A wireless charging system based on magnetic coupling resonance mode

Abstract

The application relates to a wireless charging system based on a magnetic coupling resonance mode, and relates to the field of wireless charging.The wireless charging system based on the magnetic coupling resonance mode comprises oppositely arranged transmitting coils and receiving coils; the transmitting coils and the receiving coils each comprise at least one coil array, each coil array comprises a plurality of coil units arranged in a matrix, each coil unit comprises a spiral coil and a ring-shaped feed coil sleeved on the spiral coil, a middle part of one side of the feed coil is disconnected to form an input port and an output port, a middle part of the other side is connected with an adjustable capacitor, the spiral coils of two adjacent coil units in the coil array are opposite in rotation direction, each row of coil units in each coil array is arranged along a curved surface, and the input ports and the output ports of the feed coils contained in each row of coil units are connected in parallel. The wireless charging system based on the magnetic coupling resonance mode can obtain higher system transmission efficiency and power under the conditions of medium and long distance transmission.

Description

Technical Field

[0001] This application relates to the field of wireless charging, and more specifically, to a wireless charging system based on magnetic coupling resonance mode. Background Technology

[0002] With the continuous development of electronic product charging technology, traditional wired charging methods are gradually shifting towards wireless power transfer technology. Based on the power transfer principle and transmission distance, wireless power transfer methods can be mainly divided into three categories: microwave radiation transmission, electromagnetic induction transmission, and magnetic coupling resonance transmission. Among them, magnetic coupling resonance wireless power transfer has become a research and development hotspot in recent years due to its many advantages such as high power, long distance, and no radiation.

[0003] Currently, existing magnetically coupled resonant wireless power transfer coils are generally used as single-input, single-output elements on the transmitting and receiving sides (SISO). Their system transmission efficiency and power can reach a high level within a certain distance. There are also examples of using coils in a vertically stacked form on the transmitting and receiving sides to increase system transmission efficiency and power.

[0004] However, the disadvantages of this type of magnetically coupled resonant wireless power transfer coil system are that it cannot achieve sufficiently high transmission efficiency over medium and long distances and has poor robustness. In addition, it requires a relatively large parasitic coil structure to activate the strong coupling magnetic resonance effect of the entire system. Summary of the Invention

[0005] The purpose of this application is to provide a wireless charging system based on magnetic coupling resonance mode, which can achieve high system transmission efficiency and power under medium and long transmission distance conditions, and has good robustness to changes in the spacing between the transmitting and receiving coils.

[0006] The embodiments of this application are implemented as follows:

[0007] This application provides a wireless charging system based on magnetic coupling resonance mode, which includes a transmitting coil and a receiving coil arranged opposite to each other. Both the transmitting coil and the receiving coil include at least one layer of coil array. Each layer of coil array includes multiple coil units arranged in a matrix. Each coil unit includes a helical coil and an annular feed coil sleeved on the helical coil. The feed coil is disconnected at the middle of one side to form an input port and an output port, and an adjustable capacitor is connected at the middle of the other side. The helical coils of two adjacent coil units in the coil array have opposite directions of rotation. Each row of coil units in each layer of coil array is arranged along a curved surface. Each row of coil units is arranged parallel to each other, and the input port and output port of the feed coil contained therein are connected in parallel.

[0008] In some alternative implementations, each layer of the coil array includes nine coil units arranged in a three-row, three-column matrix.

[0009] In some alternative implementations, both the transmitting coil and the receiving coil comprise a three-layered, spaced-apart coil array.

[0010] In some alternative implementations, the spacing between adjacent layer coil arrays is 0.5-1.5 cm.

[0011] In some alternative implementations, the length and width dimensions of the feed coil in the coil unit are 15.4cm × 15.4cm; the coil gap of the spiral coil is 0.3-0.6cm, and the number of coil turns is 14.25; the diameter of the spiral coil and the feed coil is 0.3-0.5cm.

[0012] In some alternative implementations, the spacing between the centers of the coil arrays of the transmitting coil and the receiving coil is 40-60 cm.

[0013] In some alternative implementations, each row of coil units in the coil array is arranged along a curved surface with a radius of curvature of 40-60 cm.

