Wireless charging device

Abstract

The utility model discloses a wireless charging device, which comprises a receiving coil, a shell and a transmitting coil, an insertion opening is formed in the end part of the shell; when the transmitting coil completely enters the interior of the shell from the insertion opening, the transmitting coil is fixed by the insertion opening, the transmitting coil and the receiving coil directly face each other and are in a matched state, and the gap and the offset between the transmitting coil and the receiving coil are smaller than or equal to a set threshold value. According to the utility model, the coil dislocation during charging can be reduced, the coil area can be reduced, the requirement for foreign matter detection can be reduced, and electromagnetic radiation can be reduced, so that the charging safety is ensured while the charging efficiency is ensured, and the manufacturing cost of the charging device is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of wireless charging technology, specifically relating to a wireless charging device, applicable to but not limited to electric bicycles, electric scooters, or scooters. Background Technology

[0002] Traditional wired charging for electric bicycles, scooters, and other electric vehicles presents numerous safety hazards. These include users using non-compliant, incompatible, or low-quality chargers; cable wear and tear; cable damage due to stretching or twisting; poor contact with the battery interface; and exposed plugs susceptible to moisture and short circuits. These factors increase the risk of fires caused by overload, short circuits, poor quality, electric shock, and sparks. Because it is difficult to regulate users and inspect their wired charging equipment, cables, and plugs, these safety hazards are hard to eliminate. Furthermore, wired charging is inconvenient, requiring manual plugging and unplugging, especially in rain or extreme weather. In contrast, wireless charging technology effectively solves these problems. Wireless charging transfers energy through electromagnetic induction between the transmitter and receiver, allowing charging without a direct wired connection. Since wireless charging eliminates physical contact, it improves the waterproof and dustproof properties of the charging device. Wireless charging not only eliminates the risk of electric shock associated with physical contact, but also prevents users from using their own wired chargers, fundamentally eliminating the aforementioned safety hazards caused by non-compliant or unsafe wired chargers. This significantly improves charging safety and makes the charging process more convenient, enhancing the user experience. Furthermore, because the coils and circuits can be completely enclosed in a casing, wireless charging offers advantages such as waterproofing and dustproofing, increasing safety for outdoor charging.

[0003] Existing wireless charging for electric bicycles typically involves installing a receiving coil at a specific location on the bicycle. When the bicycle is parked, the transmitting and receiving coils align within a certain range. This allows the transmitting coil to generate an electromagnetic field, and through electromagnetic induction between the transmitting and receiving coils, the receiving coil draws electrical energy and charges the bicycle via a connected circuit, all without physical contact. When the bicycle is parked within the designated wireless charging area, the charging system automatically detects and begins operation, eliminating the need for manual cable plugging or unplugging. While this charging method offers many conveniences, it also has some drawbacks, primarily including:

[0004] 1. Misalignment of transmitting and receiving coils: Wireless charging systems rely on the alignment of the receiving coil on the electric vehicle with the corresponding transmitting coil. If the vehicle is parked at an angle or misalignment, the alignment deviation or spacing between the coils will increase, leading to reduced charging efficiency and increased energy loss and heat generation.

[0005] 2. Heating caused by foreign metal objects: During the charging process, due to the possible large gap between the transmitting coil and the receiving coil, when foreign metal objects are present between the two coils, these foreign metal objects will generate eddy currents from the magnetic field, thereby generating heat.

[0006] Foreign object detection requires the integration of high-precision sensors and complex detection algorithms to avoid the risks of foreign object interference causing damage to the charging system and posing safety hazards. At the same time, ensuring the accuracy and reliability of foreign object detection is also difficult. Detecting the introduction of small metallic foreign objects during the charging process is particularly challenging.

[0007] 3. To ensure a certain degree of freedom in vehicle parking, including a certain range of lateral offset and longitudinal clearance, the vertical gap between the coils is relatively large. Combined with the offset of the center points of the two coils, the coupling coefficient of the coils becomes smaller. This necessitates increasing the current and area of ​​the transmitting coil, thereby increasing the intensity and range of electromagnetic radiation. Electromagnetic radiation includes radiation to people or living objects around the coils, as well as electromagnetic interference to surrounding electronic equipment. Due to the freedom of vehicle parking, it is also difficult to install structural components with electromagnetic shielding materials around the coils.

[0008] 4. To avoid reduced charging efficiency due to coil misalignment and charging distance, the charging system needs to increase the coil area to expand the charging area and ensure a certain coupling coefficient, which increases the material cost and installation cost.

[0009] It is evident that these drawbacks not only increase the design and manufacturing costs of the device, but also pose potential safety issues due to electromagnetic radiation and metallic foreign objects, thus presenting certain challenges to the widespread adoption of wireless charging technology. Utility Model Content

[0010] To address the aforementioned issues, this invention proposes a wireless charging device that not only reduces coil misalignment during charging, thus lowering the need for foreign object detection, but also significantly reduces electromagnetic radiation. This ensures charging efficiency, charging safety, and lowers the manufacturing cost of the charging system.

