Modular wireless power transmission planar coupling structure and control method

Abstract

The invention discloses a planar coupling structure based on modular wireless power transmission and a control method thereof, and relates to the technical field of magnetic coupling type wireless power transmission. Through modular structure arrangement and coil space orientation design, three-dimensional controllability and adjustability of a magnetic field can be achieved, a magnetic gathering effect is achieved to improve transmission efficiency and anti-offset capacity, edge magnetic leakage can be actively inhibited, and therefore the wireless power transmission planar coupling structure which is high in performance, high in flexibility and easy to maintain is formed.

Description

Technical Field

[0001] This invention discloses a modular wireless power transfer planar coupling structure and control method, relating to the field of magnetically coupled wireless power transfer technology. Background Technology

[0002] Wireless power transfer (WPT) technology refers to the transmission of electrical energy using media such as electromagnetic fields, microwaves, and lasers. It has been hailed as a disruptive and revolutionary new power transmission technology in the field of new energy. WPT technology offers flexible electrical connection methods, solving power supply problems in situations where it is unsuitable or difficult to run wires. It simplifies connection methods and processes, avoiding the cumbersome process of traditional wired connections and the safety hazards caused by frequent plugging and unplugging. This results in safe, flexible, and reliable power supply, without generating contact sparks and unaffected by harsh environments. Therefore, WPT technology has been applied in fields such as medical electronic equipment, consumer electronic equipment, electric vehicles, and underwater applications.

[0003] Among them, the magnetic field coupling method for waveguide transmission (WPT) is highly feasible and is currently the main technical route and research focus of WPT. This technology uses a magnetic field as a medium, has a wide power transmission coverage range, reaching up to megawatts, with an efficiency of over 95%, and a transmission distance from a few centimeters to several meters. The primary and secondary sides of the magnetic field coupling WPT use coils as the magnetic field coupling mechanism, with planar coupling mechanisms being widely used due to their small axial dimensions. However, because magnetically coupled WPTs are essentially loosely coupled structures, the magnetic field is not concentrated and there is significant leakage magnetic field at the edges. Furthermore, the system performance is quite sensitive to the relative position of the coupling mechanism. Ideally, the centers of the primary and secondary coils should be parallel and at a constant distance. However, in practical use, the primary and secondary coils are prone to misalignment, including lateral, longitudinal, distance, and angular deviations. Misalignment of the coupling coils reduces system stability, weakens power transmission capability, causes system circuit detuning, and increases energy loss, severely impacting the practicality of WPTs. Therefore, improving the misalignment resistance of magnetically coupled WPTs is an important research direction. Traditional misalignment resistance design of coupling coils aims to make the magnetic field of the primary coil more uniform to reduce fluctuations in system output power after misalignment. However, this will result in the loss of some magnetic field energy, leading to a loss of input power and efficiency. Summary of the Invention

[0004] This invention addresses the problems of existing technologies by providing a planar coupling structure based on modular wireless power transmission and its control method. The technical solution adopted is as follows: Firstly, a planar coupling structure based on modular wireless power transmission includes multiple magnetic field coil module groups; Each magnetic field coil module group includes at least one main magnetic field coil module, and a first type of auxiliary magnetic field coil module and a second type of auxiliary magnetic field coil module are sequentially arranged around the main magnetic field coil module; wherein: The main magnetic field coil module includes a coil winding, the coil plane of which is parallel to the plane of the coupling structure; The first type of auxiliary magnetic field coil module includes a first coil winding and a second coil winding that are independent of each other; the coil plane of the first coil winding is parallel to the plane of the coupling structure, and the coil plane of the second coil winding is perpendicular to the plane of the coupling structure; The second type of auxiliary magnetic field coil module includes two coil windings, the coil planes of which are parallel to the plane of the coupling structure.

[0005] In some implementations, in the first type of auxiliary magnetic field coil module, the coil plane of the first coil winding is configured such that its normal direction points to the geometric center of the coupling structure.

[0006] In some implementations, in the second type of auxiliary magnetic field coil module, the two coil windings are configured such that their coil planes are coplanar and the winding current directions are opposite.

[0007] Secondly, embodiments of the present invention provide a control method for a planar coupling structure based on modular wireless power transmission. The control method includes generating a main magnetic field perpendicular to the plane of the coupling structure by means of an excitation current, according to the coil winding of the main magnetic field coil module. The coupling structure includes multiple magnetic field coil module groups, each module group having the coupling structure described in the first aspect.

