CN215897597U - Three-level air-cooled power module - Google Patents

Abstract

The utility model discloses a three-level air-cooled power module which comprises a shell assembly, a radiator, an IGBT module, a module outer pipe adapter plate, a module inner pipe adapter plate, a module driving plate assembly, an absorption capacitor, a heating resistor and a temperature control switch, wherein the inner pipe and the outer pipe are connected with a row assembly, a direct current row assembly and an alternating current row; the radiator base plate surface is provided with a module outer pipe mounting area and a module inner pipe mounting area which is arranged up and down side by side with the module outer pipe mounting area; the utility model fully considers the modular design and has the advantages of simple processing, simple installation, easy maintenance, reasonable layout, reliable performance, strong environmental applicability and the like.

Description

Three-level air-cooled power module

Technical Field

The utility model belongs to the field of wind power generation, relates to a power module, and particularly relates to a three-level air-cooled power module.

Background

Compared with a two-level converter, the three-level converter has the advantages of large output capacity, high voltage, small current harmonic content, high efficiency and the like, so that the three-level converter is more and more applied to the field of wind power generation. With the increasing of the power number of the three-level air-cooled converter in the market, the volume of the three-level air-cooled module is also increased continuously, but the overall size of the converter is difficult to change due to the size limitation of a fan tower cylinder and a tower cylinder door frame, especially in the depth direction; in a linear air duct (air inlet at the front side and air outlet at the rear side) of a traditional three-level air cooling module, the rear side of the module needs to be increased with draught of a fan, and a power module is difficult or impossible to install in a converter due to the limited depth size of the converter; for example, chinese patent CN201921637226.7 discloses a heat dissipation structure of a T-type three-level converter, which includes: the heat dissipation device comprises a T-shaped three-level converter, a base plate, a ventilation pipeline, a plurality of heat dissipation fins and an air inlet, wherein the base plate is attached to the bottom of a heat dissipation element in the T-shaped three-level converter and used for absorbing hot air flow dissipated by the heat dissipation element; obviously, because the hot air flow of the heat dissipation element in the T-shaped three-level converter is dissipated by the plurality of heat dissipation fins in the ventilation pipeline, the hot air flow of the heat dissipation element can be dissipated by the plurality of heat dissipation fins in the ventilation pipeline in a centralized manner, and therefore the heat dissipation efficiency of the heat dissipation structure can be obviously improved;

to solve the problem, it is necessary to develop a three-level air-cooled power module that can solve the problem that the power module is difficult or impossible to install into the converter due to the limited depth dimension of the converter.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide a three-level air-cooled power module which is a modularized device with rated capacity, a plurality of three-level air-cooled power modules can be selected according to the total capacity of a system, and a bus capacitor pool is configured to form an important core component of a three-level converter.

The three-level air-cooled power module adopts the L-shaped air channel, so that the problem that the power module is difficult to or cannot be installed into the converter due to the limited depth size of the converter can be solved; meanwhile, modular design is fully considered, and the utility model has the advantages of simple processing, simple installation, easy maintenance, reasonable layout, reliable performance, strong environmental applicability and the like.

The technical scheme adopted by the utility model is as follows: a three-level air-cooled power module comprises a shell assembly, a radiator, an Insulated Gate Bipolar Transistor (IGBT) module, an outer module pipe adapter plate, an inner module pipe adapter plate, a module driving plate assembly, an absorption capacitor, a heating resistor, a temperature control switch, an inner and outer pipe connecting bar assembly, a direct current bar assembly and an alternating current bar; the shell assembly is of an inwards concave structure, the radiator is embedded in the inwards concave structure of the shell assembly, and a module outer pipe mounting area (21) and a module inner pipe mounting area (22) which is arranged in parallel with the module outer pipe mounting area (21) from top to bottom are arranged on the substrate surface of the radiator; a IGBT modules are uniformly arranged in the module outer pipe mounting area, and B IGBT modules are uniformly arranged in the module inner pipe mounting area; the number of the A is 2 times that of the B, and the IGBT modules on the module outer pipe mounting area and the IGBT modules on the module inner pipe mounting area form (A + B)/3T-shaped arrangement; each T-shaped layout can form an independent loop, and compared with the commonly used straight-line-shaped arrangement, the loss is less and the performance is more stable;

preferably, the radiator base plate surface is provided with a module outer pipe mounting area and a module inner pipe mounting area which is arranged up and down side by side with the module outer pipe mounting area.

