Unmanned aerial vehicle wireless charging transmitter, receiver and anti-offset magnetic coupler

Abstract

The invention discloses an unmanned aerial vehicle wireless charging transmitter, receiver and anti-offset magnetic coupler, the unmanned aerial vehicle wireless charging transmitter comprises a wireless charging transmitter and a wireless charging receiver, the wireless charging transmitter comprises a transmitting coil and a ferrite array, the transmitting coil is arranged on the ferrite array, the ferrite array comprises a central ferrite and a plurality of ferrite rods, and the ferrite rods are arranged on the central ferrite. A plurality of ferrite rods are radially distributed around the central ferrite, the ferrite array covers the whole area of the transmitting coil, a gap exists between the wireless charging receiver and the wireless charging transmitter, the wireless charging receiver and the wireless charging transmitter are arranged at intervals, and the wireless charging receiver comprises a receiving coil. By arranging the ferrite array, the area of the transmitting coil is larger than that of the receiving coil, the area perpendicular to the magnetic induction line direction is increased, the receiving coil can be covered, the magnetic flux is not affected, the requirements for positioning and alignment in the charging process are reduced, the wireless power transmission efficiency and the reliability of the charging system are improved, and the operation cost of the unmanned aerial vehicle is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronics and wireless charging, and in particular to a wireless charging transmitter, a receiver and an anti-drift magnetic coupler for an unmanned aerial vehicle. Background Art

[0002] With the development of transportation electrification, unmanned aerial vehicles (UAVs), as a new type of flying equipment, have shown great potential in many fields, especially in traffic monitoring, logistics distribution, infrastructure inspection, and power line maintenance. However, the working distance and standby time of UAVs are severely limited by battery capacity. The development of highly reliable and flexible charging solutions is important for the widespread application of UAVs. Due to the convenience and applicability of wireless power transmission (WPT), WPT technology is considered to be an effective way to solve the problem of power supply for UAVs.

[0003] The core challenge of an efficient WPT system is the efficient wireless transmission of electrical energy, which depends largely on the relative position and alignment accuracy between the transmitter and the receiver. As the drone hovers and moves, the relative position may change. In this case, the traditional WPT charging system is easily damaged, resulting in reduced charging efficiency or even charging interruption. Summary of the invention

[0004] Based on this, it is necessary to propose a UAV wireless charging transmitter, receiver and anti-offset magnetic coupler to address the above problems, which reduces the requirements for positioning and alignment during the charging process, ensures reliable charging of the UAV, and reduces the operating cost of the UAV.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A wireless charging transmitter for an unmanned aerial vehicle comprises a transmitting coil and a ferrite array, wherein the transmitting coil is arranged on the ferrite array, the ferrite array comprises a central ferrite and a plurality of ferrite rods, the plurality of ferrite rods are radially distributed around the central ferrite, the transmitting coil comprises an inner circle and an outer circle forming concentric circles, the number of turns of the inner circle is the same as the number of turns of the outer circle and they are arranged in series, the central ferrite is aligned with the center of the transmitting coil, and the ferrite array covers the entire area of ​​the transmitting coil.

[0008] In one embodiment, the plurality of ferrite rods are no less than five and are distributed in an array, arranged counterclockwise and at equal angles to form a ferrite array, and the length of the ferrite rod is greater than the radius of the outer ring.

[0009] In one embodiment, the central ferrite comprises a cylinder or a polygonal body, and the polygonal body has at least four edges.

[0010] In one embodiment, the outer diameter of the outer ring is rp1, the outer diameter of the inner ring is rp2, and the ratio of the outer diameters of the inner ring to the outer ring, rp2 / rp1, is between 0.4 and 0.8.

[0011] A drone wireless charging receiver is used in conjunction with a drone wireless charging transmitter described in any one of the above embodiments. The drone wireless receiver includes a receiving coil, and the outer diameter of the receiving coil is rs, where rs is 5-20 cm.

