Air-cooled inverter

Abstract

An air-cooled inverter relates to the technical field of electric power control equipment, and is characterized by comprising a case shell, a fan, a power device, a control circuit, a bus capacitor and a radiator, the interior of the case shell is provided with an air duct cavity, a power device cavity and a control circuit cavity through sheet metal parts, the air duct cavity is located at the inner position of the inner side of the case shell, and the power device cavity is located in the control circuit cavity. The power device cavity is located on the inner side of the case shell and located outside the air duct cavity, the control circuit cavity is located on the side portion of the inner side of the case shell, the fan is fixedly arranged at the top or the bottom in the air duct cavity, the power device is fixedly arranged in the power device cavity, and the control circuit is fixedly arranged in the control circuit cavity. The bus capacitors and the radiator are fixedly arranged in the air duct cavity, and the bus capacitors are positioned at the upper part of the radiator and are uniformly arranged in an array. The utility model has extremely high space utilization rate, is favorable for improving the machine performance, and prevents the strong electromagnetic field of the conducting bar from interfering with the PCB weak current circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of power control equipment, in particular to an air-cooled inverter. Background Art

[0002] With the rapid development of the domestic inverter industry, traditional 380V and 690V voltage level inverters have been unable to meet the ever-changing needs of customers and enterprises. In the fields of industrial automation, renewable energy, electric vehicles, etc., the requirements for inverters are no longer limited to basic energy conversion functions, but also emphasize the improvement of power density, cost-effectiveness, stability and reliability.

[0003] However, the performance of commonly used inverters cannot keep up with the rapid development of the industry, and the performance requirements of the inverter system have become a bottleneck restricting the progress of the industry. In order to ensure that forward-looking research and innovation can continue, inverters with higher power density, lower cost and better performance are needed to meet the needs of enterprises. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is to provide an air-cooled inverter to solve the problem that the layout of traditional inverter components is unreasonable, resulting in the conductive bar distance being too long and the lines being crisscrossed back and forth, resulting in high machine costs, large size, and the cabinet taking up too much space, and strong electricity and weak electricity are mixed together, resulting in strong electromagnetic fields interfering with the control circuit.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A wind-cooled inverter, characterized in that it includes a chassis shell, a fan, a power device, a control circuit, a bus capacitor and a radiator, the interior of the chassis shell is configured as an air duct cavity, a power device cavity and a control circuit cavity through sheet metal parts, the air duct cavity is located at an inner position inside the inner side of the chassis shell, the power device cavity is located inside the chassis shell and at an outer position of the air duct cavity, the control circuit cavity is located at an inner side position of the chassis shell, the fan is fixedly arranged at the top or bottom of the air duct cavity, the power device is fixedly arranged in the power device cavity, the control circuit is fixedly arranged in the control circuit cavity, the bus capacitor and the radiator are fixedly arranged in the air duct cavity, and the bus capacitor is located at the upper part of the radiator and is evenly arranged in an array.

[0007] A preferred technical solution, the power device includes an IGBT module, the IGBT module is fixedly arranged on the substrate of the heat sink, arranged in parallel in the horizontal direction and placed in the power device cavity, the bus capacitor is provided with a laminated busbar, the upper end of the laminated busbar is connected to the DC conductive bus, the lower end of the laminated busbar is connected to the positive and negative electrodes of the IGBT module, half of the laminated busbar is placed in the air duct cavity, and the other half is in the power device cavity.

[0008] A preferred technical solution, the power device includes a current transformer and an output conductive bar, the current transformer is placed at the lower end of the IGBT module, one end of the output conductive bar is connected to the IGBT module and passes through the current transformer, an IGBT driving board is arranged at the lower part of the IGBT module, and an absorption capacitor is arranged on the IGBT module.

[0009] According to a preferred technical solution, the control circuit includes a PCB control board and a fan DC power supply, and the PCB control board and the fan DC power supply are placed in a control circuit cavity.

[0010] The preferred technical solution also includes a braking unit module, which is installed between the fan and the bus capacitor. A braking conductive bar and a DC conductive bar are arranged side by side at one end of the braking unit module. The DC conductive bar includes a DC positive conductive bar and a DC negative conductive bar. The other end of the braking unit module is connected to the laminated busbar.

[0011] According to a preferred technical solution, a brake radiator is provided on the brake unit module, and the brake radiator is located in the air duct cavity.

[0012] According to a preferred technical solution, voltage-equalizing resistors are evenly arranged on the laminated busbars, and the voltage-equalizing resistors are located in the power device cavity.

