Anti-offset wireless charging coupler for underwater vehicle

Abstract

The invention relates to an anti-offset wireless charging coupler for an underwater vehicle, which solves the problem that the multi-dimensional offset charging efficiency is reduced due to ocean current by adopting the collaborative design of a grouped serial-wound transmitting end and a geometric adaptive receiving end. The transmitting end is formed by connecting an outer ring winding and an inner ring winding in series, the outer ring provides wide-area magnetic field coverage, the inner ring strengthens the local magnetic field intensity, and the ferrite array is combined to suppress magnetic leakage to cope with horizontal and rotary offset; the receiving end adopts a curved surface type structure and fits the geometric contour of an aircraft shell, interference of a rotation offset delta phi on a magnetic field is limited through optimal design of a coverage angle theta, and magnetic flux is concentrated by a ferrite array on the back side to improve the coupling efficiency. The system does not need complex mechanical adjustment, realizes energy transmission through magnetic field coupling, keeps stable efficiency in seawater, fresh water and air environments, has the advantages of compact structure, high offset resistance, wide medium adaptability and high expandability, and remarkably improves the reliability and cruising ability of wireless charging of the underwater vehicle.

Description

Technical Field

[0001] The present invention relates to the wireless charging technology of underwater vehicles, and particularly to an anti-offset wireless charging coupler for underwater vehicles. Background Art

[0002] With the wide application of autonomous underwater vehicles (AUVs) in various fields such as ocean exploration, environmental monitoring, and underwater infrastructure maintenance, the demand for efficient and safe charging is becoming increasingly prominent. The traditional wired charging method requires physical connection underwater, which has problems such as interface corrosion, difficult docking, and the charging node being vulnerable to ocean current impact. Wireless power transfer (WPT) technology provides a non-physical contact underwater charging method for AUVs, significantly improving the operation efficiency and safety.

[0003] However, in the underwater environment, an AUV is prone to multi-dimensional offsets due to ocean currents during docking or mooring, including position and direction (horizontal and vertical offsets) and angular direction (rotational offset). The offset will significantly reduce the mutual inductance coefficient of the coupler, resulting in a sharp drop in the wireless energy transfer efficiency. Therefore, a coupler structure with multi-dimensional anti-offset ability is needed to achieve efficient and stable energy transfer when an underwater vehicle is applied in the underwater environment.

[0004] Existing anti-offset couplers mainly improve the anti-offset performance by increasing the coupler size, adopting a cylindrical / ring structure with a wider coverage, or spreading multiple transmitting coils in segments and regions. However, these solutions often have complex structures, large material volumes, high costs, or require additional mechanical and control systems to cooperate, and it is difficult to simultaneously consider the adaptability to multi-dimensional offsets and the simplicity of the structure.

[0005] It should be noted that the information disclosed in the above background art section is only used for understanding the background of the present application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0006] The main object of the present invention is to overcome the defects existing in the above background art, and provide an anti-offset wireless charging coupler for underwater vehicles.

[0007] To achieve the above object, the present invention adopts the following technical solutions: An anti-offset wireless charging coupler for underwater vehicles, comprising: A transmitting end coil module, adopting a grouped series-wound structure, composed of an outer winding and an inner winding connected in series, and fixed to a non-metallic bracket through a ferrite array; the outer winding is used to provide a wide-area magnetic field coverage, and the inner winding is used to enhance the local magnetic field intensity; The receiving coil module has a curved surface structure, which matches the outer shape of the underwater vehicle hull and fits closely. A ferrite array is arranged on its back to concentrate magnetic flux; the curved surface structure forms an arc coverage angle θ. Through geometric adaptation design, the rotation offset Δφ does not exceed a preset ratio of the coverage angle θ, thereby reducing the interference of rotation offset on magnetic field coupling. Among them, the transmitting coil module and the receiving coil module transfer energy through magnetic field coupling. The grouped series winding structure and the geometric adaptation of the curved surface receiver jointly achieve the resistance ability to horizontal and rotational offsets.

