Wireless charging device

Abstract

The utility model 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 utility model, the coil dislocation during charging can be reduced, the coil area can be reduced, the requirement for foreign matter detection can be reduced, and electromagnetic radiation can be reduced, so that the charging safety is ensured while the charging efficiency is ensured, and the manufacturing cost of the charging device is reduced.

Description

Technical Field

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

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

[0003] Existing wireless charging methods for electric bicycles typically involve installing a receiving coil 10 at a specific location on the bicycle. When the bicycle is parked, the transmitting coil 8 and the receiving coil 10 align within a certain range. This allows the receiving coil 10 to draw electrical energy and charge the bicycle without physical contact, through an electromagnetic field generated by the transmitting coil 8 and electromagnetic induction between the transmitting coil 8 and the receiving coil 10, which in turn charges the bicycle via a connected circuit. When the bicycle is parked within the designated wireless charging area, the charging system automatically detects and begins operation, eliminating the need for manual cable plugging or unplugging. While this charging method offers many conveniences, it also has some drawbacks, primarily including:

[0004] 1. Misalignment between transmitting coil 8 and receiving coil: The wireless charging system relies on the alignment of the receiving coil 10 of the electric vehicle with the corresponding transmitting coil 8. If the vehicle is parked at an angle or with misalignment, the alignment deviation or spacing between the coils will increase, which will lead to reduced charging efficiency, resulting in increased energy loss and heat generation.

[0005] 2. Heating caused by foreign metal objects: During the charging process, since there may be a large gap between the transmitting coil 8 and the receiving coil 10, when foreign metal objects are present between the two coils, these foreign metal objects will generate eddy currents from the magnetic field, thereby generating heat.

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

[0007] 3. To ensure a certain degree of freedom in vehicle parking, including a certain range of lateral offset and longitudinal gap, the vertical gap between the coils is relatively large. Combined with the offset of the center points of the two coils, the coupling coefficient of the coils becomes smaller. This necessitates increasing the current and area of ​​the transmitting coil 8, thereby increasing the intensity and range of electromagnetic radiation. Electromagnetic radiation includes radiation to people or living objects around the coils, as well as electromagnetic interference to surrounding electronic equipment. Due to the freedom of vehicle parking, it is also difficult to install structural components with electromagnetic shielding materials around the coils.

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

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

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

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

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

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

[0014] The receiving coil is disposed inside the receiving coil housing;

[0015] The transmitting coil is located inside the transmitting coil housing;

[0016] 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 via the connector, the transmitting coil and the receiving coil are facing each other and in a matched state, and the gap and offset between the transmitting coil and the receiving coil are less than or equal to a set threshold.

[0017] Optionally, the connector is disposed on the housing of the receiving coil.

[0018] Optionally, the connector includes a first frame and a first support plate that are independently disposed 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.

[0019] 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 support plate, and then the transmitting coil housing and the receiving coil housing are aligned to the preset position.

[0020] Optionally, the first tray is configured as an open or hollow structure.

[0021] Optionally, the connector includes a first connecting portion and a second connecting portion that cooperate with each other, the first connecting portion and the second connecting portion being respectively disposed on the transmitting coil housing and the receiving coil housing.

[0022] Optionally, the first connecting part and the second connecting part are respectively a transmitter magnet module and a receiver magnet module, which attract each other.

[0023] Optionally, both the first connecting part and the second connecting part are disposed inside the transmitting coil housing and the receiving coil housing.

[0024] Optionally, the first connecting part is a slide groove; the second connecting part includes a second frame and a second support plate;

[0025] The groove is provided on the outer wall of the transmitting coil housing;

[0026] The second frame and the second tray are both provided on the side of the receiving coil housing for alignment with the transmitting coil housing, and the second tray is located below the second frame; the top and bottom of the second frame are both open structures.

[0027] When the lower end of the slide 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 then the transmitting coil housing and the receiving coil housing are aligned to the preset position.

[0028] Optionally, the second tray is configured as an open or hollow structure.

[0029] Optionally, the first connecting part is a snap fastener, located on the top of the transmitting coil housing; the second connecting part is a slot, located on the top of the receiving coil housing.

[0030] When the clip on the transmitting coil housing engages with the slot on the receiving coil housing, the transmitting coil housing and the receiving coil housing are aligned to the preset position.

