Wireless charging system

Abstract

This utility model discloses a wireless charging system with a magnetic core structure. The magnetic core structure is respectively disposed at the transmitting end and the receiving end. The magnetic core structure includes: a first magnetic core and a second magnetic core connected together; there is a height difference and / or spacing between the first magnetic core and the second magnetic core, such that after the coil is wound around the magnetic core structure, the first magnetic core and the second magnetic core generate magnetic fields in opposite directions; in the working state: the first magnetic core located at the transmitting end is opposite to the second magnetic core located at the receiving end, and the two have different working areas; the second magnetic core located at the transmitting end is opposite to the first magnetic core located at the receiving end, and the two have different working areas. Based on the magnetic core structure and wireless charging system of this application, it can provide high anti-misalignment for wireless charging, reduce the "alignment" requirements of the transmitting end and the receiving end, and improve working efficiency and charging convenience.

Description

Technical Field

[0001] This utility model relates to the field of wireless charging, and more particularly to a wireless charging system. Background Technology

[0002] With the development of electric vehicles, charging solutions have also become more diverse. In addition to the common wired charging solution, wireless charging is becoming increasingly prevalent. During wireless charging, the transmitter and receiver need to be aligned as closely as possible to achieve the maximum coupling coefficient; any misalignment will significantly reduce the efficiency of wireless charging.

[0003] In the existing technology, a variety of automatic alignment schemes have been proposed, but few studies have been conducted on how to improve the resistance to offset. Utility Model Content

[0004] A wireless charging system includes a magnetic core structure disposed at a transmitter and a receiver. The magnetic core structure comprises a first magnetic core and a second magnetic core connected together. A height difference and / or spacing exists between the first and second magnetic cores, such that after a coil is wound around the magnetic core structure, the first and second magnetic cores generate magnetic fields in opposite directions. In the operating state: the first magnetic core at the transmitter is opposite to the second magnetic core at the receiver, and the two have different working areas; the second magnetic core at the transmitter is opposite to the first magnetic core at the receiver, and the two have different working areas.

[0005] Preferably, the first magnetic core and the second magnetic core are in direct contact and connected; the first magnetic core and the second magnetic core are an integral part; or they are separate parts.

[0006] Preferably, the first magnetic core and the second magnetic core are connected through a third magnetic core; the first magnetic core, the second magnetic core and the third magnetic core are a single piece; or two of them are a single piece; or all of them are separate pieces.

[0007] Preferably, the coil is wound on either the first magnetic core or the second magnetic core; or, the coil is wound on the contact portion of the first magnetic core and the second magnetic core, and on either the first magnetic core or the second magnetic core.

[0008] Preferably, the coil is wound on any one of the first magnetic core, the second magnetic core, and the third magnetic core; or, the coil is wound on the third magnetic core and on any one of the first magnetic core and the second magnetic core.

[0009] Preferably, the portion where the coil is wound has a groove.

[0010] Preferably, the first magnetic core is a single integral structure or is composed of multiple spaced individual magnetic cores; the second magnetic core is a single integral structure or is composed of multiple spaced individual magnetic cores.

[0011] Preferably, when in operation, there is an air gap between the first magnetic core located at the transmitting end and the second magnetic core located at the receiving end; there is also an air gap between the second magnetic core located at the transmitting end and the first magnetic core located at the receiving end.

[0012] Based on the magnetic core structure and wireless charging system of this application, high anti-misalignment can be provided for wireless charging, reducing the "alignment" requirements of the transmitter and receiver, and improving working efficiency and charging convenience. Attached Figure Description

[0013] Figures 1A-1D This is a schematic diagram of the four magnetic core structures in this application.

[0014] Figure 2 To and Figure 1A A 3D diagram of the corresponding magnetic core structure.

[0015] Figure 3 for Figure 2 A schematic diagram of the working status.

[0016] Figure 4 To and Figure 1B A 3D diagram of the corresponding magnetic core structure.

