WIRELESS CHARGING DEVICE

This application provides a wireless charging device for charging an electronic device. The wireless charging device includes a housing, a transmit coil, and a heat dissipation assembly. The housing is provided with a panel. The transmit coil is disposed in the housing, and is located on a side of the panel. The housing is configured to place an electronic device to be charged, and the electronic device is at a distance from the panel. The housing is provided with an air vent located under the panel. The heat dissipation assembly includes a semiconductor refrigeration chip and a fan. The semiconductor refrigeration chip includes a cold end and a hot end. The hot end is disposed on the housing. The fan is disposed on the housing, and air blown by the fan passes through the cold end and is blown out from the air vent.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 202123159198.2, filed with the China National Intellectual Property Administration on Dec. 14, 2021 and entitled “WIRELESS CHARGING DEVICE”, which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

Embodiments of this application relate to the field of wireless charging technologies, and in particular, to a wireless charging device.

BACKGROUND

In a wireless charging process of an electronic device, a large amount of heat is generated by the electronic device. If charging time is relatively long, the heat may cause damage to both the electronic device and a wireless charging device. An existing low-power wireless charging device is not provided with a heat dissipation structure, or dissipates heat of the electronic device by being in contact with a heat sink; and a high-power wireless charging device dissipates heat of the electronic device by using a fan. However, a heat dissipation effect is not ideal, and needs to be further optimized.

SUMMARY

In view of this, this application provides a wireless charging device with a good heat dissipation effect.

According to a first aspect, this application provides a wireless charging device for charging an electronic device. The wireless charging device includes a housing, a transmit coil, and a heat dissipation assembly. The housing is provided with a panel. The transmit coil is disposed in the housing, and is located on a side of the panel. The housing is configured to place an electronic device to be charged, and the electronic device is at a distance from the panel. The housing is provided with an air vent located under the panel. The heat dissipation assembly includes a semiconductor refrigeration chip and a fan. The semiconductor refrigeration chip includes a cold end and a hot end. The hot end is disposed on the housing. The fan is disposed on the housing, and air blown by the fan passes through the cold end and is blown out from the air vent.

The air blown by the fan passes through the cold end and a temperature of the air is reduced, and the air passes between the panel and the electronic device to reduce a temperature of the electronic device.

In a possible implementation, the heat dissipation assembly further includes another fan and a first thermally conductive member. The first thermally conductive member is disposed on a side that is of the transmit coil and that is away from the panel; and the another fan is disposed on the housing, and blows air to the first thermally conductive member.

Apparently, in the foregoing implementation, the air blown by the another fan can be blown to the first thermally conductive member, so as to reduce a temperature of the first thermally conductive member, and then reduce a temperature of the transmit coil.

In a possible implementation, the first thermally conductive member is obliquely disposed above the another fan, and the another fan blows air from an upper side.

Apparently, in the foregoing implementation, the first thermally conductive member is obliquely disposed above the fan, to increase projection of the first thermally conductive member on the fan, so that the air blown by the fan may be directly blown to a larger area of the first thermally conductive member, thereby improving efficiency of reducing the temperature of the first thermally conductive member.

In a possible implementation, the heat dissipation assembly further includes another semiconductor refrigeration chip, and the another semiconductor refrigeration chip is disposed between the transmit coil and the first thermally conductive member, and the cold end faces the transmit coil and the hot end faces the first thermally conductive member.

Apparently, in the foregoing implementation, the another semiconductor refrigeration chip is disposed between the transmit coil and the first thermally conductive member, thereby further improving cooling efficiency of the transmit coil.

In a possible implementation, a first cavity and a second cavity are disposed in the housing, and the second cavity is located above the first cavity. The fan and the another fan are disposed in the first cavity. The transmit coil, the semiconductor refrigeration chip, and the first thermally conductive member are sequentially disposed in the second cavity.

Apparently, in the foregoing implementation, the air blown by the fan and the air blown by the another fan are respectively blown to the first thermally conductive member and between the electronic device and the panel, so that both the electronic device and the wireless charging device are cooled, thereby improving cooling efficiency.

