Wireless charger

Abstract

A wireless charger includes a heat-conductive plastic cover, a circuit board, and a metal housing, wherein the circuit board is disposed in the metal housing, and a wind-guiding tunnel is formed between the heat-conductive plastic cover and the circuit board to dissipate heat generated by an electronic device disposed on the heat-conductive plastic cover for wireless charging.

Description

Technical Field

[0001] The present invention relates to a charger for charging an electronic device, and more particularly to a wireless charger. Background Art

[0002] With the increasing popularity of wireless chargers for handheld electronic devices such as mobile phones and in-vehicle electronic devices, however, when the temperature of a mobile phone being wirelessly charged reaches a specific temperature, the mobile phone will stop the high-wattage fast charging mode and start to decrease the temperature of the mobile phone to keep it below the specific temperature, which will increase the time for the mobile phone to be fully charged.

[0003] Therefore, the industry needs a better solution to solve the above problems. Summary of the Invention

[0004] An object of the present invention is to provide a wireless charger for charging an electronic device, wherein a wind guiding tunnel is formed between a heat-conducting plastic cover of the wireless charger and a circuit board to keep the temperature of the electronic device being charged not greater than 40°C to maintain high-wattage charging and reduce the time for the mobile phone to be fully charged.

[0005] An object of the present invention is to provide a structural design of a wireless charger with a wind guiding tunnel, which can effectively dissipate the heat generated by the electronic device being charged, so that the wireless charger maintains a high-wattage charging mode.

[0006] An embodiment of the present invention discloses a wireless charger, including: a heat-conducting plastic cover, including insulating and heat-conducting materials; at least one coil; a first circuit board; and a metal shell, wherein the at least one coil and the first circuit board are disposed inside the metal shell, and a wind guiding tunnel is formed between the heat-conducting plastic cover and the first circuit board for dissipating the heat generated by an electronic device disposed on the heat-conducting plastic cover for wireless charging.

[0007] In an embodiment, the wind guiding tunnel is formed between the heat-conducting plastic cover and the first circuit board to keep the temperature of the electronic device not greater than 40°C.

[0008] In an embodiment, the height of the wind guiding tunnel is between Imm and 3mm.

[0009] In an embodiment, a first groove is formed on an upper surface of the metal shell, and the at least one coil is disposed in the first groove.

[0010] In an embodiment, the at least one coil and the first circuit board are disposed in the first groove, and the first circuit board is disposed between the heat-conducting plastic cover and the at least one coil.

[0011] In one embodiment, the at least one coil includes a plurality of coils, and the plurality of coils are disposed in the first groove, wherein the plurality of coils are stacked into multiple layers for charging the electronic device.

[0012] In one embodiment, the heat-conductive plastic cover includes a plurality of bumps to increase the total area of heat dissipation.

[0013] In one embodiment, the bump has the shape of a sphere.

[0014] In one embodiment, the wireless charger further includes a fan, and the fan is located on one side of one side edge of the first circuit board under the heat-conductive plastic cover.

[0015] In one embodiment, the heat-conductive plastic cover includes a through hole or an open slot to allow air to flow into the air guide tunnel.

[0016] In one embodiment, a magnetic sheet is provided under the at least one coil, and the at least one coil and the magnetic sheet are tightly combined with the metal housing.

[0017] In one embodiment, the magnetic sheet includes at least one of the following: MnZn, NiZn, ferrite, and nanocrystalline.

[0018] In one embodiment, each of the at least one coil is made of enameled wire.

[0019] In one embodiment, the heat-conductive plastic cover includes a polymer integrated with at least one of the following high thermal conductivity oxide particles: graphite, alumina, and magnesia.

[0020] In one embodiment, the thermal conductivity coefficient K of the heat-conductive plastic cover ranges from 0.1 to 6 W / (m·K).

[0021] An embodiment of the present invention discloses a wireless charger, including: a heat-conductive plastic cover including an insulating and heat-conductive material; at least one coil; a first circuit board; and a metal housing, wherein the first circuit board and the metal housing form an upper surface, and an air guide tunnel is formed between the heat-conductive plastic cover and the upper surface for dissipating heat generated by an electronic device disposed on the heat-conductive plastic cover for wireless charging.

[0022] In one embodiment, the height of the air guide tunnel is between 1 mm and 3 mm.

