Patent Description:
When charging a terminal device, a wireless charger transmits electric energy by using a magnetic field generated between coils, to avoid using a charging power cable. Therefore, it is quite convenient to use the wireless charger.

In the process of charging the terminal device (for example, a mobile phone), both the wireless charger and the terminal device generate heat. If the generated heat is not dissipated in a timely manner, charging power and a charging speed are directly affected. Therefore, a heat dissipation problem of the wireless charger and a heat dissipation problem of the terminal device in the charging process are currently thorny problems.

In the conventional technology, a fan is disposed in the wireless charger, heat in the wireless charger is dissipated by using the fan, and an air duct is disposed on a contact plate that is of the wireless charger and that is in contact with a rear surface of the terminal device, and heat of the rear surface of the terminal device is dissipated by using an airflow flowing in the air duct. However, heat of a display surface of the terminal device is naturally dissipated. Consequently, heat dissipation efficiency of the entire terminal device is limited, and the charging power and the charging speed of the terminal device are further limited.

<CIT> describes a heat radiation type wireless charger comprising a lower shell and an upper shell. The upper shell comprises a platform and a boss, and a fan is arranged in the boss. The side face, facing the platform, of the boss is provided with an air port.

<CIT> describes a wireless charging bracket with heat dissipation function, including hollow casing and embed transmitting coil, PCBA board, wind-guiding member and a fan in the casing. The surface of casing has a wind guide tank which is connected with air outlet and is used for placing the cell-phone.

Embodiments of this application provide a wireless charger, which is mainly intended to resolve a technical problem that a display surface of a terminal device has a poor heat dissipation effect in the conventional technology.

This application provides a wireless charger. The wireless charger is configured to charge a terminal device, the terminal device includes a display surface and a rear surface that are opposite to each other, and the wireless charger includes:.

According to the wireless charger provided in embodiments of this application, because the airflow guide structure is disposed on the side that is of the housing and that is adjacent to the contact plate, when the first fan works, an airflow flowing around the first fan passes through the air vent and flows to the flow channel of the airflow guide structure, and blows toward the display surface of the terminal device through the first air exhaust vent to dissipate heat of the display surface of the terminal device. Therefore, a heat dissipation effect on the display surface is significantly improved in comparison with an existing natural dissipation manner of the display surface. In addition, because the rear surface of the terminal device is in contact with the contact plate of the housing, a relatively cold airflow in the housing is conducted to the contact plate under the action of the first fan to dissipate heat of the rear surface of the terminal device. Therefore, in comparison with the conventional technology, the wireless charger provided in embodiments of this application can dissipate the heat of the rear surface of the terminal device and the heat of the display surface of the terminal device, so that a heat dissipation effect on the entire terminal device is effectively improved, and therefore charging power and a charging speed of the terminal device are increased accordingly. In addition, because the first fan is disposed in the housing, heat of the wireless charging module located in the housing is also dissipated, so that a heat dissipation effect on the wireless charging module is ensured.

The contact plate includes a metal part and a plastic part, and the wireless charging module is disposed at a position that is in the housing and that is opposite to the plastic part. Because the plastic part is disposed at a position that is of the contact plate and that is opposite to the wireless charging module, in comparison with a case in which the metal part is disposed at the position that is of the contact plate and that is opposite to the wireless charging module, the plastic part can ensure that the wireless charging module and the terminal device transmit electric energy by using an alternating magnetic field generated between coils, so that the terminal device is wirelessly charged. In addition, the contact plate further includes the metal part. The metal part has a higher thermal conductivity than the plastic part, so that the heat generated by the rear surface of the terminal device can be dissipated as soon as possible by using the metal part, thereby further improving a heat dissipation effect on the rear surface of the terminal device.

