CN219535904U - Inversion unit and cabinet structure - Google Patents

Abstract

The utility model provides an inversion unit and a cabinet body structure, wherein the inversion unit comprises at least one module, the module comprises a plurality of IGBT modules, and the IGBT modules are two-level IGBT modules; each IGBT module is arranged on the radiator in a straight shape, an external air channel of the radiator forms a preset angle with the arrangement direction of each IGBT module, and radiates heat to each IGBT module at the same time; through the in-line arrangement of the IGBT modules and the air duct direction design, heat accumulation on the mounting surface of the IGBT modules can be improved, the heat dissipation efficiency of the power device is improved, and the power density of the whole machine is improved. Moreover, module subassembly and direct current capacitance subassembly in this cabinet body structure set up in last cabinet behind the box, and this last cabinet is detachable, when module subassembly breaks down, only through tearing open and changing this last cabinet, can accomplish the operation in the shorter time, be applicable to non-professional, reduced the maintenance degree of difficulty, promoted maintenance speed.

Description

Inversion unit and cabinet structure

Technical Field

The utility model relates to the technical field of power electronics, in particular to an inversion unit and a cabinet structure.

Background

As the photovoltaic grid-connected inverter is used as an interface device of a solar power generation system and a power grid, the demand for higher power of the photovoltaic grid-connected inverter is increasingly strong along with the realization of low-price internet surfing of a large photovoltaic power station. Higher power means lower cost per watt and more obvious effect on low-priced surfing.

In order to improve the power grade of the inverter, a plurality of IGBT parallel schemes are needed, and heat accumulation of a radiator provided with the IGBT is caused, so that the heat dissipation efficiency is affected, the power of the whole machine is limited, and the like.

Disclosure of Invention

In view of this, the present utility model provides an inverter unit and a cabinet structure to improve the heat dissipation efficiency of the power device and the power density of the whole machine.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the first aspect of the present utility model provides an inverter unit including: at least one module;

the module comprises a plurality of IGBT modules;

the IGBT module is a two-level IGBT module;

each IGBT module is arranged on the radiator in a straight shape;

and the external air channel of the radiator forms a preset angle with the arrangement direction of each IGBT module, and radiates heat to each IGBT module at the same time.

Optionally, the module is a multi-level topology.

Optionally, the module is: neutral point clamped NPC topology, or active neutral point clamped ANPC topology;

each IGBT module in the module is respectively: the first IGBT module, the second IGBT module and the third IGBT module;

two input ends of the first IGBT module are respectively connected with the positive electrode and the middle point of the direct current capacitor assembly;

two input ends of the second IGBT module are respectively connected with the negative electrode and the middle point of the direct-current capacitor assembly;

and two input ends of the third IGBT module are respectively connected with the output end of the first IGBT module and the output end of the second IGBT module, and the output end of the third IGBT module is connected with the alternating current filtering module.

Optionally, the number of the third IGBT modules in the module is greater than 1.

Optionally, the preset angle is 90 °.

A second aspect of the present utility model provides a cabinet structure comprising: the device comprises a module assembly, a direct current capacitor assembly, a box body and an upper cabinet; wherein,,

the module assembly and the direct current capacitor assembly are integrated in the box body; the direct-current capacitor assembly is arranged on the upper side of the module assembly;

the box body is arranged in the upper cabinet;

the module assembly includes: a radiator and an inverter unit provided on the radiator as described in any one of the first aspects above.

Optionally, the radiator is a thermosiphon phase change radiator;

in the thermosiphon phase-change radiator, a condenser is positioned at the upper end of an evaporator, and an included angle exists between the condenser and the evaporator;

the external air channel of the condenser is the external air channel of the radiator.

Optionally, the direction of the external air duct of the condenser is vertical or horizontal; and/or the number of the groups of groups,

the fan of the external air duct of the condenser is arranged under or over the evaporator or is vertical to the condenser.

Optionally, the included angle is greater than or equal to 90 ° and less than or equal to 180 °.

Optionally, the radiator is a relieved tooth radiator.

Optionally, the method further comprises: and the control component is integrated in the box body.

Optionally, an air inlet and an air outlet are arranged in the upper cabinet, the number of the air inlet and the number of the air outlet are all greater than or equal to 1, and the air inlet and the air outlet are respectively positioned on the top surface and the side surface of the upper cabinet.