[0031] Optionally, the wireless charging device further includes a wireless charging transmitter module and a wireless charging receiver module; the wireless charging transmitter module includes a position detection circuit.

[0032] 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, causing the wireless charging transmitting module to provide power to the transmitting coil, further causing the transmitting coil and the receiving coil to generate electromagnetic coupling, and providing power to the wireless charging receiving module connected to the receiving coil.

[0033] 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 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.

[0034] 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. The position sensing circuit is used to detect whether the positions of the transmitting coil and the receiving coil are matched and to send a signal. The position detection circuit 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.

[0035] 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 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, causing the wireless charging transmitting module to stop providing power to the transmitting coil.

[0036] Optionally, the transmitting coil housing has a transmitting contact surface; the receiving coil housing has a receiving contact surface; the transmitting coil includes a transmitting coil front side and a transmitting coil back side disposed opposite to each other; the receiving coil includes a receiving coil front side and a receiving coil back side disposed opposite to each other.

[0037] The front of the transmitting coil is parallel to the transmitting contact surface, and the gap between them is less than a set second threshold.

[0038] The front of the receiving coil is parallel to the receiving contact surface, and the gap between them is less than a set third threshold.

[0039] When the transmitting and receiving surfaces are aligned to the preset position via the connector, the front of the transmitting coil and the front of the receiving coil are directly opposite each other and in a matching state.

[0040] Optionally, the values ​​of the second threshold and the third threshold are both in the range of 2~4mm.

[0041] Optionally, the receiving coil housing is placed inside the outer shell of the device to be charged, with the receiving contact surface touching the inner side of the outer shell of the device to be charged, and the connector is installed on the outer side of the outer shell of the device to be charged. When the transmitting coil housing is moved to the device to be charged, by installing the connector, the transmitting contact surface of the transmitting coil housing and the receiving contact surface of the receiving coil can fit well together and be well aligned to the preset position. The front of the transmitting coil and the front of the receiving coil face each other and are in a matching state. There is a layer of the outer shell of the device to be charged between the transmitting contact surface and the receiving contact surface of the receiving coil, and the outer shell of the device to be charged between the transmitting contact surface and the receiving contact surface of the receiving coil is made of non-metallic material.

[0042] Optionally, electromagnetic shielding material or metal material may be installed on some or all of the side walls of the receiving coil housing and the transmitting coil housing.

[0043] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0044] This invention proposes a wireless charging device that can not only reduce coil misalignment during charging, but also reduce the need for foreign object detection and significantly reduce electromagnetic radiation, thereby ensuring charging efficiency, charging safety, and reducing the manufacturing cost of the charging system.

[0045] In this invention, the gap between the transmitting coil and the receiving coil can be very close (e.g., <5mm), resulting in strong coupling. Thus, a very small coil area can be used to provide and receive the designed power.

[0046] This invention aligns a transmitting coil housing containing a transmitting coil and a receiving coil housing containing a receiving coil using a connector to a preset position. This ensures that the transmitting and receiving coils are directly opposite each other and in a matched state, with the gap and offset between them less than or equal to a set threshold. Misalignment is essentially eliminated, resulting in a strong coupling coefficient. This eliminates the need to increase the transmitting coil area, and the smaller transmitting coil results in a smaller volume and weight, ensuring ease of insertion and repositioning. Simultaneously, the strong coupling coefficient and small coil area reduce the intensity and range of electromagnetic radiation.

[0047] This utility model provides various specific structures for connecting parts, making it easier for users to take out the transmitting coil 8 and insert it into the housing to charge electric vehicles, etc.

[0048] When the position detection circuit in this invention detects that the transmitting coil housing and the receiving coil housing are aligned to a preset position via the connector, it sends a trigger signal to the wireless charging transmitting module, causing the wireless charging transmitting module to provide power to the transmitting coil 8. When the transmitting coil housing is slightly pulled out by external force, the position detection circuit will send a trigger signal to the wireless charging transmitting module, causing the wireless charging transmitting module to stop providing power to the transmitting coil, ensuring safety during use. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0050] Figure 1 This is a schematic diagram of the overall structure of a wireless charging device according to an embodiment of the present invention;

[0051] Figure 2 This is a schematic diagram of the principle of a wireless charging device according to an embodiment of the present invention;

