Wireless charging transmitter and wireless charger

Abstract

This invention relates to the field of wireless charging, disclosing a wireless charging transmitter and a wireless charger. The wireless charging transmitter includes at least two transmitting coils and at least two transmitting circuit units. The at least two transmitting coils simultaneously transmit electrical energy to an external receiving coil, and are connected such that the magnetic fields generated by the at least two transmitting coils are not parallel and form a first angle. The coupling coefficient between the at least two transmitting coils is less than a preset threshold. Each transmitting circuit unit is electrically connected to each transmitting coil and provides current to the transmitting coil. Therefore, the current in each transmitting coil of this wireless charging transmitter generates a corresponding magnetic field. Since each transmitting coil in the transmitting coil group operates simultaneously, the multiple magnetic fields ultimately form a superimposed magnetic field, which provides electrical energy to the receiving coil, thereby improving the power transmission efficiency.

Description

Technical Field

[0001] This invention relates to the field of wireless charging, and in particular to a wireless charging transmitter and a wireless charger. Background Technology

[0002] Wireless charging enables relatively long-distance wireless power conversion, making charging smart devices more flexible. As a result, wireless charging technology is being used more and more widely.

[0003] Traditional wireless charging transmitters typically use a single transmitting coil to send electrical energy to a receiving coil. When the coupling between the transmitting and receiving coils is weak, the charging efficiency of the wireless charging system is reduced. Even when multiple transmitting coils are used to send electrical energy to the receiving coils, the charging of the smart device still relies on the transmitting coils generating a magnetic field in a single direction, resulting in low charging efficiency and poor charging performance. Summary of the Invention

[0004] The present invention addresses at least one of the aforementioned technical problems to a certain extent. To this end, the present invention provides a wireless charging transmitter and a wireless charger, which can improve wireless power transmission efficiency.

[0005] On one hand, embodiments of the present invention provide a wireless charging transmitter, comprising:

[0006] A transmitting coil group, comprising at least two transmitting coils for simultaneously transmitting electrical energy to an external receiving coil, wherein the at least two transmitting coils are connected such that the magnetic fields generated by the currents on the at least two transmitting coils are not parallel and form a first angle, and the coupling coefficient between the at least two transmitting coils is less than a preset threshold.

[0007] At least two transmitting circuit units, each of which is electrically connected to each of the transmitting coils, for supplying current to the transmitting coils.

[0008] In some embodiments, the at least two transmitting coils include a first planar coil and a second planar coil. The plane in which the first planar coil is located is a first plane, and the plane in which the second planar coil is located is a second plane. The first planar coil is placed horizontally, and the first plane and the second plane intersect to form an intersection line. The angle between the first plane and the second plane is [missing information]. The distance from the intersecting line to the center line of the first planar coil is δ1, and the included angle The distance δ1 satisfies a first preset relationship.

[0009] In some embodiments, the first preset relationship is:

[0010]

[0011] Wherein, the included angle Let l be any value in the range (0-90°), and l be the side length of the first planar coil.

[0012] In some embodiments, the first plane and the second plane are intersecting, the first plane and the second plane are orthogonal, and a cross line is formed at the intersection of the first plane and the second plane, the cross line coinciding with the center line of the first plane coil and / or the center line of the second plane coil.

[0013] In some embodiments, the intersecting lines are arranged parallel to the horizontal plane.

[0014] In some embodiments, the at least two transmitting coils include a third planar coil and a fourth planar coil, wherein the plane in which the third planar coil is located is a third plane, the plane in which the fourth planar coil is located is a fourth plane, the third plane and the fourth plane are arranged in parallel, and the fourth planar coil includes a first planar sub-coil and a second planar sub-coil, wherein the winding direction of the first planar sub-coil is opposite to the winding direction of the second planar sub-coil.

[0015] In some embodiments, the center lines of the third planar coil and the fourth planar coil are aligned, and the first planar sub-coil and the second planar sub-coil are symmetrical about the center line of the third planar coil.

[0016] In some embodiments, the fourth planar coil has a figure-eight symmetrical structure.

[0017] In some embodiments, the at least two transmitting coils further include a fifth planar coil, the plane in which the fifth planar coil is located is the fifth plane, the fifth planar coil includes a third planar sub-coil and a fourth planar sub-coil, the winding direction of the third planar sub-coil is opposite to the winding direction of the fourth planar sub-coil, and the fifth planar coil has a figure-eight symmetrical structure, the fifth plane is arranged parallel to the third plane and the fourth plane respectively, and the fifth planar coil is also arranged orthogonally to the fourth planar coil.

[0018] In some embodiments, the at least two transmitting coils further include a sixth and a seventh planar coil. The plane in which the sixth planar coil is located is the sixth plane, and the plane in which the seventh planar coil is located is the seventh plane. Both the sixth and seventh planar coils have a figure-eight symmetrical structure. The sixth plane is arranged parallel to the third and fourth planes, respectively, and the seventh plane is arranged parallel to the third, fourth, and sixth planes, respectively. The sixth, seventh, and fourth planar coils are arranged in an array, and any two adjacent coils of the fourth, sixth, and seventh planar coils partially overlap.

[0019] In some embodiments, the intersecting lines are arranged vertically relative to the horizontal plane.

[0020] In some embodiments, the at least two transmitting coils further include an eighth planar coil, the plane in which the eighth planar coil is located is the eighth plane, the eighth plane is orthogonal to the first plane and the second plane respectively, and the center of the eighth planar coil is located on the intersection line.

[0021] In some embodiments, the outer diameter of the eighth planar coil is greater than the outer diameter of the first planar coil and the outer diameter of the second planar coil.

[0022] In some embodiments, the at least two transmitting coils include three curved coils that together form a rotating body structure, and any two adjacent curved coils partially overlap along the circumference of the rotating body structure.

[0023] In some embodiments, the at least two transmitting coils further include a ninth planar coil, the plane in which the ninth planar coil is located is a ninth plane, the ninth plane is orthogonally arranged to the axis of the rotating body structure, and the center of the ninth planar coil is located on the axis of the rotating body structure.

[0024] In some embodiments, the ninth planar coil includes inner and outer sub-coils connected in series. The center of the inner sub-coil and the center of the outer sub-coil are both located on the axis of the rotating body structure. The diameter of the inner sub-coil is smaller than the diameter of the rotating body structure, and the diameter of the outer sub-coil is larger than the diameter of the cylindrical structure. The winding directions of the inner and outer sub-coils are opposite.

[0025] In some embodiments, the rotating body structure is a cylindrical structure, and the three curved coils are arranged in an array around the axis of the cylindrical structure.

[0026] In some embodiments, the horizontal center lines of the three curved coils are located on the ninth plane.

[0027] In some embodiments,

[0028] The rotating body structure is a frustum structure, and the three curved coils are arranged in an array around the axis of the frustum structure.

[0029] In some embodiments, the frustum structure includes a generatrix and a lower base surface, the angle between any radius on the lower base surface and the generatrix is ​​δ, the distance between the ninth plane and the center plane of the frustum structure is δ2, and the angle and the distance δ2 satisfy a second preset relationship.

[0030] In some embodiments, the distance δ2 gradually increases as the included angle decreases.

[0031] In some embodiments, when the included angle is any value between [15°-90°), the ratio of the distance δ2 to the height of the frustum is any value between [50%-0).

[0032] In some embodiments,

[0033] The at least two transmitting coils include at least two tenth coils, each of the tenth coils including a first part and a second part, the first part and the second part having a first connecting part, the first part and the second part being symmetrical about the first connecting part, and the coil winding direction of the first part being opposite to the coil winding direction of the second part, the first part and the second part of each tenth coil being located on a first curved surface, and the first part and the second part of each tenth coil being arranged in an array on the first curved surface.

[0034] In some embodiments, the first curved surface is a sphere, and the at least two transmitting coils further include an eleventh coil, which is a ring coil disposed on the outer surface of the sphere, and the center of the eleventh coil is located on the axis of the sphere.

[0035] In some embodiments, the first surface is an annular surface, and the at least two transmitting coils further include a twelfth planar coil, the plane in which the twelfth planar coil is located is the twelfth plane, the twelfth plane is a bottom surface of the annular surface, and the center of the twelfth planar coil is located on the axis of the annular surface.

[0036] Secondly, embodiments of the present invention provide a wireless charger, the wireless charger comprising:

[0037] The wireless charging transmitter as described above; and

[0038] A housing for accommodating the wireless charging transmitter.