[0012] In one embodiment, the receiving coil has more than 10 turns.

[0013] In one embodiment, the receiving coil has 25 turns.

[0014] A UAV wireless charging anti-offset magnetic coupler comprises a UAV wireless charging transmitter and a UAV wireless charging receiver as described in any one of the above embodiments, wherein there is a gap between the UAV wireless charging transmitter and the UAV wireless receiver and the two are arranged at intervals, and the wireless charging transmitter emits electromagnetic waves to the wireless charging receiver.

[0015] In one embodiment, the ratio rs / rp1 between the outer diameter of the receiving coil and the outer diameter of the transmitting coil is between 0.2-0.6.

[0016] In one embodiment, the gap is 1-20 cm.

[0017] By setting up a ferrite array, a transmitting coil consisting of an inner ring and an outer ring connected in series is set on the ferrite rod to maintain the uniformity of the magnetic field, and make the area of ​​the transmitting coil larger than the area of ​​the receiving coil, and the area perpendicular to the direction of the magnetic flux lines is increased. When the receiving coil moves within a certain range in the direction perpendicular to the magnetic flux lines, the transmitting coil can still cover the receiving coil and does not affect the magnetic flux, thereby reducing the requirements for the relative position and accuracy between the transmitter and the receiver during the charging process, reducing the requirements for positioning and alignment during the charging process, improving the efficient wireless transmission of electric energy, improving the reliability of the charging system, and reducing the operating cost of the drone. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] in:

[0020] Figure 1 This is a physical picture of the three-dimensional structure of the ferrite array of the wireless charging transmitter for unmanned aerial vehicles described in the present invention;

[0021] Figure 2 This is a physical picture of the three-dimensional structure of the transmitting coil of the wireless charging transmitter of a drone described in the present invention;

[0022] Figure 3 This is a physical picture of the three-dimensional structure of a receiving coil of a wireless charging receiver for a drone described in the present invention;

[0023] Figure 4 yes Figure 3 The diagram shows the mutual inductance test results when the wireless charging receiver of the drone is offset in the X-axis direction;

[0024] Figure 5 yes Figure 3 The schematic diagram of the test results of the transmitting coil self-inductance and the receiving coil self-inductance when the wireless charging receiver of the drone is offset in the X-axis direction is shown;

[0025] Figure 6 It is a three-dimensional structural schematic diagram of a wireless charging transmitter, a receiver and an anti-drift magnetic coupler for a drone according to the present invention;

[0026] Figure 7 This is a physical picture of the three-dimensional structure of a wireless charging transmitter, receiver and anti-drift magnetic coupler for unmanned aerial vehicles described in the present invention.

[0027] The symbols in the accompanying drawings are described as follows:

[0028] 1. Wireless charging transmitter; 11. Transmitting coil; 111. Inner ring; 112. Outer ring; 12. Ferrite array; 121. Central ferrite; 122. Ferrite rod; 2. Wireless charging receiver; 21. Receiving coil. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly on another element, or there can be one or more centered elements therebetween. The terms "upper", "lower", "left", "right", "upper end", "lower end", "top" and "bottom" used in this specification indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0031] In order to solve the problem that the WPT system has high requirements for the location of wireless power transmission in the existing technology, and the WPT charging system is easily damaged, the charging efficiency is reduced, or even the charging is interrupted due to the movement of the drone, the following will combine the attached Figures 1 to 7 A wireless charging transmitter, a receiver and an anti-drift magnetic coupler for an unmanned aerial vehicle provided in an embodiment of the present invention are described in detail.

[0032] See also Figure 1 and Figure 2 , Figure 1 This is a three-dimensional structure diagram of the ferrite array of the wireless charging transmitter for unmanned aerial vehicles described in the present invention. Figure 2 This is a physical picture of the three-dimensional structure of the transmitting coil of the wireless charging transmitter for unmanned aerial vehicles described in the present invention.

