface are all obtuse angles, and the second connection surface and the third connection surface are arranged in parallel.

[0011] Furthermore, a chamfered portion is formed on a side of the second connection surface close to the first connection surface, and / or an insulating through hole is formed on the second connection surface.

[0012] Furthermore, the laminated copper busbar assembly also includes a capacitor positive copper busbar, a capacitor zero copper busbar and a capacitor negative copper busbar, and the power module includes three power conversion components, each of which is electrically connected to the capacitor positive copper busbar, the capacitor zero copper busbar and the capacitor negative copper busbar.

[0013] Furthermore, the capacitor unit includes a plurality of single DC capacitors;

[0014] The capacitor terminals of the single DC capacitor are respectively connected between the capacitor positive copper bar and the capacitor zero copper bar; or

[0015] The capacitor terminals of the single DC capacitor are respectively connected between the capacitor negative electrode copper bar and the capacitor zero electrode copper bar.

[0016] Furthermore, the heat dissipation assembly includes a heat sink and an air guide duct, the heat sink is formed on a surface of the air guide duct, and the three-level power unit is arranged on the surface of the heat sink.

[0017] An embodiment of the utility model further provides an inverter including a power module as described in any of the above embodiments.

[0018] In the power module and inverter of the embodiment of the present application, the power module includes a capacitor unit and a power conversion component, the power conversion component includes a three-level power unit and a heat dissipation component, the heat dissipation component is fixed on one side of the capacitor unit, and a plurality of three-level power units are formed on the surface of the heat dissipation component, and the plurality of three-level power units are arranged along the vertical direction so that the distances between the plurality of three-level power units and the capacitor unit are equal, the plurality of three-level power units are all connected to the capacitor unit, and the plurality of three-level power units are connected in parallel. In this way, the plurality of three-level power units are connected in parallel, and the distances between the plurality of three-level power units and the capacitor are equal, so that the currents to different three-level power units are equal, and the heat of each parallel three-level power unit is uniform, which is conducive to the heat dissipation effect of the power module, and thus makes the power module have a more stable load capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional diagram of a power module provided by an embodiment of the utility model;

[0020] Figure 2 It is a partial stereogram of a power module provided by an embodiment of the utility model;

[0021] Figure 3 It is a three-dimensional diagram of a DC laminated copper busbar provided by an embodiment of the utility model;

[0022] Figure 4 is another partial stereogram of the power module provided by the embodiment of the utility model;

[0023] Figure 5 It is a module diagram of the inverter provided in the embodiment of the utility model.

[0024] Description of Figure Numbers:

[0025] 100. Power module; 10. Capacitor unit; 11. Single DC capacitor; 12. Frame support structure; 20. Power conversion assembly; 21. Three-level power unit; 211. IGBT module; 2111. External tube module; 2112. Internal tube module; 22. Heat dissipation assembly; 221. Heat sink; 222. Air guide duct; 30. Laminated copper busbar assembly; 31. DC laminated copper busbar; 311. First connection surface; 3111. Chamfered portion; 312. Second connection surface; 3121. Insulating through hole; 313. Third connection surface; 314. Transition surface; 32. AC laminated copper busbar; 33. Capacitor positive copper busbar; 34. Capacitor zero-pole copper busbar; 35. Capacitor negative copper busbar; 200. Inverter. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0027] The embodiment of the utility model provides a power module and an inverter, in which different three-level power units are arranged at positions equidistant from the capacitor unit, so that the currents to different three-level power units are equal, and the heat of each parallel three-level power unit is uniform, which is helpful for the heat dissipation effect of the power module, thereby making the power module have a more stable load capacity, and avoiding the current unevenness of multiple groups of parallel power devices, thereby causing the problem of overheating of some power devices.

[0028] Embodiment 1

[0029] Reference Figure 1 and Figure 2 The present embodiment provides a power module 100, including: a capacitor unit 10 and a power conversion component 20, the power conversion component 20 including a three-level power unit 21 and a heat dissipation component 22, the heat dissipation component 22 is fixed on one side of the capacitor unit 10, a plurality of three-level power units 21 are formed on the surface of the heat dissipation component 22, the plurality of three-level power units 21 are arranged along a vertical direction so that the plurality of three-level power units 21 are at an equal distance from the capacitor unit 10, the plurality of three-level power units 21 are all connected to the capacitor unit 10, and the plurality of three-level power units 21 are connected in parallel.