[0039] Compared with the prior art, the present invention has at least the following beneficial effects: The wireless charging transmitter of the present invention includes at least two transmitting coils and at least two transmitting circuit units. The at least two transmitting coils are used to simultaneously transmit electrical energy to an external receiving coil, and each transmitting circuit unit is electrically connected to each transmitting coil to provide current to the transmitting coil. Therefore, the wireless charging transmitter can provide current to the corresponding transmitting coil through each transmitting circuit unit, allowing the transmitting coils in the transmitting coil group to work simultaneously. The current on each transmitting coil generates a corresponding magnetic field. When multiple transmitting coils work simultaneously, the multiple magnetic fields ultimately form a superimposed magnetic field, which is then used to transmit electrical energy to the external receiving coil, thereby improving the power transmission efficiency. Furthermore, when the transmitting coil group works simultaneously, the magnetic field directions generated by each transmitting coil are not parallel and form a first angle, and the self-coupling coefficient between the transmitting coils is less than a preset threshold. This reduces self-coupling interference when the transmitting coils work simultaneously, further improving the power transmission efficiency. Attached Figure Description

[0040] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0041] Figure 1 This is a schematic diagram of an application scenario for a wireless charging transmitter provided in an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the structure of a wireless charging transmitter provided in an embodiment of the present invention;

[0043] Figure 3a This is a schematic diagram of the structure of a first planar coil and a second planar coil provided in an embodiment of the present invention;

[0044] Figure 3b yes Figure 3a A schematic diagram of the magnetic field structure generated by the current on the second planar coil in the diagram;

[0045] Figure 4 This is one of the included angles provided in the embodiments of the present invention. A schematic diagram of the relationship curve between the distance δ1 and the distance δ1;

[0046] Figure 5a This is a schematic diagram of the structure of a first planar coil and a second planar coil provided in an embodiment of the present invention;

[0047] Figure 5b This is a schematic diagram of the structure of a first planar coil and a second planar coil provided in an embodiment of the present invention;

[0048] Figure 5c This is a schematic diagram of the structure of a first planar coil and a second planar coil provided in an embodiment of the present invention;

[0049] Figure 5d This is a schematic diagram of the structure of a first planar coil and a second planar coil provided in an embodiment of the present invention;

[0050] Figure 5e This is a schematic diagram of the structure of a first planar coil and a second planar coil provided in an embodiment of the present invention;

[0051] Figure 6a This is a schematic diagram of the structure of a first planar coil and a second planar coil provided in an embodiment of the present invention;

[0052] Figure 6b yes Figure 6a A schematic diagram of the magnetic field structure generated by the current on the first planar coil in the diagram;

[0053] Figure 6c This is a schematic diagram of the structure of a first planar coil and a second planar coil provided in an embodiment of the present invention;

[0054] Figure 6d yes Figure 6c A schematic diagram of the magnetic field structure generated by the current on the second planar coil in the diagram;

[0055] Figure 7a This is a schematic diagram of the structure of one of the third planar coils and the fourth planar coil provided in an embodiment of the present invention;

[0056] Figure 7b yes Figure 7a A schematic diagram of the magnetic field structure generated by the current on the fourth plane coil in the diagram;

[0057] Figure 7c yes Figure 7a A schematic diagram of the magnetic field structure generated by the current in the third and fourth planar coils;

[0058] Figure 8a This is a schematic diagram of the structure of a third planar coil, a fourth planar coil, and a fifth planar coil provided in an embodiment of the present invention;

[0059] Figure 8b yes Figure 8a A schematic diagram of the magnetic field structure generated by the currents in the three-plane coil, the fourth-plane coil, and the fifth-plane coil;

[0060] Figure 8c This is a schematic diagram of the structure of a third planar coil, a fourth planar coil, a sixth planar coil, and a seventh planar coil provided in an embodiment of the present invention;

[0061] Figure 9a This is a schematic diagram of the structure of a first planar coil and a second planar coil provided in an embodiment of the present invention;

[0062] Figure 9b This is a schematic diagram of the structure of a first planar coil, a second planar coil, and an eighth planar coil provided in an embodiment of the present invention;

[0063] Figure 9c This is a schematic diagram of the structure of a first planar coil, a second planar coil, and an eighth planar coil provided in an embodiment of the present invention;

[0064] Figure 9d This is a schematic diagram of the structure of a first planar coil, a second planar coil, and an eighth planar coil provided in an embodiment of the present invention;

[0065] Figure 10a This is a schematic diagram of the structure of a first curved surface coil, a second curved surface coil, and a third curved surface coil provided in an embodiment of the present invention;

[0066] Figure 10b yes Figure 10a A top-view schematic diagram of the normal vector structure of the first, second, and third surface coils;

[0067] Figure 10c yes Figure 10a A schematic diagram of the magnetic field structure generated by the currents on the first, second, and third curved surface coils in the diagram;

[0068] Figure 11a This is a schematic diagram of the structure of a first curved surface coil, a second curved surface coil, a third curved surface coil, and a ninth planar coil provided in one embodiment of the present invention;

[0069] Figure 11b yes Figure 11a A schematic diagram of the magnetic field structure generated by the current in the ninth plane coil.

[0070] Figure 11c This is a schematic diagram of the structure of a first curved surface coil, a second curved surface coil, a third curved surface coil, and a ninth planar coil provided in one embodiment of the present invention;

[0071] Figure 11d yes Figure 11c A schematic diagram showing the current flow direction of the inner and outer sub-coils on the ninth plane coil and the magnetic field structure generated by the current on the inner and outer sub-coils.

[0072] Figure 11e yes Figure 11c A schematic diagram of the magnetic field structure generated by the current on the inner and outer sub-coils of the ninth planar coil;

[0073] Figure 12a This is a schematic diagram of a structure provided in an embodiment of the present invention where the first curved surface coil, the second curved surface coil, and the third curved surface coil are all inclined curved surfaces;

[0074] Figure 12b yes Figure 12a A top-view schematic diagram of the normal vector structure of the first, second, and third surface coils;

[0075] Figure 12c yes Figure 12a A schematic diagram of the magnetic field structure generated by the current on one of the three curved surface coils in the first, second, and third curved surface coils;

[0076] Figure 13a This is a schematic diagram of the structure of the ninth planar coil when the first curved surface coil, the second curved surface coil, and the third curved surface coil are all inclined curved surfaces, according to one of the embodiments of the present invention.

[0077] Figure 13b yes Figure 13a A schematic diagram of the magnetic field structure generated by the current on one of the surface coils when the first, second, and third surface coils are all inclined surfaces;

[0078] Figure 13c This is a schematic diagram of the structure of the ninth planar coil when the first curved surface coil, the second curved surface coil, and the third curved surface coil are all inclined curved surfaces, according to one of the embodiments of the present invention.

[0079] Figure 14a This is a schematic diagram of the structure of two tenth coils provided in one embodiment of the present invention;

[0080] Figure 14b This is a schematic diagram of one of the three tenth coils provided in an embodiment of the present invention;

[0081] Figure 14c This is a schematic diagram of the structure of two tenth coils and an eleventh coil provided in one embodiment of the present invention;

[0082] Figure 14d This is a schematic diagram of the structure of two tenth coils and an eleventh coil provided in one embodiment of the present invention;

[0083] Figure 14e This is a schematic diagram of the structure of two tenth coils provided in one embodiment of the present invention. Detailed Implementation

[0084] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0085] It should be noted that, unless otherwise specified, the various features in the embodiments of this invention can be combined with each other, all of which are within the protection scope of this invention. Furthermore, although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than the module division in the device or the order in the flowchart. Moreover, the terms "first," "second," and "third" used in this invention do not limit the data or execution order, but only distinguish identical or similar items with essentially the same function and effect.

[0086] Please see Figure 1 , Figure 1 This is a schematic diagram of an application scenario for a wireless charging transmitter provided in an embodiment of the present invention, such as... Figure 1As shown, the wireless charging transmitter 10 is used in the wireless charging system 100. The wireless charging system 100 includes the wireless charging transmitter 10 and the wireless charging receiver 20. The wireless charging receiver 20 can be located in a smart terminal, which can be of any type and is used to establish a coupling connection with the wireless charging transmitter 10, such as a mobile phone, tablet computer, watch, or smart remote control. The wireless charging transmitter 10 can be located in a wireless charger, charging dock, or desktop 400. If the wireless charging transmitter 10 is located in a wireless charger, the wireless charger also includes a housing 14, in which the wireless charging transmitter is housed. The shape of the housing 14 can match the shape of the wireless charger, and it can be cylindrical, frustum-shaped, prism-shaped, or frustum-shaped. The wireless charging transmitter 10 is also electrically connected to a DC power supply 200, which supplies power to the wireless charging transmitter 10. The DC power supply 200 can be the power obtained by rectifying the mains power through a rectifier circuit. The wireless charging receiver 20 is also electrically connected to the smart terminal 300 for charging the smart terminal 300. Specifically, it charges the battery of the smart terminal 300. When the smart terminal's battery needs charging, the wireless charging transmitter 10 transmits electrical energy from the DC power supply 200 through its transmitting coil after a series of conversions. The transmitting coil is coupled to the receiving coil in the wireless charging receiver 20. The transmitting coil transmits electrical energy to the receiving coil, which receives the energy. The internal circuitry of the wireless charging receiver 20 then processes the energy accordingly to charge the smart terminal 300.

[0087] Please see Figure 2 , Figure 2 This invention provides a wireless charging transmitter 10, which includes a transmitting coil group 11 and at least two transmitting circuit units 12. The transmitting coil group 11 includes at least two transmitting coils. Figure 2 The system comprises two transmitting coils and two transmitting circuit units, namely a first transmitting circuit unit 121, a second transmitting circuit unit 122, a first transmitting coil 111, and a second transmitting coil 112. The first transmitting circuit unit 121 is electrically connected to the first transmitting coil 111, and the second transmitting circuit unit 122 is electrically connected to the second transmitting coil 112. The transmitting circuit unit 122 is used to provide current to the corresponding transmitting coil 11. In some embodiments, the transmitting circuit unit further includes a controller for controlling the current on the transmitting coils, as well as for the logic operations and related processing of the entire wireless charging transmitter.