[0011] It also eliminates the need for users to bring their own wired chargers, thus fundamentally eliminating the safety hazards associated with wired charging.

[0012] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution:

[0013] A wireless charging device includes a receiving coil, a housing, and a transmitting coil;

[0014] The end of the housing is provided with an insertion port;

[0015] Once the transmitting coil is fully inserted into the housing through the insertion port, the insertion port secures the transmitting coil. The transmitting coil and the receiving coil are directly opposite each other and in a matched state, and the gap and offset between them are less than or equal to a set threshold.

[0016] Optionally, the sidewall of the insertion port is parallel to or at an angle to the front wall of the housing; after the transmitting coil is fully inserted into the interior of the housing from the insertion port, the transmitting coil is parallel to or at an angle to the front wall of the housing.

[0017] Optionally, the inner wall of the housing is provided with a groove corresponding to the insertion port. The groove is parallel to or at an angle to the front wall of the housing, and is used to accommodate and fix the transmitting coil.

[0018] Optionally, the included angle is ±15°~60°.

[0019] Optionally, the insertion port is located at the top of the housing; the bottom of the housing has a hollow structure or an opening.

[0020] Optionally, the transmitting coil has a cover that closes the insertion port on the housing after the transmitting coil has fully entered the housing from the insertion port.

[0021] Optionally, the wireless charging device further includes a transmitter coil holder for holding the transmitter coil.

[0022] Optionally, the sidewalls of the housing are provided with electromagnetic shielding material or metal material.

[0023] Optionally, the electromagnetic shielding material is a ferrite soft magnetic material, an amorphous nanocrystalline material, or an alloy soft magnetic material.

[0024] Optionally, the receiving coil is placed inside or outside the housing.

[0025] Optionally, the wireless charging device further includes a wireless charging transmitter module and a wireless charging receiver module; the wireless charging transmitter module includes a position detection circuit.

[0026] When the position detection circuit detects that the transmitting coil is inserted into a preset position inside the housing, the position detection circuit generates a charging trigger signal, which causes the wireless charging transmitting module to provide power to the transmitting coil, and further causes the transmitting coil to generate electromagnetic coupling with the receiving coil, and provides power to the wireless charging receiving module connected to the receiving coil.

[0027] Optionally, when the position detection circuit detects that the transmitting coil has left a preset position inside the housing, the position detection circuit generates a power-off trigger signal to cause the wireless charging transmitting module to stop providing power to the transmitting coil, thereby preventing electromagnetic coupling between the transmitting coil and the receiving coil.

[0028] Optionally, the wireless charging receiver module may be partially or entirely located inside or outside the housing.

[0029] Optionally, the wireless charging transmitter module may be partially or entirely located on the back of the transmitter coil.

[0030] Optionally, the wireless charging device further includes a position sensing circuit to help the position detection circuit detect whether the transmitting coil has reached or left a preset position inside the housing when it is inserted into or removed from the housing.

[0031] Optionally, the position sensing circuit is placed inside the transmitting coil or inside a cover connected to the transmitting coil, and is connected to the position detection circuit.

[0032] Optionally, both the receiving coil and the wireless charging receiving module are placed inside the housing of the device to be charged. The housing with the insertion port is placed outside the housing of the device to be charged, but is installed on the housing of the device to be charged, facing the front of the receiving coil. The receiving coil is close to the back of the housing. When the transmitting coil is inserted into the housing through the insertion port, the front of the transmitting coil and the front of the receiving coil inside the device to be charged can match well.

[0033] Optionally, a soft cover made of a material with a certain degree of elasticity and softness is installed on the housing near the insertion port. The soft cover has a main opening, and the length of the main opening is slightly greater than the length of the insertion port.

[0034] When the transmitting coil is inserted into the insertion port, the main opening of the soft cover will open;

[0035] When the transmitting coil is pulled out of the insertion port, the main opening of the soft cover will naturally close due to its own elasticity.

[0036] Optionally, the soft cover has multiple vertical openings that are perpendicular to the main opening of the soft cover.

[0037] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0038] This invention proposes a wireless charging device that can not only reduce coil misalignment during charging, but also reduce the need for foreign object detection and significantly reduce electromagnetic radiation, thereby ensuring charging efficiency, charging safety, and reducing the manufacturing cost of the charging system.

[0039] In this invention, the gap between the transmitting coil and the receiving coil can be very close (<5mm), resulting in strong coupling. Thus, a very small area of ​​coil can be used to provide and receive the designed power.