Preferably, the IGBT module on the module outer tube mounting area and the IGBT module on the module inner tube mounting area are connected with the inner and outer tube connecting bar assembly through screws; the module driving plate assembly is installed on the shell assembly through screws and is connected to the upper layer of the row assembly through the inner pipe and the outer pipe, and the module driving plate assembly, the module outer pipe adapter plate and the module inner pipe adapter plate are installed together in a centralized mode and are located in the middle of the module outer pipe adapter plate and the module inner pipe adapter plate; the reasonable layout is that the driving cables from the module driving plate assembly to the module outer tube adaptive plate and the module inner tube adaptive plate are shortened, so that the driving control is facilitated, and the wiring is also facilitated.

Preferably, the direct current bank assembly is fixed on the upper part of the shell assembly through a screw, the connecting end of the direct current bank assembly is connected with the direct current end interface of the IGBT module on the module outer tube mounting area through a screw, and an absorption capacitor is mounted at the direct current end interface of the IGBT module on the module outer tube mounting area; the IGBT module protection circuit is used for absorbing voltage spikes caused by stray inductance, plays a role in protecting the IGBT module, and enables the performance of the IGBT module to be more reliable.

Preferably, the heating resistors are installed at the left side and the right side of the lower portion of the radiator through screws, the temperature control switches installed on the radiator can read the temperature on the substrate surface of the radiator in real time, and the resistors are cut off or opened through an external control circuit, so that the heating resistor can be rapidly heated when the heating resistor is started in a low-temperature humid environment, condensation is avoided, and the overall reliability and the environmental applicability of the module are improved.

Preferably, the alternating current bar is connected with an alternating current end of the IGBT module installed in the module inner tube installation area through a screw, and the alternating current bar is connected with the radiator through an insulating column and a screw; when the converter operates or transports vibration, impact load generated on the alternating current row can be concentrated on the insulating column, damage to the IGBT module due to the fact that the alternating current end interface bears the impact load can be effectively avoided, and reliability of the module is improved.

Preferably, a direct current row assembly is arranged on the substrate surface of the radiator and above the module outer tube mounting area, a positive electrode row, a neutral layer row and a negative electrode row in the direct current row assembly are mutually overlapped, and a layer of insulating film is arranged between every two rows of the direct current row assembly; 2 press-riveting screws are arranged on the positive electrode row and the neutral layer row, and the positive electrode row and the neutral layer row are connected with the SMC insulating bottom plate through nuts; 2 copper sleeves are arranged on the negative electrode row through a rising riveting process, and the negative electrode row is connected with the SMC insulating bottom plate through a screw; when the converter vibrates during operation or transportation, impact loads transmitted on the positive electrode row, the neutral layer row and the negative electrode row can be concentrated on the SMC insulating bottom plate, so that damage to a direct-current end interface of the GBT module due to bearing of the impact loads can be effectively avoided; the positive electrode row, the neutral layer row and the negative electrode row form a laminated structure, stray inductance can be reduced, and reliability of the IGBT module is improved.

Preferably, the upper and lower banks in the inner and outer tube bank assembly are stacked on each other with an insulating film interposed therebetween.

Preferably, a driving plate is mounted on a connecting plate in the module driving plate assembly through screws, and an insulating film is arranged between the driving plate and the connecting plate.

