阅读说明：本技术 一种逆变器的四并联功率模块组 (Four-parallel power module group of inverter ) 是由 张融森 胡雷雷 周俊杰 邵晗 张燕 于 2020-05-14 设计创作，主要内容包括：本发明公开了一种逆变器的四并联功率模块组,其中每个功率模块包括多个IGBT模块、功率母排、散热组件和用于固定上述模块组件的功率模块壳体组件等。所述IGBT模块为功率模块核心组件；所述功率母排用于连接IGBT模块与电容母排；所述散热组件主要为散热器,用于为IGBT散热和固定IGBT等组件；所述壳体组件由功率模块壳体和部分绝缘支撑件组成,用于固定散热器等器件。一个功率模块中包含的多个IGBT模块共用一个散热器,布局紧凑,有效提高了散热器的散热效率,同时也降低了组装过程中的复杂性。功率模块设计安装位置在电容模块的后方,避免了二者上下安装时电容模块直接压在功率母排上所导致的功率母排损坏。(The invention discloses a four-parallel power module group of an inverter, wherein each power module comprises a plurality of IGBT modules, a power bus bar, a heat dissipation assembly, a power module shell assembly for fixing the module assembly and the like. The IGBT module is a power module core component; the power bus bar is used for connecting the IGBT module and the capacitor bus bar; the heat dissipation assembly is mainly a radiator and is used for dissipating heat of the IGBT and fixing the IGBT and other assemblies; the shell assembly consists of a power module shell and a part of insulating support and is used for fixing devices such as a radiator and the like. A plurality of IGBT modules contained in one power module share one radiator, the layout is compact, the radiating efficiency of the radiator is effectively improved, and meanwhile, the complexity in the assembling process is also reduced. The designed installation position of the power module is behind the capacitor module, so that the damage of the power busbar caused by the fact that the capacitor module is directly pressed on the power busbar when the capacitor module and the capacitor module are installed up and down is avoided.)

1. The four-parallel power module group of the inverter is characterized by comprising a capacitor module (200) and three power modules (100), wherein each power module (100) comprises a heat dissipation assembly and a plurality of IGBT modules (1), the plurality of IGBT modules (1) contained in the same power module (100) share the same heat dissipation assembly and are fixed on the same heat dissipation assembly, and the layout form is an upper row and a lower row; all the IGBT modules (1) are divided into four groups, and the four groups of IGBT modules (1) are connected in parallel; each group of IGBT modules is connected with the output end of the power busbar (3), the input end of the power busbar (3) is connected with the first end of the capacitor busbar (21), and the second end of the capacitor busbar (21) is connected with the capacitor module (200).

2. The set of four parallel power modules of an inverter according to claim 1, characterized in that an insulating assembly (10) is arranged between the positive and negative poles of the IGBT module (1).

3. The four-parallel power module group of the inverter according to claim 1, wherein the power bus bar (3) is a laminated bus bar formed by alternately laminating four layers of insulating films with positive, negative and negative electrodes, and the positive, negative and zero electrodes are provided with cutting grooves (19) at the side close to the input end.

4. The set of four parallel power modules of an inverter according to claim 1, wherein the power busbar (3) is fixedly connected to the heat sink (2) by a Z-shaped insulating support (6) and to the power module housing assembly (13) by an insulator (24).

5. The set of four parallel power modules of an inverter according to claim 1, wherein the IGBT modules (1) are 600A IGBT modules (1).

6. The set of four parallel power modules of an inverter according to claim 1, wherein the power modules (100) are mounted on the back of the capacitor module (200).

7. The set of four parallel power modules of an inverter according to claim 1, wherein the power modules (100) and the capacitor bus bars (21) are perpendicular to each other.

8. The four-parallel power module group of the inverter according to claim 1, wherein the heat dissipation assembly is externally coated with a power module housing assembly (13), the power module housing assembly (13) is formed by combining and splicing four sheet metal parts, and the power module housing assembly (13) is fixed with the heat dissipation assembly through a fastener and a sealing strip (12).

9. The set of four parallel power modules of an inverter according to claim 1, wherein the power module (100) is provided with a handle (26) near one end of the capacitor module (200).

10. The four-parallel power module group of the inverter according to claim 1, wherein the IGBT module (1) is covered with a driving board (5), the driving board (5) is connected with pins on the IGBT module (1), and the driving board (5) is fixed on the heat dissipation assembly through a hexagonal nylon support column (15).

