Multi-degree-of-freedom magnetic field emission structure based on two-dimensional magnetic coupling coil and optimization method thereof

Abstract

The invention discloses a multi-degree-of-freedom magnetic field emission structure based on a two-dimensional magnetic coupling coil and an optimization method thereof, and particularly relates to the technical field of magnetic coupling resonance, and the structure comprises a third emission coil, and a first emission coil group and a second emission coil group which are arranged in a circumferential array manner about the axis of the third emission coil. The third transmitting coil is specifically of a cross-shaped frame structure, the four top ends of the third transmitting coil are rounded corner ends, and the adjacent included angles are rounded corner concave parts. The second transmitting coil group and the first transmitting coil group are both composed of side wing transmitting coils with the same specification; the side wing transmitting coil is divided into an arc-shaped frame part according to the structure. According to the invention, three groups of transmitting coils respectively generate three-dimensional magnetic fields, and then a three-dimensional synthetic magnetic field is generated by controlling coil excitation, so that the size and the installation difficulty of a transmitting mechanism are remarkably reduced, and multi-degree-of-freedom wireless power transmission can be realized through a three-dimensional rotating magnetic field control strategy.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic coupling resonance, and in particular to a multi-degree-of-freedom magnetic field emission structure based on a two-dimensional magnetic coupling coil and an optimization method thereof. Background Art

[0002] Magnetic coupling resonant wireless power transmission is a method of achieving wireless power transmission by coupling the magnetic field between the resonant coils through the resonance of two or more resonant coils with the same resonant frequency.

[0003] Reference publication (announcement) number: CN103475109B, publication (announcement) date: 2017-01-04, a magnetically coupled resonant wireless power transmission device is disclosed, comprising: a high-frequency power amplifier module; a resonant system connected to the output end of the high-frequency power amplifier module; a rectifier module connected to the output end of the resonant system; a constant resistance DC conversion module whose input end is connected to the output end of the rectifier module and whose output end is connected to an electrical device, wherein the input impedance of the constant resistance DC conversion module is conjugate matched with the output impedance of the high-frequency power amplifier module; a feedback controller connected to the resonant system, and when the phases of the input voltage and input current of the resonant system are different, the capacitance of the resonant capacitor corresponding to the transmitting coil in the resonant system is adjusted until the phases of the input voltage and input current are the same, so as to achieve automatic tracking of the maximum transmission efficiency of electric energy under the premise of reducing the control difficulty of the feedback controller and simplifying the complexity of its program design.

[0004] For example, the publication (announcement) number is CN117977830A, the publication (announcement) date is 2024-05-03, and a magnetically coupled resonant wireless power transmission system includes a transmitting part and a receiving part. The transmitting part includes a power supply circuit, an oscillation circuit, a driving circuit and a transmitting coil; the receiving part includes a receiving coil, a rectifier circuit, and a voltage stabilizing circuit. The transmitting circuit includes a transmitting resonant coil and a transmitting circuit, and the receiving circuit includes a receiving circuit and a receiving resonant coil. The transmitting coil and the receiving coil are both LC circuits with the same inherent resonant frequency. When the driving signal frequency is the same as the inherent resonant frequency of the coil, the transmitting and receiving coils resonate, and coupling occurs between the two coils under the action of the magnetic field, thereby realizing wireless transmission of electric energy. Beneficial effects: Based on the principle of electromagnetic resonance coupling, the non-radiative magnetic field is used to realize efficient transmission of electric power, which has the advantages of high efficiency and long distance.

[0005] Among the above two prior art patents, magnetic coupling resonance wireless power transmission has outstanding advantages such as portability, high safety, and versatility, and is a very promising wireless power transmission technology. However, the three-dimensional emission structure of the magnetic field has large space volume, high installation difficulty, and limited application scenarios. Summary of the invention

[0006] The purpose of the present invention is to provide a multi-degree-of-freedom magnetic field emission structure based on a two-dimensional magnetic coupling coil and an optimization method thereof, so as to solve the above-mentioned problems.