In a possible implementation, an air duct is formed on a side that is of the contact plate and that faces the rear surface of the terminal device, the air duct extends to the edge of the contact plate, a second air exhaust vent connected to the flow channel is disposed at a position that is of the airflow guide structure and that is close to the rear surface of the terminal device, and the second air exhaust vent is connected to the air duct. The air duct is disposed on the side that is of the contact plate and that faces the rear surface of the terminal device, the second air exhaust vent connected to the flow channel is disposed at the position that is of the airflow guide structure and that is close to the rear surface of the terminal device, and the second air exhaust vent is connected to the air duct, so that the airflow flowing around the first fan passes through the air vent and flows to the flow channel of the airflow guide structure, and then passes through the second air exhaust vent and flows to the air duct, to dissipate the heat emitted by the rear surface of the terminal device. In addition, because the air duct extends to the edge of the contact plate, an airflow obtained after the heat exchange in the air duct flows out of the contact plate to rapidly exhaust heat. Therefore, the wireless charger provided in embodiments of this application can further improve a heat dissipation effect on the rear surface of the terminal device.

In a possible implementation, a plurality of protrusions arranged in parallel exist on a side that is of the metal part and that faces the terminal device, an air duct is formed between two adjacent protrusions, a spacing exists between a side that is of the plastic part and that faces the terminal device and the rear surface of the terminal device, to form an air duct, and the air duct formed on the metal part is connected to the air duct formed on the plastic part. A plurality of protrusions arranged in parallel are disposed, so that an air duct is formed between two adjacent protrusions, and an airflow in the air duct dissipates the heat of the rear surface of the terminal device.

In addition, because the wireless charging module is disposed at the position that is in the housing and that is opposite to the plastic part, a relatively large amount of heat is conducted from the wireless charging module to the plastic part. The spacing exists between the side that is of the plastic part and that faces the terminal device and the rear surface of the terminal device, so that the air duct has a relatively large dissipation area and can rapidly dissipate heat on the plastic part.

To ensure wireless charging, a coil in the terminal device is disposed opposite to the wireless charging module. In this way, a relatively large amount of heat is also conducted from the coil in the terminal device to a first position on the rear surface of the terminal device. The spacing exists between the side that is of the plastic part and that faces the terminal device and the rear surface of the terminal device, so that the air duct has a relatively large dissipation area and can rapidly dissipate heat on the first position on the rear surface of the terminal device. The first position is a position that is of the terminal device and that is opposite to the plastic part.

In a possible implementation, the wireless charger further includes an auxiliary heat dissipation structure, and the auxiliary heat dissipation structure is disposed at a position that is in the housing and that is close to the contact plate. The auxiliary heat dissipation structure is disposed to further improve a heat dissipation effect on the terminal device. In a possible implementation, the auxiliary heat dissipation structure includes a refrigeration unit, the refrigeration unit includes a cold-end substrate and a hot-end substrate that are disposed opposite to each other, a plurality of semiconductor thermocouple pairs arranged in parallel exist between the cold-end substrate and the hot-end substrate, and both ends of the semiconductor thermocouple pair are disposed on the corresponding cold-end substrate and hot-end substrate by using conductive electrodes. The cold-end substrate abuts against the contact plate, and the hot-end substrate is away from the contact plate. The cold-end substrate abuts against the contact plate to absorb heat on the contact plate, and the contact plate is refrigerated by using the refrigeration unit performing thermoelectric refrigeration. The refrigeration unit has a simple structure and relatively low power consumption, and is capable of continuously working. The refrigeration unit can reach a maximum temperature difference several seconds after a current is applied. In addition, when the refrigeration unit works, no vibration occurs, and no noise is generated. Therefore, performance of the wireless charger is improved, and user experience is enhanced.

In a possible implementation, the auxiliary heat dissipation structure includes a second fan. The second fan is used to facilitate flowing of a peripheral airflow for heat dissipation.