[0023] To make the above and other features and advantages of the present invention more obvious and understandable, specific embodiments are hereinafter given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0024] The accompanying drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention.

[0025] Figure 1A Exploded top view of a wireless charger according to an embodiment of the present invention.

[0026] Figure 1B Exploded bottom view of a wireless charger according to an embodiment of the present invention.

[0027] Figure 1C Side view of a wireless charger according to an embodiment of the present invention.

[0028] Figure 1D As shown in Figure 1C Side view of the wireless charger in

[0029] Figure 1E As shown in Figure 1C Enlarged view of a region of the wireless charger in

[0030] Figure 2 Graph showing the relationship between different gap sizes of the air guide tunnel and the charging efficiency of a wireless charger according to an embodiment of the present invention.

[0031] Figure 3 Graph comparing the temperatures of different components when wirelessly charging an electronic device using the present invention or a conventional method.

[0032] Description of reference numerals: 100 - wireless charger; 101 - thermally conductive plastic cover; 102 - first circuit board; 103 - coil; 104 - metal housing; 130 - air guide tunnel; 101d - blocking body; H - height; 101R - groove; 101a - bump; 107 - fan; 101b - through hole or open slot; 101c - air reflector; 104RB - second groove; 105 - second circuit board; 210 - air; 106 - metal cover plate. Detailed Description of the Invention

[0033] Figure 1A Exploded top view of a wireless charger 100 according to an embodiment of the present invention. Figure 1B Exploded bottom view of a wireless charger 100 according to an embodiment of the present invention. Figure 1C Side view of a wireless charger 100 according to an embodiment of the present invention, Figure 1D Side view of the wireless charger 100 of the present invention. Figure 1E Is Figure 1C An enlarged view of a region of the wireless charger 100 in Figure 1A - 1E, wherein the wireless charger 100 includes: a heat-conducting plastic cover 101, which includes an insulating heat-conducting material; at least one coil 103; a first circuit board 102; a metal housing 104, wherein the at least one coil 103 and the first circuit board 102 are disposed in the metal housing 104, wherein the first circuit board 102 is disposed between the heat-conducting plastic cover 101 and the at least one coil 103, and a wind guiding tunnel 130 is formed between the heat-conducting plastic cover 101 and the first circuit board 102 for dissipating heat generated by an electronic device disposed on the heat-conducting plastic cover 101 for wireless charging.

[0034] In one embodiment, the wind guiding tunnel 130 is formed between the heat-conducting plastic cover 101 and the first circuit board 102 for keeping the temperature of the electronic device being wirelessly charged not greater than 40 °C so that the time for high-wattage charging can be longer.

[0035] In one embodiment, as Figure 1E shown, a baffle 101d is disposed at one end of the wind guiding tunnel 130 to prevent water from entering the wind guiding tunnel 130.

[0036] In one embodiment, as Figure 1E shown, the height H of the wind guiding tunnel 130 is between 1 mm and 3 mm.

[0037] In one embodiment, as Figure 1A shown, a groove 101R is formed on the upper surface of the heat-conducting plastic cover 101, and the electronic device for wireless charging can be disposed in the groove 101R.

[0038] In one embodiment, as Figure 1A shown, a first groove 104R is formed on the upper surface of the metal housing 104, and the at least one coil 103 is disposed in the first groove 104R.

[0039] In one embodiment, as Figure 1A shown, a first groove 104R is formed on the upper surface of the metal housing 104, and the at least one coil 103 and the first circuit board 102 are disposed in the first groove 104R.

[0040] In one embodiment, the at least one coil 103 includes a plurality of coils, and the plurality of coils are stacked into multiple layers for wirelessly charging the electronic device.

[0041] In one embodiment, as Figure 1B [[ID=3​​In one embodiment, the protruding bump 101a has a spherical shape.

[0043] In one embodiment, as Figure 1C shown, a fan 107 is located below the thermally conductive plastic cover 101 and on one side of one side edge of the first circuit board 102, so that air 210 flows into the air guiding tunnel 130.

[0044] In one embodiment, as Figure 1E shown, the thermally conductive plastic cover 101 includes a through hole or an opening slot 101b to allow air 210 to flow into the air guiding tunnel 130.