[0040] This invention charges the receiver coil by inserting it into the gap on the side of the receiver coil. The insertion port on the housing is at a certain angle to the front wall of the housing. Due to gravity, the transmitting coil can slide to the bottom and approach the receiver coil, maintaining a relatively fixed gap and position with a small margin (a few millimeters) for easy insertion and removal. Misalignment is largely eliminated, resulting in a strong coupling coefficient. Therefore, there is no need to increase the area of ​​the transmitting coil. The smaller transmitting coil results in a smaller volume and weight, ensuring ease of insertion and repositioning. Simultaneously, the strong coupling coefficient and small coil area reduce the intensity and range of electromagnetic radiation.

[0041] The insertion port of this utility model is located at the top of the housing (with the opening facing upwards), making it easier for users to take out the transmitting coil and insert it into the housing to charge electric vehicles, etc.

[0042] The transmitting coil in this invention has a cover that seals the insertion port on the housing after the transmitting coil is inserted, preventing foreign objects from entering. Therefore, foreign object detection only needs to be performed before charging, eliminating the need to detect foreign objects during charging, which greatly reduces the difficulty of foreign object detection. Furthermore, if a foreign object enters the insertion port when not charging, the hollow or open design at the bottom of the housing, along with the installation angle, allows the foreign object to slide out.

[0043] When the position detection circuit in this invention detects that the transmitting coil is inserted in place, it sends a trigger signal to the wireless charging transmitting module, causing the wireless charging transmitting module to provide power to the transmitting coil. When the transmitting coil is slightly pulled out by external force, the position detection circuit will send a trigger signal to the wireless charging transmitting module, causing the wireless charging transmitting module to stop providing power to the transmitting coil, ensuring safety during use.

[0044] This utility model also includes a transmitting coil placement component, which is used to install on the charging rack. Users can easily put the transmitting coil back on the charging rack and also easily remove it to insert into the receiving housing. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0046] Figure 1 This is a schematic block diagram of a wireless charging device according to an embodiment of the present invention;

[0047] Figure 2 This is a front view of a wireless charging device according to an embodiment of the present invention;

[0048] Figure 3 This is a rear view of a wireless charging device according to an embodiment of the present invention;

[0049] Figure 4 This is a side view of a wireless charging device in a charging state according to an embodiment of the present invention.

[0050] Figure 5 This is a schematic diagram of the internal structure of a wireless charging device in a charging state according to an embodiment of the present invention.

[0051] Figure 6 This is a schematic diagram of a wireless charging device in a charging state according to an embodiment of the present invention.

[0052] Figure 7 This is a side view of a wireless charging device according to an embodiment of the present invention;

[0053] Figure 8 This is a structural diagram of a soft cap according to an embodiment of the present invention;

[0054] in:

[0055] 1-Power supply, 2-House, 3-Cable, 4-Bottom of the house, 5-Cover, 6-Transmitting coil, 7-Insert port, 8-Receiving coil, 9-Transmitting coil holder, 10-Wireless charging transmitter module, 11-Transmitter charging circuit, 12-Transmitter control circuit, 13-Transmitter communication circuit, 14-Transmitter measurement circuit, 15-Transmitter protection circuit, 16-Position detection circuit, 20-Wireless charging receiver module, 21-Receiver charging circuit, 22-Receiver control circuit, 23-Receiver communication circuit, 24-Receiver measurement circuit, 25-Receiver protection circuit, 26-Receiver switch circuit, 30-Battery, 40-Soft cover, 41-Main opening of soft cover, 42-Vertical opening, 50-Car body, 70-Angle, 71-Front wall of the house, 72-Side wall of the insert port, 80-Front side of the transmitting coil, 81-Back side of the transmitting coil, 82-Front side of the receiving coil, 83-Back side of the receiving coil. Detailed Implementation

[0056] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0057] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may include different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0058] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0059] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] The application principle of this utility model will be described in detail below with reference to the accompanying drawings.

[0061] like Figures 1-6As shown, this utility model provides a wireless charging device, including a receiving coil 8, a housing 2, and a transmitting coil 6;

[0062] One side of the transmitting coil is the front side 80 of the transmitting coil, and the opposite side is the back side 81 of the transmitting coil;

[0063] One side of the receiving coil is the front side 82 of the receiving coil, and the opposite side is the back side 83 of the receiving coil;

[0064] The housing 2 has an insertion port 7 at its end. In specific implementations, the housing 2 can be configured to have good electrical insulation properties and a certain mechanical strength. The transmitting coil 6 has a protective shell. The protective shell has a certain mechanical strength to protect the transmitting coil 6 and any internal circuitry, while also having good electrical insulation properties. When the transmitting coil 6 is fully inserted into the housing 2 through the insertion port 7, the insertion port 7 fixes the transmitting coil 6, and the transmitting coil 6 and the receiving coil 8 are in a matched state, with the gap and offset between them less than or equal to a set threshold. In specific implementations, the matched state can mean that the front surface 80 of the transmitting coil and the front surface 82 of the receiving coil are facing each other, the coupling coefficient between the transmitting coil 6 and the receiving coil 8 can be greater than 0.25, and the rate of change of the coupling coefficient due to the gap and offset between the coils can be less than ±25%. The gap between the transmitting coil 6 and the receiving coil 8 can be set to <5mm, providing strong coupling, thus enabling the use of a very small coil area to provide and receive the designed power. Strong coupling and a relatively small electromagnetic field allow the transmitting coil to couple sufficient energy and achieve the designed output power. A smaller electromagnetic field and a smaller coil area mean that the transmitting coil requires a smaller current, resulting in a smaller electromagnetic radiation intensity and radiation range.

