Wireless charging device

Abstract

The invention discloses a wireless charging device which comprises a receiving coil, a receiving coil shell, a transmitting coil, a transmitting coil shell and a connecting piece. The receiving coil is arranged in the receiving coil shell; the transmitting coil is arranged in the transmitting coil shell; when the transmitting coil shell is moved to the receiving coil shell and the transmitting coil shell and the receiving coil shell are aligned to a preset position through the connecting piece, 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 charging device, coil dislocation during charging can be reduced, the coil area can be reduced, the requirement for foreign matter detection can be lowered, electromagnetic radiation can be reduced, and therefore charging safety is guaranteed while charging efficiency is guaranteed, and the manufacturing cost of the charging device is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless charging, and particularly relates to a wireless charging device, which is applicable to but not limited to battery cars, electric bicycles, scooters, etc. Background Art

[0002] There are many safety hazards in the traditional wired charging of battery cars, electric bicycles or scooters. For example, users use non-compliant, mismatched or low-quality chargers, cable wear, cable stretching and entanglement resulting in damage, poor contact with the battery interface, and exposed plugs are prone to moisture short circuit, etc., increasing the risk of safety hazards such as fires caused by overload, short circuit, poor quality, electric shock and sparking. Since it is difficult to regulate users and inspect the wired charging equipment, charging cables and plugs used by users, such safety hazards are difficult to eliminate. In addition, wired charging is not very convenient in operation and requires users to manually plug and unplug, especially inconvenient in rainy or extreme weather. In contrast, using wireless charging technology can effectively solve these problems. Wireless charging technology transmits energy through electromagnetic induction between the transmitting end and the receiving end, so that the vehicle can be charged without direct wire connection. Since wireless charging technology does not require physical contact, the waterproof and dustproof performance of the charging device can be improved. Wireless charging not only solves the electric shock risk brought by physical contact, but also users cannot use their own wired chargers, fundamentally eliminating the above-mentioned safety hazards caused by non-compliant or unsafe wired chargers of users, greatly improving the charging safety, and also making the charging process more convenient and enhancing the user experience. At the same time, wireless charging has the advantages of waterproof and dustproof because the coil and circuit can be completely enclosed in the shell, increasing the safety of outdoor charging.

[0003] In the existing wireless charging of battery cars, the receiving coil 10 is usually installed at a certain part of the battery car. When the vehicle stops, the transmitting coil 8 and the receiving coil 10 will be aligned within a certain range. In this way, without contact, an electromagnetic field is generated by the transmitting coil 8, and through the electromagnetic induction between the transmitting coil 8 and the receiving coil 10, the receiving coil 10 obtains electrical energy 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 users to manually plug and unplug the cable. Although this charging method brings a lot of convenience, there are also some disadvantages, mainly including: 1. Misalignment between the transmitting coil 8 and the receiving coil: The wireless charging system depends on the alignment of the receiving coil 10 of the battery car with the facing transmitting coil 8. If the vehicle is parked with deviation and angle, the alignment deviation or spacing between the coils will increase, which will lead to a decrease in charging efficiency, thus increasing energy loss and heat generation.

[0004] 2. Heat generation of metallic foreign objects: During the charging process, due to the possible large gap between the transmitting coil 8 and the receiving coil 10, when metallic foreign objects exist between the two coils, these metallic foreign objects will generate eddy currents from the magnetic field, thus generating heat.

[0005] Foreign object detection requires integrating high-precision sensors and complex detection algorithms to avoid the risks of damage and safety to the charging system caused by foreign object interference. At the same time, it is very difficult to ensure the accuracy and reliability of foreign object detection. Especially during the charging process, it is extremely challenging to detect the introduction of small metallic foreign objects.

[0006] 3. To ensure a certain degree of freedom for vehicle parking, including having a certain lateral offset range and a certain longitudinal clearance range, the vertical clearance between the coils is relatively large. Coupled with the offset of the centers of the two coils, the coupling coefficient of the coils will become smaller. This requires increasing the current and area of the transmitting coil 8, thereby increasing the intensity and range of electromagnetic radiation. Electromagnetic radiation includes radiation to the human body or living things around the coils, as well as electromagnetic interference to surrounding electronic devices. For the freedom of vehicle parking, it is also very difficult to install structural components with electromagnetic shielding materials around the coils.

[0007] 4. 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 coils to expand the charging area and ensure a certain coupling coefficient, and the material cost and installation cost of the materials also increase accordingly.

[0008] It can be seen that these disadvantages not only increase the design and manufacturing costs of the equipment, but also have potential safety problems caused by electromagnetic radiation and metallic foreign objects. Therefore, there are certain challenges in the popularization of wireless charging technology. Summary of the Invention

[0009] In view of the above problems, the present invention proposes 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 safety and reducing the manufacturing cost of the charging system while ensuring charging efficiency.

[0010] At the same time, it can also remove the wired charger provided by the user, fundamentally eliminating the safety hazards of wired charging.

[0011] To achieve the above technical objectives and achieve the above technical effects, the present invention is realized through the following technical solutions: A wireless charging device includes a receiving coil, a receiving coil housing, a transmitting coil, a transmitting coil housing, and a connecting member; The receiving coil is arranged inside the receiving coil housing; The transmitting coil is arranged inside the transmitting coil housing; When the transmitting coil housing is moved to the receiving coil housing and the transmitting coil housing and the receiving coil housing are aligned to the preset position through the connecting member, the transmitting coil and the receiving coil face each other and are in a matching state, and the gap and offset between the transmitting coil and the receiving coil are less than or equal to a set threshold value.

[0012] Optionally, the connecting member is provided on the receiving coil housing.