In a possible implementation, the housing includes a base and an installation part connected to an end of the base, the installation part is tilted relative to the base to form a vertical structure, the wireless charging module is located in the installation part, the contact plate is formed on the installation part and is located on a side away from the base, the air vent is disposed at a position that is of the installation part and that is connected to the base, and the airflow guide structure and the base are disposed opposite to each other on both sides of the installation part. Because the housing includes the base and the installation part that are tilted relative to each other to form a vertical structure, and the airflow guide structure is disposed at the position that is of the installation part and that is connected to the base, the airflow guide structure can guide an airflow to enable the airflow to blow toward the display surface of the terminal device and also support the terminal device, so that the terminal device can be stably placed on the installation part.

In a possible implementation, airflow guide structures are disposed on both opposite sides of the installation part. Because the airflow guide structures are disposed on both opposite sides of the installation part, and cooperate with the airflow guide structure disposed at the position that is of the installation part and that is connected to the base, a heat dissipation effect on the display surface of the terminal device is further improved.

In a possible implementation, the first fan is disposed in the base. In comparison with a case in which both the wireless charging module and the first fan are disposed in the installation part in a thickness direction of the installation part, in the case in which the first fan is disposed in the base, a thickness and a size of the installation part can be reduced accordingly. In addition, the airflow guide structure located at the position that is of the installation part and that is connected to the base is close to the first fan, so that the airflow around the first fan rapidly flows through the flow channel and blows toward the display surface of the terminal device from the first air exhaust vent, thereby further improving a heat dissipation effect on the display surface of the terminal device.

In a possible implementation, the housing is of a flat plate structure, the wireless charging module and the first fan are vertically stacked in a thickness direction of the housing, the wireless charging module is close to the contact plate, the air intake vent is disposed on a first side of the housing, the air vent is disposed on a second side of the housing, and the first side and the second side are opposite to each other. Because the air intake vent and the air exhaust vent are disposed on opposite sides, a flowing resistance of an airflow can be reduced, and heat of the terminal device can be rapidly dissipated.

<NUM>-Housing; <NUM>-Contact plate; 101A-Plastic part; 101B-Metal part; <NUM>-Air intake vent; <NUM>-Air vent; <NUM>-Heat exhaust vent; <NUM>-Base; <NUM>-Installation part; <NUM>-Wireless charging module; <NUM>-Charging coil; <NUM>-Electromagnetic plate; <NUM>-Support pad; <NUM>-First fan; <NUM>-Airflow guide structure; <NUM>-Flow channel; <NUM>-First air exhaust vent; <NUM>-Second air exhaust vent; <NUM>-Protrusion; <NUM>-Air duct; <NUM>-Refrigeration unit; <NUM>-Cold-end substrate; <NUM>-Hot-end substrate; <NUM>-N-type semiconductor; <NUM>-P-type semiconductor; <NUM>-First conductive electrode; <NUM>-Second conductive electrode; <NUM>-Second fan; <NUM>-Thermally conductive block; 8Terminal device; <NUM>-Display surface; <NUM>-Rear surface.

Embodiments of this application relate to a wireless charger. The following describes the wireless charger in detail with reference to the accompanying drawings.

The wireless charger provided in embodiments of this application is configured to charge a terminal device. For example, the wireless charger is used to wirelessly charge an electronic device such as a mobile phone, a tablet computer, or a player. As shown in <FIG>, a terminal device <NUM> includes a display surface <NUM> and a rear surface <NUM> that are opposite to each other. Generally, a charging module in the terminal device is close to the rear surface. When the terminal device is specifically charged, the rear surface of the terminal device is in contact with a wireless charger to perform wireless charging.

Referring to <FIG>, the wireless charger provided in embodiments of this application includes a housing <NUM>, a wireless charging module <NUM>, a first fan <NUM>, and an airflow guide structure <NUM>. The housing <NUM> includes a contact plate <NUM> used for contact with the rear surface <NUM> of the terminal device <NUM>, both the wireless charging module <NUM> and the first fan <NUM> are disposed in the housing <NUM>, the first fan <NUM> can dissipate heat of the wireless charging module <NUM>, and an air intake vent <NUM> is disposed at a position that is of the housing <NUM> and that is close to the first fan <NUM>. The airflow guide structure <NUM> is disposed on a side that is of the housing <NUM> and that is adjacent to the contact plate <NUM>, the airflow guide structure <NUM> extends toward the display surface <NUM> of the terminal device <NUM>, the airflow guide structure <NUM> includes a flow channel <NUM>, a first air exhaust vent <NUM> connected to the flow channel <NUM> is disposed at a position that is of the airflow guide structure <NUM> and that is close to the display surface <NUM> of the terminal device <NUM>, an air vent <NUM> connected to space in which the first fan <NUM> is located is disposed at a position that is of the housing <NUM> and at which the airflow guide structure <NUM> is disposed, and the air vent <NUM> is connected to the flow channel <NUM>.

