A wireless charging device with active heat dissipation function

Abstract

The utility model discloses a wireless charging device with active heat dissipation function, including a shell, a circuit board, a wireless charging module, a cooling sheet, a cooling guide sheet, a fan and a radiator. The wireless charging module, the cooling sheet and the fan are respectively connected to the circuit board, the cooling sheet is connected to the wireless charging module, the top surface of the cooling guide sheet is connected to the bottom surface of the coil of the wireless charging module, and the bottom surface of the cooling guide sheet is connected to the top surface of the cooling sheet; an insulating spacer is arranged on the bottom surface of the circuit board, and the circuit board and the radiator are separated by the insulating spacer. In this way, the heat of the coil and the cold of the cooling sheet can be exchanged in time through the cooling guide sheet, so as to achieve a better cooling and heat dissipation effect for the wireless charging module, and at the same time, it can prevent the cooling sheet from generating obvious condensed water; and an insulating spacer is arranged between the circuit board and the radiator, so as to separate the heat of the radiator from the circuit board, thereby protecting the electronic components and improving the heat dissipation efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless charging devices, and in particular to a wireless charging device with an active heat dissipation function. Background Art

[0002] Since wireless charging is more convenient to use, it is becoming more and more popular. The current wireless charging device usually includes a housing, a circuit board and a wireless charging module. The circuit board and the wireless charging module are arranged in the housing. The wireless charging module is connected to the circuit board to obtain power and realize control. A circle of magnets is arranged around the coil of the wireless charging module. The position of the housing aligned with the wireless charging module is the charging area. When in use, the mobile phone (or other electronic products) can be charged by lying flat on the charging area. Traditional wireless charging has a large heat generation due to the IC module on the wireless charging module and the circuit board. The existing wireless charging usually only has ventilation holes for passive heat dissipation, which makes the wireless charging easy to heat up when in use, and has a significant impact on the charging rate. For this reason, people add fans, semiconductor cooling sheets, radiators and other components to the wireless charger to achieve active heat dissipation function, such as a car wireless charger disclosed in patent CN214707263U. However, such wireless chargers currently have the following problems: first, when a large amount of cold energy accumulates on the cold surface of the cooling plate, condensed water will be generated, which may damage the electronic components inside the charger; second, since the temperature of the radiator surface is high and the circuit board is close to the radiator, the high temperature of the radiator is likely to damage the electronic components on the circuit board. In addition, the structural design of the radiator is not reasonable, which not only affects the ventilation efficiency and heat dissipation effect, but also increases the noise. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a wireless charging device with active heat dissipation function, which has a more reasonable structural design, better heat dissipation effect, can prevent the generation of condensed water, can protect electronic components, and has lower noise.

[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme: a wireless charging device with active heat dissipation function, comprising a shell and a circuit board, a wireless charging module group, a cooling sheet, a fan and a radiator installed in the shell, the wireless charging module group, the cooling sheet and the fan are respectively connected to the circuit board, the cooling sheet is connected to the wireless charging module group, and the fan is connected to the radiator; a charging area is formed on the shell at a position aligned with the front of the wireless charging module group, characterized in that: it also includes a cooling sheet, the top surface of the cooling sheet is connected to the bottom surface of the coil of the wireless charging module group, and the bottom surface of the cooling sheet is connected to the top surface of the cooling sheet; an insulating isolation sheet is arranged on the bottom surface of the circuit board, and the circuit board and the radiator are separated by the insulating isolation sheet.

[0005] Furthermore, the top surface of the cooling plate is connected to the bottom surface of the coil of the wireless charging module through thermal grease, and the bottom surface of the cooling plate is connected to the top surface of the cooling plate through thermal grease to form a heat exchange structure between the coil and the cooling plate.

[0006] Furthermore, the cooling plate is made of heat-conducting material, and the area of ​​the cooling plate is larger than the coil area of ​​the wireless charging module group.

[0007] Preferably, the cooling plate is made of materials such as ceramic, silica gel or glass.

[0008] Furthermore, the insulating spacer is made of Mylar sheet, the upper surface of which contacts the bottom surface of the circuit board, and the bottom surface of the insulating spacer contacts the upper surface of the heat sink.

[0009] Furthermore, a heat-conducting block protruding upward is provided on the top of the heat sink, and the heat-conducting block passes through the insulating isolation sheet and the circuit board and contacts the bottom surface of the cooling sheet.

