Wireless charging apparatus

Abstract

Disclosed is a wireless charging apparatus, comprising a receiving coil (8), a housing (2), and a transmitting coil (6); an insertion opening is provided at an end of the housing; when the transmitting coil has fully entered the interior of the housing through the insertion opening, the insertion opening fixes the transmitting coil in place, the transmitting coil directly faces and is in a matched state with the receiving coil, and the gap and offset between the two are less than or equal to a set threshold. The wireless charging apparatus can not only reduce coil misalignment during charging and reduce the coil surface area, but can also reduce the need for foreign object detection and reduce electromagnetic radiation, thereby ensuring charging efficiency while also ensuring charging safety and reducing the manufacturing cost of the charging apparatus.

Description

Wireless charging device TECHNICAL FIELD

[0001] The present application belongs to the technical field of wireless charging, and particularly relates to a wireless charging device, which is suitable for, but not limited to, electric bicycle or scooter. BACKGROUND

[0002] The traditional wired charging of electric bicycle, electric bicycle or scooter has many safety hazards, such as the use of non-compliant, non-matching or low-quality chargers by users, wear and tear of cables, damage of cables due to stretching, poor contact with the interface of the battery, and the exposed plug being prone to moisture and short circuit, etc., which increases the risk of safety hazards such as fire caused by overload, short circuit, poor quality, electric shock and sparking. Since it is difficult to regulate users and check the wired charging equipment and charging cables and plugs used by users, such safety hazards are difficult to eliminate. In addition, wired charging is also not very convenient in operation, requiring users to manually plug and unplug, especially in rainy or extreme weather. In contrast, the use of wireless charging technology can effectively solve these problems. Wireless charging technology transmits energy through electromagnetic induction between the transmitting end and the receiving end, thereby achieving charging of the vehicle without direct wire connection. Since wireless charging technology does not require physical contact, it can improve the waterproofness and dustproofness of the charging device. Wireless charging not only solves the risk of electric shock caused by physical contact, but also prevents users from using their own wired chargers, thereby fundamentally eliminating the safety hazards mentioned above due to non-compliant or unsafe wired chargers, greatly improving the safety of charging, and also making the charging process more convenient and improving the user experience. At the same time, wireless charging has the advantages of waterproofness and dustproofness since the coil and circuit can be completely enclosed in the shell, thereby increasing the safety of outdoor charging.

[0003] The existing wireless charging of electric bicycles usually installs the receiving coil at a certain part of the electric bicycle. When the vehicle is parked, the transmitting coil and the receiving coil are aligned within a certain range. In this way, without contact, the receiving coil obtains electric energy through the electromagnetic field generated by the transmitting coil and the electromagnetic induction between the transmitting coil and the receiving coil, and charges the vehicle through the connected circuit. When the vehicle is parked in the designated wireless area, the charging system will automatically detect and start working without the need for the user to manually plug and unplug the cable. Although this charging method brings a lot of convenience, it also has some disadvantages, mainly including:

[0004] 1. Misalignment of transmitting coil and receiving coil: The wireless charging system relies on the alignment of the receiving coil of the electric bicycle with the opposite transmitting coil. If the vehicle is parked with deviation and angle, the alignment deviation or spacing between the coils will increase, which will result in reduced charging efficiency and increased energy loss and heating.

[0005] 2. Metal foreign body heating: During the charging process, due to the possible large gap between the transmitting coil and the receiving coil, when metal foreign bodies exist between the two coils, these metal foreign bodies will generate eddy currents from the magnetic field, thereby heating.

[0006] Foreign object detection requires the integration of high-precision sensors and complex detection algorithms to avoid foreign object interference causing damage and safety risks to the charging system. At the same time, the accuracy and reliability of foreign object detection are difficult to guarantee. Especially during the charging process, it is extremely challenging to detect the introduction of small metal foreign bodies.

[0007] 3. In order to ensure a certain degree of freedom for the vehicle to be parked, including a certain lateral offset range and a certain longitudinal gap range, 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, which requires increasing the current and area of the transmitting coil, thereby increasing the strength and range of electromagnetic radiation. Electromagnetic radiation includes radiation to the human body or living things around the coil, as well as electromagnetic interference to the surrounding electronic equipment. In order to ensure the freedom of the vehicle to be parked, it is difficult to add structural members with electromagnetic shielding materials around the coil.

[0008] 4. In order to avoid the problem of reduced charging efficiency caused by coil misalignment and charging distance, the charging system needs to increase the area of the coil to expand the charging area and ensure a certain coupling coefficient, thus increasing the material cost and installation cost.

