Wireless charger
Through the flat runway-shaped coil module and fan design, combined with the detached eddy current structure, the problem of poor heat dissipation of wireless chargers is solved, achieving low-cost and efficient heat dissipation and extending the life of the equipment.
Patent Information
- Application Number
- CN202422358174.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-09-26
AI Technical Summary
Existing wireless chargers have problems with heat dissipation, such as high cost, large size, and poor heat dissipation effect. In particular, they cannot effectively dissipate heat in the receiving coil area, resulting in a shortened device lifespan or damage.
A flat runway-shaped coil module, functional circuit board, and fan design are used. The coil and fan are placed away from the receiving wireless charging device, and the fan blades are far enough away from the coil to avoid collision. The airflow directly hits the coil and circuit board and then merges to flow along the receiving coil area. Combined with the off-body vortex generation structure, the airflow is ensured to flow close to the surface of the receiving coil.
It achieves low-cost, high-efficiency heat dissipation, significantly extends the service life of wireless charging equipment, and avoids equipment damage caused by overheating.
Smart Images
Figure CN223321829U_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a wireless charger with a good ventilation structure and a blower fan, and in particular to an air duct design that can directly and actively dissipate heat in a receiving coil area of a device that receives wireless charging energy. Background Art
[0002] Wireless charging power levels for devices like personal mobile devices are increasing. Because these devices are not suitable for high-voltage electronic components, increasing power generally means increasing the current in a proportional manner. According to Ohm's law, the heat generated by the wireless charging transmitter and receiver coils also increases at the square rate.
[0003] For example, when the charging power is 10V1A, the wireless charging transmitting coil will generate 0.2W of heat and the wireless charging receiving coil will generate 0.5W of heat, causing a temperature rise of about 20°C; when the charging power is 10V2A, the wireless charging transmitting coil will generate 0.8W of heat and the wireless charging receiving coil will generate 2W of heat, causing a temperature rise of about 38°C. At this time, the lithium battery close to the wireless charging receiving coil begins to show life degradation; when the charging power is 10V3A, the wireless charging transmitting coil will generate 1.8W of heat and the wireless charging receiving coil will generate 4.5W of heat, causing a temperature rise of about 53°C. At this time, the lithium battery close to the wireless charging receiving coil will experience serious life degradation or even damage and spontaneous combustion.
[0004] Therefore, without the assistance of an external active cooling module, to prevent damage to personal mobile devices, the charging power of personal mobile devices is initially 100% of the nominal value, and then actively limited to a fraction of the nominal value. This results in a very poor user experience.
[0005] Therefore, some wireless chargers are equipped with fans, semiconductor refrigeration modules and other devices to actively dissipate heat in order to keep the charging power at around 100%.
[0006] However, semiconductor refrigeration modules are expensive, bulky, and have high ineffective power consumption. Therefore, in reality, the combined retail price of wireless chargers and their corresponding high-power power supplies that use semiconductor refrigeration modules is more than ten times that of ordinary wireless chargers and their corresponding low-power power supplies. Therefore, the proportion of users who purchase these modules is approximately 1%.
[0007] As for wireless chargers that use fans for air blowing, because the relevant R&D companies do not have the ability to analyze and design wireless charging magnetic fields, they must use the circular transmitting coil of ordinary wireless chargers. The diameter of the circular transmitting coil is generally 45~50mm, and it just covers the wireless charging receiving coil of the personal mobile device during wireless charging, causing the airflow generated by the fan to be unable to directly contact the receiving coil area, so the active heat dissipation effect is very poor. As a result, this type of wireless chargers that use fans for air blowing are almost extinct in the real market.
[0008] In summary, society needs a low-cost, small-sized wireless charger that can directly dissipate heat efficiently in the wireless charging receiving coil area. Summary of the Invention
[0009] The present invention discloses a wireless charger, characterized in that it has a coil module, a functional circuit board and a fan, and a structural feature is that when the wireless charger is working, the coil module, the functional circuit board and the fan are one by one away from a device for receiving wireless charging energy, and the device for receiving wireless charging energy has a wireless charging receiving coil; the coil module has a coil and a soft magnetic material, and the coil is a flat runway-shaped coil, characterized in that the ratio of long diameter to short diameter is not less than 1.5 and the short diameter is not more than 30 mm, the soft magnetic material is arranged between the coil and the functional circuit board, and the soft magnetic material hardly exceeds the long side of the coil; the functional circuit board has an AC power generation module and a fan drive module, when rated power is input, the AC power generation module can provide the coil with the AC power required for the wireless charging function, and the fan drive module can generate power to drive the fan to rotate; the distance between the fan blades and the device for receiving wireless charging energy is not less than 1 / 20 of the fan blade diameter, and the fan blade diameter is not less than the short diameter of the coil.