[0017] Figure 5 for Figure 4 A schematic diagram of the working status.

[0018] Figure 6 for Figure 5 A three-dimensional schematic diagram.

[0019] Figure 7 For the corresponding Figure 1D A schematic diagram of the working status.

[0020] Figure 8 and Figure 9 This is a schematic diagram of the groove.

[0021] Figure 10 This is a schematic diagram of the magnetic field direction when the present invention is in operation.

[0022] Figure 11 and Figure 12 A schematic diagram showing the configuration of the first and second magnetic cores.

[0023] Figure 13 This is a schematic diagram of the block structure of the magnetic core.

[0024] Figure 14 This is a schematic diagram of the first working state.

[0025] Figure 15 This is a schematic diagram of the second working state. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] This utility model discloses a wireless charging system, which consists of a transmitter and a receiver, each equipped with a magnetic core structure. The magnetic core structures are described in detail below. The magnetic core structures used at both ends can be identical or differ slightly, such as in size, but they share the same fundamental principle. Details are as follows.

[0028] The magnetic core structure includes a first magnetic core 1 and a second magnetic core 2. The first magnetic core 1 and the second magnetic core 2 have a height difference and / or a spacing. Figure 1A and Figure 1B The first magnetic core 1 and the second magnetic core 2 shown have a height difference, wherein Figure 1B The first magnetic core 1 is a ring-shaped protrusion. Figure 1C There is a gap between the first magnetic core 1 and the second magnetic core 2. Figure 1D There is both a height difference and a spacing between the first magnetic core 1 and the second magnetic core 2. The first magnetic core 1 and the second magnetic core 2 also have different working areas.

[0029] This magnetic core structure is used for wireless charging. A coil is wound around it, with at least two turns (the winding can be either axial or radial, forming a cylindrical coil and a planar coil. In some embodiments, it can be wound in both directions simultaneously). After the coil is wound, in operation, the first magnetic core 1 and the second magnetic core 2 actively or generate magnetic fields in opposite directions. The phrase "generating magnetic fields in opposite directions" can refer to an "actively generated magnetic field" after the transmitter is energized, or a "passively generated magnetic field" through electromagnetic induction at the receiver.

[0030] The "opposite direction" mentioned in this application can be determined from the entry and exit of the magnetic field, such as... Figure 10 As shown, at the transmitting end, the magnetic field is emitted from the surface of the first magnetic core 1, passes through the receiving end magnetic core structure, and enters from the surface of the second magnetic core 2 at the transmitting end. Here, "one in and one out" refers to the magnetic fields with opposite directions. Similarly, at the receiving end, the magnetic field enters from the surface of the second magnetic core 2 at the receiving end and is emitted from the first magnetic surface at the receiving end, which is also "one in and one out".

[0031] It's important to understand that the direction mentioned here refers to a specific instantaneous direction. When using alternating current, the direction of the magnetic field changes, but the "in and out" relationship remains. Figure 10 Correspondingly, at this moment, the magnetic field at the transmitting end may enter from the surface of the first magnetic core 1 and be emitted from the surface of the second magnetic core 2 at the transmitting end. At the receiving end, the magnetic field is emitted from the surface of the second magnetic core 2 at the receiving end and enters from the first magnetic surface at the receiving end. This is also a case of "one in and one out".

[0032] Regardless of the direction of the alternating current, in the same magnetic core structure, the first magnetic core 1 and the second magnetic core 2 maintain a magnetic field with "one in and one out", that is, magnetic fields with opposite directions.

[0033] In the working state: the first magnetic core 1 at the transmitting end and the second magnetic core 2 at the receiving end are opposite each other. Because the first magnetic core 1 and the second magnetic core 2 have different working areas, they are located at different ends and have different working areas. The second magnetic core 2 at the transmitting end and the first magnetic core 1 at the receiving end are opposite each other, and they have different working areas. In the above state, there is a gap between the first magnetic core 1 at the transmitting end and the second magnetic core 2 at the receiving end; there is a gap between the second magnetic core 2 at the transmitting end and the first magnetic core at the receiving end.

