Power module packaged by multiple TO-262 chips

Abstract

The utility model belongs to the technical field of power modules, and particularly relates to a multiple TO-262 packaged power module, which comprises a lower cover, a positioning circuit board is fixedly connected in the lower cover, an elastic ejector pin is fixedly connected at the upper end of the positioning circuit board, a power tube is connected in the positioning circuit board in a sliding manner, and the power tube is connected with the elastic ejector pin in a sliding manner. The power tube is in contact with the elastic ejector pin, and the upper end of the power tube is in contact with a long ceramic chip. According to the utility model, the three micro elastic ejector pins are respectively fixed on the position of each power tube on the positioning circuit board, and the power tubes are respectively and independently inserted into the mounting holes of the positioning circuit board, so that the upper surfaces of the power tubes can be ensured to be in a coplanar state after the long ceramic chip and the upper cover and lower cover assembly are combined; as the gap between the long ceramic chip and the power tube is coated with very thin glue, excessive glue between the power tube and the long ceramic chip can be extruded to one side under the pressure, so that the optimal contact area is realized, and a plurality of TO-262 packaged power modules are more convenient to form.

Description

Technical Field

[0001] The utility model relates to the technical field of power modules, and particularly relates to a power module with multiple TO-262 packages. Background Art

[0002] The TO-262 package is a type of power module package, which is a package with a specific shape and pin layout, and is usually used for power electronic devices. Common single TO-262 package power modules include: IGBT module: The IGBT (Insulated Gate Bipolar Transistor) module is a common power switching device, and is often used in applications such as motor drives and frequency converters. MOSFET module: The MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) module is a semiconductor device used for power switching and amplification, and is often used in applications such as DC-DC converters and inverters. Rectifier module: The rectifier module is a power module used to convert alternating current into direct current, and is often used in applications such as power supplies and frequency converters. Rectifier bridge module: The rectifier bridge module is a power module containing multiple rectifier diodes or rectifier thyristors, and is often used for the rectification and commutation control of AC power supplies. However, currently, single-package power modules are generally more common in the market, and power modules with multiple TO-262 packages are relatively rare, that is, it is not convenient to package power modules with multiple TO-262 packages. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a power module with multiple TO-262 packages, which solves the problem that it is not convenient to package power modules with multiple TO-262 packages.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A power module with multiple TO-262 packages, including a lower cover, a positioning circuit board is fixedly connected inside the lower cover, an elastic ejector pin is fixedly connected to the upper end of the positioning circuit board, a power tube is slidably connected inside the positioning circuit board, the power tube contacts the elastic ejector pin, a long ceramic chip contacts the upper end of the power tube, an upper cover contacts the upper end of the lower cover, a positioning block is fixedly connected to the lower end of the upper cover, the positioning block is slidably connected to the lower cover, and a limiting mechanism is arranged inside the lower cover.

[0005] Preferably, the upper cover contacts the power tube, and the upper cover is slidably connected to the long ceramic chip. Through the design of the upper cover, the long ceramic chip can be attached to the power tube.

[0006] Preferably, the limiting mechanism includes a limiting plate which is slidably connected to the inside of the lower cover. A clamping rod is fixedly connected to one side of the limiting plate close to the lower cover. The clamping rod is slidably connected to the lower cover and also slidably connected to the positioning block. A sliding rod is fixedly connected to one side of the limiting plate close to the lower cover. The sliding rod is slidably connected to the lower cover. A limiting ring is fixedly connected to the inside of the lower cover. A spring is arranged on the outer side of the sliding rod. Move the limiting plate away from the lower cover, so that the limiting plate drives the sliding rod to move, and the sliding rod compresses the spring. Then combine the upper cover and the lower cover, so that the positioning block at the lower end of the upper cover slides into the lower cover. Then release the limiting plate, and the elastic force of the spring will drive the sliding rod to move, so that the sliding rod drives the limiting plate to move, and the limiting plate drives the clamping rod to slide into the positioning block, and then the upper cover can be fixed to the lower cover.

[0007] Preferably, a clamping block is fixedly connected to one side of the limiting plate close to the lower cover. The clamping block is clamped with the lower cover. Through the design of the clamping block, the limiting plate can be limited.

[0008] Preferably, the limiting ring contacts the limiting plate and is slidably connected to the sliding rod. Through the design of the limiting ring, the sliding rod can be limited.