[0052] Figure 3 This is one of the structural schematic diagrams of a connector according to an embodiment of the present utility model;

[0053] Figure 4 This is a second schematic diagram of the structure of the connector according to one embodiment of the present utility model;

[0054] Figure 5 This is the third schematic diagram of the structure of the connector according to one embodiment of the present utility model;

[0055] Figure 6This is the fourth schematic diagram of the structure of the connector according to one embodiment of the present utility model;

[0056] Figure 7 This is a schematic diagram of the front and back of the coil and the mating surface of the housing according to an embodiment of the present invention;

[0057] in:

[0058] 1-Power supply, 2-Transmitting coil housing, 3-Transmitting coil front, 4-Transmitting coil back, 5-Receiver coil housing, 6-Receiver coil front, 7-Receiver coil back, 8-Transmitting coil, 9-Transmitting mating surface, 10-Receiver coil, 11-Receiver mating surface, 12-Cable, 13-Transmitting coil placement piece, 20-Wireless charging transmitter module, 21-Transmitter charging circuit, 22-Transmitter control circuit, 23-Transmitter communication circuit, 24-Transmitter measurement circuit, 25-Transmitter 26-End protection circuit, 27-Position sensor circuit, 40-Human body sensing circuit, 41-Wireless charging receiver module, 42-Receiver charging circuit, 43-Receiver control circuit, 44-Receiver communication circuit, 45-Receiver measurement circuit, 46-Receiver protection circuit, 47-Receiver switch circuit, 50-Position detection circuit, 60-Transmitter magnet module, 61-Receiver magnet module, 70-Snap-on, 71-Slot, 80-First frame, 81-First tray, 90-Slide groove, 91-Second frame, second tray. Detailed Implementation

[0059] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0060] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may include different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0061] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0062] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] The application principle of this utility model will be described in detail below with reference to the accompanying drawings. Example 1

[0064] This utility model provides a wireless charging device, such as... Figure 1 As shown, it includes a receiving coil 10, a receiving coil housing 5, a transmitting coil 8, a transmitting coil housing 2, and a connector;

[0065] Both the transmitting coil housing 2 and the receiving coil housing 5 are fully enclosed designs.

[0066] The receiving coil 10 is disposed inside the receiving coil housing 5; in specific implementation, the receiving coil housing 5 can be configured to have good electrical insulation characteristics and a certain mechanical strength to protect the receiving coil 10 disposed inside it and the circuit that may be built in it.

[0067] The transmitting coil 8 is located inside the transmitting coil housing 2. In specific implementation, the transmitting coil housing 2 can be configured to have good electrical insulation properties and a certain mechanical strength to protect the transmitting coil 8 and any circuits that may be built into it.

[0068] 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 via the connector, the transmitting coil 8 and the receiving coil 10 are directly opposite each other and in a matched 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 specific implementations, the offset can be + / - 5mm, the gap 2~4mm, etc., and the specific setting needs to be based on the actual situation.

[0069] In this embodiment of the invention, when the transmitting coil housing 2 and the receiving coil housing 5 are aligned to a preset position via the connector, only a very small gap (e.g., less than 2 mm) remains between the transmitting coil housing 2 and the receiving housing 5. This prevents foreign objects from falling into the gap between the transmitting and receiving housings during charging. Therefore, in practical use, foreign object detection only needs to be performed before charging, eliminating the need for detection during charging and 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 used for detecting metallic foreign objects are also relatively fixed and consistent. This makes it easier to determine the threshold for changes in these electrical parameters caused by metallic foreign objects, further reducing the difficulty of metallic foreign object detection. Even if a metallic foreign object is introduced during use, only very small metallic foreign objects, such as staples, can be accommodated. Even if the small metallic foreign object is missed, because the area and volume of the metallic foreign object are very small, and because there is a strong coupling between the transmitting coil 8 and the receiving coil 10 in this invention, only a small magnetic field strength is needed to transmit sufficient power to the output. Therefore, the small metallic foreign object generates very small eddy currents in a low-intensity magnetic field, thus not causing a high temperature rise, and therefore will not become a dangerous hazard. In addition, when the transmitting coil housing 2 is not attached to the receiving housing 5, if a foreign object falls onto the transmitting contact surface 9 or the receiving contact 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 housing surface.