[0007] In order to achieve the above object, the present invention provides the following technical solution: a multi-degree-of-freedom magnetic field transmitting structure based on a two-dimensional magnetic coupling coil, comprising a third transmitting coil and two groups of first transmitting coil groups and second transmitting coil groups respectively arranged in a circular array around the axis of the third transmitting coil, wherein:

[0008] The third transmitting coil is specifically a cross frame structure, and the four top ends are rounded ends, and the adjacent included angles are rounded concave parts;

[0009] The second transmitting coil group and the first transmitting coil group are both composed of side wing transmitting coils with the same specifications;

[0010] The side wing transmitting coil is divided into an arc-shaped frame part and a triangular protrusion part located inside the arc-shaped frame part and protruding to the rounded corner recessed part according to the structure;

[0011] The inner arc end of the arc-shaped frame portion is a barb portion, and the combination of the barb portions of two adjacent side wing transmitting coils is equal to the rounded end profile.

[0012] Preferably, the first transmitting coil group is arranged along the x-axis, the second transmitting coil group is arranged along the y-axis, and the third transmitting coil group is arranged along the z-axis.

[0013] Preferably, the directions of the magnetic fields generated by the first transmitting coil group and the second transmitting coil group are orthogonal.

[0014] Preferably, the inflow amount of the magnetic flux generated by the first transmitting coil group in the third transmitting coil is equal to the outflow amount.

[0015] An optimization method for a multi-degree-of-freedom magnetic field emission structure based on a two-dimensional magnetic coupling coil includes the multi-degree-of-freedom magnetic field emission structure based on a two-dimensional magnetic coupling coil described in the above scheme, and the optimization method includes:

[0016] S01. Set the desired transmitting coil parameters: input voltage U dc , system operating frequency f0, excitation current frequency f1 and coil size parameters;

[0017] S02. Set the defined receiving coil parameters: output power P o , load resistance R L 、Filter inductor L f and coil size parameters;

[0018] S03. According to the defined output power, in the initial posture, measure the mutual inductance and output power of the coupling mechanism, select the number of turns of the third transmitting coil that meets the expectation, and record the magnetic field intensity generated at the center point at this time;

[0019] S03, taking the magnetic field strength generated by the third transmitting coil as a reference value, synchronously adjusting the number of turns of the first transmitting coil group and the second transmitting coil group until the scalar value of the magnetic field strength generated at the center point of the receiving coil is equal, and defining the number of turns of the first transmitting coil group, the second transmitting coil group and the third transmitting coil group as reference values;

[0020] S04. When the value of the expected output of the receiving coil changes, the number of turns of the first transmitting coil group, the second transmitting coil group and the third transmitting coil can be adjusted synchronously and proportionally to obtain the corresponding required actual number of turns.

[0021] Preferably, the formula for measuring the output power in step S03 is as follows:

[0022]

[0023] In the above technical scheme, the present invention provides a multi-degree-of-freedom magnetic field transmitting structure based on a two-dimensional magnetic coupling coil and an optimization method thereof, which have the following beneficial effects: three groups of transmitting coils respectively generate three-dimensional magnetic fields, and then a three-dimensional synthetic magnetic field is generated by controlling the coil excitation, which significantly reduces the volume of the transmitting mechanism and the difficulty of installation, and through the three-dimensional rotating magnetic field control strategy, multi-degree-of-freedom wireless power transmission can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0025] Figure 1 A schematic diagram of the structure provided by an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of a magnetic field distribution diagram of a first embodiment provided by an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of the magnetic field distribution diagram structure of a second embodiment provided by the embodiment of the present invention;

[0028] Figure 4 A schematic diagram of the magnetic field distribution diagram structure of a third embodiment provided by the embodiment of the present invention;

[0029] Figure 5A schematic diagram of a circuit structure provided by an embodiment of the present invention;

[0030] Figure 6 A flowchart provided for an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. First transmitting coil group; 2. Second transmitting coil group; 3. Third transmitting coil; 31. Rounded end; 32. Rounded recessed portion; 100. Arc-shaped frame portion; 101. Triangular raised portion; 102. Barb portion. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] Embodiment 1

[0035] like Figure 1 and Figure 3 As shown, a multi-degree-of-freedom magnetic field transmitting structure based on a two-dimensional magnetic coupling coil comprises a third transmitting coil 3 and two groups of first transmitting coil groups 1 and second transmitting coil groups 2 respectively arranged in a circular array around the axis of the third transmitting coil 3, wherein:

[0036] The third transmitting coil 3 is specifically a cross frame structure, and the four top ends are rounded ends 31, and the adjacent included angles are rounded recessed portions 32. This design helps to optimize the distribution of the magnetic field and the performance of the coil.