[0088] The DC power supply 200 is also electrically connected to the first transmitting circuit unit 121 and the second transmitting circuit unit 122, respectively, for providing DC power supply 200 to the first transmitting circuit unit 121 and the second transmitting circuit unit 122, respectively. The first transmitting circuit unit 121 and the second transmitting circuit unit 122 respectively convert the DC power supply 200 into AC current, and then provide the AC current to the corresponding transmitting coil 11.

[0089] The wireless charging receiver 20 includes a receiving coil 21 and an internal circuit 22 of the receiver system. The receiving coil 21 is coupled to the first transmitting coil 111 and the second transmitting coil 112 respectively, receives the electrical energy of the transmitting coil 11, and processes the electrical energy through the internal circuit 22 of the receiver system to charge the battery.

[0090] In a wireless charging coil array, the transmitting coils operate simultaneously. The current in each transmitting coil generates a corresponding magnetic field. When multiple transmitting coils operate concurrently, these magnetic fields ultimately form a superimposed magnetic field, which then powers the receiving coil. Compared to a single magnetic field powering the receiving coil, this superimposed magnetic field improves wireless power transmission efficiency, resulting in better charging performance.

[0091] Furthermore, the coupling between the two transmitting coils is the first coupling, the coupling between the first transmitting coil and the receiving coil is the second coupling, and the coupling between the second transmitting coil and the receiving coil is the third coupling. If the first coupling is not significantly less than the second or third coupling, the wireless power transmission efficiency will be reduced. In this embodiment of the invention, the two transmitting coils can be PCB circuit board coils, coils wound with metal wire, or coils made by cutting or etching metal wire and fixed together by a mechanical structure, etc. The two transmitting coils are connected to each other through a circuit board or other mechanical structure. Through the coil structure design, the magnetic fields generated by the currents on the two transmitting coils are not parallel and form a first angle, which is any value in the range (0-180°). The magnetic fields generated by the currents on the two transmitting coils near the coils can form a superimposed magnetic field, thereby enabling the two transmitting coils to work together. By superimposing the magnetic field, the wireless charging receiver can better receive electrical energy. At the same time, the coupling coefficient of the first coupling can be less than a preset threshold, that is, the coupling strength of the first coupling is reduced, so that most of the wireless power is transmitted to the receiving coil through the second and third couplings. The preset threshold can be set according to user needs. In this embodiment of the invention, it can be 0.02.

[0092] Therefore, the wireless charging transmitter provides current to the corresponding transmitting coils through multiple transmitting circuit units. The current on each transmitting coil generates a corresponding magnetic field. When multiple transmitting coils work simultaneously, the magnetic fields generated by each transmitting coil together form a superimposed magnetic field. Thus, the wireless charging transmitter can provide power to the receiving coil through the superimposed magnetic field, thereby improving the efficiency of wireless power transmission and resulting in better charging performance.

[0093] When multiple coils operate simultaneously, the coupling between the transmitting coils poses several challenges to system operation. If strong coupling exists between multiple transmitting coils simultaneously transmitting power, the alternating magnetic field generated by one transmitting coil will induce voltages in the other transmitting coils, creating circulating currents in those coils and the surrounding circuitry. This circulating current not only dissipates some of the power supplied by that transmitting coil but also affects the operation of other transmitting circuits, reducing power conversion efficiency. If the coupling between the transmitting and receiving coils is weak, the power consumed due to coupling between multiple transmitting coils will be significantly greater than, or even far exceed, the power transmitted to the wireless charging receiver, reducing wireless power transmission efficiency. Furthermore, strong coupling between multiple transmitting coils can interfere with the signal in the wireless charging transmitter circuitry, leading to difficulties in system control.

[0094] Please refer to the following: Figures 2 to 14d In some embodiments, the at least two transmitting coils 11 include a first planar coil 11a and a second planar coil 11b. The plane on which the first planar coil 11a is located is the first plane, and the plane on which the second planar coil 11b is located is the second plane. The first planar coil 11a is placed horizontally, and the first plane and the second plane intersect to form an intersection line 131. The first plane and the second plane may also be arranged orthogonally. In some embodiments, the structural schematic diagram of the first planar coil 11a and the second planar coil 11b is shown below. Figure 3a As shown, the first planar coil 11a and the second planar coil 11b intersect, with the second planar coil 11b positioned on one side of the first planar coil 11a. The two planar coils are mechanically connected by their respective support structures (here, printed circuit boards, PCBs) 13. The intersection line 131 of the two coils is also the intersection line of the circuit board. The magnetic field generated by the second planar coil 11b is as follows: Figure 3b As shown, the angle between the first plane and the second plane is... The distance δ1 between the intersecting line 131 and the center line of the first planar coil 11a is δ1, and the included angle and the distance δ1 satisfy a first preset relationship. The size and shape of the coils can be set according to user needs; for example, the two planar coils can be two 200x300mm rectangular planar transmitting coils. Through the above structural design of the transmitting coils, the magnetic field directions generated by the two transmitting coils can be aligned at a first angle, enabling the two transmitting coils to work collaboratively. Simultaneously, the coupling coefficient between the transmitting coils is less than a preset threshold, or even zero coupling is achieved. This structural design of the transmitting coils is more flexible in practical applications. As long as the first preset relationship is satisfied, the coupling coefficient between the two transmitting coils can be less than the preset threshold, reducing self-coupling strength, thereby reducing interference and further improving wireless power transmission efficiency.

[0095] In some embodiments, the second planar coil 11b is disposed on one side of the first planar coil 11a, at the included angle. When the distance δ1 satisfies the first preset relationship, the magnetic flux of the magnetic field generated by the current on the second planar coil 11b entering and exiting the first planar coil 11a can be equal, that is, the net magnetic flux is zero or less than a certain preset threshold, and the mutual inductance between the two transmitting coils is less than a certain preset threshold, or even zero, so that the effect of zero coupling can be achieved.

[0096] In some embodiments, the first preset relationship is:

[0097]

[0098] Wherein, the included angle Let l be any value within the range (0-90°), and l be the side length of the first planar coil 11a. Taking two 200x300mm rectangular planar transmitting coils as an example, when the two transmitting coils are zero-coupled, the included angle is... The relationship curve between the distance δ1 and the distance δ1 is as follows: Figure 4 As shown, Figure 4 The horizontal axis is the included angle. The vertical axis represents the distance δ1.

[0099] There are various coil combination configurations that conform to this first preset relationship; please refer to [link / reference]. Figure 5a When the included angle between the first planar coil 11a and the second planar coil 11b When the angle is close to zero (i.e., the two coil planes are nearly parallel), in order to achieve zero coupling between the two coils, the two transmitting coils need to partially overlap, and the distance δ1 is also the largest of all combinations (approximately 35 mm). This difference varies with the angle between the two transmitting coils. Gradually increase (from) Figure 5b 50° Figure 5c65°, to Figure 5d To achieve zero coupling (75°), the distance δ1 is gradually decreased until the two coils are orthogonal, such as... Figure 5e As shown, the vertical coil is located exactly on the center line of the horizontal coil. Figures 5a to 5e In these combinations, not only is zero coupling achieved between the two transmitting coils, but two nearly orthogonal magnetic field components are also provided, making it possible for the two coils to work together to control the direction of the space magnetic field and extend the total magnetic field coverage. Here Figures 5a to 5e The coil combination configurations described herein can effectively avoid circulating currents and interference caused by the coupling of two transmitting coils between the two transmitting circuits, enabling the dual transmitting coils to work together. Moreover, when a charging device (such as a mobile phone) is placed on a single transmitting coil, the configuration of one transmitting coil being placed flat and the other tilted also conforms to the wireless charging device placement habits developed by users when using wireless charging pad products.

[0100] In some embodiments, such as Figure 6a As shown, the first plane and the second plane intersect, are orthogonal, and form a crossing line 132 at their intersection. This crossing line 132 coincides with the center line of both the first planar coil 11a and the second planar coil 11b. In this embodiment, the crossing line 132 is the same as the intersecting line 131 described above. The crossing line 132 can also be parallel to the horizontal plane. In some embodiments, the crossing line 132 can also be vertically positioned relative to the horizontal plane. A schematic diagram of the magnetic field generated when current flows through the first planar coil 11a is shown below. Figure 6b As shown, the magnetic field generated by the first planar coil 11a is parallel to the second plane near the second planar coil 11b, meaning the magnetic flux through the second plane is zero. Similarly, the magnetic field generated when the current flows through the second planar coil 11b will not pass through the first plane. Therefore, the mutual inductance between the two transmitting coils is zero, achieving zero coupling.