[0030] In this embodiment, a plurality of three-level power units 21 are connected in parallel, and the distances between the plurality of three-level power units 21 and the capacitor are equal, so that the currents to different three-level power units 21 are equal, and the heat of each parallel three-level power unit 21 is uniform, which is helpful for the heat dissipation effect of the power module 100, thereby making the power module 100 have a more stable load capacity. In this embodiment, the specific type of the three-level power unit 21 is not limited to meet different needs. For example, the three-level power unit 21 can be a device module such as an insulated gate bipolar transistor (IGBT), a metal-oxide semiconductor field-effect transistor (MOSFET), an integrated gate-commutated thyristor (IGCT), etc., and the IGBT module is used as an example below. Exemplarily, the IGBT module 211 is a half-bridge structure and is connected to form a three-level circuit. The power module 100 further includes a capacitor unit 10 and three power conversion components 20 . Each power conversion component 20 includes nine IGBT modules 211 . Every three IGBT modules 211 are combined to form a three-level circuit, that is, a three-level power unit 21 .

[0031] In this embodiment, the current path lengths of the capacitor unit 10 connected to each parallel three-level circuit are slightly different, thereby achieving a better current balancing effect. The temperatures of the IGBT modules 211 in each parallel three-level circuit are substantially the same, thus avoiding overheating of some IGBT modules 211 due to uneven current distribution.

[0032] Embodiment 2

[0033] Reference Figure 2 On the basis of the above-mentioned first embodiment, the second embodiment of the utility model provides a power module 100, wherein the three-level power unit 21 includes two outer tube modules 2111 and one inner tube module 2112, and the two outer tube modules 2111 and one inner tube module 2112 are arranged in a triangular shape or in a straight shape;

[0034] When the three-level power unit 21 is arranged in a triangular shape, the two outer tube modules 2111 are arranged in a vertical direction, and the inner tube module 2112 is arranged on a side of the two outer tube modules 2111 away from the capacitor unit 10;

[0035] When the three-level power unit 21 is arranged in a straight line, two outer tube modules 2111 and one inner tube module 2112 are arranged in sequence along the vertical direction. (The straight line arrangement is not shown in the figure)

[0036] In this embodiment, by arranging the outer tube module 2111 and the inner tube module 2112 in a triangular or linear layout, the space can be effectively utilized, making the layout of the power unit more compact within a limited space and achieving high space utilization efficiency. In addition, the layout of the outer tube module 2111 and the inner tube module 2112 helps to achieve uniform heat distribution. For example, in the triangular layout, the inner tube module 2112 is located between the two outer tube modules 2111, away from the capacitor unit 10, which is beneficial to the rapid dissipation of heat, thus improving the heat dissipation efficiency. In this way, through reasonable layout, it helps to achieve uniform current distribution within the power unit, reduces the situation where current is concentrated in a certain unit, and thus improves the stability and reliability of the entire system. Such a layout method can not only improve the heat dissipation efficiency of the power module 100, but also help to improve the stability and reliability of the system, while simplifying the manufacturing and installation processes.

[0037] Embodiment Three

[0038] Referring to Figure 1 and Figure 2 On the basis of the above-mentioned Embodiment Two, the third embodiment of the present utility model provides a power module 100, wherein the power module 100 further includes a laminated copper busbar assembly 30. The laminated copper busbar assembly 30 includes a DC laminated copper busbar 31 and an AC laminated copper busbar 32. The AC laminated copper busbar 32 is respectively connected to the inner tube module 2112 and the outer tube module 2111, and the DC laminated copper busbar 31 is respectively connected to the outer tube module 2111 and the capacitor unit 10.

[0039] In this way, the design of the laminated copper busbar helps to achieve uniform current distribution within the module. By respectively connecting the outer tube module 2111 and the inner tube module 2112, the DC laminated copper busbar 31 and the AC laminated copper busbar 32 can effectively transmit current to different components, avoiding the situation where current is concentrated in some components and improving the stability of the system.

[0040] In this embodiment, the DC laminated copper busbar 31 includes a power positive copper busbar, a power zero copper busbar, a power negative copper busbar, an insulating film between the copper busbars, and insulating columns for fixing the copper busbars (not marked in the figure). The AC laminated copper busbar 32 includes an AC positive copper busbar, an AC negative copper busbar, an AC output copper busbar, an insulating film between the copper busbars, and insulating columns for fixing the copper busbars (not marked in the figure). The power conversion unit is electrically connected to the capacitor unit 10 through the laminated copper busbar. The capacitor positive copper busbar 33 is connected to the power positive copper busbar, the capacitor zero copper busbar 34 is connected to the power zero copper busbar, and the capacitor negative copper busbar 35 is connected to the power negative copper busbar. The inner tube module 2112 is connected to the outer tube module 2111 through the AC positive copper busbar and the AC negative copper busbar. The AC output of the three-level circuit is connected to other circuits in the inverter 200 through the AC output copper busbar.