[0013] Optionally, the connecting member includes an independently provided first frame and a first support plate, both of which are provided on the side of the receiving coil housing for aligning with the transmitting coil housing, and the first support plate is located below the first frame; both the top and bottom of the first frame are open structures; When the transmitting coil housing is inserted into the top opening of the first frame, under the action of gravity, the transmitting coil housing slides along the first frame until it contacts the first support plate, then the transmitting coil housing and the receiving coil housing are aligned to the preset position.

[0014] Optionally, the first support plate is provided with an opening or a hollow structure.

[0015] Optionally, the connecting member includes a mutually cooperating first connecting portion and a second connecting portion, and the first connecting portion and the second connecting portion are respectively provided on the transmitting coil housing and the receiving coil housing.

[0016] Optionally, the first connecting portion and the second connecting portion are respectively a transmitting end magnet module and a receiving end magnet module, and the two attract each other.

[0017] Optionally, both the first connecting portion and the second connecting portion are provided inside the transmitting coil housing and the receiving coil housing.

[0018] Optionally, the first connecting portion is a sliding groove; the second connecting portion includes a second frame and a second support plate; The sliding groove is provided on the outer wall of the transmitting coil housing; The second frame and the second support plate are both provided on the side of the receiving coil housing for aligning with the transmitting coil housing, and the second support plate is located below the second frame; both the top and bottom of the second frame are open structures; When the lower end of the sliding groove is engaged with the upper end of the second frame, under the action of gravity, the transmitting coil housing slides along the second frame until it contacts the second support plate, then the transmitting coil housing and the receiving coil housing are aligned to the preset position.

[0019] Optionally, the second support plate is provided with an opening or a hollow structure.

[0020] Optionally, the first connecting part is a buckle, which is arranged at the top of the transmitting coil housing; the second connecting part is a clamping groove, which is arranged at the top of the receiving coil housing; When the buckle on the transmitting coil housing is snapped into the clamping groove on the receiving coil housing, the transmitting coil housing and the receiving coil housing are aligned to a preset position.

[0021] Optionally, the wireless charging device further includes a wireless charging transmitting module and a wireless charging receiving module; the wireless charging transmitting module includes a position detection circuit; When the position detection circuit detects that the transmitting coil housing and the receiving coil housing are aligned to a preset position, the position detection circuit generates a charging trigger signal to enable the wireless charging transmitting module to supply power to the transmitting coil, further enabling the transmitting coil and the receiving coil to generate electromagnetic coupling and supply power to the wireless charging receiving module connected to the receiving coil.

[0022] Optionally, when the position detection circuit detects that the transmitting coil housing and the receiving coil housing are not aligned to a preset position, the position detection circuit generates a power-off trigger signal to enable the wireless charging transmitting module to stop supplying power to the transmitting coil, further preventing the transmitting coil and the receiving coil from generating electromagnetic coupling.

[0023] Optionally, the wireless charging device further includes a position sensing circuit, which is placed inside the transmitting coil housing and connected to the position detection circuit, and is used to detect whether the positions of the transmitting coil and the receiving coil match and send a signal to the position detection circuit to help the position detection circuit detect whether the transmitting coil housing and the receiving coil housing are aligned to a preset position.

[0024] Optionally, the wireless charging device further includes a human body sensing circuit, which is placed inside the transmitting coil housing and connected to the wireless charging transmitting module; when a certain part of the human body touches the transmitting coil housing, the human body sensing circuit generates a trigger signal, which is transmitted to the wireless charging transmitting module to enable the wireless charging transmitting module to stop supplying power to the transmitting coil.

[0025] Optionally, the transmitting coil housing has a transmitting fitting surface; the receiving coil housing has a receiving fitting surface; the transmitting coil includes a transmitting coil front and a transmitting coil back that are oppositely arranged; the receiving coil includes a receiving coil front and a receiving coil back that are oppositely arranged; The transmitting coil front is parallel to the transmitting fitting surface, and the gap between the two is less than a set second threshold; The receiving coil front is parallel to the receiving fitting surface, and the gap between the two is less than a set third threshold; When the transmitting mating surface and the receiving mating surface are aligned to the preset through the connecting member, the front surface of the transmitting coil is directly opposite to the front surface of the receiving coil and in a matching state.

[0026] Optionally, the value ranges of the second threshold and the third threshold are both 2 to 4 mm.

[0027] Optionally, the receiving coil housing is placed inside the housing of the device to be charged, the receiving mating surface is attached to the inner side of the housing of the device to be charged, and the connecting member is installed on the outer side of the housing of the device to be charged; when the transmitting coil housing is moved to the device to be charged, through the installation of the connecting member, the transmitting mating surface of the transmitting coil housing and the receiving mating surface of the receiving coil can be well attached and well aligned to the preset, the front surface of the transmitting coil is directly opposite to the front surface of the receiving coil and in a matching state, and there is a layer of the housing of the device to be charged between the transmitting mating surface and the receiving mating surface of the receiving coil, and the housing of the device to be charged between the transmitting mating surface and the receiving mating surface of the receiving coil is made of a non-metallic material.

[0028] Optionally, electromagnetic shielding materials or metallic materials are added to some or all of the side walls of the receiving coil housing and the transmitting coil housing.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a wireless charging device, which can not only reduce the coil misalignment during charging, but also reduce the need for foreign object detection and greatly reduce electromagnetic radiation, thereby ensuring charging safety and reducing the manufacturing cost of the charging system while ensuring charging efficiency.

[0030] In the present invention, the gap between the transmitting coil and the receiving coil can be very close (such as <5 mm), with strong coupling, so that a very small area of the coil can provide and receive the designed power.

