Weather resistance protection device for power module

Abstract

The utility model discloses a power module weatherability protection device, a power module comprises a power module packaging housing, the packaged power module is welded on a PCB, the junction of the power module packaging housing and the PCB is provided with a gap, and the gap is filled with a sealing layer; according to the utility model, the power module is firstly welded on the PCB, gaps exist on the four sides of the power module, and then the gaps on the four sides of the power module are filled with the electronic silica gel, so that the complete sealing of the power module is completed, and the electronic silica gel is used for sealing the power module and the back surface of the PCB, so that water vapor in a humid environment is prevented from entering the interior of the pin surface of the module; the problem of failure of the power module caused by the factors is avoided, and the electronic silica gel sealing method is low in cost and convenient to operate.

Description

Technical Field

[0001] The utility model belongs to the technical fields of wind power converters, large-scale energy storage on the grid side, industrial and commercial energy storage, household energy storage, frequency converters, UPS, air conditioning drives, servo drives, etc., and specifically relates to a power module weatherproof protection device, which prevents water vapor from entering the inside of the module pin surface in a humid environment, thereby eliminating the problem of power module failure caused by such factors. Background Art

[0002] At present, in industrial applications, many power electronic products need to use power modules as power conversion units. The power module needs to be installed with a heat sink for heat dissipation. Generally, it is located on the back of the PCB board by post-welding, and the pins face upward in space. For many power modules, there is a natural "groove" feature on the pin surface, such as the common package of easy2b. Many power module products are in high temperature, low temperature, and high humidity environments for a long time, especially outdoors. The "groove" slowly gathers water vapor and even forms condensation, causing the power module pins to be damaged due to reduced insulation. This is also an important factor in the failure of the power module products in the humid environment on the user side. In response to the above defects, there are usually two approaches: one is to improve the IP protection level of the power module product; the second is to add additional protective devices at the system level, such as heating circuits. These two methods have the disadvantages of high cost and large size, and the heat dissipation design is very redundant.

[0003] In order to solve the above technical problems, the utility model proposes a power module weatherproof protection device, which can prevent water vapor from entering the inside of the module pin surface in a humid environment, thereby eliminating the problem of power module failure caused by this factor. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the utility model is to provide a weather-resistant protection device for a power module, which can improve the reliability of the power module part in the product by adopting the idea of ​​local sealing without improving the IP level and other measures, and use electronic silicone to seal the module and the back of the PCB to prevent water vapor from entering the inside of the power module pin surface in a humid environment, thereby eliminating the problem of power module failure caused by this factor. The electronic silicone sealing method has low cost and is easy to operate.

[0005] Specifically, the technical problem to be solved by the present invention is to provide a power module weatherproof protection device in view of the deficiencies in the above-mentioned prior art. The power module includes a power module packaging shell. The power module after packaging is welded on a PCB. There is a gap at the junction of the power module packaging shell and the PCB, and the gap is filled with a sealing layer.

[0006] Preferably, the sealing layer is an electronic silicone layer.

[0007] Preferably, the power module is an inverter bridge power module.

[0008] Preferably, the back side of the PCB is the side where the packaging body of the power module contacts the PCB.

[0009] Preferably, the sealing layer is completely sealed.

[0010] Compared with the prior art, the positive effects of the utility model are as follows: the power module weatherproof protection device in the utility model can achieve the idea of ​​local sealing without improving the IP level and other measures, improve the reliability of the power module part in the product, use electronic silicone to seal the power module and the back of the PCB, prevent water vapor from entering the inside of the power module pin surface in a humid environment, and eliminate the problem of power module failure caused by this factor. The electronic silicone sealing method is low in cost and easy to operate. Compared with the two traditional methods, the utility model has the following advantages: according to the idea of ​​physical sealing to improve the local protection level, electronic silicone is used to completely seal the junction between the power module pin surface and the PCB, which is easy to implement, low in cost and reliable in protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the power module in the utility model;

[0012] Figure 2 This is a front view of the power module weatherproof protection device in the utility model;

[0013] Figure 3 It is a top view of the weatherproof protection device for power module in the utility model;

[0014] The markings in the accompanying drawings are: 1-PCB, 2-power module, 3-gap, 4-sealing layer. DETAILED DESCRIPTION

[0015] Combine the following Figure 1-3 The utility model is further described with specific implementation methods.

[0016] See attached Figure 1-3 The utility model conceives a power module weatherproof protection device, the power module 2 includes a power module packaging shell, the power module 2 after packaging is welded on the PCB 1, the junction of the power module packaging shell and the PCB 1 has a gap 3, and the gap 3 is filled with a sealing layer 4;

[0017] The sealing layer 4 is an electronic silica gel layer;

[0018] The power module 2 is an inverter bridge power module;

[0019] The back side of the PCB1 is the surface where the package body of the power module 2 contacts the PCB1;

[0020] The sealing layer 4 is completely sealed;

[0021] The electronic silicone layer is made of industrial electronic silicone.

[0022] In actual use, the power module 2 is first soldered to the PCB 1. At this time, there will be gaps 3 on the four sides of the power module 2. Then, electronic silicone is filled into the gaps 3 on the four sides of the power module 2. After the filling is completed, the power module 2 is completely sealed.

[0023] In order to improve the reliability of the whole product in a humid environment, the present invention adopts an additional sealing device, the purpose of which is to improve the sealing between the power module 2 and the back of the PCB1, so as to completely isolate the pin surface of the power module 2 from the humid air, thereby improving the protection level of the power module 2 and avoiding insulation failure of the power module 2 due to moisture condensation, thereby improving the weather resistance of the product and reducing the failure rate.

[0024] Compared with the prior art, the positive effects of the utility model are as follows: the power module weatherproof protection device in the utility model can achieve the idea of ​​local sealing without improving the IP level and other measures, improve the reliability of the power module part in the product, use electronic silicone to seal the power module and the back of the PCB, prevent water vapor from entering the inside of the power module pin surface in a humid environment, and eliminate the problem of power module failure caused by this factor. The electronic silicone sealing method is low in cost and easy to operate. Compared with the two traditional methods, the utility model has the following advantages: according to the idea of ​​physical sealing to improve the local protection level, electronic silicone is used to completely seal the junction between the power module pin surface and the PCB, which is easy to implement, low in cost and reliable in protection.

[0025] In summary, the above only embodies the preferred technical solution of the present utility model. Any changes that may be made to certain parts thereof by those skilled in the art all embody the principles of the present utility model and should all be within the technical scope of the present utility model.

Claims

1. A power module weather protection device, characterized in that: The power module (2) comprises a power module packaging shell. After packaging, the power module (2) is welded on a PCB (1). A gap (3) is provided at the junction of the power module packaging shell and the PCB (1), and a sealing layer (4) is filled in the gap (3).

2. A power module weather protection device as claimed in claim 1, characterized in that: The sealing layer (4) is an electronic silica gel layer.

3. A power module weatherproof protection device as claimed in claim 2, characterized in that: The power module (2) is an inverter bridge power module.

4. A power module weatherproof protection device as claimed in claim 3, characterized in that: The back side of the PCB (1) is the side where the packaging body of the power module (2) contacts the PCB (1).

5. A power module weatherproof protection device as claimed in claim 4, characterized in that: The sealing layer (4) is completely sealed.

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