[0033] A wireless charging transmitter for unmanned aerial vehicles, comprising:

[0034] The wireless charging transmitter 1 includes a wireless charging transmitter 1 and a ferrite array 12. The wireless charging transmitter 1 is arranged on the ferrite array 12. The ferrite array 12 includes a central ferrite 121 and a plurality of ferrite rods 122. The plurality of ferrite rods 122 are radially distributed around the central ferrite 121. The wireless charging transmitter 1 includes an inner circle 111 and an outer circle 112 forming concentric circles. The number of turns of the inner circle 111 is the same as the number of turns of the outer circle 112 and they are arranged in series. The central ferrite 121 is aligned with the center of the circle of the wireless charging transmitter 1. The ferrite array 12 covers the entire area of ​​the wireless charging transmitter 1.

[0035] Specifically, a magnetic coupler, also known as a magnetic coupler, a magnetic coupling or a permanent magnet transmission device, is a mechanical device that uses a magnetic field to transfer energy. During the energy transfer process of wireless charging, the size of the magnetic flux directly affects the efficiency and stability of wireless charging. The larger the area of ​​the wireless charging transmitter 1 and the receiving coil 21 in the magnetic field, the larger the magnetic flux, and the higher the efficiency and stability of wireless charging.

[0036] In a uniform magnetic field, the magnetic flux Φ=BS. In addition to the area S of the wireless charging transmitter 1 and the receiving coil 21 in the magnetic field, the magnetic flux is also affected by the magnetic induction intensity B. If the wireless charging transmitter 1 and the receiving coil 21 are offset in their planes, the effective area S of the magnetic field is affected, which largely depends on the relative position and alignment accuracy between the wireless charging transmitter 1 and the wireless charging receiver 2.

[0037] From the mutual inductance coefficient M=Φ / I, we know that Φ=MI, the magnetic flux is positively correlated with the mutual inductance coefficient. The factors affecting the mutual inductance mainly include the number of coil turns, magnetic flux changes, the physical distance between coils, the choice of core material, the ratio of the number of turns, changes in current and frequency, magnetic flux saturation effect and magnetic field shielding.

[0038] The number of turns of the coil increases and the magnetic field strength is enhanced: the wireless charging transmitter 1 is set to include an inner ring 111 and an outer ring 112 forming concentric circles, and the inner ring 111 and the outer ring 112 both have 8-15 turns. The number of turns of the inner ring 111 is the same as the number of turns of the outer ring 112 and are arranged in series. The advantages of this are: the concentric circles ensure that the magnetic fields of the inner ring 111 and the outer ring 112 are uniform, the ferrite is aligned with the wireless charging transmitter 1 to ensure a uniform magnetic field, and the series arrangement is equivalent to increasing the number of turns of the wireless charging transmitter 1 and thereby enhancing the magnetic field strength, while ensuring that the current is the same and the magnetic field generated is the same. At the same time, the inner ring 111 and the outer ring 112 increase the magnetic field area S generated by the wireless charging transmitter 1.

[0039] The closer the physical distance, the greater the mutual inductance, which facilitates the propagation and interaction of magnetic fields;

[0040] The choice of core material, the type and shape of the core will affect the distribution and strength of the magnetic field, thus affecting the size of the mutual inductance coefficient;

[0041] Turns ratio: The more turns, the greater the mutual inductance. The mutual inductance can be adjusted by controlling the turns ratio;

[0042] Changes in current and frequency: Increases in current and frequency will cause changes in the distribution and intensity of the magnetic field, thus affecting the mutual inductance coefficient;

[0043] Magnetic flux saturation effect: When the magnetic flux density reaches a certain value, magnetic flux saturation effect will occur, resulting in a decrease in mutual inductance coefficient;

[0044] Shielding of magnetic field: The external magnetic field will also affect the mutual inductance coefficient. Shielding can reduce the interference of the external magnetic field on the mutual inductance coefficient;

[0045] The magnitude of the mutual inductance depends on the geometry, size, relative position of the two coils and the magnetic permeability of the medium surrounding them.