Technical Field

The invention belongs to the technical field of photovoltaic grid-connected inverters, and particularly relates to a four-parallel power module group of an inverter.

Background

As an important component of new energy industry, photovoltaic grid-connected inverters have been rapidly developed in recent years, conversion efficiency is higher and higher, and overall power is higher and higher. The power module, as a core component of the photovoltaic inverter, is also developed towards high integration and high compact structure of the module, but in the practical application of the high-power inverter, there are some disadvantages.

1) As a high-power-consumption device, the working temperature of a power module can reach 90-100 ℃, which has high requirements on the heat dissipation structure and efficiency of the inverter, and the 1400A IGBT module used in the prior product has the defects of large volume of a single IGBT module, concentrated heat-emitting point positions, inconvenience for heat dissipation of a radiator, more and unreasonable heat dissipation structure design and low heat dissipation efficiency.

2) The core device IGBT of the power module is monopolized by foreign technology companies all the time, so that the price cost is high, and the 1400A IGBT module commonly used in the previous products has the problems of insufficient capacity, low supply quantity and the like recently.

3) In addition, the power module of the inverter is formed by combining various components, and if the structural layout distribution is unreasonable, the problems of overlarge overall size of the module, low space utilization efficiency and the like can be caused.

Disclosure of Invention

The invention aims to provide a power module group which is high in heat dissipation efficiency, compact in structure and convenient to maintain at a later stage.

In order to achieve the above purpose, the four-parallel power module group of the inverter comprises a capacitor module and three power modules, wherein each power module comprises a heat dissipation assembly and a plurality of IGBT modules, the plurality of IGBT modules contained in the same power module share the same heat dissipation assembly and are fixed on the same heat dissipation assembly, and the layout form is an upper row and a lower row; all the IGBT modules are divided into four groups, and the four groups of IGBT modules are connected in parallel; each group of IGBT modules is connected with the output end of the power busbar, the input end of the power busbar is connected with the first end of the capacitor busbar, and the second end of the capacitor busbar is connected with the capacitor module.

Further, an insulating assembly is arranged between the positive electrode and the negative electrode of the IGBT module.

Furthermore, the power busbar is a laminated busbar and is formed by alternately overlapping four layers of insulating films with a positive electrode, a negative electrode and a negative electrode, and the sides of the positive electrode, the negative electrode and the zero electrode, which are close to the input end, are provided with cutting grooves.

Furthermore, the power busbar is fixedly connected with the radiator through a Z-shaped insulating support piece and fixedly connected with the power module shell assembly through an insulator.

Further, the IGBT module adopts a 600A IGBT module.

Further, the power module is mounted on the back of the capacitor module.

Furthermore, the power module is perpendicular to the capacitor busbar.

Furthermore, a power module shell assembly is coated outside the heat dissipation assembly, the power module shell assembly is formed by combining and splicing four sheet metal parts, and the power module shell assembly is fixed with the heat dissipation assembly through a fastening piece and a sealing strip.

Furthermore, a handle is arranged at one end of the power module close to the capacitor module.

Furthermore, the IGBT module is covered with a driving board, the driving board is connected with pins on the IGBT module, and the driving board is fixed on the heat dissipation assembly through a hexagonal nylon support column.

Compared with the prior art, the invention has at least the following beneficial technical effects:

the IGBT module is directly fixed on the radiator, the plurality of IGBT modules are arranged on the same radiator, under the condition that the size of the IGBT module is reduced, the heat dissipation points of the radiator are more uniform, the heat dissipation efficiency of the radiator is fully utilized, the number of power modules is also reduced, under the highly-integrated power module, the inverter structure is simplified, and the installation and the disassembly are more efficient and rapid.

Furthermore, an insulating assembly is arranged between the positive electrode and the negative electrode of the IGBT module, and the positive electrode and the negative electrode are separated by the insulating assembly so as to increase the electric gap and the creepage distance.

Furthermore, the power busbar is a laminated busbar and is formed by overlapping four layers of insulating films with positive, negative and negative electrodes in a staggered mode, the sides, close to the input end, of the positive electrodes, the negative electrodes and the zero electrodes are provided with cutting grooves, the cutting grooves are used for improving uneven current density generated when current flows from the capacitor module to the power module, a plurality of press rivet nuts are installed at the input end of each electrode power busbar, the press rivet nuts are conveniently connected with the capacitor busbar, and the assembly and disassembly are more convenient.