The wireless charger provided in embodiments of this application can wirelessly charge the terminal device and dissipate heat of the terminal device.

After the rear surface of the terminal device <NUM> abuts against the contact plate <NUM> of the housing <NUM>, a specific process in which the wireless charger dissipates the heat of the terminal device is as follows: When the first fan <NUM> runs, because the airflow guide structure <NUM> extends toward the display surface <NUM> of the terminal device <NUM>, and the first air exhaust vent <NUM> connected to the flow channel is disposed at the position that is of the airflow guide structure <NUM> and that is close to the display surface <NUM> of the terminal device <NUM>, an airflow flowing around the first fan <NUM> passes through the air vent <NUM> and flows to the flow channel <NUM> of the airflow guide structure <NUM>, and then the airflow in the flow channel <NUM> blows toward the display surface <NUM> of the terminal device <NUM> through the first air exhaust vent <NUM> to dissipate heat of the display surface <NUM> of the terminal device <NUM>, in other words, the heat of the display surface of the terminal device is dissipated through blowing. Therefore, a heat dissipation effect on the display surface is significantly improved in comparison with a natural dissipation manner. In addition, an airflow flowing around the first fan <NUM> also flows to the wireless charging module <NUM> to dissipate the heat emitted by the wireless charging module <NUM>. In addition, because the rear surface of the terminal device <NUM> is in contact with the contact plate <NUM> of the housing <NUM>, heat emitted by the rear surface of the terminal device <NUM> is also dissipated through thermal conduction under the action of the first fan, so that the heat of the rear surface of the terminal device <NUM> is dissipated.

Therefore, the wireless charger provided in embodiments of this application can dissipate the heat of the wireless charging module, the heat of the rear surface of the terminal device, and the heat of the display surface of the terminal device. In comparison with the conventional technology, in a same charging power condition, a heat dissipation capability of the terminal device is improved by at least <NUM>%, so that user experience is enhanced.

During specific implementation, an airflow guide plate with a hollow structure is installed at the air vent of the housing <NUM>, space in the airflow guide plate forms the flow channel, the first air exhaust vent is disposed at a position that is of the airflow guide plate and that is close to the display surface of the terminal device, and the airflow guide plate with the hollow structure and the first air exhaust vent forms the airflow guide structure.

A material of the airflow guide structure has a plurality of implementations. In some implementations, the material of the airflow guide structure is plastic. In other implementations, the material of the airflow guide structure is metal. To improve a heat dissipation effect, the material of the airflow guide structure is metal. The metal has a higher thermal conductivity than the plastic. In other words, using an airflow guide structure of the metal material further improves the heat dissipation effect.

There are a plurality of cases for a position at which the airflow guide structure <NUM> is disposed on the housing <NUM>. For example, the airflow guide structure <NUM> is disposed on a bottom surface that is of the housing <NUM> and that is adjacent to the contact plate <NUM>, as shown in <FIG>. For another example, the airflow guide structure <NUM> is disposed on a top surface that is of the housing <NUM> and that is adjacent to the contact plate <NUM>. For still another example, the airflow guide structure <NUM> is disposed on a side that is of the housing <NUM> and that is adjacent to the contact plate <NUM>, as shown in <FIG>.

There are usually the following two embodiments for a structure of the housing <NUM> of the wireless charger.

