Magnetic core and wireless charging device

Abstract

A magnetic core, comprising a first magnetic core layer and a second magnetic core layer, wherein the magnetic core and a first metal member are located on the same side of a first surface of a second metal member; the first magnetic core layer and the first metal member overlap in a direction toward the first surface; the second magnetic core layer and the first metal member are completely staggered in the direction toward the first surface; and a coil is provided on the side of the magnetic core facing away from the second metal member. The present application reduces the thickness of the overall structure while ensuring that eddy currents on metal members are reduced.

Description

A magnetic core and wireless charging device

[0001] This application claims priority to Chinese Patent Application No. 202411956004.7, filed with the State Intellectual Property Office of China on December 25, 2024, entitled “A Magnetic Core and a Wireless Charging Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the fields of electronic devices and wireless charging, and more specifically, to magnetic cores, wireless charging devices, and systems. Background Technology

[0003] Wireless charging is now widely used, providing users with a more convenient charging experience. Compared to wired charging, the coil module required for wireless charging adds thickness to the device. To achieve a thin and light design, existing devices generally use nanocrystalline magnetic cores with high saturation magnetic flux density for coupling enhancement and magnetic field shielding.

[0004] In existing architectures, eddy currents on metal components (such as coils and batteries) can be reduced during wireless charging using magnetic cores, but this takes up a lot of space. Summary of the Invention

[0005] This application provides a magnetic core and a wireless charging device that reduces the overall structural thickness while minimizing eddy currents in the metal parts.

[0006] In a first aspect, this application provides a magnetic core, comprising: a first magnetic core layer and a second magnetic core layer; wherein the magnetic core and a first metal member are located on the same side of a first surface of the second metal member; the first magnetic core layer and the first metal member overlap in the direction toward the first surface; the second magnetic core layer and the first metal member are completely offset in the direction toward the first surface; and a coil is disposed on the side of the magnetic core facing away from the second metal member.

[0007] In existing technologies, to minimize eddy currents on the metal components, each core layer in the magnetic core completely covers the second metal component or simultaneously covers both the first and second metal components. This results in a relatively large module thickness (the sum of the thickness of the first metal component, the thickness of the magnetic core, and the thickness of the second metal component) in the direction towards the first surface. In this embodiment, to reduce eddy currents on the second metal component during wireless charging, a portion of the magnetic core layer (the first magnetic core layer) in the magnetic core can overlap with the first metal component in the direction towards the first surface. To reduce the module thickness, a portion of the magnetic core layer (the second magnetic core layer) in the magnetic core can be completely offset from the first metal component in the direction towards the first surface. This results in a smaller module thickness in the direction towards the first surface (the sum of the thickness of the first metal component, the thickness of the overlapping magnetic core layer in the direction towards the first surface, and the thickness of the second metal component). This reduces the overall structural thickness while ensuring reduced eddy currents on the metal components.

[0008] Optionally, in order to improve the reduction effect of eddy currents on the first metal part, the first magnetic core layer can completely cover the first surface of the second metal part.

[0009] In one possible implementation, the edge of the first magnetic core layer extends into the gap between the second metal element and the first metal element.

[0010] In one possible implementation, the edge of the first magnetic core layer extends to the surface of the first metal member facing away from the second metal member.

[0011] In one possible implementation, the second metal component and the first metal component form a mid-frame; or, the second metal component is a battery, and the first metal component is a ribbon cable connecting the motherboard and the sub-board.

[0012] In one possible implementation, a protective layer is provided between the core layer closest to the second metal part and the second metal part; alternatively, the core layer closest to the second metal part and the second metal part are bonded together with an adhesive. One or more core layers close to the second metal part can be integrated with the second metal part, avoiding the need for an additional protective layer on the outer surface and thus additional thickness when used as a separate component.

[0013] In one possible implementation, the first magnetic core layer and the second magnetic core layer are adjacent magnetic core layers in the magnetic core, and a protective layer is disposed on the surface of the first magnetic core layer facing the second magnetic core layer.

