Double-face plastic package power supply module

Abstract

The utility model discloses a double-side plastic package power supply module, which comprises a PCB (printed circuit board) substrate, a power supply module, a power supply module, a power supply module, a power supply module, a power supply module, a power supply module and a power supply module, and is characterized in that electronic devices are respectively welded on the upper surface and the lower surface of the PCB substrate; the first plastic package body covers the lower surface of the PCB substrate; the second plastic package body covers the upper surface of the PCB substrate; the metal terminal is arranged on the upper surface of the PCB substrate and is covered by the second plastic package body, and one surface of the metal terminal is exposed out of the second plastic package body; one surface of the metal terminal, which is in contact with the PCB substrate, is provided with a groove, and the groove is filled with tin. According to the utility model, tin welded by the metal terminals and the PCB substrate, tin in the grooves of the metal terminals and tin welded by the pins form an integral body to form a structure similar to a bolt, so that the mechanical strength of welding points of the pins and a product is increased, and the anti-vibration performance of the product is improved.

Description

Technical Field

[0001] The utility model relates to an integrated circuit product using a PCB substrate as a substrate, in particular to a double-sided plastic-sealed power supply module. Background Art

[0002] For existing double-sided plastic-sealed products, when the length and width of the plastic-sealed body are the same as those of the PCB substrate, if the electrical contacts are led out from the side of the product. The electrical contacts may be solid metal terminals or copper sections exposed on the side of the product after the inner copper traces of the PCB substrate are cut. Such electrical contacts are generally all copper sections. The copper layer of the cross-section exposed by cutting is easily oxidized in the air. At the same time, the welding of such electrical contacts and pins is only the cross-section of the electrical contacts. These two points will affect the welding strength between the electrical contacts and the pins. When products with such assembly solutions are packaged in packaging tubes, the strength of the solder joints between the electrical contacts and the pins may decrease due to collisions between products during transportation, and in severe cases, the pins may even detach. Utility Model Content

[0003] The utility model aims to overcome at least one defect of the above-mentioned prior art. The purpose of the utility model is to provide a double-sided plastic-sealed power module to solve the problem of low solder joint strength caused by oxidation of the side of the electrical contact due to the mechanical connection strength of the solder joint formed by welding the pins and the electrical contacts on the side of the product.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a double-sided plastic-sealed power supply module, the double-sided plastic-sealed power supply module comprising:

[0006] A PCB substrate, wherein electronic components are respectively welded on the upper surface and the lower surface of the PCB substrate;

[0007] A first plastic package body, covering the lower surface of the PCB substrate;

[0008] A second plastic package body, covering the upper surface of the PCB substrate;

[0009] A metal terminal is arranged on the upper surface of the PCB substrate and is covered by the second plastic package, and one side of the metal terminal is exposed outside the second plastic package;

[0010] The metal terminal is provided with a groove on a surface in contact with the PCB substrate, and the groove is filled with tin.

[0011] Optionally, the metal terminal is made of copper or copper alloy.

[0012] Optionally, the first plastic package body, the PCB substrate and the second plastic package body have the same length and width.

[0013] Optionally, the metal terminal is fixed to the PCB substrate by soldering.

[0014] Optionally, one side of the metal terminal is exposed outside the second plastic package body, and is formed by cutting the metal terminal and the second plastic package body.

[0015] The utility model has the following beneficial effects:

[0016] 1. Through the structural optimization of the metal terminal as the electrical contact, a groove is opened in the metal terminal and filled with tin, so that a part of the electrical contact after cutting is the cross section of tin. The tin and the solder paste that forms the solder joint are the same component, which greatly increases the welding strength and improves the bonding strength between the pin and the product.

[0017] 2. Through the structural optimization of the metal terminal as the electrical contact, a groove is opened in the metal terminal and filled with tin. The tin welded between the metal terminal and the product, the tin in the groove of the metal terminal and the tin welded to the pin form a bolt structure, fixing the pin on the metal terminal, and increasing the bonding force between the pin and the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a cross-sectional view of a first embodiment of a double-sided plastic-sealed power module of the utility model;

[0019] Figure 2 This is a side view of the first embodiment of a double-sided plastic-sealed power module of the utility model without assembly pins;

[0020] Figure 3 This is a three-dimensional diagram of the first embodiment of a double-sided plastic-sealed power module of the utility model without assembly pins;

[0021] Figure 4 It is a three-dimensional diagram of a comparative scheme of the first embodiment of a double-sided plastic-sealed power module of the utility model.