[0031] In the present invention, when the transmitting coil housing with a transmitting coil inside and the receiving coil housing with a receiving coil inside are aligned to the preset through the connecting member, the transmitting coil and the receiving coil are directly opposite and in a matching state, and the gap and offset between the transmitting coil and the receiving coil are less than or equal to the set threshold, and the misalignment can be basically eliminated, with a strong coupling coefficient. Therefore, there is no need to increase the area of the transmitting coil, and the smaller transmitting coil has a smaller volume and weight, and also ensures the convenience of insertion and placement back in place. At the same time, the strong coupling coefficient and the small coil area also reduce the intensity and range of electromagnetic radiation.

[0032] The present invention provides specific structures of various connecting members, making it more convenient for users to pick up the transmitting coil 8 and insert it into the housing to charge devices such as electric vehicles.

[0033] When the position detection circuit in the present invention detects that the transmitting coil housing and the receiving coil housing are aligned to the preset position through the connecting member, it will send a trigger signal to the wireless charging transmitting module, so that the wireless charging transmitting module provides electrical energy to the transmitting coil 8. When the transmitting coil housing is slightly pulled out by an external force, the position detection circuit will send a trigger signal to the wireless charging transmitting module to make the wireless charging transmitting module stop providing electrical energy to the transmitting coil, ensuring the safety of use. Brief Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where: Figure 1 It is a schematic diagram of the overall structure of a wireless charging device according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the principle of a wireless charging device according to an embodiment of the present invention; Figure 3 It is one of the schematic diagrams of the structure of a connecting member according to an embodiment of the present invention; Figure 4 It is another schematic diagram of the structure of a connecting member according to an embodiment of the present invention; Figure 5 It is a third schematic diagram of the structure of a connecting member according to an embodiment of the present invention; Figure 6 It is a fourth schematic diagram of the structure of a connecting member according to an embodiment of the present invention; Figure 7 It is a schematic diagram of the front and back of the coil and the fitting surface of the housing according to an embodiment of the present invention; Wherein: 1 - Power supply, 2 - Transmitting coil housing, 3 - Front side of the transmitting coil, 4 - Back side of the transmitting coil, 5 - Receiving coil housing, 6 - Front side of the receiving coil, 7 - Back side of the receiving coil, 8 - Transmitting coil, 9 - Transmitting bonding surface, 10 - Receiving coil, 11 - Receiving bonding surface, 12 - Cable, 13 - Placement part for the transmitting coil 8, 20 - Wireless charging transmitting module, 21 - Charging circuit at the transmitting end, 22 - Control circuit at the transmitting end, 23 - Communication circuit at the transmitting end, 24 - Measuring circuit at the transmitting end, 25 - Protection circuit at the transmitting end, 26 - Position sensor circuit, 27 - Human body sensing circuit, 40 - Wireless charging receiving module, 41 - Charging circuit at the receiving end, 42 - Control circuit at the receiving end, 43 - Communication circuit at the receiving end, 44 - Measuring circuit at the receiving end, 45 - Protection circuit at the receiving end, 46 - Switching circuit at the receiving end, 47 - Position detection circuit, 50 - Battery, 60 - Transmitting end magnet module, 61 - Receiving end magnet module, 70 - Buckle, 71 - Card slot, 80 - First frame, 81 - First support plate, 90 - Slide groove, 91 - Second frame, Second support plate. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the sake of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may also include different values. It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0037] In the description of the present invention, "several" means more than one, "multiple" means more than two, and understandings such as "greater than", "less than", and "exceeding" do not include the corresponding number, while understandings such as "above", "below", and "within" include the corresponding number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features or implicitly specifying the sequence relationship of the indicated technical features.

[0038] In the description of the present invention, descriptions with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0039] The following describes in detail the application principle of the present invention with reference to the accompanying drawings. Embodiment 1

[0040] In an embodiment of the present invention, a wireless charging device is provided, as Figure 1 shown, including a receiving coil 10, a receiving coil housing 5, a transmitting coil 8, a transmitting coil housing 2, and a connecting member; Both the transmitting coil housing 2 and the receiving coil housing 5 are of a fully enclosed design; The receiving coil 10 is disposed inside the receiving coil housing 5; in a specific implementation process, the receiving coil housing 5 can be set to have good electrical insulation characteristics and a certain mechanical strength for protecting the receiving coil 10 disposed inside it and the possibly built-in circuit; The transmitting coil 8 is disposed inside the transmitting coil housing 2; in a specific implementation process, the transmitting coil housing 2 can be set to have good electrical insulation characteristics and a certain mechanical strength for protecting the transmitting coil 8 disposed inside it and the possibly built-in circuit; When the transmitting coil housing 2 is moved to the receiving coil housing 5, and the transmitting coil housing 2 and the receiving coil housing 5 are aligned to a preset position through the connecting member, the transmitting coil 8 and the receiving coil 10 are facing each other and in a matching state, and the gap and offset between the transmitting coil 8 and the receiving coil 10 are less than or equal to a set threshold. The threshold can be set according to actual needs. In a specific implementation process, the offset can be + / −5 mm, the gap can be 2 - 4 mm, etc., and specific settings need to be determined according to actual situations.