[0046] As a non-metallic magnetic material, ferrite has a high magnetic permeability at high frequencies, is ferromagnetic, and is a strong magnetic material used to make high-frequency electromagnetic devices with low eddy current loss. Metal magnetic materials can have adverse effects on the human body in high-frequency electromagnetic fields. Compared with metal magnetic materials, ferrite avoids adverse effects on humans and has higher magnetic permeability at high frequencies. From μ=B / H, it is known that magnetic permeability is positively correlated with magnetic induction intensity. Therefore, when ferrite is used, the magnetic induction intensity B is increased, and then the magnetic flux Φ is increased, which is beneficial to the energy transfer of the wireless charging transmitter 1, the efficient wireless transmission of electric energy, and the reliability of the charging system. For drones, it reduces the operating cost.

[0047] The inner ring 111 and the outer ring 112 of the wireless charging transmitter 1 are wound by the same high-frequency Litz wire to realize the series setting. Litz wire is selected as a winding wire, which is suitable for high-current applications. It is made of multiple thin wires woven or twisted in a specific way. Different from flat wires, Litz wire is woven by multiple strands of filaments or thin wires. The current can be evenly distributed between each filament or thin wire, reducing current concentration and Joule loss. The evenly distributed current is conducive to generating a uniform magnetic field distribution, thereby ensuring the uniformity of the magnetic flux within the charging range, which is conducive to the energy transfer efficiency of the wireless charging transmitter 1, and thus improving the wireless transmission efficiency. Since the Litz wire is woven by multiple strands of filaments or thin wires, its structure is relatively strong, has high mechanical strength and wear resistance, and is conducive to the reliability of the charging system.

[0048] Array distribution arranges and combines a series of elements or devices according to certain rules or patterns to achieve specific functions or goals, which can improve performance, enhance reliability, optimize data processing, etc. Through reasonable array distribution, the overall performance of the wireless charging transmitter 1 can be effectively improved, while increasing the fault tolerance and stability of the wireless charging transmitter 1. For example, the ferrite is arrayed and multiple ferrite rods 122 are arranged in a certain way to make the generated magnetic field more uniform, which is beneficial to the energy transfer of the wireless charging transmitter 1, and is beneficial to the efficient wireless transmission of electrical energy, improving the reliability of the charging system, and reducing the operating cost for drones.

[0049] In one embodiment, the plurality of ferrite rods 122 are not less than five and are distributed in an array, arranged counterclockwise and at equal angles to form a ferrite array 12, and the length of the ferrite rods is greater than the radius of the outer ring.

[0050] Specifically, through reasonable array distribution, the overall performance of the system can be effectively improved, while increasing the fault tolerance and stability of the system. The ferrite is arrayed, and the number of ferrite rods 122 is not less than 5, and 8 can be selected. When the 8 ferrite rods 122 are arranged counterclockwise at equal angles, the length of the ferrite rod is greater than the radius of the outer ring, thereby satisfying the coverage of the entire wireless charging transmitter 1 area, making the generated magnetic field more uniform, which is beneficial to the energy transfer between the wireless charging transmitter 1 and the receiving coil 21, and is beneficial to the efficient wireless transmission of electrical energy, improving the reliability of the charging system, and reducing the operating cost for drones.

[0051] Specifically, if the ferrite array 12 is to cover the entire area of ​​the wireless charging transmitter 1, the length of the ferrite rod 122 needs to be equal to or greater than the diameter of the outer ring 112 of the wireless charging transmitter 1, and is generally greater than the diameter of the outer ring 112 of the wireless charging transmitter 1. In this way, full coverage of the wireless charging transmitter 1 can be achieved, a more uniform magnetic field can be generated, which is conducive to efficient wireless transmission of electrical energy, improves the reliability of the charging system, and reduces operating costs for drones.

[0052] In one embodiment, the central ferrite 121 includes a cylinder or a polygonal body, and the polygonal body has at least four edges.

