Wireless charging device

Abstract

The invention discloses a wireless charging device. The wireless charging device comprises a receiving coil, a shell and a transmitting coil, an insertion opening is formed in the end part of the shell; when the transmitting coil completely enters the interior of the shell from the insertion opening, the transmitting coil is fixed by the insertion opening, the transmitting coil and the receiving coil directly face each other and are in a matched state, and the gap and the offset between the transmitting coil and the receiving coil are smaller than or equal to a set threshold value. According to the 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, etc. 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 safety hazard risk of fire caused by overload, short circuit, poor quality, electric shock and sparking, etc. Since it is difficult to regulate users and inspect the wired charging devices, 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 prevents users from using their own wired chargers, fundamentally eliminating the above-mentioned safety hazards caused by non-compliant or unsafe wired chargers used by 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 is usually installed at a certain part of the battery car. When the vehicle stops, the transmitting coil and the receiving coil will be aligned within a certain range. In this way, without contact, an electromagnetic field is generated by the transmitting coil, and through the electromagnetic induction between the transmitting coil and the receiving coil, the receiving coil 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, it also has some disadvantages, mainly including: 1. Misalignment between the transmitting coil and the receiving coil: The wireless charging system depends on the alignment of the receiving coil of the battery car and the facing transmitting coil. 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 metal foreign objects: During the charging process, due to the possible large gap between the transmitting coil and the receiving coil, when metal foreign objects exist between the two coils, these metal 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 metal foreign objects.

[0006] 3. To ensure a certain degree of freedom in 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, thereby increasing the intensity and range of electromagnetic radiation. Electromagnetic radiation includes radiation to the human body or living things around the coil, as well as electromagnetic interference to surrounding electronic devices. For the freedom of vehicle parking, it is also very difficult to install structural parts 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 coil 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 brought by electromagnetic radiation and metal 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] In order 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, comprising a receiving coil, a housing and a transmitting coil; An insertion port is provided at the end of the housing; After the transmitting coil completely enters the interior of the housing from the insertion opening, the insertion opening fixes the transmitting coil. The transmitting coil faces the receiving coil and is in a matching state, and the gap and offset between the two are less than or equal to a set threshold.

[0012] Optionally, the side wall of the insertion opening is parallel to or forms an angle with the front wall of the housing; after the transmitting coil completely enters the interior of the housing from the insertion opening, the transmitting coil is parallel to or forms an angle with the front wall of the housing.

[0013] Optionally, a chute corresponding to the insertion opening is provided on the inner wall of the housing. The chute is parallel to or forms an angle with the front wall of the housing and is used to accommodate and fix the transmitting coil.

[0014] Optionally, the angle is ±15° to 60°.

[0015] Optionally, the insertion opening is located at the top of the housing; the bottom of the housing is a hollow structure or is provided with an opening.

[0016] Optionally, the transmitting coil is provided with a lid. After the transmitting coil completely enters the interior of the housing from the insertion opening, the lid closes the insertion opening on the housing.

[0017] Optionally, the wireless charging device further includes a transmitting coil placement member for placing the transmitting coil.

[0018] Optionally, the side wall of the housing is provided with an electromagnetic shielding material or a metal material.

[0019] Optionally, the electromagnetic shielding material is a ferrite soft magnetic material, an amorphous nanocrystalline material, or an alloy soft magnetic material.

[0020] Optionally, the receiving coil is placed inside or outside the housing.

[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 is inserted into a preset position inside the housing, 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 has left the preset position within the housing, the position detection circuit generates a power-off trigger signal to cause the wireless charging transmitting module to stop supplying power to the transmitting coil, further causing no electromagnetic coupling between the transmitting coil and the receiving coil.

[0023] Optionally, part or all of the wireless charging receiving module is disposed inside or outside the housing.

[0024] Optionally, part or all of the wireless charging transmitting module is placed on the back of the transmitting coil.

[0025] Optionally, the wireless charging device further includes a position sensing circuit for assisting the position detection circuit to detect whether the transmitting coil reaches or leaves the preset position within the housing when inserted into or removed from the housing.