[0041] In an embodiment of the present invention, when the transmitting coil housing 2 and the receiving coil housing 5 are aligned to a preset position through the connecting member, there is only a very small gap (such as less than 2 mm) between the transmitting coil housing 2 and the receiving end housing 5, preventing foreign objects from falling into the gap between the transmitting housing and the receiving housing during charging. Therefore, during the specific use process, it is only necessary to detect foreign objects before charging, and there is no need to detect foreign objects during charging, greatly reducing the difficulty of foreign object detection. Since the relative positions of the transmitting coil 8 and the receiving coil 10 are relatively fixed, many electrical parameters for detecting metal foreign objects are also relatively fixed and consistent, which makes it easier to determine the threshold value of the change in the electrical parameters caused by the metal foreign object, reducing the difficulty of metal foreign object detection. Even if a metal foreign object is brought in during use, only very small metal foreign objects can be accommodated, such as staples. Even if the small metal foreign object is missed during detection, due to the small area and volume of the metal foreign object, and because there is a strong coupling between the transmitting coil 8 and the receiving coil 10 in the present invention, only a small magnetic field intensity is required to transmit sufficient power to the output. Therefore, the small metal foreign object generates a very small eddy current in a magnetic field with a small intensity, and thus will not cause a high temperature rise, so it will not become a dangerous hidden danger. In addition, when the transmitting coil housing 2 is not attached to the receiving end housing 5, if a foreign object falls onto the transmitting mating surface 9 or the receiving mating surface 11, the installation angle of the transmitting coil housing 2 or the receiving coil housing 5 (the angle between the transmitting coil housing 2 or the receiving coil housing 5 and the horizontal plane is an acute angle or a right angle, preferably a right angle) can also cause the foreign object to slide off the surface of the housing.

[0042] In the specific implementation process, both the transmitting coil 8 and the receiving coil 10 can be selected as coils with a planar structure, which are wound by one or more planar coils. Each planar coil is wound by a high-frequency wire, and the high-frequency wire can be selected as, for example, Litz wire made of multiple insulated fine wires or other high-frequency wires suitable for high-frequency current. When performing wireless power transmission, one plane of the transmitting coil 8 faces the one plane of the receiving coil 10, and there is a certain gap between the two facing planes. At this time, the two coils have a certain coupling coefficient. The two facing planes of the transmitting coil 8 and the receiving coil 10 are respectively called the front surface 3 of the transmitting coil and the front surface 6 of the receiving coil. The other side of the coil opposite to the front surface 3 of the transmitting coil is the back surface 6 of the transmitting coil; the other side of the coil opposite to the front surface 6 of the receiving coil is the back surface 7 of the receiving coil. For details, see Figure 7 . The back surface 6 of the transmitting coil and the back surface 7 of the receiving coil can also contain magnetic materials, such as ferrite or other materials with a relatively high magnetic permeability, to enhance the coupling coefficient when the two coils face each other and to shield the magnetic field within the two coils. For the convenience of description, the transmitting coil 8 or the receiving coil 10 in the description of the present invention may or may not contain magnetic materials located on the back surface of the coil.

[0043] The transmitting coil housing 2 has a transmitting mating surface 9 that covers the front surface 3 of the transmitting coil. The transmitting mating surface 9 covers the front surface 3 of the transmitting coil, is parallel to the front surface 3 of the transmitting coil, and has a very small spacing from the front surface 3 of the transmitting coil, that is, the gap between the two is less than a set second threshold value, and the value range of the second threshold value is 2 to 4 mm.

[0044] The receiving coil housing 5 has a receiving mating surface 11 that covers the front surface 6 of the receiving coil. The receiving mating surface 11 covers the front surface 6 of the receiving coil, is parallel to the front surface 6 of the receiving coil, and has a very small spacing from the front surface 6 of the receiving coil, that is, the gap between the two is less than a set third threshold value, and the value range of the third threshold value is, for example, 2 to 4 mm. Through the alignment design of the connecting member, the transmitting coil 8 and the receiving coil 10 can be made to face each other and have a very small offset, for example, less than 5 mm. At the same time, there is a very small gap between the transmitting mating surface 9 of the transmitting coil 8 and the receiving mating surface 11 of the receiving coil 10, for example, less than 2 mm. For details, see Figure 7 .

[0045] When the transmitting coil housing 2 and the receiving coil housing 5 are aligned to the preset position through the connecting member, for example, when the transmitting coil housing 2 is moved to the receiving coil housing 5, the transmitting mating surface 9 of the transmitting coil housing 2 and the receiving mating surface 11 of the receiving coil 10 can be well attached and well aligned to the preset position. The front surface 3 of the transmitting coil and the front surface 6 of the receiving coil are facing each other and in a matching state, and the gap and offset between the two are less than or equal to the set threshold values. In a specific implementation process, the matching state may mean that the front surface 3 of the transmitting coil and the front surface 6 of the receiving coil are in a facing state, the coupling coefficient between the transmitting coil 8 and the receiving coil 10 can be greater than 0.25, and the change rate of the coupling coefficient caused by the gap and offset between the coils can be less than ±25%; the gap between the transmitting coil 8 and the receiving coil 10 can be set to <5 mm, having a strong coupling, so that a very small area of the coil can provide and receive the designed power. With a strong coupling, a relatively small electromagnetic field can cause the transmitting coil 8 to couple to sufficient energy and reach the designed output power. A relatively small electromagnetic field and a relatively small coil area mean that the transmitting coil 8 only needs a relatively small current, thereby generating a relatively small electromagnetic radiation intensity and radiation range.