[0008] Based on the coil windings of the main magnetic field coil module, a main magnetic field perpendicular to the plane of the coupling structure is generated by an excitation current.

[0009] Some implementations also include: Based on the second coil winding in the first type of auxiliary magnetic field coil module whose coil plane is perpendicular to the coupling structure plane, a controllable current is applied to make the second coil winding generate a magnetic field component whose axis is in the coupling structure plane and points to the geometric center of the plane.

[0010] In some implementations, the strength and direction of the magnetic field component are adjusted by regulating the amplitude and phase of the controllable current, based on the change in transmission distance of the planar coupling structure. Based on the lateral offset between the transmitter and receiver of the planar coupling structure, the intensity and direction of the magnetic field component are adjusted by regulating the amplitude and phase of the controllable current.

[0011] Some implementations also include: Based on the two coil windings of the second type of auxiliary magnetic field coil module, by applying currents in opposite directions, the magnetic flux of the magnetic fields generated by the two windings cancels each other out in the edge region of the coupling structure.

[0012] Some implementations also include: According to the preset magnetic field distribution target, by applying independent current excitation, the windings of the main magnetic field coil module, the windings of the first type of auxiliary magnetic field coil module, and the second type of auxiliary magnetic field coil module together form a three-dimensional spatially distributed synthetic magnetic field.

[0013] Thirdly, embodiments of the present invention provide an electronic device, including a memory and a processor, wherein the memory is used to store one or more computer instructions, wherein when the one or more computer instructions are executed by the processor, the control method described in the second aspect above is implemented.

[0014] Fourthly, embodiments of the present invention provide a computer storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, it implements the control method as described in the second aspect.

[0015] One or more embodiments of the present invention can bring at least the following beneficial effects: The structure of this invention, through modular design, (1) reduces the manufacturing, maintenance, and repair costs of large-scale wireless power transmission systems; (2) increases system flexibility, facilitating expansion based on installation dimensions, capacity, etc.; (3) possesses a unique magnetic focusing effect, resulting in high system efficiency; (4) can actively shield, minimizing magnetic leakage; and (5) allows for mutual coordination among modules, providing flexible control methods. The wireless power transmission coupling system composed of these modules possesses three-dimensional controllable and adjustable magnetic field, controllable magnetic focusing point, and active reduction of edge magnetic leakage. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a planar coupling structure based on modular wireless power transmission provided in an embodiment of the present invention, wherein... Figure 1 (a) is a schematic diagram of the energy transfer coupling structure based on a three-degree-of-freedom magnetic field module. Figure 1(b) is a schematic diagram of the energy transfer coupling structure based on a four-degree-of-freedom magnetic field module; Figure 2 This is a schematic diagram of the main magnetic field coil module in a planar coupling structure based on modular wireless power transmission provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a first type of auxiliary magnetic field coil module in a planar coupling structure based on modular wireless power transmission provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the second type of auxiliary magnetic field coil module in a planar coupling structure based on modular wireless power transmission provided in an embodiment of the present invention. Attached image description: Main magnetic field coil module – 1; Type I auxiliary magnetic field coil module – 2; Type II auxiliary magnetic field coil module – 3. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] Example 1: Figure 1 A schematic diagram of the main magnetic field coil module in a planar coupled structure based on modular wireless power transfer is shown; the magnetic field has three degrees of freedom for adjustment, such as... Figure 1 As shown, the planar coupling structure based on modular wireless power transmission provided in this embodiment includes multiple magnetic field coil module groups; Each magnetic field coil module group includes a main magnetic field coil module 1, around which a first type of auxiliary magnetic field coil module 2 and a second type of auxiliary magnetic field coil module 3 are arranged in sequence. The number of each type of module can be configured according to specific application scenarios (such as power, size requirements, etc.), wherein at least one main magnetic field coil module 1 and at least one type of auxiliary magnetic field coil module are included.

[0021] The coil winding in each of the magnetic field coil modules can be specifically implemented as a planar helical coil (e.g., a PCB coil, a Litz wire wound coil, etc.), or it can be a coil with a magnetic core structure wound on the magnetic core. The magnetic core can be made of soft magnetic materials such as ferrite, amorphous, or nanocrystalline materials. Specifically, the main magnetic field coil module 1 is installed at the center of the entire coupling structure, the first type of auxiliary magnetic field coil module 2 is adjacent to and surrounds the main magnetic field coil module 1, and the second type of auxiliary magnetic field coil module 3 is located on the outer side, forming the outermost layer of the coupling structure.