[0070] In specific implementation, both the transmitting coil 8 and the receiving coil 10 can be selected as coils with a planar structure, wound from one or more planar coils. Each planar coil is wound with high-frequency wire, which can be, for example, Litz wire made of multi-strand insulated fine wire or other high-frequency wire suitable for high-frequency current. During wireless power transmission, one plane of the transmitting coil 8 and one plane of the receiving coil 10 face each other, with 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 side 3 of the transmitting coil and the front side 6 of the receiving coil. The other side of the coil opposite to the front side 3 of the transmitting coil is the back side 6 of the transmitting coil; the other side of the coil opposite to the front side 6 of the receiving coil is the back side 7 of the receiving coil. See details below. Figure 7 The back surfaces 6 of the transmitting coil and 7 of the receiving coil may also contain magnetic materials, such as ferrite or other materials with high permeability, to enhance the coupling coefficient when the two coils are facing each other and to shield the magnetic field within the two coils. For ease of explanation, the transmitting coil 8 or receiving coil 10 described in this invention may or may not contain magnetic materials located on the back surfaces of the coils.

[0071] The transmitting coil housing 2 has a transmitting contact surface 9 that covers the front surface 3 of the transmitting coil. The transmitting contact surface 9 covers the front surface 3 of the transmitting coil and is parallel to the front surface 3 of the transmitting coil, and has a very small gap with the front surface 3 of the transmitting coil, that is, the gap between the two is less than a set second threshold value, which is 2~4mm.

[0072] The receiving coil housing 5 has a receiving contact surface 11 that covers the front surface 6 of the receiving coil. The receiving contact surface 11 covers the front surface 6 of the receiving coil, is parallel to the front surface 6, and has a very small gap between them, i.e., the gap between them is less than a set third threshold, the value of which is, for example, 2~4mm. Through the alignment design of the connector, the transmitting coil 8 and the receiving coil 10 can be aligned directly with a very small offset, for example, less than 5mm. Simultaneously, the transmitting contact surface 9 of the transmitting coil 8 and the receiving contact surface 11 of the receiving coil 10 have a very small gap, for example, less than 2mm. See details. Figure 7 .

[0073] When the transmitting coil housing 2 and the receiving coil housing 5 are aligned to a preset position via the connector, for example, when the transmitting coil housing 2 is moved to the receiving coil housing 5, the transmitting contact surface 9 of the transmitting coil housing 2 and the receiving contact surface 11 of the receiving coil 10 can fit together well and be 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 matched state, and the gap and offset between them are less than or equal to a set threshold. In specific implementation, the matched state can mean that the front surface 3 of the transmitting coil and the front surface 6 of the receiving coil are facing each other, the coupling coefficient between the transmitting coil 8 and the receiving coil 10 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 8 and the receiving coil 10 can be set to <5mm, which has strong coupling, so that the designed power can be provided and received using a very small area of ​​coil. The strong coupling and relatively small electromagnetic field can enable the transmitting coil 8 to couple sufficient energy and achieve the designed output power. A smaller electromagnetic field and a smaller coil area mean that the transmitting coil 8 requires a smaller current, resulting in a smaller electromagnetic radiation intensity and radiation range.

[0074] In one specific embodiment of this utility model, such as Figure 3 As shown, the connector includes a first frame 80 and a first support plate 81; the first frame 80 and the first support plate 81 are both provided on the side of the receiving coil housing 5 for alignment 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.

[0075] When the lower end of the transmitting coil housing 2 engages 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, at which point the transmitting coil housing 2 and the receiving coil housing 5 are aligned to the preset position. The connecting structure in this embodiment is simple and facilitates the alignment of the transmitting coil housing 2 and the receiving coil housing 5. In specific implementation, the first support plate 81 can be configured as an open or hollow structure, so that if rainwater or other foreign objects fall into the groove, they can slide off through the opening or hollow part of the first support plate 81. Figure 3As shown, the first frame 80 includes two L-shaped plates arranged opposite each other. In a specific embodiment of this utility model, some or all sidewalls of the receiving coil housing 5 and the transmitting coil housing 2 can be fitted with electromagnetic shielding material or metal material to shield electromagnetic radiation. This can reduce electromagnetic radiation to the human body and living things around the housing, as well as electromagnetic interference to other electronic devices around the receiving coil housing 5 and the transmitting coil housing 2. It can also shield the electromagnetic interference from the environment and surrounding electronic devices to the circuits inside the receiving coil housing 5 and the transmitting coil housing 2, increasing the reliability of the circuits inside the housing. The electromagnetic shielding material can be a high-permeability ferrite soft magnetic material, an amorphous nanocrystalline material, or an alloy soft magnetic material composed of iron, cobalt, nickel, manganese, etc. The metal material can be copper, aluminum, stainless steel, etc.