[0014] In one possible implementation, the protective layer and the magnetic core are disposed as a single unit (that is, a protective film is disposed between the first magnetic core layer and the second magnetic core layer), and the first magnetic core layer and the protective layer are bonded together by an adhesive, as are the second magnetic core layer and the protective layer. When the protective layer is disposed as a single unit, the magnetic cores are stacked compactly and occupy a thin thickness.

[0015] In one possible implementation, the protective layer includes a first protective layer and a second protective layer spaced apart. The first magnetic core layer and the first protective layer are bonded together with an adhesive, and the second magnetic core layer and the second protective layer are bonded together with an adhesive. The magnetic core layers can be fabricated as a single unit to form a component, or they can be separated into two or more components for assembly. When fabricated as a single component, thinning can be achieved through structural integration.

[0016] In one possible implementation, the first magnetic core layer and the second magnetic core layer are adjacent magnetic core layers in the magnetic core, and the first magnetic core layer and the second magnetic core layer are bonded together by an adhesive, with an overlapping surface between them in the direction toward the first surface.

[0017] In one possible implementation, a protective layer is provided on the first magnetic core layer on a surface offset from the second magnetic core layer in the direction toward the first surface.

[0018] Secondly, this application provides a wireless charging device, including a magnetic core, a first metal component, a second metal component, and a coil, as in any possible implementation of the first aspect. Attached Figure Description

[0019] Figure 1 is a schematic diagram of a wireless charging system applicable to this application;

[0020] Figure 2 is a schematic diagram of several wireless reverse charging scenarios provided in the embodiments of this application;

[0021] Figure 3 is a schematic diagram of another wireless charging system provided in an embodiment of this application;

[0022] Figure 4 is a schematic diagram of the wireless charging principle;

[0023] Figures 5 and 6 are schematic diagrams of a module;

[0024] Figures 7 to 10 are schematic diagrams of a magnetic core layer. Detailed Implementation

[0025] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0026] It should be noted that, in the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in this article is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone.

[0027] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more, and "at least one" and "one or more" refer to one, two, or more than two. The singular expressions "a," "an," "the," "the," "the," and "this" are intended to also include expressions such as "one or more," unless the context explicitly indicates otherwise.

[0028] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0029] In the description of the embodiments of this application, the terms "upper," "lower," "left," "right," "inner," "outer," "vertical," and "horizontal," etc., indicate orientations or positional relationships relative to the indicated placement of components in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and not to indicate or imply a specific orientation that the device or component must have, or its construction and operation in a specific orientation. They can change accordingly depending on the orientation of the components in the accompanying drawings, and therefore should not be construed as limiting this application. Furthermore, "vertical" in this application is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0030] In the embodiments of this application, the same reference numerals are used to denote the same component or part. For the same part in the embodiments of this application, only one part or component may be labeled with reference numerals in the figures. It should be understood that the reference numerals also apply to other identical parts or components. In addition, the various parts in the figures are not drawn to actual scale, and the dimensions and sizes of the parts shown in the figures are only exemplary and should not be construed as limiting this application.

[0031] Figure 1 shows a schematic diagram of a wireless charging system to which this application applies.

[0032] As shown in Figure 1, the wireless charging system 100 may include a wireless charging transmitter 110 and a wireless charging receiver 120, wherein the wireless charging transmitter 110 and the wireless charging receiver 120 can transfer energy through energy coupling. More specifically, the wireless charging transmitter 110 acts as an energy source and can charge the wireless charging receiver 120 using the principle of electromagnetic induction.

[0033] In some embodiments, the wireless charging transmitter 110, which serves as a power supply device, may also be referred to as a transmitter, and the wireless charging receiver 120, which serves as a power receiving device, may also be referred to as a receiver.

[0034] In this embodiment, the wireless charging transmitter 110 or the wireless charging receiver 120 can be a smartphone, smartwatch, smart bracelet, stylus, earphone, charging case, tablet computer, e-reader, laptop computer, camera, in-vehicle device, wireless charger, portable charger (also known as power bank or mobile power supply), wearable device (such as smart glasses, smart jewelry, etc.), virtual reality (VR) terminal device, augmented reality (AR) terminal device, smart home device (such as smart screen, smart TV), or vehicle, etc., that has wireless charging function.