[0065] This invention proposes a wireless charging device that can not only reduce coil misalignment during charging, but also reduce the need for foreign object detection, thereby ensuring charging efficiency, charging safety, and reducing the manufacturing cost of the charging system.

[0066] In one specific embodiment of this utility model, the side wall 72 of the insertion port 7 is parallel to or at an angle 70 to the front wall 71 of the housing 2. When the transmitting coil 6 is fully inserted into the housing 2 through the insertion port 7, the transmitting coil 6 is parallel to or at an angle 70 to the front wall 71 of the housing 2. It can be seen that in this utility model, by inserting the transmitting coil 6 and charging it with the front surface 80 of the transmitting coil facing the front surface 82 of the receiving coil, and with the side wall 72 of the insertion port 7 of the housing 2 at a certain angle 70 to the front wall 71 of the housing 2, the position of the transmitting coil 6 can be basically fixed due to gravity, leaving a very small margin (a few millimeters) for easy insertion and removal. Misalignment can be basically eliminated, thus eliminating the need to increase the area of ​​the transmitting coil 6 and facilitating the removal of foreign objects. In specific implementation, the angle is ±15~60°. This angle helps the transmitting coil 6 to naturally move closer to the receiving coil 8 after insertion due to gravity, reducing the gap or gap variation range between the transmitting coil 6 and the receiving coil 8.

[0067] In one specific embodiment of this utility model, the inner wall of the housing 2 is provided with a groove corresponding to the insertion port 7. The groove is parallel to or at an angle to the front wall of the housing 2, and is used to accommodate and fix the transmitting coil 6. It can be seen that in this utility model, by inserting the transmitting coil 6 directly opposite the receiving coil 8 for charging, and with the side wall 72 of the insertion port 7 of the housing 2 at a certain angle to the front wall 71 of the housing 2, the position of the transmitting coil 6 can be basically fixed by gravity, leaving a very small margin (a few millimeters) for easy insertion and removal. Misalignment can be basically eliminated, thus eliminating the need to increase the area of ​​the transmitting coil 6 and facilitating the removal of foreign objects. In specific implementation, the angle is ±15~60°. This angle helps the transmitting coil 6 to naturally close to the receiving coil 8 after insertion due to gravity, reducing the gap or gap variation range between the transmitting coil 6 and the receiving coil 8.

[0068] In one specific embodiment of this utility model, the insertion port 7 is located at the top of the housing 2, that is, the insertion port 7 of the housing 2 faces upward, making it easier for the user to insert and remove the transmitting coil 6 to charge the electric vehicle waiting charging device. The transmitting coil 6 can naturally slide into the bottom due to gravity, and its relative position with the receiving coil 8 is basically fixed. The bottom 4 of the housing 2 is a hollow structure or has an opening at the bottom. If rainwater or other foreign objects fall into the housing 2, they can slide off from the bottom 4 of the housing 2.

[0069] In one specific embodiment of this utility model, the transmitting coil 6 has a cover 5. After the transmitting coil 6 is fully inserted into the housing 2 through the insertion port 7, the cover 5 closes the insertion port 7 on the housing 2. Therefore, in actual use, foreign object detection only needs to be performed before charging, and there is no need to detect foreign objects during charging, which greatly reduces the difficulty of foreign object detection. At the same time, after the transmitting coil is inserted and in place, since the relative positions of the two coils are relatively fixed, many electrical parameters used to detect metal foreign objects are also relatively fixed and consistent. This makes the threshold of the change in electrical parameters caused by metal foreign objects relatively easy to determine, reducing the difficulty of metal foreign object detection. Furthermore, when the transmitting coil is inserted into the housing 2, metal foreign objects can be scraped off by the opening of the insertion port 7. After the transmitting coil is inserted into the housing 2 and in place, since there is only a very small gap between the side wall 72 of the insertion port and the transmitting coil 6, even if a metal foreign object is brought in, it can only accommodate a very small metal foreign object, such as a staple. Even if the small metallic foreign object is missed, its small area and volume, coupled with the strong coupling between the coils in this invention, mean that only a small magnetic field strength is needed to transmit sufficient power to the output. Therefore, the small metallic foreign object will generate very small eddy currents in the low-intensity magnetic field, thus preventing a high temperature rise and posing no safety hazard. Furthermore, if a foreign object enters the insertion port 7 when the transmitting coil 6 is not inserted into the housing 2, the hollow or open design of the bottom 4 of the housing, along with the installation angle, will allow the foreign object to slide out of the housing 2.