[0022] The reference numerals in the above drawings are as follows:

[0023] 1. PCB substrate, 2. second plastic package, 3. first plastic package, 4. pins, 5. electronic components, 6. metal terminals, 7. tin, 701. tin soldered to the pins, 702. tin in the groove of the metal terminal, 703. tin soldered to the metal terminal and the PCB substrate, 8. groove. DETAILED DESCRIPTION

[0024] The present invention and its beneficial effects will be further described in detail below in conjunction with specific implementations and the accompanying drawings of the specification, but the specific implementations of the present invention are not limited thereto.

[0025] like Figure 1 to Figure 3 The embodiment of the utility model provides a double-sided plastic-sealed power module, and the double-sided plastic-sealed power module includes:

[0026] A PCB substrate 1, with electronic components 5 welded to the upper and lower surfaces of the PCB substrate 1;

[0027] A first plastic package body 2, covering the lower surface of the PCB substrate 1;

[0028] The second plastic package body 3 covers the upper surface of the PCB substrate 1;

[0029] The metal terminal 6 is disposed on the upper surface of the PCB substrate 1 and is covered by the second plastic package 3, and one side of the metal terminal 6 is exposed outside the second plastic package 3;

[0030] The metal terminal 6 is provided with a groove 8 on the surface in contact with the PCB substrate 1 , and the groove 8 is filled with tin.

[0031] In one embodiment, the metal terminal 6 is made of copper or copper alloy.

[0032] In this embodiment, the power supply product is composed of a PCB substrate 1, a first plastic package 2, a second plastic package 3, a pin 4, an electronic device 5, and a metal terminal 6. The length and width of the first plastic package 2 and the first plastic package 3 are consistent with the length and width of the PCB substrate 1. The metal terminal 6 of the product is arranged on one side of the PCB substrate 1, and the metal terminal 6 is arranged on the product boundary and on the cutting line of the product. After plastic packaging, a part of the metal terminal 6 is cut off by cutting, and one side of the metal terminal 6 is exposed on the side of the product. The part of the metal terminal 6 exposed on the side of the plastic package body serves as an electrical contact, and the product pin 4 and the electrical contact are soldered to form an electrical connection and a mechanical connection. There is a groove 8 under the metal terminal 6, and the groove 8 is filled with tin. The metal terminal 6 and the PCB substrate 1 are soldered together by tin. The tin 702 in the metal terminal groove, the tin 703 welded between the metal terminal and the PCB substrate, and the tin 701 welded between the pins form a whole, similar to a bolt structure, which increases the welding strength between the pin 4 and the metal terminal 6.

[0033] like Figure 4 The metal terminal 6 has no groove 8. After cutting, the only section exposed outside the second plastic package is the section of the metal terminal 6. The metal section is easily oxidized, and the welding strength between the oxidized metal section and tin will decrease.

[0034] From the above content, it can be seen that the utility model forms a whole through the tin welded between the metal terminal 6 and the PCB substrate 1, the tin 702 in the metal terminal groove 8 and the tin welded on the pin, forming a bolt-like structure, which increases the mechanical strength of the welding point between the pin and the product, thereby improving the product's anti-vibration performance.

[0035] The above are only preferred embodiments of the present invention. It should be pointed out that the above preferred embodiments should not be regarded as limitations of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. The protection scope of the present invention should be based on the scope defined by the claims.

Claims

1. A double-sided plastic-sealed power module, the double-sided plastic-sealed power module include: A PCB substrate, wherein electronic components are respectively welded on the upper surface and the lower surface of the PCB substrate; A first plastic package body, covering the lower surface of the PCB substrate; A second plastic package body, covering the upper surface of the PCB substrate; A metal terminal is arranged on the upper surface of the PCB substrate and is covered by the second plastic package, and one side of the metal terminal is exposed outside the second plastic package; The feature of the invention is that: a groove is provided on a surface of the metal terminal in contact with the PCB substrate, and the groove is filled with tin.

2. A double-sided plastic-sealed power module according to claim 1, Features: The metal terminal is made of copper or copper alloy.

3. The double-sided plastic-sealed power module according to claim 1, Features: The length and width of the first plastic package body, the PCB substrate and the second plastic package body are consistent.

4. The double-sided plastic-sealed power module according to claim 1, Features: The metal terminal is fixed on the PCB substrate by soldering.

5. The double-sided plastic-sealed power module according to claim 1, Features: One side of the metal terminal is exposed outside the second plastic package body and is formed by cutting the metal terminal and the second plastic package body.

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