[0035] By way of example and not limitation, the wireless charging transmitter 110 is a charging dock and the wireless charging receiver 120 is a mobile phone; or, the wireless charging transmitter 110 is a charging case and the wireless charging receiver 120 is a wireless headset; or, the wireless charging transmitter 110 is a smartphone and the wireless charging receiver 120 is a smartwatch; or, the wireless charging transmitter 110 is a vehicle and the wireless charging receiver 120 is a portable electronic device such as a mobile phone, tablet computer, etc.

[0036] In some embodiments, the wireless charging system 100 may further include a charger 130 connected to the wireless charging transmitter 110. The charger 130 can receive AC mains power and convert it into DC power for output to the wireless charging transmitter 110, or it can directly output received AC mains power to the wireless charging transmitter 110. The wireless charging transmitter 110 converts received electrical energy into electromagnetic field energy and transmits it to the outside world. The wireless charging receiver 120 receives electromagnetic field energy and converts it into electrical energy, thereby achieving wireless charging.

[0037] In some embodiments, the wireless charging system 100 may further include an energy device 140, such as a battery, and the wireless charging transmitter 110 may be directly connected to the energy device 140 to receive DC or AC power provided by the energy device 140 as input.

[0038] In some embodiments, the wireless charging receiver 120 can also act as an energy source to charge other devices that support wireless charging. For example, a mobile phone with wireless charging capability can charge wireless charging headphones, watches, or other mobile phones. In other words, the wireless charging receiver 120 can both receive power from the wireless charging transmitter 110 and act as a wireless charging transmitter to charge other wireless charging receivers, thus supporting reverse wireless charging. Unlike the power supply of a wireless charging dock, reverse wireless charging primarily relies on the device's battery, resulting in relatively low charging power.

[0039] It should be noted that the phrase "the device has wireless charging functionality" or similar descriptions in this application can be understood as the device having the ability to wirelessly transmit power to other devices, and / or the device having the ability to wirelessly receive power transmitted from other devices. In other words, the device can be either a transmitter or a receiver.

[0040] It should be noted that the phrase "the device has wireless reverse charging function" or similar descriptions in this application can be understood as the device having the ability to receive power transmitted from other devices wirelessly and to transmit power to other devices wirelessly.

[0041] Figure 2 illustrates several wireless reverse charging scenarios provided in the embodiments of this application. It is understood that the embodiments of this application do not limit the specific form of the wireless reverse charging scenario; the wireless reverse charging scenarios shown in Figure 2 are merely examples provided for ease of understanding.

[0042] As shown in Figure 2(a), the wireless reverse charging scenario can include a mobile phone 121 and a watch 151. The mobile phone 121 can act as a receiver to receive electrical energy during the wireless charging process, or it can act as a transmitter to wirelessly reverse charge the watch 151 after the wireless reverse charging function is enabled. In this case, the watch 151 is the receiver during the wireless reverse charging process.

[0043] As shown in Figure 2(b), the wireless reverse charging scenario can include a mobile phone 122 and an earphone charging case 152. The mobile phone 122 can act as a receiver to receive electrical energy during the wireless charging process, or it can act as a transmitter to wirelessly reverse charge the earphone charging case 152 after the wireless reverse charging function is enabled. In this case, the earphone charging case 152 is the receiver during the wireless reverse charging process.

[0044] As shown in Figure 2(c), the wireless reverse charging scenario can include a first mobile phone 123 and a second mobile phone 153. The first mobile phone 123 can act as a receiver to receive electrical energy during the wireless charging process, or it can act as a transmitter to wirelessly reverse charge the second mobile phone 153 after the wireless reverse charging function is enabled. In this case, the second mobile phone 153 is the receiver during the wireless reverse charging process.

[0045] As shown in Figure 2(d), the wireless reverse charging scenario can include a tablet computer 124 and a stylus 154. The tablet computer 124 can act as a receiver to receive electrical energy during the wireless charging process, or it can act as a transmitter to wirelessly reverse charge the stylus 154 after the wireless reverse charging function is enabled. In this case, the stylus 154 is the receiver in the wireless reverse charging process.