Furthermore, the power busbar is connected with the radiator through a Z-shaped insulating support piece and connected with the power module shell assembly through an insulator. The Z-shaped insulating support piece can reduce the material consumption of the power busbar on the premise of meeting the use condition, reduce the cost and improve the reliability of fixing the power busbar. If the power busbars with different specifications are matched, the height can be adjusted by installing an insulating gasket below the insulator.

Furthermore, the power busbar structure is related to the IGBT module and PCBA circuit board structure, different IGBT modules, series-parallel connection forms and PCBA circuit boards are used in the prior art, the special-shaped power busbar with a complex structure can be caused, and finally the processing cost of the power busbar is overhigh.

Furthermore, the power module and the capacitor module are arranged front and back in space, so that the power bus bar is prevented from being damaged due to the fact that the capacitor module extrudes the power bus bar for a long time when the power module and the capacitor module are connected up and down. And the capacitor module can be maintained in the later period by opening the front door of the inverter cabinet, and the assembly and disassembly are convenient.

Furthermore, the power module is vertically connected with the capacitor busbar through the power busbar, the self weight of the power module and the weight of the capacitor module are born by the sheet metal support piece in the inverter cabinet, and the power busbar damage caused by the fact that the capacitor module extrudes the power busbar for a long time when the power module and the capacitor module are connected from top to bottom is avoided.

Drawings

Fig. 1 is an overall layout diagram of an IGBT module of the invention;

FIG. 2 is an overall external view of the power module of the present invention;

FIG. 3a is an enlarged view of a portion A of FIG. 1;

FIG. 3B is a partial enlarged view of FIG. 2 at B;

FIG. 4 is a schematic diagram of a power bus bar according to the present invention;

FIG. 5 is an overall view of the power module set and the capacitor module according to the present invention;

FIG. 6 is a schematic view of a support member.

In the drawings: 1. an IGBT module, 2, a radiator, 3, a power bus bar, 4, a parallel bus bar, 5, a driving board, 6, an insulating support piece, 9, a power module output end, 10, an insulating assembly, 12, a sealing strip, 13, a power module shell assembly, 14, an IGBT module pin, 15, a hexagonal nylon support column, 16, a power bus bar output end, 17, a power bus bar input end, 18, an insulating film, 19, a cutting groove, 20, a capacitor, 21, a capacitor bus bar, 22, a capacitor module shell, 24, an insulator, 25, an insulating gasket, 26, a handle, 100, a power module, 200 and a capacitor module.

Detailed Description

In order to make the objects and technical solutions of the present invention clearer and easier to understand. The present invention will be described in further detail with reference to the following drawings and examples, wherein the specific examples are provided for illustrative purposes only and are not intended to limit the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A four-parallel power module group of an inverter comprises a capacitor module 200 and three power modules 100, wherein each power module 100 comprises a plurality of IGBT modules 1, a power busbar 2, a heat dissipation assembly, a power module shell assembly 13 for fixing the module assemblies and the like. The IGBT module 1 is a power module core component; the power bus bar 3 is used for connecting the IGBT module 1 and the capacitor bus bar 21; the heat dissipation component is mainly a radiator 2 and is used for dissipating heat of the IGBT and fixing the components such as the IGBT and the like; the module housing assembly 13 is composed of a power module housing and a partially insulating support member for fixing devices such as a heat sink. The plurality of IGBT modules 1 contained in one power module 100 share one radiator 2, the layout is compact, the radiating efficiency of the radiator is effectively improved, and meanwhile, the complexity in the assembling process is also reduced. The designed installation position of the power module 100 is behind the capacitor module 200, so that the damage of the power busbar 3 caused by the fact that the capacitor module 200 is directly pressed on the power busbar 3 when the capacitor module and the capacitor module are installed up and down is avoided.

Fig. 1 is an overall layout diagram of IGBT modules of an inverter type suitable for a single-machine rated power of 1.25MW, the 12 IGBT modules 1 are directly fixed above the heat sink 2, the layout form of the 12 IGBT modules 1 is two rows up and down, and three groups from left to right, four groups in total, are in a four-parallel connection form. The single IGBT module is connected with the radiator through the inner hexagonal socket head combined screw at four corners, the three IGBT modules are in a group and are connected with each other through the parallel copper bar, and each group of IGBT modules is connected with the output end of the power busbar 3. The power module shell assembly 13 is formed by combining and splicing 4 sheet metal parts, and is fixed with the radiator 2 into a whole through a fastener and a sealing strip 12, the sealing strip plays a role in sealing, fixing stability and buffering, and the sealing strip adopts an adhesive tape. The front end of the power module 1 is designed as a handle, and the power module 100 can be mounted and dismounted by a single person. 12 IGBT modules 1 of 600A are arranged on one radiator 2, radiating positions are dispersed, radiating efficiency of the radiator 2 is fully utilized, the number of power modules is reduced, an inverter structure is simplified, and installation and disassembly are more convenient.