[0026] Optionally, the position sensing circuit is disposed inside the transmitting coil or in a lid connected to the transmitting coil and is connected to the position detection circuit.

[0027] Optionally, both the receiving coil and the wireless charging receiving module are disposed inside the housing of the device to be charged. The housing with the insertion port is disposed outside the housing of the device to be charged but is mounted on the housing of the device to be charged and is directly opposite to the front of the receiving coil. The receiving coil is close to the back of the housing. When the transmitting coil is inserted into the housing through the insertion port, the front of the transmitting coil and the front of the receiving coil inside the device to be charged can be well matched.

[0028] Optionally, a soft cover made of a material with a certain elasticity and softness is installed at a position on the housing near the insertion port. The soft cover is provided with a main opening of the soft cover, and the length of the main opening of the soft cover is slightly greater than the length of the insertion port. When the transmitting coil is inserted into the insertion port, the main opening of the soft cover will open. When the transmitting coil is removed from the insertion port, the main opening of the soft cover will naturally close due to its own elasticity.

[0029] Optionally, the soft cover is provided with a plurality of vertical openings perpendicular to the main opening of the soft cover.

[0030] 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 significantly reduce electromagnetic radiation, thereby ensuring charging safety and reducing the manufacturing cost of the charging system while ensuring the charging efficiency.

[0031] In the present invention, the gap between the transmitting coil and the receiving coil can be very close (<5 mm), with strong coupling. Thus, a coil with a very small area can provide and receive the designed power.

[0032] In the present invention, charging is carried out by inserting the transmitting coil into the gap on the side of the receiving coil, and there is a certain angle between the insertion port on the housing and the front wall of the housing. Due to the action of gravity, the position of the transmitting coil can slide to the bottom and lean towards the receiving coil. The gap and relative position with the receiving coil are basically fixed, leaving a very small margin (a few millimeters) for easy insertion and extraction. Misalignment can be basically eliminated, and it has a strong coupling coefficient. Thus, without increasing the area of the transmitting coil, the smaller transmitting coil has a smaller volume and weight, and also ensures the convenience of insertion and repositioning. At the same time, the strong coupling coefficient and the small coil area also reduce the intensity and range of electromagnetic radiation.

[0033] The insertion port in the present invention is provided at the top of the housing (with the opening facing upwards), enabling users to more conveniently pick up the transmitting coil and insert it into the housing to charge electric vehicles, etc.

[0034] The transmitting coil in the present invention is equipped with a lid. After the transmitting coil is inserted, it closes the insertion port on the housing, preventing foreign objects from entering. Therefore, foreign object detection only needs to be carried out before charging, rather than during charging, which greatly reduces the difficulty of foreign object detection. At the same time, if foreign objects enter the insertion port when not charging, the hollow design or opening design at the bottom of the housing and the installation angle can also cause the foreign objects to slide out.

[0035] When the position detection circuit in the present invention detects that the transmitting coil is inserted in place, it sends a trigger signal to the wireless charging transmitting module, enabling the wireless charging transmitting module to supply electrical energy to the transmitting coil. When the transmitting coil is slightly pulled out by an 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 supplying electrical energy to the transmitting coil, ensuring the safety of use.

[0036] The present invention also has a transmitting coil placement member, which is used to be installed on a charging rack. Users can conveniently place the transmitting coil back on the charging rack and also conveniently take it off and insert it into the receiving housing. Description of the Drawings