[0034] The different working areas mentioned above are to ensure a larger range of deviation during operation. For example... Figures 1A-1D As shown, the first magnetic core 1 and the second magnetic core 2 have different working areas. Therefore, when applied to the transmitting and receiving ends, as... Figure 3 , Figure 5 , Figure 7 This will naturally result in different working areas.

[0035] The aforementioned working area refers to the area within which the magnetic cores of the receiver and transmitter can achieve wireless charging when facing each other. Generally, a smaller working area within a larger working area provides better wireless charging efficiency. This setup, in the event of misalignment, allows the larger working area to provide a wider range for the smaller working area to choose from, thus offering better tolerance for misalignment.

[0036] It's important to understand that even if both ends use the exact same working area, wireless charging is still possible, only the offset range will be smaller. For Figure 1B , Figure 4 , Figure 5The transmitter and receiver shown have slightly different structures. The transmitter has a first magnetic core 1 with an annular protrusion, and the receiver has a first magnetic core 1 with a cylindrical protrusion. In this case, the annular area of ​​the annular protrusion is the working area of ​​the first magnetic core 1 of the transmitter, and the area of ​​the region surrounded by the annular protrusion is the working area of ​​the second magnetic core 2 of the transmitter. In the receiver, the area of ​​the cylindrical protrusion is the working area of ​​the first magnetic core 1 of the receiver, and the working area of ​​the second magnetic core 2 of the receiver is the area excluding the cylindrical protrusion.

[0037] For ease of understanding, the working area can be understood as its orthographic projection.

[0038] The following explains the impact of the working area on wireless charging efficiency, combined with... Figure 14 and Figure 15 In the diagram, the lower part is defined as the transmitter and the upper part as the receiver.

[0039] Furthermore, when in operation, the relative position of the working area affects the efficiency of wireless charging. See also Figure 14 Its corresponding Figure 5 and Figure 6 In this manner, the working area of ​​the first magnetic core 1 at the transmitting end is marked as S. t小 The working area of ​​the second magnetic core 2 at the transmitting end is marked as S. t大 The working area of ​​the first magnetic core 1 at the receiving end is marked as S. r小 The working area of ​​the second magnetic core 2 at the receiving end is marked as S. r大 .exist Figure 14 As shown, the working area S of the first magnetic core 1 at the transmitting end is... t小 The working area S of the second magnetic core 2 (with a smaller working area) is entirely located at the receiving end. r大 (i.e., the first magnetic core 1 located at the transmitting end and the second magnetic core 2 located at the receiving end are opposite each other, and the smaller working area is completely within the area range of the larger working area).

[0040] Meanwhile, the working area S of the first magnetic core 1 at the junction r小 The working area S of the second magnetic core 2, which is located entirely at the transmitting end, is a smaller working area. t大 (i.e., the second magnetic core 2 located at the transmitting end is opposite to the first magnetic core 1 located at the receiving end, and the smaller working area is completely within the area range of the larger working area).

[0041] This working state is called the first working state. In this state, the smaller working area is completely within the larger working area, with less offset change, resulting in better wireless charging efficiency. It can also be called the optimal working state.

[0042] See also Figure 15Then, it becomes the second working state, which enables wireless charging, but the efficiency is lower than that of the first working state.

[0043] In the second operating state: the operating area S of the first magnetic core 1 at the transmitting end t小 (Smaller working area) and the working area S of the second magnetic core 2 at the receiving end r大 (The larger working area) partially overlaps (i.e., the first magnetic core 1 located at the transmitting end is opposite to the second magnetic core 2 located at the receiving end, and the smaller working area partially overlaps with the larger working area).

[0044] Meanwhile, the working area S of the second magnetic core 2 at the transmitting end t大 (Larger working area) and the working area S of the first magnetic core 1 at the receiving end r小 (Smaller working area) partially overlaps (i.e., the second magnetic core 2 located at the transmitting end is opposite to the first magnetic core 1 located at the receiving end, and the smaller working area partially overlaps with the larger working area).

