WO2016201714A1

WO2016201714A1 - Method of assembling extendable inverter and mechanical assembly thereof

Info

Publication number: WO2016201714A1
Application number: PCT/CN2015/082290
Authority: WO
Inventors: 黄风太; 贝特朗·罗伯特·莫尔
Original assignee: 中山大洋电机股份有限公司
Priority date: 2015-06-18
Filing date: 2015-06-25
Publication date: 2016-12-22
Also published as: CN106329949A

Abstract

Disclosed are a method of assembling an extendable inverter and mechanical assembly thereof. The mechanical assembly of the extendable inverter comprises an inverter casing (1), a heat sink (2) provided in the inverter casing, M power modules (3) mounted on the heat sink, a drive circuit board (4) and a control circuit board (5) mounted in the inverter casing. The control circuit board drives the M power modules through the drive circuit board, wherein the number M of the power modules is variable, ranging from 3 to N, and N is an integer greater than 3. The number M of the power modules is determined by load requirements, and any combination of M high-voltage AC outputs corresponding to the M power modules can be utilized to adapt to various loads. The mechanical assembly of the extendable inverter has a simple structure, is compact, and the number of the power modules can be easily extended and combined as needed to satisfy the needs for different loads, thus being flexible, convenient, highly versatile, and having short development cycle and reduced development cost.

Description

Expandable inverter assembly method and mechanical assembly thereof

Technical field:

The invention relates to a method for assembling an expandable inverter and a mechanical assembly thereof, and belongs to the field of electric vehicles.

Background technique:

In the existing electric vehicles, due to the difference in the number of phases of the stator windings of the motor, the inverter used to control the operation of the motor needs to set different numbers of inverter modules according to the number of phases of the stator windings of the motor. For example, the 3-phase motor only needs to be in the inverter. There is one inverter module in the inverter, and the 6-phase motor needs to set two inverter modules in the inverter. The 9-phase motor needs to set three inverter modules in the inverter. Each inverter module includes the bottom part. The IGBT module and the driving circuit board and the control circuit board located at the top of the IGBT module, and the control circuit board controls the operation of the IGBT module through the driving circuit board.

In the inverter of the existing electric vehicle, a plurality of inverter modules are installed side by side or stacked on the front end of the inverter, and the capacitor module is installed at the rear end of the inverter, and cooling is provided on the bottom surface of the inverter box. Waterway, through the cooling water channel to heat the multiple inverter modules and capacitor modules, but this inverter has the following shortcomings:

1) Today's inverters are specifically designed for specific applications, ie each type of automotive motor has its own specially designed inverter. This specially designed inverter has no expandability and composability for different types of automotive motors, and has a narrow application range and poor versatility;

2) The structure of the inverter is scattered and bulky, which greatly occupies a very limited installation space inside the electric vehicle;

3) The heat dissipation effect is not ideal. It is difficult to dissipate the heat dissipation of multiple inverter modules and capacitor modules by the cooling water channel on the bottom surface of the inverter, and the area of the cooling water channel must be designed to be relatively large to cover multiple inverter modules. And the capacitor module, but after the cooling water flows from the large-area cooling water channel, the temperature of the cooling water near the water outlet is high, and the inverter module or the capacitor module near the water outlet cannot be effectively dissipated, resulting in various inverses. The temperature rise of the variable module and the capacitor module are inconsistent, which will inevitably affect the normal operation of the inverter.

Summary of the invention:

An object of the present invention is to provide an assembly method of an expandable inverter, which is convenient to expand and combine the number of power modules as needed to meet the needs of different loads, and is flexible and convenient, and has high versatility.

Another object of the present invention is to provide a mechanical assembly of an expandable inverter, which has a simple and compact structure, and is convenient to expand and combine the number of power modules according to requirements to meet the needs of different loads, and is flexible and convenient, and has high versatility. .