[0010] When the fan is working, it first generates an airflow flowing along the axial direction. This airflow consists of two parts. The first part directly hits the coil module and the functional circuit board, taking away the heat of the coil module and the functional circuit board. The second part passes over the side of the coil and directly hits the wireless charging receiving coil area of the device receiving wireless charging energy. Then, after the first part of the airflow and the second part of the airflow are combined into one, they are squeezed by the airflow following behind and pushed by the fan blades, closely adhering to the surface of the device receiving wireless charging energy and leaving the range covered by the fan blades along the tangential direction of the rotation of the fan blades. Therefore, most of the airflow can directly take away the heat generated by the wireless charging receiving coil of the device receiving wireless charging energy.
[0011] Since the coupling effect is best when the wireless charging transmitting coil winding and the wireless charging receiving coil winding are facing each other, and the most energy can be transmitted, the coil has a pair of facing arc windings and a pair of facing nearly straight windings. The center of each circle of the pair of arc windings is very close to the geometric center of the coil. The wireless charging transmitting coil transfers energy to the wireless charging receiving coil through this pair of arc windings.
[0012] Since the wireless charging receiving coils of most personal mobile devices are circular with a diameter of 40-48 mm, the long diameter of the coil is 38-50 mm, the short diameter of the coil is 20-28 mm, and the blade diameter of the fan is 45-60 mm.
[0013] In order to prevent the fan blades of the wireless charger disclosed in the present invention from hitting the user or other objects when the wireless charger disclosed in the present invention is working, and to enhance the appearance of the wireless charger disclosed in the present invention, the present invention further comprises a first shell and a second shell. The first shell is box-shaped, and the coil is close to the inner side wall of the first shell. After the second shell is fixed to the first shell, it is located on the side of the fan away from the device receiving wireless charging energy.
[0014] The first shell has a first set of air duct structures. When the first shell is close to the surface of the device receiving wireless charging energy, it will form a first set of air ducts with the device receiving wireless charging energy. The airflow generated by the fan is blown out from the inside of the first shell through the first set of air ducts to the outside; the second shell has a second set of air duct structures, and the fan draws in external air through the second set of air ducts.
[0015] Considering that the heat sources of most personal mobile devices also include CPUs / GPUs, etc., which do not overlap with the wireless charging receiving coil, in order to simultaneously dissipate heat for the CPU / GPU, etc., the first housing is designed with a detached vortex generating structure in an area near the device for receiving wireless charging energy. The detached vortex generating structure has multiple fins, each of which is in the shape of a flat strip. The side of the fin with the largest area is almost parallel to the rotation axis of the fan. The angle between the side of the fin with the largest area and the line connecting point A at the front end of the windward surface of the fin and the rotation axis of the fan is in the range of 75° to 87° or 93° to 105°. The surface of the fin does not contact the device for receiving wireless charging energy.
[0016] When the fan is working, the generated airflow flows through both sides of the wing, creating a pressure difference on both sides of the wing, so that the air in the high-pressure area passes through the wing and the surface of the device receiving wireless charging energy to reach the low-pressure area, thereby generating a vortex. As the airflow flows out of the first group of air duct structures, the vortex separates from the wing to form a detached vortex.
[0017] Due to the structure and position of the wing, the rotation axis of the detached vortex is almost parallel to the surface of the device receiving wireless charging energy, so almost 100% of the air of the detached vortex can contact the surface of the device receiving wireless charging energy, thereby removing heat from the surface of the device receiving wireless charging energy with the highest efficiency.
[0018] In order to more easily generate the eddy current, the shortest distance from the surface of the wing to the device for receiving wireless charging energy is not less than the thickness of the wing.
[0019] Therefore, the present invention adopts a runway-shaped coil module to provide a low-cost fan with an impact airflow channel that directly contacts the wireless charging receiving coil area of the device receiving wireless charging energy, and separates the fan from the device receiving wireless charging energy through the coil module and the functional circuit board to form a face-to-face airflow channel, thereby achieving the beneficial effect of helping the wireless charging transmitting coil and the wireless charging receiving coil to dissipate heat at low cost and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a top view of the first embodiment of the present invention.
[0021] Figure 2 It is a bottom view of the first embodiment of the present invention.
[0022] Figure 3 It is a side view of the first embodiment of the present invention.
[0023] Figure 4 It is a side view of a second embodiment of the present invention.
[0024] Figure 5 It is a bottom view of a third embodiment of the present invention.
[0025] Figure 6 It is a side view of a third embodiment of the present invention. DETAILED DESCRIPTION
[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention and do not limit the scope of application of the present invention. For ordinary technicians in this field, the present invention can be applied to other similar scenarios based on these drawings without inventive work; as shown in this specification and claims, unless the context clearly indicates an exception, the words "one", "a", "an" and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "including" or "comprising" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment".