[0101] In some embodiments, such as Figure 6c As shown, another zero-coupling transmitting coil group structure also consists of orthogonal first planar coil 11a and second planar coil 11b. However, unlike the first planar coil 11a, the cross line 132 is located only at the center line of the first planar coil 11a, not at the center line of the second planar coil 11b. The first planar coil 11a is offset from the center line of the second planar coil 11b. A schematic diagram of the magnetic field generated when current flows through the second planar coil 11b is shown below. Figure 6dAs shown, although the cross line 132 is not simultaneously located at the center line of the first planar coil 11a and the second planar coil 11b, due to the closed-loop characteristic of the magnetic field, the magnetic field generated by the second planar coil 11b enters the first planar coil 11a on one side of the second planar coil 11b, and at the same time, a magnetic field of equal amplitude exits on the other side. Therefore, the net magnetic flux of the magnetic field generated by the second planar coil 11b passing through the first planar coil 11a is zero, and the mutual inductance between the two transmitting coils is still zero, achieving zero coupling.

[0102] In some application scenarios, users have high requirements for the aesthetics and concealment of wireless charging transmitters (such as under-desk installation). This necessitates a new all-planar transmitting coil group structure to achieve multi-coil collaborative operation for greater spatial freedom in wireless charging, and to ensure that the coupling coefficient between each transmitting coil is less than a preset threshold. Therefore, in some embodiments, the at least two transmitting coils include a third planar coil 11c and a fourth planar coil 11d. The plane on which the third planar coil 11c is located is the third plane, and the plane on which the fourth planar coil 11d is located is the fourth plane. The third plane and the fourth plane are arranged parallel to each other. The fourth planar coil 11d includes a first planar sub-coil 11d1 and a second planar sub-coil 11d2. The winding direction of the first planar sub-coil 11d1 is opposite to the winding direction of the second planar sub-coil 11d2. Through the structural design of the third planar coil 11c and the fourth planar coil 11d, the coupling coefficient between the transmitting coils can be made less than a preset threshold.

[0103] In some embodiments, the first planar sub-coil 11d1 may be symmetrical to the second planar sub-coil 11d2, in which case the line of symmetry between the first planar sub-coil 11d1 and the second planar sub-coil 11d2 is aligned with the center line of the third planar coil 11c. Alternatively, the first planar sub-coil 11d1 may be asymmetrical to the second planar sub-coil 11d2, in which case the connecting line between the first planar sub-coil 11d1 and the second planar sub-coil 11d2 is also not aligned with the center line of the third planar coil 11c.

[0104] In some embodiments, please refer to Figure 7a , Figure 7a This is one embodiment of the transmitting coil structure of the present invention, where each transmitting coil may include one or more turns of coil structure. In this figure and the structural diagrams of the following embodiments, the multi-turn coil structure is represented by its outer contour. Figure 7aAs shown, the fourth planar coil 11d has a figure-eight structure, meaning the first planar sub-coil 11d1 is wound clockwise, while the second planar sub-coil 11d2 is wound counterclockwise. It should be noted that the first planar sub-coil 11d1 can also be wound counterclockwise, and the second planar sub-coil 11d2 can also be wound clockwise, as long as the winding directions of the two planar sub-coils are opposite. The line of symmetry between the first planar sub-coil 11d1 and the second planar sub-coil 11d2 is aligned with the center line of the third planar coil 11c. This arrangement ensures that the magnetic flux entering and exiting the third planar coil 11c generated by the first and second planar sub-coils 11d1 and 11d2 is approximately equal, resulting in a total magnetic flux of the magnetic fields generated by the first and second planar sub-coils 11d1 and 11d2 on the third planar coil 11c that is essentially zero, or even achieves zero coupling.

[0105] like Figure 7b As shown, when current flows through the fourth plane coil 11d, two magnetic fields with opposite directions will appear on the plane of the fourth plane coil 11d. These two magnetic fields are magnetic field A and magnetic field B, and they are also perpendicular to the fourth plane coil 11d. Figure 7c As shown, if the transmitting coil 11 of the wireless charging terminal is placed on the desktop 400, magnetic fields A and B are superimposed above the coil to generate a transverse magnetic field parallel to the plane of the two planar coils. The magnetic field generated by the third planar coil 11c is magnetic field C, which is nearly orthogonal to the magnetic field generated by the fourth planar coil 11d in a large spatial range. The wireless charging transmitter can control the current supplied to the third planar coil 11c and the fourth planar coil 11d to adjust the direction of the superimposed magnetic field generated by the two planar coils, so as to achieve better coordination between multiple transmitting coils.

[0106] Figures 7a-7c The dual-transmitter coil structure shown is suitable for scenarios where the user's orientation is relatively fixed when interacting with the terminal device 300, such as an office desk, where the user usually sits in a fixed direction, and the rotation range of the terminal device 300 (such as a mobile phone) about the axis perpendicular to the coil plane is limited. In scenarios where the user's orientation is uncertain when interacting with the terminal device 300, such as a coffee table, where the user may sit along the table from any angle, a multi-transmitter coil structure that can support a 360° wireless charging range is required.

[0107] In some embodiments, to support a multi-transmitter coil structure with a 360° wireless charging range, and to ensure that the coupling coefficient between each transmitter coil is less than a preset threshold, please refer to [link to relevant documentation]. Figure 8a ,exist Figure 7aBased on this, the at least two transmitting coils further include a fifth planar coil 11e, located on a fifth plane. The fifth planar coil 11e also includes a third planar sub-coil 11e1 and a fourth planar sub-coil 11e2. The winding direction of the third planar sub-coil 11e1 is opposite to that of the fourth planar sub-coil 11e2, and the fifth planar coil 11e also has a figure-eight symmetrical structure. The fifth plane is parallel to both the third and fourth planes, and the fifth planar coil 11e is orthogonal to the fourth planar coil 11d. The center point of the third planar coil 11c is located on the line of symmetry of the fifth planar coil 11e, and the winding directions of the two symmetrical structures of the fifth planar coil 11e are opposite. If the fourth planar coil 11d is longitudinally positioned, the fifth planar coil 11e is transversely positioned relative to the fourth planar coil 11d. The fourth planar coil 11d and the fifth planar coil 11e generate transverse and longitudinal magnetic fields at the center of the coil group, respectively, which are nearly orthogonal to the magnetic field generated by the third planar coil 11c perpendicular to the third plane. Therefore, the total magnetic flux through the third plane coil 11c from the magnetic field generated by the fifth plane coil 11e is essentially zero, achieving zero coupling. Similarly, due to the symmetrical structure of the fifth plane coil 11e and the orthogonality between its center lines and the fourth plane coil 11d, the total magnetic field entering the fourth plane coil 11d and exiting the fourth plane coil 11d generated by the fifth plane coil 11e is essentially equal. Therefore, zero coupling also exists between the two figure-eight planar coils in the transmitting coil group. The added transverse figure-eight fifth plane coil 11e can... Figure 7a Based on the dual-transmitting coil system, a lateral magnetic field component is provided to achieve 360° coverage of the wireless charging range. Furthermore, the coupling coefficient between each transmitting coil is less than a preset threshold, or even achieves zero coupling, which allows each transmitting circuit unit to operate almost independently with virtually no circulating current or interference, thus improving power transmission efficiency.

[0108] Figure 8a The three planar coils in the illustrated transmitting coil group generate three nearly orthogonal magnetic fields above the coil plane, and the coils are decoupled from each other (coupling is zero). This coil group structure allows three transmitting circuit units to simultaneously drive the coils to work collaboratively, achieving greater spatial freedom in wireless charging. Figure 8bAs shown, the wireless charging transmitter is mounted below a circular tabletop 400. When a user holds a terminal device 300 (such as a mobile phone) near the tabletop 400 in the posture shown in the figure, the wireless charging receiver coil (not shown) is coupled to varying degrees with the three transmitting coils. Specifically, the magnetic field D generated by the third planar coil 11c at the location of the mobile phone is nearly perpendicular to the tabletop 400; the magnetic field E generated by the fourth planar coil 11d at the location of the mobile phone is nearly parallel to the tabletop 400; and the magnetic field F generated by the fifth planar coil 11e at the location of the mobile phone is nearly parallel to the tabletop 400 and nearly perpendicular to the magnetic field E generated by the fourth planar coil 11d. When the three transmitting coils operate simultaneously and generate in-phase magnetic fields, the magnetic fields at the location of the receiver device are superimposed to produce a stronger magnetic field G that is nearly perpendicular to the receiver coil. This superimposed magnetic field G has a larger amplitude than the magnetic fields (D, E, F) generated by a single coil and can achieve better directional matching with the receiver coil, resulting in higher coupling. Under the combined effect of a stronger magnetic field and better coupling, the system can achieve higher energy transfer efficiency. As mentioned earlier, the spatial magnetic fields generated by the three transmitting coils are nearly orthogonal over a large area near the coils. When the receiving device appears in any spatial position near the desktop 400 above the third plane coil 11c, fourth plane coil 11d, and fifth plane coil 11e of the transmitting end in any aerial posture, the wireless charging transmitter can adjust each magnetic field, and thus adjust the superimposed magnetic field, to achieve a larger wireless charging range and support a wider range of aerial postures for the receiving device compared to single-coil operation. Furthermore, the zero-coupling characteristic between each transmitting coil ensures that there is virtually no circulating current or interference between the multiple transmitting circuit units, allowing them to operate almost independently.