[0008] Further, the outer winding and the inner winding of the grouped series winding structure are in a concentric circle layout. The number of turns N of the outer winding p1 is greater than the number of turns N of the inner winding p2 , and the radius r of the inner winding p2 satisfies that is , where w p is the effective wire diameter of the winding, avoiding the interference of magnetic field overlap between the inner and outer circles.

[0009] Further, the ferrite array is composed of sheet or strip-shaped ferrites, which are respectively attached to the back of the transmitting coil module and the receiving coil module, and fixed to the non-metallic base by epoxy glue, for concentrating magnetic flux and reducing magnetic leakage loss.

[0010] Further, it also includes a control and monitoring unit connected to the transmitting coil module and the receiving coil module, which is used to monitor the transmission power, system efficiency and offset, and issue an equivalent alarm or switching strategy instruction when the coupling efficiency is lower than the preset threshold.

[0011] Further, the receiving coil is wound in an arc-shaped plane to form the curved surface structure. Preferably, the arc coverage angle θ = 60°.

[0012] Further, the arc coverage angle θ of the receiving coil satisfies Δφ ≤ (50% - 60%)θ to balance the local coupling strength and rotational redundancy.

[0013] The number of turns Ns of the receiving coil is set according to the coupling strength requirement, and its curved surface structure parameters are jointly optimized based on the geometric characteristics of the vehicle hull and the anti-offset tolerance.

[0014] Further, the wires of the transmitting coil module and the receiving coil module adopt Litz wires resistant to seawater corrosion, with a waterproof and insulating material coated on the outer layer, and epoxy resin is coated at the winding terminals for sealing.

[0015] Further, the coil structure parameters satisfy that the zero-offset coupling coefficient k0 is not lower than the target coupling coefficient k refand the change in mutual inductance during horizontal offset is controlled within 5% - 10%.

[0016] Furthermore, the non - metallic bracket is made of glass fiber - reinforced composite material, and the ferrite array is made of PC95 material. The two are fixed by a seawater - resistant adhesive to form an integrated encapsulation structure.

[0017] Furthermore, the outer - ring winding and the inner - ring winding of the transmitting - end coil module are wound with the same high - frequency Litz wire. Preferably, the single - layer spiral winding radius r p1 of the outer - ring winding is 175 mm, and the single - layer spiral winding radius r p2 of the inner - ring winding is 110 mm.

[0018] The present invention has the following beneficial effects: The present invention proposes an anti - offset wireless charging coupler for an underwater vehicle. Through the collaborative design of the transmitting - end coil with a grouped series - winding structure and the curved - surface receiving - end coil, combined with the guidance and concentration of the magnetic field by the ferrite array, it effectively solves the multi - dimensional offset problem caused by ocean currents during the wireless charging process of the underwater vehicle. The outer - ring winding of the transmitting - end provides wide - area magnetic - field coverage, and the inner - ring winding strengthens the local magnetic - field intensity, jointly suppressing the influence of horizontal offset (±40 mm) and rotational offset (±15°) on the coupling efficiency; the curved - surface structure of the receiving - end optimizes the coverage angle θ through geometric adaptation, and remains stably coupled when the rotational offset amount Δφ does not exceed the preset ratio of θ. Combined with the corrosion - resistant material and waterproof encapsulation design, the efficiency fluctuation of the system in media such as seawater, fresh water, and air does not exceed ±5%, and the self - inductance / mutual inductance is affected by the medium by less than ±2%. The overall structure is compact, without the need for complex mechanical adjustment or redundant control. By optimizing parameters (such as winding - turn distribution, arc - shaped coverage angle), it can adapt to different vehicle models, maintain high - efficiency energy transmission of more than 88% within a transmission distance of 25 - 35 mm, and has the advantages of strong anti - offset performance, wide environmental adaptability, high scalability, and low cost and easy mass production, significantly improving the endurance and operation reliability of the underwater vehicle.

[0019] Compared with the prior art, the significant advantages of the present invention are mainly reflected in the following aspects: Multi - dimensional anti - offset ability: Through the combined design of the outer - ring and inner - ring windings, the system can maintain a high coupling efficiency under horizontal offset, rotational offset, and other composite - offset conditions.

[0020] Wide medium adaptability: Due to the selection of seawater - corrosion - resistant materials and optimized coil structures, stable coupling characteristics can be maintained in environments such as seawater, fresh water, and air, with low efficiency fluctuation.