The object of the present invention is achieved by the following technical solutions:

An assembly method of an expandable inverter, the inverter comprising an inverter box, a heat sink disposed inside the inverter box, M power modules mounted on the heat sink, and being installed in the inverter The driving circuit board and the control circuit board inside the cabinet, the control circuit board drives the M power modules through the driving circuit board, and the method is to install M power modules on the radiator inside the same inverter box, the power module The quantity M is variable, ranging from 3 to N, N is an integer greater than 3, the number M of power modules is determined according to the load requirements, and each power module is electronically switched and placed by the upper half of the bridge. The single-phase half-bridge structure consisting of the electronic switch of the half bridge, the connection between the electronic switch of the upper half bridge and the electronic switch of the lower half bridge forms a high-voltage AC output terminal, and the corresponding M of the M power modules can be utilized. The high voltage AC outputs are freely combined to accommodate different loads.

The mechanical assembly of the expandable inverter includes an inverter box, a heat sink disposed inside the inverter box, M power modules mounted on the heat sink, and a driver installed in the inverter box The circuit board and the control circuit board, the control circuit board drives the M power modules through the driving circuit board, the number M of the power modules is variable, the range is in the range of 3 to N, and N is an integer greater than 3, The heat sink is provided with N mounting positions for installing power modules, and each power module is a single-phase half-bridge structure composed of an electronic switch of the upper half bridge and an electronic switch of the lower half bridge, and the electronic switch of the upper half bridge and The connection between the electronic switches of the lower half bridge forms a high voltage AC output terminal, and N high voltage AC ports are reserved on the inverter box, and one of the high voltage AC output ends of each power module is respectively The high voltage AC port is taken out.

The above water heater is provided with a cooling water channel and is provided with a water inlet and a water outlet connected to the cooling water channel. M power modules are installed on the bottom surface of the heat sink. A plurality of capacitor modules are mounted on the top surface of the heat sink, and all power modules and capacitor modules are uniformly radiated through the heat sink.

The power module and the capacitor module are electrically connected together through a laminated bus bar, and an external DC power source is input to each power module through the laminated bus bar.

The top opening and the bottom opening are respectively formed on the top and the bottom of the inverter box, the top cover is mounted on the top of the inverter box to seal the top opening, and the bottom cover is mounted on the bottom of the inverter box. Seal the bottom opening.

The top cover described above is wedge-shaped, the bottom cover is rectangular, the heat sink is disposed at an intermediate position inside the inverter box, and an upper cavity is formed between the top surface of the heat sink and the top cover, the capacitor The module is located inside the upper cavity and is mounted on the top surface of the heat sink. A lower cavity is formed between the bottom surface of the heat sink and the bottom cover. The power module is located inside the lower cavity and is mounted on the bottom surface of the heat sink.

Each of the high-voltage AC ports is mounted with one AC output terminal, and the high-voltage AC output terminals of each power module are electrically connected to one AC output terminal, and one power module and the AC output terminal pass through each. The AC copper bars are electrically connected together and the AC busbars pass through the middle of the current sensor mounted inside the inverter case.

The above surface is provided with a groove on the bottom surface of the heat sink and a cover plate for sealing the groove is mounted on the bottom surface of the heat sink. The cooling water channel is disposed in the groove, and M is equal to 3 or M is equal to 6 or M. Equal to 9, 3 or 6 or 9 power modules mounted side by side on the underside of the cover of the heat sink.

Each of the above three power modules is connected in parallel to form one three-phase full-bridge power module, and each three-phase full-bridge power module drives three coil windings of the motor respectively, above each three-phase full-bridge power module, and the heat sink A capacitor module is mounted on the top surface, and each three-phase full-bridge power module is electrically connected to one capacitor module.

The above-mentioned laminated busbar is arranged inside the inverter box, and the laminated busbar comprises two DC busbars which are insulated and arranged side by side, and the capacitor module and the three-phase full-bridge power module are electrically connected by the laminated busbar Connected together, external DC power is input to each three-phase full-bridge power module through the laminated busbar.

A door substrate is mounted on the bottom surface of each power module, and the control circuit board controls the driving circuit board. The driving circuit board drives one power module through one door substrate.

The driving circuit board is mounted on the bottom surface of the door substrate, the control circuit board is located below the driving circuit board, the driving circuit board and each of the door substrates, and between the control circuit board and the driving circuit board are passed through the board-to-board connector For electrical connection, a low voltage signal connector is mounted on one side of the inverter housing, and the low voltage signal connector is electrically connected to the control circuit board.