[0053] Specifically, the selection of the core material, the type and shape of the core will affect the distribution and strength of the magnetic field, thereby affecting the size of the mutual inductance coefficient. The more edges the central ferrite 121 has and the closer it is to a cylinder, the more conducive it is to generating a uniform magnetic field, which in turn is conducive to the energy transfer between the wireless charging transmitter 1 and the receiving coil 21, and is conducive to the efficient wireless transmission of electrical energy, thereby improving the reliability of the charging system and reducing the operating cost for drones.

[0054] In one embodiment, the outer diameter of the outer ring 112 is rp1, the outer diameter of the inner ring 111 is rp2, and the ratio rp2 / rp1 of the outer diameters of the transmitting inner ring 111 and the outer ring 112 is between 0.4 and 0.8.

[0055] Specifically, it has been verified through experiments that, when other quantities remain unchanged, when the ratio of the outer diameter of the transmitting inner ring 111 to the outer ring 112 is between 0.4-0.8, the self-inductance and mutual inductance remain stable, and the magnetic field generated by the wireless charging transmitter 1 does not change significantly. At this time, the charging system is recognized to remain stable. When the ratio of the outer diameter of the transmitting inner ring 111 to the outer ring 112 exceeds 0.4-0.8, the self-inductance and mutual inductance change significantly, and the charging system cannot maintain a stable state. This experiment uses the control variable method and the comparison method to keep the variables of other factors affecting the mutual inductance unchanged, and set multiple groups of wireless charging transmitters 1 and receiving coils 21 with different outer diameter ratios. The values ​​of the outer diameter ratios are regularly distributed, for example, 0.1, 0.2...0.9, and find the interval range in which the mutual inductance and self-inductance do not change much.

[0056] See also Figure 3 , Figure 4 and Figure 5 , Figure 3 This is a three-dimensional structure of a receiving coil of a wireless charging receiver for drones described in the present invention. Figure 4 yes Figure 3 The diagram shows the mutual inductance test results of the wireless charging receiver of the drone when it is offset in the X-axis direction. Figure 5 yes Figure 3 The diagram shown is a schematic diagram of the test results of the transmitting coil self-inductance and the receiving coil self-inductance of the drone wireless charging receiver when it is offset in the X-axis direction.

[0057] A drone wireless charging receiver is used in conjunction with a drone wireless charging transmitter described in any of the above embodiments. The drone wireless receiver includes a receiving coil. The outer diameter of the receiving coil 21 is rs, and rs is generally 5-20 cm.

[0058] Specifically, there is a gap between the wireless charging receiver 2 and the wireless charging transmitter 1 and they are spaced apart. The wireless charging receiver 2 includes a receiving coil 21 , and the wireless charging receiver 2 is used to receive electromagnetic waves emitted by the wireless charging transmitter 1 .

[0059] Since the outer diameter of the receiving coil 21 needs to take into account the actual application environment, for example, the volume of the drone, a redundant area S needs to be reserved to facilitate the passage of magnetic flux lines and increase the chargeable area. For example, when the receiving coil 21 is displaced in the horizontal direction, the redundant area still has magnetic flux lines passing through it and can be charged. This is conducive to efficient wireless transmission of electric energy, improves the reliability of the charging system, and reduces the operating cost for drones.

[0060] In one embodiment, the receiving coil 21 has more than 10 turns.

[0061] Specifically, the ratio of the number of turns affects the mutual inductance, and thus the magnetic flux: the more turns, the greater the mutual inductance coefficient, and the magnitude of the mutual inductance coefficient can be adjusted by controlling the ratio of the number of turns, thereby affecting the magnetic flux. It has been verified experimentally that the number of turns of the receiving coil 21 is more than 10 turns to ensure that the converted electrical energy can meet the charging needs of the drone.

[0062] In one embodiment, the receiving coil 21 has 25 turns.

[0063] Specifically, it has been verified through experiments that when the receiving coil 21 has 25 turns, the drone charging effect is best.