[0021] Strong scalability: On the premise of ensuring the established coupling efficiency, parameters such as coil windings, ferrite array arrangement, and arc coverage angle can be adjusted specifically through finite element simulation or experiments to adapt to different models or sizes of underwater vehicles.

[0022] Compact structure and easy to achieve large-scale production: The transmitting-end coil with a grouped series-wound structure is closely matched with the curved receiving-end coil, and the ferrite array is combined to provide concentrated magnetic flux. The overall structure is compact, facilitating integrated installation and mass production.

[0023] Other beneficial effects in the embodiments of the present invention will be further described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of an anti-offset wireless charging coupler for an underwater vehicle based on a grouped series-wound structure in an embodiment of the present invention.

[0025] Figure 2 is Figure 1 the mutual inductance test result of the anti-offset magnetic coupler shown during multi-dimensional offset.

[0026] Figure 3 is Figure 1 the system efficiency test result of the anti-offset magnetic coupler shown during multi-dimensional offset in different media.

[0027] REFERENCE SIGNS: 100 - Transmitting-end coil module 200 - Receiving-end coil module 300 - Ferrite array 400 - Outer shell of the underwater vehicle cabin 1 - Outer winding radius rp1 2 - Inner winding radius rp2 3 - Arc coverage angle θ 4 - Gap length d between the receiving-end coils. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following provides a detailed description of the embodiments of the present invention. It should be emphasized that the following description is merely exemplary and not intended to limit the scope of the present invention and its applications.

[0029] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. Additionally, the connection can be for a fixing function or a coupling or communication function.

[0030] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of 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 thus should not be construed as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0032] The present invention aims to overcome the problems of easy deviation and reduced coupling efficiency in the underwater wireless charging process of the prior art, and provides an anti-deviation wireless charging coupler for an underwater vehicle that has both strong anti-deviation ability and can adapt to various medium environments (seawater, fresh water, air).

[0033] Refer to Figure 1 , an embodiment of the present invention provides an anti-deviation wireless charging coupler for an underwater vehicle, including: a transmitting end coil module 100, which adopts a grouped series winding structure and is composed of an outer winding and an inner winding connected in series, and is fixed to a non-metallic bracket through a ferrite array; the outer winding provides a wide-area magnetic field coverage, and the inner winding strengthens the local magnetic field intensity, and through the synergistic effect of the two, the influence of horizontal deviation and rotational deviation on the coupling efficiency is suppressed; a receiving end coil module 200, which has a curved surface structure and can be matched with the abdominal shape of the outer shell 400 of the underwater vehicle cabin to fit closely, and a ferrite array 300 is arranged on its back to concentrate the magnetic flux; the curved surface structure forms an arc coverage angle θ, and through geometric adaptation design, the rotational deviation amount Δφ does not exceed a preset ratio of the coverage angle θ, thereby reducing the interference of rotational deviation on magnetic field coupling; wherein, the transmitting end coil module 100 and the receiving end coil module 200 transfer energy through magnetic field coupling, and the grouped series winding structure and the geometric adaptation of the curved surface receiving end jointly achieve the resistance to horizontal and rotational deviation.

[0034] In some embodiments, the design features of the transmitting coil module 100 of the grouped winding structure include: The transmitting coil module 100 is composed of two winding units (outer winding and inner winding), and is installed on a non-metallic bracket. The outer winding provides a magnetic field distribution covering a large range, and the inner winding strengthens the local magnetic field to cope with horizontal and angular offsets. The transmitter cooperates with a number of ferrite sheets or strip-shaped ferrites (ferrite array) to concentrate the magnetic flux and reduce magnetic leakage.

[0035] In some embodiments, the design features of the curved receiving coil module 200 include: The receiving coil has a curved surface structure and fits the outer shell of the underwater vehicle. By arranging a ferrite array on the back of the receiving coil, the magnetic flux is concentrated and the coupling efficiency is improved. The arc coverage angle θ of the curved surface structure can be optimally configured in combination with requirements such as the expected rotational offset Δφ, so as to maintain a higher coupling efficiency in space.