[0041] Furthermore, the main function of the AC laminated copper busbar 32 is to connect the inner tube module 2112 and the outer tube module 2111, ensuring that the AC power can be stably transmitted inside the power module 100. The DC laminated copper busbar 31 connects the outer tube module 2111 and the capacitor unit 10, respectively, playing a key role in transmitting DC power and distributing power, effectively transmitting power and realizing the connection between various components.

[0042] Embodiment 4

[0043] Reference Figure 3 On the basis of the above-mentioned third embodiment, the fourth embodiment of the utility model provides a power module 100, wherein the DC laminated copper busbar 31 includes a first connection surface 311, a second connection surface 312 and a third connection surface 313 connected in sequence, the first connection surface 311 is used to connect the capacitor unit 10, the third connection surface 313 is used to connect the terminal of the three-level power unit 21, the second connection surface 312 is respectively connected to the first connection surface 311 and the third connection surface 313 and is bent relative to the first connection surface 311, and the first connection surface 311 and the third connection surface 313 are vertically arranged.

[0044] In this embodiment, the DC laminated copper busbar 31 is bent near the capacitor unit 10, that is, the second connection surface 312 is bent, so as to facilitate connection with the capacitor laminated copper busbar by bolts and increase the contact area. The DC laminated copper busbar 31 has two obtuse bends in the vertical direction in the middle. To avoid excessive stray inductance, the copper busbar needs to be as close to the IGBT module 211 as possible and cannot affect the position of the drive circuit. The bend in the middle of the copper busbar leaves enough space for the drive board to avoid spatial interference between the copper busbar and the drive circuit.

[0045] Specifically, the DC laminated copper busbar 31 is composed of a first connection surface 311, a second connection surface 312 and a third connection surface 313 connected in sequence. The first connection surface 311 is responsible for connecting to the capacitor unit 10, the third connection surface 313 is connected to the terminal of the three-level power unit 21, and the second connection surface 312 is connected to the first connection surface 311 and the third connection surface 313, and is slightly bent relative to the first connection surface 311. This arrangement makes the DC laminated copper busbar 31 more compact in layout and ensures that the current can be transmitted smoothly. In addition, the first connection surface 311 and the third connection surface 313 are arranged vertically, which not only helps to optimize the circuit layout, has high space utilization, but also is conducive to the uniform distribution of heat, thereby improving the heat dissipation effect and enhancing the stability and reliability of the system. The curved design of the second connection surface 312 makes the layout of the DC laminated copper busbar 31 more compact, saves space, and is conducive to the reduction of the overall size of the power module 100 and the improvement of power density.

[0046] Embodiment 5

[0047] Reference Figure 3 On the basis of the above-mentioned fourth embodiment, the fifth embodiment of the utility model provides a power module 100, wherein a transition surface 314 is formed between the second connection surface 312 and the third connection surface 313, and the angles between the transition surface 314 and the second connection surface 312 and the third connection surface 313 are all obtuse angles, and the second connection surface 312 and the third connection surface 313 are arranged in parallel.

[0048] In this embodiment, a transition surface 314 is formed between the second connection surface 312 and the third connection surface 313, which not only ensures the tightness of the connection, but also helps to optimize the transmission of current. An obtuse angle is formed between the transition surface 314 and the second connection surface 312 and the third connection surface 313, so that the current can flow to the IGBT module 211 from a shorter path, while reducing the copper bus area. At the same time, the second connection surface 312 and the third connection surface 313 are arranged in parallel, which not only makes the layout more neat, but also helps to optimize the space utilization efficiency of the power module 100, and improves the compactness and stability of the entire system. Such a design not only takes into account the smoothness of current transmission, but also takes into account the layout beauty and stability of the system, providing a reliable foundation for improving the performance of the power module 100. The obtuse angle design formed by the transition surface 314 helps to reduce the resistance of the connection, reduces the impedance of the current at the transition surface 314, thereby reducing energy loss and improving the efficiency of the circuit.