[0037] Both the first transmitting coil group 1 and the second transmitting coil group 2 are composed of wing transmitting coils with the same specifications.

[0038] Each wing transmitting coil has the following structure: an arc-shaped frame portion 100: This is the main structural part of the coil, and its inner arc end has a barb portion 102. The design of the barb portion 102 makes the barb portions of two adjacent wing transmitting coils form a profile that matches the rounded end 31.

[0039] The triangular protrusion 101 is located inside the arc-shaped frame portion 100 and protrudes to the rounded recess 32. This protrusion design helps to better fit and position the coil, ensuring the uniformity of the magnetic field and the stability of the coil.

[0040] Furthermore, the first transmitting coil group 1 is arranged along the x-axis, the second transmitting coil group 2 is arranged along the y-axis, and the third transmitting coil group 3 is arranged along the z-axis. Such an arrangement makes the magnetic field of the system have good directivity and uniformity in three-dimensional space.

[0041] The magnetic field directions generated by the first transmitting coil group 1 and the second transmitting coil group 2 are orthogonal, which means that their magnetic field directions in space are perpendicular to each other. This orthogonal arrangement can effectively achieve magnetic field distribution in different directions.

[0042] The first transmitting coil group 1 is arranged along the x-axis, the second transmitting coil group 2 is arranged along the y-axis, and the third transmitting coil group 3 is arranged along the z-axis. Such an arrangement makes the magnetic field of the system have good directivity and uniformity in three-dimensional space.

[0043] The directions of the magnetic fields generated by the first transmitting coil group 1 and the second transmitting coil group 2 are orthogonal, which means that their magnetic field directions in space are perpendicular to each other. This orthogonal arrangement can effectively achieve magnetic field distribution in different directions.

[0044] Furthermore, the inflow amount of the magnetic flux generated by the first transmitting coil group 1 in the third transmitting coil 3 is equal to the outflow amount. Then the first transmitting coil group 1 and the third transmitting coil 3 are decoupled from each other, and at this time, the second transmitting coil group 2 and the third transmitting coil 3 are also decoupled from each other.

[0045] Embodiment 2

[0046] This embodiment describes the change of the magnetic field between the first transmitting coil group 1, the second transmitting coil group 2 and the third transmitting coil group 3 based on the angular relationship between the three transmitting coil groups in a plane:

[0047] combine Figure 2 As shown, the first transmitting coil group 1 and the second transmitting coil group 2 are responsible for generating magnetic fields parallel to the transmitting structure direction, and the two magnetic field directions are perpendicular to each other, forming a rectangular coordinate system in a two-dimensional plane. The third transmitting coil 3 is responsible for generating a magnetic field perpendicular to this plane, thereby constructing a complete three-dimensional rectangular coordinate system.

[0048] The cleverness of this design lies in that it utilizes the principle of vector synthesis, and by precisely modulating the excitation current of each coil, the direction of the synthetic magnetic field can be flexibly controlled. This flexibility allows the magnetic field to be precisely directed to the receiving coil whose position is constantly changing, thereby achieving efficient energy transmission and signal transmission.

[0049] In addition, the structure also features a high-occupancy coil arrangement, which means that a greater magnetic field strength can be generated per unit area. This feature is of great significance in practical applications because it can improve the efficiency and stability of energy transmission.

[0050] Through the control strategy of coil excitation, we can perform fine vector control on the synthetic magnetic field. This control capability is not limited to the two-dimensional plane, but extends to the three-dimensional space, thus realizing the conditions for multi-degree-of-freedom magnetic field generation. This provides more possibilities for magnetic field applications in various complex environments.