[0036] In some embodiments, the design features of the optimization of the coupler coil parameters: Determine the zero-offset coupling coefficient k0 through finite element simulation or experimental testing, and combine it with the target coupling coefficient k ref , for the number of turns N p1 of the outer winding or the winding radius r p1 for adjustment. Under the condition of satisfying k0≥k ref , then optimize the number of turns N p2 and the radius r p2 of the inner winding to minimize the change in mutual inductance under horizontal and rotational offsets as much as possible, and keep the coupling efficiency fluctuating within 5% - 10%. For the curved receiving coil, by controlling the arc coverage angle θ, a sufficiently high coupling efficiency can still be obtained under a certain range of Δφ rotational offsets.

[0037] In some embodiments, the design features of the materials and packaging: Use corrosion-resistant and seawater-resistant polymer composite materials or special alloy materials to ensure the structural stability and insulation performance of the coil or bracket under long-term immersion conditions. According to the application scenario, overall sealing or local protection methods can be further adopted. At the same time, maintain a high anti-offset performance for various forms of offsets (including horizontal and rotational) within a coupling distance of 25 mm - 35 mm.

[0038] In some embodiments, the coupler further includes a control and monitoring unit. Through the control and monitoring unit connected to the transmitter and receiver, real-time monitoring of the transmission power, system efficiency, and offset is achieved. When the coupling efficiency is lower than the preset threshold, an alarm can be issued in time or the circuit strategy can be switched to provide redundant protection or adaptive adjustment capabilities for the system.

[0039] The following further describes the specific embodiments of the present invention and experimental verification.

[0040] An underwater vehicle anti-deviation wireless charging coupler includes a transmitting coil module 100 and a receiving coil module 200. The transmitting coil module 100 adopts a grouped series winding structure, which is composed of two groups of winding units and is installed on a non-metallic bracket in conjunction with a number of ferrite sheets or strip ferrites (hereinafter collectively referred to as "ferrite arrays"); the grouped series winding structure includes an outer winding and an inner winding. The outer winding is used to provide a magnetic field distribution covering a larger range, and the inner winding is used to strengthen the close-range coupling strength to improve the adaptability to multi-dimensional deviation. The receiving coil module 200 is a curved structure, which is partially fitted with the shell of the underwater vehicle, and a ferrite array 300 is set on the back of the receiving coil; the transmitting coil module 100 and the receiving coil module 200 transmit energy through wireless magnetic field coupling, and the grouped series winding structure enables the receiving coil to maintain efficient coupling when it is offset in the horizontal direction and the angular direction. The ferrite array is arranged on the back of the transmitting end coil module 100 and the receiving end coil module 200 to concentrate and guide the magnetic flux, reduce the leakage flux and improve the coupling efficiency under the horizontal and angular offset conditions.

[0041] The coupler also includes a control and monitoring unit connected to the transmitting coil module 100 and the receiving coil module 200, which is used to monitor the transmission power, system efficiency and offset, and can issue an equivalent alarm or switch strategy instruction when the coupling efficiency is lower than a preset threshold.

[0042] The main materials of the transmitting end coil module 100 and the receiving end coil module 200 are both polymer composite materials or special alloy materials that are resistant to corrosion and seawater environments, and can maintain structural stability and good winding insulation performance under long-term immersion conditions.

[0043] The number of turns of the outer winding and the inner winding of the transmitting coil module 100 are respectively denoted as N p1 With N p2 , the number of turns of each radius is recorded as r p1 and r p2 ; By selecting N p2 < N p1 The inner winding provides auxiliary magnetic field without destroying the overall magnetic field distribution advantage of the transmitter. p2 Limited by the structural size of the outer winding, that is , where w p is the effective wire diameter of the coil Litz wire; by defining r p2 The maximum size of the inner and outer windings can avoid excessive overlap, ensuring that the inner winding can still assist in strengthening the local magnetic field under the design of a large-radius transmitting coil.

[0044] Preferably, the coil of the receiving end coil module 200 of the wireless charging coupler is designed by winding in an arc-shaped plane, and the selection of the arc coverage angle θ is determined in combination with the multi-dimensional offset tolerance requirements; when the required anti-rotation offset amount Δφ is determined, θ can be set according to Δφ ≤ (50% - 60%)θ, so as to improve the local coupling strength while ensuring the offset redundancy in the rotation direction.