[0009] It can be seen that these shortcomings not only increase the design and manufacturing cost of the equipment, but also have potential safety problems caused by electromagnetic radiation and metal foreign bodies, thus facing certain challenges in the popularization of wireless charging technology. SUMMARY

[0010] In view of the above problems, the present application provides a wireless charging device which can not only reduce coil misalignment during charging, reduce the need for foreign object detection, but also greatly reduce electromagnetic radiation, thereby ensuring charging efficiency, safety and reducing the manufacturing cost of the charging system.

[0011] At the same time, it can also remove the user's own wired charger, and fundamentally eliminate the safety hazards of wired charging.

[0012] In order to achieve the above technical purposes and achieve the above technical effects, the present application is implemented by the following technical solutions:

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

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

[0015] When the transmitting coil is completely inserted into the inside of the shell from the insertion port, the insertion port fixes the transmitting coil, the transmitting coil is opposite to the receiving coil and is in a matching state, and the gap and offset between the two are less than or equal to a set threshold.

[0016] Optionally, the side wall of the insertion port is parallel to or has an included angle with the front wall of the shell; when the transmitting coil is completely inserted into the inside of the shell from the insertion port, the transmitting coil is parallel to or has an included angle with the front wall of the shell.

[0017] Optionally, a sliding groove corresponding to the insertion port is arranged on the inner wall of the shell, and the sliding groove is parallel to or has an included angle with the front wall of the shell, and is used for accommodating and fixing the transmitting coil.

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

[0019] Optionally, the insertion port is located at the top of the shell; and the bottom of the shell is a hollow structure or is provided with an opening.

[0020] Optionally, the transmitting coil is provided with a cover, and when the transmitting coil is completely inserted into the inside of the shell from the insertion port, the cover closes the insertion port on the shell.

[0021] Optionally, the wireless charging device further comprises a transmitting coil placing member for placing the transmitting coil.

[0022] Optionally, the side wall of the shell is provided with an electromagnetic shielding material or a 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 arranged inside or outside the shell.

[0025] Optionally, the wireless charging device further comprises a wireless charging transmitting module and a wireless charging receiving module; the wireless charging transmitting module comprises a position detection circuit.

[0026] When the position detection circuit detects that the transmitting coil is inserted into a preset position in the shell, the position detection circuit generates a charging trigger signal to enable the wireless charging transmitting module to provide electric energy for the transmitting coil, further to enable the transmitting coil to generate electromagnetic coupling with the receiving coil, and to provide electric energy for the wireless charging receiving module connected with the receiving coil.

[0027] Optionally, when the position detection circuit detects that the transmitting coil is away from the preset position in the shell, the position detection circuit generates a power-off trigger signal to make the wireless charging transmitting module stop providing power for the transmitting coil, and further make the transmitting coil not generate electromagnetic coupling with the receiving coil.

[0028] Optionally, the wireless charging receiving module is partially or entirely arranged inside or outside the shell.

[0029] Optionally, the wireless charging transmitting module is partially or entirely arranged behind the transmitting coil.

[0030] Optionally, the wireless charging device further comprises a position sensing circuit, which is used to help the position detection circuit detect whether the transmitting coil reaches or leaves the preset position in the shell when the transmitting coil is inserted into or pulled out of the shell.

[0031] Optionally, the position sensing circuit is arranged in the transmitting coil or a cover connected with the transmitting coil, and is connected with the position detection circuit.

[0032] Optionally, the receiving coil and the wireless charging receiving module are arranged in the shell of the device to be charged, the shell provided with the insertion opening is arranged outside the shell of the device to be charged but is mounted on the shell of the device to be charged and faces the front surface of the receiving coil, and the receiving coil is close to the back surface of the shell, so that the front surface of the transmitting coil and the front surface of the receiving coil in the device to be charged can be well matched when the transmitting coil is inserted into the shell through the insertion opening.

[0033] Optionally, a soft cover made of material with elasticity and softness is arranged on the shell near the insertion opening, and the soft cover is provided with a soft cover main opening, and the length of the soft cover main opening is slightly greater than the length of the insertion opening.

[0034] When the transmitting coil is inserted into the insertion opening, the soft cover main opening is opened.

[0035] When the transmitting coil is pulled out of the insertion opening, the soft cover main opening is naturally closed due to the elasticity of the soft cover.

[0036] Optionally, the soft cover is provided with a plurality of vertical openings perpendicular to the soft cover main opening.