[0049] Embodiment 6

[0050] Reference Figure 3 Based on the above fourth embodiment, the sixth embodiment of the utility model provides a power module 100, wherein a chamfered portion 3111 is formed on a side of the second connection surface 312 close to the first connection surface 311, and / or an insulating through hole 3121 is formed on the second connection surface 312.

[0051] Thus, the chamfered portion 3111 of the copper bar ensures lower stray inductance and more uniform current density. The two insulating through holes 3121 of the copper bar facilitate fixing the copper bar on the heat dissipation assembly 22 to avoid stress on the electrical connection due to the excessive weight of the copper bar.

[0052] Specifically, a chamfered portion 3111 is formed on one side of the second connection surface 312 close to the first connection surface 311, which is conducive to optimizing the circuit layout and can effectively reduce the stress concentration at the connection, thereby improving the stability and reliability of the connection. At the same time, an insulating through hole 3121 is also formed on the second connection surface 312, which can help prevent the circuit from short-circuiting, reduce interference and noise in the circuit, and improve the stability and reliability of the system.

[0053] In a specific embodiment, a chamfered portion 3111 may be formed only on one side of the second connecting surface 312 close to the first connecting surface 311; or an insulating through hole 3121 may be formed only on the second connecting surface 312; or, while a chamfered portion 3111 is formed on one side of the second connecting surface 312 close to the first connecting surface 311, an insulating through hole 3121 may be formed on the second connecting surface 312.

[0054] Embodiment 7

[0055] Reference Figure 4 On the basis of the above-mentioned third embodiment, the seventh embodiment of the utility model provides a power module 100, wherein the laminated copper busbar assembly 30 also includes a capacitor positive copper busbar 33, a capacitor zero copper busbar 34 and a capacitor negative copper busbar 35, and the power module 100 includes three power conversion components 20, and each power conversion component 20 is electrically connected to the capacitor positive copper busbar 33, the capacitor zero copper busbar 34 and the capacitor negative copper busbar 35.

[0056] In this way, the reasonable connection of the capacitor positive copper bar 33, the capacitor zero copper bar 34 and the capacitor negative copper bar 35 ensures a stable electrical connection between the capacitor unit 10 and the power conversion component 20. It helps to reduce the current and voltage fluctuations in the system and enhance the stability and reliability of the system. By directly connecting key components such as the power conversion component 20 and the capacitor unit 10, additional wiring and connectors are avoided, making the circuit layout more concise and clear, and simplifying the circuit layout.

[0057] Specifically, the laminated copper bar assembly 30 not only includes a DC laminated copper bar 31 and an AC laminated copper bar 32, but also includes components such as a capacitor positive copper bar 33, a capacitor zero-pole copper bar 34, a capacitor negative copper bar 35, and an insulating film between the copper bars. These copper bars are responsible for connecting other components to achieve the transmission and distribution of electric power. Each power conversion assembly 20 is electrically connected to the capacitor positive copper bar 33, the capacitor zero-pole copper bar 34, and the capacitor negative copper bar 35, respectively, to ensure that electric current can be smoothly transmitted from the capacitor unit 10 to the power conversion assembly 20, to achieve the conversion and control of power. In this way, not only the circuit connection of the system is made clearer and more concise, but also the stability and reliability of the system are improved, and a reliable basis is provided for the efficient operation of the power module 100.

[0058] Embodiment 8

[0059] Reference Figure 1 and Figure 4 , based on the seventh embodiment above, the eighth embodiment of the present utility model provides a power module 100, wherein the capacitor unit 10 includes a plurality of single DC capacitors 11;

[0060] The capacitor terminals of the single DC capacitor 11 are respectively connected between the capacitor positive copper bar 33 and the capacitor zero copper bar 34; or

[0061] The capacitor terminals of the single DC capacitor 11 are respectively connected between the capacitor negative electrode copper bar 35 and the capacitor zero electrode copper bar 34 .

[0062] Thus, in the capacitor unit 10, the capacitor terminals of each single DC capacitor 11 are respectively connected between the capacitor positive copper bar 33 and the capacitor zero copper bar 34, or connected between the capacitor negative copper bar 35 and the capacitor zero copper bar 34. In this way, it is ensured that the positive and negative electrodes of the capacitors in the capacitor unit 10 are correctly connected to other components in the power module 100, thereby ensuring the effective transmission and utilization of electric energy. By directly connecting the capacitor terminals and the copper bar, the resistance and fault points that may be generated by the connector and the connecting wire are reduced, the failure rate of the system is reduced, and the performance and reliability of the system are improved.

