Vehicle-mounted USB charging device

Abstract

The utility model discloses a vehicle-mounted USB charging device, which comprises a front shell, a rear shell connected with the front shell to form a containing cavity, a PCBA arranged in the containing cavity and a heat dissipation assembly matched with the PCBA, and is characterized in that the heat dissipation assembly comprises a heat dissipation sheet and a heat conduction silica gel pad, one end of the radiating fin is fixed on the front shell or the rear shell, the other end of the radiating fin penetrates through a gap between the front shell and the rear shell and is positioned on one side of a heat source in the PCBA, and the heat-conducting silica gel pad is positioned between the radiating fin and the heat source. The beneficial effects of the utility model are that: 1, the two ends of the radiating fin are respectively located inside and outside the accommodating cavity, so that heat generated by a chip in the PCBA can be conveniently conducted out of the shell, and the radiating effect is good; 2, the radiating fins are sheet metal parts, the structure is simple, and the manufacturing cost is low; and 3, mounting structures of the radiating fins are designed on the front and rear shells, so that positioning and mounting are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle-mounted USB equipment, and in particular relates to a vehicle-mounted USB charging device. Background Art

[0002] As more and more mobile devices such as mobile phones and tablets support high-power fast charging, existing cars are also equipped with on-board USB charging devices with fast charging functions to achieve fast charging of mobile devices through USB interfaces.

[0003] Since it is a high-power fast charge, it generates high heat during use, so a good heat dissipation design is one of the problems that need to be solved. In the prior art, CN214412320U discloses a car-mounted USB charger that is easy to dissipate heat, which is achieved by designing heat dissipation holes. Although this heat dissipation method has a simple structure, the heat dissipation effect is not good, especially the heat generated during use may not be dissipated from the heat dissipation holes in time, affecting the entire module. Another example is CN217159331U discloses a car-mounted USB charging device, which regards the heat sink as part of the entire device to achieve heat dissipation. Although this heat dissipation method has a good heat dissipation effect, it requires the use of metal materials and the design of the connection structure between the heat sink structure and other components, resulting in a complex structure and high cost. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a vehicle-mounted USB charging device. By designing a heat sink and an installation structure, the heat generated by the chip in the device is led out to the outside of the device to achieve heat dissipation. The utility model has a simple structure, low cost and good heat dissipation effect.

[0005] To solve the above technical problems, the present invention adopts a technical solution: an in-vehicle USB charging device, comprising a front housing, a rear housing connected to the front housing to form a receiving cavity, a PCBA disposed within the receiving cavity, and a heat dissipation assembly matched with the PCBA. The key feature is that the heat dissipation assembly includes a heat sink and a thermally conductive silicone pad. One end of the heat sink is fixed to the front housing or the rear housing, and the other end passes through the gap between the front and rear housings and is located on one side of a heat source in the PCBA. The thermally conductive silicone pad is located between the heat sink and the heat source.

[0006] Furthermore, a through groove is provided on the rear shell to form a gap between the front shell and the rear shell.

[0007] Furthermore, a limiting groove for limiting the heat sink is provided on the rear shell and located on one side of the through groove.

[0008] Furthermore, a positioning boss is provided in the limiting groove, and a positioning hole matched with the positioning boss is provided on the heat sink.

[0009] Furthermore, a heat receiving portion is provided on the heat sink, which is bent obliquely downward and then bent horizontally.

[0010] Furthermore, a first connecting hole is provided in the heat receiving part, and the heat receiving part is connected to the front shell by means of a first connecting screw that passes through the front shell and is threadedly connected to the heat receiving part.

[0011] Furthermore, a limiting portion is provided on the heat sink and is bent downward and located on the outside of the rear shell.

[0012] Furthermore, a second connecting hole is provided in the limiting portion, and the limiting portion is connected to the rear shell by means of a second connecting screw that passes through the second connecting hole and is threadedly connected to the rear shell.

[0013] Furthermore, a power input connector is provided on the PCBA.

[0014] Furthermore, a through hole matching the USB interface on the PCBA is provided on the front shell.

[0015] The beneficial effects of the present invention are as follows: 1. The two ends of the heat sink are respectively located inside and outside the accommodating cavity, which facilitates the conduction of heat generated by the chip in the PCBA to the outside of the shell, and has a good heat dissipation effect; 2. The heat sink is made of sheet metal, with a simple structure and low manufacturing cost; 3. The mounting structure of the heat sink is designed on the front and rear shells, which is convenient for positioning and installation.

[0016] The present invention will be described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the main view of the vehicle-mounted USB charging device of the utility model;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the vehicle-mounted USB charging device of the utility model;

[0019] Figure 3 This is a schematic diagram of the installation of the vehicle-mounted USB charging device of the utility model.

[0020] In the accompanying drawings, 1. front shell, 1-1. through hole, 2. rear shell, 2-1. through groove, 2-2. limiting groove, 2-3. positioning boss, 3. PCBA, 4. power input connector, 5. heat sink, 5-1. positioning hole, 5-2. heat receiving part, 5-3. limiting part, 5-4. first connecting hole, 5-5. second connecting hole, 6. thermal conductive silicone pad, 7. first connecting screw, 8. second connecting screw. DETAILED DESCRIPTION

[0021] See attached Figure 1-3The utility model provides a vehicle-mounted USB charging device, comprising a front shell 1, a rear shell 2 connected to the front shell 1 to form a receiving cavity, a PCBA3 arranged in the receiving cavity, and a heat dissipation component matching the PCBA3. The front shell 1 and the rear shell 2 are connected by a snap. A through hole 1-1 matching the USB interface on the PCBA3 is provided on the front shell 1. In this embodiment, the USB interface on the PCBA3 is a USB-C interface. A power input connector 4 is also fixed to the PCBA3 by screws. After the connection is completed, the power input connector 4 is electrically connected to the PCBA3 by welding to supply power when in use. Installation guide grooves for limiting the two sides of the PCBA3 are provided inside the front shell 1 and the rear shell 2. A through hole matching the PCBA3 is also provided on the rear shell 2.