[0010] Furthermore, the radiator includes a heat conducting plate and heat fins, a plurality of heat fins are arranged in a ring shape at uniform intervals on the edge of the heat conducting plate and extend downward, and a fan is installed in the space formed by the heat dissipation fins; the top end of the inner edge of each heat dissipation fin is connected to the edge of the heat conducting plate so that the upper and lower ends of the heat dissipation fins are both suspended; the gap between adjacent heat dissipation fins forms an air outlet channel, and the inner and outer sides and the upper and lower ends of the air outlet channel are all hollow structures; the heat conducting block is arranged on the top surface of the heat conducting plate, and a plurality of fixing feet are also arranged on the radiator, and the fixing feet are formed by connecting two adjacent heat dissipation fins through an arc portion; the entire radiator is an integrated structure, and is made of an integrally formed hot-extruded profile.

[0011] Furthermore, each heat dissipation fin is an arc-shaped structure, and the arc bending direction of the heat dissipation fin is opposite to the rotation direction of the fan; each heat dissipation fin has a tangent that coincides with the rotating shaft of the fan.

[0012] Furthermore, the shell includes a bottom shell, an upper shell and a surface cover. The radiator is assembled and fixed to the bottom shell and the upper shell respectively by screws passing through its fixing feet, and the wireless charging module is installed in the upper shell; the surface cover is made of heat-conductive material, which is fixed on the upper shell to cover the wireless charging module; the bottom shell is a hollow structure, and a plurality of air inlets are arranged at its bottom, and air outlets are arranged on its side, the air inlets are opposite to the fan, and the air outlets are opposite to the air outlet channel of the radiator; the bottom of the bottom shell has a structure for connecting a vehicle-mounted bracket.

[0013] Furthermore, a circle of light guide ring is embedded in the top of the bottom shell, and the upper surface of the light guide ring is exposed; a circle of decorative ring is arranged on the outer side of the upper part of the bottom shell, and the light guide ring is clamped by the decorative ring; the decorative ring is made of aluminum alloy, and has both heat dissipation and decorative effects.

[0014] The utility model arranges a cooling plate between the refrigeration plate and the coil of the wireless charging module group, and the heat of the coil and the cold of the refrigeration plate can be exchanged in time through the cooling plate, so as to achieve a better cooling and heat dissipation effect for the wireless charging module group, and at the same time can prevent the refrigeration plate from generating obvious condensed water; and an insulating isolation plate is arranged between the circuit board and the radiator, which can isolate the heat of the radiator from the circuit board, thereby protecting the electronic components and improving the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the overall structure diagram of the utility model;

[0016] Figure 2 This is a cross-sectional structural diagram of the utility model;

[0017] Figure 3 This is the exploded structure diagram of the utility model;

[0018] Figure 4 This is an exploded structural diagram of the utility model from another angle;

[0019] Figure 5 This is the structural diagram of the radiator;

[0020] Figure 6 It is a plane schematic diagram of the matching state of the radiator and the fan;

[0021] Figure 7 This is a structural diagram of the utility model after being combined with a vehicle-mounted bracket.

[0022] In the figure, 11 is the bottom shell, 12 is the upper shell, 13 is the surface cover, 14 is the air inlet, 15 is the air outlet, 21 is the coil, 22 is the magnet, 31 is the cooling plate, 32 is the cooling fin, 4 is the fan, 5 is the radiator, 51 is the heat conduction plate, 52 is the heat dissipation fin, 53 is the fixing foot, 54 is the air outlet channel, 55 is the heat conduction block, 6 is the circuit board, 61 is the power port, 7 is the insulating spacer, 8 is the decorative ring, 9 is the light guide ring, and 10 is the vehicle bracket. DETAILED DESCRIPTION

[0023] In this embodiment, refer to Figure 1-Figure 5The wireless charging device with active heat dissipation function includes a shell and a circuit board 6, a wireless charging module, a (semiconductor) cooling sheet 31, a fan 4 and a radiator 5 installed in the shell. The wireless charging module, the cooling sheet 3 and the fan 4 are respectively connected to the circuit board 6, the cooling sheet 6 is connected to the wireless charging module, and the fan 4 is connected to the radiator 5; a charging area is formed on the shell at a position aligned with the front of the wireless charging module, for placing a mobile phone for charging; the circuit board 6 is provided with an electrical port 61 for connecting a power source, such as a TYPE-C interface; it also includes a cooling sheet 32, the top surface of the cooling sheet 32 ​​is connected to the bottom surface of the coil 21 of the wireless charging module, and the bottom surface of the cooling sheet 32 ​​is connected to the top surface of the cooling sheet 31. The cooling sheet 32 ​​can reduce the temperature difference between the cooling sheet 31 and the coil 21, thereby preventing the cooling sheet 31 from generating condensed water; an insulating isolation sheet 7 is provided on the bottom surface of the circuit board 6, and the circuit board 6 is separated from the radiator 5 by the insulating isolation sheet 7 to prevent the heat of the radiator 5 from being transferred to the circuit board 6.

[0024] The top surface of the cooling plate 32 is connected to the bottom surface of the coil 21 through thermal grease, and the bottom surface of the cooling plate 32 is connected to the top surface of the cooling plate 31 through thermal grease to form a heat exchange structure between the coil 21 and the cooling plate 31, which can improve the heat exchange efficiency.