[0063] Specifically, the capacitor unit 10 includes a frame support structure 12 and a single DC capacitor 11. The frame support structure 12 plays a role in fixing the position of the single DC capacitor 11 and has a certain mechanical strength. The frame support structure 12 has multiple openings to force air flow through, which is convenient for the capacitor to dissipate heat.

[0064] Further, the DC capacitor is a plurality of single DC capacitors 11, and the capacitor terminals are respectively connected between the positive copper bar 33 of the capacitor and the zero-pole copper bar 34 of the capacitor, and between the negative copper bar 35 of the capacitor and the zero-pole copper bar 34 of the capacitor. The number of capacitors between the positive copper bar 33 of the capacitor and the zero-pole copper bar 34 of the capacitor is the same as the number of capacitors between the negative copper bar 35 of the capacitor and the zero-pole copper bar 34 of the capacitor. The bottom of the capacitor is arranged in a vertical plane and mechanically connected to the frame support structure 12 by bolts. The capacitors between the positive copper bar 33 of the capacitor and the zero-pole copper bar 34 of the capacitor and the capacitors between the negative copper bar 35 of the capacitor and the zero-pole copper bar 34 of the capacitor are alternately arranged to make the positive and negative bus voltages symmetrical, and the current density distribution of each copper bar is more uniform, so as to avoid excessive current density at a single point of the copper bar, resulting in serious heating.

[0065] Embodiment 9

[0066] Reference Figure 1 and Figure 2 On the basis of the above-mentioned eighth embodiment, the ninth embodiment of the present utility model provides a power module 100, wherein the heat dissipation component 22 includes a heat sink 221 and an air guide duct 222, the heat sink 221 is formed on the surface of the air guide duct 222, and the three-level power unit 21 is arranged on the surface of the heat sink 221.

[0067] In this way, the combination of the heat sink 221 and the air duct 222 significantly improves the heat dissipation efficiency. The heat sink 221 is closely attached to the surface of the air duct 222, effectively expanding the heat dissipation area, and the air duct 222 is used to guide the flow of external air, which promotes the transfer and dissipation of heat, thereby improving the heat dissipation efficiency of the entire system. In addition, by arranging the three-level power unit 21 on the surface of the heat sink 221, it is ensured that the three-level power unit 21 is away from the airflow generated by the air duct 222, avoiding the influence of possible risk factors on the three-level power unit 21. Such a design helps to maintain a suitable operating temperature of the three-level power unit 21 and improve the stability and reliability of the system.

[0068] In this embodiment, the heat dissipation assembly 22 includes a heat sink 221 and an air duct 222, each phase is a heat dissipation assembly 22, and each heat dissipation assembly 22 is arranged in the horizontal direction. The heat sink 221 is tightly fitted on the surface of the air duct 222 to form a whole, and the IGBT module 211 is in close contact with the surface of the heat sink 221, and a heat conductive material is applied to the contact surface. The three-level power unit 21 is arranged on the other side of the heat sink 221, away from the air duct 222. This design is intended to effectively dissipate heat through the heat sink 221 and guide the external air flow through the air duct 222, thereby maintaining a suitable temperature of the power unit. Such a layout not only helps to improve the heat dissipation efficiency, but also effectively reduces the risk of the power unit being affected by the external environment.

[0069] Furthermore, the IGBT module 211 should be as close to the capacitor unit 10 as possible, the IGBT power terminal should be perpendicular to the capacitor copper bar, the IGBT parallel extension direction should be parallel to the capacitor copper bar, and the distance between each parallel IGBT and the capacitor module should be equal, so that the size of the DC laminated copper bar 31 connected thereto can be reduced, and the DC voltage can be connected to the IGBT input side with a shorter path, which can save costs and form a lower stray inductance. The AC laminated copper bar 32 needs to be as close to the IGBT as possible, and in order to leave enough space for the driver board, a bend is also set in the AC output copper bar part, and the AC output copper bar is a certain distance higher than the AC positive copper bar and the AC negative copper bar.

[0070] Embodiment 10

[0071] Reference Figure 5 This embodiment further provides an inverter 200, which includes a power module 100 as described in any of the above embodiments.

[0072] This embodiment provides an inverter 200 and a three-level power module 100 of the inverter 200, which is conducive to current sharing of multiple groups of parallel IGBTs, and the heat of each parallel IGBT is uniform, which helps the heat dissipation effect of the IGBT, so that the inverter 200 has a stable load capacity. Specifically, the inverter 200 is a three-phase circuit, and the power conversion unit of each phase is the same. The power conversion unit of each phase is connected to the capacitor unit 10 along the horizontal direction.