In a possible implementation, the first cavity includes a first segment and a second segment, the second segment extends upward along a curve from the first segment to the air vent, the fan is located in the first segment, and the semiconductor refrigeration chip is located in the second segment.

Apparently, in the foregoing implementation, the second segment extends upward along a curve from the first segment to the air vent, so as to guide the air blown by the fan to be blown out from the air vent, and reduce a force of the air blown by the air vent on the electronic device placed on the housing.

In a possible implementation, the wireless charging device further includes a circuit board, the housing is further provided with a third cavity and an air exhaust vent that communicate with each other, and the third cavity communicates with both the first cavity and the second cavity. The third cavity is located above the first cavity, and is located on a side of the second cavity. The circuit board is electrically connected to the transmit coil, the fan, and the another fan. The circuit board is disposed on the housing, and is located in the third cavity. The air blown by the another fan can be blown to the first thermally conductive member and the circuit board, and is discharged from the air exhaust vent.

Apparently, in the foregoing implementation, the another fan can also blow air to the circuit board, so that a temperature of the circuit board is reduced, and a cooling effect of the wireless charging device is further improved.

According to a second aspect, this application provides a wireless charging device, where the wireless charging device includes a housing, a transmit coil, and a heat dissipation assembly. The housing is provided with a panel. The heat dissipation assembly includes a semiconductor refrigeration chip, a first thermally conductive member, and a fan. The semiconductor refrigeration chip includes a cold end and a hot end. The panel, the transmit coil, the semiconductor refrigeration chip, and the first thermally conductive member are sequentially stacked. The cold end faces the transmit coil, and the hot end faces the first thermally conductive member. The fan is disposed in the housing, and the first thermally conductive member is obliquely disposed above the fan.

The air blown by the fan reduces a temperature of the first thermally conductive member, to improve a cooling effect of a cold end of the semiconductor refrigeration chip that is in contact with the first thermally conductive member, and reduce temperatures of the transmit coil and the panel that are sequentially in contact with the cold end, thereby reducing a temperature of the electronic device that is in contact with the panel.

In a possible implementation, a first cavity and a second cavity are disposed in the housing, and the second cavity is located above the first cavity. The fan is located in the first cavity. The transmit coil, the semiconductor refrigeration chip, and the first thermally conductive member are sequentially disposed in the second cavity.

Apparently, in the foregoing implementation, the third cavity is located above the first cavity, and is located on a side of the second cavity, to enable the air blown by the fan to enter the third cavity from the first cavity and be directly blown to the first thermally conductive member, so as to effectively reduce a temperature of the hot end of the semiconductor refrigeration chip, so that a temperature of the cold end of the semiconductor refrigeration chip is maintained at a lower temperature, or a low-temperature state is maintained for a longer time.

In a possible implementation, the wireless charging device further includes a circuit board, the housing is further provided with a third cavity and an air exhaust vent that communicate with each other, and the third cavity communicates with both the first cavity and the second cavity. The third cavity is located above the first cavity, and is located on a side of the second cavity. The circuit board is electrically connected to the transmit coil and the fan. The circuit board is disposed on the housing, and is located in the third cavity. The air blown by the fan can be blown to the first thermally conductive member and the circuit board, and is discharged from the air exhaust vent.

Apparently, in the foregoing implementation, the fan can also blow air to the circuit board, so that a temperature of the circuit board is reduced, and a cooling effect of the wireless charging device is further improved.

In a possible implementation, the wireless charging device further includes a second thermally conductive member, and the second thermally conductive member is disposed between the transmit coil and the semiconductor refrigeration chip.

Apparently, in the foregoing implementation, when an area of the cold end of the semiconductor refrigeration chip parallel to the panel is smaller than an area of the second thermally conductive member parallel to the panel, the second thermally conductive member can conduct all heat of the transmit coil parallel to a surface of the panel, and then conduct the heat to the semiconductor refrigeration chip, thereby improving cooling efficiency.

In a possible implementation, the heat dissipation assembly further includes a third thermally conductive member, and the third thermally conductive member is disposed between the semiconductor refrigeration chip and the first thermally conductive member.