[0076] In one specific embodiment of this utility model, such as Figure 2 As shown, the wireless charging device further includes a wireless charging transmitter module 20 and a wireless charging receiver module 40; the wireless charging transmitter module 20 is connected to the transmitting coil 8 via a cable 12. During charging, the AC power generated by the wireless charging transmitter module 20 is transmitted to the transmitting coil 8 via the cable 12. The wireless charging receiver module 40 is connected to the receiving coil 10. The electrical energy sensed by the receiving coil 10 is transmitted to the wireless charging receiver module 40. The wireless charging transmitter 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 a preset position, the position detection circuit 47 generates a charging trigger signal, causing the wireless charging transmitter module 20 to provide power to the transmitting coil 8, further causing the transmitting coil 8 and the receiving coil 10 to generate electromagnetic coupling, and providing power to the wireless charging receiver module 40 connected to the receiving coil 10.

[0077] In a specific embodiment of this utility model, 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 cause the wireless charging transmitting module 20 to stop providing power to the transmitting coil 8, thereby preventing electromagnetic coupling between the transmitting coil 8 and the receiving coil 10.

[0078] In one specific embodiment of this utility model, the wireless charging device further includes a transmitting coil placement component 13 for placing the transmitting coil housing 2. In specific implementation, the transmitting coil placement component 13 is set on the charging rack and placed next to the wireless charging transmitting module 20. The transmitting coil housing 2 is connected to the wireless charging transmitting module 20 via a cable 12. The cable 12 has a certain length and flexibility to provide sufficient rear movement space for the transmitting coil housing 2, allowing the user to easily separate the transmitting coil housing 2 from the receiving coil housing 5 and place it back on the charging rack, while also easily removing it for alignment with the receiving coil housing 5.

[0079] In one specific embodiment of this utility model, the wireless charging transmitter module 20 includes a position detection circuit 47, a transmitter control circuit 22, a transmitter communication circuit 23, and a transmitter charging circuit 21; the transmitter control circuit 22 is connected to the position detection circuit 47, the transmitter communication circuit 23, and the transmitter charging circuit 21 respectively, and the transmitter charging circuit 21 is connected to the transmitter coil 8; the wireless charging receiver module 40 includes a receiver control circuit 42, a receiver communication circuit 43, and a receiver charging circuit 41; the receiver control circuit 42 is connected to the receiver communication circuit 43 and the receiver charging circuit 41 respectively, and the receiver charging circuit 41 is connected to the receiver coil 10; wherein, the transmitter control circuit 22, the transmitter communication circuit 23, the position detection circuit 47, and the transmitter charging circuit 21 are housed within a casing. In practice, the wireless charging transmitter module 20 is integrated into the charging rack. Some or all of the wireless charging receiver module 40 is placed inside or outside the housing. When a user needs to charge the electric vehicle waiting charging device, they only need to remove the transmitter coil housing 2 from the transmitter coil placement piece 13 of the charging rack and insert it into the connector (i.e., the first frame 80). When the position detection circuit 47 detects that the transmitter coil housing 2 and the receiver coil housing 5 are aligned to the preset position, the position detection circuit 47 generates a charging trigger signal. The charging trigger signal is transmitted to the transmitter control circuit 22. The transmitter control circuit 22 controls the transmitter charging circuit 21 to provide power to the transmitter coil 8, so that the transmitter coil 8 and the receiver coil 10 are electromagnetically coupled, and provide power to the receiver charging circuit 41 connected to the receiver coil 10. When the position detection circuit 47 detects that the transmitting coil housing 2 has slightly moved away from the preset position, the position detection circuit 47 generates a power-off trigger signal and transmits it to the transmitting end control circuit 22. The transmitting end control circuit 22 controls the transmitting end charging circuit 21 to stop providing power to the transmitting coil 8, so that the transmitting coil 8 and the receiving coil 10 do not generate electromagnetic coupling, and stop charging the battery 50, while ensuring the safety of the user.