[0051] Combination Figure 3 , we can see the magnetic field distribution above the transmitting mechanism in different situations. When the rectangular coordinate system is rotated 45° counterclockwise as the reference coordinate system of the structure, it can be clearly seen that the magnetic field generated by the first transmitting coil group 1 is distributed along the x-axis, while the magnetic fields generated by the second transmitting coil group 2 and the third transmitting coil group 3 are distributed along the y and z-axis respectively. This distribution feature verifies that the structure does have the ability to generate a three-dimensional multi-degree-of-freedom magnetic field.

[0052] Furthermore, we demonstrate the superiority of this design from the perspective of magnetic field coupling. Figure 4 As shown, the coupling state of the three transmitting coils is naturally decoupled. Since the first transmitting coil group 1 and the second transmitting coil group 2 are designed to be perpendicular to each other, the directions of the magnetic fields they generate are also orthogonal, so the two coil groups are decoupled from each other. This means that they will not interfere with each other when working, thereby improving the stability and efficiency of the entire system.

[0053] At the same time, since the magnetic coupling structure is designed to be symmetrical along the x-axis, the inflow of the magnetic flux generated by the first transmitting coil group 1 in the third transmitting coil 3 is equal to the outflow, so the first transmitting coil group 1 and the third transmitting coil 3 are also decoupled from each other. Similarly, the second transmitting coil group 2 and the third transmitting coil 3 are also decoupled from each other. This natural decoupling state provides a strong guarantee for the efficient operation of the entire system.

[0054] In summary, the first transmitting coil group 1, the second transmitting coil group 2 and the third transmitting coil 3 realize the three-dimensional multi-degree-of-freedom magnetic field generation and natural decoupling through ingenious magnetic field design and control strategy. These characteristics enable it to perform well in various complex environments, bringing more possibilities and convenience to magnetic field applications.

[0055] Embodiment 3

[0056] This embodiment optimizes the multi-degree-of-freedom magnetic field emission structure based on the two-dimensional magnetic coupling coil in the magnetic field according to the first embodiment, and includes the following processing steps:

[0057] S01. Set the desired transmitting coil parameters: input voltage U dc , system operating frequency f0, excitation current frequency f1 and coil size parameters;

[0058] S02. Set the defined receiving coil parameters: output power Po , load resistance R L 、Filter inductor L f and coil size parameters;

[0059] S03. According to the defined output power, in the initial posture, measure the mutual inductance and output power of the coupling mechanism, select the number of turns of the third transmitting coil 3 that meets the expectation, and record the magnetic field intensity generated at the center point at this time;

[0060] S03, taking the magnetic field strength generated by the third transmitting coil 3 as a reference value, synchronously adjusting the number of turns of the first transmitting coil group 1 and the second transmitting coil group 2, until the scalar value of the magnetic field strength generated at the center point of the receiving coil is equal, and defining the number of turns of the first transmitting coil group 1, the second transmitting coil group 2 and the third transmitting coil 3 at this time as the reference value;

[0061] S04. When the value of the expected output of the receiving coil changes, the number of turns of the first transmitting coil group 1, the second transmitting coil group 2 and the third transmitting coil 3 can be adjusted synchronously and proportionally to obtain the corresponding required actual number of turns.

[0062] The formula for measuring the output power in step S03 is as follows:

[0063]

[0064] In summary, in order to achieve efficient wireless power transmission, we use three sets of transmitting coils, which are used to generate magnetic fields in three dimensions. Specifically, the first set of coils generates a magnetic field along the X-axis, the second set of coils generates a magnetic field along the Y-axis, and the third set of coils generates a magnetic field along the Z-axis. By precisely controlling the current of these three sets of coils, we can adjust the strength and direction of the magnetic field generated by each coil, thereby achieving precise adjustment of the three-dimensional synthetic magnetic field. Its main advantage is that it significantly reduces the size of the transmitting mechanism and simplifies the installation difficulty. Traditional wireless power transmission systems usually require complex mechanical structures to achieve magnetic field generation in different directions, while the three-dimensional magnetic field generation technology we use is electrically controlled rather than mechanically adjusted, which greatly reduces the complexity and cost of the system.