Apparently, in the foregoing implementation, when an area of the hot end of the semiconductor refrigeration chip parallel to the panel is smaller than an area of the third thermally conductive member parallel to the panel, the third thermally conductive member can conduct all heat of the hot end parallel to the panel, and then conduct the heat to the first thermally conductive member, thereby improving cooling efficiency.

In a possible implementation, the second thermally conductive member or the third thermally conductive member is a thermally conductive structure made of a thermally conductive material that is deformable under pressure.

Apparently, in the foregoing implementation, when one of surfaces of the transmit coil and the semiconductor refrigeration chip that are opposite to each other is uneven because of deformation, a pit, or a bump, the second thermally conductive member is pressed by the transmit coil and the semiconductor refrigeration chip to deform, so as to be evenly in contact with both the transmit coil and the semiconductor refrigeration chip, thereby improving heat conduction efficiency. The third thermally conductive member is a thermally conductive structure made of a thermally conductive material that is deformable under pressure. The third thermally conductive member is pressed by the first thermally conductive member and the semiconductor refrigeration chip to deform, so as to be evenly in contact with both the first thermally conductive member and the semiconductor refrigeration chip, thereby improving heat conduction efficiency.

DESCRIPTION OF REFERENCE SIGNS OF MAIN COMPONENTS

DESCRIPTION OF EMBODIMENTS

To further describe technical means and effects that are used by this application to achieve a predetermined application objective, the following describes embodiments with reference to the accompanying drawings and implementations. Apparently, the described embodiments are merely some rather than all of the embodiments of this application.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by persons skilled in the art of this application. The terms used in the specification of this application are merely intended to describe specific embodiments, and are not intended to limit this application.

Some implementations of this application are described in detail below with reference to the accompanying drawings. If there is no conflict, the following embodiments and features in the embodiments may be mutually combined.

Referring toFIG.1andFIG.2, this application provides a wireless charging device100. The wireless charging device100is configured to charge an electronic device200. The electronic device200may be a mobile phone, a tablet personal computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a personal digital assistant (Personal Digital Assistant. PDA), a mobile Internet device (Mobile Internet Device. MID), a wearable device (Wearable Device), or the like.

The wireless charging device100includes a housing10, a transmit coil20, and a heat dissipation assembly30. A first cavity102and a second cavity103are disposed in the housing10. The second cavity103is located above the first cavity102. The housing10is provided with a panel11. The transmit coil20is disposed in the first cavity102, and is in contact with one side of the panel11. The wireless charging device100generates an alternating current electromagnetic field when the transmit coil20is connected to an alternating current power supply, so that a coil in the electronic device200generates an inducting voltage in the alternating current magnetic field, thereby implementing wireless charging on the electronic device200.

The electronic device200is placed on the housing10, and the electronic device200is at a distance from the panel11, as shown inFIG.1. The heat dissipation assembly30includes a semiconductor refrigeration chip31and a fan32. The semiconductor refrigeration chip31and the fan32are separately disposed in the first cavity102. The housing10is further provided with an air vent101communicating with the first cavity102. The air vent101is located under the panel11. The semiconductor refrigeration chip31is made based on a Peltier (Peltier) effect of a semiconductor material. The Peltier effect refers to a phenomenon that one end absorbs heat and the other end dissipates heat when a direct current passes through a galvanic couple formed by two different semiconductor materials in series. The semiconductor refrigeration chip31made based on this principle includes a cold end311and a hot end312that are on opposite sides. The cold end311may cool adjacent components, and heat is transferred through the hot end312. The semiconductor refrigeration chip31is disposed on the housing10, and is located in the first cavity102. The hot end312of the semiconductor refrigeration chip31is fixedly connected to the housing10, and the cold end311protrudes into the first cavity102. The air blown by the fan32passes through the cold end311and is blown out from the air vent101.

A temperature of the air that passes through the cold end311is reduced, and the air passes between the panel11and the electronic device200to reduce a temperature of the electronic device200.

The panel11is made of an insulating and heat-insulation material (for example, a glass fiber or a vacuum plate). Heat generated by the transmit coil20is not conducted between the panel11and the electronic device200through the panel11, so that cooling of the electronic device200by the air blown from the air vent101is improved.