[0037] Compared with the prior art, the present application has the following beneficial effects:

[0038] The present application provides a wireless charging device, which can not only reduce the misalignment of coils during charging, but also reduce the demand for foreign object detection and greatly reduce electromagnetic radiation, so as to ensure the charging efficiency, charging safety and the manufacturing cost of the charging system.

[0039] The gap between the transmitting coil and the receiving coil in the application can be very close (<5mm), and has a strong coupling, so that a small area of the coil can provide and receive the designed power.

[0040] The application charges by inserting the transmitting coil into the gap on the side of the receiving coil, and the insertion port on the shell is at an angle between the front wall of the shell, so the position of the transmitting coil can slide to the bottom and close to the receiving coil due to gravity, and the gap and relative position of the receiving coil are basically fixed, leaving a small margin (a few millimeters) for insertion and removal, and the misalignment can be basically eliminated, and the coupling coefficient is strong, so that the area of the transmitting coil does not need to be increased, and the smaller transmitting coil has smaller volume and weight, and also ensures the convenience of insertion and placement. At the same time, the strong coupling coefficient and the small coil area also reduce the strength and range of electromagnetic radiation.

[0041] The insertion port in the application is provided on the top of the shell (and the opening faces upward), so that the user can more conveniently take the transmitting coil and insert it into the shell for charging the electric vehicle.

[0042] The transmitting coil in the application has a cover, which closes the insertion port on the shell after the transmitting coil is inserted, so that the entry of foreign matter can be avoided. Therefore, foreign matter detection only needs to be detected before charging, and there is no need to detect foreign matter during charging, which greatly reduces the difficulty of foreign matter detection. At the same time, if foreign matter enters the insertion port when not charging, the hollow design or opening design at the bottom of the shell and the installation angle can also make the foreign matter slide out.

[0043] When the position detection circuit in the application detects that the transmitting coil is inserted in place, a trigger signal is sent to the wireless charging transmitting module, so that the wireless charging transmitting module provides power to the transmitting coil. When the transmitting coil is slightly pulled out by external force, the position detection circuit sends a trigger signal to the wireless charging transmitting module, so that the wireless charging transmitting module stops providing power to the transmitting coil, ensuring the safety of use.

[0044] The application also provides a transmitting coil placing piece, which is used for mounting on the charging rack, so that the user can conveniently place the transmitting coil back to the charging rack, and also can conveniently take out and insert into the receiving shell. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative labor, wherein:

[0046] Fig. 1 is a principle block diagram of a wireless charging device according to an embodiment of the application.

[0047] Fig. 2 is a front side view of a wireless charging device according to an embodiment of the present application;

[0048] Fig. 3 is a rear side view of a wireless charging device according to an embodiment of the present application;

[0049] Fig. 4 is a side view of a wireless charging device according to an embodiment of the present application in a charging state;

[0050] Fig. 5 is a schematic view of an internal structure of a wireless charging device according to an embodiment of the present application in a charging state;

[0051] Fig. 6 is a schematic view of a wireless charging device according to an embodiment of the present application in a charging state;

[0052] Fig. 7 is a side view of a wireless charging device according to an embodiment of the present application;

[0053] Fig. 8 is a structural view of a soft cover according to an embodiment of the present application;

[0054] wherein:

[0055] 1 - power supply, 2 - housing, 3 - cable, 4 - bottom of the housing, 5 - cover, 6 - transmitting coil, 7 - insertion port, 8 - receiving coil, 9 - transmitting coil placement, 10 - wireless charging transmitting module, 11 - transmitting end charging circuit, 12 - transmitting end control circuit, 13 - transmitting end communication circuit, 14 - transmitting end measurement circuit, 15 - transmitting end protection circuit, 16 - position detection circuit, 20 - wireless charging receiving module, 21 - receiving end charging circuit, 22 - receiving end control circuit, 23 - receiving end communication circuit, 24 - receiving end measurement circuit, 25 - receiving end protection circuit, 26 - receiving end switching circuit, 30 - battery, 40 - soft cover, 41 - main opening of the soft cover, 42 - vertical opening, 50 - housing of the vehicle, 70 - included angle, 71 - front wall of the housing, 72 - side wall of the insertion port, 80 - front surface of the transmitting coil, 81 - back surface of the transmitting coil, 82 - front surface of the receiving coil, 83 - back surface of the receiving coil. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting on the application or its applications or uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0057] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the 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 invention, "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 invention, 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 the invention. 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 the present invention will be described in detail below with reference to the accompanying drawings.