[0046] In a specific implementation manner of the embodiment of the present invention, as Figure 3 shown, the connecting member includes a first frame 80 and a first support plate 81; both the first frame 80 and the first support plate 81 are provided on the side of the receiving coil housing 5 for aligning with the transmitting coil housing 2, and the first support plate 81 is located below the first frame 80; the top and bottom of the first frame 80 are both open structures; After the lower end of the transmitting coil housing 2 is engaged with the upper end of the first frame 80, under the action of gravity, the transmitting coil housing 2 slides along the first frame 80 until it contacts the first support plate 81, then the transmitting coil housing 2 and the receiving coil housing 5 are aligned to the preset position. The connecting member in the embodiment of the present invention has a simple structure and is convenient to realize the alignment of the transmitting coil housing 2 and the receiving coil housing 5. The connecting member in the embodiment of the present invention has a simple structure and is convenient to realize the alignment of the transmitting coil housing 2 and the receiving coil housing 5. In the specific implementation process, the first support plate 81 can be set as an open or hollow structure. If rainwater or other foreign objects fall into the groove, they can slide off from the opening or hollow of the first support plate 81. As Figure 3 shown, the first frame 80 includes two L-shaped plates arranged oppositely. In a specific implementation manner of the embodiment of the present invention, electromagnetic shielding materials or metal materials can be added to some or all of the side walls of the receiving coil housing 5 and the transmitting coil housing 2 to shield electromagnetic radiation, which can not only reduce the electromagnetic radiation to the human body and living things around the housing, and the electromagnetic interference to other electronic devices around the receiving coil housing 5 and the transmitting coil housing 2, but also shield the electromagnetic interference from the environment and surrounding electronic devices to the circuits in the receiving coil housing 5 and the transmitting coil housing 2, and increase the reliability of the circuits in the housing. The electromagnetic shielding material can be a ferrite soft magnetic material with high magnetic permeability, an amorphous nanocrystalline material, and an alloy soft magnetic material composed of iron, cobalt, nickel, manganese, etc. The metal material can be materials such as copper, aluminum, and stainless steel.

[0047] In a specific embodiment of the present invention, as Figure 2 shown, the wireless charging device further includes a wireless charging transmitting module 20 and a wireless charging receiving module 40; the wireless charging transmitting module 20 is connected to the transmitting coil 8 through a cable 12. During charging, the alternating current generated by the wireless charging transmitting module 20 is transmitted to the transmitting coil 8 through the cable 12. The wireless charging receiving module 40 is connected to the receiving coil 10. The electric energy induced by the receiving coil 10 is transmitted to the wireless charging receiving module 40. The wireless charging transmitting module 20 includes a position detection circuit 47. When the position detection circuit 47 detects that the transmitting coil housing 2 and the receiving coil housing 5 are aligned to the preset position, the position detection circuit 47 generates a charging trigger signal to make the wireless charging transmitting module 20 supply power to the transmitting coil 8, further making the transmitting coil 8 and the receiving coil 10 generate electromagnetic coupling, and supplying power to the wireless charging receiving module 40 connected to the receiving coil 10.

[0048] In a specific embodiment of the present invention, when the position detection circuit 47 detects that the transmitting coil housing 2 and the receiving coil housing 5 are not aligned to the preset position, the position detection circuit 47 generates a power-off trigger signal to stop the wireless charging transmitting module 20 from supplying power to the transmitting coil 8, and further causes the transmitting coil 8 and the receiving coil 10 not to generate electromagnetic coupling.

[0049] In a specific embodiment of the present invention, the wireless charging device further includes a transmitting coil placement member 13 for placing the transmitting coil housing 2. In the specific implementation process, the transmitting coil placement member 13 is arranged on the charging rack and placed beside the wireless charging transmitting module 20. The transmitting coil housing 2 is connected to the wireless charging transmitting module 20 through a cable 12. The cable 12 has a certain length and flexibility to provide sufficient backward movement space for the transmitting coil housing 2. Users can conveniently separate the transmitting coil housing 2 from the receiving coil housing 5 and put it back on the charging rack, and at the same time can also conveniently remove it for alignment with the receiving coil housing 5.

[0050] In a specific embodiment of the present invention, the wireless charging transmitting module 20 includes a position detection circuit 47, a transmitting end control circuit 22, a transmitting end communication circuit 23, and a transmitting end charging circuit 21; the transmitting end control circuit 22 is respectively connected to the position detection circuit 47, the transmitting end communication circuit 23, and the transmitting end charging circuit 21, and the transmitting end charging circuit 21 is connected to the transmitting coil 8; the wireless charging receiving module 40 includes a receiving end control circuit 42, a receiving end communication circuit 43, and a receiving end charging circuit 41; the receiving end control circuit 42 is respectively connected to the receiving end communication circuit 43 and the receiving end charging circuit 41, and the receiving end charging circuit 41 is connected to the receiving coil 10; wherein, the transmitting end control circuit 22, the transmitting end communication circuit 23, the position detection circuit 47, and the transmitting end charging circuit 21 are placed outside the housing; in the specific implementation process, the wireless charging transmitting module 20 is integrated on the charging rack; part or all of the wireless charging receiving module 40 is placed inside or outside the housing; when the user needs to charge charging devices such as an electric vehicle, only need to remove the transmitting coil housing 2 from the transmitting coil placement member 13 of the charging rack and insert it into the connecting member (i.e., the first frame 80), when the position detection circuit 47 detects that the transmitting coil housing 2 is aligned with the receiving coil housing 5 to the preset position, the position detection circuit 47 generates a charging trigger signal, the charging trigger signal is transmitted to the transmitting end control circuit 22, and the transmitting end control circuit 22 controls the transmitting end charging circuit 21 to provide electrical energy for the transmitting coil 8, so that the transmitting coil 8 and the receiving coil 10 generate electromagnetic coupling, and provide electrical energy for the receiving end charging circuit 41 connected to the receiving coil 10. When the position detection circuit 47 detects that the transmitting coil housing 2 slightly leaves the preset position, the position detection circuit 47 generates a power-off trigger signal and transmits it to the transmitting end control circuit 22, and the transmitting end control circuit 22 controls the transmitting end charging circuit 21 to stop providing electrical energy for the transmitting coil 8, so that the transmitting coil 8 and the receiving coil 10 do not generate electromagnetic coupling, stop charging the battery 50, and at the same time ensure the safety of user use.