It may be understood that, in another embodiment, the panel11may alternatively be made of an insulating and thermally conductive non-metallic material, such as a carbon fiber material or a ceramic material. The air blown from the air vent101may cool both the panel11and the electronic device200, and the cooling of the panel11reduces a temperature of the transmit coil20.

The fan32and the semiconductor refrigeration chip31are located in the first cavity102. The semiconductor refrigeration chip31is closer to the air vent101than the fan32. An air intake vent105is disposed at the bottom of the housing10. The air intake vent105is located on a side that is of the first cavity102and that is away from the second cavity103. The air intake vent105communicates with the first cavity102. Air enters the first cavity102from the air intake vent105, and the fan32guides the air to blow between the electronic device200and the panel11through the air vent.

It may be understood that, in another embodiment, the air intake vent105may alternatively be disposed on a side that is of the first cavity102and that is away from the air vent101. A position of the air intake vent105on the first cavity102may be set based on an air guiding direction of the fan32, provided that the fan32can guide air entering from the air intake vent105to be blown out of the air vent101.

There is one semiconductor refrigeration chip31and the hot end312of the semiconductor refrigeration chip31is disposed on a cavity wall that is of the first cavity102and that faces the second cavity103, but is not limited thereto. For example, in another embodiment, there are two semiconductor refrigeration chips31. The two semiconductor refrigeration chips31are disposed opposite to each other on two opposite cavity walls of the first cavity102, and cold ends311of the two semiconductor refrigeration chips are disposed opposite to each other. The air blown by the fan32is blown to the cold ends311of the two semiconductor refrigeration chips31, so that the air blown between the electronic device200and the panel11is quickly cooled, thereby improving efficiency of reducing a temperature of the electronic device200.

The housing10is further provided with a support part12on a side of the air vent101. The support part12is configured to support the electronic device200. The housing10is further provided with a spacing part13. There are two spacing parts13. The two spacing parts13are disposed at intervals and protrude from the panel11. The spacing part13is configured to be in contact with the electronic device200, so that there is a distance between the electronic device200and the panel11.

It may be understood that, in another embodiment, a quantity of spacing parts13may be one or another number. Provided that the spacing part13protrudes from the panel11, the electronic device200is placed on the housing10, and is in contact with the spacing part13, so that there is a distance between the electronic device200and the panel11.

The first cavity102includes a first segment1021and a second segment1022that communicate with each other. The fan32is disposed in the first segment1021. The second segment1022is closer to the air vent101than the first segment1021. The second segment1022extends upward along a curve from the first segment1021to the air vent101, so as to guide the air blown by the fan32to blow out from the air vent101, and reduce a force of the air blown by the air vent101on the electronic device200placed on the housing10. The fan32blows air in a direction of the first segment1021toward the second segment1022.

It may be understood that, in another embodiment, the first segment1021may alternatively be obliquely disposed along a straight line, or the first segment1021extends from the second segment1022to the air vent101along two straight paths that intersect along an L-shape or a V-shape.

The heat dissipation assembly30further includes a first thermally conductive member33. The first thermally conductive member33is disposed on the housing10, and is located in the first cavity102. The panel11, the transmit coil20, and the first thermally conductive member33are sequentially stacked, and sequentially transmit heat.

The first thermally conductive member33may be separated from the housing10, and the first thermally conductive member33is exposed from the housing10and is in contact with air outside the housing10. The first thermally conductive member33may be in an integrated structure with the housing10, and the first thermally conductive member33is in contact with the air outside the housing10.

Heat of the transmit coil20is conducted to the first thermally conductive member33, and the first thermally conductive member33dissipates the heat to the outside of the first cavity102.

It may be understood that, in another embodiment, the first thermally conductive member33may alternatively be omitted.

The transmit coil20includes a coil body21and a soft magnet23. The panel11, the coil body21, and the soft magnet23are sequentially disposed. The soft magnet23can improve strength of a magnetic field generated when the coil body21is energized.

The soft magnet23is made of a soft magnetic material, for example, the soft magnet23may be made of a ferrite or an iron-based amorphous alloy.