The electronic switch of the upper half bridge and the electronic switch of the lower half bridge are both IGBTs, and the emitter of the IGBT of the upper half bridge and the collector of the IGBT of the lower half bridge are connected and lead to form a high voltage AC output terminal, the upper half bridge The collector and gate of the IGBT lead, the gate of the lower half of the IGBT and the emitter lead, the gate of the IGBT of the upper half bridge and the gate of the IGBT of the lower half of the bridge are connected to the drive circuit board.

The electronic switch of the upper half bridge and the electronic switch of the lower half bridge are both MOSFETs, the source of the MOSFET of the upper half bridge and the drain of the MOSFET of the lower half bridge are connected and lead to form a high voltage AC output terminal, the upper half bridge The drain and gate of the MOSFET are pulled out, the gate and source of the lower half of the MOSFET are pulled out, the gate of the upper half of the MOSFET and the gate of the lower half of the MOSFET are connected to the driver board.

Compared with the prior art, the invention has the following effects:

1) The number M of power modules is variable, ranging from 3 to N, and N is an integer greater than 3. The number M of power modules is determined according to the load requirements, and the corresponding M of the M power modules can be utilized. The high-voltage AC output terminals are freely combined to adapt to different loads, flexible and convenient, and versatile, which can shorten the development cycle, reduce development costs, reduce product models and reduce management costs;

2) The structure is simple and compact, and the control circuit board drives a plurality of power modules through the driving circuit board, fully integrating and utilizing the resources of the inverter, and reducing the production cost;

3) A cooling water channel is arranged on the radiator and a water inlet and a water outlet connected with the cooling water channel are provided, and the M power module and the capacitor module can be uniformly radiated through the heat sink, and the heat dissipation effect is ideal, and the operation of the inverter is ensured. Reliability and stability.

BRIEF DESCRIPTION OF THE DRAWINGS:

1 is a perspective view of an inverter in the first embodiment;

Figure 2 is a first exploded view of the inverter of the first embodiment;

Figure 3 is a second exploded view of the inverter of the first embodiment;

4 is a third exploded view of the inverter in the first embodiment;

Figure 5 is a fourth exploded view of the inverter of the first embodiment;

Figure 6 is a partial exploded view of the inverter of the first embodiment;

Figure 7 is a plan view of the inverter of the first embodiment;

Figure 8 is a cross-sectional view taken along line A-A of Figure 7;

Figure 9 is a cross-sectional view taken along line B-B of Figure 7;

Figure 10 is a perspective view of the inverter case in the embodiment;

Figure 11 is a perspective view of the cover in the embodiment;

Figure 12 is a circuit diagram of a single power module in an embodiment;

13 is a circuit schematic diagram of an inverter in the first embodiment;

14 is a connection circuit diagram of a capacitor module and a three-phase full-bridge power module in the embodiment;

Figure 15 is a partial exploded view of the inverter of the second embodiment;

16 is a circuit schematic diagram of an inverter in Embodiment 2;

Figure 17 is a diagram showing another circuit configuration of the power module of the present invention.

detailed description:

The present invention will now be described in further detail by way of specific embodiments and the accompanying drawings.

Embodiment 1 As shown in FIG. 1 to FIG. 14 , this embodiment is a mechanical assembly of an expandable inverter, comprising an inverter box 1 and a radiator 2 disposed inside the inverter box 1 M power modules 3 mounted on the heat sink 2, a drive circuit board 4 mounted in the inverter case 1 and a control circuit board 5, and the control circuit board 5 drives M power modules 3 through the drive circuit board 4, The number M of power modules 3 is variable, ranging from 3 to N, N being an integer greater than 3, and the number M of power modules 3 is determined according to load requirements. In this embodiment, the number of power modules 3 is nine, and the load is: one 9-phase motor, or three independent 3-phase motors, or one 3-phase motor and one 6-phase motor. Or a three-phase 3-phase motor, or a 3-phase motor, or a 3-phase motor and 1 A dual 3-phase motor, or a 6-phase motor and a 3-phase inductor, or a dual 3-phase motor and a 3-phase inductor, or two 3-phase motors and a 3-phase inductor Device.