[0025] The cooling plate 32 is made of heat-conducting material, and the area of ​​the cooling plate 32 is larger than the area of ​​the coil 21. Generally speaking, when the temperature difference exceeds 4°C, condensation water is easily generated. According to the rough estimation formula: normal temperature-[(cooling capacity of cooling plate)-(coil + 25% of the heat power of the main control IC converted into heat + heat generated by the mobile phone + heat of the receiving coil)]≦4°C, therefore, by expanding the cold surface heat exchange area of ​​the cooling plate 31 to disperse the large amount of cold energy accumulated on the cold surface of the cooling plate 31, the generation of condensation water can be prevented.

[0026] The cooling plate 32 is made of ceramic, silica gel, glass or other materials.

[0027] The insulating spacer 7 is made of Mylar sheet, and its upper surface is in contact with the bottom surface of the circuit board 6 , and the bottom surface of the insulating spacer 7 is in contact with the upper surface of the heat sink 5 .

[0028] A heat-conducting block 55 protruding upward is provided on the top of the heat sink 5 . The heat-conducting block 55 passes through the insulating spacer 7 and the circuit board 6 and contacts the bottom surface of the cooling plate 31 .

[0029] The radiator 5 includes a heat conducting plate 52 and heat dissipation fins 51. A plurality of heat dissipation fins 51 are arranged in a ring shape at uniform intervals on the edge of the heat conducting plate 52 and extend downward. The fan 4 is installed in the space formed by the heat dissipation fins 51. The top of the inner edge of each heat dissipation fin 51 is connected to the edge of the heat conducting plate 52, so that the upper and lower ends of the heat dissipation fins 51 are both suspended. The gap between adjacent heat dissipation fins 51 forms an air outlet channel 54. The inner and outer sides and the upper and lower ends of the air outlet channel 54 are hollow structures, which can connect the upper and lower spaces, promote air flow, and further improve the heat dissipation effect. The heat conducting block 55 is arranged on the top surface of the heat conducting plate 52. The radiator 5 is also provided with a plurality of fixed feet 53, which are formed by connecting two adjacent heat dissipation fins 51 through an arc portion. The entire radiator 5 is an integrated structure, which is made of an integrally formed hot extruded profile. Compared with die casting and cold forging, it is not only more efficient, but also has less material waste and lower cost, and the heat dissipation fins 51 are smoother and more regular.

[0030] like Figure 6 As shown, each heat dissipation fin 51 is an arc-shaped structure, and the arc bending direction of the heat dissipation fin 51 is opposite to the rotation direction of the fan 4. This structure can increase the heat exchange area and improve the heat dissipation efficiency. The air outlet channel 54 is consistent with the direction of rotation of the fan 4 and the direction of air exchange and escape, which is conducive to reducing wind resistance, reducing noise, and bringing better silent effect; each heat dissipation fin 51 has a tangent that coincides with the rotating shaft of the fan 4, so that the air is diverted on the edge of the heat dissipation fin 51, thereby reducing turbulence, reducing noise, and improving heat dissipation efficiency. In addition, the above-mentioned structure of the heat dissipation fin 51 is conducive to dissipating the heat generated per unit time into the air per unit time at normal temperature (25 degrees) to achieve dynamic balance.

[0031] The shell includes a bottom shell 11, an upper shell 12 and a surface cover 13. The radiator 5 is respectively assembled and fixed with the bottom shell 11 and the upper shell 12 by screws passing through its fixing feet 53, and the wireless charging module is installed in the upper shell 12; the surface cover 13 is made of heat-conducting materials, such as ceramics, silicone, glass, etc., which can disperse the cold and take away the heat of the mobile phone over a large area to achieve a cooling effect. The surface cover 13 is fixed on the upper shell 12 to cover the coil 21 of the wireless charging module and the magnet 22 surrounding the coil 21; the bottom shell 11 is a hollow structure, and a plurality of air inlets 14 are arranged at its bottom, and an air outlet 15 is arranged on its side. The air inlet 14 is opposite to the fan 4, and the air outlet 15 is opposite to the air outlet channel of the radiator 5. The cross-sectional area of ​​the air outlet 15 is equal to that of the air inlet 14, thereby ensuring the best heat exchange air intake and air outlet. External cold air is drawn in from the air inlet 14 by the fan 4 and then discharged from the air outlet 15 through the air outlet channel 54, thus achieving an air cooling effect.

[0032] The bottom of the bottom shell 11 has a structure for connecting the vehicle bracket 10, such as screw connection, threaded connection, snap connection, plug-in fixation, etc., so that it can be conveniently used in the car, such as Figure 7 After the vehicle bracket 10 is removed, the device can be used alone, for example, to charge the device while playing games.