[0013] According to a preferred technical solution, the control circuit cavity is separated by sheet metal to form an independent cavity.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. Provide a compact inverter structure layout to solve the technical problems of large size of existing inverters and too much space occupied by cabinets.

[0016] 2. This structural layout is a book-style layout, the chassis is very narrow, and the space utilization rate is extremely high. This structural layout has a higher power density than traditional inverters.

[0017] 3. The electrical layout of this structure is more reasonable. From top to bottom, the input bus terminal to the bus capacitor, the bus capacitor to the IGBT module, and the IGBT module to the output conductive bar are all done in one go. The devices are close to each other, which will reduce the length of the conductive bar to the extreme. Thus, the structural cost is also compressed to the minimum. Secondly, the distance between devices is the shortest, which also improves the performance of the machine.

[0018] 4. This structural layout has a more reasonable EMC layout, with strong current and weak current separated and not interfering with each other. The PCB circuit board is placed on the top plate to prevent the strong electromagnetic field of the conductive bus from interfering with the PCB weak current circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the first structure of the internal layout of the chassis shell of the utility model;

[0020] Figure 2 This is a schematic diagram of the second structural structure of the internal layout of the chassis shell of the utility model;

[0021] Figure 3 It is a schematic diagram of the structure of the utility model;

[0022] In the figure: 1. chassis shell; 2. fan; 3. heat sink; 4. power device; 5. control circuit; 6. bus capacitor; 7. brake unit module; 8. laminated busbar; 9. DC conductive bar; 10. voltage-equalizing resistor; 11. air duct cavity; 12. power device cavity; 13. control circuit cavity; 41. IGBT module; 42. current transformer; 43. output conductive bar; 44. IGBT driver board; 45. absorption capacitor; 51. PCB control board; 52. fan DC power supply; 71. brake conductive bar; 72. brake radiator. DETAILED DESCRIPTION

[0023] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] like Figure 1 , 2As shown in FIG. 3 , an air-cooled inverter includes a chassis housing 1, a fan 2, a power device 4, a control circuit 5, a bus capacitor 6 and a radiator 3. The interior of the chassis housing 1 is configured as a duct cavity 11, a power device cavity 12 and a control circuit cavity 13 through sheet metal parts. The duct cavity 11 is located inside the chassis housing 1, the power device cavity 12 is located inside the chassis housing 1 and outside the duct cavity 11, and the control circuit cavity 13 is located on the inner side of the chassis housing 1. The fan 2 is fixedly arranged at the top or bottom of the duct cavity 11, the power device 4 is fixedly arranged in the power device cavity 12, the control circuit 5 is fixedly arranged in the control circuit cavity 13, the bus capacitor 6 and the radiator 3 are fixedly arranged in the duct cavity 11, and the bus capacitor 6 is located on the upper part of the radiator 3 and is evenly arranged in an array. The laminated busbar 8 is evenly provided with equalizing resistors 10, and the equalizing resistors 10 are located in the power device cavity 12. The control circuit cavity 13 is separated by sheet metal to form an independent cavity.

[0026] like Figure 2 As shown, the power device 4 includes an IGBT module 41, which is fixedly arranged on the substrate of the heat sink 3 and arranged in parallel in the horizontal direction and placed in the power device cavity 12. A laminated busbar 8 is arranged on the bus capacitor 6, and the upper end of the laminated busbar 8 is connected to the DC conductive bar 9, and the lower end of the laminated busbar 8 is connected to the positive and negative electrodes of the IGBT module 41. Half of the laminated busbar 8 is placed in the air duct cavity 11, and the other half is in the power device cavity 12. The power device 4 includes a current transformer 42 and an output conductive bar 43. The current transformer 42 is placed at the lower end of the IGBT module 41. One end of the output conductive bar 43 is connected to the IGBT module 41 and passes through the current transformer 42. An IGBT driving board 44 is arranged at the lower part of the IGBT module 41, and an absorption capacitor 45 is arranged on the IGBT module 41. The control circuit 5 includes a PCB control board 51 and a fan DC power supply 52. ​​The PCB control board 51 and the fan DC power supply 52 are placed in the control circuit cavity 13.

[0027] like Figure 2 and 3 As shown, the brake unit module 7 is also included. The brake unit module 7 is installed between the fan 2 and the bus capacitor 6. A brake conductive bar 71 and a DC conductive bar 9 are arranged side by side at one end of the brake unit module 7. The DC conductive bar 9 includes a DC positive conductive bar and a DC negative conductive bar. The other end of the brake unit module 7 is connected to the laminated bus bar 8. A brake radiator 72 is arranged on the brake unit module 7, and the brake radiator 72 is located in the air duct cavity 11.