[0109] In some embodiments, please refer to Figure 8cThe at least two transmitting coils further include a sixth planar coil 11f and a seventh planar coil 11g. The plane in which the sixth planar coil 11f is located is the sixth plane, and the plane in which the seventh planar coil 11g is located is the seventh plane. The sixth planar coil 11f includes a fifth planar sub-coil 11f1 and a sixth planar sub-coil 11f2. The seventh planar coil 11g includes a seventh planar sub-coil 11g1 and an eighth planar sub-coil 11g2. The winding directions of the fifth planar sub-coil 11f1 and the sixth planar sub-coil 11f2 are opposite, and the winding directions of the seventh planar sub-coil 11g1 and the eighth planar sub-coil 11g2 are opposite. Sub-coil 11f1 and the sixth plane sub-coil 11f2 both have a figure-eight symmetrical structure, as do the seventh plane sub-coil 11g1 and the eighth plane sub-coil 11g2. The sixth plane is parallel to the third and fourth planes, and the seventh plane is parallel to the third, fourth, and sixth planes. The sixth plane coil 11f, the seventh plane coil 11g, and the fourth plane coil 11d are arranged in an array, and any two adjacent sub-coils among the fourth plane coil 11d, the sixth plane coil 11f, and the seventh plane coil 11g partially overlap. The center point of the third plane coil 11c is located on the line of symmetry between the sixth and seventh plane coils 11g. The overlap between adjacent sub-coils can be controlled by adjusting the dimensions of the sub-coils of the fourth plane coil 11e, the sixth plane coil 11f, and the seventh plane coil 11g. Under specific dimensions, zero coupling can be achieved between adjacent and overlapping sub-coils. For example... Figure 8c In the sixth planar coil 11f, the fifth planar sub-coil 11f1 is adjacent to and overlaps with the seventh planar sub-coil 11g1 of the seventh planar coil 11g. Under certain dimensions, the total flux of the magnetic field generated by the fifth planar sub-coil 11f1 of the sixth planar coil 11f through the seventh planar sub-coil 11g1 of the seventh planar coil 11g is essentially zero, achieving zero coupling. Similarly, due to the symmetrical structure of the sixth planar coil 11f and the seventh planar coil 11g, the coupling between the sixth planar sub-coil 11f2 of the sixth planar coil 11f and the eighth planar sub-coil 11g2 of the seventh planar coil 11g is also zero. Therefore, the total coupling between the sixth planar coil 11f and the seventh planar coil 11g in the transmitting coil group is also zero. The three figure-eight coils achieve an array of magnetic fields parallel to the coil plane, enabling 360° coverage of the wireless charging range. Furthermore, the coupling coefficient between each transmitting coil is less than the preset threshold, or even achieves zero coupling, which allows each transmitting circuit unit to operate almost independently with virtually no circulating current or interference, thus improving power transmission efficiency.

[0110] In some embodiments, when the first planar coil 11a and the second planar coil 11b are orthogonal, if the intersection line 132 (i.e., the orthogonal line) of the first planar coil 11a and the second planar coil 11b is vertically arranged relative to the horizontal plane, such as Figure 9a As shown, the transmitting coil system of the wireless charging transmitter consists of two vertically placed orthogonal first planar coils 11a and second planar coils 11b. The crossing line 132 is vertically placed relative to the horizontal plane, so the two transmitting coils can each provide a magnetic field perpendicular to their respective planes. That is, the first planar coil 11a can provide a magnetic field perpendicular to the first plane, and the second planar coil 11b can provide a magnetic field perpendicular to the second plane. Furthermore, the center line of the first planar coil 11a is aligned with the center line of the second planar coil 11b. Through the above structural design of the transmitting coils, zero coupling between the transmitting coils can be achieved. The first planar coil 11a and the second planar coil 11b can be placed inside a cylindrical shell 14 and placed on a desktop 400. No matter which angle the user moves the terminal device 300 (such as a mobile phone) into the wireless charging range of the wireless charging transmitter from any angle around the desktop 400, the terminal device 300 can be wirelessly charged efficiently.

[0111] In some embodiments, the at least two transmitting coils further include an eighth planar coil 11h, the plane on which the eighth planar coil 11h is located is the eighth plane, which is orthogonal to the first plane and the second plane respectively, and the center of the eighth planar coil 11h is located on the intersection line 132. The eighth planar coil 11h can move up and down along the intersection line 132, but the center of the eighth planar coil 11h always remains on the intersection line 132, and the eighth planar coil 11h is always orthogonal to the first plane and the second plane respectively. In one embodiment, as... Figure 9b As shown, the eighth planar coil 11h is disposed at the bottom of the first planar coil 11a and the second planar coil 11b. The outer diameter of the eighth planar coil 11h can be equal to the outer diameter of the first planar coil 11a and the second planar coil 11b. This three-transmitting coil system can work together to realize a desktop transmitter for 360° wireless charging. Through the above-described structural design of the transmitting coils, zero coupling between the first planar coil 11a and the eighth planar coil 11h, as well as zero coupling between the second planar coil 11b and the eighth planar coil 11h, can be achieved based on zero coupling between the first planar coil 11a and the second planar coil 11b. The first planar coil 11a, the second planar coil 11b, and the eighth planar coil 11h each provide a magnetic field perpendicular to their respective coil planes, forming three nearly orthogonal, independently controllable magnetic fields near the wireless charging transmitter. Figure 9cAs shown, the eighth planar coil 11h is positioned near the longitudinal center point O of the first planar coil 11a and the second planar coil 11b. At this time, the magnetic fields generated by the three transmitting coils maintain an orthogonal relationship near the wireless charging transmitter, and are relatively... Figure 9b The structure shown has a larger magnetic field range that maintains the orthogonal relationship, thus ensuring better coupling with the terminal device 300 (such as a mobile phone) placed above the wireless charging transmitter, while also satisfying the 360° wireless charging coverage around the desktop 400.

[0112] In some embodiments, the outer diameter of the eighth planar coil 11h is larger than the outer diameter of the first planar coil 11a and the outer diameter of the second planar coil 11b. For example... Figure 9d As shown, the eighth planar coil 11h is in Figure 9b While maintaining the same center position, the coil is enlarged proportionally along the eighth plane. Since the center line of the eighth plane coil 11h still coincides with the center lines of the vertically placed first plane coil 11a and second plane coil 11b (i.e., the orthogonal intersection lines), they maintain zero coupling. The benefits of the enlarged eighth plane coil 11h are twofold: firstly, it extends the coverage of the longitudinal magnetic field perpendicular to the desktop 400, thereby increasing the wireless charging distance around the transmitting coil group 11; secondly, the extended planar coil also better supports the user's long-cultivated habit of placing the terminal device 300 (such as a mobile phone) flat on the charging pad.

[0113] Figures 9a-9d While the desktop multi-coil wireless charging transmitter in the design meets the basic requirements for multi-coil collaborative operation, such as orthogonal magnetic fields and zero coupling, further optimization is possible in practical applications regarding the wireless charging distance. Figures 9a-9d The factor affecting the wireless charging distance in a multi-coil structure is the distance between the coil center and the transmitter surface. If the outer shell 14 of the multi-coil transmitter is selected as a cylindrical or cuboid structure according to the outer contour of the coil structure, the closest distance that the user's wireless charging device can reach to the center of the transmitter coil is half the coil width during application. This distance greatly reduces the coupling strength between the transmitter coil and the coil in the receiver device. Therefore, in order to optimize the desktop multi-coil transmitter structure and achieve higher spatial freedom in wireless charging when multiple coils work together, in some embodiments, the at least two transmitter coils include three curved coils, which together form a rotating body structure. Along the circumference of the rotating body structure, any two adjacent curved coils partially overlap. In some embodiments, such as Figure 10aAs shown, the rotating body structure is a cylindrical structure, and the three curved coils are arranged in an array around the axis of the cylindrical structure. The three curved coils can be a first curved coil 11i, a second curved coil 11j, and a third curved coil 11k. This coil arrangement allows the transmitting coil to be as close as possible to the outer shell 14 of the transmitting end, thereby minimizing the distance between the transmitting coil group 11 and the terminal device 300, thus obtaining stronger coupling with the receiving coil 21. The structure and size of each transmitting coil in the figure are similar, and when unfolded into a planar coil, it forms a similar rectangular structure. Each transmitting coil can include a one-turn or multi-turn coil structure wound in the same direction. In this figure and the structural diagrams of the following embodiments, the multi-turn coil structure is represented by the outer contour of the multi-turn coil. Figure 10b As shown, three curved transmitting coils are arranged equidistantly along the outer perimeter of a cylinder. The normal vector directions of the centers of their respective coil surfaces are shown as n1, n2, and n3 in the figure. It can be noted that any two normal vector directions form an angle θ1, which is approximately 120°. The angle of the cylindrical surface covered by the length of each coil, as shown by angle θ2 in the figure, exceeds 120°, and can be 168°. This also means that there is a nearly equal overlap between any two of the three curved transmitting coils, and the angle of the overlapping portion on the cylindrical surface is represented by angle θ3 in the figure. As shown in the top view, the included angle θ3 of the overlapping portion can be 48°. The specific selection of angles θ2 and θ3 needs to be determined based on the specific design of each coil, but the goal is to achieve zero coupling between any two of the three transmitting coils.