[0045] The number of turns N of the outer winding p1 And the number of turns N of the inner winding p2 It is determined by referring to the change in mutual inductance ΔM1 of the coupler under the conditions of zero offset and the required anti-rotation offset amount Δφ, and ΔM1 is obtained through finite element simulation; when ΔM1 is less than the preset threshold, it is considered that there is sufficient resistance to rotational offset, thus completing the optimal configuration of the coil turns.

[0046] During the design and optimization process of the coil structure parameters, the zero-offset coupling coefficient k0 is obtained through finite element simulation. According to the difference between the target coupling coefficient k ref And the zero-offset coupling coefficient k0, the parameters r of the outer coil are optimized p1 , and then on the premise of satisfying k0 ≥ k ref , the change in mutual inductance of the inner coil parameters r under horizontal offset is evaluated through finite element simulation or experimental testing p2 To ensure that within the ΔX horizontal offset range, the change in mutual inductance is controlled within 5% - 10%.

[0047] In the actual working condition, the system can achieve the anti-offset performance when multiple offset forms (horizontal and rotation) exist simultaneously within a wide coupling distance by adjusting the turn ratio, wire diameter of the outer and inner windings at the transmitting end, and the arc coil coverage angle at the receiving end, taking into account the coupling strength and the uniformity of the magnetic field distribution. The anti-offset wireless charging coupler for the underwater vehicle is applicable to various medium environments such as seawater, fresh water, and air. The influence of different media on the self-inductance and mutual inductance of the system is controlled within ±2%, and the overall efficiency fluctuation does not exceed ±5%.

[0048] Examples and Verification An anti-offset wireless charging coupler for an underwater vehicle based on a grouped series-wound structure, as Figure 1 shown, mainly includes a transmitting end coil module and a receiving end coil module.

[0049] The transmitting end coil module 100 is composed of two concentric windings, an outer winding and an inner winding. Both the outer and inner circles are wound with Litz wire, and the inner and outer circles of the coil are wound with the same high-frequency Litz wire and are connected in series. The ferrite array is arranged closely behind the coil. The target coupling coefficient k in the coil parameter design refis 0.12, and ΔM1 does not exceed 5%. The specific coil parameters designed are as follows: the number of turns N of the outer coil winding p1 = 10 turns, wound in a single-layer helix, and the radius r of the outer coil winding p1 = 175 mm; the number of turns N of the inner coil winding p2 = 5 turns, wound in a single-layer helix, and the radius r of the inner coil winding p2 = 110 mm; the wire material uses Litz wire of 0.1 mm×300 strands, and the outer layer is a special insulating layer resistant to the seawater environment; the ferrite array selects sheet-shaped PC95 ferrite material, and each ferrite sheet is evenly distributed along the outer and inner perimeters and fixed to the non-metallic base by epoxy glue to reduce magnetic leakage and maintain maintainability.

[0050] The coil of the receiving coil module 200 is wound in an arc-shaped plane, and the arc coverage angle θ = 60°, which matches the geometric shape of the hull shell 400 of the underwater vehicle; the number of turns Ns of the receiving coil is about 25 turns to enhance the coupling strength; small ferrite sheets are also pasted on the back of the coil to form a ferrite array 300, mainly concentrated at both ends in the direction of the arc radius to concentrate the magnetic flux as much as possible. The gap length d between the receiving coil and the receiving coil is 30 mm.

[0051] The materials and encapsulation are as follows. The non-metallic bracket is made of glass fiber-reinforced composite material, and after gluing with the ferrite, it forms a complete coil carrier to ensure the mechanical strength and stability for long-term use in the seawater environment. Wire surface treatment: A waterproof film material is wrapped outside the enameled layer of the Litz wire, and waterproof epoxy resin is coated at each winding terminal to prevent salt spray or seawater erosion.

[0052] The simulation and testing are as follows.