The transmit coil20and the first thermally conductive member33may be separately connected to the housing10in an adhesive manner, but is not limited thereto. For example, as shown inFIG.2, the first thermally conductive member33is locked on the housing10by using a fastener14such as a screw; so that the first thermally conductive member33and the panel11are respectively pressed against both sides of the transmit coil20, and the transmit coil20and the first thermally conductive member33are fastened to the housing10, thereby avoiding impact of heat-conducting property of adhesive on heat conduction efficiency of the transmit coil20and the first thermally conductive member33.

The wireless charging device100further includes a circuit board40. The circuit board40is disposed on the housing10, and is located in the first cavity102. The circuit board40is located on a side that is of the fan32and that is away from the air intake vent105, and the circuit board40is electrically connected to the transmit coil20, the fan32, and the semiconductor refrigeration chip31, so as to control the transmit coil20, the fan32, and the semiconductor refrigeration chip31to operate.

In the wireless charging device100, the air blown by the fan32passes through the cold end311of the semiconductor refrigeration chip31, so that the air cools down and passes through the air vent101to flow between the panel11and the electronic device200, thereby improving a cooling effect of the electronic device200.

Referring toFIG.3andFIG.4, a difference between a wireless charging device100ain another embodiment and the wireless charging device100lies in that the wireless charging device100afurther includes another fan32aand another semiconductor refrigeration chip31a, and a structure of a housing10of the wireless charging device100ais different from a structure of a housing10aof the wireless charging device100a.

The semiconductor refrigeration chip31ais stacked on a side of a transmit coil20and a first thermally conductive member33. The fan32ais disposed on a first housing, and is located in a first cavity102, but is not limited thereto. The fan32ais located on a side that is of the fan32aand that is away from the semiconductor refrigeration chip31a.

The housing10ais further provided with a third cavity104and an air exhaust vent106. The third cavity104communicates with both the first cavity102and a second cavity103. The third cavity104is located above the first cavity102, and is located on a side of the second cavity103. The air exhaust vent106is located on a side that is of the third cavity104and that is away from the first thermally conductive member33. The air blown by the fan32acan be blown to the first thermally conductive member33and discharged from the air exhaust vent106, thereby reducing a temperature of the first thermally conductive member33, and then reducing a temperature of the transmit coil20.

The first thermally conductive member33is obliquely disposed above the fan32a, to increase projection of the first thermally conductive member33on the fan32a, so that the air blown by the fan32amay be directly blown to a larger area of the first thermally conductive member33, thereby improving efficiency of reducing the temperature of the first thermally conductive member33.

The air blown by the fan32aand the air blown by the fan32respectively are respectively blown to the first thermally conductive member33and between the electronic device200and the panel11, so that both the electronic device200and the wireless charging device100are cooled, thereby improving cooling efficiency.

The wireless charging device100afurther includes a circuit board40. The circuit board40is disposed on the housing10a, and is located on a cavity wall that is of the third cavity104and that is away from the first thermally conductive member33. The circuit board40is electrically connected to the transmit coil20, the fan32a, and the fan32a. The circuit board40is obliquely disposed above the fan32a, so that the air blown by the fan32acan be blown to the circuit board40, and the circuit board40is cooled.

The wireless charging device100afurther includes a second thermally conductive member34, and the second thermally conductive member34is disposed between the transmit coil20) and the semiconductor refrigeration chip31a. The second thermally conductive member34is a thermally conductive structure made of a thermally conductive material that is deformable under pressure. For example, the second thermally conductive member34is a sheet-like structure made of thermally conductive silicone. Hardness of the transmit coil20and hardness of the semiconductor refrigeration chip31aare greater than hardness of the second thermally conductive member34. When one of surfaces of the transmit coil20and the semiconductor refrigeration chip31athat are opposite to each other is uneven because of deformation, a pit, or a bump, the second thermally conductive member34is pressed by the transmit coil20and the semiconductor refrigeration chip31ato deform, so as to be evenly in contact with both the transmit coil20and the semiconductor refrigeration chip31a, thereby improving heat conduction efficiency. It may be understood that, in another embodiment, the second thermally conductive member34may alternatively be made of a hard thermally conductive material. When an area of a cold end311aof the semiconductor refrigeration chip31aparallel to the panel11is smaller than an area of the second thermally conductive member34parallel to the panel11, the second thermally conductive member34can conduct all heat of the transmit coil20parallel to the panel11, and then conduct the heat to the semiconductor refrigeration chip31a, thereby improving cooling efficiency.