[0045] In one embodiment, as Figure 1C shown, a plurality of air reflectors 101c are provided on the lower surface of the thermally conductive plastic cover 101 above the fan 107, so that the air 210 flowing into the air guiding tunnel 130 is reflected to the outside of the wireless charger 100 through the position 220. By doing so, an electronic device such as a mobile phone can be in a high-wattage charging mode by using heat conduction and heat convection.

[0046] In one embodiment, a magnetic sheet is provided below the at least one coil 103, wherein the at least one coil 103 and the magnetic sheet are closely adhered to the metal shell 104.

[0047] In one embodiment, each coil in the at least one coil 103 is made of enameled wire.

[0048] In one embodiment, each coil in the at least one coil 103 is made of a wire including a self-adhesive layer.

[0049] In one embodiment, the magnetic sheet includes at least one of the materials: MnZn, NiZn, ferrite, and nanocrystalline.

[0050] In one embodiment, the magnetic sheet is made by a sintering or ceramic injection molding method.

[0051] In one embodiment, the metal shell 104 includes metal. [[ID=�5]]

[0052] In one embodiment, the metal shell 104 includes plastic.

[0053] In one embodiment, the metal shell 104 is made by stamping a metal sheet, die casting, or injection molding.

[0054] In one embodiment, the first circuit board 102 includes a PCB board, and at least one of the following components is provided on the PCB board: NFC, NTC, 5G antenna + FAKRA connector, EMI shielding pattern.

[0055] In one embodiment, the thermally conductive plastic cover 101 includes a high thermally conductive oxide particle, such as a polymer including at least one of graphite, alumina or magnesia.

[0056] In one embodiment, the thermally conductive plastic cover 101 includes a high thermally conductive oxide particle, such as a polymer including graphite combined with alumina.

[0057] In one embodiment, the thermally conductive plastic cover 101 includes a high thermally conductive oxide particle, such as a polymer including graphite combined with magnesia.

[0058] In one embodiment, the thermally conductive plastic cover 101 includes a high thermally conductive oxide particle, such as a polymer including graphite, alumina or magnesia combined.

[0059] In one embodiment, the thermally conductive plastic cover 101 includes a high thermally conductive oxide particle, such as a polymer including graphite, alumina and magnesia combined.

[0060] In one embodiment, the thermal conductivity K of the thermally conductive plastic cover 101 is in the range of 0.1 to 6 W / (m·K).

[0061] In one embodiment, the material and formulation design of the thermally conductive plastic cover 101 do not affect magnetic induction and do not affect the wireless charging function.

[0062] In one embodiment, as Figure 1A and Figure 1B shown, the metal housing 104 includes a metal plate, wherein a first groove 104R is formed on the upper side of the metal plate of the metal housing 104, wherein a second groove 104RB is formed on the lower side of the metal plate, and wherein a second circuit board 105 is disposed in a second groove 104RB of the metal housing 104.

[0063] In one embodiment, as Figure 1C shown, an air reflector 101c is disposed on the lower surface of the thermally conductive plastic cover 101 above the fan 107.

[0064] In one embodiment, the second circuit board 105 includes a heat generating element of the wireless charger 100 that conducts heat to the air reflector 101c through a structural design and a thermal pad, as Figure 1C shown.

[0065] In one embodiment, a part of the metal shell 104 is disposed below the second circuit board 105 to shield the second circuit board 105.

[0066] In one embodiment, as Figure 1A and Figure 1BAs shown, a lower cover plate, such as a metal cover plate 106, is provided below the second circuit board 105.

[0067] In one embodiment, the fan 107 can be selected by simulating the air guide tunnel 130. For example, after obtaining the air flow required to keep the mobile phone below 40°C and knowing the pressure drop, the impedance curve and the fan performance curve (PQ curve) can be used to find a fan design that meets the overall noise operating point.

[0068] Figure 2 It is a diagram showing the relationship between the different gap sizes of the air guide tunnel 130 and the charging efficiency of wireless charging according to an embodiment of the present invention. When a height H of the air guide tunnel 130 is 1 mm, the charging efficiency is 68.10; when a height H of the air guide tunnel 130 is 2 mm, the charging efficiency is 68.33; when a height H of the air guide tunnel 130 is 66.65, the charging efficiency is 66.65, as Figure 1E shown.

[0069] As Figure 2 shown, when a height H of the air guide tunnel 130 is 1 mm, the total loss is 12.76; when the height H of the air guide tunnel 130 is 2 mm, the total loss is 12.67; when a height H of the air guide tunnel 130 is 3 mm, the total loss is 13.34, as Figure 1E shown.