[0014] The beneficial effects of this application are as follows: The wireless charging system based on magnetic coupling resonance mode provided by this application includes a transmitting coil and a receiving coil arranged opposite to each other; both the transmitting coil and the receiving coil include at least one layer of coil array, each layer of coil array includes multiple coil units arranged in a matrix, each coil unit includes a helical coil and a ring-shaped feed coil sleeved on the helical coil, one side of the feed coil is disconnected to form an input port and an output port, and the other side is connected to an adjustable capacitor, the helical coils of two adjacent coil units in the coil array have opposite rotation directions, each row of coil units in each layer of coil array is arranged along a curved surface, each row of coil units is arranged parallel to each other and the input port and output port of the feed coil contained therein are connected in parallel. The wireless charging system based on magnetic coupling resonance mode provided by this application can achieve high system transmission efficiency and power under medium and long-distance transmission conditions, and has good robustness to changes in the spacing between the transmitting and receiving coils. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of a wireless charging system based on magnetic coupling resonance mode provided in an embodiment of this application;

[0017] Figure 2A schematic diagram of the coil array structure in a wireless charging system based on magnetic coupling resonance mode provided in an embodiment of this application;

[0018] Figure 3 A schematic diagram of the coil unit in a wireless charging system based on magnetic coupling resonance mode provided in an embodiment of this application;

[0019] Figure 4 A schematic diagram of the structure of a wireless charging system based on magnetic coupling resonance mode provided in the embodiments of this application, in which the input port and output port of the feed coil of each row of parallel coil units are connected in parallel with the power supply through an AC-DC converter.

[0020] Figure 5 A partial structural schematic diagram of a wireless charging system based on magnetic coupling resonance mode provided in an embodiment of this application;

[0021] Figure 6 A schematic diagram of the simulation results of the total energy transfer efficiency and frequency in a wireless charging system based on magnetic coupling resonance mode provided in this application embodiment when both the transmitting coil and the receiving coil use a single coil unit;

[0022] Figure 7 A schematic diagram of the simulation test results of energy transfer efficiency and frequency in a wireless charging system based on magnetic coupling resonance mode provided in this application embodiment when both the transmitting coil and the receiving coil adopt a three-layer coil array;

[0023] Figure 8 The maximum energy transfer efficiency curve as a function of distance in the wireless charging system based on magnetic coupling resonance mode provided in the embodiments of this application, where both the transmitting coil and the receiving coil use a single coil unit;

[0024] Figure 9 The maximum energy transfer efficiency curve as a function of distance in the wireless charging system based on magnetic coupling resonance mode provided in the embodiments of this application, where both the transmitting coil and the receiving coil adopt a three-layer coil array.

[0025] In the diagram: 100, transmitting coil; 110, receiving coil; 120, coil array; 130, coil unit; 140, helical coil; 150, feed coil; 160, input port; 170, output port; 180, adjustable capacitor. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] The features and performance of the wireless charging system based on magnetic coupling resonance mode of this application will be further described in detail below with reference to embodiments.

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, this application provides a wireless charging system based on magnetic coupling resonance mode, which includes a transmitting coil 100 and a receiving coil 110 arranged opposite to each other; both the transmitting coil 100 and the receiving coil 110 include a three-layer coil array 120, with a spacing of 1 cm between adjacent layers of the coil array 120. Each layer of the coil array 120 includes nine coil units 130 arranged in a matrix. Each coil unit 130 includes a spiral coil 140 and a ring-shaped feed coil 150 sleeved on the spiral coil 140. One side of the coil array 120 is disconnected in the middle to form an input port 160 and an output port 170. An adjustable capacitor 180 is connected in the middle of the other side as a resonant point. The spiral coils 140 of two adjacent coil units 130 in the coil array 120 have opposite directions of rotation. Each row of coil units 130 in each layer of the coil array 120 is arranged along a curved surface with a radius of curvature of 50cm. The input ports 160 and output ports 170 of the feed coils 150 contained in each row of coil units 130 are arranged in parallel with each other and are connected to the power supply in parallel through an AC-DC converter. The feed coil 150 in coil unit 130 has a length and width of 15.4cm × 15.4cm; the diameter of the spiral coil 140 and the feed coil 150 is 0.4cm, the gap between the spiral coil 140 and the feed coil 150 and the coil gap of the spiral coil 140 are 0.5cm, the number of turns of the spiral coil 140 is 14.25, and the distance between the centers of the coil array 120 of the transmitting coil 100 and the receiving coil 110 is 50cm.