[0046] In Figures 2(a) to (d), the watch 151, the earphone charging case 152, the second mobile phone 153, and the stylus 154 may not have wireless reverse charging function, or the wireless reverse charging function may not be enabled.

[0047] It should be understood that the embodiments of this application do not limit the specific type of device in the wireless reverse charging scenario. For example, the power supply device (i.e., the electronic device that enables wireless reverse charging and wirelessly charges other devices) can be a portable electronic device such as a mobile phone, tablet computer, or laptop computer. The power receiving device (i.e., the electronic device that is wirelessly charged by the power supply device) can be a portable electronic device such as a mobile phone, smart band, watch, earphone, keyboard, stylus, or electric toothbrush.

[0048] Additionally, it can be understood that the wireless reverse charging scenario is one type of wireless charging scenario. Accordingly, (a) to (d) in Figure 2 are actually specific examples of the wireless charging system 100, mobile phone 121, mobile phone 122, first mobile phone 123, and tablet computer 124 are specific examples of the wireless charging transmitting device 110 shown in Figure 1, and watch 151, earphone charging case 152, second mobile phone 153, and stylus 154 are specific examples of the wireless charging receiving device 120 shown in Figure 1.

[0049] Figure 3 illustrates another wireless charging system 100 provided in an embodiment of this application. The embodiment shown in Figure 3 is illustrated using an example where the wireless charging transmitter 110 is an eyeglass case and the wireless charging receiver 120 is smart glasses.

[0050] The wireless charging transmitter 110 may include a housing 111 and a magnetic core 113. The magnetic core 113 may be fixed to the housing 111, for example, fixed to the inner wall of the housing 111. The housing 111 may also be used to house eyeglasses, as shown in the wireless charging receiver 120 of FIG3.

[0051] The wireless charging receiver 120 may include a frame 128, temples 126, and lenses 125. The number of temples 126 may be one or more. In the embodiment shown in FIG3, the number of temples 126 may be multiple. The lenses 125 are fixed to the frame 128.

[0052] One end of the temple 126 is rotatably connected to one end of the frame 128 via a connecting shaft, allowing the temple 126 to switch between an unfolded and folded state. In some embodiments, one end of the temple 126 is detachably connected to one end of the frame 128 via a connecting shaft. When the temple 126 is in the unfolded state, it can be worn on the user's ear. Figure 3 is a schematic diagram of the temple 126 in the folded state. When the temple 126 is in the folded state, it is folded relative to the frame 128. In some embodiments, the folded state of the temple 126 facilitates the storage of the smart glasses in a glasses case (e.g., the wireless charging transmitter 110 shown in Figure 3, or a regular glasses case).

[0053] Electronic components (not shown in the figure), such as a motherboard, a magnetic core 127, and a battery, can be mounted on the temple 126. The motherboard may house a voice control module, a gesture recognition module, or an eye-tracking module. The battery serves as a power source, providing electrical energy to the temple 126. The magnetic core 127 may include a receiving coil, which can charge the battery. In some embodiments, the battery may be located at the end of the temple furthest from the frame, while the magnetic core 127 and the motherboard may be located at the end of the temple closer to the frame.

[0054] In some possible scenarios, smart glasses can be augmented reality (AR) smart glasses. When worn on a user's head, the user can see images presented by the smart glasses' display unit (not shown in the figure). That is, the user can not only view real-world scenes through the smart glasses, but also observe images of the virtual world. In some embodiments, the user can also enhance the observation of the real world by displaying virtual images through the smart glasses. In other possible scenarios, smart glasses are not limited to AR smart glasses; they can also be other types of smart glasses, such as VR smart glasses that achieve virtual reality (VR) effects, mixed reality (MR) smart glasses, or smart glasses with audio functions.

[0055] The principle of wireless charging from wireless charging transmitter 110 to wireless charging receiver 120 is explained below with reference to the wireless charging system 100 shown in Figures 1, 2 and 3.