[0045] It is understandable that the overlapping working area in the second working state is smaller than that in the first working state, and its wireless charging efficiency is lower than that in the first working state. The aforementioned overlap refers to the overlap on a projected plane. Because there is an air gap between the transmitter and receiver, there is no actual overlap in three-dimensional space, meaning that the magnetic core structure of the transmitter and the magnetic core structure of the receiver will not be in direct contact.

[0046] based on Figure 1B , Figure 5 and Figure 6 In this scheme, because it includes a first magnetic core 1 that is annular at one end and a first magnetic core 1 that is cylindrical at the other end, the first working state can be achieved as long as the position is determined.

[0047] The first and second working states described above both enable wireless charging; other alignment schemes are defined as malfunctioning states. For example, the first magnetic field 1 of the transmitter and the first magnetic field 1 of the receiver will not be aligned, nor will their working areas overlap. Similarly, the second magnetic field 2 of the transmitter and the second magnetic field 2 of the receiver will not be aligned, nor will their working areas overlap.

[0048] In this application, regardless of the specific shape, material, or size of the first magnetic core 1 and the second magnetic core 2, or the winding method, number of turns, or material of the coil, as long as it can satisfy the requirement that the first magnetic core 1 and the second magnetic core 2 generate magnetic fields in opposite directions, it is applicable to this application.

[0049] like Figure 1A and Figure 1B As shown, the first magnetic core 1 and the second magnetic core 2 are in direct contact and connected; they can be a single piece or separate parts, for example, combined by bonding, welding or other means.

[0050] like Figure 1C and Figure 1D As shown, the first magnetic core 1 and the second magnetic core 2 can also be connected through the third magnetic core 3. These three magnetic cores can be a single piece, or all three can be separate pieces, or two of them can be a single piece and the other can be a separate piece.

[0051] During coil winding, the coil is wound on either the first magnetic core 1 or the second magnetic core 2; alternatively, the coil is wound on the contact portion of the first magnetic core 1 and the second magnetic core 2, or on either the first magnetic core 1 or the second magnetic core 2. This winding method is applicable to... Figure 1A and Figure 1B The direct connection method shown.

[0052] for Figures 1C to 1D The connection shown via the third magnetic core 3 can be wound on any one of the first magnetic core 1, the second magnetic core 2, and the third magnetic core 3, or wound on the third magnetic core 2, and on any one of the first magnetic core 1 and the second magnetic core 2.

[0053] For all the above-mentioned methods of winding coils, a groove 4 can be formed at the location where the coil is wound. The specific form of the groove 4 is not limited, and its specific location can be in the first magnetic core 1, the second magnetic core 2, and the third magnetic core 3. The first magnetic core 1 and the second magnetic core 2 can both be integral structures, or they can be composed of multiple spaced individual magnetic cores.

[0054] When in operation, there is an air gap between the first magnetic core 1 of the transmitting end magnetic core structure and the second magnetic core 2 of the receiving end magnetic core structure; there is also an air gap between the second magnetic core 2 of the transmitting end magnetic core structure and the first magnetic core 1 of the receiving end magnetic core structure.

[0055] See Figure 2 and Figure 3 , Figure 2 Is and Figure 1A The corresponding structure shown is Figure 3 This is a schematic diagram of its working state.

[0056] The first magnetic core 1 is convex, while the second magnetic core 2 has a flat front surface. The second magnetic core 2 is relatively flat compared to the first magnetic core 1, but this does not necessarily mean it is perfectly horizontal. In the working state, i.e., during wireless charging, the transmitter and receiver need to be close together. The second magnetic cores 2 of the magnetic core structure at the receiver and the magnetic core structure at the transmitter are opposite each other, with the first magnetic core 1 at both ends positioned between the two second magnetic cores 2. During the process of the transmitter and receiver moving closer, the first magnetic core 1 at one end will touch the second magnetic core 2 at the other end. Furthermore, the top surfaces of the first magnetic cores 1 at both ends do not touch, indicating that the first magnetic cores 1 at both ends do not obstruct the movement of the two ends.