[0009] Preferably, one end of the spring contacts the limiting ring, and the other end of the spring contacts the sliding rod. Through the design of the spring, the clamping rod can be driven to limit the upper cover.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] 1. In the present utility model, three micro elastic thimbles are respectively fixed at the position of each power tube on the positioning circuit board. The power tubes are respectively inserted into the mounting holes of the positioning circuit board separately. After the long ceramic chip, the upper cover and the lower cover assembly are combined, it can be ensured that the upper surfaces of the respective power tubes are coplanar. Since a very thin layer of glue is applied between the long ceramic chip and the power tube, the excessive glue between the power tube and the long ceramic chip can be squeezed to one side under pressure, so as to achieve the optimal contact area, and thus make the molding of multiple power modules encapsulated in TO-262 more convenient.

[0012] 2. By arranging components such as a limiting plate, a clamping rod, and a spring, the present utility model can make the spring drive the clamping rod on the limiting plate to limit the positioning block, that is, limit the upper cover, so that the connection between the upper cover and the lower cover is stable, and thus avoid the phenomenon of offset and looseness after the upper cover is installed. Description of the Drawings

[0013] Figure 1 is the overall structural schematic diagram of the present utility model;

[0014] Figure 2 is the enlarged view of the structure of part A in the Figure 1 of the present utility model;

[0015] Figure 3 For the present utility model Figure 1 an enlarged view of the structure of part B in

[0016] Figure 4 For the present utility model Figure 3 a three-dimensional view of the limit plate of

[0017] In the figure: 1, lower cover; 11, positioning circuit board; 12, elastic thimble; 13, power transistor; 14, long ceramic chip; 15, upper cover; 2, positioning block; 3, limiting mechanism; 31, limit plate; 32, clamping rod; 33, clamping block; 34, sliding rod; 35, limit ring; 36, spring. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0019] Please refer to Figures 1-4 , a power module with multiple TO-262 packages, including a lower cover 1, a positioning circuit board 11 fixedly connected inside the lower cover 1, an elastic thimble 12 fixedly connected to the upper end of the positioning circuit board 11, a power transistor 13 slidably connected inside the positioning circuit board 11, the power transistor 13 contacting the elastic thimble 12, a long ceramic chip 14 contacting the upper end of the power transistor 13, an upper cover 15 contacting the upper end of the lower cover 1, the upper cover 15 contacting the power transistor 13, the upper cover 15 being slidably connected to the long ceramic chip 14. Through the design of the upper cover 15, the long ceramic chip 14 can be made to fit with the power transistor 13. A positioning block 2 is fixedly connected to the lower end of the upper cover 15, the positioning block 2 being slidably connected to the lower cover 1, and a limiting mechanism 3 is provided inside the lower cover 1.

[0020] Please refer to Figures 2-4 , the limiting mechanism 3 includes a limit plate 31, the limit plate 31 being slidably connected inside the lower cover 1. A clamping rod 32 is fixedly connected to the side of the limit plate 31 close to the lower cover 1, the clamping rod 32 being slidably connected to the lower cover 1 and the positioning block 2. A clamping block 33 is fixedly connected to the side of the limit plate 31 close to the lower cover 1, the clamping block 33 being clamped to the lower cover 1. Through the design of the clamping block 33, the limit plate 31 can be limited. A sliding rod 34 is fixedly connected to the side of the limit plate 31 close to the lower cover 1, the sliding rod 34 being slidably connected to the lower cover 1. A limit ring 35 is fixedly connected inside the lower cover 1, the limit ring 35 contacting the limit plate 31 and being slidably connected to the sliding rod 34. Through the design of the limit ring 35, the sliding rod 34 can be limited.

[0021] Please refer to Figures 2-4 Figures 2-4 , a spring 36 is arranged on the outer side of the sliding rod 34. One end of the spring 36 contacts the limiting ring 35, and the other end of the spring 36 contacts the sliding rod 34. Through the design of the spring 36, the clamping rod 32 can be driven to limit the upper cover 15. Move the limiting plate 31 away from the lower cover 1, so that the limiting plate 31 drives the sliding rod 34 to move, so that the sliding rod 34 squeezes the spring 36, and then the upper cover 15 and the lower cover 1 are combined, so that the positioning block 2 at the lower end of the upper cover 15 slides into the lower cover 1. Then release the limiting plate 31, and the elastic force of the spring 36 will drive the sliding rod 34 to move, so that the sliding rod 34 drives the limiting plate 31 to move, so that the limiting plate 31 drives the clamping rod 32 to slide into the positioning block 2, and the upper cover 15 can be fixed on the lower cover 1.