The drive circuit board 4 is provided with nine drive circuits, and the control circuit board 5 drives one power module 3 by one drive circuit. The power module is a single-phase half-bridge structure composed of an electronic switch of the upper half bridge and an electronic switch of the lower half bridge. In this embodiment, the electronic switch adopts an IGBT, but the specific form of the electronic switch should not be understood as the scope of protection of the present invention. limit. That is, in the present embodiment, each power module 3 is a single-phase half-bridge structure composed of an IGBT of an upper half bridge and an IGBT of a lower half bridge, and an emitter of an IGBT of an upper half bridge and a collector of an IGBT of a lower half bridge Connected and led out to form a high voltage AC output, the collector and gate of the IGBT of the upper half of the bridge, and the gate and emitter of the IGBT of the lower half of the bridge. The inverter housing 1 is provided with nine AC output terminals 61, and the high-voltage AC output terminals of each power module 3 are electrically connected to one AC output terminal 61, and each of the three AC output terminals 61 is composed of one. Three-phase AC output terminal. A cooling water channel 20 is opened in the radiator 2 and a water inlet 21 and a water outlet 22 communicating with the cooling water channel 20 are provided, and the power module 3 is uniformly radiated by the heat sink 2. The cooling water flowing from the cooling water passage 20 removes the heat generated by the power module 3 during operation and transmitted to the radiator 2, thereby achieving heat dissipation to the power module 3.

Each of the power modules 3 and the AC output terminals 61 are electrically connected together by an AC copper bus 611, and the AC copper bars 611 pass through the middle of the current sensor 612 mounted inside the inverter case 1. The current sensor 612 used in this embodiment is a three-phase current sensor, and each of the three power modules 3 is connected in parallel to form one three-phase full-bridge power module 30, and three AC copper bars 611 of each three-phase full-bridge power module 30. It passes through a three-phase current sensor and is connected to a three-phase AC output terminal mounted on the inverter case 1.

The heat sink 2 has a rectangular shape. The bottom surface of the heat sink 2 is provided with nine mounting positions 23, and one power module 3 is mounted on each mounting position 23, that is, power is installed on all the mounting positions 23. Module 3.

Each of the three power modules 3 is connected in parallel to form a three-phase full-bridge power module 30, and each three-phase full-bridge power module 30 drives three coil windings of the motor to operate on each of the three-phase full-bridge power modules 30. A capacitor module 7 is mounted on the top surface of the square and the heat sink 2, and each of the three-phase full-bridge power modules 30 is electrically connected to one capacitor module 7 respectively, and the power module 3 and the capacitor module 7 are passed through the heat sink 2. Unified heat dissipation. The cooling water flowing from the cooling water channel 20 will take away the heat generated by the power module 3 and the capacitor module 7 and transmitted to the heat sink 2, thereby achieving uniform heat dissipation of the power module 3 and the capacitor module 7, and the heat dissipation effect is ideal. And the structure is simple and compact. The capacitor module 7 is used to connect to the DC bus (parallel to both ends of the DC bus) to provide ripple current to the three-phase full-bridge power module 30.

A laminated busbar 8 is disposed inside the inverter casing 1, and the laminated busbar 8 comprises two DC busbars 81 insulated and arranged side by side, and the capacitor module 7 and the three phases are connected through the laminated busbar 8. The full bridge power modules 30 are electrically connected together, and an external DC power source is input to each of the three-phase full-bridge power modules 3 through the laminated bus bar 8. Specifically, in this embodiment, there are three three-phase full-bridge power modules 30, corresponding to a total of three capacitor modules 7, each of which is corresponding to and electrically connected to one three-phase full-bridge power module 30. . The laminated bus bars 8 are shared, and the three capacitor modules 7 are respectively electrically connected to one corresponding three-phase full-bridge power module 30 by the one laminated bus bar 8. The structure is simple and simple. The connection is convenient and reliable.