[0028] This embodiment is to place three gate-level IGBT modules in parallel on the heat sink, and each gate level is composed of one to multiple IGBT modules in a group, which are distributed in an array. The fan is an axial flow fan. The structural layout is a book-style layout, the chassis is very narrow, and the space utilization rate is extremely high. This structural layout has a higher power density than the traditional inverter. The electrical layout of this structural layout is more reasonable. From top to bottom, the input bus terminal to the bus capacitor, the bus capacitor to the I GBT module, and the I GBT module to the output conductive row are all done in one go. The devices are all close to each other, which will reduce the length of the conductive row to the extreme. Thereby, the structural cost is also compressed to the minimum. Secondly, the distance between devices is the shortest, which also improves the performance of the machine. The EMC layout of this structural layout is more reasonable, strong electricity and weak electricity are separated, and they do not interfere with each other. The PCB circuit board is placed on the top plate to prevent the strong electromagnetic field of the conductive row from interfering with the weak current circuit of the PCB.

[0029] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. An air-cooled inverter, characterized in that: The invention comprises a chassis shell (1), a fan (2), a power device (4), a control circuit (5), a busbar capacitor (6) and a heat sink (3); the interior of the chassis shell (1) is configured as an air duct cavity (11), a power device cavity (12) and a control circuit cavity (13) through sheet metal parts; the air duct cavity (11) is located inside the chassis shell (1); the power device cavity (12) is located inside the chassis shell (1) and outside the air duct cavity (11); and the control circuit cavity (13) is located inside the chassis shell (1). The control circuit cavity (13) is located at the inner side of the chassis shell (1), the fan (2) is fixedly arranged at the top or bottom of the air duct cavity (11), the power device (4) is fixedly arranged in the power device cavity (12), the control circuit (5) is fixedly arranged in the control circuit cavity (13), the bus capacitor (6) and the heat sink (3) are fixedly arranged in the air duct cavity (11), and the bus capacitor (6) is located on the upper part of the heat sink (3) and is evenly arranged in an array.

2. The air-cooled inverter according to claim 1, characterized in that: The power device (4) comprises an IGBT module (41), which is fixedly arranged on a substrate of a heat sink (3) and arranged in parallel in a horizontal direction and placed in a power device cavity (12). A laminated busbar (8) is arranged on the bus capacitor (6), the upper end of the laminated busbar (8) is connected to a DC conductive busbar (9), and the lower end of the laminated busbar (8) is connected to the positive and negative electrodes of the IGBT module (41). Half of the laminated busbar (8) is placed in the air duct cavity (11), and the other half is in the power device cavity (12).

3. The air-cooled inverter according to claim 2, characterized in that: The power device (4) comprises a current transformer (42) and an output conductive bar (43); the current transformer (42) is disposed at the lower end of the IGBT module (41); one end of the output conductive bar (43) is connected to the IGBT module (41) and passes through the current transformer (42); an IGBT driving board (44) is disposed at the lower part of the IGBT module (41); and an absorption capacitor (45) is disposed on the IGBT module (41).

4. The air-cooled inverter according to claim 3, characterized in that: The control circuit (5) comprises a PCB control board (51) and a fan DC power supply (52), and the PCB control board (51) and the fan DC power supply (52) are placed in the control circuit cavity (13).

5. The air-cooled inverter according to claim 2, characterized in that: It also includes a braking unit module (7), wherein the braking unit module (7) is installed between the fan (2) and the bus capacitor (6), and one end of the braking unit module (7) is provided with a braking conductive bar (71) and a DC conductive bar (9) in parallel, wherein the DC conductive bar (9) includes a DC positive conductive bar and a DC negative conductive bar, and the other end of the braking unit module (7) is connected to the laminated bus bar (8).

6. The air-cooled inverter according to claim 5, characterized in that: The brake unit module (7) is provided with a brake radiator (72), and the brake radiator (72) is located in the air duct cavity (11).

7. The air-cooled inverter according to claim 2, characterized in that: The laminated busbar (8) is evenly provided with voltage-equalizing resistors (10), and the voltage-equalizing resistors (10) are located in the power device cavity (12).

8. An air-cooled inverter according to any one of claims 1 to 7, characterized in that: The control circuit cavity (13) is separated by a sheet metal part to form an independent cavity.

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