[0037] 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 described below 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 is the principle block diagram of a wireless charging device according to an embodiment of the present invention; Figure 2 Front view of a wireless charging device according to an embodiment of the present invention; Figure 3 Rear view of a wireless charging device according to an embodiment of the present invention; Figure 4 Side view of a wireless charging device according to an embodiment of the present invention in a charging state; Figure 5 Schematic diagram of the internal structure of a wireless charging device according to an embodiment of the present invention in a charging state; Figure 6 Schematic diagram of a wireless charging device according to an embodiment of the present invention in a charging state; Figure 7 Side view of a wireless charging device according to an embodiment of the present invention; Figure 8 Structural diagram of a soft cover according to an embodiment of the present invention; Wherein: 1 - power supply, 2 - housing, 3 - cable, 4 - bottom of the housing, 5 - lid, 6 - transmitting coil, 7 - insertion port, 8 - receiving coil, 9 - transmitting coil placement member, 10 - wireless charging transmitting module, 11 - transmitting end charging circuit, 12 - transmitting end control circuit, 13 - transmitting end communication circuit, 14 - transmitting end measurement circuit, 15 - transmitting end protection circuit, 16 - position detection circuit, 20 - wireless charging receiving module, 21 - receiving end charging circuit, 22 - receiving end control circuit, 23 - receiving end communication circuit, 24 - receiving end measurement circuit, 25 - receiving end protection circuit, 26 - receiving end switch circuit, 30 - battery, 40 - soft cover, 41 - main opening of the soft cover, 42 - vertical opening, 50 - housing of the vehicle, 70 - included angle, 71 - front wall of the housing, 72 - side wall of the insertion port, 80 - front side of the transmitting coil, 81 - back side of the transmitting coil, 82 - front side of the receiving coil, 83 - back side of the receiving coil. Detailed implementation manners

[0038] 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 restrictive of the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said 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 construed 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 like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0040] In the description of the present invention, the meaning of "several" is more than one, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present 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 indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0041] 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", etc. 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.

[0042] The application principle of the present invention will be described in detail below with reference to the drawings.

[0043] As Figures 1 - 6 shown, a wireless charging device is provided in the present invention, including a receiving coil 8, a housing 2, and a transmitting coil 6; One side of the transmitting coil is the front surface 80 of the transmitting coil, and the opposite side is the back surface 81 of the transmitting coil; One side of the receiving coil is the front surface 82 of the receiving coil, and the opposite side is the back surface 83 of the receiving coil; The end of the housing 2 is provided with an insertion port 7; in the specific implementation process, the housing 2 can be set to have good electrical insulation characteristics and certain mechanical strength; the transmitting coil 6 is provided with a protective housing; the protective housing has certain mechanical strength to protect the transmitting coil 6 and the possibly built-in circuit arranged inside it, and at the same time the protective housing also has good electrical insulation characteristics; when the transmitting coil 6 completely enters the inside of the housing 2 from the insertion port 7, the insertion port 7 fixes the transmitting coil 6, the transmitting coil 6 and the receiving coil 8 are in a matching state, and the gap and offset between the two are less than or equal to the set threshold. In the specific implementation process, the matching state may refer to that the front surface 80 of the transmitting coil is in a facing state with the front surface 82 of the receiving coil, the coupling coefficient between the transmitting coil 6 and the receiving coil 8 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 6 and the receiving coil 8 can be set to <5 mm, with strong coupling, so that a very small area of the coil can provide and receive the designed power. With strong coupling, a relatively small electromagnetic field can cause the transmitting coil to couple to sufficient energy and reach the designed output power. A smaller electromagnetic field and a smaller coil area mean that the transmitting coil only needs a smaller current, thus generating a smaller electromagnetic radiation intensity and radiation range.

[0044] 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, thereby ensuring charging safety and reducing the manufacturing cost of the charging system while ensuring the charging efficiency.

[0045] In a specific embodiment of the present invention, the side wall 72 of the insertion port 7 is parallel to or has an included angle 70 with the front wall 71 of the housing 2; when the transmitting coil 6 completely enters the inside of the housing 2 from the insertion port 7, the transmitting coil 6 is parallel to or has an included angle 70 with the front wall 71 of the housing 2. It can be seen that in the present invention, charging is carried out by inserting the transmitting coil 6 and making the front surface 80 of the transmitting coil face the front surface 82 of the receiving coil, and the side wall 72 of the insertion port 7 of the housing 2 forms a certain angle 70 with the front wall 71 of the housing 2. The position of the transmitting coil 6 can be basically fixed due to the action of gravity, leaving a very small margin (a few millimeters) for easy insertion and extraction, and misalignment can be basically eliminated, so that it is not necessary to increase the area of the transmitting coil 6 and it is convenient for foreign objects to slide out. In the specific implementation process, the included angle is ±15~60°, and this angle can help the transmitting coil 6 to approach the receiving coil 8 naturally due to the action of gravity after insertion, reducing the gap or the range of gap change between the transmitting coil 6 and the receiving coil 8.