[0114] like Figure 10c As shown in the figure, the magnetic field distribution generated by the three curved coils under in-phase current excitation is as follows. The magnetic field generated by the first curved coil 11i is the H magnetic field, the magnetic field generated by the second curved coil 11j is the I magnetic field, and the magnetic field generated by the third curved coil 11k is the J magnetic field. Taking the second curved coil 11j as an example, it can be seen from the figure that the I magnetic field passes through the surface where the third curved coil 11k is located from the outside to the inside in most areas. However, due to the partial overlap between the second curved coil 11j and the third curved coil 11k (… Figure 10bIn the region defined by angle θ3, the magnetic field I generated by the second surface coil 11j passes through the surface containing the third surface coil 11k in the opposite direction from the inside out. The area of ​​the I magnetic field from the outside in is large, but because it is far from the second surface coil 11j, its magnetic field strength is relatively low, and the magnetic flux it generates within the third surface coil 11k is not high. Conversely, the area of ​​the I magnetic field passing through the third surface coil 11k from the inside out is small, but because the magnetic field is strongest near the winding of the second surface coil 11j, the total magnetic flux of the magnetic field from the inside out within the third surface coil 11k is not low. In a specific case of overlapping angle θ3 between the surface coils, the magnetic flux generated by the second surface coil 11j on the third surface coil 11k from the outside in and from the inside out are equal and cancel each other out, thus achieving zero coupling between the second surface coil 11j and the third surface coil 11k. Similarly, in this three-curved coil transmitter system, a set of θ3 angle values ​​for the partially overlapping portions of the coils can be found, such that the coupling between any two coils is zero. Since the magnetic fields generated by the three curved transmitting coils are not parallel (the directions of the magnetic fields generated by the three curved transmitting coils are close to 120°, meaning they can generate independently controllable orthogonal magnetic field components), and the coupling between any two transmitting coils is zero, as described above, two or three transmitting coils can be simultaneously driven to work together to power the terminal device 300.

[0115] The structural design of the three curved coils allows the coupling coefficient between each transmitting coil to be less than a preset threshold, or even achieve zero coupling, thereby improving wireless power transmission efficiency. Simultaneously, because the three curved coils are uniformly placed along the cylindrical surface, the resulting spatial magnetic field can find suitable combinations around the cylinder, achieving 360° coverage of the receiving device for wireless charging along the surface of the curved coils. Combined with multi-channel transmitting circuitry, the system can adjust the direction of the magnetic field near the receiving device to achieve a longer wireless charging distance and support for a wider range of receiving device placement orientations compared to using a single coil.

[0116] In some embodiments, Figure 10aBased on the transmitting coil structure shown, more spatial orientations of the terminal device 300 can be supported by adding orthogonal coils. The at least two transmitting coils also include a ninth planar coil 11l. The plane in which the ninth planar coil 11l is located is the ninth plane, which is orthogonal to the axis of the rotating body structure, and the center of the ninth planar coil 11l is located on the axis of the rotating body structure. The ninth planar coil 11l can move up and down along the axis of the rotating body structure, but it is always orthogonal to the rotating body structure. In some embodiments, the horizontal center lines of the first curved surface coil 11i, the second curved surface coil 11j, and the third curved surface coil 11k are all located on the ninth plane, and the structure of each coil in the wireless charging transmitter is as follows: Figure 11a As shown.

[0117] The magnetic field K produced by the ninth planar coil 11l is as follows Figure 11b As shown, since the ninth planar coil 11l is placed along the horizontal centerline of each curved coil, the total magnetic flux K generated by the current on it passing through any one of the vertical curved coils is zero. Only one curved coil is shown in the figure. As mentioned above, the combination of the three curved coils can work together to provide any magnetic field component along the direction of the desktop 400 (i.e., parallel to the ninth plane). Combined with the longitudinal magnetic field component perpendicular to the desktop 400 (i.e., perpendicular to the ninth plane) generated by the ninth planar coil 11l, four independently controllable magnetic fields covering three orthogonal directions of the rectangular coordinate system can be formed near the transmitting coil group. In this embodiment of the invention, the four transmitting coil system can be placed inside an approximately cylindrical shell on the desktop 400. Regardless of whether the user moves the wireless charging mobile phone into the wireless charging range of the wireless charging transmitter from any angle around the desktop 400 (including placing the mobile phone on the top surface of the shell 14), the coupling coefficient of the four transmitting coils of the wireless charging transmitter can be less than a preset threshold, or even zero coupling. Therefore, efficient wireless charging of the mobile phone can be achieved.

[0118] In some embodiments, the ninth planar coil 11l can adopt various configurations that are orthogonal to and have zero coupling with the magnetic field of the vertically placed curved coil, thereby deriving various four-emitting coil transmitting end structures. For example... Figure 11cAs shown, the ninth planar coil 11l includes an inner sub-coil 11l1 and an outer sub-coil 11l2 connected in series. The centers of the inner sub-coil 11l1 and the outer sub-coil 11l2 are both located on the axis of the rotating structure (a cylindrical structure in this figure). The diameter of the inner sub-coil 11l1 is smaller than the diameter of the rotating structure, and the diameter of the outer sub-coil 11l2 is larger than the diameter of the cylindrical structure. The winding directions of the inner and outer sub-coils 11l2 are opposite. The inner sub-coil 11l1 is located inside the rotating structure, while the outer sub-coil 11l2 is located outside the rotating structure. Both the inner sub-coil 11l1 and the outer sub-coil 11l2 are circular structures, with the centers of both located on the axis of the rotating structure. Figure 11d As shown, when the ninth planar coil 11l is working, the current on it can first flow counterclockwise through the outer sub-coil 11l2, then flow to the inner sub-coil 11l1, and finally return to the outer sub-coil 11l2 in a clockwise direction to form a loop. The direction of the current is shown by the arrow in the figure. The magnetic field formed by such a current is as follows: Figure 11d , 11e As shown, the formed magnetic field L is divided into two parts: magnetic field L1, which is inserted vertically into the ninth plane within the inner sub-coil 11l1; and magnetic field L2, which exits the ninth plane vertically between the inner sub-coil 11l1 and the outer sub-coil 11l2. By controlling the relationship between the coil radii of the inner sub-coil 11l1 and the outer sub-coil 11l2 and the radius of the cylinder surface, the magnetic field L can be kept vertical on the cylinder surface, i.e., tangent to the cylinder surface. Thus, as... Figure 11e As shown, the magnetic flux L generated by the ninth planar coil 11l through each vertically placed curved surface coil is zero, thus achieving zero coupling between the ninth planar coil 11l and the three vertically placed curved surface coils. Compared to Figure 11a The four-emitting coil structure in the design offers several advantages. Firstly, it extends the coverage of the longitudinal magnetic field perpendicular to the desktop 400, thereby increasing the wireless charging distance in the space surrounding the coil group. Secondly, the extended planar coil can also better support the user's long-cultivated habit of placing the terminal device 300 (such as a mobile phone) flat on the charging pad for wireless charging.

[0119] In some embodiments, the rotating structure is a frustum structure, and the three curved coils are arranged in an array around the axis of the frustum structure. By tilting the curved coils, a magnetic field component perpendicular to the tabletop 40° is added to the transmitting system, thereby better supporting various orientations of the receiving device. Figure 12aAs shown, the first curved surface coil 11i, the second curved surface coil 11j, and the third curved surface coil 11k are all inclined curved surface coils. They form a frustum structure in space and can be placed inside a frustum-shaped outer shell 14. This coil arrangement also allows the transmitting coil group 11 to be as close as possible to the outer shell 14 of the transmitting end (not shown in the figure), thereby minimizing the distance between the transmitting coil and the terminal device 300 (such as a mobile phone), and thus obtaining stronger coupling with the receiving end coil 21. The structure and size of each inclined curved surface coil in the figure are similar, and the outer contour of the coil unfolded into a planar structure can be rectangular.

[0120] like Figure 12b As shown in the top view, the three transmitting coils are equidistantly arranged along the surface of a frustum. The directions of the normal vectors n1, n2, and n3 at the center of their respective coil surfaces are shown in the figure. It can be noted that the normal directions of the centers of any two coil surfaces in the three inclined coils form an angle θ4, which is close to 120°. The angle of the frustum surface covered by the length of each coil is shown as angle θ5 in the figure, and angle θ5 exceeds 120°, meaning that there is nearly equal overlap between any two inclined coils in the three transmitting coils. As mentioned earlier, zero coupling between any two of the three transmitting coils can be achieved by controlling the angle θ5 and the size of the overlap in the three-coil structure, depending on the specific design of the transmitting coils. Since the magnetic fields generated by the three transmitting coils form an angle of nearly 120° with each other and the coupling between any two transmitting coils is zero, as mentioned earlier, with the help of a multi-channel transmitting circuit unit, this system can achieve a greater degree of freedom in wireless charging space for terminal devices (such as mobile phones) around the transmitting end.

