Flat packaging IGBT module protection device

Abstract

The utility model relates to a flat packaging IGBT module protection device, which comprises a body, two ends of the body are provided with body fixing holes, the same sides of the two ends of the body are provided with extension parts, the center of the upper surface of the body is fixedly provided with a positive and negative busbar baffle plate, and positive and negative busbar fixing holes are arranged between the positive and negative busbar baffle plate and the two body fixing holes; the device is characterized in that a first gap is arranged below the outer end of the extension part, and an accommodating cavity for accommodating a nut part of an IGBT fixing bolt is arranged on the extension part at the first gap; the periphery of the accommodating cavity is a bolt fence, and the bottom is a bolt cover plate. According to the flat packaging IGBT module protection device of the utility model, the positive and negative busbar baffle plates isolate the positive and negative input busbars, and as the nuts of the IGBT fixing bolts extend into the accommodating cavities, the IGBT fixing bolts are isolated from the positive and negative input busbars, and electrical isolation is formed between the IGBT fixing bolts and the positive and negative input busbars, so that the flat packaging IGBT module protection device meets the electrical safety requirements.

Description

Technical Field

[0001] The utility model relates to an IGBT module protection device, and more specifically, to a flat package IGBT module protection device. Background Art

[0002] At present, in electrical equipment such as medium and low voltage inverters and high voltage power units, major domestic and foreign brands are developing in the direction of high power and small size, and high power density products are gradually favored by the market. At the same time, small size means limited design space, and safety issues become the primary factor that should be considered in the product structure design process. Among the above-mentioned high-power products, the flat package IGBT module is the most important and one of the most widely used electrical devices. For the flat package IGBT module, the distance between its positive and negative terminals is relatively close. When designing the busbar, designers need to pay special attention to the safe distance between the positive and negative busbars, and if the busbar design is unreasonable, it will also cause discharge between the copper busbar and the module fixing bolts. At present, the most commonly used design method is to set up a protective structure to isolate the positive and negative terminals of the flat package IGBT module, but the design is too subjective and the versatility of the structure is poor. Therefore, it is necessary to develop a flat package IGBT module protection device with strong versatility and high protection performance to overcome the above technical difficulties. Summary of the invention

[0003] In order to overcome the disadvantages of the above technical problems, the utility model provides a flat package IGBT module protection device.

[0004] The utility model discloses a flat package IGBT module protection device, the module protection device comprises a body, body fixing holes are provided at both ends of the body, extension parts are provided on the same sides of both ends of the body, a positive and negative busbar baffle is fixed at the center of the upper surface of the body, and positive and negative busbar fixing holes are provided between the positive and negative busbar baffle and the two body fixing holes; the module protection device is fixed to the heat sink through the body fixing holes, and the positive input row and the negative input row are fixed through the positive and negative busbar fixing holes; it is characterized in that: a first notch for accommodating the end of the flat package IGBT module is provided below the outer end of the extension part, and an accommodating cavity with an opening facing downward for accommodating the nut part of the IGBT fixing bolt is provided on the extension part at the first notch; the periphery of the accommodating cavity is a bolt enclosure, and the bottom is a bolt cover plate.

[0005] The utility model discloses a flat package IGBT module protection device, wherein the positive and negative busbars are composed of a narrow section and a wide section in an integrated form, the narrow section and the wide section separate the positive input busbar from the negative input busbar, and the wide section separates the two connecting bolts connecting the absorption capacitor, the positive input busbar, the negative input busbar and the flat package IGBT module terminal; a second notch is provided below the outer end of the wide section to accommodate the end of the flat package IGBT module.

[0006] The utility model discloses a flat package IGBT module protection device, wherein the main body, the extension part and the positive and negative busbar baffles are an integrated structure formed by molding unsaturated polyester glass fiber reinforced molding material.

[0007] In the flat package IGBT module protection device of the utility model, the body fixing hole is a stepped countersunk hole which is wide at the top and narrow at the bottom, and the bolts for fixing the module protection device are located in the body fixing hole in the form of a stepped countersunk hole.

[0008] In the flat package IGBT module protection device of the utility model, fixing nuts are fixed in the positive and negative busbar fixing holes, and the center of the fixing nut is an internal threaded hole for fixing the positive input busbar and the negative input busbar.