[0070] The back surface 81 of the transmitting coil and the back surface 83 of the receiving coil may optionally be equipped with magnetic materials, such as ferrite, to enhance the coupling coefficient when the two coils are facing each other and to shield the magnetic field within the two coils.

[0071] In one specific embodiment of this utility model, some or all of the sidewalls of the housing 2 can be fitted with electromagnetic shielding material or metal material to shield electromagnetic radiation. This reduces electromagnetic radiation to people and living things around the housing, as well as electromagnetic interference to other electronic devices around the housing 2. It also shields the electromagnetic interference from the environment and surrounding electronic devices to the circuits inside the housing, increasing the reliability of the circuits inside the housing. The electromagnetic shielding material can be a high-permeability ferrite soft magnetic material, an amorphous nanocrystalline material, or an alloy soft magnetic material composed of iron, cobalt, nickel, manganese, etc. The metal material can be copper, aluminum, stainless steel, etc.

[0072] In one specific embodiment of this utility model, the receiving coil 8 is disposed inside or outside the housing 2. In specific implementation, the housing 2 can be installed at the front or other parts of the charging equipment of an electric vehicle.

[0073] In one specific embodiment of this utility model, the wireless charging device further includes a wireless charging transmitter module 10 and a wireless charging receiver module 20; the wireless charging transmitter module 10 is connected to the transmitting coil 6 via a cable 3. During charging, the AC power generated by the wireless charging transmitter module 10 is transmitted to the transmitting coil 6 via the cable 3. The wireless charging receiver module 20 is connected to the receiving coil 8. The electrical energy sensed by the receiving coil 8 is transmitted to the wireless charging receiver module 20. The wireless charging transmitter module 10 includes a position detection circuit 16. When the position detection circuit 16 detects that the transmitting coil 6 is inserted into a preset position inside the housing 2, the position detection circuit 16 generates a charging trigger signal, causing the wireless charging transmitter module 10 to provide power to the transmitting coil 6, further causing the transmitting coil 6 to generate electromagnetic coupling with the receiving coil 8, and providing power to the wireless charging receiver module 20 connected to the receiving coil 8.

[0074] In a specific embodiment of this utility model, when the position detection circuit 16 detects that the transmitting coil 6 has left the preset position inside the housing 2, the position detection circuit 16 generates a power-off trigger signal to cause the wireless charging transmitting module 10 to stop providing power to the transmitting coil 6, thereby preventing electromagnetic coupling between the transmitting coil 6 and the receiving coil 8.

[0075] In one specific embodiment of this utility model, the wireless charging device further includes a transmitting coil placement component 9 for placing the transmitting coil 6. In specific implementation, the transmitting coil placement component 9 is set on the charging rack and placed next to the wireless charging transmitting module 10, and is connected to the wireless charging transmitting module 10 via a cable 3. The cable 3 has a certain length and flexibility to provide sufficient space for the transmitting coil 6 to move backward, allowing the user to easily pull the transmitting coil 6 out of the housing 2 and put it back into the charging rack, and also to easily remove it and insert it into the housing 2.

[0076] In one specific embodiment of this utility model, the wireless charging transmitting module 10 includes a position detection circuit 16, a transmitting end control circuit 12, a transmitting end communication circuit 13, and a transmitting end charging circuit 11; the transmitting end control circuit 12 is connected to the position detection circuit 16, the transmitting end communication circuit 13, and the transmitting end charging circuit 11 respectively, and the transmitting end charging circuit 11 is connected to the transmitting coil 6; the wireless charging receiving module 20 includes a receiving end control circuit 22, a receiving end communication circuit 23, and a receiving end charging circuit 21; the receiving end control circuit 22 is connected to the receiving end communication circuit 23 and the receiving end charging circuit 21 respectively, and the receiving end charging circuit 21 is connected to the receiving coil 8; wherein, the transmitting end control circuit 12, the transmitting end communication circuit 13, the position detection circuit 16, and the transmitting end charging circuit 11 are set The wireless charging transmitter module 10 is integrated on the charging rack in the specific implementation process; some or all of the wireless charging receiver module 20 is placed inside or outside the housing 2; when the user needs to charge the electric vehicle waiting charging device, he only needs to remove the transmitter coil 6 from the transmitter coil placement piece 9 of the charging rack and insert it into the insertion port 7 of the housing 2. When the position detection circuit 16 detects that the transmitter coil 6 is inserted into the preset position inside the housing 2, the position detection circuit 16 generates a charging trigger signal. The charging trigger signal is transmitted to the transmitter control circuit 12. The transmitter control circuit 12 controls the transmitter charging circuit 11 to provide power to the transmitter coil 6, so that the transmitter coil 6 and the receiver coil 8 are electromagnetically coupled, and provide power to the receiver charging circuit 21 connected to the receiver coil 8. When the position detection circuit 16 detects that the transmitting coil 6 has slightly moved away from the preset position inside the housing 2, the position detection circuit 16 generates a power-off trigger signal and transmits it to the transmitting end control circuit 12. The transmitting end control circuit 12 controls the transmitting end charging circuit 11 to stop providing power to the transmitting coil 6, so that the transmitting coil 6 and the receiving coil 8 do not generate electromagnetic coupling, stop charging the battery, and ensure the safety of the user.