Optionally, the wind gap that is located the upper cabinet top surface is special-shaped structure.

Optionally, the method further comprises: an air-air heat exchanger or a double-sided tooth radiator arranged in the upper cabinet and outside the box body;

at least one internal circulation fan is arranged in the box body.

Optionally, corresponding external circulation fans are arranged in the external circulation air channels of the air-air heat exchanger and the double-sided tooth radiator; or,

the air-air heat exchanger and the external circulation air duct of the double-sided tooth radiator share the external air duct of the radiator and a fan thereof.

Optionally, the method further comprises: the air inlet and outlet duct separation device is arranged in the box body and positioned between the two ends of the air-air heat exchanger.

Optionally, the hollow heat exchanger or the double-sided tooth radiator is arranged at the upper side, the lower side or the middle position of any side surface of the box body.

Optionally, the method further comprises: the direct current input power distribution assembly, the filter inductance assembly, the alternating current output power distribution assembly and the lower cabinet;

the direct current input power distribution assembly, the filter inductance assembly and the alternating current output power distribution assembly are arranged in the lower cabinet.

Optionally, the upper cabinet is detachably connected with the lower cabinet.

As can be seen from the above technical solution, the present utility model provides an inverter unit, which includes at least one module, the module includes a plurality of IGBT modules, and the IGBT modules are two-level IGBT modules; each IGBT module is arranged on the radiator in a straight shape, an external air channel of the radiator forms a preset angle with the arrangement direction of each IGBT module, and radiates heat to each IGBT module at the same time; through the in-line arrangement of the IGBT modules and the air duct direction design, heat accumulation on the mounting surface of the IGBT modules can be improved, the heat dissipation efficiency of the power device is improved, and the power density of the whole machine is improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an inverter unit according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a module of an inverter unit according to an embodiment of the present utility model;

fig. 3 is another schematic structural diagram of a module of an inverter unit according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of another module of an inverter unit according to an embodiment of the present utility model;

fig. 5 is another schematic structural diagram of a module of an inverter unit according to an embodiment of the present utility model;

fig. 6 is another schematic structural diagram of a module of an inverter unit according to an embodiment of the present utility model;

fig. 7 is a schematic diagram of another structure of a module of an inverter unit according to an embodiment of the present utility model;

fig. 8 is a schematic connection diagram of a multimode group of an inverter unit according to an embodiment of the present utility model;

fig. 9 is another connection schematic diagram of a multimode group of an inverter unit according to an embodiment of the present utility model;

fig. 10 is a schematic diagram of a device in a box body in a cabinet body structure according to an embodiment of the present utility model;

FIG. 11 is a schematic view of an external shape of a cabinet structure according to an embodiment of the present utility model;

FIG. 12 is a schematic view of the various sides of the cabinet structure of FIG. 11;

FIG. 13 is a schematic view of another external shape of a cabinet structure according to an embodiment of the present utility model;

FIG. 14 is a schematic view of the various sides of the cabinet structure of FIG. 13;

FIG. 15 is a schematic view of a specific structure of a module assembly in a cabinet structure according to an embodiment of the present utility model;

FIG. 16 is a schematic view of another specific structure of a module assembly in a cabinet structure according to an embodiment of the present utility model;

fig. 17 is a schematic diagram of a specific structure of a case in a case structure according to an embodiment of the present utility model;

fig. 18 is a schematic diagram of another specific structure of a case in the case structure according to the embodiment of the present utility model;

fig. 19 is a schematic view of another specific structure of a case in the case structure according to the embodiment of the present utility model;

fig. 20 is a schematic diagram of another specific structure of a case in the case structure according to the embodiment of the present utility model;

fig. 21 is a schematic diagram of another specific structure of a case in the case structure according to the embodiment of the present utility model;

fig. 22 is a schematic diagram of another specific structure of a case in the case structure according to the embodiment of the present utility model;

fig. 23 is a schematic circuit connection diagram of an inverter according to an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.

The utility model provides an inversion unit which is used for improving the heat dissipation efficiency of a power device and the power density of the whole machine.

Referring to fig. 1, the inverter unit (the front and side surfaces of which are shown in fig. 1) specifically includes: at least one module 102; wherein:

the module 102 includes a plurality (3 are shown in the figure as examples) of IGBT (Insulated Gate Bipolar Transistor ) modules, which are two-level IGBT modules, such as two-level IGBT modules packaged by 62mm white modules, or two-level IGBT modules packaged by econodeal, etc.; each IGBT module is electrically connected, and all the IGBT modules are arranged in a straight line on the heat sink 101.