[0064] See also Figure 6 and Figure 7 , Figure 6 This is a three-dimensional structural diagram of a wireless charging transmitter, receiver and anti-drift magnetic coupler for unmanned aerial vehicles according to the present invention. Figure 7 This is a physical picture of the three-dimensional structure of a wireless charging transmitter, receiver and anti-drift magnetic coupler for unmanned aerial vehicles described in the present invention.

[0065] A UAV wireless charging anti-offset magnetic coupler comprises a UAV wireless charging transmitter and a UAV wireless charging receiver as described in any one of the above embodiments, wherein there is a gap between the UAV wireless charging transmitter and the UAV wireless receiver and the two are arranged at intervals, and the wireless charging transmitter emits electromagnetic waves to the wireless charging receiver.

[0066] The anti-drift capability of the coupler of the present invention is centrally symmetrical and has excellent anti-drift capability. In the offset region of twice the outer diameter of the receiving coil 21 in the XY plane, the fluctuations of the mutual inductance and the coupling coefficient are very small, and do not affect the magnetic flux, thereby reducing the requirements for the relative position and accuracy between the wireless charging transmitter 1 and the wireless charging receiver 2 during the charging process, reducing the requirements for positioning and alignment during the charging process, improving the efficient wireless transmission of electric energy, improving the reliability of the charging system, reducing the operating cost of the drone, and having a simple structure and easy operation.

[0067] In one embodiment, the ratio rs / rp1 between the outer diameter of the receiving coil 21 and the outer diameter of the wireless charging transmitter 1 is between 0.2 and 0.6.

[0068] Specifically, the ratio of the outer diameter of the receiving coil 21 to the outer diameter of the wireless charging transmitter 1 affects the area S perpendicular to the direction of the magnetic flux lines. Due to the hovering and movement of the drone, the relative position of the receiving coil 21 and the wireless charging transmitter 1 may change. When the area of ​​the wireless charging transmitter 1 is larger than the area of ​​the receiving coil 21, even if the receiving coil 21 moves slightly in the XY plane, it is still above the wireless charging transmitter 1 and will not affect the charging. It has been verified by experiments that when the drone is charging, the general movement range will not exceed a specific numerical range. Therefore, the ratio of the outer diameter of the receiving coil 21 to the outer diameter of the wireless charging transmitter 1, rs / rp1, is between 0.2-0.6, which can meet the requirement that the receiving coil 21 will not move out of the top of the wireless charging transmitter 1 after moving. The requirements for the relative position and alignment accuracy between the wireless charging transmitter 1 and the wireless charging receiver 2 are reduced, which is conducive to the efficient wireless transmission of electric energy, improves the reliability of the charging system, and reduces the operating cost for drones.

[0069] In one embodiment, the gap is 1-20 cm.

[0070] Specifically, the closer the physical distance between the receiving coil 21 and the wireless charging transmitter 1, the greater the mutual inductance coefficient, which is conducive to the propagation and interaction of the magnetic field. When the distance exceeds a certain range, the mutual inductance coefficient is too small to meet the needs of power conversion. It has been verified experimentally that when the gap between the receiving coil 21 and the wireless charging transmitter 1 is 1-20cm, the charging needs can be met.

[0071] The present invention has the following beneficial effects:

[0072] The present invention provides a simple and effective high-anti-deviation coupler for the UAV WPT charging system. The present invention has the following advantages:

[0073] (1) The coupler of the present invention has excellent anti-offset capability. In the offset region of twice the outer diameter of the receiving coil 21 in the XY plane, the fluctuations of the mutual inductance and the coupling coefficient are very small.

[0074] (2) During the offset process, the self-inductance of the coils of the wireless charger wireless charging transmitter 1 and the wireless charger wireless charging receiver 2 can remain stable, ensuring that the WPT system maintains an efficient resonant state.

[0075] (3) The anti-deviation capability of the coupler of the present invention has central symmetry, that is, it has excellent anti-deviation capability in all directions of the XY plane.