[0057] The distance between the two ends is measured by the air gap. The air gap is the distance between the top surface of the first magnetic core 1 at one end and the second magnetic core 2 at the other end when the two ends are close together. The preferred distance is 0mm-100mm, which means that the two can be close together or far apart.

[0058] The proximity of the transmitter and receiver mentioned here could mean either the transmitter has a moving mechanism to raise its height and bring the two closer, or the receiver has a moving mechanism to lower its height and bring the two closer. These two methods are generally used in high-power wireless charging scenarios, such as charging electric vehicles. Alternatively, neither the transmitter nor receiver could use a moving mechanism; instead, the receiver would be manually moved close to the transmitter, as in scenarios like wirelessly charging mobile phones.

[0059] Regardless of the scenario, it is necessary to ensure that the first magnetic core 1 at both ends is not directly opposite each other, that is, the top surfaces of the first magnetic core 1 at both ends do not touch.

[0060] In this scheme, the transmitter and receiver are no longer limited by the "alignment" constraint of existing technologies. It is sufficient to ensure that the first magnetic core 1 at one end is close to the second magnetic core 2 at the other end; the specific location of the second magnetic core 2, or the distance between the two first magnetic cores 1, is not specifically limited. This structure has a high tolerance for offset, ensuring high magnetic flux regardless of the specific location. In this case, the first magnetic core 1 being formed at the edge of the second magnetic core 2 provides more offset space. The specific impact of the offset on the coupling coefficient will be explained below.

[0061] See Figure 4 , Figure 5 and Figure 6 , Figure 4 correspond Figure 1B A schematic diagram, Figure 5 and Figure 6 This is its working state, in which it is... Figure 1B The magnetic core structure shown and Figure 1A The combination of magnetic core structures shown.

[0062] In the magnetic core structure located at the receiving end and the magnetic core structure located at the transmitting end, the first magnetic core 1 of one of them is ring-shaped (e.g., Figure 1B and Figure 4 As shown in the figure, the annular area is larger than the area of ​​the other first magnetic core 1, and the annular first magnetic core 1 surrounds the other first magnetic core 1. This embodiment is more suitable for scenarios of charging electric vehicles. Generally, the first magnetic core 1 of the transmitter located on the ground is annular, and the first magnetic core 1 of the receiver located in the vehicle is surrounded by the first magnetic core 1 of the transmitter located on the ground.

[0063] The magnetic core structure at the receiving end is the same as that at the transmitting end, and of course, the height of the first magnetic core 1 is the same.

[0064] See Figure 7 ,for Figure 1D The working state of the magnetic core structure shown is as follows: the first magnetic core 1 and the second magnetic core 2 are both surface structures, which can be horizontal or non-horizontal. Their surfaces can be uneven or tilted, as will be explained in detail below.

[0065] In some embodiments, a housing, typically made of aluminum, is also provided outside the magnetic core structure. The housings of the two magnetic core structures may be in contact.

[0066] The following specific embodiments illustrate the effect of offset on coupling coefficient. The size parameters, distance parameters, etc., mentioned in the following embodiments are for better illustrating the content of this application and are not intended to limit this application.

[0067] Example 1

[0068] In this embodiment, see Figure 2 and Figure 3 The second magnetic core 2 of the magnetic core structure has a length of 180mm, a width of 120mm, and a thickness of 3mm. The first magnetic core 1 has a radius of 20mm and a height of 3mm. The first magnetic core 1 is located in the central region in the width direction and in the avoidance center region in the length direction. In this embodiment, the coils are all formed on the outer wall surface of the first magnetic core 1.

[0069] When in operation, the magnetic core structure of the transmitting end and the magnetic core structure of the receiving end are opposite each other, with the alignment of the four sides of the second magnetic core 2 as a reference. At this time, the distance between the two first magnetic cores 1 is taken as the reference distance, and the offset F is considered to be 0.

