Air-cooled frequency converter
By adopting the book layout and the design of the independent air duct in the inverter, the traditional inverter has a higher power density and electromagnetic compatibility due to the severe thermal set of large and high cost due to the serious thermal set.
Patent Information
- Application Number
- CN202421009937.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-10
AI Technical Summary
When traditional inverters are connected in parallel with multiple IGBT modules, they require a large radiator due to the serious heat collection, resulting in large chassis volume, high structural cost, and conductive bypasses increase structural material costs.
Design a kind of air -cooled inverter, using a book -based layout, symmetrically placed the IGBT module and the rectifier module, the electrolytic capacitance is included in the symmetrical placement on both sides, and there is an independent air duct in the middle. The radiator is installed in the middle air duct.
The layout of the inverter with a compact structure and a better heat dissipation effect is achieved, the spatial utilization rate is improved, the power density is improved, the resistance and inductance are reduced, the overall performance is enhanced, and the electromagnetic compatibility is effectively improved.
Smart Images
Figure CN222423496U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric power control equipment, in particular to an air-cooled frequency converter. Background Art
[0002] With the rapid development of the domestic inverter industry, the demand for higher power density, lower cost and better performance has become increasingly prominent. This is mainly because the existing 380V and 690V voltage level inverters can no longer meet the growing needs of customers and enterprises. In the fields of industrial automation, power transmission, motor control, etc., the requirements for inverters are not only to provide basic motor control functions, but also to make continuous improvements in high efficiency, stability, reliability and maintainability.
[0003] However, the design architecture of traditional inverters has some limitations. The commonly used design method is to use one IGBT for one gate-level driver board. This design is simple and reliable, but as the power demand increases, the number of IGBT modules required and the rated current of each module also increase. This not only increases the complexity and cost of the system, but also brings heat dissipation problems. The inverter requires a more powerful heat dissipation system to maintain a stable operating temperature, which leads to an increase in size and cost, limiting its application in some scenarios. Utility Model Content
[0004] In view of the deficiencies of the above-mentioned prior art, the technical problem to be solved by the utility model is to provide an air-cooled inverter to solve the problem that when multiple I GBT modules are connected in parallel, a large radiator is required to dissipate heat due to severe heat collection in the modules, resulting in a large chassis volume and often high structural costs. Due to the large space, the conductive rows have to be wound around, further leading to an increase in the cost of structural materials.
[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 radiator, a power device and a control circuit, the interior of the chassis shell is divided from left to right into a left power device cavity, a middle air duct cavity and a right power device cavity, the fan is fixedly arranged at the upper end or the lower end of the chassis shell and corresponds to the position of the middle air duct cavity, the radiator is fixedly installed in the middle air duct cavity, the power devices are respectively arranged in the left power device cavity and the right power device cavity, and the control circuit is fixedly arranged on the front side of the chassis shell.
[0007] According to a preferred technical solution, the front side of the chassis shell is folded into an independent control circuit cavity by sheet metal, and the control circuit is fixedly arranged in the control circuit cavity.
[0008] A preferred technical solution, the power device includes an electrolytic capacitor, an IGBT module and a rectifier module, the electrolytic capacitors are symmetrically installed inside the chassis shell and are respectively located in the left power device cavity and the right power device cavity, the IGBT module is fixedly installed on the substrate of the radiator and arranged in parallel along a first horizontal direction, the rectifier module is installed on the substrate of the radiator and arranged in a parallel array along a second horizontal direction, and the second horizontal direction is parallel to the first horizontal direction.
[0009] The preferred technical solution is that the gate drive board is non-detachably welded on the IGBT module, the inverter laminated conductive bar is detachably installed on the IGBT module, a current transformer is installed on the lower side of the IGBT module, a busbar conductive bar is detachably stacked on the rectifier module, a filter board is detachably installed on the busbar conductive bar, a surge absorption board and an absorption capacitor are detachably installed on the inverter laminated conductive bar, and a laminated busbar is installed on the electrolytic capacitor and the IGBT module.
[0010] A preferred technical solution is that a fan DC power supply, a DC positive conductive bar, a DC negative conductive bar, a brake unit module and a brake conductive bar are installed on the left and right sides of the fan and located on the inner side of the chassis shell. The brake unit module, the brake conductive bar and the DC positive conductive bar and the DC negative conductive bar are placed side by side.
[0011] A preferred technical solution, the control circuit includes one or more of a thyristor drive board, a control board, an operating keyboard, an IGBT drive board, an input conductive bar and an output conductive bar, and the thyristor drive board, the control board, the operating keyboard, the IGBT drive board, the input conductive bar and the output conductive bar are arranged on the front side of the chassis shell and are located in the control circuit cavity.
[0012] According to a preferred technical solution, the thyristor drive board and the IGBT drive board are mounted on a substrate of a heat sink.