[0076] (4) The coupler of the present invention has a simple structure and can achieve high anti-deviation capability without the need for additional control methods, and has a wide range of practical applications.

[0077] (5) By setting up a ferrite array 12, a transmitting coil 11 connected in series by an inner ring 111 and an outer ring 112 is set on the ferrite rod 122 to maintain the uniformity of the magnetic field, and the area of ​​the transmitting coil 11 is made larger than the area of ​​the receiving coil 21, and the area perpendicular to the magnetic flux line is increased. When the receiving coil 21 moves within a certain range in the direction perpendicular to the magnetic flux line, the transmitting coil 11 can still cover the receiving coil 21 without affecting the magnetic flux, thereby reducing the requirements for the relative position and accuracy between the wireless charging transmitter 1 and the wireless charging receiver 2 during the charging process, reducing the requirements for positioning and alignment during the charging process, improving the efficient wireless transmission of electric energy, improving the reliability of the charging system, and reducing the operating cost of the drone. The requirements for the relative position and accuracy between the wireless charging transmitter 1 and the wireless charging receiver 2 during the charging process are reduced, reducing the requirements for positioning and alignment during the charging process, improving the efficient wireless transmission of electric energy, improving the reliability of the charging system, and reducing the operating cost of the drone.

[0078] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention is described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wireless charging transmitter for unmanned aerial vehicles, characterized in that: include: A transmitting coil and a ferrite array, wherein the transmitting coil is arranged on the ferrite array, the ferrite array comprises a central ferrite and a plurality of ferrite rods, the plurality of ferrite rods are radially distributed around the central ferrite, the transmitting coil comprises an inner circle and an outer circle forming concentric circles, the number of turns of the inner circle is the same as the number of turns of the outer circle and they are arranged in series, the central ferrite is aligned with the center of the transmitting coil, and the ferrite array covers the entire area of ​​the transmitting coil.

2. The wireless charging transmitter for unmanned aerial vehicles according to claim 1, characterized in that: The plurality of ferrite rods are no less than five and are distributed in an array, arranged counterclockwise and at equal angles to form a ferrite array, and the length of the ferrite rod is greater than the radius of the outer ring.

3. The wireless charging transmitter for unmanned aerial vehicles according to claim 1, characterized in that: The central ferrite comprises a cylinder or a polygonal body, and the polygonal body has at least four edges.

4. The wireless charging transmitter for unmanned aerial vehicles according to claim 1, characterized in that: The outer diameter of the outer ring is rp1, the outer diameter of the inner ring is rp2, and the ratio of the outer diameters of the inner ring to the outer ring, rp2 / rp1, is between 0.4 and 0.

8.

5. A wireless charging receiver for drones, characterized in that: Used in conjunction with a drone wireless charging transmitter as described in any one of claims 1 to 4, the drone wireless receiver includes a receiving coil, the outer diameter of the receiving coil is rs, and rs is 5-20cm.

6. The wireless charging receiver for unmanned aerial vehicles according to claim 5, characterized in that: The receiving coil has more than 10 turns.

7. The wireless charging receiver for unmanned aerial vehicles according to claim 6, characterized in that: The receiving coil has 25 turns.

8. An anti-deviated magnetic coupler for wireless charging of drones, characterized in that: It comprises a UAV wireless charging transmitter and a UAV wireless charging receiver as described in any one of claims 1 to 7, wherein there is a gap between the UAV wireless charging transmitter and the UAV wireless receiver and they are arranged at an interval, and the wireless charging transmitter emits electromagnetic waves to the wireless charging receiver.

9. The wireless charging receiver for unmanned aerial vehicles according to claim 8, characterized in that: The ratio rs / rp1 between the outer diameter of the receiving coil and the outer diameter of the transmitting coil is between 0.2 and 0.

6.

10. The wireless charging receiver for unmanned aerial vehicles according to claim 8, characterized in that: The gap is between 1-20 cm.

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