Fig. 2 is an overall outline diagram of the power module of the present invention, and two driving boards 5 are respectively covered on the upper row of IGBT modules and the lower row of IGBT modules and connected by a plurality of pins on the IGBT module 1. In order to improve the reliability of the connection between the driving board 5 and the IGBT module 1, the driving board 5 is connected with the power module shell assembly 13 or the radiator 2 through a plurality of hexagonal nylon support columns 15, one ends of the hexagonal nylon support columns 15 are externally threaded and connected with the radiator, and the other ends of the hexagonal nylon support columns 15 are internally threaded and connected with the driving board 5 through screws.

Fig. 3a and 3b are schematic diagrams of the terminal insulation assembly of the IGBT module according to the present invention, in which the anode and cathode of the IGBT module according to the present invention are separated by a transparent insulation assembly 10 to increase the electrical gap and creepage distance, and the transparent insulation assembly is fixed above the heat sink by a fastening member. Preferably, the insulating component is made of transparent materials, and therefore attractiveness is improved.

Fig. 4 is a partial outline view of the power bus bar of the present invention, in which the power bus bar 3 is connected to the IGBT module 1, connected to the heat sink 2 through the Z-shaped insulating support 6, and connected to the power module case assembly 13 through the insulator 24; referring to fig. 6, the Z-shaped insulating support member 6 can reduce material consumption of the power busbar on the premise of satisfying the use condition, thereby reducing the cost and improving the reliability of fixing the power busbar. If power busbars with different specifications are matched, the height can be adjusted by installing an insulating gasket 25 below the insulator 24. The power bus-bar 3 is a laminated bus-bar, is formed by overlapping four layers of insulating films with positive, zero and negative poles in a staggered manner, and sequentially comprises a first layer of insulating film, a positive pole, a second layer of insulating film, a zero pole, a third layer of insulating film, a negative pole and a fourth layer of insulating film from top to bottom. The positive pole, the negative pole and the zero pole are provided with cutting grooves 19 close to the input end side for improving the uneven current degree generated when the current goes from the capacitor module 200 to the power module 100, each pole power busbar input end is provided with a plurality of pressure riveting nuts, the pressure riveting nuts are conveniently connected with the capacitor busbar 21, and the dismounting is more convenient.

Fig. 5 is an overall outline diagram of the power module group and the capacitor module according to the present invention, in which direct current converted by the photovoltaic module is collected and converted into initial alternating current by the capacitor filter module and the power module, and then the initial alternating current is output to a subsequent module through the output end 9 of the power module, so that alternating current meeting the use requirement is finally obtained. The power module group comprises three power modules 100 and a capacitor module 200, wherein the capacitor module 200 is composed of a capacitor module shell 22, a capacitor bus bar 21 and a plurality of capacitors 20. Install a plurality of electric capacity 20 in the capacitor module casing 22, the one end of all electric capacity 20 is connected with female 21 of arranging of same electric capacity, arrange 3 and the female 21 interconnect of electric capacity through power between power module 100 and the capacitor module 200, female 21 of arranging of electric capacity is connected with capacitor module 200, IGBT module 1 in the power module 100 arranges 3 and the female 21 of arranging of electric capacity is connected through power, female 21 of arranging of electric capacity is connected with capacitor module 200, female 3 of arranging of power and the female 21 mutually perpendicular of electric capacity. Capacitor module 200 is the front and back position with power module 100 and arranges, the capacitor 200 module is in the front, power module 100 is in the back, open inverter cabinet qianmen and can carry out the later maintenance to capacitor module 200, easy dismounting, power module 100 is arranged 3 through the power and is arranged 21 with the electric capacity and be perpendicular connection, power module 100 relies on the interior panel beating support piece of inverter cabinet with capacitor module 200's self weight to bear, the female damage of arranging of power that leads to of capacitor module long-term extrusion power when having avoided both because of connecting from top to bottom.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.