When in use, the utility model is arranged in a current transformer provided with a bus capacitor cell; when the air conditioner runs in a converter, air is fed from an air inlet on the front side of a module, and enters a fan after being discharged from the bottom of the module after passing through a radiator, and finally is discharged out of the converter; an L-shaped air channel is formed in the module, and an air draft centrifugal fan in the corresponding converter can be arranged at the lower side of the module and is not required to be arranged at the rear side of the module, so that the size of the converter in the depth direction is reduced; the included angle between the air deflector on the shell assembly and the air inlet direction is 35 degrees, the air deflector is arranged to change the wind direction, so that wind can more easily and uniformly enter the radiator, and the purpose of uniform heat dissipation is achieved.

According to the utility model, the shell assembly can be designed by mirror image and then a three-level power module forming mirror image can be installed, so that a back-to-back module installation structure is formed; the three-level air-cooled power module is a modularized device with rated capacity, and a plurality of three-level air-cooled power modules can be selected according to the total capacity of a system.

The utility model adopts a cold-processing aluminum-zinc-coated plate as a material of a shell component, completely abandons a welding processing mode, and is divided into the following units according to the trend of a main loop and the assembly requirement of a device according to functions: the shell assembly, the module driving plate assembly, the inner pipe and outer pipe connecting row assembly and the direct current row assembly can be assembled after being assembled respectively, and the direct current row assembly has the advantages of being simple in installation and easy to maintain.

After adopting the structure, the utility model has the beneficial effects that:

(1) according to the utility model, the cold-processed aluminum-clad zinc plate is used as the material of the shell component, a welding processing mode is completely abandoned, and the machinability is high;

(2) utility model moves towards and device assembly demand according to the major loop, divide into following several units according to the function: the shell assembly, the module driving plate assembly, the inner pipe and outer pipe connecting row assembly and the direct current row assembly can be assembled after being assembled respectively, and the direct current row assembly has the advantages of being simple in installation and easy to maintain.

(3) According to the utility model, the L-shaped air channel is adopted, the air draft centrifugal fan in the corresponding converter can be arranged at the lower side of the module, and is not required to be arranged at the rear side of the module, so that the size of the converter in the depth direction is reduced, and the problem that the converter cannot be or is difficult to install in the depth direction is solved.

(4) The air duct is provided with the air guide plate, so that air can more easily and uniformly enter the radiator, and the module can dissipate heat more uniformly.

(5) The direct-current bar assembly and the alternating-current bar are respectively connected with the SMC insulating bottom plate and the insulating column, so that the IGBT module can be effectively prevented from being damaged due to impact load bearing, and the reliability of the module is improved.

(6) The utility model comprises a heating resistor and a temperature control switch, so that the utility model can be quickly heated when the machine is started in a low-temperature humid environment, condensation is avoided, and the integral reliability and environmental applicability of the module are improved;

(7) the utility model has strong universality, and can install the three-level power module forming the mirror image after designing the shell assembly by the mirror image to form a back-to-back module installation structure.

Drawings

FIG. 1 is a front view of a three-level air-cooled power module of the present invention;

FIG. 2 is a partially exploded view of a three-level air-cooled power module of the present invention;

FIG. 3 is an isometric view of the housing assembly of the present invention;

FIG. 4 is an isometric view of the heat sink of the present invention;

FIG. 5 is an isometric view of a DC bank assembly of the present invention 1;

FIG. 6 is an isometric view of a DC bank assembly of the present invention;

FIG. 7 is an isometric view of an inner and outer tube coupling bank assembly in accordance with the present invention;

FIG. 8 is an isometric view of a modular drive plate assembly according to the present invention;

FIG. 9 is a front view of an embodiment of the present invention;

FIG. 10 is a schematic view of an air duct of a three-level air-cooled power module according to the present invention;

FIG. 11 is an installation diagram of an embodiment of the present invention.