[0053] Perform finite element simulation. Use three-dimensional electromagnetic field simulation software to establish the coil models of the transmitting end and the receiving end, and import the ferrite material parameters and seawater simulation medium parameters; set different offset conditions: horizontal offset [-40 mm, 40 mm], rotational offset [-15°, 15°], and record the changes in the coupling coefficient k and mutual inductance M under each condition.

[0054] Actual environment testing. Build a test platform with an adjustable coupling distance of 25 mm to 35 mm, fix the receiving coil on the simulated vehicle hull; use a slide rail and an angle turntable to achieve precise control of horizontal and rotational offsets, and test the system to be measured in a water tank filled with static seawater; measure the input power P of the coil under different offset conditions i 、output power P o , and calculate the transmission efficiency η = P o / P i ×100%.

[0055] Figure 2 shows Figure 1 the mutual inductance test results of the anti-offset magnetic coupler shown when there is multi-dimensional offset. It can be analyzed from Figure 2 that: when the receiving coil is offset along the X-axis, the mutual inductance M value corresponding to the non-rotational offset is slightly larger than that in the working condition of rotational offset of ±15°. Due to the X-axis symmetry of the coupler, the mutual inductance change trends of rotational offset of 15° and rotational offset of -15° are basically the same. Taking the experimental measurement value in the non-offset state as the reference, in the three offset working conditions of offset 40 mm along the X-axis and rotating 0°, offset 40 mm along the X-axis and rotating -15°, and offset 40 mm along the X-axis and rotating 15°, the fluctuation ranges of the mutual inductance are ±0.78%, ±3.01%, and ±3.13% respectively, fully proving that the proposed coupler has excellent anti-horizontal offset and anti-rotational offset capabilities.

[0056] Figure 3 shows Figure 1 the system efficiency test results of the anti-offset magnetic coupler shown when there is multi-dimensional offset in different media. Among them, [a mm, b mm, c°] respectively represent that the receiving coil is offset a mm along the X-axis, b mm along the Y-axis, and rotated c°. It can be analyzed from Figure 3 that: for the coupler proposed in the experiment in the air environment, the efficiencies when the offset amounts are [0 mm, 0 mm, 0°], [40 mm, 40 mm, 0°], [40 mm, 40 mm, -15°], and [40 mm, 40 mm, 15°] are 92.6%, 92.2%, 92.7%, and 84.4% respectively, and the efficiencies before and after offset are basically the same. The coupler efficiency shows a decreasing trend in air, fresh water, and seawater environments in turn, which is due to the fact that fresh water and seawater media will introduce additional eddy current losses, and the seawater environment has more significant eddy current losses due to higher conductivity. Generally speaking, the coupling efficiency of the system always remains above 80% and works with high efficiency under different environments and working conditions.

[0057] In summary, in view of the multi-dimensional offset problem during the underwater wireless charging process of the vehicle, the present invention proposes a multi-dimensional anti-offset magnetic coupler with a simple structure and the ability to resist horizontal and rotational offsets. The coupler includes a transmitting coil based on a grouped and series-wound structure and an arc-shaped receiving coil optimized according to the shape of the vehicle, and arrayed ferrites are arranged at both ends to effectively suppress magnetic leakage and concentrate magnetic flux. The proposed coupler can be at The horizontal offset range and the rotation offset range of ±15° maintain the stability of coupling. And maintain a high coupling efficiency of more than 88% within the energy transfer distance of 25 to 35 mm. Compared with the existing full-enclosed or complex mechanism design solutions, this coupler has a simple structure, which not only ensures stable coupling for multi-directional offsets, but also avoids high costs and cumbersome control. The underwater vehicle wireless charging magnetic coupler of the present invention is of great value in improving the underwater endurance and autonomous operation capabilities of AUVs, and has promotion and application value in the field of power electronics.

[0058] Compared with the prior art, the significant advantages of the present invention are mainly reflected in the following aspects: 1. Multi-dimensional anti-drift capability: Through the combined design of outer and inner windings, the system can maintain high coupling efficiency under horizontal drift, rotational drift and other compound drift conditions.

[0059] 2. Wide medium adaptability: Due to the selection of seawater corrosion-resistant materials and optimized coil structure, it can maintain stable coupling characteristics in seawater, fresh water and air environments with low efficiency fluctuations.