The heat sink 101 may be a relieved tooth heat sink, but is not limited thereto; in addition, the external air channel of the radiator 101 forms a preset angle with the arrangement direction of each IGBT module, and in practical application, the preset angle may be 90 °, that is, the external air channel of the radiator 101 is perpendicular to the arrangement direction of each IGBT module; for example, when each IGBT module is arranged in a straight line as shown in fig. 1, the external air channel of the heat sink 101 may be in a vertical direction as shown in fig. 1 or in a horizontal direction (not shown), which is within the scope of the present utility model. In practical application, the preset angle can be other angles as long as each IGBT module can be simultaneously cooled, depending on the specific application environment.

According to the inversion unit provided by the embodiment, through the linear arrangement of the IGBT modules and the air duct direction design, heat accumulation on the mounting surface of the IGBT modules can be improved, the heat dissipation efficiency of the power device is improved, and the power density of the whole machine is improved.

Based on the above embodiment, the module 102 may be: multilevel topologies such as a three-level NPC (Neutral Point Clamped ) or ANPC (Active Neutral Point Clamped, active neutral point clamped) topology, or a five-level topology, etc. Moreover, the connection relationship of each IGBT module in the module 102 may be as shown in fig. 2 to 7, where the specific shape of the IGBT module and the labeling of the input end and the output end are shown on the left side in each figure.

Referring to fig. 2 and 3, each IGBT module in the module 102 is: a first IGBT module (module 1 shown in the figure), a second IGBT module (module 2 shown in the figure), and a third IGBT module (module 3 shown in the figure); the two input ends of the first IGBT module are respectively connected with the positive electrode (shown in the figure) and the midpoint N of the direct-current capacitor assembly; two input ends of the second IGBT module 112 are respectively connected to the midpoint N and the negative electrode (as shown in the figure) of the dc capacitor assembly; one input end of the third IGBT module is connected with the output end of the first IGBT module through a copper bar AC+, the other input end of the third IGBT module is connected with the output end of the second IGBT module through a copper bar AC-, and the output end (shown as an AC OUT) of the third IGBT module is connected with a filter inductor. The connecting structure can meet the three-level requirement of the system, and can improve the efficiency, quality and the like of the system.

It is worth to say that, aiming at the existing three-level NPC or ANPC topological structure, the third IGBT module is often used as a high-frequency switching tube, the generated loss is large, and the improvement of the whole power of the inverter is not facilitated; therefore, more preferably, the number of third IGBT modules in the module 102 may be set to be greater than 1 (illustrated as 2 in fig. 4 to 7).

Two third IGBT modules (such as module 3 and module 4 shown in fig. 4 to 7) are provided in each module 102, so that the loss of the corresponding module is greatly reduced, and the overall power of the inverter can be further improved.

In practical applications, the number of each IGBT module may be set according to a specific overall layout and power level, which is only a few optional examples, but not limited thereto.

In addition, for the module 102 implemented by three modules, the third IGBT module serving as an AC output interface function may be disposed on either side of the module 102 (as shown in fig. 2) or in the middle of the module 102 (as shown in fig. 3), but the output interface, ac+ copper bar, and AC-copper bar of the capacitor pool bus in the dc capacitor assembly may be different from each other, and may be specifically selected flexibly according to the overall layout, which is not limited herein.

For the four-module implementation module 102, two third IGBT modules as ac output interface functions, namely, the module 1 and the module 4 shown in fig. 4 to 7, may be located as follows: respectively at two side positions of the module combination (see fig. 4), at an intermediate position of the module 102 combination (see fig. 5), at any side position of the module 102 combination (see fig. 6), crosswise between the module combinations (see fig. 7), etc. Only the output interface, the AC+copper bar and the AC-copper bar of the bus of the capacitor pool are different in design, and the design can be flexibly selected according to the layout of the whole capacitor pool without limitation.

In addition, when the number of the modules 102 is greater than 1, each module 102 may be used as a phase conversion circuit of the inverter; alternatively, the ac sides of the modules 102 may be connected in parallel, thereby increasing the power level of the system.