[0033] A circle of light guide ring 9 is embedded in the top of the bottom shell 11. The light guide ring 9 can be made of materials such as PC and its upper surface is exposed. An LED light can be arranged in the bottom shell 11. The light shines on the light guide ring 9 to indicate the charging status and have the effect of beautifying the product with light. A circle of decorative ring 8 is arranged on the outer side of the upper part of the bottom shell 11. The light guide ring 8 is clamped by the decorative ring 9. The decorative ring 9 is made of aluminum alloy and has both heat dissipation and decorative effects.

[0034] The performance indicators of the cooling plate used in this embodiment are shown in the following table:

[0035]

[0036] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. A wireless charging device with active heat dissipation function, comprising a housing and a circuit board, a wireless charging module, a cooling sheet, a fan and a radiator installed in the housing, wherein the wireless charging module, the cooling sheet and the fan are respectively connected to the circuit board, the cooling sheet is connected to the wireless charging module, and the fan is connected to the radiator; a charging area is formed on the housing at a position aligned with the front of the wireless charging module, characterized in that: It also includes a cooling plate, the top surface of which is connected to the bottom surface of the coil of the wireless charging module, and the bottom surface of which is connected to the top surface of the cooling plate; an insulating spacer is arranged on the bottom surface of the circuit board, and the circuit board and the radiator are separated by the insulating spacer.

2. The wireless charging device with active heat dissipation function according to claim 1, characterized in that: The top surface of the cooling plate is connected to the bottom surface of the coil of the wireless charging module through thermal grease, and the bottom surface of the cooling plate is connected to the top surface of the cooling plate through thermal grease to form a heat exchange structure between the coil and the cooling plate.

3. The wireless charging device with active heat dissipation function according to claim 2, characterized in that: The cooling plate is made of heat-conducting material, and the area of ​​the cooling plate is larger than the coil area of ​​the wireless charging module group.

4. The wireless charging device with active heat dissipation function according to claim 3, characterized in that: The cooling plate is made of ceramic, silica gel or glass.

5. The wireless charging device with active heat dissipation function according to claim 1, characterized in that: The insulating spacer is made of Mylar sheet, the upper surface of which contacts the bottom surface of the circuit board, and the bottom surface of the insulating spacer contacts the upper surface of the radiator.

6. The wireless charging device with active heat dissipation function according to claim 1, characterized in that: A heat-conducting block protruding upward is arranged on the top of the radiator, and the heat-conducting block passes through the insulating isolation sheet and the circuit board and contacts the bottom surface of the cooling sheet.

7. The wireless charging device with active heat dissipation function according to claim 6, characterized in that: The radiator includes a heat conducting plate and heat dissipation fins. A plurality of heat dissipation fins are arranged in a ring shape at uniform intervals on the edge of the heat conducting plate and extend downward. A fan is installed in the space formed by the heat dissipation fins. The top end of the inner edge of each heat dissipation fin is connected to the edge of the heat conducting plate so that the upper and lower ends of the heat dissipation fins are both suspended. The gap between adjacent heat dissipation fins forms an air outlet channel, and the inner and outer sides and the upper and lower ends of the air outlet channel are all hollow structures. The heat conducting block is arranged on the top surface of the heat conducting plate, and a plurality of fixing feet are also arranged on the radiator, and the fixing feet are formed by connecting two adjacent heat dissipation fins through an arc portion. The entire radiator is an integrated structure and is made of an integrally formed hot extruded profile.

8. The wireless charging device with active heat dissipation function according to claim 7, characterized in that: Each heat dissipation fin is an arc-shaped structure, and the arc bending direction of the heat dissipation fin is opposite to the rotation direction of the fan; each heat dissipation fin has a tangent that coincides with the rotating shaft of the fan.

9. The wireless charging device with active heat dissipation function according to claim 7, characterized in that: The shell includes a bottom shell, an upper shell and a surface cover. The radiator is assembled and fixed to the bottom shell and the upper shell respectively by screws passing through its fixing feet, and the wireless charging module is installed in the upper shell; the surface cover is made of heat-conductive material, which is fixed on the upper shell to cover the wireless charging module; the bottom shell is a hollow structure, and a plurality of air inlets are arranged at its bottom, and air outlets are arranged on its side, the air inlets are opposite to the fan, and the air outlets are opposite to the air outlet channel of the radiator; the bottom of the bottom shell has a structure for connecting the vehicle-mounted bracket.

10. The wireless charging device with active heat dissipation function according to claim 9, characterized in that: A circle of light guide ring is embedded on the top of the bottom shell, and the upper surface of the light guide ring is exposed; a circle of decorative ring is arranged on the outer side of the upper part of the bottom shell, and the light guide ring is clamped by the decorative ring; the decorative ring is made of aluminum alloy.

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