[0013] According to a preferred technical solution, the input conductive bar and the output conductive bar are installed at the bottom of the chassis shell.
[0014] Compared with the prior art, the beneficial effects of the utility model are:
[0015] 1. Aiming at the problems of multiple modules in parallel at each gate level of existing inverters, large size and poor heat dissipation, we proposed an inverter layout scheme with compact structure and better heat dissipation effect.
[0016] 2. The new structural layout adopts a book-style layout, with the IGBT module and the rectifier module placed symmetrically, and the electrolytic capacitors placed symmetrically on both sides. An independent air duct is provided in the middle, so that the devices are distributed on both sides in sequence, which greatly improves the space utilization rate, thereby greatly improving the power density of the inverter.
[0017] 3. In terms of electrical layout, this structural layout is more reasonable. The distance from each IGBT module and rectifier module to the electrolytic capacitor is the shortest, which effectively reduces the length of the circuit path, reduces resistance and inductance, and improves the performance of the entire inverter.
[0018] 4. In terms of EMC (electromagnetic compatibility) layout, this structural layout also takes into account the separation of strong electricity and weak electricity. By placing the PCB circuit board on the top plate, it effectively prevents the strong electromagnetic field of the conductive bus from interfering with the PCB weak current circuit, thereby effectively improving the electromagnetic compatibility of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the structure of the utility model;
[0020] Figure 2 This is a schematic diagram of the first structure of the internal layout of the chassis shell of the utility model;
[0021] Figure 3 This is a second structural schematic diagram of the internal layout of the chassis shell of the utility model;
[0022] Figure 4 This is a schematic diagram of the structure of the utility model after removing part of the control circuit from the front side of the chassis shell;
[0023] In the figure: 1, chassis shell; 2, fan; 3, heat sink; 4, power device; 5, control circuit; 6, fan DC power supply; 7, DC positive conductive bar; 8, DC negative conductive bar; 41, electrolytic capacitor; 42, IGBT module; 43, rectifier module; 44, filter board; 45, surge absorption board; 46, absorption capacitor; 47, current transformer; 51, thyristor driver board; 52, control board; 53, operation keyboard; 54, IGBT driver board; 56, input conductive bar; 57, output conductive bar. DETAILED DESCRIPTION
[0024] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.
[0025] 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.
[0026] Example 1
[0027] like Figure 1 and 2As shown, an air-cooled inverter includes a chassis shell 1, a fan 2, a radiator 3, a power device 4 and a control circuit 5. The interior of the chassis shell 1 is divided from left to right into a left power device cavity, a middle air duct cavity and a right power device cavity. The fan 2 is fixedly arranged at the upper end of the chassis shell 1 and corresponds to the position of the middle air duct cavity. The radiator 3 is fixedly installed in the middle air duct cavity. The power device 4 is respectively arranged in the left power device cavity and the right power device cavity. The control circuit 5 is fixedly arranged on the front side of the chassis shell. The front side of the chassis shell 1 is folded into an independent control circuit cavity by sheet metal, and the control circuit 5 is fixedly arranged in the control circuit cavity. The chassis shell 1 is composed of two front and rear sheet metals from top to bottom to form a beam, and the strength is increased by folding. The back plate at the back is used for wall hanging, and the front sheet metal is folded into an independent control circuit cavity. The control circuit 5 is placed therein to play a shielding role. Then, two left and right sheet metals are fixed before the front and rear plates to form a crossbeam.
[0028] like Figure 2 As shown, the power device 4 includes an electrolytic capacitor 41, an IGBT module 42 and a rectifier module 43. The electrolytic capacitor 41 is symmetrically installed inside the chassis housing 1 and is respectively located in the left power device cavity and the right power device cavity. The IGBT module 42 is fixedly installed on the substrate of the radiator 3 and arranged in parallel along the first horizontal direction. The rectifier module 43 is installed on the substrate of the radiator 3 and arranged in parallel array along the second horizontal direction, and the second horizontal direction is parallel to the first horizontal direction. The gate driver board is welded non-detachably on the IGBT module 42, the inverter laminated conductive bar is detachably installed on the IGBT module 42, a current transformer 47 is installed on the lower side of the IGBT module 42, a busbar conductive bar is detachably stacked on the rectifier module 43, a filter board 44 is detachably installed on the busbar conductive bar, a surge absorption board 45 and an absorption capacitor 46 are detachably installed on the inverter laminated conductive bar, and a laminated busbar is installed on the electrolytic capacitor 41 and the IGBT module 42.
[0029] like Figure 2 and 3 As shown, a fan DC power supply 6, a DC positive conductive bar 7, a DC negative conductive bar 8, a brake unit module and a brake conductive bar are installed on the left and right sides of the fan 2 and located on the inner side of the chassis shell 1. The brake unit module, the brake conductive bar and the DC positive conductive bar 7 and the DC negative conductive bar 8 are placed side by side.