Fig. 8 shows a schematic diagram of a module layout of the module 102 and bus connection of the dc capacitor assembly 30 implemented by using three modules, in which 9 IGBT modules are used, and each 3 IGBT modules form one module 102 to output three-phase power L1, L2 and L3, respectively. Three types of buses are used for integrating the direct-current supporting capacitor pool, one capacitor pool bus is directly connected with the IGBT module, and the other two types of buses are respectively: ac+ circulation bus (i.e. copper bar ac+) connecting module 1 and module 3, and AC-circulation bus (i.e. copper bar AC-) connecting module 2 and module 3.

Fig. 9 shows a schematic diagram of a module layout of a module 102 and bus connection of a dc capacitor assembly 30 implemented by four modules, in which 12 IGBT modules are combined into one module 102, and three-phase power L1, L2 and L3 are output respectively. The three buses are used for integrating the direct-current supporting capacitor pool, one capacitor pool bus is directly connected with the IGBT module, and the other two buses are an AC+ circulation bus for connecting the module 2 with the module 1 and the module 4 and an AC-circulation bus for connecting the module 3 with the module 1 and the module 4.

The structures shown in fig. 8 and 9 may be three-phase conversion circuits, i.e., L1, L2, and L3 in the figures are each one phase; alternatively, the circuit may be a single-phase conversion circuit, which is equivalent to three parallel connection of single-phase modules, namely, L1, L2 and L3 in the figure are connected in parallel; in practical application, the number of the modules can be set to be two parallel connections, four parallel connections and other arbitrary numbers of parallel connections.

It should be noted that, in order to improve the power level of the inverter, whether multiple modules in the module 102 are connected in parallel or multiple modules are connected in parallel, if a circuit adopts a scheme of connecting multiple IGBTs in parallel, heat of the radiator 101 provided with the IGBT module is accumulated, so that heat dissipation efficiency is affected, and power of the whole machine is limited; even if there is no parallel three-phase conversion circuit, if the IGBT modules in each module 102 are arranged in a delta-shaped configuration, heat accumulation caused by heat dissipation of two layers of IGBT modules is also formed. The embodiment arranges all IGBT modules on the radiator 101 in a straight shape, and has the advantages of being compared with the traditional Chinese character 'pin' arrangement: heat accumulation cannot be formed in the direction perpendicular to the external air duct of the radiator 101, so that heat dissipation of the IGBT is improved, the switching frequency of the IGBT can be improved under the same heat dissipation condition, harmonic content of alternating current output of the module 102 can be reduced, capacity of a filter capacitor and inductance of the filter inductor can be reduced, and finally cost of the whole inverter can be reduced.

In this embodiment, the structural layout of the IGBT module is arranged in a line shape perpendicular to the main air duct direction in order, so as to avoid the layout of the multi-layer IGBT module in the main air duct direction, thereby improving the heat accumulation on the mounting surface of the IGBT in the main air duct direction due to the multi-layer IGBT module layout, affecting the heat dissipation of the IGBT at the next stage in the air duct direction, thereby solving the problem of larger heat flux density, improving the heat dissipation efficiency of the power device, and being beneficial to improving the power density of the whole machine. Moreover, the number of the IGBT modules arranged in a straight line is not limited herein, and may be set according to a specific overall layout and power size.

Another embodiment of the present utility model provides a cabinet structure, referring to fig. 10, comprising: module assembly 10, dc capacitor assembly 30, a box (such as the rim shown in fig. 10), and upper cabinet 701 shown in fig. 11-14; wherein:

the module assembly 10 specifically includes the components shown in fig. 1: the radiator 101 and the inversion unit arranged on the radiator 101 enable the cabinet structure to realize the function of an inverter; the inverter unit includes at least one module 102, and its specific structure and principle are as described in the above embodiments, and are not described in detail herein; the external air duct of the radiator 101 is the main air duct in the upper cabinet 701.

Through the in-line arrangement of each IGBT module in the inversion unit and the air duct direction design, heat accumulation on the mounting surface of the IGBT module can be improved, the heat dissipation efficiency of the power device is improved, and the power density of the whole machine is improved.

The module assembly 10 and the direct current capacitor assembly 30 are integrated in the box; also, inside the case, the dc capacitor assembly 30 may be disposed on an upper side of the module assembly 10 (as shown in fig. 10), specifically, on an upper side of each IGBT module.

In addition, the case is provided in the upper cabinet 701. In practice, the cabinet structure may further include a lower cabinet 702, preferably, referring to fig. 11 to 14, and the upper cabinet 701 is detachably mounted on the lower cabinet 702.