[0077] In one specific embodiment of this utility model, the transmitting end charging circuit 11 includes a charging interface, an inverter circuit, and a first resonant circuit connected in sequence; the first resonant circuit is connected to the transmitting coil 6 via a cable 3. The cable 3 has a certain length and flexibility, allowing the transmitting coil 6 to be removed or placed back on the charging rack, and has a certain amount of room for movement; in actual use, the charging interface is connected to the power supply 1;

[0078] The inverter circuit converts the DC power input at the charging interface into high-frequency AC power and transmits it to the first resonant circuit so that the high-frequency AC power is transmitted to the transmitting coil 6 to generate an electromagnetic field.

[0079] In one specific embodiment of this utility model, the wireless charging transmitter module 10 further includes a transmitter measurement circuit 14 and a transmitter protection circuit 15 connected to the transmitter control circuit 12;

[0080] Both the transmitter measurement circuit 14 and the transmitter protection circuit 15 are connected to the transmitter charging circuit 11.

[0081] The transmitter measurement circuit 14 is used to detect the charging parameters of the transmitter charging circuit 11 and send them to the transmitter control circuit 12. When the transmitter control circuit 12 determines that the transmitter charging circuit 11 is abnormal (such as overvoltage, overcurrent, or overtemperature) based on the charging parameters, it sends a control signal to the transmitter protection circuit 15, which then cuts off the DC power to the charging interface or stops the output of the inverter circuit. This not only ensures the convenience of charging but also guarantees the charging safety of users and vehicles, avoiding safety hazards caused by overvoltage, overcurrent, or overtemperature during charging, such as battery damage, power supply damage, or transmitter circuit damage.

[0082] In one specific embodiment of this utility model, the receiving end charging circuit 21 is located inside or outside the housing 2, and includes a second resonant circuit and a rectifier filter circuit connected in sequence. The second resonant circuit is connected to the receiving coil 8; the rectifier filter circuit is used to connect to the battery 30.

[0083] In one specific embodiment of this utility model, the wireless charging receiver module 20 further includes a receiver measurement circuit 24 and a receiver protection circuit 25 connected to the receiver control circuit 22; the receiver measurement circuit 24 and / or the receiver protection circuit 25 are disposed inside or outside the housing 2; wireless charging receiver module

[0084] Both the receiver measurement circuit 24 and the receiver protection circuit 25 are connected to the receiver charging circuit 21.

[0085] The receiving end measurement circuit 24 is used to detect the charging parameters of the receiving end charging circuit 21 and send them to the receiving end control circuit 22. When the receiving end control circuit 22 determines that the receiving end charging circuit 21 or the battery is abnormal (such as overvoltage, overcurrent, or overtemperature) based on the charging parameters, it sends a control signal to the receiving end protection circuit 25, which then stops the output of the rectifier and filter circuit. In specific implementation, if the battery has a battery management system (BMS) interface, the receiving end control circuit 22 can obtain the battery's charging parameters, battery ID, safe charging voltage and current, and real-time battery temperature through the connection with the battery BMS interface. During charging, the receiving end control circuit 22 communicates with the BMS and sends the data obtained from the BMS to the transmitting end control circuit 12. According to the requirements of the BMS, the transmitting end control circuit 12 controls the safe charging voltage and current. When the battery temperature exceeds the safe temperature, the receiving end protection circuit 25 stops the output of the rectifier and filter circuit. The battery ID and other battery parameters are also sent to the transmitter control circuit 12 via the communication module to authenticate the battery parameters and prevent charging of irregular, expired, mismatched or non-compliant batteries.

[0086] In one specific embodiment of this utility model, when the receiving end control circuit 22 determines that the receiving end charging circuit 21 is abnormal based on charging parameters, it also sends a control signal to the receiving end communication circuit 23. This control signal passes sequentially through the transmitting end communication circuit 13 and the transmitting end control circuit 12. The transmitting end control circuit 12 controls the transmitting end charging circuit 11 to stop providing power to the transmitting coil 6. This not only ensures charging convenience but also guarantees charging safety for users and vehicles, avoiding safety hazards caused by overvoltage, overcurrent, or overtemperature during charging, which could lead to battery damage or receiver circuit damage.