[0080] In one specific embodiment of this utility model, 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 via a cable 12. The cable 12 has a certain length and flexibility, allowing the transmitting coil housing 2 to be removed or returned from 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; 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 8 to generate an electromagnetic field.

[0081] In one specific embodiment of this utility model, the wireless charging transmitter module 20 further includes a transmitter measurement circuit 24 and a transmitter protection circuit 25 connected to the transmitter control circuit 22; both the transmitter measurement circuit 24 and the transmitter protection circuit 25 are connected to the transmitter charging circuit 21; the transmitter measurement circuit 24 is used to detect the charging parameters of the transmitter charging circuit 21 and send them to the transmitter control circuit 22. When the transmitter control circuit 22 determines that the transmitter charging circuit 21 is abnormal (such as overvoltage, overcurrent, or overtemperature) based on the charging parameters, it sends a control signal to the transmitter protection circuit 25, 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, which could lead to damage to the battery 50, power supply 1, or transmitter circuit.

[0082] In one specific embodiment of this utility model, the receiving end charging circuit 41 includes a second resonant circuit and a rectifier filter circuit connected in sequence. The second resonant circuit is connected to the receiving coil 10; the rectifier filter circuit is used to connect to the battery 50.

[0083] In one specific embodiment of this utility model, the wireless charging receiver module 40 further includes a receiver measurement circuit 44 and a receiver protection circuit 45 connected to the receiver control circuit 42; the receiver measurement circuit 44 and / or the receiver protection circuit 45 are disposed inside or outside the receiver coil housing;

[0084] The receiver measurement circuit 44 and the receiver protection circuit 45 are both connected to the receiver charging circuit 41.

[0085] 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 overvoltage, overcurrent, or overtemperature) based on the charging parameters, it sends a control signal to the receiving end protection circuit 45, which then stops the output of the rectifier and filter circuit. In specific implementation, if the battery 50 has a battery management system (BMS) interface, the receiving end control circuit 42 can obtain the charging parameters, battery ID, safe charging voltage and current, and real-time battery 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 rectifier and filter circuit. The ID of battery 50 and other battery 50 parameters are also sent to the transmitter control circuit 22 via the communication module to authenticate the battery 50 parameters and prevent charging of non-standard, expired, mismatched or non-compliant batteries 50.

[0086] In one specific embodiment of this utility model, when the receiving end control circuit 42 determines that the receiving end charging circuit 41 is abnormal based on charging parameters, it also sends a control signal to the receiving end communication circuit 43. This control signal passes sequentially through the transmitting end communication circuit 23 and the transmitting end control circuit 22. The transmitting end control circuit 22 controls the transmitting end charging circuit 21 to stop providing power to the transmitting coil 8. This not only ensures charging convenience but also guarantees charging safety for the user and the vehicle, avoiding safety hazards caused by overvoltage, overcurrent, or overtemperature damage to the battery 50 or the receiving end circuit during charging.

[0087] In one specific embodiment of this utility model, the wireless charging receiver module 40 further includes a receiver switch circuit 46, which is connected to the output terminal of the receiver protection circuit 45 and is located between the rectifier filter circuit and the battery 50. When the receiver protection circuit 45 triggers protection, the receiver protection circuit 45 controls the receiver switch circuit 46 to operate, thereby disconnecting the physical connection between the rectifier filter circuit and the battery 50 to improve the safety performance of the wireless charging device.

[0088] In one specific embodiment of this utility model, the wireless charging transmitter module 20 further includes a transmitter charging status display module, and the wireless charging receiver module 40 further includes a receiver charging status display module. The receiver measurement circuit 44 is used to detect the charging parameters of the receiver charging circuit 41 and send them to the receiver control circuit 42. When the receiver control circuit 42 determines that the receiver charging circuit 41 is abnormal based on the charging parameters, it sends a status display signal to the receiver charging status display module and also sends a status display signal to the receiver communication circuit 43. The status display signal is sent to the transmitter charging status display module after passing through the transmitter communication circuit 23 and the transmitter control circuit 22 in sequence. Different colored LEDs or LEDs with different flashing frequencies can be used to display different charging, standby, and abnormal states.