The AC output terminal 61 is disposed on the front end surface of the inverter casing 1, and a DC input terminal 62, a water inlet nozzle 63, and a water outlet nozzle 64 are further disposed on the front end surface of the inverter casing 1. The DC input terminal includes a positive DC input terminal and a negative DC input terminal, and the DC input terminal 62 is electrically connected to the laminated bus bar 8. The water inlet nozzle 63 is connected to the water inlet 21 of the cooling water channel 20, and the water outlet nozzle 64 is connected to the water outlet 22 of the cooling water channel 20. The various interfaces are uniformly located on the front end surface of the inverter housing for convenient connection and improvement. The operational efficiency of employees.

One door substrate 41 is mounted on the bottom surface of each power module 3, and the control circuit board 5 controls the drive circuit board 4, and the drive circuit board 4 drives one power module 3 through one door substrate 41. The driving circuit board 4 is mounted on the bottom surface of the door substrate 41, the control circuit board 5 is located below the driving circuit board 4, between the driving circuit board 4 and each of the door substrates 41, between the control circuit board 5 and the driving circuit board 4. The board-to-board connector 10 is electrically connected, and has a simple structure and convenient connection, and effectively reduces the connection harness inside the inverter.

A low voltage signal connector 65 is mounted on one side of the inverter case 1, and the low voltage signal connector 65 is electrically connected to the control circuit board 5. The structure is simple and compact, and the internal space inside the inverter case 1 is fully utilized. The motor temperature detection signal, the rotor position signal, and the 24V low voltage power supply are all input to the control circuit board 5 through the low voltage signal connector 65.

A groove 24 is formed on the bottom surface of the heat sink 2 and a cover plate 25 for sealing the groove 24 is mounted on the bottom surface of the heat sink 2, and the nine power modules 3 are mounted side by side on the bottom surface of the cover plate 25, A cooling water channel 20 is disposed inside the recess 24. A partition plate 251 is protruded from the cover plate 25, and the partition plate 251 extends into the groove 24, and nine parallel shunt passages 201 are formed between the partition plates 251, and each of the branch passages 201 is mounted with The position of one power module 3 on the bottom surface of the cover plate 25 corresponds. It has the characteristics of independent heat dissipation and uniform flow distribution of each power module, ensuring uniformity of heat dissipation and improving heat dissipation efficiency.

A needle bed 250 is disposed inside each of the branch passages 201, and the contact area between the cooling water and the radiator 2 is increased by the needle bed, so that the cooling water can take away more heat and improve the heat dissipation efficiency of the inverter.

A top opening 101 and a bottom opening 102 are respectively formed at the top and the bottom of the inverter case 1, and a top cover 91 having a wedge shape is mounted on the top of the inverter case 1 to seal the top opening 101, which can be changed by changing the top cover 91 shape to suit different applications and installation needs. That is, the specific shape of the top cover 91 should not be regarded as limiting the scope of the present invention, and the top cover 91 can be designed according to different applications and installation requirements. A bottom cover 92 having a rectangular shape is mounted on the bottom of the inverter casing 1 to seal the bottom opening 102. The structure is simple and the installation is convenient and quick.

The heat sink 2 is disposed at an intermediate position inside the inverter case 1, and an upper cavity 1001 is formed between the top surface of the heat sink 2 and the top cover 91. The capacitor module 7 is located inside the upper cavity 1001 and is mounted on On the top surface of the heat sink 2, a lower cavity 1002 is formed between the bottom surface of the heat sink 2 and the bottom cover 92. The power module 3 is located inside the lower cavity 1002 and mounted on the bottom surface of the heat sink 2.

Embodiment 2: As shown in FIG. 15 and FIG. 16 , the difference from the first embodiment is that the number of the power modules 3 is six, and the six power modules 3 are mounted side by side on the heat sink 2 in a “one” shape. On the bottom surface, the load is: one 6-phase motor, or two independent 3-phase motors, or one dual 3-phase The motor is either a 3-phase motor and a 3-phase inductor. Six driving circuits are further disposed on the driving circuit board 4. The control circuit board 4 drives one power module 3 through one driving circuit, and six AC output terminals 61 are further disposed on the inverter housing 1, each of which is provided. The high voltage AC outputs of the power modules 3 are electrically connected to one AC output terminal 61, respectively.