[0087] In one specific embodiment of this utility model, the wireless charging receiver module 20 further includes a receiver switch circuit 26, which is connected to the output terminal of the receiver protection circuit 25 and is disposed between the rectifier filter circuit and the battery.

[0088] When the receiver protection circuit 25 triggers protection, the receiver protection circuit 25 controls the receiver switching circuit 26 to operate, thereby disconnecting the physical connection between the rectifier filter circuit and the battery, so as to improve the safety performance of the wireless charging device.

[0089] In one specific embodiment of this utility model, the wireless charging transmitter module 10 further includes a transmitter charging status display module, and the wireless charging receiver module 20 further includes a receiver charging status display module.

[0090] The receiving end measurement circuit 24 is used to detect the charging parameters of the receiving end charging circuit 21 and send them to the receiving end control circuit 22. When the receiving end control circuit 22 determines that the receiving end charging circuit 21 is abnormal based on the charging parameters, it sends a status display signal to the receiving end charging status display module and also sends a status display signal to the receiving end communication circuit 23. The status display signal passes through the transmitting end communication circuit 13 and the transmitting end control circuit 12 in sequence before being sent to the transmitting end charging status display module. Different colored LEDs or LEDs with different flashing frequencies can be used to display different charging, standby, and abnormal states.

[0091] In one specific embodiment of this utility model, the wireless charging device further includes a position sensing circuit to assist the position detection circuit 16 in detecting whether the transmitting coil 6 has reached or left a preset position within the housing 2 when inserted into or removed from the housing 2. The position sensing circuit is located inside the transmitting coil 6 or the cover 5 and is connected to the position detection circuit 16. The position sensing circuit can be a proximity-type position sensing circuit, such as an electromagnetic, photoelectric, capacitive, or Hall effect type; it can also be a contact-type position sensing circuit, such as a mechanical switch.

[0092] In one specific embodiment of this utility model, part of the circuitry of the wireless charging receiver module 20 is placed inside the housing 2, while the remaining circuitry is placed outside the housing 2, for example, inside a vehicle body.

[0093] In one specific embodiment of this utility model, only the receiving coil is placed inside the housing 2, while all circuits in the wireless charging receiving module 20 are placed outside the housing 2, for example, inside the vehicle body.

[0094] In one specific embodiment of this utility model, both the receiving coil 8 and the wireless charging receiving module 20 are placed inside the vehicle housing 50. The housing 2, which has an insertion port 7, is placed outside the vehicle housing 50 but mounted on the vehicle housing 50, directly opposite the front face 82 of the receiving coil. The receiving coil 8 is close to the back of the housing 2. When the transmitting coil 6 is inserted into the housing 2 through the insertion port 7, the front face 80 of the transmitting coil and the front face 82 of the receiving coil inside the vehicle housing can be well matched. Furthermore, the vehicle housing between the housing 2 and the receiving coil 8 is made of non-metallic material.

[0095] In one specific embodiment of this utility model, the transmitting coil 6 is a transmitting coil containing only a protective shell. All circuits in the wireless charging transmitting module 10 are placed in one or more other modules and connected to the transmitting coil 6 via the cable 3. This reduces the weight and thickness of the transmitting coil 6.

[0096] In one specific embodiment of this utility model, all or part of the circuitry in the wireless charging transmitter module 10 is placed on the back side 81 of the transmitter coil and combined in a module with a protective shell, which is then inserted into the housing 2.

[0097] In one specific embodiment of this utility model, the insertion port 7 of the housing 2 is provided with a soft cover 40 made of a material with a certain elasticity and softness. In the specific implementation process, the soft cover 40 is installed on the upper part and around the insertion port 7. The soft cover 40 has a main opening 41 in the middle, which is aligned with and parallel to the center of the insertion port 7. The length of the main opening 41 is slightly larger than the length of the insertion port 7. Optionally, the soft cover 40 has multiple vertical openings 42 perpendicular to the main opening to increase the flexibility of the main opening 41. When the transmitting coil 6 is inserted into the insertion port 7, the main opening 41 will open due to the external force and the flexibility of the soft cover, without hindering the insertion of the transmitting coil 6. Because the soft cover is elastic, during the insertion of the transmitting coil 6, the main opening 41 can remove any foreign objects, dust, water droplets, etc., that may be attached to the transmitting coil 6. Foreign objects include metallic foreign objects. After the transmitting coil 6 is pulled out, the main opening 41 of the soft cover will naturally close due to its own elasticity, preventing foreign objects, dust, and water droplets from entering the housing 2. Therefore, the soft cover can effectively prevent metal foreign objects from entering the housing 2, and can also effectively remove metal foreign objects that may be brought in by the transmitting coil 6, reducing the requirements for metal foreign object detection, while ensuring the safety of charging.