Fig. 12 shows the inverter cabinet structure of fig. 11, wherein the uppermost part shows the bottom surface of the cabinet, the lowermost part shows the top surface of the cabinet, and the middle parts thereof show the following parts in sequence from left to right: the left side, the front side, the right side and the back side of the cabinet body. Fig. 14 shows the top of the cabinet, the bottom of the cabinet is shown in the uppermost part, the top of the cabinet is shown in the lowermost part, and the middle of the cabinet is shown in sequence from left to right: the left side, the front side, the right side and the back side of the cabinet body. Fig. 10 is a view of the internal device as seen from the front or back.

It should be noted that, in the high-power inverter in the prior art, the internal inverter module unit is integrated in the whole frame (cabinet) in a part form, so that when the inverter module unit fails, a professional is required to perform complex disassembly and assembly operations to realize maintenance, and the maintenance difficulty is high and the maintenance time is long.

The module assembly 10 and the dc capacitor assembly 30 are integrated in the case in this embodiment; when the module assembly 10 fails, the operation can be completed in a short time only by replacing the upper cabinet 701, so that the module assembly is suitable for non-professional personnel, the maintenance difficulty is reduced, and the maintenance speed is improved.

In practical application, the cabinet structure can further comprise: a control assembly 20 integrated into the housing; the module assembly 10 is controlled by a control assembly 20 to perform a power conversion, such as a dc to ac inverter function. The control assembly 20 includes: realize the PCB board of control function, and other vulnerable devices.

In the prior art, other vulnerable devices such as an inversion power module, a PCB and the like are scattered in the whole machine, so that collective maintenance is not easy; the inverter provided in this embodiment also integrates the control assembly 20 in the case, and uses the control assembly as a structural basis together with the module assembly 10 and the dc capacitor assembly 30, and as an inverter module part of the inverter, and uses the inverter in cooperation with other assemblies, thereby forming the inverter. When the device in the structure foundation fails, the non-professional can complete the operation in a short time by just disassembling and replacing the structure foundation.

In practical application, in order to realize heat dissipation of internal devices of the inverter, the upper cabinet 701 may be provided with at least 1 air inlet and at least 1 air outlet, and the air inlet and the air outlet of the main air duct in the inverter may be set not to be on the same surface of the upper cabinet 701, so that heat dissipation is more reliable and effective, for example, the air inlet and the air outlet may be respectively located on the top surface and the side surface of the upper cabinet 701; referring to the external views of the inverter shown in fig. 11 to 14, the left, right and top of the upper cabinet 701 are provided with air inlet or outlet structures (such as each 703 shown in the figures), and specific arrangement areas of the air inlet or outlet structures are not limited, and are only an example, and can be specifically arranged according to the direction of an air duct in the inverter; as shown in fig. 12 and 14, the wind direction (as indicated by continuous arrows) may be left or right, and only left or right single-sided inlet or outlet structure may be reserved if the intake demand is sufficient. In practical application, each air inlet or air outlet structure can comprise a corresponding air inlet and outlet and an air inlet and outlet protection plate on the outer surface.

Further, the air port on the top surface of the cabinet body can be set to be of a special-shaped structure, as shown in fig. 13 and 14, so that the direction of top air inlet or air outlet (the air inlet is shown in the drawing as an example) can be changed, and the parallel operation layout design applied to different scenes in the later stage is facilitated.

As shown in fig. 10 to 14, the case in the whole upper cabinet 701 is a relatively independent whole, and if the case cover on the top surface of the upper cabinet 701 is closed, the protection level of the whole inverter module part can reach at least IP65. The cover of the module part of the upper cabinet 701 is opened, and the module assembly 10, the dc capacitor assembly 30, the control assembly 20, the internal fan, and the like are all placed in the box. During production and installation, after the box body is completely assembled, the upper cabinet 701 can be integrally installed on the upper surface of the lower cabinet 702, so that the assembly is very convenient; in the later maintenance, when the device in the box body fails, the non-professional only needs to replace the upper cabinet 701 locally or wholly, so that the operation can be completed in a short time, and the operation is very simple, convenient and efficient.

The inverter provided by the embodiment has high IP protection level, compact structure and convenient installation, and can improve the production efficiency; later-stage maintenance is convenient, and customer experience degree can be improved.