Embodiment <NUM>: Referring to <FIG>, <FIG>, <FIG>, and <FIG>, the housing <NUM> includes a base <NUM> and an installation part <NUM> connected to an end of the base <NUM>, the installation part <NUM> is tilted relative to the base <NUM> to form a vertical structure, the wireless charging module <NUM> is located in the installation part <NUM>, the contact plate <NUM> is formed on the installation part <NUM> and is located on a side away from the base <NUM>, the air vent <NUM> is disposed at a position that is of the installation part <NUM> and that is connected to the base <NUM>, and the airflow guide structure <NUM> and the base <NUM> are disposed opposite to each other on both sides of the installation part <NUM>.

Because the base <NUM> and the installation part <NUM> are tilted relative to each other to form a vertical structure, and the airflow guide structure <NUM> is disposed at the position that is of the installation part <NUM> and that is connected to the base <NUM>, the tilted terminal device <NUM> is blocked by the airflow guide structure <NUM> after the rear surface of the terminal device <NUM> abuts against the contact plate <NUM>, so that the terminal device <NUM> is prevented from moving downward. Therefore, disposing the airflow guide structure <NUM> at the position that is of the installation part <NUM> and that is connected to the base <NUM> can guide an airflow to the display surface of the terminal device <NUM> and also support the terminal device. One structure implements two functions, and performance of the wireless charger is improved without making the structure complex.

To further rapidly dissipate heat in the housing, a heat exhaust vent such as a heat exhaust vent <NUM> in <FIG> may be disposed at another position of the housing.

Embodiment <NUM>: Referring to <FIG> to <FIG>, the housing <NUM> is of a flat plate structure, the wireless charging module <NUM> and the first fan <NUM> are vertically stacked in a thickness direction of the housing <NUM>, the wireless charging module <NUM> is close to the contact plate <NUM>, the air intake vent <NUM> is disposed on a first side of the housing <NUM>, the air vent <NUM> is disposed on a second side of the housing <NUM>, and the first side and the second side are opposite to each other.

In other words, when the housing <NUM> is of a flat plate structure, the air intake vent <NUM> and the air vent <NUM> are disposed opposite to each other. This achieves the following technical effects: Under the action of the first fan <NUM>, an airflow passing through the air intake vent <NUM> rapidly passes through the air vent <NUM> and enters the flow channel <NUM> of the airflow guide structure <NUM>, and finally blows toward the display surface <NUM> of the terminal device <NUM> through the first air exhaust vent <NUM>. In addition, because the wireless charging module <NUM> and the first fan <NUM> are vertically stacked, the first fan <NUM> also rapidly dissipates the heat of the wireless charging module.

When the structure of the housing <NUM> is the structure described in Embodiment <NUM>, referring to <FIG> and <FIG>, airflow guide structures <NUM> are disposed on both opposite sides of the installation part <NUM>. Because the airflow guide structures are disposed on both opposite sides of the installation part <NUM>, and the airflow guide structure <NUM> is disposed at the position that is of the installation part <NUM> and that is connected to the base <NUM>, a heat dissipation effect on the display surface of the terminal device is significantly improved.

In addition, the airflow guide structures <NUM> are disposed on both opposite sides of the installation part <NUM>. Referring to <FIG>, the airflow guide structure at this position can also have a limiting function, to prevent the terminal device in contact with the contact plate <NUM> from moving in a direction P, thereby ensuring a charging effect.

There are a plurality of cases for a position of the airflow guide structure <NUM> disposed on the side of the installation part <NUM>. For example, the airflow guide structure <NUM> may be close to the middle of the installation part <NUM>. For another example, the airflow guide structure <NUM> is close to the top of the installation part <NUM>. The position at which the airflow guide structure <NUM> is disposed on the installation part <NUM> is not limited herein, and any structure falls within the protection scope of this application.