The heat sink 2 has a rectangular shape. The bottom surface of the heat sink 2 is provided with nine mounting positions 23, and one power module 31 is mounted on one mounting position 23, that is, a power module is mounted on a part of the mounting position 23. 3.

When the number of the power modules 3 is three, the structure of the inverter is similar to that of the second embodiment, and details are not described herein again.

The electronic switch used in the power module of FIG. 12 is an IGBT. These IGBTs can be replaced by MOSFETs (commonly known as MOS tubes). As shown in FIG. 17, the electronic switches of the upper half bridge and the electronic switches of the lower half bridge are MOSFETs. The source of the MOSFET of the upper half bridge is connected to the drain of the MOSFET of the lower half bridge and leads out (as a high voltage AC output), the drain and gate of the MOSFET of the upper half bridge, and the lower half of the bridge The gate and source of the MOSFET are pulled out of the pin.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and scope of the present invention are equivalent. The manner of replacement is included in the scope of protection of the present invention.

Claims

An assembly method of an expandable inverter, the inverter comprising an inverter box, a heat sink disposed inside the inverter box, M power modules mounted on the heat sink, and being installed in the inverter The driving circuit board and the control circuit board inside the box, the control circuit board drives the M power modules through the driving circuit board, wherein the method is: arranging and installing M power modules on the radiator inside the same inverter box The number M of power modules is variable, ranging from 3 to N, and N is an integer greater than 3. The number M of power modules is determined according to load requirements, and each power module is from the upper half of the bridge. The single-phase half-bridge structure consisting of the electronic switch and the electronic switch of the lower half bridge, the connection between the electronic switch of the upper half bridge and the electronic switch of the lower half bridge forms a high-voltage AC output terminal, and M power modules can be utilized The corresponding M high voltage AC outputs are freely combined to accommodate different loads.
The mechanical assembly of the expandable inverter includes an inverter case (1), a heat sink (2) disposed inside the inverter case (1), and M powers mounted on the heat sink (2) The module (3), the driving circuit board (4) installed in the inverter cabinet (1) and the control circuit board (5), and the control circuit board (5) drive the M power modules through the driving circuit board (4) ( 3), characterized in that the number M of power modules (3) is variable, ranging from 3 to N, N is an integer greater than 3, and the heat sink (2) is provided with N The installation position (23) is used to install the power module (3), and each power module (3) is a single-phase half-bridge structure composed of an electronic switch of the upper half bridge and an electronic switch of the lower half bridge, and the electronics of the upper half bridge The connection between the switch and the electronic switch of the lower half bridge forms a high voltage AC output terminal, and N high voltage AC ports are reserved on the inverter housing (1), and the high voltage AC of each power module (3) The output terminals are respectively taken out from one of the high voltage AC ports.
A mechanical assembly for an expandable inverter according to claim 2, wherein a cooling water passage (20) is opened in the radiator (2) and a water inlet (21) communicating with the cooling water passage (20) is provided (21) And the water outlet (22), M power modules (3) are installed on the bottom surface of the heat sink (2), and a plurality of capacitor modules (7) are mounted on the top surface of the heat sink (2) through the heat sink (2) ) Unified cooling of all power modules (3) and capacitor modules (7).
A mechanical assembly for an expandable inverter according to claim 3, wherein: the power mode The block (3) and the capacitor module (7) are electrically connected together by a laminated busbar (8), and an external DC power source is input to each power module (3) through the laminated busbar (8).
A mechanical assembly for an expandable inverter according to claim 3 or 4, characterized in that a top opening (101) and a bottom opening (102) are formed at the top and the bottom of the inverter housing (1), respectively. A top cover (91) is mounted on the top of the inverter case (1) to seal the top opening (101), and a bottom cover (92) is mounted on the bottom of the inverter case (1) to seal the bottom opening. (102).