[0121] The magnetic field M produced by one of the three inclined surface coils is as follows: Figure 12c As shown, since each inclined curved coil is placed along the housing 14, which has a frustum structure and forms an acute angle with the tabletop 400, the magnetic field M generated by the inclined curved coil during operation is perpendicular to the curved surface of the coil and forms a certain angle with the tabletop 400. This provides the wireless charging transmitter with a magnetic field component perpendicular to the tabletop 400. The presence of this vertical magnetic field component helps the transmitter support the receiving device to achieve wireless charging in more spatial orientations. Another advantage of the inclined curved coil group and the frustum structure of the housing 14 is that it can well support the user's habit of resting the mobile phone on the wireless charging transmitter base for charging. In some embodiments, each inclined curved coil can be unfolded into a planar structure and form a fan-ring structure. This fan-ring structure coil group can also achieve mutual decoupling of the three transmitting coils by controlling the size of the overlapping part between the coils, thereby improving the wireless power transmission efficiency.

[0122] In some embodiments, based on the three tilted surface coils, more spatial orientations of the terminal device 300 can be supported by adding orthogonal coils, and zero coupling can be achieved between the various transmitting coils. Specifically, the structure of the three tilted surface coils and the ninth planar coil 11l can be as follows: Figure 13a As shown. The magnetic field generated by any inclined curved surface coil and the structure of the ninth planar coil 11l are as follows. Figure 13b As shown, the frustum structure includes a generatrix and a lower base, and the angle between any radius on the lower base and the generatrix is ​​θ. The distance between the ninth plane and the center plane of the frustum structure is δ2, and the included angle The distance δ2 satisfies the second preset relationship. If Figure 13b The image shows the fourth curved surface coil 11i. Therefore, the angle between the surface containing the fourth curved surface coil 11i and the tabletop is 40°. Should It is an acute angle. As long as the included angle is... The distance δ2 satisfies the second preset relationship, and the total magnetic flux L of the magnetic field L generated by the fourth curved surface coil 11i passing through the ninth planar coil 11l is zero. Furthermore, this coil arrangement allows for zero coupling between any one of the inclined curved surface coils and the ninth planar coil 11l while maintaining zero coupling between each inclined curved surface coil. In some embodiments, as the included angle... As the angle decreases, the distance δ2 gradually increases; for example, the included angle... When the distance δ2 is any value between [15°-90°), the ratio of the distance δ2 to the height of the frustum is any value between [50%-0).

[0123] As mentioned earlier, the combination of three inclined curved coils can work together to provide any magnetic field component along the direction of the desktop 400. Combined with the longitudinal magnetic field component perpendicular to the desktop 400 generated by the ninth planar coil 11l, four independently controllable magnetic fields covering three orthogonal directions of the rectangular coordinate system can be formed near the transmitting coil group. In this embodiment of the invention, the four transmitting coil system is placed inside a shell 14 (not shown in the figure) that is approximately a frustum of a cone, and placed on the desktop 400. No matter how the user moves the wirelessly charging mobile phone into the wireless charging range of the transmitting system from any angle around the desktop 400 (including placing the mobile phone on the top surface of the shell 14), the transmitting system can achieve efficient wireless charging of the mobile phone.

[0124] In some embodiments, Figure 13a The planar coil (i.e., the ninth planar coil 11l) in the four-coil transmitter array can adopt various configurations that are orthogonal and zero-coupled to the magnetic fields generated by the three inclined curved surface coils, thus deriving various four-coil transmitter array structures. Please refer to... Figure 13c It is similar to Figure 11c The structure, and Figure 11c The only structural difference is that the rotating body structure is a frustum structure, and the three curved surface coils are inclined curved surface coils. Other structural designs and the working principle for achieving zero coupling are the same. Figure 11c Similarly, I will not go into details here.

[0125] In some embodiments, the rotating body structure can also be a prism or a frustum. Other structural designs and the working principle for achieving zero coupling are similar to those for cylindrical and frustum structures, and will not be described in detail here.

[0126] Figures 7a-8c The combination of planar figure-eight coils described above can also be extended to curved coil structures to achieve zero coupling between transmitting coils. In some embodiments, the at least two transmitting coils include at least two tenth coils 11m, each of which includes a first part 11m1 and a second part 11m2. The first part 11m1 and the second part 11m2 have a first connecting part 11m3. The first part 11m1 and the second part 11m2 are symmetrical about the first connecting part 11m3, and the coil winding direction of the first part 11m1 is opposite to that of the coil winding direction of the second part 11m2. The first part 11m1 and the second part 11m2 of each tenth coil 11m are located on a first curved surface, and the first part 11m1 and the second part 11m2 of each tenth coil 11m are arranged in an array on the first curved surface. The first part 11m1, the second part 11m2, and the first connecting part 11m3 resemble a figure-eight structure, and the number of tenth coils 11m can be two or three. The first surface can be a sphere or a toroidal surface. When there are only two tenth coils (11m), such as... Figure 14a As shown, two tenth coils 11m are wound into a spherical structure. The first part 11m1, the second part 11m2, and the first connecting part 11m3 of each tenth coil 11m are all located on the sphere, and the first parts 11m1 and 11m2 of each of the two tenth coils are arrayed on the sphere, meaning the central symmetry planes of the two tenth coils are orthogonal. When there are only three tenth coils 11m, as... Figure 14b As shown, three tenth coils 11m are wound into a spherical structure, and the first part 11m1 and the second part 11m2 of each tenth coil 11m are arrayed on the spherical surface, with the two adjacent coils of the three tenth coils 11m partially overlapping.

[0127] In some embodiments, the first part 11m1 and the second part 11m2 of each tenth coil 11m can both be located on the annular surface, and the first connecting part 11m3 of each tenth coil 11m is located at the bottom of the plane of the annular surface.

[0128] In some embodiments, such as Figure 14c As shown, the first curved surface is a sphere, and the at least two transmitting coils further include an eleventh coil 11n, which is a ring coil. The eleventh coil 11n is disposed on the outer surface of the sphere, and its center is located on the axis of the sphere. The eleventh coil 11n may also be wound on the inner surface of the sphere.

[0129] In some embodiments, such as Figure 14d As shown, the first surface is an annular surface, and the at least two transmitting coils also include a twelfth plane coil 11o. The plane on which the twelfth plane coil 11o is located is the twelfth plane, which is a bottom surface of the annular surface. The center of the twelfth plane coil 11o is located on the axis of the annular surface, and the first connecting part 11m3 of each tenth coil 11m is located on the twelfth plane.

[0130] In some embodiments, Figure 14a and Figure 14b The structure can be achieved through a bowl-shaped design to charge the terminal device 300 inside the bowl. For example: Figure 14e As shown, the terminal device 300 (such as a mobile phone) can be placed freely in a "bowl"-shaped wireless charging transmitter composed of two transmitting coils, and its outer shell 14 is "bowl"-shaped. The wireless charging transmitter can control the current between multiple transmitting coils to achieve a suitable superimposed magnetic field for wireless charging, thus realizing efficient and highly flexible wireless charging.

[0131] In some embodiments, the spherical and toroidal surfaces can also be the side surfaces of structures such as prisms or frustums. Other structural designs and the working principle for achieving zero coupling are similar to those of spherical and toroidal surfaces, and will not be described in detail here. In summary, this wireless charging transmitter can not only provide current to the corresponding transmitting coils through multiple transmitting circuit units, with each transmitting coil generating a corresponding magnetic field, but also, when multiple transmitting coils work simultaneously, the magnetic fields generated by each transmitting coil together form a superimposed magnetic field, which then provides power to the receiving coil, improving wireless power transmission efficiency and resulting in better charging performance. Furthermore, various structural designs for the transmitting coil group can be used to ensure that the coupling coefficient between each transmitting coil is less than a preset threshold, reducing the coupling between multiple transmitting coils. This, in turn, reduces the circulating current between multiple transmitting circuits during wireless charging, reduces interference, and further improves power transmission efficiency.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; under the concept of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A wireless charging transmitter, comprising: The wireless charging transmitter includes: At least three transmitting coils and at least three transmitting circuit units. The transmitting coils and the transmitting circuit units correspond to each other one by one. The transmitting circuit units are used to supply current to the transmitting coils to drive the transmitting coils simultaneously. Among them, at least two of the at least three transmitting coils have the same structural shape, and the magnetic field directions generated by the currents on the at least three transmitting coils are not parallel to each other pairwise. At the same time, the coupling coefficient between the at least three transmitting coils is less than a preset threshold. The at least three transmitting coils include at least three "8-shaped" curved surface coils. The structural shapes and sizes of the at least three "8-shaped" curved surface coils are the same. Each "8-shaped" curved surface coil includes a first part (11m1), a second part (11m2), and a first connecting part (11m3) connecting the first part (11m1) and the second part (11m2). The first part (11m1) and the second part (11m2) are symmetric about the first connecting part (11m3), and the coil winding direction of the first part (11m1) is opposite to the coil winding direction of the second part (11m2). The first part (11m1) and the second part (11m2) of each "8-shaped" curved surface coil are located on a first curved surface, and the first parts (11m1) and the second parts (11m2) are arranged in an array on the first curved surface, and adjacent first parts (11m1) and / or second parts (11m2) partially overlap.

2. The wireless charging transmitter of claim 1, wherein, Except for the at least two transmitting coils, one of the at least three transmitting coils has the same structural shape as the at least two transmitting coils.