When the structure of the housing <NUM> is the structure described in Embodiment <NUM>, referring to <FIG>, the first fan <NUM> may be disposed in the base <NUM>. The following technical effects can be achieved when the first fan <NUM> is disposed in the base <NUM>: In comparison with a case in which both the first fan <NUM> and the wireless charging module <NUM> are disposed in the installation part <NUM>, a size of the installation part <NUM> can be reduced, and space in the base <NUM> can be fully used. In particular, the airflow guide structure located at the position that is of the installation part <NUM> and that is connected to the base <NUM> is close to the first fan, so that the airflow around the first fan rapidly flows through the flow channel and blows toward the display surface of the terminal device from the first air exhaust vent, thereby further improving a heat dissipation effect on the display surface of the terminal device.

To improve a heat dissipation effect on the rear surface <NUM> of the terminal device <NUM>, referring to <FIG> and <FIG>, an air duct <NUM> exists on a side that is of the contact plate <NUM> and that faces the rear surface <NUM> of the terminal device <NUM>, the air duct <NUM> extends to the edge of the contact plate <NUM>, a second air exhaust vent <NUM> connected to the flow channel is disposed at a position that is of the airflow guide structure <NUM> and that is close to the rear surface <NUM> of the terminal device <NUM>, and the second air exhaust vent <NUM> is connected to the air duct <NUM>.

A specific heat dissipation process of the rear surface <NUM> of the terminal device <NUM> is as follows: The airflow flowing around the first fan <NUM> passes through the air vent <NUM> and flows to the flow channel <NUM>, and then passes through the second air exhaust vent <NUM> and enters the air duct <NUM>, to dissipate the heat of the rear surface of the terminal device <NUM>. In addition, because the air duct extends to the edge of the contact plate, an airflow obtained after the heat exchange is exhausted from the air duct, to avoid affecting a heat dissipation effect because the airflow obtained after the heat exchange circulates in the air duct of the contact plate.

There are a plurality of cases for a structure of the air duct <NUM>. For example, the air duct is a straight air duct, as shown in <FIG>. For another example, the air duct is a curved air duct. The structure of the air duct is not limited herein, and an air duct of any structure falls within the protection scope of this application.

To ensure that the wireless charging module <NUM> in the housing <NUM> and the terminal device <NUM> transmit electric energy through electromagnetic induction of a coil, the contact plate <NUM> is usually made of a plastic material. However, a thermal conductivity of a contact plate <NUM> made of plastic is relatively low.

To further improve a heat dissipation effect, referring to <FIG>, the contact plate <NUM> includes a metal part 101B and a plastic part 101A, and the wireless charging module <NUM> is disposed at a position that is in the housing <NUM> and that is opposite to the plastic part 101A. The plastic part 101A is disposed at a position that is of the contact plate <NUM> and that is opposite to the wireless charging module <NUM>, to ensure that the wireless charging module and the terminal device transmit electric energy by using an alternating magnetic field generated between coils, so that the terminal device is wirelessly charged. In addition, the contact plate <NUM> further includes the metal part 101B. The metal part 101B is disposed to improve heat dissipation effects on the wireless charger and the terminal device. Therefore, using the contact plate including the metal part 101B and the plastic part 101A effectively improves the heat dissipation effects on the terminal device and the wireless charger while ensuring wireless charging.

If the contact plate <NUM> is a plastic part, in other words, does not include a metal part, referring to <FIG>, no air duct may be disposed on the contact plate that is a plastic part; or referring to <FIG>, the air duct <NUM> may be disposed on the contact plate that is a plastic part, and the air duct <NUM> is connected to the second air exhaust vent <NUM> of the airflow guide structure <NUM>. In this way, heat is exchanged between an airflow flowing inside the air duct and both the heat emitted by the wireless charger and the heat emitted by the terminal device. Therefore a heat dissipation effect is significantly improved in comparison with a contact plate on which no air duct is disposed.

If the contact plate <NUM> includes the metal part 101B and the plastic part 101A, referring to <FIG> and <FIG>, no air ducts may be disposed on the metal part 101B and the plastic part 101A, in other words, the rear surface <NUM> of the terminal device <NUM> is in contact with the metal part 101B and the plastic part 101A, so that the heat of the terminal device and the heat of the wireless charger are dissipated through thermal conduction.