[0051] In a specific embodiment of the present invention, the transmitting end charging circuit 21 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 8 through a cable 12. The cable 12 has a certain length and flexibility so that the transmitting coil housing 2 can be taken or placed back on the charging rack, and has a certain activity space; in the actual use process, the charging interface is connected to the power supply 1; the inverter circuit converts the DC electrical energy input at the charging interface into high-frequency alternating current and transmits it to the first resonant circuit, so that the high-frequency alternating current is transmitted to the transmitting coil 8 to generate an electromagnetic field.

[0052] In a specific embodiment of the present invention, the wireless charging transmitting module 20 further includes a transmitting end measuring circuit 24 and a transmitting end protection circuit 25 connected to the transmitting end control circuit 22; both the transmitting end measuring circuit 24 and the transmitting end protection circuit 25 are connected to the transmitting end charging circuit 21; the transmitting end measuring circuit 24 is used to detect the charging parameters of the transmitting end charging circuit 21 and send them to the transmitting end control circuit 22. When the transmitting end control circuit 22 determines that the transmitting end charging circuit 21 is abnormal (such as overvoltage, overcurrent or overheating), a control signal is sent to the transmitting end protection circuit 25, and the transmitting end protection circuit 25 cuts off the direct current of 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 the vehicle, avoiding potential safety hazards caused by battery 50 damage, power supply 1 or damage to the transmitting end circuit due to overvoltage, overcurrent or overheating during charging.

[0053] In a specific embodiment of the present invention, the receiving end charging circuit 41 includes a second resonant circuit and a rectifying and filtering circuit connected in sequence. The second resonant circuit is connected to the receiving coil 10; the rectifying and filtering circuit is used to be connected to the battery 50.

[0054] In a specific embodiment of the present invention, the wireless charging receiving module 40 further includes a receiving end measuring circuit 44 and a receiving end protection circuit 45 connected to the receiving end control circuit 42; the receiving end measuring circuit 44 and / or the receiving end protection circuit 45 is / are arranged inside or outside the receiving coil housing; both the receiving end measuring circuit 44 and the receiving end protection circuit 45 are connected to the receiving end charging circuit 41; The receiving - end measurement circuit 44 is used to detect the charging parameters of the receiving - end charging circuit 41 and send them to the receiving - end control circuit 42. When the receiving - end control circuit 42 determines that the receiving - end charging circuit 41 or the battery 50 is abnormal (such as over - voltage, over - current, or over - temperature), it sends a control signal to the receiving - end protection circuit 45, and the receiving - end protection circuit 45 stops the output of the rectifying and filtering circuit. In a specific implementation process, if the battery 50 has a battery 50 management system (BMS) interface, the receiving - end control circuit 42 can obtain the charging parameters of the battery 50, the ID of the battery 50, the safe charging voltage and current of the battery 50, and the real - time temperature of the battery 50 through the connection with the battery 50 BMS interface. During charging, the receiving - end control circuit 42 communicates with the BMS and sends the data obtained from the BMS to the transmitting - end control circuit 22. According to the requirements of the BMS, the transmitting - end control circuit 22 controls the safe charging voltage and current. When the temperature of the battery 50 exceeds the safe temperature, the receiving - end protection circuit 45 stops the output of the rectifying and filtering circuit. The ID of the battery 50 and other battery 50 parameters are also sent to the transmitting - end control circuit 22 through the communication module to authenticate the battery 50 parameters and prevent charging of non - formal, expired, mismatched, or non - compliant - with - design - specifications batteries 50.

[0055] In a specific embodiment of the present invention, when the receiving - end control circuit 42 determines that the receiving - end charging circuit 41 is abnormal based on the charging parameters, it also sends a control signal to the receiving - end communication circuit 43. The control signal passes through the transmitting - end communication circuit 23 and the transmitting - end control circuit 22 in sequence, and the transmitting - end control circuit 22 controls the transmitting - end charging circuit 21 to stop providing electrical energy to the transmitting coil 8. This not only ensures the convenience of charging but also guarantees the charging safety of users and vehicles, avoiding potential safety hazards caused by battery 50 damage or receiving - end circuit damage due to over - voltage, over - current, or over - temperature during charging.

[0056] In a specific embodiment of the present invention, the wireless charging receiving module 40 further includes a receiving - end switch circuit 46. The receiving - end switch circuit 46 is connected to the output end of the receiving - end protection circuit 45 and is disposed between the rectifying and filtering circuit and the battery 50. When the receiving - end protection circuit 45 triggers protection, the receiving - end protection circuit 45 controls the receiving - end switch circuit 46 to act, so that the physical connection between the rectifying and filtering circuit and the battery 50 is disconnected, thereby improving the safety performance of the wireless charging device.

[0057] In a specific embodiment of the present invention, the wireless charging transmitting module 20 further includes a transmitting - end charging status display module, and the wireless charging receiving module 40 further includes a receiving - end charging status display module; the receiving - end measurement circuit 44 is used to detect the charging parameters of the receiving - end charging circuit 41 and send them to the receiving - end control circuit 42. When the receiving - end control circuit 42 determines that the receiving - end charging circuit 41 is abnormal based on the charging parameters, it sends a status display signal to the receiving - end charging status display module, and at the same time, it also sends a status display signal to the receiving - end communication circuit 43. The status display signal is sent to the transmitting - end charging status display module after passing through the transmitting - end communication circuit 23 and the transmitting - end control circuit 22 in sequence. Different charging, standby, and abnormal states can be displayed using LEDs of different colors or LEDs with different blinking frequencies, etc.