[0022] The specific implementation process of the present utility model is as follows: During use, the power tubes 13 are respectively inserted into the mounting holes of the positioning circuit board 11 alone. The tube bodies of the power tubes 13 are sunk into the grids of the lower cover 1 for correct positioning, so that the power tubes 13 are in contact with the elastic thimbles 12. Then, the surface of the long ceramic chip 14 is coated with a colloid, and it is embedded into the upper cover 15. Move the limiting plate 31 away from the lower cover 1, so that the limiting plate 31 drives the sliding rod 34 to move, so that the sliding rod 34 squeezes the spring 36, and then the upper cover 15 and the lower cover 1 are combined, so that the positioning block 2 at the lower end of the upper cover 15 slides into the lower cover 1. Then release the limiting plate 31, and the elastic force of the spring 36 will drive the sliding rod 34 to move, so that the sliding rod 34 drives the limiting plate 31 to move, so that the limiting plate 31 drives the clamping rod 32 to slide into the positioning block 2, and the upper cover 15 can be fixed on the lower cover 1. Then ensure that the upper surfaces of the power tubes 13 are in contact with the long ceramic chip 14. Since a very thin layer of glue is applied between the long ceramic chip 14 and the power tubes 13, the excess glue between the power tubes 13 and the long ceramic chip 14 can be squeezed to one side under pressure, so as to achieve the optimal contact area. After the glue dries, by moving the limiting plate 31, the limiting plate 31 drives the clamping rod 32 to slide out of the positioning block 2, and the limit on the upper cover 15 can be released, and the upper cover 15 can be removed. Then, multiple finished TO-262 packaged power modules are taken out.

[0023] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A power module with multiple TO-262 packages, comprising a lower cover (1), characterized in that: The lower cover (1) is fixedly connected to a positioning circuit board (11) inside, the upper end of the positioning circuit board (11) is fixedly connected to an elastic ejector pin (12), the inner part of the positioning circuit board (11) is slidably connected to a power tube (13), the power tube (13) is in contact with the elastic ejector pin (12), the upper end of the power tube (13) is in contact with a long ceramic sheet (14), the upper end of the lower cover (1) is in contact with an upper cover (15), the lower end of the upper cover (15) is fixedly connected to a positioning block (2), the positioning block (2) is slidably connected to the lower cover (1), and a limiting mechanism (3) is arranged inside the lower cover (1).

2. A power module with multiple TO-262 packages according to claim 1, characterized in that: The upper cover (15) is in contact with the power tube (13), and the upper cover (15) is slidably connected to the long ceramic sheet (14).

3. The power module of multiple TO-262 packages according to claim 1, characterized in that: The limiting mechanism (3) comprises a limiting plate (31), the interior of the lower cover (1) is slidably connected to the limiting plate (31), a side of the limiting plate (31) close to the lower cover (1) is fixedly connected to a clamping rod (32), the clamping rod (32) is slidably connected to the lower cover (1), the clamping rod (32) is slidably connected to the positioning block (2), a side of the limiting plate (31) close to the lower cover (1) is fixedly connected to a sliding rod (34), the sliding rod (34) is slidably connected to the lower cover (1), a limiting ring (35) is fixedly connected to the interior of the lower cover (1), and a spring (36) is arranged on the outer side of the sliding rod (34).

4. The power module of multiple TO-262 packages according to claim 3, characterized in that: A clamping block (33) is fixedly connected to one side of the limiting plate (31) close to the lower cover (1), and the clamping block (33) is clamped to the lower cover (1).

5. The power module of multiple TO-262 packages according to claim 3, characterized in that: The limiting ring (35) is in contact with the limiting plate (31), and the limiting ring (35) is slidably connected to the sliding rod (34).

6. The power module of multiple TO-262 packages according to claim 3, characterized in that: One end of the spring (36) contacts the limiting ring (35), and the other end of the spring (36) contacts the sliding rod (34).

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