[0046] In a specific embodiment of the present invention, a chute corresponding to the insertion port 7 is provided on the inner wall of the housing 2. The chute is parallel to or forms an angle with the front wall of the housing 2 and is used to accommodate and fix the transmitting coil 6. It can be seen that in the present invention, charging is carried out by inserting the transmitting coil 6 directly opposite the receiving coil 8. The side wall 72 of the insertion port 7 of the housing 2 forms a certain angle with the front wall 71 of the housing 2. The position of the transmitting coil 6 can be basically fixed due to the action of gravity, leaving a very small margin (a few millimeters) for easy insertion and extraction, and misalignment can be basically eliminated. Thus, there is no need to increase the area of the transmitting coil 6, and it is convenient for foreign objects to slide out. In the specific implementation process, the angle is ±15 to 60°. This angle can help the transmitting coil 6 naturally press against the receiving coil 8 due to the action of gravity after insertion, reducing the gap or the range of gap change between the transmitting coil 6 and the receiving coil 8.

[0047] In a specific embodiment of the present invention, the insertion port 7 is located at the top of the housing 2, that is, the insertion port 7 of the housing 2 faces upward, making it more convenient for the user to insert and take out the transmitting coil 6 to charge charging devices such as electric vehicles. And the transmitting coil 6 can naturally slide to the bottom due to the action of gravity, and its relative position with the receiving coil 8 is basically fixed; the bottom 4 of the housing 2 is a hollow structure or has an opening at the bottom. If rainwater or other foreign objects fall into the housing 2, they can slide out from the bottom 4 of the housing 2.

[0048] In a specific embodiment of the present invention, the transmitting coil 6 is provided with a cover 5. After the transmitting coil 6 completely enters the interior of the housing 2 from the insertion port 7, the cover 5 closes the insertion port 7 on the housing 2. Therefore, during specific use, foreign object detection only needs to be performed before charging, rather than during charging, greatly reducing the difficulty of foreign object detection. At the same time, when the transmitting coil is inserted and in place, since the relative positions of the two coils are relatively fixed, many electrical parameters for detecting metal foreign objects are also relatively fixed and consistent, which enables the change threshold of the electrical parameters caused by metal foreign objects to be relatively determined, reducing the difficulty of metal foreign object detection. Further, when the transmitting coil is inserted into the housing 2, metal foreign objects can be scraped off by the opening of the insertion port 7. When the transmitting coil is inserted into the housing 2 and in place, since there is only a very small gap between the side wall 72 of the socket and the transmitting coil 6, even if metal foreign objects are brought in, only very small metal foreign objects can be accommodated, such as staples. Even if the small metal foreign objects are undetected, due to the small area and volume of the metal foreign objects, and because the coils in the present invention have strong coupling, only a small magnetic field intensity is required to transmit sufficient power to the output, so the small metal foreign objects generate very small eddy currents in a small-intensity magnetic field, thus not causing a high temperature rise and not becoming a potential hazard. Additionally, when the transmitting coil 6 is not inserted into the housing 2, if foreign objects enter the insertion port 7, the hollow design or opening design of the bottom 4 of the housing and the installation angle can also cause the foreign objects to slide out of the housing 2.

[0049] Whether to add magnetic materials, such as ferrite, to the back surface 81 of the transmitting coil and the back surface 83 of the receiving coil can be selected to enhance the coupling coefficient when the two coils face each other and shield the magnetic field within the two coils.