It may be understood that, in another embodiment, when an area of the cold end311aand the hot end312athat are of the semiconductor refrigeration chip31aparallel to the panel11is more than 50% of an area of the transmit coil20parallel to the panel11, both the first thermally conductive member33and the second thermally conductive member34may be omitted.

The heat dissipation assembly30further includes a third thermally conductive member35, and the third thermally conductive member35is disposed between the semiconductor refrigeration chip31aand the first thermally conductive member33. The third thermally conductive member35is a thermally conductive structure made of a thermally conductive material that is deformable under pressure. The third thermally conductive member35is pressed by the first thermally conductive member33and the semiconductor refrigeration chip31ato deform, so as to be evenly in contact with both the first thermally conductive member33and the semiconductor refrigeration chip31a, thereby improving heat conduction efficiency.

It may be understood that, in another embodiment, the semiconductor refrigeration chip31amay alternatively be omitted. Heat of the transmit coil20is conducted to the first thermally conductive member33, and the fan32ablows air to the first thermally conductive member33, which can also reduce a temperature of the first thermally conductive member33.

In the wireless charging device100a, the air blown by the fan32passes through the cold end311of the semiconductor refrigeration chip31, so that the air cools down and passes through the air vent101to flow between the panel11and the electronic device200, thereby improving a cooling effect of the electronic device200. In the wireless charging device100a, the air is blown to the first thermally conductive member33through the fan32a, a temperature of the transmit coil20is reduced through heat conduction between the first thermally conductive member33and the transmit coil20. The wireless charging device100acan cool both the electronic device200and the transmit coil20.

Referring toFIG.5andFIG.6, in still another embodiment, a wireless charging device100bincludes a housing10ab, a transmit coil20, and a heat dissipation assembly30. The housing10abis provided with a panel11. The heat dissipation assembly30includes a semiconductor refrigeration chip31b, a first thermally conductive member33, and a fan32b. The semiconductor refrigeration chip31bincludes a cold end311band a hot end312b. The panel11, the transmit coil20, the semiconductor refrigeration chip31b, and the first thermally conductive member33are sequentially stacked. The cold end311bfaces the transmit coil20. The hot end312bfaces the first thermally conductive member33. The fan32bis disposed in the housing10ab. The first thermally conductive member33is obliquely disposed above the fan32b, to increase projection of the first thermally conductive member33on the fan32b, so that the air blown by the fan32bmay be directly blown to a larger area of the first thermally conductive member33, thereby improving efficiency of reducing a temperature of the first thermally conductive member33.

The panel11is made of an insulating and thermally conductive non-metallic material, such as a carbon fiber material or a ceramic material.

The housing10abis further provided with a support part12located under the panel11. The support part12is configured to support the electronic device200, so that the electronic device200is placed on the housing10ab, and is in contact with the panel11.

The air blown by the fan32breduces a temperature of the first thermally conductive member33, to improve a cooling effect of the cold end311bof the semiconductor refrigeration chip31bthat is in contact with the first thermally conductive member33, and then reduce temperatures of the transmit coil20and the panel11that are sequentially in contact with the cold end311b, thereby reducing a temperature of the electronic device200that is in contact with the panel11.

A first cavity102, a second cavity103, and a third cavity104are disposed in the housing10ab. The second cavity103is located above the first cavity102. The fan32bis located in the first cavity102. The transmit coil20, the semiconductor refrigeration chip31b, and the first thermally conductive member33are sequentially disposed in the second cavity103. The housing10abis further provided with an air exhaust vent106, and the air exhaust vent106communicates with the third cavity104. An air intake vent105communicating with the first cavity102is disposed at the bottom of the housing10ab. The third cavity104communicates with both the first cavity102and a second cavity103.