[0058] In a specific embodiment of the present invention, the wireless charging device further includes a position sensing circuit 26, which is used to help the position detection circuit 47 quickly and accurately detect whether the alignment of the transmitting coil housing 2 and the receiving coil housing 5 reaches the preset position. The position detection circuit 47 is placed outside the transmitting coil housing 2, and the position sensing circuit 26 is placed inside the transmitting coil housing 2 and is connected to the position detection circuit 47 placed in the wireless charging transmitting module 20. The position sensing circuit 26 can be a proximity - type position sensing circuit, such as electromagnetic, photoelectric, capacitive, and Hall - type, etc.; the position sensing circuit can also be a contact - type position sensing circuit, such as a mechanical switch, etc.

[0059] In a specific implementation manner of the embodiment of the present invention, the wireless charging device further includes a human body sensing circuit 27. The human body sensing circuit 27 is placed inside the transmitting coil housing 2 and is connected to the wireless charging transmitting module 20; when a certain part of the human body (such as a person's finger) touches the transmitting coil housing 2, the human body sensing circuit 27 generates a trigger signal and transmits it to the wireless charging transmitting module 20, so that the wireless charging transmitting module 20 stops supplying power to the transmitting coil 8, ensuring the use safety. This can also make the transmitting module immediately stop supplying power to the transmitting coil 8 when a finger touches the transmitting coil housing 2 before the user unpluggs the transmitting coil 8, further enhancing the safety of use. Embodiment 2

[0060] The difference between the embodiment of the present invention and Embodiment 1 is that: the connecting member includes a matching first connecting portion and a second connecting portion, and the first connecting portion and the second connecting portion are respectively arranged on the transmitting coil housing 2 and the receiving coil housing 5. In a specific implementation manner of the embodiment of the present invention, as Figure 4As shown, the first connecting part and the second connecting part are respectively the transmitting end magnet module 60 and the receiving end magnet module 61, and the two attract each other. In the specific implementation process, both the first connecting part and the second connecting part are arranged inside the transmitting coil housing 2 and the receiving coil housing 5.

[0061] In a specific implementation manner of the embodiment of the present invention, as Figure 5 shown, the first connecting part is a sliding groove 90; the second connecting part includes a second frame 91 and a second supporting plate 92; the sliding groove 90 is arranged on the outer wall of the transmitting coil housing 2; the second frame 91 and the second supporting plate 92 are both arranged on the side of the receiving coil housing 5 for aligning with the transmitting coil housing 2, and the second supporting plate 92 is located below the second frame 91; the top and bottom of the second frame 91 are both open structures; when the lower end of the sliding groove 90 is engaged with the upper end of the second frame 91, under the action of gravity, the transmitting coil housing 2 slides along the second frame 91 until it contacts the second supporting plate 92, then the transmitting coil housing 2 and the receiving coil housing 5 are aligned to the preset position. In the specific implementation process, the second supporting plate 92 can be set as an open or hollow structure. If rainwater or other foreign objects fall into the groove, they can slide down from the opening or hollow of the second supporting plate 92. As Figure 5 shown, the second frame 92 includes two L-shaped plates arranged oppositely. The thickness of the second frame 92 is about 2-3 mm less than the width of the sliding groove 90, so as to facilitate the user to engage the sliding groove 90 arranged on the transmitting coil housing 2 with the second frame 91 arranged on the receiving coil housing 5.

[0062] In a specific implementation manner of this embodiment, as Figure 6 shown, the first connecting part is a buckle 70 arranged on the top of the transmitting coil housing 2; the second connecting part is a clamping groove 71 arranged on the top of the receiving coil housing 5; when the buckle 70 on the transmitting coil housing 2 is snapped into the clamping groove 71 on the receiving coil housing 5, then the transmitting coil housing 2 and the receiving coil housing 5 are aligned to the preset position.

[0063] In a specific implementation manner of this embodiment, the wireless charging receiving module 40 can be wholly or partly placed inside the receiving coil housing 8.

[0064] In a specific implementation manner of this embodiment, the receiving coil housing 8 is placed inside the vehicle body shell, the receiving fitting surface 11 is attached to the inner side of the vehicle body shell, and a connecting piece is installed on the outer side of the vehicle body shell. When the transmitting coil housing 2 is moved to the vehicle body, through the installed connecting piece, the transmitting fitting surface 9 of the transmitting coil housing 2 and the receiving fitting surface 11 of the receiving coil 10 can be well attached and can be well aligned to the preset position. The front surface 3 of the transmitting coil is directly opposite to the front surface 6 of the receiving coil and is in a matching state. Moreover, there is a layer of the vehicle body shell between the transmitting fitting surface 9 and the receiving fitting surface 11 of the receiving coil 10, and the vehicle body shell between the transmitting fitting surface 9 and the receiving fitting surface 11 of the receiving coil 10 is made of a non-metallic material.

[0065] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the protected content of the present invention.

[0066] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A wireless charging device, characterized in that: It includes a receiving coil, a receiving coil housing, a transmitting coil, a transmitting coil housing and a connecting piece; The receiving coil is arranged inside the receiving coil housing; The transmitting coil is arranged inside the transmitting coil housing; When the transmitting coil housing is moved to the receiving coil housing, and the transmitting coil housing and the receiving coil housing are aligned to a preset position through the connecting piece, the transmitting coil and the receiving coil are directly opposite and in a matching state, and the gap and offset between the transmitting coil and the receiving coil are less than or equal to a set threshold.