[0035] The wireless charging system based on magnetic coupling resonance mode provided in this application embodiment forms a coil array 120 by arranging nine coil units 130 in a matrix, and then assembling three layers of coil array 120 to form a transmitting coil 100 and a receiving coil 110 arranged opposite to each other. Each coil unit 130 includes a spiral coil 140 and an annular feed coil 150 sleeved on the spiral coil 140. The feed coil 150 is disconnected at the middle of one side to form an input port 160 and an output port 170, and an adjustable capacitor 180 is connected to the middle of the other side. The spiral coils of two adjacent coil units 130 in the coil array 120 are connected in a spiral manner. The coils 140 rotate in opposite directions, and each row of coil units 130 in each layer of coil array 120 is arranged along a curved surface with a radius of curvature of 50 cm. Each row of coil units 130 is arranged in parallel with each other, and the input port 160 and output port 170 of the included feed coil 150 are connected in parallel. Thus, the compact coil array 120 makes the magnetic field distribution more concentrated, forming a highly efficient near-field magnetic coupling mode curved coil system. With adjustable circuit parameters, the full-wave numerical method - method of moments and its fine-line approximation algorithm are used to comprehensively analyze the entire system and optimize circuit parameters such as resonant capacitor and load resistance.

[0036] like Figure 6 As shown, in the wireless charging system based on magnetic coupling resonance mode provided in this embodiment, when both the transmitting coil 100 and the receiving coil 110 use a single coil unit 130, the resonant point is located near the 19.22GHz frequency band. Within this frequency band, the wireless charging transmission efficiency is approximately 54.6%. Figure 7 As shown, in a wireless charging system based on magnetic coupling resonance mode, the total energy transfer efficiency is approximately 83.5% when both the transmitting coil 100 and the receiving coil 110 employ a three-layer coil array 120. Figure 8 and Figure 9 As shown, the maximum energy transfer efficiency versus distance curves when both the transmitting coil 100 and the receiving coil 110 use a single coil unit 130 are as follows: Figure 8 As shown, the maximum energy transfer efficiency versus distance curves when both the transmitting coil 100 and the receiving coil 110 employ a three-layer coil array 120 are as follows: Figure 9 As shown, the wireless charging system based on magnetic coupling resonance mode provided in this embodiment improves the system efficiency and robustness to changes in the spacing between the transceiver coils.

[0037] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A wireless charging system based on magnetic coupling resonance mode, characterized in that, It includes a transmitting coil and a receiving coil arranged opposite to each other; both the transmitting coil and the receiving coil include at least one layer of coil array, each layer of the coil array includes multiple coil units arranged in a matrix, each coil unit includes a helical coil and an annular feed coil sleeved on the helical coil, the feed coil is disconnected at the middle of one side to form an input port and an output port, and an adjustable capacitor is connected at the middle of the other side, the helical coils of two adjacent coil units in the coil array have opposite directions of rotation, each row of coil units in each layer of the coil array is arranged along a curved surface, each row of coil units is arranged parallel to each other, and the input port and the output port of the feed coil included in each row of coil units are connected in parallel.

2. The wireless charging system based on magnetic coupling resonance mode according to claim 1, characterized in that, Each layer of the coil array comprises nine coil units arranged in a three-row, three-column matrix.

3. The wireless charging system based on magnetic coupling resonance mode according to claim 1, characterized in that, Both the transmitting coil and the receiving coil comprise a coil array arranged in three layers at intervals.

4. The wireless charging system based on magnetic coupling resonance mode according to claim 3, characterized in that, The spacing between the coil arrays in adjacent layers is 0.5-1.5 cm.

5. The wireless charging system based on magnetic coupling resonance mode according to claim 1, characterized in that, The length and width of the feed coil in the coil unit are 15.4 cm. 15.4cm; the coil gap of the spiral coil is 0.3-0.6cm, the number of coil turns is 14.25, and the diameter of the spiral coil and the feed coil is 0.3-0.5cm.

6. The wireless charging system based on magnetic coupling resonance mode according to claim 1, characterized in that, The distance between the centers of the coil arrays of the transmitting coil and the receiving coil is 40-60 cm.

7. The wireless charging system based on magnetic coupling resonance mode according to claim 1, characterized in that, Each row of coil units in the coil array is arranged along a curved surface with a radius of curvature of 40-60cm.

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