[0056] During the wireless charging process from the wireless charging transmitter 110 to the wireless charging receiver 120, the wireless charging transmitter 110 and the wireless charging receiver 120 can be brought close to each other so that the transmitting coil of the wireless charging transmitter 110 can be coupled with the receiving coil of the wireless charging receiver 120.

[0057] In the embodiment shown in Figure 1, a magnetic component may be provided near the frame of the wireless charging transmitter 110. The magnetic component can be used to attach the wireless charging receiver 120 to the frame of the wireless charging transmitter 110, so that the transmitting coil of the wireless charging transmitter 110 can be stably coupled with the receiving coil of the wireless charging receiver 120.

[0058] In the embodiment shown in FIG3, the wireless charging receiver 120 can be folded and housed in the housing cavity of the wireless charging transmitter 110. The magnetic core 127 of the wireless charging receiver 120 can be disposed close to the magnetic core 113 of the wireless charging transmitter 110 so that the transmitting coil of the wireless charging transmitter 110 can be stably coupled with the receiving coil of the wireless charging receiver 120.

[0059] The magnetic core 113 can emit a changing magnetic field through a transmitting coil. The coil of the magnetic core 127 can sense the magnetic field from the magnetic core 113 and generate an induced current. The magnetic core 127 can then transmit the induced current generated by the coil to other devices within the wireless charging receiver 120, such as a battery. In this scenario, the coil of the wireless charging transmitter 110 can be a transmitting coil, and the coil of the wireless charging receiver 120 can be a receiving coil.

[0060] In some embodiments, the wireless charging transmitter 110 can also be a wireless charging receiver, meaning other devices can wirelessly charge the magnetic core 113. The coil of the magnetic core 113 can sense a magnetic field from other devices and generate an induced current. The magnetic core 113 can then transmit the induced current generated by the coil to other devices within the magnetic core 113. In this scenario, the coil of the wireless charging transmitter 110 can be a receiving coil. That is, the coil of the wireless charging transmitter 110 can act as both a transmitting coil and a receiving coil. For example, in the embodiment shown in FIG. 3, the eyeglass case can obtain power from the wireless charger through the magnetic core 113.

[0061] In other embodiments, the wireless charging receiver 120 can also be a wireless charging transmitter, meaning the magnetic core 127 can wirelessly charge other devices. The coil of the magnetic core 127 can emit a changing magnetic field, enabling the wireless charging receiver 120 to wirelessly charge other devices. In this scenario, the coil of the wireless charging receiver 120 can be a transmitting coil. That is, the coil of the wireless charging receiver 120 can act as both a receiving coil and a transmitting coil. For example, in the embodiment shown in FIG. 2, a stylus can wirelessly charge other devices via the magnetic core. As another example, in the embodiment shown in FIG. 3, smart glasses can wirelessly charge other devices via the magnetic core 127.

[0062] In some embodiments provided in this application, the coil may be a loop winding made of tightly wound wire. The wire may be wrapped with insulating material.

[0063] Figure 4 shows a schematic diagram of the wireless charging principle. As shown in Figure 4, the wireless charging scenario involves a transmitter 210 (i.e., a power supply device) and a receiver 220 (i.e., a power receiving device). Both the transmitter 210 and the receiver 220 have wireless charging capabilities to enable the wireless charging process from the transmitter 210 to the receiver 220.

[0064] The transmitter 210 may include a first coil 211, a first chip 212, and a power supply 213, while the receiver 220 may include a second coil 221, a second chip 222, and a load 223. The first coil 211 and the second coil 221 are used to achieve energy coupling. The first chip 212 and the second chip 222 are used to implement wireless charging control or management. The power supply 213 and the load 223 are used to store electrical energy.

[0065] After the wireless charging area of ​​the transmitter 210 is aligned with the wireless charging area of ​​the receiver 220, the transmitter 210 can wirelessly charge the receiver 220. Specifically, during the wireless charging process, the transmitter 210 can control the power supply 213 to output current to the first coil 211 (i.e., the power output coil) through the first chip 212, so that the first coil 211 can emit a high-frequency magnetic field, that is, convert the electrical signal into a magnetic signal. This high-frequency magnetic field can pass through the second coil 221 (i.e., the power receiving coil), so that an induced current is generated in the second coil 221, that is, convert the magnetic signal into an electrical signal. The second chip 222 can detect the induced current and input the induced current to the load 223.