[0070] Figure 3 It is a chart comparing the temperatures of different components when wirelessly charging an electronic device using the present invention or a traditional method. The temperature of the electronic device wirelessly charged using the present invention is 38.95°C, while the temperature of the electronic device wirelessly charged using the traditional method is 69.74°C. The temperature of the heat-conducting plastic cover of the wireless charger using the present invention is 38.11°C, and the temperature of the plastic cover using the traditional method is 67.26°C. In this way, the present invention can keep the temperature of the wirelessly charged electronic device not higher than 40°C to maintain high-power charging for a longer time.

[0071] As Figure 3 shown, compared with the temperatures of other components using the traditional method, the temperatures of other components using the present invention are also reduced.

[0072] Although the present invention has been described with reference to the above embodiments, it is obvious to those of ordinary skill in the art that the described embodiments can be modified without departing from the spirit of the present invention. Therefore, the scope of the present invention will be defined by the claims rather than by the detailed description above.

Claims

1. A wireless charger, characterized in that, include: A thermally conductive plastic cover, including an insulating and thermally conductive material; At least one coil; First circuit board; as well as A metal housing, wherein at least one coil and the first circuit board are disposed within the metal housing, wherein a ventilation tunnel is formed between the thermally conductive plastic cover and the first circuit board, and the ventilation tunnel is formed solely by the thermally conductive plastic cover and the first circuit board, for dissipating heat generated by an electronic device that can be disposed on the thermally conductive plastic cover for wireless charging; the thermally conductive plastic cover includes a through hole or an opening slot to allow air to flow into the ventilation tunnel; A fan, wherein the fan is located on one side of the first circuit board below the thermally conductive plastic cover, so that air is drawn into the air duct by the fan.

2. The wireless charger as described in claim 1, characterized in that, The air duct is formed between the thermally conductive plastic cover and the first circuit board to keep the temperature of the electronic device no higher than 40°C.

3. The wireless charger as described in claim 1, characterized in that, The height of the ventilation tunnel is between 1 mm and 3 mm.

4. The wireless charger as described in claim 1, characterized in that, A first groove is formed on an upper surface of the metal casing, wherein at least one coil is disposed in the first groove.

5. The wireless charger as described in claim 4, characterized in that, The at least one coil and the first circuit board are disposed within the first groove, wherein the first circuit board is disposed between the thermally conductive plastic cover and the at least one coil.

6. The wireless charger as described in claim 4, characterized in that, The at least one coil includes a plurality of coils disposed in the first groove, wherein the plurality of coils are stacked in multiple layers for charging the electronic device.

7. The wireless charger as described in claim 1, characterized in that, The lower surface of the thermally conductive plastic cover includes multiple protrusions to increase the total heat dissipation area.

8. The wireless charger as described in claim 7, characterized in that, The bump has a hemispherical shape.

9. The wireless charger as described in claim 1, characterized in that, A magnetic sheet is provided below the at least one coil, and the at least one coil and the magnetic sheet are tightly connected to the metal shell.

10. The wireless charger as described in claim 9, characterized in that, The magnetic sheet comprises at least one of the following materials: MnZn, NiZn, ferrite, and nanocrystals.

11. The wireless charger as described in claim 1, characterized in that, Each of the at least one coil is made of enameled wire.

12. The wireless charger as described in claim 1, characterized in that, The thermally conductive plastic cover comprises at least one of the following polymers: graphite, aluminum oxide, and magnesium oxide.

13. The wireless charger as described in claim 1, characterized in that, The thermal conductivity K of the thermally conductive plastic cover ranges from 0.1 to 6 W / (m·K).

14. A wireless charger, characterized in that, include: A thermally conductive plastic cover, including an insulating and thermally conductive material; At least one coil; First circuit board; as well as A metal casing, wherein a first circuit board forms an upper surface with the metal casing, wherein a thermally conductive plastic cover forms an air tunnel between the upper surface and the air tunnel is formed only by the thermally conductive plastic cover, the metal casing and the first circuit board, for dissipating heat generated by an electronic device that can be disposed on the thermally conductive plastic cover for wireless charging.

15. The wireless charger as described in claim 14, characterized in that, The height of the ventilation tunnel is between 1 mm and 3 mm.

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