The third cavity104is located above the first cavity102, and is located on a side of the second cavity103, to enable the air blown by the fan32bto enter the third cavity104from the first cavity102and be directly blown to the first thermally conductive member33, so as to effectively reduce a temperature of the hot end312bof the semiconductor refrigeration chip31b, so that a temperature of the cold end311bof the semiconductor refrigeration chip31bis maintained at a lower temperature, or a low-temperature state is maintained for a longer time. Air enters the first cavity102from the air intake vent105, is blown out from the fan32band is blown to the first thermally conductive member33, and then is discharged from the air exhaust vent106. The wireless charging device100bfurther includes a circuit board40. The circuit board40is disposed on the housing10ab, and is located in the third cavity104. The circuit board40is electrically connected to the transmit coil20and the fan32b. The circuit board40is obliquely disposed above the fan32b, so that the air blown by the fan32bcan be blown to the circuit board40, and the circuit board40) is cooled.

The wireless charging device100bfurther includes a second thermally conductive member34, and the second thermally conductive member34is disposed between the transmit coil20and the semiconductor refrigeration chip31b. The second thermally conductive member34is a thermally conductive structure made of a thermally conductive material that is deformable under pressure. For example, the second thermally conductive member34is a sheet-like structure made of thermally conductive silicone. Hardness of the transmit coil20and hardness of the semiconductor refrigeration chip31bare greater than hardness of the second thermally conductive member34. When one of surfaces of the transmit coil20and the semiconductor refrigeration chip31athat are opposite to each other is uneven because of deformation, a pit, or a bump, the second thermally conductive member34is pressed by the transmit coil20and the semiconductor refrigeration chip31bto deform, so as to be evenly in contact with both the transmit coil20and the semiconductor refrigeration chip31b, thereby improving heat conductive efficiency.

It may be understood that, in another embodiment, the second thermally conductive member34may alternatively be made of a hard thermally conductive material. When an area of the cold end311bof the semiconductor refrigeration chip31bparallel to the panel11is smaller than an area of the second thermally conductive member34parallel to the panel11, the second thermally conductive member34can conduct all heat of the transmit coil20parallel to the panel11, and then conduct the heat to the semiconductor refrigeration chip31b, thereby improving cooling efficiency.

It may be understood that, in another embodiment, when an area of the cold end311band the hot end312bthat are of the semiconductor refrigeration chip31bparallel to the panel11is more than 50% of an area of the transmit coil20parallel to the panel11, both the first thermally conductive member33and the second thermally conductive member34may be omitted.

The heat dissipation assembly30further includes a third thermally conductive member35, and the third thermally conductive member35is disposed between the semiconductor refrigeration chip31band the first thermally conductive member33. When an area of the hot end312bof the semiconductor refrigeration chip31bparallel to the panel11is smaller than an area of the third thermally conductive member35parallel to the panel11, the third thermally conductive member35can conduct all heat of the hot end312bparallel to the panel11, and then conduct the heat to the first thermally conductive member33, thereby improving cooling efficiency.

The third thermally conductive member35is a thermally conductive structure made of a thermally conductive material that is deformable under pressure. The third thermally conductive member35is pressed by the first thermally conductive member33and the semiconductor refrigeration chip31bto deform, so as to be evenly in contact with both the first thermally conductive member33and the semiconductor refrigeration chip31b, thereby improving heat conductive efficiency.

The wireless charging device100bcools the transmit coil20, the panel11, and the electronic device200that are sequentially in contact with each other through the cold end311bof the semiconductor refrigeration chip31b, and the fan32bblows air to the first thermally conductive member33, so that the hot end312bthat is in contact with the first thermally conductive member33is cooled, thereby improving a cooling effect.

The wireless charging device100, the wireless charging device100a, and the wireless charging device100bmay charge the electronic device, and a heat dissipation effect is good in a charging process. For example, the electronic device is a mobile phone, a tablet computer, a headset, a headset case, or a smartwatch.

The foregoing embodiments are merely intended to describe the technical solutions of this application, but are not intended to constitute limitations. Although this application is described in detail with reference to preferred embodiments, persons of ordinary skill in the art should understand that the technical solutions of this application may be modified or equivalent replaced without departing from the spirit and essence of the technical solutions of this application.