[0066] In some embodiments, the first chip 212 may include a transformer module and a transmitting circuit, wherein the transformer module is used to perform voltage conversion, and the transmitting circuit is used to convert direct current into alternating current signals. Accordingly, the first coil 211 is used to convert the alternating current signals into magnetic signals and transmit them.

[0067] In some embodiments, the second chip 222 may include a transformer module and a receiving circuit. The second coil 221 is used to convert the magnetic signal into an alternating current signal, the receiving circuit is used to convert the alternating current signal into a direct current signal, and the transformer module is used to perform voltage conversion.

[0068] Wireless charging is now widely used, providing users with a more convenient charging experience. Compared to wired charging, the coil module required for wireless charging adds thickness to the device. To achieve a thin and light design, existing devices generally use nanocrystalline magnetic cores with high saturation magnetic flux density for coupling enhancement and magnetic field shielding.

[0069] In existing architectures, eddy currents on metal components (such as coils and batteries) can be reduced during wireless charging using magnetic cores, but this takes up a lot of space.

[0070] To address the aforementioned problems, referring to Figure 5, an embodiment of this application provides a magnetic core, comprising:

[0071] The first magnetic core layer and the second magnetic core layer; wherein, the magnetic core can be a structure composed of multiple magnetic core layers, for example, the magnetic core can be a nanocrystalline magnetic core, or a magnetic core of other materials in a stacked or layered structure, and the embodiments of this application are not limited thereto.

[0072] The magnetic core and the first metal part are located on the same side of the first surface of the second metal part; the second metal part can be a plate-shaped structure, and the first surface can be the largest plate surface of the second metal part, such as a battery or the middle frame of a terminal device. The first metal part can be the ribbon cable of the terminal device (for example, the ribbon cable connecting the motherboard and the sub-board of the terminal device). The magnetic core is disposed between the coil and the metal part (that is, the coil is disposed on the side of the magnetic core facing away from the second metal part), which can reduce the eddy currents on the metal part during wireless charging.

[0073] In existing technologies, to minimize eddy currents on the metal components, each core layer in the magnetic core completely covers the second metal component or simultaneously covers both the first and second metal components. This results in a relatively large module thickness (the sum of the thickness of the first metal component, the thickness of the magnetic core, and the thickness of the second metal component) in the direction towards the first surface. In this embodiment, to reduce eddy currents on the second metal component during wireless charging, a portion of the magnetic core layer (the first magnetic core layer) in the magnetic core can overlap with the first metal component in the direction towards the first surface. To reduce the module thickness, a portion of the magnetic core layer (the second magnetic core layer) in the magnetic core can be completely offset from the first metal component in the direction towards the first surface. This results in a smaller module thickness in the direction towards the first surface (the sum of the thickness of the first metal component, the thickness of the overlapping magnetic core layer in the direction towards the first surface, and the thickness of the second metal component). This reduces the overall structural thickness while ensuring reduced eddy currents on the metal components.

[0074] In this process, multiple magnetic core layers, including the first magnetic core layer, can overlap with the first metal component in the direction toward the first surface.

[0075] Optionally, in order to improve the reduction effect of eddy currents on the first metal part, the first magnetic core layer can completely cover the first surface of the second metal part.

[0076] In one possible implementation, the edge of the first magnetic core layer extends into the gap between the second metal element and the first metal element.

[0077] As shown in Figure 5, taking the second metal component as the battery and the first metal component as the ribbon cable as an example, on the left side of Figure 5, all the magnetic core layers of the magnetic core are completely offset from the first metal component in the direction towards the first surface. The lower side of Figure 5 shows a schematic diagram of the direction towards the first surface of the first metal component. In this case, the magnetic core and the first metal component are completely offset in the direction towards the first surface. For mobile phone architectures where the wireless charging coil module and the main / sub-board connection ribbon cable are located on the same layer, one or more layers of the multi-layer magnetic core closer to the battery can be extended to cover the battery as completely as possible. The edge 502 of the magnetic core layer away from the battery does not extend to the position of the first metal component, thereby reducing eddy currents on the coil battery during wireless charging and avoiding significant encroachment on the space of the connection ribbon cable. The upper right side of Figure 5 shows a schematic diagram of only one magnetic core layer 501 extending to the gap between the first and second metal components. The lower right side of Figure 5 shows a schematic diagram of two magnetic core layers 501 extending to the gap between the first and second metal components.