[0050] In a specific embodiment of the present invention, electromagnetic shielding materials or metal materials can be added to some or all of the side walls of the 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 housing 2, but also shield the electromagnetic interference from the environment and surrounding electronic devices to the internal circuit of the housing, increasing the reliability of the internal circuit of the housing. The electromagnetic shielding materials can be soft magnetic ferrite materials with high magnetic permeability, amorphous nanocrystalline materials, and alloy soft magnetic materials composed of iron, cobalt, nickel, manganese, etc. The metal materials can be materials such as copper, aluminum, and stainless steel.

[0051] In a specific embodiment of the present invention, the receiving coil 8 is provided inside or outside the housing 2. During the specific implementation process, the housing 2 can be installed at the front or other parts of the charging device such as an electric vehicle waiting for charging.

[0052] In a specific embodiment of the present invention, the wireless charging device further includes a wireless charging transmitting module 10 and a wireless charging receiving module 20; the wireless charging transmitting module 10 is connected to the transmitting coil 6 through a cable 3. During charging, the alternating current generated by the wireless charging transmitting module 10 is transmitted to the transmitting coil 6 through the cable 3. The wireless charging receiving module 20 is connected to the receiving coil 8. The electric energy induced by the receiving coil 8 is transmitted to the wireless charging receiving module 20. The wireless charging transmitting module 10 includes a position detection circuit 16. When the position detection circuit 16 detects that the transmitting coil 6 is inserted into a preset position inside the housing 2, the position detection circuit 16 generates a charging trigger signal to cause the wireless charging transmitting module 10 to supply power to the transmitting coil 6, further causing the transmitting coil 6 and the receiving coil 8 to generate electromagnetic coupling, and supplying power to the wireless charging receiving module 20 connected to the receiving coil 8.

[0053] In a specific embodiment of the present invention, when the position detection circuit 16 detects that the transmitting coil 6 leaves the preset position inside the housing 2, the position detection circuit 16 generates a power-off trigger signal to cause the wireless charging transmitting module 10 to stop supplying power to the transmitting coil 6, further causing the transmitting coil 6 and the receiving coil 8 not to generate electromagnetic coupling.

[0054] In a specific embodiment of the present invention, the wireless charging device further includes a transmitting coil placement member 9 for placing the transmitting coil 6. During the specific implementation process, the transmitting coil placement member 9 is arranged on the charging rack and placed beside the wireless charging transmitting module 10, and is connected to the wireless charging transmitting module 10 through a cable 3. The cable 3 has a certain length and flexibility to provide sufficient movement space for the transmitting coil 6. Users can conveniently pull out the transmitting coil 6 from inside the housing 2 and put it back on the charging rack, and can also conveniently remove and insert it into the housing 2.

[0055] In a specific embodiment of the present invention, the wireless charging transmitting module 10 includes a position detection circuit 16, a transmitting end control circuit 12, a transmitting end communication circuit 13, and a transmitting end charging circuit 11; the transmitting end control circuit 12 is respectively connected to the position detection circuit 16, the transmitting end communication circuit 13, and the transmitting end charging circuit 11, and the transmitting end charging circuit 11 is connected to the transmitting coil 6; the wireless charging receiving module 20 includes a receiving end control circuit 22, a receiving end communication circuit 23, and a receiving end charging circuit 21; the receiving end control circuit 22 is respectively connected to the receiving end communication circuit 23 and the receiving end charging circuit 21, and the receiving end charging circuit 21 is connected to the receiving coil 8; wherein, the transmitting end control circuit 12, the transmitting end communication circuit 13, the position detection circuit 16, and the transmitting end charging circuit 11 are placed outside the housing 2;; In the specific implementation process, the wireless charging transmitting module 10 is integrated on the charging rack; some or all of the wireless charging receiving module 20 are placed inside or outside the housing 2; when the user needs to charge a charging device such as an electric vehicle, only need to remove the transmitting coil 6 from the transmitting coil placement part 9 of the charging rack and insert it into the insertion port 7 of the housing 2. When the position detection circuit 16 detects that the transmitting coil 6 is inserted into the preset position inside the housing 2, the position detection circuit 16 generates a charging trigger signal, and the charging trigger signal is transmitted to the transmitting end control circuit 12. The transmitting end control circuit 12 controls the transmitting end charging circuit 11 to provide electrical energy for the transmitting coil 6, so that the transmitting coil 6 and the receiving coil 8 generate electromagnetic coupling, and provide electrical energy for the receiving end charging circuit 21 connected to the receiving coil 8. When the position detection circuit 16 detects that the transmitting coil 6 slightly leaves the preset position inside the housing 2, the position detection circuit 16 generates a power-off trigger signal and transmits it to the transmitting end control circuit 12. The transmitting end control circuit 12 controls the transmitting end charging circuit 11 to stop providing electrical energy for the transmitting coil 6, so that the transmitting coil 6 and the receiving coil 8 do not generate electromagnetic coupling, stop charging the battery, and ensure the safety of user use at the same time.