[0009] The beneficial effect of the utility model is as follows: the flat package IGBT module protection device of the utility model is composed of a main body, a positive and negative busbar baffle fixed to the middle part of the main body, and an extension part fixed to both ends of the main body, and the end of the extension part is provided with a accommodating cavity with an opening facing downward to accommodate the nut of the IGBT fixing bolt, and the periphery and bottom of the accommodating cavity are respectively a bolt enclosure and a bolt cover plate, so that when the IGBT module protection device of the utility model is assembled and matched with the flat package IGBT module, the positive and negative input busbars, and the absorption capacitor and fixed to the heat sink, not only the positive and negative busbar baffles isolate the positive input busbar from the negative input busbar, ensuring that the positive and negative input busbars meet the electrical safety distance, but also, because the nut of the IGBT fixing bolt extends into the accommodating cavity, the bolt enclosure and the bolt cover plate isolate the IGBT fixing bolt from the positive and negative input busbars, so that electrical isolation is formed between them, avoiding the occurrence of discharge between the positive and negative input busbars and the IGBT fixing bolts, and at the same time is conducive to the miniaturization of the power unit formed by the flat package IGBT module.

[0010] Furthermore, by designing the positive and negative busbar baffles into narrow sections and wide sections, not only the electrical isolation between the positive input busbar and the negative input busbar is achieved, but the wide section also achieves electrical isolation between the two connecting bolts connecting the absorption capacitor, the positive and negative input busbars and the DC input end of the flat package IGBT module, ensuring that the electrical specifications are met between the positive and negative input busbars.

[0011] Furthermore, the main body, extension part and positive and negative busbar baffles are an integrated structure formed by molding unsaturated polyester glass fiber reinforced molding material. Compared with traditional plastic materials, they have high mechanical strength, convenient installation, high verticality of structural features, easy demoulding and low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A three-dimensional diagram of a flat package IGBT module protection device of the utility model;

[0013] Figure 2 A three-dimensional diagram of a flat package IGBT module protection device of the utility model;

[0014] Figure 3 A three-dimensional diagram of a flat package IGBT module protection device of the utility model;

[0015] Figure 4 This is a schematic diagram of the use of the flat package IGBT module protection device of the utility model;

[0016] Figure 5 for Figure 4 A magnified view of a local area;

[0017] Figure 6 It is a schematic diagram of the partial assembly explosion structure of the flat package IGBT module protection device of the utility model;

[0018] Figure 7 It is a partial cross-sectional view of the flat package IGBT module protection device of the present invention fixed to the heat sink.

[0019] In the figure: 1 body, 2 extension part, 3 positive and negative busbar baffle, 4 body fixing hole, 5 positive and negative busbar fixing hole, 6 first notch, 7 accommodating cavity, 8 bolt enclosure, 9 bolt cover, 10 narrow section, 11 wide section, 12 second notch, 13 fixing nut, 14 flat package IGBT module, 15 absorption capacitor, 16 positive input busbar, 17 negative input busbar, 18 heat sink, 19 connecting bolt, 20 IGBT fixing bolt, 21 nut, 22 module protection device. Implementation

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1 , Figure 2 and Figure 3 As shown, the three-dimensional diagram of the flat package IGBT module protection device of the utility model is given. The IGBT module protection device shown is composed of a body 1, which is in the shape of a rectangular parallelepiped. The two ends of the body 1 are provided with body fixing holes 4. The IGBT module protection device is fixed to the heat sink 18 or other fixing parts by bolts passing through the body fixing holes 4. An extension part 2 is provided on the same side of both ends of the body 1. A first notch 6 is provided below the outer end of the extension part 2. The first notch 6 is used to accommodate the end of the flat package IGBT module 14. A positive and negative busbar baffle 3 is fixed in the center of the upper surface of the body 1. The positive and negative busbar baffle 3 separates the positive input busbar 16 connected to the flat package IGBT module 14 from the negative input busbar 17; through the isolation effect of the positive and negative busbar baffle 3, it is ensured that the positive input busbar 16 and the negative input busbar 17 meet electrical isolation.

[0022] The extension part 2 at the first notch 6 is provided with a receiving chamber 7, the opening of the receiving chamber 7 faces downward, and the receiving chamber 7 is used to receive the nut 21 of the IGBT fixing bolt 20. The periphery of the receiving chamber 7 is provided with a bolt enclosure 8, and the bottom of the receiving chamber 7 is provided with a bolt cover plate 9. In this way, after the nut 21 of the IGBT fixing bolt 20 is inserted into the receiving chamber 7, the IGBT fixing bolt 20 is isolated from the positive input busbar 16 and the negative input busbar 17 by the joint blocking effect of the bolt enclosure 8 and the bolt cover plate 9, so that electrical isolation is formed, which can effectively avoid the occurrence of discharge between the positive input busbar 16 and the negative input busbar 17 and the IGBT fixing bolt 20. Furthermore, it is also conducive to the miniaturization of the power unit formed by the flat package IGBT module 14.