[0060] 3. Strong scalability: Under the premise of ensuring the established coupling efficiency, the coil winding, ferrite array layout, arc coverage angle and other parameters can be adjusted through finite element simulation or experiments to adapt to underwater vehicles of different models or sizes.

[0061] 4. Compact structure, easy to scale up: The transmitting coil with group series winding structure is closely matched with the curved receiving coil, combined with the ferrite array to provide concentrated magnetic flux. The overall structure is compact, which is easy to integrate, install and mass produce.

[0062] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several alternatives or modifications can be made to these described embodiments, and these alternative or modified forms should all be regarded as belonging to the protection scope of the present invention. In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. Without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the scope of protection of the patent application.

Claims

1. An underwater vehicle anti-offset wireless charging coupler, characterized in that, Comprising: A transmitting coil module, adopting a grouped series-wound structure, composed of an outer winding and an inner winding connected in series, and fixed to a non-metallic bracket by a ferrite array; the outer winding is used to provide wide-area magnetic field coverage, and the inner winding is used to enhance the local magnetic field intensity; A receiving coil module, having a curved surface structure, matching the outer shape of the underwater vehicle hull to fit closely, and having a ferrite array on its back to concentrate magnetic flux; the curved surface structure forms an arc coverage angle θ, and through geometric adaptation design, the rotation offset Δφ does not exceed a preset ratio of the coverage angle θ, so as to reduce the interference of rotation offset on magnetic field coupling; Wherein, the transmitting coil module and the receiving coil module transfer energy through magnetic field coupling, and the grouped series-wound structure and the geometric adaptation of the curved surface receiving end jointly achieve the resistance ability to horizontal and rotational offsets.

2. The anti-offset wireless charging coupler according to claim 1, wherein: The outer winding and the inner winding of the grouped and coiled structure are arranged in concentric circles, and the number of turns N of the outer winding p1 is greater than the number of turns N of the inner winding p2 , and the radius r of the inner winding p2 satisfies that is , where w p is the effective wire diameter of the winding, to avoid the magnetic field overlap interference between the inner and outer circles.

3. The anti-offset wireless charging coupler according to claim 1 or 2, characterized in that: The ferrite array is composed of sheet or strip ferrites, respectively attached to the backs of the transmitting coil module and the receiving coil module, and fixed to the non-metallic base by epoxy glue, for concentrating magnetic flux and reducing magnetic leakage loss.

4. The anti-offset wireless charging coupler according to claim 1 or 2, characterized in that: It further includes a control and monitoring unit connected to the transmitting coil module and the receiving coil module, for monitoring transmission power, system efficiency and offset, and issuing an equivalent alarm or switching strategy instruction when the coupling efficiency is lower than a preset threshold.

5. The anti-offset wireless charging coupler according to claim 1 or 2, characterized in that: The receiving coil is wound in an arc-shaped plane to form the curved surface structure.

6. The anti-offset wireless charging coupler according to claim 1 or 2, characterized in that: The arc coverage angle θ of the receiving coil satisfies Δφ ≤ (50% - 60%)θ to balance the local coupling intensity and rotational redundancy.

7. The anti-offset wireless charging coupler according to claim 1 or 2, characterized in that: The wires of the transmitting coil module and the receiving coil module adopt Litz wires resistant to seawater corrosion, with a waterproof and insulating material coated on the outer layer, and epoxy resin is coated at the winding terminals for sealing.

8. The anti-offset wireless charging coupler according to claim 1 or 2, characterized in that: The coil structure parameters satisfy that the zero-offset coupling coefficient k0 is not less than the target coupling coefficient k ref , and the change in mutual inductance during horizontal offset is controlled within 5% to 10%.

9. The anti-offset wireless charging coupler according to claim 1 or 2, characterized in that: The non-metallic bracket adopts a glass fiber reinforced composite material, and the ferrite array selects PC95 material, and the two are fixed by a seawater-resistant adhesive to form an integrated packaging structure.

10. The anti-offset wireless charging coupler according to claim 1 or 2, characterized in that: The outer winding and the inner winding of the transmitting coil module are wound with the same high-frequency Litz wire.

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