On the basis of the above embodiment, in order to further improve the heat dissipation of the IGBT in this embodiment, it is preferable to provide a heat sink (101 shown in fig. 1) with a thermosiphon phase change heat sink, and, referring to fig. 15 and 16, when it is placed in the whole machine, a condenser 112 is provided at the upper end of an evaporator (i.e., a cold plate) 111 and forms an angle X with the evaporator 111, so that an external air duct of the condenser 112, i.e., an external air duct of the heat sink, is perpendicular to the arrangement direction of the IGBT modules inside the condenser 112, for example, the direction of the entire external condensation air duct (i.e., an external air duct of the condenser 112) is made to be a vertical direction, and, since the external air duct of the condenser 112 is used as a main air duct in the upper cabinet 701, a fan of the external air duct of the condenser 112 (as shown in fig. 15 and 16) may be provided directly above (as shown in fig. 15) or directly below (as shown in fig. 16) the evaporator 111, or perpendicular to the condenser 112. In practical application, the direction of the external air duct of the condenser 112 may be a horizontal direction, and the fan position is adjusted accordingly at this time, so that the air duct is perpendicular to the arrangement direction of each IGBT module, which is not shown one by one.

In this embodiment, the included angle X between the evaporator 111 and the condenser 112 is not limited, but the optimal solution is that the included angle X is greater than or equal to 90 ° and less than or equal to 180 °; in practical applications, the application environment can be determined according to the specific application environment.

On the basis of the above embodiment, the cabinet structure further includes: an air-to-air heat exchanger (801 shown in fig. 17 and 19) or a double-sided tooth radiator (802 shown in fig. 18 and 20) provided inside the upper cabinet 701 outside the cabinet; furthermore, at least one internal circulation fan (i.e., the internal fan shown in fig. 10) is also provided in the tank.

As shown in fig. 17, in order to improve heat dissipation in the electronic cavity where the other heat generating devices except the IGBT are located, a parallel flow type air-to-air heat exchanger (hereinafter referred to as heat exchanger) is employed, the heat exchanger is integrally disposed outside the closed case of the upper cabinet, and the direction of the outer circulation duct thereof is along the direction of the main duct. Thus, the outer circulation air channel of the heat exchanger is shared with the outer air channel (namely the main air channel) of the phase-change radiator (namely the radiator 101 in fig. 1), so that a fan of the outer circulation air channel can be saved; alternatively, in practical application, a corresponding external circulation fan may be separately provided for the external circulation air duct, as shown by 90 in fig. 19, so as to enhance the wind power of the external circulation air duct. If the main air duct fan is located above the evaporator, the direction of the external circulation air duct of the heat exchanger will be opposite to that shown in fig. 17.

In addition, at least one internal circulation fan (such as the internal fans shown in fig. 10, 17 and 18) is arranged in the internal circulation air duct of the heat exchanger, for example, the air outlet of the fan faces one end of the radiating fin, and the hot air in the internal cavity passes through one end of the heat exchanger through the internal circulation fan, passes through the bottom channel of the shell and finally exits from the other end of the heat exchanger; the layout of the internal devices is reasonably arranged, so that heat can be dissipated for the heating devices such as the capacitor, the PCB and the like; in addition, on the basis of the illustration in fig. 17, at least one additional internal circulation fan is preferably arranged in other areas in the box body, so that the internal circulation air duct structure can pass through each device as much as possible as illustrated in the illustration.

In addition, the inverter may further include: the air inlet and outlet channel separation device is arranged in the box body and positioned between two ends of the heat exchanger, such as a baffle plate; that is, the two ends of the heat exchanger can be separated by a partition plate or other modes to prevent the occurrence of a cross air short circuit phenomenon between the air channels of the air inlet and the air outlet of the internal circulation.

As shown in fig. 18, the heat exchanger may be replaced with a double-sided toothed heat radiator 802, in which one side of the teeth is located outside the closed case of the upper cabinet, and is used as an outside tooth 811, the direction of which is along the direction of the main air duct. Thus, the outer circulation air channel of the double-sided tooth radiator is shared with the condenser air channel (namely the main air channel) of the phase-change radiator (namely the radiator 101 in fig. 1), so that a fan of the outer circulation air channel can be saved; alternatively, in practical application, a corresponding external circulation fan may be separately provided for the external circulation air duct, as shown by 90 in fig. 20, so as to enhance the wind power of the external circulation air duct. Similarly, if the main duct fan is located above the evaporator, the direction of the external circulation duct of the double-sided tooth radiator 802 will be opposite to that shown in fig. 18.