[0098] In summary, the wireless charging device of this invention improves upon the shortcomings of traditional wireless charging systems, such as reduced charging efficiency and increased manufacturing costs due to coil misalignment. It also reduces the risk of damage to the charging system and charging safety caused by heat generated by foreign metal objects, and decreases electromagnetic radiation. Furthermore, this invention ensures charging safety, charging efficiency, and reduces overall costs.

[0099] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0100] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A wireless charging device, characterized in that: Includes a receiving coil, a housing, and a transmitting coil; The end of the housing is provided with an insertion port; Once the transmitting coil is fully inserted into the housing through the insertion port, the insertion port secures the transmitting coil. The transmitting coil and the receiving coil are directly opposite each other and in a matched state, and the gap and offset between them are less than or equal to a set threshold.

2. The wireless charging device according to claim 1, characterized in that: The sidewall of the insertion port is parallel to or at an angle to the front wall of the housing; after the transmitting coil is fully inserted into the interior of the housing from the insertion port, the transmitting coil is parallel to or at an angle to the front wall of the housing.

3. The wireless charging device according to claim 1, characterized in that: The inner wall of the housing is provided with a sliding groove corresponding to the insertion port. The sliding groove is parallel to or at an angle to the front wall of the housing and is used to accommodate and fix the transmitting coil.

4. A wireless charging device according to claim 2 or 3, characterized in that: The included angle is ±15°~60°.

5. A wireless charging device according to claim 1, characterized in that: The insertion port is located at the top of the housing; the bottom of the housing has a hollow structure or an opening.

6. A wireless charging device according to claim 1, characterized in that: The transmitting coil has a cover that closes the insertion port on the housing after the transmitting coil has fully entered the housing from the insertion port.

7. A wireless charging device according to claim 1, characterized in that: The wireless charging device also includes a transmitter coil holder for holding the transmitter coil.

8. A wireless charging device according to claim 1, characterized in that: The sidewalls of the housing are provided with electromagnetic shielding material or metal material.

9. A wireless charging device according to claim 8, characterized in that: The electromagnetic shielding material is a ferrite soft magnetic material, an amorphous nanocrystalline material, or an alloy soft magnetic material.

10. A wireless charging device according to claim 1, characterized in that: The receiving coil is placed inside or outside the housing.

11. A wireless charging device according to claim 1 or 10, characterized in that: The wireless charging device further includes a wireless charging transmitter module and a wireless charging receiver module; the wireless charging transmitter module includes a position detection circuit. When the position detection circuit detects that the transmitting coil is inserted into a preset position inside the housing, the position detection circuit generates a charging trigger signal, which causes the wireless charging transmitting module to provide power to the transmitting coil, and further causes the transmitting coil to generate electromagnetic coupling with the receiving coil, and provides power to the wireless charging receiving module connected to the receiving coil.

12. A wireless charging device according to claim 11, characterized in that: When the position detection circuit detects that the transmitting coil has left the preset position inside the housing, the position detection circuit generates a power-off trigger signal to cause the wireless charging transmitting module to stop providing power to the transmitting coil, thereby preventing electromagnetic coupling between the transmitting coil and the receiving coil.

13. A wireless charging device according to claim 11, characterized in that: The wireless charging receiver module is partially or entirely located inside or outside the housing.

14. A wireless charging device according to claim 11, characterized in that: The wireless charging transmitter module is partially or entirely located on the back of the transmitter coil.

15. A wireless charging device according to claim 11, characterized in that: The wireless charging device also includes a position sensing circuit to help the position detection circuit detect whether the transmitting coil has reached or left a preset position inside the housing when it is inserted into or removed from the housing.

16. A wireless charging device according to claim 15, characterized in that: The position sensing circuit is placed inside the transmitting coil or inside a cover connected to the transmitting coil, and is connected to the position detection circuit.

17. A wireless charging device according to claim 11, characterized in that: Both the receiving coil and the wireless charging receiving module are placed inside the housing of the device to be charged. The housing with the insertion port is placed outside the housing of the device to be charged, but is installed on the housing of the device to be charged, facing the front of the receiving coil. The receiving coil is close to the back of the housing. When the transmitting coil is inserted into the housing through the insertion port, the front of the transmitting coil and the front of the receiving coil inside the device to be charged can match well.

18. A wireless charging device according to claim 1, characterized in that: A soft cover made of a material with a certain degree of elasticity and softness is installed on the housing near the insertion port. The soft cover has a main opening, the length of which is slightly greater than the length of the insertion port. When the transmitting coil is inserted into the insertion port, the main opening of the soft cover will open; When the transmitting coil is pulled out of the insertion port, the main opening of the soft cover will naturally close due to its own elasticity.

19. A wireless charging device according to claim 18, characterized in that: The soft cover has multiple vertical openings that are perpendicular to the main opening of the soft cover.

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