[0023] The positive and negative busbar baffle 3 shown is composed of a narrow section 10 and a wide section 11. The narrow section 10 and the wide section 11 are in an integrated structure. The narrow section 10 is fixed on the upper surface of the body 1, and the wide section 11 extends in the same direction as the extension portion 2. The narrow section 10 and the wide section 11 together isolate the positive input busbar 16 and the negative input busbar 17 connected to the flat package IGBT module 14. At the same time, the wide section 11 can also separate the two connecting bolts 19 connecting the absorption capacitor 15, the input busbar (positive input busbar 16 and negative input busbar 17) and the DC input end of the flat package IGBT module 14, further ensuring that the electrical isolation of the positive input busbar 16 and the negative input busbar 17 meets the safety requirements.

[0024] The main body 1, extension part 2 and positive and negative busbar baffles 3 shown are in an integrated form, which adopts an integrated structure formed by molding unsaturated polyester glass fiber reinforced molding material. Compared with traditional plastic materials, unsaturated polyester glass fiber reinforced molding material has high mechanical strength, convenient installation, easy demolding and low production cost.

[0025] The main body fixing hole 4 is a stepped countersunk hole that is wide at the top and narrow at the bottom. The module protection device 22 is fixed to the radiator 18 by sinking into the main body fixing hole 4 in the form of a stepped countersunk hole, which will not affect the installation of the positive input busbar 16 and the negative input busbar 17. The fixing nut 13 is fixed in the positive and negative busbar fixing holes 5 shown. The center of the fixing nut 13 is a threaded hole. The positive input busbar 16 and the negative input busbar 17 are fixed to the module protection device 22 by bolts screwed into the central threaded holes of the fixing nut 13.

[0026] like Figure 4 As shown, a schematic diagram of the use of the flat package IGBT module protection device of the utility model is given. Figure 5 An enlarged view of the local area is given. Figure 6 A schematic diagram of the partial assembly explosion structure of the flat package IGBT module protection device of the utility model is given. Figure 7 A partial cross-sectional view of the flat-package IGBT module protection device of the utility model fixed to the heat sink is given. A plurality of flat-package IGBT modules 14 are fixed to the heat sink 18 shown. When in use, firstly, both ends of the flat-package IGBT module 14 are fixed to the heat sink through two IGBT fixing bolts 20, and then the module protection device 22 is fixed to the end with positive and negative input terminals on the flat-package IGBT module 14, and the nut 21 at the upper end of the IGBT fixing bolt 20 is ensured to extend into the accommodating cavity 7 of the extension part 2. Then, the positive input busbar 16 and the negative input busbar 17 are fixed to the body 1 of the module protection device 22 by using the bolts screwed into the fixing nuts 13, and finally, the absorption capacitor 15, the positive input busbar 16, the negative input busbar 17 and the positive and negative input terminals of the flat-package IGBT module 14 are connected together by using the connecting bolts 19.

Claims

1. A flat package IGBT module protection device, the module protection device (22) comprising a body (1), body fixing holes (4) are provided at both ends of the body, extension portions (2) are provided on the same side of both ends of the body, a positive and negative busbar baffle (3) is fixed at the center of the upper surface of the body, and positive and negative busbar fixing holes (5) are provided between the positive and negative busbar baffle and the two body fixing holes; the module protection device is fixed to a heat sink (18) through the body fixing holes, and the positive input busbar (16) and the negative input busbar (17) are fixed through the positive and negative busbar fixing holes; the characteristics are: A first notch (6) for accommodating the end of the flat-package IGBT module is provided below the outer end of the extension portion, and a accommodating cavity (7) with an opening facing downwards for accommodating a nut (21) of an IGBT fixing bolt (20) is provided on the extension portion at the first notch; the periphery of the accommodating cavity is a bolt enclosure (8), and the bottom is a bolt cover plate (9).

2. The flat package IGBT module protection device according to claim 1, characterized in that: The positive and negative busbar baffles (3) are composed of a narrow section (10) and a wide section (11) in an integrated form, the narrow section and the wide section separate the positive input busbar (16) from the negative input busbar (17), and the wide section separates two connecting bolts (19) connecting the absorption capacitor (15), the positive input busbar (16), the negative input busbar (17) and the flat package IGBT module (14) terminal; a second notch (12) for accommodating the end of the flat package IGBT module (14) is provided below the outer end of the wide section.

3. The flat package IGBT module protection device according to claim 1 or 2, characterized in that: The main body (1), the extension part (2) and the positive and negative busbar baffles (3) are an integrated structure formed by molding unsaturated polyester glass fiber reinforced molding material.

4. The flat package IGBT module protection device according to claim 1 or 2, characterized in that: The main body fixing hole (4) is a stepped countersunk hole that is wider at the top and narrower at the bottom, and a bolt for fixing the module protection device (22) is located in the main body fixing hole in the form of a stepped countersunk hole.

5. The flat package IGBT module protection device according to claim 1 or 2, characterized in that: A fixing nut (13) is fixed in the positive and negative busbar fixing hole (5), and the center of the fixing nut is an internal threaded hole for fixing the positive input busbar (16) and the negative input busbar (17).

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