[0073] In the power module and inverter of the embodiment of the present application, the power module includes a capacitor unit and a power conversion component, the power conversion component includes a three-level power unit and a heat dissipation component, the heat dissipation component is fixed on one side of the capacitor unit, and a plurality of three-level power units are formed on the surface of the heat dissipation component, and the plurality of three-level power units are arranged along the vertical direction so that the distances between the plurality of three-level power units and the capacitor unit are equal, the plurality of three-level power units are all connected to the capacitor unit, and the plurality of three-level power units are connected in parallel. In this way, the plurality of three-level power units are connected in parallel, and the distances between the plurality of three-level power units and the capacitor are equal, so that the currents to different three-level power units are equal, and the heat of each parallel three-level power unit is uniform, which is conducive to the heat dissipation effect of the power module, and thus makes the power module have a more stable load capacity.

[0074] It is understandable that those skilled in the art can, under the guidance of the above embodiments, combine various implementation methods in the above embodiments to obtain technical solutions of multiple implementation methods.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A power module, characterized in that: include: A capacitor unit and a power conversion component, wherein the power conversion component includes a three-level power unit and a heat dissipation component, wherein the heat dissipation component is fixed to one side of the capacitor unit, and a plurality of the three-level power units are formed on the surface of the heat dissipation component, wherein the plurality of the three-level power units are arranged in a vertical direction so that the distances between the plurality of the three-level power units and the capacitor unit are equal, the plurality of the three-level power units are all connected to the capacitor unit, and the plurality of the three-level power units are connected in parallel.

2. The power module according to claim 1, characterized in that: The three-level power unit comprises two outer tube modules and one inner tube module, and the two outer tube modules and the inner tube module are arranged in a triangular shape or in a straight shape; In the case where the three-level power units are arranged in a triangular shape, the two outer tube modules are arranged along the vertical direction, and the inner tube module is arranged on a side of the two outer tube modules away from the capacitor unit; When the three-level power units are arranged in a straight line, the two outer tube modules and the one inner tube module are arranged in sequence along the vertical direction.

3. The power module according to claim 2, characterized in that: The power module also includes a laminated copper busbar assembly, which includes a DC laminated copper busbar and an AC laminated copper busbar. The AC laminated copper busbar is respectively connected to the inner tube module and the outer tube module, and the DC laminated copper busbar is respectively connected to the outer tube module and the capacitor unit.

4. The power module according to claim 3, characterized in that: The DC laminated copper busbar includes a first connection surface, a second connection surface and a third connection surface which are connected in sequence, the first connection surface is used to connect the capacitor unit, the third connection surface is used to connect the terminal of the three-level power unit, the second connection surface is respectively connected to the first connection surface and the third connection surface and is bent relative to the first connection surface, and the first connection surface and the third connection surface are vertically arranged.

5. The power module according to claim 4, characterized in that: A transition surface is formed between the second connection surface and the third connection surface, and the included angles between the transition surface and the second connection surface and the third connection surface are all obtuse angles. The second connection surface and the third connection surface are arranged in parallel.

6. The power module according to claim 4, characterized in that: A chamfered portion is formed on a side of the second connection surface close to the first connection surface, and / or an insulating through hole is formed on the second connection surface.

7. The power module according to claim 3, characterized in that: The laminated copper busbar assembly also includes a capacitor positive copper busbar, a capacitor zero copper busbar and a capacitor negative copper busbar. The power module includes three power conversion components, each of which is electrically connected to the capacitor positive copper busbar, the capacitor zero copper busbar and the capacitor negative copper busbar.

8. The power module according to claim 7, characterized in that: The capacitor unit includes a plurality of single DC capacitors; The capacitor terminals of the single DC capacitor are respectively connected between the capacitor positive copper bar and the capacitor zero copper bar; or The capacitor terminals of the single DC capacitor are respectively connected between the capacitor negative electrode copper bar and the capacitor zero electrode copper bar.

9. The power module according to claim 1, characterized in that: The heat dissipation assembly includes a heat sink and an air guide duct. The heat sink is formed on a surface of the air guide duct, and the three-level power unit is arranged on the surface of the heat sink.

10. An inverter, characterized in that: Comprising a power module as described in any one of claims 1-9.

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