[0078] In one possible implementation, the edge of the first magnetic core layer extends to the surface of the first metal member facing away from the second metal member.

[0079] As shown in Figure 6, taking the first metal component as the battery and the second metal component as the ribbon cable as an example, for ribbon cables with significant eddy current losses, one or more layers of the multilayer nanocrystalline magnetic core, located away from the battery, can be extended to cover both the battery and the ribbon cable as completely as possible. The top of Figure 6 shows a schematic of only one magnetic core layer extending to the back of the second metal component, while the bottom of Figure 6 shows a schematic of two magnetic core layers extending to the back of the second metal component.

[0080] In one possible implementation, a protective layer is provided between the core layer closest to the second metal member and the second metal member.

[0081] As shown in Figure 7, a multilayer magnetic core stack structure according to an embodiment of this application is provided. In Figure 7, a protective layer is disposed between the magnetic core layer closest to the second metal component and the second metal component.

[0082] In one possible implementation, the core layer closest to the second metal part is bonded to the second metal part using an adhesive. As shown in Figure 8, one or more core layers close to the second metal part can be integrated with the second metal part, avoiding the need for an additional protective layer on the outer surface and thus additional thickness when used as a separate component.

[0083] In one possible implementation, the first magnetic core layer and the second magnetic core layer are adjacent magnetic core layers in the magnetic core, and a protective layer is disposed on the surface of the first magnetic core layer facing the second magnetic core layer.

[0084] In one possible implementation, the protective layer and the magnetic core are configured as a single unit (that is, a protective film is disposed between the first magnetic core layer and the second magnetic core layer), and the first magnetic core layer and the protective layer are bonded together by an adhesive, as are the second magnetic core layer and the protective layer. See Figure 7 for details.

[0085] In one possible implementation, the protective layer includes a first protective layer and a second protective layer spaced apart. The first magnetic core layer and the first protective layer are bonded together with an adhesive, and the second magnetic core layer and the second protective layer are bonded together with an adhesive. The magnetic core layers can be fabricated as a single unit to form a component, or they can be separated into two or more components for assembly. When fabricated as a single component, thinning can be achieved through structural integration. As shown in Figure 9, one or more magnetic core layers that need to be expanded can be independently separated for easier fabrication. When the protective layer is a single unit, the magnetic cores are compactly stacked and occupy a thin layer; when separated into two or more components, the fabrication difficulty is low.

[0086] In one possible implementation, the first magnetic core layer and the second magnetic core layer are adjacent magnetic core layers in the magnetic core, and the first magnetic core layer and the second magnetic core layer are bonded together by an adhesive, with an overlapping surface between them in the direction toward the first surface.

[0087] In one possible implementation, a protective layer is provided on the first magnetic core layer on a surface offset from the second magnetic core layer in the direction toward the first surface.

[0088] As shown in Figure 10, parts other than the adhesive between the magnetic cores can be removed to achieve a thin and light design with a thin overall thickness.

[0089] The magnetic core provided in this application embodiment can be applied to charging equipment, vehicles, or portable electronic devices as a receiver or transmitter of electrical energy.

[0090] Taking vehicles as an example, with the widespread use of cars, automobiles have become an indispensable means of transportation in people's daily lives. However, vehicle development cycles are long and updates are slow, making it difficult to meet the diverse and personalized needs of consumers. Consumer electronics products such as mobile phones and watches are convenient for consumers to carry around, and their advantages of short lifecycles and rapid updates allow them to adapt to rapidly changing scenarios. Therefore, the integration of the consumer electronics industry and the automotive industry is imperative. In this embodiment, the charging device containing the magnetic core mentioned above can be applied to vehicles, which is conducive to promoting the practice of integrating consumer electronics products into vehicles.