Description of reference numerals: 1. the module comprises a shell assembly, 2, a radiator, 3, an IGBT module, 4, a module outer pipe adapter plate, 5, a module inner pipe adapter plate, 6, a module driving plate assembly, 7, an absorption capacitor, 8, a heating resistor, 9, a temperature control switch, 10, an inner pipe and outer pipe connecting row assembly, 11, a direct current row assembly, 12, an alternating current row, 13 air deflectors, 14 air inlets, 15 air outlets, 16 bus capacitor pools, 21, a module outer pipe mounting area, 22, a module inner pipe mounting area, 111, an anode row, 112 neutral layer rows, 113, a cathode row, 114, an SMC insulating bottom plate, 101, an upper connecting row, 102, a lower connecting row, 61, a driving plate, 62 and a connecting plate.

Detailed Description

The present invention will be further described with reference to FIGS. 1-11 and the detailed description thereof; the following examples will assist those skilled in the art in further understanding the utility model, but are not intended to limit the utility model in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the utility model. All falling within the scope of the present invention.

Referring to fig. 1, 2, 3 and 4, the present invention provides a three-level air-cooled power module, which includes a housing assembly 1, a heat sink 2, an IGBT (Insulated Gate Bipolar Transistor) module 3, a module outer tube adapter plate 4, a module inner tube adapter plate 5, a module drive plate assembly 6, an absorption capacitor 7, a heating resistor 8, a temperature control switch 9, an inner and outer tube connection row assembly 10, a dc row assembly 11, and an ac row 12; the base plate surface of the radiator 2 is provided with a module outer pipe mounting area 21 and a module inner pipe mounting area 22 which is arranged up and down side by side with the module outer pipe mounting area 21.

6 IGBT modules 3 are uniformly arranged in the module outer tube mounting area 21, 3 IGBT modules 3 are uniformly arranged in the module inner tube mounting area 22, and in the overall view, 9 IGBTs form 3T-shaped arrangements, each T-shaped arrangement can form an independent loop, and compared with the commonly used linear arrangement, the linear arrangement has the advantages of less loss and more stable performance;

the module of the utility model has strong universality, and 2 choices of different powers can be provided to adapt to the converters of different powers by changing the number of the IGBT modules 3. For example, as shown in fig. 9, in some embodiments, 4 IGBT modules 3 are uniformly installed in the module outer tube installation region 21, 2 IGBT modules 3 are uniformly installed in the module inner tube installation region 22, and 6 IGBTs form a 2 "T" shaped arrangement as a whole.

The IGBT module 3 on the module outer tube mounting area 21 is provided with a module outer tube adapting plate 4; the IGBT module 3 on the module inner tube mounting area 22 is provided with a module inner tube adapter plate 5;

referring to fig. 2, the IGBT module 3 mounted in the module outer tube mounting region 21 and the module inner tube mounting region 22 is connected to the inner and outer tube coupling bar assembly 10 by screws; the modular drive plate assembly 6 is mounted on the housing assembly 1 by screws and connects the upper layers of the row assemblies 10 to the inner and outer tubes. The module driving plate assembly 6, the module outer tube adaptive plate 4 and the module inner tube adaptive plate 5 are installed together in a centralized mode and just right in the middle of the module driving plate assembly and the module outer tube adaptive plate 4 and the module inner tube adaptive plate 5, and the reasonable layout is that driving cables from the module driving plate assembly 6 to the module outer tube adaptive plate 4 and the module inner tube adaptive plate 5 are shortened, so that driving control is facilitated, and wiring is also facilitated.

Referring to fig. 1, the dc bar assembly 11 is fixed on the upper portion of the housing assembly 1 by screws, the connection end of the dc bar assembly is connected to the dc terminal interface of the IGBT module 3 in the module outer tube installation area 21 by screws, and the absorption capacitor 7 is installed at the dc terminal interface of the IGBT module 3, so as to absorb the voltage spike caused by stray inductance, thereby protecting the IGBT module 3 and making the performance of the IGBT module 3 more reliable.