If the contact plate <NUM> includes the metal part 101B and the plastic part 101A, air ducts may be disposed on the metal part 101B and the plastic part 101A to dissipate heat. There are a plurality of cases for specific structures of the air ducts. The following uses two embodiments for description.

Embodiment <NUM>: A plurality of protrusions arranged in parallel exist on a side that is of the metal part 101B and that faces the terminal device <NUM>, an air duct is formed between two adjacent protrusions, a plurality of protrusions arranged in parallel exist on a side that is of the plastic part 101A and that faces the terminal device <NUM>, an air duct is also formed between two adjacent protrusions, and the air duct on the metal part 101B is connected to the air duct on the plastic part 101A.

Embodiment <NUM>: Referring to <FIG>, <FIG>, <FIG>, and <FIG>, a plurality of protrusions <NUM> arranged in parallel exist on a side that is of the metal part 101B and that faces the terminal device <NUM>, an air duct <NUM> is formed between two adjacent protrusions <NUM>, a spacing exists between a side that is of the plastic part 101A and that faces the terminal device <NUM> and the rear surface of the terminal device, to form an air duct, and the air duct formed on the metal part is connected to the air duct formed on the plastic part.

When the structure in Embodiment <NUM> is used, the rear surface <NUM> of the terminal device <NUM> abuts against the protrusion on the metal part 101B during wireless charging of the terminal device <NUM>, so that a spacing exists between the rear surface of the terminal device <NUM> and the plastic part 101A, to form an air duct with a relatively large heat dissipation area.

The following technical effects are achieved when the structure shown in <FIG>, <FIG>, <FIG>, and <FIG> is used: Because the wireless charging module <NUM> is disposed opposite to the plastic part 101A, the heat emitted by the wireless charging module <NUM> is conducted to the plastic part 101A. Because the air duct with a relatively large heat dissipation area is formed at a position of the plastic part 101A, a flow velocity of an airflow is significantly increased, and the heat conducted to the plastic part 101A is dissipated as soon as possible. In addition, because the wireless charging module <NUM> is disposed opposite to the plastic part 101A, a coil in the terminal device <NUM> is also disposed opposite to the plastic part. Therefore, a relatively large amount of heat is also conducted to a position that is of the rear surface of the terminal device and that is opposite to the plastic part. Disposing the air duct with a relatively large heat dissipation area effectively increases the flow velocity of the airflow, to improve a dissipation speed of the heat emitted by the terminal device.

When the contact plate <NUM> includes the metal part 101B and the plastic part 101A, because the wireless charging module <NUM> is close to the middle of the contact plate <NUM>, the plastic part 101A is located in the middle of the contact plate, and the metal part 101B may be disposed around the plastic part 101A. For example, referring to <FIG>, the metal part 101B is located on both sides of the plastic part 101A in a length direction L of the contact plate <NUM>. Specific positions at which the metal part 101B and the plastic part 101A are disposed are not limited in this application. To further improve a heat dissipation effect of the wireless charger on the terminal device and a heat dissipation effect on the wireless charging module, the wireless charger further includes an auxiliary heat dissipation structure, and the auxiliary heat dissipation structure is disposed at a position that is in the housing and that is close to the contact plate. The auxiliary heat dissipation structure has a plurality of feasible structures. The following uses three embodiments for description.

Embodiment <NUM>: Referring to <FIG>, the auxiliary heat dissipation structure includes a refrigeration unit <NUM>, the refrigeration unit <NUM> includes a cold-end substrate <NUM> and a hot-end substrate <NUM> that are disposed opposite to each other, a plurality of semiconductor thermocouple pairs (N-type semiconductors <NUM> and P-type semiconductors <NUM>) arranged in parallel exist between the cold-end substrate <NUM> and the hot-end substrate <NUM>, and both ends of the semiconductor thermocouple pair are disposed on the corresponding cold-end substrate <NUM> and hot-end substrate <NUM> by using conductive electrodes. Specifically, one end of the semiconductor thermocouple pair is disposed on the cold-end substrate <NUM> by using a first conductive electrode <NUM>, and the other end of the semiconductor thermocouple pair is disposed on the hot-end substrate <NUM> by using a second conductive electrode <NUM>. In addition, the cold-end substrate <NUM> abuts against the contact plate, and the hot-end substrate <NUM> is away from the contact plate.