A mechanical assembly for an expandable inverter according to claim 5, wherein said top cover (91) is wedge-shaped, the bottom cover (92) is rectangular, and the heat sink (2) is disposed in a reverse In the middle position inside the transformer case (1), an upper cavity (1001) is formed between the top surface of the heat sink (2) and the top cover (91), and the capacitor module (7) is located in the upper cavity ( 1001) inside and mounted on the top surface of the heat sink (2), forming a lower cavity (1002) between the bottom surface of the heat sink (2) and the bottom cover (92), the power module (3) being located in the lower cavity Inside the body (1002) and mounted on the bottom surface of the heat sink (2).
A mechanical assembly for an expandable inverter according to claim 2 or 3 or 4, characterized in that: one AC output terminal (61) is mounted on each high voltage AC port, and each power module (3) The high-voltage AC output terminals are electrically connected to one AC output terminal (61), and each power module (3) and the AC output terminal (61) are electrically connected by an AC copper bus (611). And the AC copper bar (611) passes through the middle of the current sensor (612) mounted inside the inverter case (1).
A mechanical assembly for an expandable inverter according to claim 3 or 4, characterized in that a groove (24) is formed on the bottom surface of the heat sink (2) and mounted on the bottom surface of the heat sink (2) There is a cover plate (25) for sealing the groove (24), and a cooling water channel (20) is disposed inside the groove (24), M is equal to 3 or M is equal to 6 or M is equal to 9, 3 or 6 One or nine power modules (3) are mounted side by side on the bottom surface of the cover (25) of the heat sink (2).
The mechanical assembly of the expandable inverter according to claim 8, characterized in that each of the three power modules (3) is connected in parallel to form a three-phase full-bridge power module (30), and each three-phase full-bridge power The module (30) drives the three coil windings of the motor to operate in each of the three-phase full-bridge power modules (30) A capacitor module (7) is mounted on the top surface of the heat sink (2), and each three-phase full-bridge power module (30) is electrically connected to one capacitor module (7).
A mechanical assembly for an expandable inverter according to claim 9, characterized in that a laminated busbar (8) is arranged inside the inverter casing (1), said laminated busbar (8) ) comprising two DC busbars (81) insulated side by side, electrically connecting the capacitor module (7) to the three-phase full-bridge power module (30) through the laminated busbar (8), and the external DC power source is stacked The layer busbar (8) is input to each three-phase full-bridge power module (30).
A mechanical assembly for an expandable inverter according to claim 2 or 3 or 4, characterized in that a door substrate (41) is mounted on the bottom surface of each power module (3), and the circuit board is controlled ( 5) Control the driving circuit board (4), and drive the circuit board (4) to drive one power module (3) through one door substrate (41).
A mechanical assembly for an expandable inverter according to claim 11, wherein the driving circuit board (4) is mounted on the bottom surface of the door substrate (41), and the control circuit board (5) is located on the driving circuit board (4). Underneath, between the drive circuit board (4) and each of the door substrates (41), between the control circuit board (5) and the drive circuit board (4), electrical connection is made through the board-to-board connector (10) A low voltage signal connector (65) is mounted on one side of the inverter housing (1), and the low voltage signal connector (65) is electrically connected to the control circuit board (5).
A mechanical assembly for an expandable inverter according to claim 2 or 3 or 4, wherein the electronic switch of the upper half bridge and the electronic switch of the lower half bridge are both IGBTs, emitters of the upper half bridge IGBTs Connected to the collector of the IGBT of the lower half bridge and leads to form a high voltage AC output terminal, the collector and gate lead of the IGBT of the upper half bridge, and the gate and emitter lead of the IGBT of the lower half bridge The gate of the IGBT of the upper half bridge and the gate of the IGBT of the lower half bridge are connected to the driving circuit board (4).
A mechanical assembly for an expandable inverter according to claim 2 or 3 or 4, wherein the electronic switch of the upper half bridge and the electronic switch of the lower half bridge are both MOSFET and the source of the MOSFET of the upper half bridge Connected to the drain of the MOSFET of the lower half bridge and leads to form a high voltage AC output, the drain and gate of the MOSFET of the upper half of the bridge, and the gate and source of the MOSFET of the lower half of the bridge , The gate of the MOSFET of the upper half bridge and the gate of the MOSFET of the lower half bridge are connected to the driving circuit board (4).