[0070] Referring to Table 1 below, the effect of offset on the vehicle-end self-inductance, mutual inductance, and ground-end self-inductance at a frequency of 85.5 kHz is shown. Here, offset refers to simultaneous movement in the X and Y directions, where the X direction is the length direction of the second magnetic core 2 and the Y direction is the width direction of the second magnetic core 2.

[0071] Table 1

[0072]

[0073] As shown in Table 1, an offset of 5mm means a movement of 5mm in both the X and Y directions. The rate of change for each 5mm offset is the parameter change compared to the previous 5mm offset. For example, with an offset of -25mm, the vehicle end self-inductance is 9.420389906, and with an offset of -30mm, the vehicle end self-inductance is 9.394948933. The rate of change in vehicle end self-inductance due to this 5mm offset is -0.27%. The offset relative to the positive direction rate of change refers to the parameter change rate of each row's offset relative to the offset of 0 (positive direction).

[0074] As can be seen from Table 1 above, compared with the direct counterpart, the self-inductance change rate of each offset is within 2%, and the mutual inductance change rate is within 3.5%, indicating a good anti-offset effect.

[0075] Example 2

[0076] In this embodiment, see Figures 4 to 6 One end of the first magnetic core 1 is ring-shaped (it can be a closed ring or a discontinuous ring; see below for details), and during wireless charging, it surrounds the other end of the first magnetic core 1. For ease of description, combined with... Figure 5 and Figure 6 The protruding magnetic core of the transmitting end is set as a ring, formed on the edge of the second magnetic core 2, and the first magnetic core 1 of the receiving end can extend into the ring-shaped first magnetic core 1; the first magnetic core 1 of the receiving end is preferably located at the center of the second magnetic core 2 of the receiving end. In this embodiment, the planar magnetic core is a square with a side length of 200mm and a thickness of 3mm. The outer diameter of the first magnetic core 1 of the transmitting end is 76.6mm and the height is 3mm. In this embodiment, as... Figure 3 The inner wall surface of the annular first magnetic core 1 shown is provided with a coil, while the outer wall surface of the other end of the first magnetic core 1 is provided with a coil.

[0077] Figure 6 In this diagram, the first magnetic core 1 of the transmitting end is made transparent to show the coil. The first magnetic core 1 of the receiving end is located inside its coil and is therefore not shown directly.

[0078] In operation, the magnetic core structures of the transmitting and receiving ends are positioned relative to each other, with the alignment of the four sides of the second magnetic core 2 serving as a reference. The first magnetic core 1 of the receiving end is located at the center of the first magnetic core 1 of the transmitting end. At this point, the distance between the two first magnetic cores 1 is taken as the reference distance, and the position of the first magnetic core 1 of the receiving end is taken as the base position. The offset F is considered to be 0. In this structure, because the first magnetic core 1 of the transmitting end is ring-shaped, the offset F no longer needs to define XY axes; it can directly represent the offset from the base position. It can also be understood as the displacement distance of the first magnetic core 1 of the receiving end relative to the base position.

[0079] The receiving end's first magnetic core 1 extends into the annular space of the transmitting end's first magnetic core 1. The distance of this extension affects mutual inductance, and generally, the greater the extension, the better the mutual inductance. For better quantification, we use the distance between the receiving end's first magnetic core 1 and the transmitting end's second magnetic core 2 as a standard to measure the extension amount, which is called the air gap. In other words, the smaller the air gap, the greater the extension amount, and the better the mutual inductance.

[0080] Table 2 below also shows the effect of offset on vehicle-end self-inductance, mutual inductance, and ground-end self-inductance at a frequency of 85.5 kHz and an air gap of 4 mm.

[0081] Table 2

[0082]

[0083] Table 3 below shows the effect of offset on vehicle-end self-inductance, mutual inductance, and ground-end self-inductance at a frequency of 85.5 kHz and an air gap of 10 mm.