During working, the contact plate <NUM> can be refrigerated when currents are applied to the first conductive electrode and the second conductive electrode. In addition, the refrigeration unit <NUM> provided in this embodiment of this application performs thermoelectric refrigeration, and the contact plate is refrigerated by using the refrigeration unit performing thermoelectric refrigeration. The refrigeration unit has a simple structure and relatively low power consumption, and is pollution-free and capable of continuously working. The refrigeration unit can reach a maximum temperature difference several seconds after a current is applied. In addition, when the refrigeration unit works, no vibration occurs, and no noise is generated. Therefore, performance of the wireless charger is improved, and user experience is enhanced.

Embodiment <NUM>: Referring to <FIG>, the auxiliary heat dissipation structure includes a second fan <NUM>. The second fan generates a flowing airflow around the second fan to dissipate heat on the contact plate <NUM>.

Embodiment <NUM>: The auxiliary heat dissipation structure includes a heat dissipation fin, and the heat dissipation fin is close to the contact plate <NUM>. In other words, heat on the contact plate <NUM> is dissipated by using the heat dissipation fin.

In the wireless charging module provided in this embodiment of this application, as shown in <FIG>, the wireless charging module <NUM> includes a support pad <NUM> and an electromagnetic plate <NUM> and a charging coil <NUM> that are disposed above the support pad <NUM>, and the charging coil <NUM> is close to the contact plate <NUM>.

To further improve a heat dissipation effect on the wireless charging module, a thermally conductive block <NUM> is further disposed on a side that is of the wireless charging module <NUM> and that is away from the contact plate <NUM>. Specifically, the support pad <NUM> is disposed on the thermally conductive block <NUM>, so that a part of heat emitted by the wireless charging module is dissipated by using the thermally conductive block <NUM>.

Claim 1:
A wireless charger, wherein the wireless charger is configured to charge a terminal device (<NUM>), the terminal device comprises a display surface (<NUM>) and a rear surface (<NUM>) that are opposite to each other, and the wireless charger comprises:
a housing (<NUM>), comprising a contact plate (<NUM>) used for contact with the rear surface (<NUM>) of the terminal device (<NUM>);
a wireless charging module (<NUM>);
a first fan (<NUM>), capable of dissipating heat of the wireless charging module (<NUM>), wherein both the wireless charging module (<NUM>) and the first fan (<NUM>) are disposed in the housing (<NUM>), and an air intake vent (<NUM>) is disposed at a position that is of the housing (<NUM>) and that is close to the first fan (<NUM>); and
an airflow guide structure (<NUM>), disposed on a side that is of the housing (<NUM>) and that is adjacent to the contact plate (<NUM>), wherein the airflow guide structure (<NUM>) extends toward the display surface (<NUM>) of the terminal device (<NUM>), the airflow guide structure (<NUM>) comprises a flow channel (<NUM>), a first air exhaust vent (<NUM>) connected to the flow channel (<NUM>) is disposed at a position that is of the airflow guide structure (<NUM>) and that is close to the display surface (<NUM>) of the terminal device (<NUM>), an air vent (<NUM>) connected to space in which the first fan (<NUM>) is located is disposed at a position that is of the housing (<NUM>) and at which the airflow guide structure (<NUM>) is disposed, and the air vent (<NUM>) is connected to the flow channel (<NUM>);
wherein the contact plate (<NUM>) comprises a metal part (101B) and a plastic part (101A), and the wireless charging module (<NUM>) is disposed at a position that is in the housing (<NUM>) and that is opposite to the plastic part (101A).