[0030] like Figure 2 , 3As shown in Figure 4, the control circuit 5 includes one or more of a thyristor drive board 51, a control board 52, an operation keyboard 53, an IGBT drive board 54, an input conductive bar 56, and an output conductive bar 57. The thyristor drive board 51, the control board 52, the operation keyboard 53, the IGBT drive board 54, the input conductive bar 56, and the output conductive bar 57 are arranged on the front side of the chassis housing 1 and located in the control circuit cavity. The thyristor drive board 51 and the IGBT drive board 54 are mounted on the substrate of the radiator 3. The input conductive bar 56 and the output conductive bar 57 are mounted at the bottom of the chassis housing 1.
[0031] In this embodiment, the heat sinks 3 are placed opposite to each other, with two gate-level IGBT modules 42 placed on one side of the heat sink 3, and one gate-level IGBT module 42 and a rectifier module 43 placed on the other side, and each gate level is composed of one or more IGBT modules 42. In this embodiment, the electrolytic capacitors 41 are placed symmetrically at the rear end of the heat sink 3, and a laminated busbar is placed on the electrolytic capacitors 41. The laminated busbar connects the rectifier module 43, the IGBT module 42, the DC positive conductive bar 7, and the DC negative conductive bar 8. The laminated busbars on the left and right sides are connected together through two conductive bars passing through the air duct.
[0032] In the second embodiment, the fan 2 is fixedly arranged at the lower end of the chassis shell 1 and corresponds to the position of the middle air duct cavity, and the other structures are consistent with those of the first embodiment.
[0033] 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 heat sink (3), a power device (4) and a control circuit (5); the interior of the chassis shell (1) is divided from left to right into a left power device cavity, a middle air duct cavity and a right power device cavity; the fan (2) is fixedly arranged at the upper end or the lower end of the chassis shell (1) and corresponds to the position of the middle air duct cavity; the heat sink (3) is fixedly installed in the middle air duct cavity; the power device (4) is respectively arranged in the left power device cavity and the right power device cavity; and the control circuit (5) is fixedly arranged at the front side of the chassis shell.
2. The air-cooled inverter according to claim 1, characterized in that: The front side of the chassis shell (1) is folded into an independent control circuit cavity by sheet metal, and the control circuit (5) is fixedly arranged in the control circuit cavity.
3. The air-cooled inverter according to claim 1, characterized in that: The power device (4) comprises an electrolytic capacitor (41), an IGBT module (42) and a rectifier module (43); the electrolytic capacitor (41) is symmetrically mounted inside the chassis housing (1) and is located in a left power device cavity and a right power device cavity respectively; the IGBT module (42) is fixedly mounted on a substrate of the heat sink (3) and arranged in parallel along a first horizontal direction; the rectifier module (43) is mounted on a substrate of the heat sink (3) and arranged in a parallel array along a second horizontal direction, and the second horizontal direction is parallel to the first horizontal direction.
4. The air-cooled inverter according to claim 3, characterized in that: The IGBT module (42) is welded with a gate drive board in an indestructible manner, the IGBT module (42) is detachably mounted with an inverter laminated conductive bar, a current transformer (47) is mounted on the lower side of the IGBT module (42), a busbar conductive bar is detachably mounted on the rectifier module (43), a filter board (44) is detachably mounted on the busbar conductive bar, a surge absorption board (45) and an absorption capacitor (46) are detachably mounted on the inverter laminated conductive bar, and a laminated busbar is mounted on the electrolytic capacitor (41) and the IGBT module (42).
5. The air-cooled inverter according to claim 1, characterized in that: A fan DC power supply (6), a DC positive conductive bar (7), a DC negative conductive bar (8), a brake unit module and a brake conductive bar are installed on the left and right sides of the fan (2) and located inside the chassis shell (1). The brake unit module, the brake conductive bar and the DC positive conductive bar (7) and the DC negative conductive bar (8) are placed in parallel.
6. An air-cooled inverter according to any one of claims 1 to 5, characterized in that: The control circuit (5) comprises one or more of a thyristor drive board (51), a control board (52), an operation keyboard (53), an IGBT drive board (54), an input conductive bar (56), and an output conductive bar (57); the thyristor drive board (51), the control board (52), the operation keyboard (53), the IGBT drive board (54), the input conductive bar (56), and the output conductive bar (57) are arranged on the front side of the chassis shell (1) and are located in the control circuit cavity.
7. The air-cooled inverter according to claim 6, characterized in that: The thyristor drive board (51) and the IGBT drive board (54) are mounted on a substrate of the heat sink (3).
8. The air-cooled inverter according to claim 6, characterized in that: The input conductive bar (56) and the output conductive bar (57) are installed at the bottom of the chassis housing (1).