[0061] As shown in Figures 1-6, the present invention 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 the present invention, the sidewall 72 of the insertion port 7 is parallel to or at an angle 70 to the front wall 71 of the housing 2; after the transmitting coil 6 is fully inserted into the housing 2 from 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 the present invention, 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 by making the sidewall 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, and 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 to 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 the present invention, 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 the present invention, 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 to 60°. This angle helps the transmitting coil 6 to naturally come into close contact with 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 the present invention, 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 the present invention, 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 the present invention, some or all of the sidewalls of the housing 2 may be fitted with electromagnetic shielding material or metallic 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 may 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 metallic material may be copper, aluminum, stainless steel, etc.

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

[0073] In one specific embodiment of the present invention, the wireless charging device further includes a wireless charging transmitting module 10 and a wireless charging receiving module 20; the wireless charging transmitting module 10 is connected to the transmitting coil 6 via a cable 3. During charging, the AC power generated by the wireless charging transmitting module 10 is transmitted to the transmitting coil 6 via the cable 3. The wireless charging receiving module 20 is connected to a receiving coil 8. The electrical energy sensed by the receiving coil 8 is transmitted to the wireless charging receiving module 20. The wireless charging transmitting 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 within the housing 2, the position detection circuit 16 generates a charging trigger signal, causing the wireless charging transmitting module 10 to provide power to the transmitting coil 6, further causing the transmitting coil 6 to electromagnetically couple with the receiving coil 8, and providing power to the wireless charging receiving module 20 connected to the receiving coil 8.

[0074] In a specific embodiment of the present invention, when the position detection circuit 16 detects that the transmitting coil 6 has left a 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 the present invention, 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 disposed 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 a specific embodiment of the present invention, the wireless charging transmitter module 10 includes a position detection circuit 16, a transmitter control circuit 12, a transmitter communication circuit 13, and a transmitter charging circuit 11; the transmitter control circuit 12 is connected to the position detection circuit 16, the transmitter communication circuit 13, and the transmitter charging circuit 11, respectively, and the transmitter charging circuit 11 is connected to the transmitter coil 6; the wireless charging receiver module 20 includes a receiver control circuit 22, a receiver communication circuit 23, and a receiver charging circuit 21; the receiver control circuit 22 is connected to the receiver communication circuit 23 and the receiver charging circuit 21, respectively, and the receiver charging circuit 21 is connected to the receiver coil 8; wherein, the transmitter control circuit 12, the transmitter communication circuit 13, the position detection circuit 16, and the transmitter charging circuit 11 are placed in... Outside the housing 2; In specific implementation, the wireless charging transmitter module 10 is integrated on the charging rack; 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 the present invention, the transmitter 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 transmitter coil 6 via a cable 3. The cable 3 has a certain length and flexibility, allowing the transmitter 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 the present invention, 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 the present invention, the receiving end charging circuit 21 is disposed 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 the present invention, 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; the 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 the present invention, 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 the convenience of charging but also guarantees the charging safety of the user and the vehicle, avoiding safety hazards caused by overvoltage, overcurrent, or overtemperature during charging, which could lead to battery damage or damage to the receiving end circuit.

[0087] In one specific embodiment of the present invention, 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 the present invention, 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 the present invention, 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; the position sensing circuit can also be a contact-type position sensing circuit, such as a mechanical switch.

[0092] In one specific embodiment of the present invention, 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 the present invention, 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 the present invention, both the receiving coil 8 and the wireless charging receiving module 20 are housed inside the vehicle housing 50. The housing 2, equipped with an insertion port 7, is located outside the vehicle housing 50 but mounted on it, 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 match well. Furthermore, the vehicle housing between the housing 2 and the receiving coil 8 is made of a non-metallic material.

[0095] In one specific embodiment of the present invention, the transmitting coil 6 is a transmitting coil containing only a protective casing. All circuitry in the wireless charging transmitting module 10 is housed in one or more other modules and connected to the transmitting coil 6 via cable 3. This reduces the weight and thickness of the transmitting coil 6.

[0096] In one specific embodiment of the present invention, 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 the present invention, the insertion port 7 of the housing 2 is provided with a soft cover 40 made of a material with a certain degree of 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 present on 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 cost.

[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 to facilitate the description of the present invention and to simplify 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 the present invention.

[0100] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention 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° to 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 transmitter coil is inserted into a preset position inside the housing, the position detection circuit generates a charging trigger signal to enable the wireless charging transmitter module to provide power to the transmitter coil, further enabling the transmitter coil to generate electromagnetic coupling with the receiver coil, and providing power to the wireless charging receiver module connected to the receiver 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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