[0089] In one specific embodiment of this utility model, the wireless charging device further includes a position sensing circuit 26, which helps the position detection circuit 47 quickly and accurately detect whether the transmitting coil housing 2 and the receiving coil housing 5 are aligned to a preset position. The position detection circuit 47 is located outside the transmitting coil housing 2, and the position sensing circuit 26 is located inside the transmitting coil housing 2 and connected to the position detection circuit 47 located 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 effect type; the position sensing circuit can also be a contact-type position sensing circuit, such as a mechanical switch.

[0090] In one specific embodiment of this utility model, 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 connected to the wireless charging transmitting module 20. When a part of the human body (e.g., a finger) touches the transmitting coil housing 2, the human body sensing circuit 27 generates a trigger signal, which is transmitted to the wireless charging transmitting module 20, causing the wireless charging transmitting module 20 to stop providing power to the transmitting coil 8, thus ensuring safe use. This also allows the transmitting module to immediately stop providing power to the transmitting coil 8 when a finger touches the transmitting coil housing 2 before the user unplugs the transmitting coil 8, further enhancing safety. Example 2

[0091] The difference between this embodiment and Embodiment 1 is that the connector includes a first connecting part and a second connecting part that cooperate with each other, and the first connecting part and the second connecting part are respectively disposed on the transmitting coil housing 2 and the receiving coil housing 5. In a specific embodiment of this utility model, as follows... Figure 4As shown, the first connecting part and the second connecting part are the transmitting end magnet module 60 and the receiving end magnet module 61, respectively, and they attract each other. In specific implementation, both the first connecting part and the second connecting part are located inside the transmitting coil housing 2 and the receiving coil housing 5.

[0092] In one specific embodiment of this utility model, such as Figure 5 As shown, the first connecting part is a sliding groove 90; the second connecting part includes a second frame 91 and a second support plate 92; the sliding groove 90 is disposed on the outer wall of the transmitting coil housing 2; the second frame 91 and the second support plate 92 are both disposed on the side of the receiving coil housing 5 for alignment with the transmitting coil housing 2, and the second support 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 engages 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 support plate 92, and then the transmitting coil housing 2 and the receiving coil housing 5 are aligned to the preset position. In specific implementation, the second support plate 92 can be set as an open or hollow structure, so that if rainwater or other foreign objects fall into the groove, they can slide down from the opening or hollow part of the second support plate 92. Figure 5 As shown, the second frame 92 includes two L-shaped plates arranged opposite each other. The thickness of the second frame 92 is about 2-3 mm less than the width of the groove 90, so that the user can engage the groove 90 provided on the transmitting coil housing 2 with the second frame 91 provided on the receiving coil housing 5.

[0093] In one specific implementation of this embodiment, such as Figure 6 As shown, the first connecting part is a buckle 70, which is located on the top of the transmitting coil housing 2; the second connecting part is a slot 71, which is located on the top of the receiving coil housing 5; when the buckle 70 on the transmitting coil housing 2 is engaged with the slot 71 on the receiving coil housing 5, the transmitting coil housing 2 and the receiving coil housing 5 are aligned to the preset position.

[0094] In one specific embodiment of this example, the wireless charging receiver module 40 may be wholly or partially housed within the receiver coil housing 8.

[0095] In one specific embodiment of this example, the receiving coil housing 8 is placed inside the vehicle body shell, the receiving mating surface 11 is mated to the inner side of the vehicle body shell, and a connector is installed on the outer side of the vehicle body shell. When the transmitting coil housing 2 is moved to the vehicle body, 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 mated and well aligned to the preset position by installing the connector. The front surface 3 of the transmitting coil and the front surface 6 of the receiving coil are directly opposite each other and in a matching state. There is a layer of vehicle body shell between the transmitting mating surface 9 and the receiving mating surface 11 of the receiving coil 10, and the vehicle body shell between the transmitting mating surface 9 and the receiving mating surface 11 of the receiving coil 10 is made of non-metallic material.

[0096] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0097] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A wireless charging device, characterized in that: Includes a receiving coil, a receiving coil housing, a transmitting coil, a transmitting coil housing, and connectors; The receiving coil is disposed inside the receiving coil housing; The transmitting coil is located 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 via the connector, the transmitting coil and the receiving coil are facing each other and in a matched state, and the gap and offset between the transmitting coil and the receiving coil are less than or equal to a set threshold.