[0084] Table 3

[0085]

[0086] As can be seen from Tables 2 and 3, the data for a 4mm air gap are better than those for a 10mm air gap. This means that the smaller the air gap, the greater the insertion amount and the better the mutual inductance. Tables 2 and 3 alone show that, compared to the direct pair, the self-inductance and mutual inductance change rates are all within 1.6%, indicating a good anti-offset effect.

[0087] As can be seen from Tables 1 to 3, the solution in Example 2 is significantly better than that in Example 1.

[0088] It should be understood that the size data and frequency data of the above two embodiments are only examples and are not intended to limit this application. In embodiment 2, the transmitter uses a ring-shaped first magnetic core 1 that surrounds the receiver's first magnetic core 1, which is also an example. In actual use, the receiver can also use a ring-shaped first magnetic core 1 that surrounds the transmitter's first magnetic core 1.

[0089] The two embodiments described above also share the following common features.

[0090] 1. At the junction of the first magnetic core 1 and the second magnetic core 2, or at the junction of them with the third magnetic core 3, a groove 4 for winding is formed. See also Figure 5 , Figure 8 and Figure 9 The purpose of this groove 4 is to provide more space for winding; its specific shape is not limited, such as... Figure 8 The groove has a square cross-section. Figure 9 It is then arc-shaped. The groove 4 is not limited to being located on the first magnetic core 1, the second magnetic core 2, or the third magnetic core 3, such as... Figure 5 , Figure 8 It is formed on the second magnetic core 2. Figure 9 It is formed on the first magnetic core 1, or it can be formed on both of them at the same time.

[0091] The extension direction of the groove 4 can be as follows: Figure 5 As shown, the numerical values ​​can be extended downwards, or as follows: Figure 8 It extends in both the vertical and horizontal directions, for example... Figure 9 It extends horizontally. Regardless of the specific circumstances, its purpose is to provide more space for winding.

[0092] II. The specific shape of the first magnetic core 1 is not limited in this application; it can be as follows: Figure 2 , Figure 3 , Figure 5 The cylindrical or ring-shaped shapes shown can also be other shapes, the purpose of which is to achieve the winding of the coil.

[0093] The number of the first magnetic core 1 is not limited, for example Figure 11 As shown in the diagram, this is a top view. The first magnetic core 1 is a two-part arc-shaped structure, with the coil wound on its outer side (this is just an illustration; it can also be placed on the inner side). Figure 12 The first magnetic core 1 has eight parts. Figure 11 and Figure 12 For illustrative purposes only, in actual applications, the specific shape, quantity, symmetry, and composition of the first magnetic core 1 are not limited and can be adjusted according to actual needs.

[0094] In Example 2, it is mentioned that "it can be a closed ring or a discontinuous ring," that is, as... Figure 11 and Figure 12 The structure shown can be used as either a transmitter or a receiver.

[0095] III. Regarding the second magnetic core 2, it can be a single piece or divided into sections. The individual core sections can be spaced apart or fitted together without gaps, such as... Figure 13 It has a segmented structure with gaps.

[0096] As mentioned above, the second magnetic core 2 is not necessarily horizontal. When it is a single structure, its surface can have an uneven texture; the second magnetic core 2 can also have a tilt angle. This unevenness or tilt angle can affect parameters such as mutual inductance, thus playing an adjustment role to some extent.

[0097] When the second magnetic core 2 is arranged in blocks, each block can have unevenness and its own tilt angle. Similarly, the first magnetic core 1 can also be arranged with unevenness and tilt angle.

[0098] Regardless of the specific structures of the first magnetic core 1 and the second magnetic core 2, they can all be summarized as having a height difference and / or spacing between them, achieving better magnetic field coupling through matching of magnetic field directions. See also Figure 10 In the diagram, the arrows indicate the direction of the magnetic field. When in operation, the first magnetic core 1 of the receiver is located inside the first magnetic core 1 of the transmitter (this is an example based on Embodiment 2; in actual applications, the transmitter and receiver should be adjusted according to actual needs). At this time, they have matching magnetic field directions. As long as it is within this range, that is, as long as the first magnetic core 1 of the receiver can extend into the annular first magnetic core 1, there will be a good working state, which can also be reflected in the table above. This is also one of the reasons why this application can have a good anti-offset effect.