[0022] Figure 2 This is a schematic diagram of the structure of the main magnetic field coil module 1 provided in an embodiment of the present invention. Figure 2 As shown, the main magnetic field coil module 1 includes a coil winding, a magnetic core, and necessary fixing and insulation accessories (not all shown in the figure). The coil plane of the coil winding is parallel to the plane of the coupling structure. In this embodiment, this means that the direction of the magnetic field generated by the winding (i.e., its axial direction) is perpendicular to the plane of the coupling structure, forming the main magnetic field for energy transmission. The magnetic core is usually located on the side of the coil winding opposite to the energy transmission direction, used to guide and concentrate the magnetic lines of force.

[0023] Figure 3 This is a schematic diagram of the structure of the first type of auxiliary magnetic field coil module 2 provided in an embodiment of the present invention. Figure 3 As shown, the first type of auxiliary magnetic field coil module 2 includes a first coil winding and a second coil winding that are independent of each other, a magnetic core, and necessary accessories. The coil plane of the first coil winding is parallel to the plane of the coupling structure; while the coil plane of the second coil winding is perpendicular to the plane of the coupling structure. In some preferred embodiments, the coil plane of the first coil winding is configured such that its normal direction points towards the geometric center of the coupling structure to achieve a better magnetic field guiding effect. Figure 3 The image specifically shows the coil winding configuration in the horizontal direction (i.e., parallel to the plane of the coupling structure) of this module.

[0024] In some preferred embodiments, the plurality of first-type auxiliary magnetic field coil modules 2 are arranged in a ring array around the main magnetic field coil module 1, and the plurality of second-type auxiliary magnetic field coil modules 3 are also arranged in a ring array around the first-type auxiliary magnetic field coil module 2, thereby forming a symmetrical concentric ring structure, which is beneficial for forming a uniform and controllable circumferential magnetic field distribution.

[0025] Furthermore, inside the first type of auxiliary magnetic field coil module 2, the coil planes of its first coil winding and second coil winding are perpendicular to each other, that is, they are arranged orthogonally in space. This orthogonal structure is the physical basis for realizing independent vector control of the spatial magnetic field.

[0026] Figure 4 This is a schematic diagram of the structure of the second type of auxiliary magnetic field coil module 3 provided in an embodiment of the present invention. Figure 4 As shown, the second type of auxiliary magnetic field coil module 3 includes two coil windings, a magnetic core, and necessary accessories. The coil planes of both coil windings are parallel to the plane of the coupling structure. In some preferred embodiments, the two coil windings are configured such that their coil planes are coplanar, and are supplied with currents in opposite directions during actual operation. Figure 1 As indicated by the arrows, this configuration is designed to allow the magnetic fields generated to interact in the edge regions of the coupled structure, thereby reducing system leakage flux.

[0027] It should be noted that, for clarity, the accompanying drawings may not fully depict all accessories (such as mounting brackets, insulation layers, etc.), nor may they show the circuitry for powering or controlling each coil winding. However, these are all things that those skilled in the art would be able to recognize and configure when implementing this invention. The shapes, proportions, and relative positions of the modules shown in the figures are merely examples and not the sole limitation of this invention.

[0028] Through the specific modular structural arrangement and coil spatial orientation design described above, the structure of this invention can achieve three-dimensional controllability and adjustability of the magnetic field, has a magnetic focusing effect to improve transmission efficiency and anti-offset capability, and can actively suppress edge leakage magnetic field, thus forming a high-performance, highly flexible and easy-to-maintain planar coupling structure for wireless power transmission.

[0029] Example 2: Secondly, embodiments of the present invention provide a control method for a planar coupling structure based on modular wireless power transmission. The planar coupling structure includes multiple magnetic field coil module groups, each module group having the features described in the first aspect. The control method includes: Based on the coil windings of the main magnetic field coil module, a main magnetic field perpendicular to the plane of the coupling structure is generated by an excitation current.

[0030] Furthermore, it also includes: Based on the second coil winding in the first type of auxiliary magnetic field coil module whose coil plane is perpendicular to the coupling structure plane, a controllable current is applied to make the second coil winding generate a magnetic field component whose axis is in the coupling structure plane and points to the geometric center of the plane.

[0031] Furthermore, based on the change in transmission distance of the planar coupling structure, the intensity and direction of the magnetic field component are adjusted by regulating the amplitude and phase of the controllable current; Based on the lateral offset between the transmitter and receiver of the planar coupling structure, the intensity and direction of the magnetic field component are adjusted by regulating the amplitude and phase of the controllable current.