[0027] Figure 1 、 Figure 2 、 Figure 3 The first embodiment of the present invention is shown in FIG, which includes a coil module composed of a coil 11 and a soft magnetic material 12, a functional circuit board 2 and a fan 3. Figure 3 The coil 11 is shown closest to the device receiving the wireless charging energy.
[0028] Figure 4 This is a second embodiment of the present invention designed based on the first embodiment of the present invention. The second embodiment adds a first shell 41 and a second shell 42 . The first shell 41 has a first set of air ducts 411 , and the second shell 42 has a second set of air ducts 421 .
[0029] When the second embodiment is working, the fan 3 drives the airflow from the second group of air ducts 421 into the interior of the first shell 41 and the second shell 42 in the manner indicated by the dotted arrows, directly contacts the surface of the device receiving wireless charging energy, and leaves the interior of the first shell 41 and the second shell 42 from the first group of air ducts 411.
[0030] Figure 5 and Figure 6 This is a third embodiment that is further optimized based on the second embodiment. The third embodiment adds a detached vortex generating structure 43. The detached vortex generating structure includes multiple blades 431. Each blade 431 forms an angle a with the tangent of the dotted circle with the rotation axis of the fan 3 as the center axis at the front end of its windward surface. The value range of a is 75°~87° or 93°~105°.
[0031] When the third embodiment is working, the fan 3 will drive the airflow from the second group of air ducts 421 into the interior of the first shell 41 and the second shell 42 in the manner indicated by the dotted arrows, directly contact the surface of the device receiving the wireless charging energy, and produce a detached vortex with a rotation axis almost parallel to the surface of the device receiving the wireless charging energy along the wing 431, and leave the interior of the first shell 41 and the second shell 42 from the first group of air ducts 411.
[0032] Compared with the second embodiment, the shedding eddy current generated by the third embodiment can more effectively remove heat from other areas of the device receiving wireless charging energy.
Claims
1. A wireless charger, characterized in that: It has a coil module, a functional circuit board and a fan, and its structural features are When the wireless charger is working, the coil module, the functional circuit board and the fan are separated from the device receiving wireless charging energy one by one; The coil module comprises a coil and a soft magnetic material. The coil is a flat racetrack-shaped coil, characterized in that the ratio of the major diameter to the minor diameter is not less than 1.5, and the minor diameter is not greater than 30 mm. The soft magnetic material is arranged between the coil and the functional circuit board, and the soft magnetic material hardly exceeds the long side of the coil; The functional circuit board has an AC power generation module and a fan driving module. When rated power is input, the AC power generation module can provide the coil with the AC power required for the wireless charging function, and the fan driving module can generate power to drive the fan to rotate; The distance between the blades of the fan and the device for receiving wireless charging energy is not less than 1 / 20 of the diameter of the blades of the fan, and the diameter of the blades of the fan is not less than the short diameter of the coil.
2. A wireless charger according to claim 1, characterized in that: The coil has a pair of opposite arc-shaped windings and a pair of opposite nearly straight-line windings, and the centers of the respective arc-shaped windings are very close to the geometric center of the coil.
3. A wireless charger according to claim 1, characterized in that: The long diameter of the coil is 38-50 mm, the short diameter of the coil is 20-28 mm, and the blade diameter of the fan is 45-60 mm.
4. A wireless charger according to claim 1, characterized in that: It also has a first housing and a second housing, The first housing is box-shaped, and the coil is close to the inner wall of the first housing. After being fixed to the first housing, the second housing is located on a side of the fan away from the device for receiving wireless charging energy; The first housing has a first set of air duct structures. When the first housing is in close contact with the surface of the device receiving wireless charging energy, a first set of air ducts is formed with the device receiving wireless charging energy. The airflow generated by the fan is blown out from the inside of the first housing through the first set of air ducts to the outside. The second housing has a second set of air duct structures, and the fan draws external air through the second set of air ducts.
5. A wireless charger according to claim 4, characterized in that: The first housing is designed with a separate eddy current generating structure in an area close to the device for receiving wireless charging energy. The detached vortex generating structure has a plurality of fins. The wing is in the shape of a flat strip, and the side with the largest area of the wing is almost parallel to the rotation axis of the fan. The angle between the side surface of the blade with the largest area and the line connecting the front end point A of the windward surface of the blade and the fan rotation axis is in the range of 75° to 87° or 93° to 105°. The surface of the wing is not in contact with the device receiving wireless charging energy.
6. A wireless charger according to claim 5, characterized in that: The shortest distance from the surface of the wing to the device for receiving wireless charging energy is not less than the thickness of the wing.