[0099] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this utility model. The above description is only a preferred embodiment of this utility model, but the scope of implementation of this utility model is not limited to what is shown in the drawings. Any changes made in accordance with the concept of this utility model, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, shall be within the protection scope of this utility model.

Claims

1. A wireless charging system having a magnetic core structure, wherein the magnetic core structure is respectively disposed at a transmitting end and a receiving end, characterized in that, The magnetic core structure has a shell, and inside the shell are: a first magnetic core (1) and a second magnetic core (2) connected together; and the working area of ​​the first magnetic core (1) is not equal to the working area of ​​the second magnetic core (2); There is a height difference and / or spacing between the first magnetic core (1) and the second magnetic core (2), and a coil is wound on the magnetic core structure, the coil having at least two turns; When in working state: The first magnetic core (1) and the second magnetic core (2) generate magnetic fields in opposite directions, either actively or passively. The first magnetic core (1) located at the transmitting end is opposite to the second magnetic core (2) located at the receiving end, and there is a gap between them; The second magnetic core (2) located at the transmitting end is opposite to the first magnetic core (1) located at the receiving end, and there is a gap between them.

2. The wireless charging system according to claim 1, characterized in that, The operating states are divided into: a first operating state and a second operating state; wherein... The first working state is: The first magnetic core (1) located at the transmitting end is opposite to the second magnetic core (2) located at the receiving end, and the smaller working area is completely within the area range of the larger working area; The second magnetic core (2) located at the transmitting end is opposite to the first magnetic core (1) located at the receiving end, and the smaller working area is completely within the area range of the larger working area; The second working state is: The first magnetic core (1) located at the transmitting end is opposite to the second magnetic core (2) located at the receiving end, and the smaller working area partially overlaps with the larger working area; The second magnetic core (2) located at the transmitting end is opposite to the first magnetic core (1) located at the receiving end. The smaller working area partially overlaps with the larger working area.

3. The wireless charging system according to claim 1, characterized in that, The first magnetic core (1) and the second magnetic core (2) are in direct contact and connected; The first magnetic core (1) and the second magnetic core (2) are either a single piece or separate pieces.

4. The wireless charging system according to claim 1, characterized in that, The first magnetic core (1) and the second magnetic core (2) are connected through the third magnetic core (3); The first magnetic core (1), the second magnetic core (2) and the third magnetic core (3) are a single piece; or two of them are a single piece; or all of them are separate pieces.

5. The wireless charging system according to claim 3, characterized in that, The coil is wound on either the first magnetic core (1) or the second magnetic core (2); or, The coil is wound on the contact portion of the first magnetic core (1) and the second magnetic core (2), and on either the first magnetic core (1) or the second magnetic core (2).

6. The wireless charging system according to claim 4, characterized in that, The coil is wound on any one of the first magnetic core (1), the second magnetic core (2), and the third magnetic core (3); or, The coil is wound on the third magnetic core (3) and on either the first magnetic core (1) or the second magnetic core (2).

7. The wireless charging system according to claim 5 or 6, characterized in that, A groove (4) is formed at the part where the coil is wound.

8. The wireless charging system according to claim 1, characterized in that, The first magnetic core (1) is an integral structure, or is composed of multiple spaced individual magnetic cores; The second magnetic core (2) is an integral structure or is composed of multiple spaced individual magnetic cores.

9. The wireless charging system according to claim 1, characterized in that, When in operation, there is an air gap between the first magnetic core (1) located at the transmitting end and the second magnetic core (2) located at the receiving end; There is an air gap between the second magnetic core (2) located at the transmitting end and the first magnetic core (1) located at the receiving end.

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