[0056] In a specific embodiment of the present invention, the transmitting end charging circuit 11 includes a charging interface, an inverter circuit, and a first resonant circuit connected in sequence; the first resonant circuit is connected to the transmitting coil 6 through a cable 3. The cable 3 has a certain length and flexibility so that the transmitting coil 6 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 6 to generate an electromagnetic field.

[0057] In a specific embodiment of the present invention, the wireless charging transmitting module 10 further includes a transmitting end measurement circuit 14 and a transmitting end protection circuit 15 connected to the transmitting end control circuit 12; Both the transmitting end measurement circuit 14 and the transmitting end protection circuit 15 are connected to the transmitting end charging circuit 11; The transmitting end measurement circuit 14 is used to detect the charging parameters of the transmitting end charging circuit 11 and send them to the transmitting end control circuit 12. When the transmitting end control circuit 12 determines that the transmitting end charging circuit 11 is abnormal (such as overvoltage, overcurrent or overheating), it sends a control signal to the transmitting end protection circuit 15, and the transmitting end protection circuit 15 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 vehicles, avoiding potential safety hazards caused by battery damage, power supply or transmitting end circuit damage due to overvoltage, overcurrent or overheating during charging.

[0058] In a specific embodiment of the present invention, the receiving end charging circuit 21 is disposed inside or outside the housing 2 and includes a second resonant circuit and a rectifying and filtering circuit connected in sequence. The second resonant circuit is connected to the receiving coil 8; the rectifying and filtering circuit is used to be connected to the battery 30.

[0059] In a specific embodiment of the present invention, the wireless charging receiving module 20 further includes a receiving end measurement circuit 24 and a receiving end protection circuit 25 connected to the receiving end control circuit 22; the receiving end measurement circuit 24 and / or the receiving end protection circuit 25 are disposed inside or outside the housing 2; wireless charging receiving module Both the receiving end measurement circuit 24 and the receiving end protection circuit 25 are connected to the receiving end charging circuit 21; The receiving - end measurement circuit 24 is used to detect the charging parameters of the receiving - end charging circuit 21 and send them to the receiving - end control circuit 22. When the receiving - end control circuit 22 determines that the receiving - end charging circuit 21 or the battery is abnormal (such as over - voltage, over - current, or over - temperature) based on the charging parameters, it sends a control signal to the receiving - end protection circuit 25, and the receiving - end protection circuit 25 stops the output of the rectifying and filtering circuit. In a specific implementation process, if the battery has a Battery Management System (BMS) interface, the receiving - end control circuit 22 can obtain the charging parameters of the battery, the ID of the battery, the safe charging voltage and current of the battery, and the real - time battery temperature through the connection with the battery BMS interface. During charging, the receiving - end control circuit 22 communicates with the BMS and sends the data obtained from the BMS to the transmitting - end control circuit 12. According to the requirements of the BMS, the transmitting - end control circuit 12 controls the safe charging voltage and current. When the temperature of the battery exceeds the safe temperature, the receiving - end protection circuit 25 stops the output of the rectifying and filtering circuit. The ID of the battery and other battery parameters are also sent to the transmitting - end control circuit 12 through the communication module to authenticate the battery parameters and prevent charging non - regular, expired, mismatched, or non - compliant batteries.