3. The wireless charging transmitter of claim 2, wherein, The at least three transmitting coils include at least three curved surface coils (11i, 11j, 11k). The structural shapes and sizes of the at least three curved surface coils (11i, 11j, 11k) are the same. The at least three curved surface coils (11i, 11j, 11k) jointly enclose a rotating body structure. Any two adjacent curved surface coils among the at least three curved surface coils (11i, 11j, 11k) partially overlap, and the at least three curved surface coils (11i, 11j, 11k) are arranged in an array along the circumferential direction of the rotating body structure around the axis of the rotating body structure. The rotating body structure is a cylindrical structure or a frustum-shaped structure.

4. The wireless charging transmitter of claim 1, wherein, The at least three transmitting coils include a first planar coil (11a), a second planar coil (11b), and a third planar coil (11h). The structural shapes of the first planar coil (11a), the second planar coil (11b), and the third planar coil (11h) are the same. The first planar coil (11a) and the second planar coil (11b) have the same size. The plane where the first planar coil (11a) is located is the first plane, the plane where the second planar coil (11b) is located is the second plane, the first plane and the second plane are orthogonal, and an orthogonal line (132) is formed at the intersection of the first plane and the second plane, and the orthogonal line coincides with the center line of the first planar coil (11a) and / or the center line of the second planar coil (11b); The plane where the third planar coil (11h) is located is the third plane, the third plane is respectively orthogonal to the first plane and the second plane, the center of the third planar coil (11h) is arranged on the orthogonal line (132), and the third planar coil (11h) is arranged on the same side of the first planar coil (11a) and the second planar coil (11b).

5. The wireless charging transmitter of claim 4, wherein, The third planar coil (11h) has different dimensions from the first planar coil (11a) and the second planar coil (11b), and the outer diameter of the third planar coil (11h) is larger than the outer diameters of the first planar coil (11a) and the second planar coil (11b).

6. A wireless charging transmitter, comprising: The wireless charging transmitter includes: At least three transmitting coils and at least three transmitting circuit units, the transmitting coils and the transmitting circuit units correspond to each other one by one, and the transmitting circuit units are used to provide current to the transmitting coils to drive the transmitting coils simultaneously; Among them, at least two of the at least three transmitting coils have the same structural shape, and the magnetic field directions generated by the currents on the at least three transmitting coils are not parallel to each other, and at the same time, the coupling coefficient between the at least three transmitting coils is less than a preset threshold; The structural shape of at least one of the at least three transmitting coils is different from that of the at least two transmitting coils having the same structural shape; The at least two transmitting coils include a first coil and a second coil, and the at least one transmitting coil includes a third coil; The first coil includes a first sub-coil and a second sub-coil, the winding direction of the first sub-coil is opposite to the winding direction of the second sub-coil, and the first sub-coil and the second sub-coil are in an "8"-shaped symmetric structure; The second coil includes a third sub-coil and a fourth sub-coil, the winding direction of the third sub-coil is opposite to the winding direction of the fourth sub-coil, and the third sub-coil and the fourth sub-coil are in an "8"-shaped symmetric structure; The center of the third coil is located on the center line of the first coil and / or the second coil.

7. The wireless charging transmitter of claim 6, wherein, The first coil (11d), the second coil (11e) and the third coil (11c) are all planar coils; The first coil (11d), the second coil (11e), and the third coil (11c) are arranged in parallel. The first coil (11d) is arranged orthogonally to the second coil (11e). The first sub-coil (11d1) and the second sub-coil (11d2) are symmetric about the center line of the third coil (11c). The third sub-coil (11e1) and the fourth sub-coil (11e2) are symmetric about the center line of the third coil (11c).

8. The wireless charging transmitter of claim 6, wherein, Both the first coil and the second coil are curved surface coils; The first sub-coil, the second sub-coil, the third sub-coil, and the fourth sub-coil are all located on the second curved surface, and the first sub-coil, the second sub-coil, the third sub-coil, and the fourth sub-coil are arranged in an array on the second curved surface; The center of the third coil is located on the axis of the second curved surface. 9.The wireless charging transmitter of claim 8, wherein, The third coil (11n) is an annular coil, and the second curved surface is a spherical curved surface; The third coil (11n) is arranged on the spherical curved surface.

10. The wireless charging transmitter of claim 8, wherein, The third coil (11o) is a planar coil, and the second curved surface is an annular curved surface; The plane where the third coil (11o) is located is a bottom surface of the annular curved surface.

11. A wireless charging transmitter, comprising: The wireless charging transmitter includes: At least three transmitting coils and at least three transmitting circuit units. The transmitting coils and the transmitting circuit units correspond to each other one by one. The transmitting circuit units are used to supply current to the transmitting coils to drive the transmitting coils simultaneously; Among them, the structural shapes of at least two of the at least three transmitting coils are the same, the magnetic field directions generated by the currents on the at least three transmitting coils are not parallel to each other pairwise, and the coupling coefficient between the at least three transmitting coils is less than a preset threshold; The structural shape of at least one of the at least three transmitting coils is different from the at least two transmitting coils with the same structural shape; The at least three transmitting coils further include a fourth coil. The structural shape and size of the fourth coil are the same as those of the at least two transmitting coils with the same structural shape. The fourth coil and the at least two transmitting coils overlap partially pairwise and are arranged in an array; The at least two transmitting coils include at least two "8"-shaped planar coils (11e, 11f). The fourth coil is an "8"-shaped planar coil (11g). The at least two "8"-shaped planar coils (11e, 11f) are arranged in parallel with the fourth coil (11g). Any two adjacent coils among the at least two "8"-shaped planar coils (11e, 11f) and the fourth coil (11g) overlap partially, and the at least two "8"-shaped planar coils (11e, 11f) and the fourth coil (11g) are arranged in an array. Each of the "8"-shaped planar coils (11e, 11f, 11g) includes two sub-coils (11e1, 11e2, 11f1, 11f2, 11g1, 11g2). The winding directions of the two sub-coils are opposite, and they are in an "8"-shaped symmetric structure; The at least one transmitting coil includes a third coil (11c), the third coil (11c) being a planar coil, and the two sub-coils in each of the "8"-shaped planar coils (11e, 11f, 11g) being symmetric about the center line of the third coil (11c).

12. A wireless charging transmitter, comprising: The wireless charging transmitter includes: At least three transmitting coils and at least three transmitting circuit units, the transmitting coils corresponding to the transmitting circuit units one by one, the transmitting circuit units being configured to supply current to the transmitting coils to drive the transmitting coils simultaneously; Wherein, at least two of the at least three transmitting coils have the same structural shape, and the magnetic field directions generated by the currents on the at least three transmitting coils are not parallel to each other pairwise, and the coupling coefficient between the at least three transmitting coils is less than a preset threshold; The structural shape of at least one of the at least three transmitting coils is different from that of the at least two transmitting coils having the same structural shape; The at least three transmitting coils further include a fourth coil, the fourth coil having the same structural shape and size as the at least two transmitting coils having the same structural shape, and the fourth coil and the at least two transmitting coils overlapping partially pairwise and being arranged in an array; The at least two transmitting coils include at least two curved surface coils (11i, 11j), the fourth coil being a curved surface coil (11k), the at least two curved surface coils (11i, 11j) and the fourth coil (11k) jointly enclosing a rotary body structure, any two adjacent curved surface coils among the at least two curved surface coils (11i, 11j) and the fourth coil (11k) overlapping partially, and the at least two curved surface coils (11i, 11j) and the fourth coil (11k) being arranged in an array along the circumferential direction of the rotary body structure around the axis of the rotary body structure; The rotary body structure is a cylindrical structure or a frustum-shaped structure; The at least one transmitting coil includes a third coil (11l), the plane where the third coil (11l) is located being orthogonally arranged with respect to the axis of the rotary body structure, and the center of the third coil (11l) being located on the axis of the rotary body structure.

13. The wireless charging transmitter of claim 12, wherein, The third coil includes an inner sub-coil (11l1) and an outer sub-coil (11l2) connected in series, the centers of the inner sub-coil (11l1) and the outer sub-coil (11l2) both being arranged on the axis of the rotary body structure, the diameter of the inner sub-coil (11l1) being smaller than the diameter of the rotary body structure, the diameter of the outer sub-coil (11l2) being larger than the diameter of the rotary body structure, and the winding directions of the inner sub-coil (11l1) and the outer sub-coil (11l2) being opposite.

14. The wireless charging transmitter of claim 12, wherein, When the rotary body structure is a circular truncated cone structure, the circular truncated cone structure comprises a generatrix and a lower base, an angle between any radius on the lower base and the generatrix is , and a distance between a plane where the third coil (11l) is located and a central plane of the circular truncated cone structure is δ2, the distance δ2 gradually increases as the angle decreases.

15. The wireless charging transmitter of claim 14, wherein, The included angle When the distance δ2 is any value in the interval [15°-90°), the ratio of the distance δ2 to the height of the frustoconical structure is any value in the interval [50%-0).

16. A wireless charger, comprising: Comprising: The wireless charging transmitter according to any one of claims 1 - 15; And A housing for accommodating the wireless charging transmitter.

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