[0022] The heat dissipation assembly includes a heat sink 5 and a thermally conductive silicone pad 6. One end of the heat sink 5 is fixed to the front shell 1 or rear shell 2, while the other end passes through the gap between the front shell 1 and rear shell 2 and is located on one side of the heat source in the PCBA 3. The thermally conductive silicone pad 6 is located between the heat sink 5 and the heat source. Positioning the ends of the heat sink 5 inside and outside the receiving cavity, respectively, effectively dissipates heat generated by the chips on the PCBA 3 during operation. Furthermore, heat can also be transferred outside the device through the gap between the front and rear shells. In this embodiment, the outer end of the heat sink 5 is fixed to the rear shell 2.

[0023] In order to facilitate one end of the heat sink 5 to enter the accommodating cavity, a through groove 2 - 1 is provided on the rear shell 2 to form a gap between the front shell 1 and the rear shell 2 .

[0024] A limiting groove 2-2 is provided on the rear housing 2 and on one side passing through the groove 2-1 for limiting the heat sink 5. A positioning boss 2-3 is provided in the limiting groove 2-2, and a positioning hole 5-1 is provided on the heat sink 5 to match the positioning boss 2-3.

[0025] A heat receiving portion 5 - 2 is provided on the heat sink 5 , which is bent downward and then horizontally. A thermal conductive silicone pad 6 is located between the heat receiving portion 5 - 2 and the chip on the PCBA 3 to transfer heat generated when the chip is working.

[0026] A first connecting hole 5 - 4 is provided in the heat receiving part 5 - 2 , and the heat receiving part 5 - 2 is connected to the front shell 1 by means of a first connecting screw 7 which passes through the front shell 1 and is threadedly connected to the heat receiving part 5 - 2 .

[0027] The heat sink 5 is provided with a downwardly bent stopper 5-3 located outside the rear housing 2. A second connection hole 5-5 is provided in the stopper 5-3. The stopper 5-3 is connected to the rear housing 2 via a second connection screw 8 that passes through the second connection hole 5-5 and is threadedly connected to the rear housing 2. The heat sink 5 is made of sheet metal, which simplifies the structure and reduces manufacturing costs.

[0028] The installation process of the device of the present invention is as follows: 1. First, fix the power input connector 4 on the PCBA3 and weld it to achieve electrical connection; 2. Stick the thermal conductive silicone pad 6 on the relevant chip on the PCBA3; 3. Insert the PCBA3 into the installation guide groove of the rear shell 2, and at the same time position the heat sink 5 in the limiting groove 2-2 of the rear shell 2. At this time, the heated end of the heat sink 5 is located on the thermal conductive silicone pad 6; 4. Insert the front end of the PCBA3 into the installation guide groove of the front shell 1, and then achieve connection through the snap-fit structure between the front and rear shells; 5. Install the first connecting screw 7 and the second connecting screw 8 to fix the two ends of the heat sink 5 to complete the installation of the entire device.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and not to limit it; although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solution of the utility model, they should all be included in the scope of the technical solution for protection of the utility model.

Claims

1. A vehicle-mounted USB charging device, comprising a front shell (1), a rear shell (2) connected to the front shell (1) to form a receiving cavity, a PCBA (3) disposed in the receiving cavity, and a heat dissipation assembly matched with the PCBA (3), characterized in that: The heat dissipation assembly comprises a heat sink (5) and a thermally conductive silicone pad (6), one end of the heat sink (5) is fixed to the front shell (1) or the rear shell (2), and the other end passes through the gap between the front shell (1) and the rear shell (2) and is located on one side of the heat source in the PCBA (3), and the thermally conductive silicone pad (6) is located between the heat sink (5) and the heat source; A through groove (2-1) is provided on the rear shell (2) to form a gap between the front shell (1) and the rear shell (2); A limiting groove (2-2) for limiting the heat sink (5) is provided on the rear shell (2) and located on one side of the through groove (2-1).

2. The in-vehicle USB charging device according to claim 1, characterized in that: A positioning boss (2-3) is provided in the limiting groove (2-2), and a positioning hole (5-1) matching the positioning boss (2-3) is provided on the heat sink (5).

3. The in-vehicle USB charging device according to claim 1, characterized in that: The heat sink (5) is provided with a heat receiving portion (5-2) that is bent downwardly and then bent horizontally.

4. The vehicle-mounted USB charging device according to claim 3, wherein: A first connecting hole (5-4) is provided in the heat receiving part (5-2), and the heat receiving part (5-2) is connected to the front shell (1) by means of a first connecting screw (7) that passes through the front shell (1) and is threadedly connected to the heat receiving part (5-2).

5. The vehicle-mounted USB charging device according to claim 1, wherein: A limiting portion (5-3) is provided on the heat sink (5) and is bent downward and located outside the rear shell (2).

6. The vehicle-mounted USB charging device according to claim 5, characterized in that: A second connection hole (5-5) is provided in the limiting portion (5-3), and the limiting portion (5-3) is connected to the rear housing (2) by means of a second connection screw (8) passing through the second connection hole (5-5) and threadedly connected to the rear housing (2).

7. The vehicle-mounted USB charging device according to any one of claims 1 to 6, characterized in that: A power input connector (4) is provided on the PCBA (3).

8. The vehicle-mounted USB charging device according to any one of claims 1 to 6, characterized in that: A through hole (1-1) matching the USB interface on the PCBA (3) is provided on the front shell (1).

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