2. A wireless charging device according to claim 1, characterized in that: The connecting piece is arranged on the receiving coil housing.

3. A wireless charging device according to claim 2, characterized in that: The connecting member includes a first frame and a first support plate which are independently arranged, both of which are arranged on the side of the receiving coil housing for alignment with the transmitting coil housing, and the first support plate is located below the first frame; The top and bottom of the first frame are both open structures; When the transmitting coil housing is inserted from the top opening of the first frame, under the action of gravity, the transmitting coil housing slides along the first frame until it contacts the first supporting plate, and the transmitting coil housing and the receiving coil housing are aligned to a preset position.

4. A wireless charging device according to claim 2, characterized in that: The first support plate is configured as an open or hollow structure.

5. The wireless charging device according to claim 1, characterized in that: The connecting member comprises a first connecting portion and a second connecting portion that match each other, and the first connecting portion and the second connecting portion are respectively arranged on the transmitting coil housing and the receiving coil housing.

6. A wireless charging device according to claim 5, characterized in that: The first connection part and the second connection part are respectively a transmitting end magnet module and a receiving end magnet module, and the two attract each other.

7. A wireless charging device according to claim 6, characterized in that: The first connecting portion and the second connecting portion are both arranged inside the transmitting coil housing and the receiving coil housing.

8. The wireless charging device according to claim 5, characterized in that: The first connection part is a slide groove; the second connection part includes a second frame and a second support plate; The slide groove is arranged on the outer wall of the transmitting coil housing; The second frame and the second support plate are both arranged on the side of the receiving coil housing for alignment with the transmitting coil housing, and the second support plate is located below the second frame; The top and bottom of the second frame are both open structures; When the lower end of the slide groove is engaged with the upper end of the second frame, the transmitting coil housing slides along the second frame under the action of gravity until it contacts the second support plate, and the transmitting coil housing and the receiving coil housing are aligned to a preset position.

9. A wireless charging device according to claim 8, characterized in that: The second support plate is configured as an open or hollow structure.

10. The wireless charging device according to claim 5, characterized in that: The first connection part is a buckle, which is arranged on the top of the transmitting coil housing; the second connection part is a slot, which is arranged on the top of the receiving coil housing; When the buckle on the transmitting coil housing is inserted into the slot on the receiving coil housing, the transmitting coil housing and the receiving coil housing are aligned to a preset position.

11. The wireless charging device according to claim 1, characterized in that: The wireless charging device further includes a wireless charging transmitting module and a wireless charging receiving module; the wireless charging transmitting module includes a position detection circuit; When the position detection circuit detects that the transmitting coil housing and the receiving coil housing are aligned to a preset position, the position detection circuit generates a charging trigger signal so that the wireless charging transmitting module provides power to the transmitting coil, 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 housing and the receiving coil housing are not aligned to the preset position, 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 further preventing the transmitting coil and the receiving coil from generating electromagnetic coupling.

13. A wireless charging device according to claim 12, characterized in that: The wireless charging device also includes a position sensing circuit, which is placed in the transmitting coil housing and connected to the position detection circuit, and is used to detect whether the positions of the transmitting coil and the receiving coil are matched and send a signal position detection circuit, which is used to help the position detection circuit detect whether the transmitting coil housing and the receiving coil housing are aligned to a preset position.

14. The wireless charging device according to claim 11, characterized in that: The wireless charging device also includes a human body sensing circuit, which is placed in the transmitting coil housing and connected to the wireless charging transmitting module; when a part of the human body touches the transmitting coil housing, the human body sensing circuit generates a trigger signal, which is transmitted to the wireless charging transmitting module, so that the wireless charging transmitting module stops providing power to the transmitting coil.

15. The wireless charging device according to claim 1, characterized in that: The transmitting coil housing has a transmitting fitting surface; the receiving coil housing has a receiving fitting surface; the transmitting coil comprises a transmitting coil front surface and a transmitting coil back surface which are arranged opposite to each other; the receiving coil comprises a receiving coil front surface and a receiving coil back surface which are arranged opposite to each other; The front face of the transmitting coil is parallel to the transmitting bonding surface, and the gap between the two is smaller than a set second threshold; The front face of the receiving coil is parallel to the receiving bonding face, and the gap between the two is smaller than a set third threshold; When the transmitting fitting surface and the receiving fitting surface are aligned to a preset position through the connecting member, the front face of the transmitting coil and the front face of the receiving coil face each other and are in a matching state.

16. A wireless charging device according to claim 15, characterized in that: The second threshold and the third threshold both have a value range of 2-4 mm.

17. The wireless charging device of claim 15, characterized in that: The receiving coil shell is placed on the inner side of the shell of the device to be charged, the receiving fitting surface is in contact with the inner side of the shell of the device to be charged, and the connecting piece is installed on the outer side of the shell of the device to be charged; when the transmitting coil shell is moved to the device to be charged, by installing the connecting piece, the transmitting fitting surface of the transmitting coil shell and the receiving fitting surface of the receiving coil can be well fitted and well aligned to the preset position, the front face of the transmitting coil faces the front face of the receiving coil and is in a matching state, and there is a layer of the shell of the device to be charged between the transmitting fitting surface and the receiving fitting surface of the receiving coil, and the shell of the device to be charged between the transmitting fitting surface and the receiving fitting surface of the receiving coil is a non-metallic material.

18. The wireless charging device according to claim 1, characterized in that: Electromagnetic shielding material or metal material is added to part or all of the side walls of the receiving coil housing and the transmitting coil housing.

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