Referring to fig. 1, heating resistors 8 are installed at left and right sides of the lower portion of a heat sink 2 by screws, and a temperature control switch 9 installed on the heat sink 2 can read the substrate temperature of the heat sink 2 in real time, and the resistors are turned off or on by an external control circuit. Therefore, the utility model can be ensured to be heated quickly when the machine is started in a low-temperature and humid environment, condensation is avoided, and the integral reliability and the environmental applicability of the module are improved;

referring to fig. 1, an ac row 12 is connected to an ac end of an IGBT module 3 mounted in a module inner tube mounting region 22 by a screw, and the ac row 12 is connected to a heat sink 2 by an insulating column and a screw; when the converter operates or vibrates in transportation, impact load generated on the alternating-current row 12 can be concentrated on the insulating column, damage to the IGBT module 3 due to the fact that the alternating-current end interface bears the impact load can be effectively avoided, and reliability of the module is improved.

Referring to fig. 5 and 6, the positive electrode row 111, the neutral layer row 112 and the negative electrode row 113 of the dc row assembly 11 are stacked on each other with an insulating film interposed therebetween; 2 rivet pressing screws are pressed on the positive electrode row 111 and the neutral layer row 112 and are connected with the SMC insulating bottom plate 114 through nuts; 2 copper sleeves are riveted on the negative electrode row 113 in an expanding manner and are connected with the SMC insulating bottom plate 114 through screws; when the converter vibrates in operation or transportation, impact loads transmitted on the positive electrode row 111, the neutral layer row 112 and the negative electrode row 113 can be concentrated on the SMC insulating bottom plate 114, and damage to a direct-current end interface of the GBT module 3 due to the impact loads can be effectively avoided; the positive electrode row 111, the neutral layer row 112, and the negative electrode row 113 form a stacked structure, which can reduce stray inductance and improve reliability of the IGBT module 3.

Referring to fig. 7, the inner and outer tube bank assembly 10 has an upper bank 101 and a lower bank 102 stacked on each other with an insulating film interposed therebetween;

referring to fig. 8, a driving plate 61 is mounted on a connecting plate 62 in the module driving plate assembly 6 through screws, and an insulating film is arranged between the driving plate 61 and the connecting plate 62;

referring to fig. 10 and 11, the air inlet 14 and the air outlet 15 are shown in position, and the position shown in the direction C is the module underside mounted centrifugal fan draft

In practical use, the utility model is installed in a converter provided with a bus capacitor cell 16; when the air conditioner runs in a converter, air is fed from an air inlet 14 at the front side of a module, enters a fan after passing through a radiator 2 and is discharged from the bottom of the module, and finally is discharged out of the converter; an L-shaped air duct is formed in the module, and the air draft centrifugal fan in the corresponding converter can be arranged on the lower side of the module (as shown in fig. 11) and is not required to be arranged on the rear side of the module, so that the size of the converter in the depth direction (as shown in the direction D in the figure) is reduced; the included angle between the air deflector 13 on the shell assembly 1 and the air inlet direction is 35 degrees, and the air deflector 13 is arranged to change the wind direction, so that the wind can more easily and uniformly enter the radiator, and the purpose of uniform heat dissipation is achieved.

According to the utility model, a three-level power module forming a mirror image can be installed after the shell assembly 1 is designed in a mirror image manner, so that a back-to-back module installation structure shown in fig. 11 is formed; the three-level air-cooled power module is a modularized device with rated capacity, and a plurality of three-level air-cooled power modules can be selected according to the total capacity of a system.

The utility model adopts a cold-processing aluminum-zinc-coated plate as a material of the shell component 1, completely abandons a welding processing mode, and is divided into the following units according to the trend of a main loop and the assembly requirement of devices according to functions: the shell assembly 1, the module driving plate assembly 6, the inner pipe and outer pipe connecting row assembly 10 and the direct current row assembly 11 can be assembled respectively and then assembled, and the direct current row assembly has the advantages of being simple in installation and easy to maintain.