The inner teeth 812 of the double-sided tooth radiator only need at least one internal circulation fan to blow directly to the direction of the teeth, and then radiate heat for heating devices such as capacitors, PCBs and the like; furthermore, on the basis of the illustration in fig. 18, it is preferable to arrange at least one additional internal circulation fan in other areas in the case, so as to ensure that the internal circulation duct structure can pass through each device as much as possible as illustrated in the illustration.

Furthermore, the heat exchanger or the double-sided toothed radiator may be disposed at an upper side, a lower side or a middle position of the case, depending on a specific application environment thereof. In practical application, the two side middle positions are taken as examples in fig. 17 to 20, and the side middle positions can be placed on the upper side (as shown in fig. 21) or the lower side (as shown in fig. 22) of the box body, so long as the external circulation air channel is along the main air channel direction, and the internal circulation air channel is similar to the above description, and no redundant description is provided. The modules shown in fig. 21 and 22 refer to the respective IGBT modules described in the above embodiments.

According to the embodiment, the layout of devices in the box body is reasonably arranged, so that the internal circulation air duct structure can be planned, and the overall heat dissipation performance is improved more efficiently.

It is worth to be noted that, in the high-power inverter in the prior art, in order to meet the protection level of the whole machine shell IP65, the electronic cavity inside the high-power inverter dissipates heat, that is, the heat dissipation of the cavity where other vulnerable devices such as a PCB board and the like are located is mostly implemented by adopting a heat exchanger radiator, and the external circulation air duct of the heat exchanger needs to be driven by an independent fan, so that the utilization rate of the air duct is low.

In this embodiment, the air-air heat exchanger and the external circulation air duct of the double-sided tooth radiator may be arranged, and the main air duct of the upper cabinet and the fan thereof (i.e. the main air duct fan shown in the figure) are shared, so that the fan of the external circulation air duct of the heat exchanger used for dissipating heat in the electronic cavity inside the traditional inverter is omitted, and the cost is saved.

Of course, as shown in fig. 19 and 20, it is also within the scope of the present utility model to separately provide the corresponding external circulation fan 90, and the external circulation fan 90 is preferably provided just above the outside portion of the hollow heat exchanger 801 or the double-sided tooth heat sink 802, and in practical application, may be provided at other positions, as long as it is along the direction of the main air duct, all of which are within the scope of the present utility model.

On the basis of the above embodiment, preferably, the cabinet structure further includes: the dc input power distribution assembly 40, the filter inductance assembly 50 (including the filter inductance), the ac output power distribution assembly 60 shown in fig. 23, and the lower cabinet 702 shown in fig. 11 to 14; the dc input power distribution assembly 40, the filter inductance assembly 50, and the ac output power distribution assembly 60 are disposed in the lower cabinet 702.

That is, the cabinet structure includes an upper cabinet 701 and a lower cabinet 702 shown in fig. 11 to 14, and the internal components thereof include those shown in fig. 23: module assembly 10, control assembly 20, dc capacitor assembly 30, dc input power distribution assembly 40, filter inductor assembly 50, and ac output power distribution assembly 60. Wherein:

the direct current input power distribution assembly 40, the direct current capacitor assembly 30, the module assembly 10, the filter inductance assembly 50 and the alternating current output power distribution assembly 60 are electrically connected in sequence; the other side of the DC input power distribution assembly 40 is connected with a DC side interface of the inverter, and the other side of the AC output power distribution assembly 60 is connected with an AC side interface of the inverter; the specific structure and function of each component can be referred to in the prior art, and will not be described herein.

The case body integrated with the module assembly 10, the control assembly 20, and the dc capacitor assembly 30 is provided in the upper cabinet 701; the dc input power distribution assembly 40, the filter inductance assembly 50, and the ac output power distribution assembly 60 are disposed in the lower cabinet 702.

Through the arrangement of the cabinet body structure, the maintenance difficulty is reduced, and the maintenance speed is improved; and moreover, the heat accumulation on the mounting surface of the IGBT module can be improved, the heat dissipation efficiency of the power device is improved, and the power density of the whole machine is improved.

The same and similar parts of the embodiments in this specification are all mutually referred to, and each embodiment focuses on the differences from the other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present utility model without undue burden.

Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present utility model.

The features described in the various embodiments of the present disclosure may be interchanged or combined with one another in the description of the disclosed embodiments to enable those skilled in the art to make or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (19)

1. An inverter unit, comprising: at least one module;

the module comprises a plurality of IGBT modules;

the IGBT module is a two-level IGBT module;

each IGBT module is arranged on the radiator in a straight shape;

and the external air channel of the radiator forms a preset angle with the arrangement direction of each IGBT module, and radiates heat to each IGBT module at the same time.

2. The inverter unit of claim 1, wherein the modules are multi-level topologies.

3. The inverter unit of claim 2, wherein the modules are: neutral point clamped NPC topology, or active neutral point clamped ANPC topology;

each IGBT module in the module is respectively: the first IGBT module, the second IGBT module and the third IGBT module;

two input ends of the first IGBT module are respectively connected with the positive electrode and the middle point of the direct current capacitor assembly;

two input ends of the second IGBT module are respectively connected with the negative electrode and the middle point of the direct-current capacitor assembly;

and two input ends of the third IGBT module are respectively connected with the output end of the first IGBT module and the output end of the second IGBT module, and the output end of the third IGBT module is connected with the alternating current filter module.

4. The inverter unit of claim 3, wherein the number of the third IGBT modules in the module is greater than 1.

5. The inverter unit of any one of claims 1-4, wherein the preset angle is 90 °.

6. A cabinet structure comprising: the device comprises a module assembly, a direct current capacitor assembly, a box body and an upper cabinet; wherein,,

the module assembly and the direct current capacitor assembly are integrated in the box body; the direct-current capacitor assembly is arranged on the upper side of the module assembly;

the box body is arranged in the upper cabinet;

the module assembly includes: a radiator and the inverter unit according to any one of claims 1 to 5 provided on the radiator.

7. The cabinet structure according to claim 6, wherein the heat sink is a thermosiphon phase change heat sink;

in the thermosiphon phase-change radiator, a condenser is positioned at the upper end of an evaporator, and an included angle exists between the condenser and the evaporator;

the external air channel of the condenser is the external air channel of the radiator.

8. The cabinet structure according to claim 7, wherein the external air duct of the condenser is oriented in a vertical direction or a horizontal direction; and/or the number of the groups of groups,

the fan of the external air duct of the condenser is arranged under or over the evaporator or is vertical to the condenser.

9. The cabinet structure according to claim 7, wherein the included angle is 90 ° or more and 180 ° or less.

10. The cabinet structure according to claim 6, wherein the heat sink is a relieved tooth heat sink.

11. The cabinet structure according to claim 6, further comprising: and the control component is integrated in the box body.

12. The cabinet structure according to claim 6, wherein an air inlet and an air outlet are provided in the upper cabinet, and the number of the air inlet and the number of the air outlet are equal to or greater than 1, and the air inlet and the air outlet are respectively located on the top surface and the side surface of the upper cabinet.

13. The cabinet structure according to claim 12, wherein the tuyere provided at the top surface of the upper cabinet has a special-shaped structure.

14. A cabinet structure according to any one of claims 6 to 13, further comprising: an air-air heat exchanger or a double-sided tooth radiator arranged in the upper cabinet and outside the box body;

at least one internal circulation fan is arranged in the box body.

15. The cabinet structure according to claim 14, wherein the air-to-air heat exchanger and the double-sided tooth radiator are provided with corresponding external circulation fans in the external circulation air duct; or,

the air-air heat exchanger and the external circulation air duct of the double-sided tooth radiator share the external air duct of the radiator and a fan thereof.

16. The cabinet structure according to claim 14, further comprising: the air inlet and outlet duct separation device is arranged in the box body and positioned between the two ends of the air-air heat exchanger.

17. The cabinet structure according to claim 14, wherein the hollow heat exchanger or the double-sided tooth heat sink is disposed at an upper side, a lower side, or a middle position of either side of the case.

18. A cabinet structure according to any one of claims 6 to 13, further comprising: the direct current input power distribution assembly, the filter inductance assembly, the alternating current output power distribution assembly and the lower cabinet;

the direct current input power distribution assembly, the filter inductance assembly and the alternating current output power distribution assembly are arranged in the lower cabinet.

19. The cabinet structure according to claim 18, wherein the upper cabinet is detachably connected to the lower cabinet.