[0060] In a specific embodiment of the present invention, when the receiving - end control circuit 22 determines that the receiving - end charging circuit 21 is abnormal based on the charging parameters, it also sends a control signal to the receiving - end communication circuit 23. The control signal passes through the transmitting - end communication circuit 13 and the transmitting - end control circuit 12 in sequence, and the transmitting - end control circuit 12 controls the transmitting - end charging circuit 11 to stop providing electrical energy to the transmitting coil 6. 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 damage or receiving - end circuit damage due to over - voltage, over - current, or over - temperature during charging.

[0061] In a specific embodiment of the present invention, the wireless charging receiving module 20 further includes a receiving - end switch circuit 26. The receiving - end switch circuit 26 is connected to the output end of the receiving - end protection circuit 25 and is disposed between the rectifying and filtering circuit and the battery. When the receiving - end protection circuit 25 triggers protection, the receiving - end protection circuit 25 controls the receiving - end switch circuit 26 to act, so that the physical connection between the rectifying and filtering circuit and the battery is disconnected, thereby improving the safety performance of the wireless charging device.

[0062] In a specific embodiment of the present invention, the wireless charging transmitting module 10 further includes a transmitting - end charging status display module, and the wireless charging receiving module 20 further includes a receiving - end charging status display module. The receiving - end measurement circuit 24 is used to detect the charging parameters of the receiving - end charging circuit 21 and send them to the receiving - end control circuit 22. When the receiving - end control circuit 22 determines that the receiving - end charging circuit 21 is abnormal based on the charging parameters, it sends a status display signal to the receiving - end charging status display module, and at the same time, it also sends a status display signal to the receiving - end communication circuit 23. The status display signal is sent to the transmitting - end charging status display module after passing through the transmitting - end communication circuit 13 and the transmitting - end control circuit 12 in sequence. Different charging, standby, and abnormal states can be displayed using LEDs of different colors or LEDs with different blinking frequencies, etc.

[0063] In a specific embodiment of the present invention, the wireless charging device further includes a position - sensing circuit, which is used to assist the position - detection circuit 16 in detecting whether the transmitting coil 6 reaches or leaves a preset position inside the housing 2 when it is inserted into or pulled out of the housing 2. The position - sensing circuit is placed inside the transmitting coil 6 or inside the lid 5 and is connected to the position - detection circuit 16. The position - sensing circuit 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.

[0064] In a specific embodiment of the present invention, part of the circuit of the wireless - charging receiving module 20 is placed inside the housing 2, and the rest of the circuit is placed outside the housing 2, for example, inside the vehicle body.

[0065] In a specific embodiment of the present invention, only the receiving coil is placed inside the housing 2, and all circuits in the wireless - charging receiving module 20 are placed outside the housing 2, for example, inside the vehicle body.

[0066] In a specific embodiment of the present invention, the receiving coil 8 and the wireless - charging receiving module 20 are both placed inside the vehicle housing 50. The housing 2 with the insertion port 7 is placed outside the vehicle housing 50 but is mounted on the vehicle housing 50 and is directly opposite to the front of the receiving coil 82. The receiving coil 8 is close to the back of the housing 2. When the transmitting coil 6 is inserted into the housing 2 through the insertion port 7, the front 80 of the transmitting coil and the front 82 of the receiving coil inside the vehicle body can be well - matched. And the vehicle housing between the housing 2 and the receiving coil 8 is made of non - metallic material.

[0067] In a specific embodiment of the present invention, the transmitting coil 6 is a transmitting coil with only a protective housing. All circuits in the wireless - charging transmitting module 10 are placed in another one or more modules and are connected to the transmitting coil 6 through the cable 3. This can reduce the weight of the transmitting coil 6 and the thickness of the transmitting coil 6.

[0068] In a specific embodiment of the present invention, all or part of the circuits in the wireless charging transmitting module 10 are placed on the back surface 81 of the transmitting coil and combined in a module with a protective case, and inserted into the housing 2.