The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (9)

1. A three-level air-cooled power module is characterized by comprising a shell assembly (1), a radiator (2) and an IGBT module (3);

the shell assembly (1) is of an inwards concave structure, the radiator (2) is embedded in the inwards concave structure of the shell assembly (1), and a module outer pipe mounting area (21) and a module inner pipe mounting area (22) which is arranged in parallel with the module outer pipe mounting area (21) up and down are arranged on the substrate surface of the radiator (2);

a IGBT modules (3) are uniformly arranged in the module outer pipe mounting area (21), and B IGBT modules (3) are uniformly arranged in the module inner pipe mounting area (22);

the number of the A is 2 times that of the B, and the IGBT modules (3) on the module outer tube mounting area (21) and the IGBT modules (3) on the module inner tube mounting area (22) form (A + B)/3T-shaped arrangement.

2. A three-level air-cooled power module according to claim 1, characterized in that an outer module tube adapter plate (4) is mounted on the IGBT module (3) on the outer module tube mounting area (21); and an IGBT module (3) on the module inner tube mounting area (22) is provided with a module inner tube adapter plate (5).

3. A three-level air-cooled power module according to claim 2, characterized in that the IGBT modules (3) on the module outer tube mounting area (21) and the IGBT modules (3) on the module inner tube mounting area (22) are connected to the inner and outer tube bank assembly (10) by screws; the module driving plate assembly (6) is installed on the shell assembly (1) through screws and on the upper layer of the inner and outer pipe connecting row assembly (10), and the module driving plate assembly (6), the module outer pipe adapter plate (4) and the module inner pipe adapter plate (5) are installed together in a concentrated mode and in the middle of the two.

4. The three-level air-cooled power module according to claim 1, characterized in that the dc bar assembly (11) is fixed on the upper part of the housing assembly (1) by screws, the connection end of the dc bar assembly (11) is connected with the dc end interface of the IGBT module (3) on the module outer tube mounting area (21) by screws, and the absorption capacitor (7) is installed at the dc end interface of the IGBT module (3) on the module outer tube mounting area (21).

5. The three-level air-cooled power module as claimed in claim 1, wherein the heating resistors (8) are mounted at the left and right sides of the lower part of the heat sink (2) by screws, and the temperature control switch (9) mounted on the heat sink (2) can read the temperature on the substrate surface of the heat sink (2) in real time.

6. A three-level air-cooled power module according to claim 1, characterized in that the ac row (12) is connected by means of screws to the ac end of the IGBT module (3) mounted in the module inner tube mounting area (22), and the ac row (12) is connected by means of insulating posts and screws to the heat sink (2).

7. The three-level air-cooled power module as claimed in claim 1, wherein a dc row assembly (11) is disposed on the substrate surface of the heat sink (2) and above the module outer tube mounting region (21), and the positive row (111), the neutral row (112) and the negative row (113) of the dc row assembly (11) are stacked together with an insulating film therebetween; 2 rivet pressing screws are arranged on the positive electrode row (111) and the neutral layer row (112), and the positive electrode row (111) and the neutral layer row (112) are connected with an SMC insulating bottom plate (114) through nuts; 2 copper sleeves are arranged on the negative electrode row (113) through an expanding riveting process, and the negative electrode row (113) is connected with an SMC insulating bottom plate (114) through a screw.

8. A three-level air-cooled power module according to claim 3, characterized in that the upper connection row (101) and the lower connection row (102) in the inner and outer tube connection row unit (10) are stacked on each other with an insulating film interposed therebetween.

9. A three-level air-cooled power module according to claim 3, characterized in that the drive plate (61) is mounted by screws on the connecting plate (62) in the module drive plate assembly (6), and an insulating film is provided between the drive plate (61) and the connecting plate (62).

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