[0065] In addition, through the three-dimensional rotating magnetic field control strategy, we are able to perform wireless power transmission with multiple degrees of freedom. This means that the system can be adjusted and optimized in multiple directions, thereby improving the efficiency and flexibility of power transmission. Users can move freely between different spatial positions and angles without reconfiguring the system or making additional adjustments, which greatly enhances the adaptability of the system and user experience. By generating a three-dimensional magnetic field through three sets of transmitting coils and applying a three-dimensional rotating magnetic field control strategy, we not only optimized the volume and installation convenience of the wireless power transmission system, but also improved the system's multi-degree-of-freedom control capabilities, achieving more efficient and flexible power transmission.

[0066] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A multi-degree-of-freedom magnetic field emission structure based on a two-dimensional magnetic coupling coil, characterized in that: It comprises a third transmitting coil (3) and two groups of first transmitting coil groups (1) and second transmitting coil groups (2) respectively arranged in an array around the axis of the third transmitting coil (3), wherein: The third transmitting coil (3) is specifically a cross frame structure, and the four top ends are rounded ends (31), and the adjacent included angles are rounded recessed portions (32); The second transmitting coil group (2) and the first transmitting coil group (1) are both composed of side wing transmitting coils of the same specifications; The side wing transmitting coil is divided into an arc-shaped frame portion (100) and a triangular protrusion portion (101) located inside the arc-shaped frame portion (100) and protruding to the rounded recessed portion (32) according to the structure; The inner arc end of the arc-shaped frame portion (100) is a barb portion (102), and the combination of the barb portions (102) of two adjacent side-wing transmitting coils is equal to the profile of the rounded end (31).

2. The multi-degree-of-freedom magnetic field emission structure based on a two-dimensional magnetic coupling coil according to claim 1, characterized in that: The first transmitting coil group (1) is arranged along the x-axis, the second transmitting coil group (2) is arranged along the y-axis, and the third transmitting coil (3) is arranged along the z-axis.

3. The multi-degree-of-freedom magnetic field emission structure based on a two-dimensional magnetic coupling coil according to claim 1, characterized in that: The directions of the magnetic fields generated by the first transmitting coil group (1) and the second transmitting coil group (2) are orthogonal.

4. The multi-degree-of-freedom magnetic field emission structure based on a two-dimensional magnetic coupling coil according to claim 1, characterized in that: The amount of magnetic flux generated by the first transmitting coil group (1) flowing into the third transmitting coil (3) is equal to the amount of magnetic flux flowing out.

5. An optimization method for a multi-degree-of-freedom magnetic field emission structure based on a two-dimensional magnetic coupling coil, characterized in that: The multi-degree-of-freedom magnetic field emission structure based on a two-dimensional magnetic coupling coil according to any one of claims 1 to 4, wherein the optimization method thereof comprises: S01. Set the desired transmitting coil parameters: input voltage U dc , system operating frequency f0, excitation current frequency f1 and coil size parameters; S02. Set the defined receiving coil parameters: output power P o , load resistance R L , filter inductor L f and coil size parameters; S03, according to the defined output power, in the initial posture, measuring the mutual inductance and output power of the coupling mechanism, selecting the number of turns of the third transmitting coil (3) that meets the expectations, and recording the magnetic field intensity generated at the center point at this time; S03, taking the magnetic field strength generated by the third transmitting coil (3) as a reference value, synchronously adjusting the number of turns of the first transmitting coil group (1) and the second transmitting coil group (2) until the scalar values ​​of the magnetic field strength generated at the center point of the receiving coil are equal, and defining the number of turns of the first transmitting coil group (1), the second transmitting coil group (2) and the third transmitting coil (3) at this time as the reference value; S04. When the value of the expected output of the receiving coil changes, the number of turns of the first transmitting coil group (1), the second transmitting coil group (2) and the third transmitting coil (3) can be adjusted synchronously and proportionally to obtain the corresponding required actual number of turns.

6. The optimization method of the multi-degree-of-freedom magnetic field emission structure based on the two-dimensional magnetic coupling coil according to claim 5 is characterized in that: The formula for measuring the output power in step S03 is as follows:

Images