[0069] In a specific embodiment of the present invention, a soft cover 40 made of a material with certain elasticity and softness is provided at the insertion opening 7 of the housing 2. In the specific implementation process, the soft cover 40 is installed on the upper part and the periphery of the insertion opening 7. A main soft cover opening 41 that is aligned and parallel to the middle position of the housing insertion opening 7 is provided in the middle of the soft cover 40, and the length of the main soft cover opening 41 is slightly greater than the length of the insertion opening 7. Optionally, the soft cover 40 is provided with a plurality of vertical openings 42 perpendicular to the main soft cover opening to increase the flexibility of the main soft cover opening 41. When the transmitting coil 6 is inserted into the insertion opening 7, due to the external force and the flexibility of the soft cover, the main soft cover opening 41 will open and does not hinder the insertion of the transmitting coil 6. Due to the elasticity of the soft cover, during the insertion process of the transmitting coil 6, the main soft cover opening 41 can sweep away possible foreign objects, dust, water droplets, etc. on the transmitting coil 6, and the foreign objects include metal foreign objects. After the transmitting coil 6 is pulled out, the main soft cover opening 41 will naturally close due to its own elasticity, which can prevent foreign objects, dust, and water droplets from entering the housing 2. Therefore, the soft cover can effectively prevent metal foreign objects from entering the housing 2, can also effectively remove the metal foreign objects that the transmitting coil 6 may bring in, reduce the requirements for detecting metal foreign objects, and ensure the safety of charging at the same time.

[0070] In summary, based on the wireless charging device in the present invention, the disadvantages of the original wireless charging system, such as reduced charging efficiency and increased manufacturing cost due to coil misalignment, have been improved. At the same time, the risk of damage to the charging system and charging safety caused by the heating of metal foreign objects is reduced, and electromagnetic radiation is reduced. The present invention also ensures charging safety, charging efficiency, and reduces the overall cost.

[0071] In the description of the present 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 therefore cannot be understood as a limitation to the protection scope of the present invention.

[0072] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate 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 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 shell and a transmitting coil; An insertion port is provided at the end of the shell; When the transmitting coil is completely inserted into the shell through the insertion port, the insertion port fixes the transmitting coil, the transmitting coil and the receiving coil are directly opposite and in a matching state, and the gap and offset between the two are less than or equal to a set threshold.

2. A wireless charging device according to claim 1, characterized in that: The side wall of the insertion port is parallel to or has an angle with the front wall of the shell; when the transmitting coil completely enters the interior of the shell from the insertion port, the transmitting coil is parallel to or has an angle with the front wall of the shell.

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

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

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

6. The wireless charging device according to claim 1, characterized in that: The transmitting coil is provided with a cover, and when the transmitting coil is completely inserted into the interior of the shell from the insertion opening, the cover closes the insertion opening on the shell.

7. The wireless charging device according to claim 1, characterized in that: The wireless charging device also includes a transmitting coil placement piece for placing the transmitting coil.

8. The wireless charging device according to claim 1, characterized in that: The side wall of the shell is provided with electromagnetic shielding material or metal material.

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

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

11. A wireless charging device according to claim 1 or 10, characterized in that: The wireless charging device further includes a wireless charging 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 is inserted into a preset position in the shell, 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 leaves the preset position in the shell, 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, further preventing the transmitting coil from generating electromagnetic coupling with the receiving coil.

13. The wireless charging device according to claim 11, characterized in that: The wireless charging receiving module is partially or completely arranged inside or outside the shell.

14. The wireless charging device according to claim 11, characterized in that: The wireless charging transmitting module is partially or completely placed on the back of the transmitting coil.

15. The wireless charging device according to claim 11, characterized in that: The wireless charging device also includes a position sensing circuit for helping the position detection circuit detect whether the transmitting coil reaches or leaves a preset position in the shell when being inserted into or removed from the shell.

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

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

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

19. A wireless charging device according to claim 18, characterized in that: The soft cover is provided with a plurality of vertical openings which are perpendicular to the main opening of the soft cover.

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