2. The wireless charging device according to claim 1, characterized in that: The connector is located on the housing of the receiving coil.

3. A wireless charging device according to claim 2, characterized in that: The connector includes an independently set first frame and a first support plate, both of which are located 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 support plate, and then the transmitting coil housing and the receiving coil housing are aligned to the preset position.

4. A wireless charging device according to claim 3, characterized in that: The first tray is configured with an open or hollow structure.

5. A wireless charging device according to claim 1, characterized in that: The connector includes a first connecting part and a second connecting part that cooperate with each other, and the first connecting part and the second connecting part are respectively disposed on the transmitting coil housing and the receiving coil housing.

6. A wireless charging device according to claim 5, characterized in that: The first connecting part and the second connecting part are the transmitter magnet module and the receiver magnet module, respectively, and they attract each other.

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

8. A wireless charging device according to claim 5, characterized in that: The first connecting part is a slide groove; the second connecting part includes a second frame and a second support plate; The groove is provided on the outer wall of the transmitting coil housing; The second frame and the second tray are both provided on the side of the receiving coil housing for alignment with the transmitting coil housing, and the second tray 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 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 then the transmitting coil housing and the receiving coil housing are aligned to the preset position.

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

10. A wireless charging device according to claim 5, characterized in that: The first connecting part is a snap fastener, located on the top of the transmitting coil housing; the second connecting part is a slot, located on the top of the receiving coil housing. When the clip on the transmitting coil housing engages with the slot on the receiving coil housing, the transmitting coil housing and the receiving coil housing are aligned to the preset position.

11. A wireless charging device according to claim 1, characterized in that: The wireless charging device further includes a wireless charging transmitter module and a wireless charging receiver module; the wireless charging transmitter module includes a position detection circuit. When the position detection circuit detects that the transmitting coil housing and the receiving coil housing are aligned to a preset position, the position detection circuit generates a charging trigger signal, causing the wireless charging transmitting module to provide power to the transmitting coil, further causing the transmitting coil and the receiving coil to generate electromagnetic coupling, and providing 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 preventing electromagnetic coupling between the transmitting coil and the receiving coil.

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 inside the transmitting coil housing and connected to the position detection circuit. The position sensing circuit is used to detect whether the positions of the transmitting coil and the receiving coil are matched and to send a signal. The position detection circuit 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. A wireless charging device according to claim 11, characterized in that: The wireless charging device also includes a human body sensing circuit, which is placed inside 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, causing the wireless charging transmitting module to stop providing power to the transmitting coil.

15. A wireless charging device according to claim 1, characterized in that: The transmitting coil housing has a transmitting contact surface; the receiving coil housing has a receiving contact surface; the transmitting coil includes a transmitting coil front side and a transmitting coil back side disposed opposite to each other; the receiving coil includes a receiving coil front side and a receiving coil back side disposed opposite to each other; The front of the transmitting coil is parallel to the transmitting contact surface, and the gap between them is less than a set second threshold. The front of the receiving coil is parallel to the receiving contact surface, and the gap between them is less than a set third threshold. When the transmitting and receiving surfaces are aligned to the preset position via the connector, the front of the transmitting coil and the front of the receiving coil are directly opposite each other and in a matching state.

16. A wireless charging device according to claim 15, characterized in that: The values ​​of the second and third thresholds are both in the range of 2~4mm.

17. A wireless charging device according to claim 15, characterized in that: The receiving coil housing is placed inside the outer shell of the device to be charged, with the receiving contact surface touching the inner side of the outer shell of the device to be charged. The connector is installed on the outer side of the outer shell of the device to be charged. When the transmitting coil housing is moved to the device to be charged, the transmitting contact surface of the transmitting coil housing and the receiving contact surface of the receiving coil can be well attached and well aligned to the preset position by installing the connector. The front of the transmitting coil faces the front of the receiving coil and is in a matching state. There is a layer of the outer shell of the device to be charged between the transmitting contact surface and the receiving contact surface of the receiving coil. The outer shell of the device to be charged between the transmitting contact surface and the receiving contact surface of the receiving coil is made of non-metallic material.

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

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