[0091] In some embodiments, the charging device containing the magnetic core provided in this application can be installed in at least one of the following locations: the vehicle's dashboard, seat back, door armrest, center armrest, door trim panel, and trunk. This allows users to conveniently charge in-vehicle devices using the charging device containing the magnetic core. In this application embodiment, when the charging device containing the magnetic core is installed in the vehicle, it can be electrically connected to the vehicle's power supply circuit, and the energy source for the charging device is the vehicle. In other words, the charging device containing the magnetic core obtains energy from the vehicle's power supply circuit and can wirelessly charge other devices.

[0092] In some embodiments, the charging device containing the magnetic core provided in this application can be fixedly installed in the vehicle as a pre-installed component. That is, the charging device containing the magnetic core is built into the vehicle as a pre-installed accessory before the vehicle leaves the factory. In this way, the vehicle can charge the on-board ecological devices without the need for exposed wires or charging interfaces, which can improve the aesthetics and help meet the personalized and diverse needs of users.

[0093] In other embodiments, the charging device containing the magnetic core provided in this application is installed in the vehicle via a detachable connection structure. For example, the charging device containing the magnetic core is installed in the vehicle using clamps, clips, threads, hook and loop fasteners, etc. This allows users to conveniently use the charging device containing the magnetic core to charge in-vehicle devices from different locations within the vehicle. In some embodiments, the charging device containing the magnetic core can be electrically connected to the charging interface on the vehicle via a charging connector or via contacts.

[0094] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A magnetic core, characterized in that, include: First magnetic core layer and second magnetic core layer; wherein... The magnetic core and the first metal component are located on the same side of the first surface of the second metal component; The first magnetic core layer and the first metal component overlap in the direction toward the first surface; The second magnetic core layer and the first metal component are completely offset in the direction toward the first surface; A coil is provided on the side of the magnetic core facing away from the second metal part.

2. The magnetic core according to claim 1, characterized in that, The edge of the first magnetic core layer extends into the gap between the second metal element and the first metal element.

3. The magnetic core according to claim 1, characterized in that, The edge of the first magnetic core layer extends to the surface of the first metal part facing away from the second metal part.

4. The magnetic core according to any one of claims 1 to 3, characterized in that, The second metal component and the first metal component together form a mid-frame; or, the second metal component is a battery and the first metal component is a ribbon cable connecting the main board and the sub-board.

5. The magnetic core according to any one of claims 1 to 4, characterized in that, A protective layer is provided between the magnetic core layer closest to the second metal part and the second metal part; or, the magnetic core layer closest to the second metal part and the second metal part are bonded together by an adhesive.

6. The magnetic core according to any one of claims 1 to 5, characterized in that, The first magnetic core layer and the second magnetic core layer are adjacent magnetic core layers in the magnetic core, and a protective layer is provided on the surface of the first magnetic core layer facing the second magnetic core layer.

7. The magnetic core according to claim 6, characterized in that, The protective layer and the magnetic core are configured as a whole. The first magnetic core layer and the protective layer are bonded together by an adhesive, and the second magnetic core layer and the protective layer are bonded together by an adhesive.

8. The magnetic core according to claim 6, characterized in that, The protective layer includes a first protective layer and a second protective layer with a gap between them. The first magnetic core layer and the first protective layer are bonded together by an adhesive, and the second magnetic core layer and the second protective layer are bonded together by an adhesive.

9. The magnetic core according to any one of claims 1 to 5, characterized in that, The first magnetic core layer and the second magnetic core layer are adjacent magnetic core layers in the magnetic core. The first magnetic core layer and the second magnetic core layer have overlapping surfaces in the direction towards the first surface and are bonded together by an adhesive.

10. The magnetic core according to claim 9, characterized in that, A protective layer is provided on the first magnetic core layer on a surface offset from the second magnetic core layer in the direction facing the first surface.

11. A wireless charging device, characterized in that, It includes the magnetic core, the first metal component, the second metal component, and the coil as described in any one of claims 1 to 10.

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