[0032] Furthermore, it also includes: Based on the two coil windings of the second type of auxiliary magnetic field coil module, by applying currents in opposite directions, the magnetic flux of the magnetic fields generated by the two windings cancels each other out in the edge region of the coupling structure.

[0033] Furthermore, it also includes: According to the preset magnetic field distribution target, by applying independent current excitation, the windings of the main magnetic field coil module, the windings of the first type of auxiliary magnetic field coil module, and the second type of auxiliary magnetic field coil module together form a three-dimensional spatially distributed synthetic magnetic field.

[0034] Example 3: This embodiment also provides an electronic device, including a memory and a processor, wherein the memory is used to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement the method of Embodiment 2; In practical applications, the processor can be implemented as an Application Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), controller, microcontroller unit (MCU), microprocessor, or other electronic components to execute the methods described in the above embodiments.

[0035] The method implemented in this embodiment is as shown in Embodiment 2.

[0036] Example 4: This embodiment also provides a computer storage medium, in which a computer program is stored, and when the computer program is executed by one or more processors, the method of embodiment two is implemented. The computer-readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0037] The method implemented in this embodiment is as shown in Embodiment 2.

[0038] In the several embodiments provided in this invention, it should be understood that the disclosed systems and methods can also be implemented in other ways. The system and method embodiments described above are merely illustrative.

[0039] It should be noted that, in this document, the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A modular wireless power transfer planar coupling structure, characterized in that, Includes multiple magnetic field coil module groups; Each magnetic field coil module group includes at least one main magnetic field coil module, and a first type of auxiliary magnetic field coil module and a second type of auxiliary magnetic field coil module are sequentially arranged around the main magnetic field coil module; wherein: The main magnetic field coil module includes a coil winding, the coil plane of which is parallel to the plane of the coupling structure; The first type of auxiliary magnetic field coil module includes a first coil winding and a second coil winding that are independent of each other; the coil plane of the first coil winding is parallel to the plane of the coupling structure, and the coil plane of the second coil winding is perpendicular to the plane of the coupling structure; The second type of auxiliary magnetic field coil module includes two coil windings, the coil planes of which are parallel to the plane of the coupling structure.

2. The coupling structure according to claim 1, characterized in that, In the first type of auxiliary magnetic field coil module, the coil plane of the first coil winding is configured such that its normal direction points to the geometric center of the coupling structure.

3. The coupling structure according to claim 1, characterized in that, In the second type of auxiliary magnetic field coil module, the two coil windings are configured such that their coil planes are coplanar and the winding current directions are opposite.

4. A control method based on a planar coupled structure for modular wireless power transfer, characterized in that, The control method includes generating a main magnetic field perpendicular to the plane of the coupling structure by means of an excitation current, based on the coil winding of the main magnetic field coil module. The coupling structure includes multiple magnetic field coil module groups, each module group having the coupling structure described in any one of claims 1-3.

5. The control method according to claim 4, characterized in that, Also includes: Based on the second coil winding in the first type of auxiliary magnetic field coil module whose coil plane is perpendicular to the coupling structure plane, a controllable current is applied to make the second coil winding generate a magnetic field component whose axis is in the coupling structure plane and points to the geometric center of the plane.

6. The control method according to claim 5, characterized in that, Based on the change in transmission distance of the planar coupling structure, the intensity and direction of the magnetic field component are adjusted by regulating the amplitude and phase of the controllable current; Based on the lateral offset between the transmitter and receiver of the planar coupling structure, the intensity and direction of the magnetic field component are adjusted by regulating the amplitude and phase of the controllable current.

7. The control method according to claim 4, characterized in that, Also includes: Based on the two coil windings of the second type of auxiliary magnetic field coil module, by applying currents in opposite directions, the magnetic flux of the magnetic fields generated by the two windings cancels each other out in the edge region of the coupling structure.

8. The control method according to claim 4, characterized in that, Also includes: According to the preset magnetic field distribution target, by applying independent current excitation, the windings of the main magnetic field coil module, the windings of the first type of auxiliary magnetic field coil module, and the second type of auxiliary magnetic field coil module together form a three-dimensional spatially distributed synthetic magnetic field.

9. An electronic device, characterized in that, It includes a memory and a processor, the memory being used to store one or more computer instructions, wherein the one or more computer instructions, when executed by the processor, implement the control method as described in any one of claims 4-8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, is used to implement the control method as described in any one of claims 4-8.

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