Underwater survey system

Abstract

An underwater survey system includes: a lifting device configured to make lifting motion underwater to survey an underwater environment; an above-water energy device disposed above the water surface and configured to convert initial direct-current electric energy into initial alternating-current electric energy; a coupling device including: a first coupling part electrically connected with the above-water energy device and configured to amplify the initial alternating-current electric energy into high-voltage alternating-current electric energy; a transmission part configured to transmit the high-voltage alternating-current electric energy to the underwater based on the conductivity of water; and a second coupling part disposed underwater and electrically connected with the transmission part and configured to reduce the high-voltage alternating-current electric energy transmitted by the transmission part into low-voltage alternating-current electric energy; and an underwater energy device disposed underwater and configured to convert the low-voltage alternating-current electric energy into direct-current power supply electric energy applied to an energy storage part of the lifting device.

Description

Technical Field

[0001] This invention relates to the field of underwater surveying technology, and in particular to a cable-based underwater surveying system suitable for inductively coupled power supply. Background Technology

[0002] Cable-tethered underwater survey systems are an important means of underwater surveying, navigation, and communication. Because they operate in a fixed position for extended periods, they can provide continuous underwater data and positioning references. However, the lifespan of current cable-tethered underwater survey systems is limited by their own energy carrying capacity, resulting in shortcomings such as short service life, low safety, and low power transmission efficiency. Summary of the Invention

[0003] To at least partially overcome the technical defects of at least one or more of the inventions mentioned above, at least one embodiment of the present invention provides an underwater survey system that, through a coupling device and an underwater energy device, can convert and process the initial DC power output from the surface energy device and transmit it to the energy storage unit in the lifting device for storage, thereby extending the service life of the underwater survey system.

[0004] According to one aspect of the present invention, an underwater survey system is provided, comprising: a lifting device configured to move up and down underwater to survey the underwater environment; a surface energy device disposed above the water surface and configured to convert initial DC electrical energy into initial AC electrical energy; a coupling device comprising: a first coupling part electrically connected to the surface energy device and configured to amplify the initial AC electrical energy into high-voltage AC electrical energy; a transmission part configured to transmit the high-voltage AC electrical energy to the underwater surface based on the conductivity of water; a second coupling part disposed underwater and electrically connected to the transmission part, configured to reduce the high-voltage AC electrical energy transmitted by the transmission part to low-voltage AC electrical energy; and an underwater energy device disposed underwater and configured to convert the low-voltage AC electrical energy into DC power supply energy applied to the energy storage part of the lifting device.

[0005] According to an embodiment of the present invention, the above-mentioned water energy device includes: a power supply unit disposed on the water surface and configured to provide the above-mentioned initial DC power to the underwater survey system; and an inverter circuit connected to the power supply unit and configured to convert the above-mentioned initial DC power into initial AC power.

[0006] According to an embodiment of the present invention, the first end of the first coupling part is electrically connected to the first end of the second coupling part via a cable, and the second end of the first coupling part is electrically connected to the second end of the second coupling part via water, so that the first coupling part, the cable, the second coupling part and the water form a closed loop.

[0007] According to an embodiment of the present invention, the first coupling portion includes: a first sealed housing, wherein a first receiving chamber is formed within the first sealed housing; a first primary coil, fixedly installed within the first receiving chamber, wherein the initial AC power is input into the first primary coil; and a first secondary coil, installed within the first receiving chamber and electrically coupled to the first primary coil to amplify the initial AC power into high-voltage AC power, wherein a first end of the first secondary coil is electrically connected to a first end of the cable, and a second end of the first secondary coil is electrically connected to water via a surface electrode; preferably, the first secondary coil is rotatably installed within the first receiving chamber to rotate with the cable.

[0008] According to an embodiment of the present invention, the second coupling portion includes: a second sealed housing, a second receiving chamber formed within the second sealed housing, through which the cable passes; a plurality of magnetic rings, spaced apart within the second receiving chamber, the cable passing sequentially through the magnetic rings to form a second primary coil with the magnetic rings, the second end of the cable being electrically connected to an underwater electrode, such that the first primary coil, the cable, the underwater electrode, water, and the surface electrode form a closed loop; and a plurality of secondary coils, respectively radially wound around the magnetic rings and sequentially electrically connected to electrically couple with the second primary coil, so as to reduce the high-voltage AC power to low-voltage AC power and transmit the low-voltage AC power to the underwater power supply device.

[0009] According to an embodiment of the present invention, the above-mentioned water energy device further includes: a compensation circuit disposed between the inverter circuit and the first primary coil, wherein the compensation circuit is configured to resonate with the first primary coil to stabilize the current flowing in the first primary coil.

[0010] According to an embodiment of the present invention, the underwater energy device further includes: a rectifier circuit, which is installed in the lifting device and connected between the second coupling part and the energy storage part, and is configured to convert the low-voltage AC power into DC power and transmit the DC power to the energy storage part.

[0011] According to an embodiment of the present invention, the second coupling part further includes: a first capacitor C1 disposed between the first end of the first primary coil and the first end of the cable; a second capacitor C2 disposed between the rectifier circuit and the first end of the cable; a first resistor R1 disposed between the second end of the first primary coil and the surface electrode; and a second resistor R2 disposed between the rectifier circuit and the second end of the cable; wherein the first capacitor C1 and the second capacitor C2 resonate with the plurality of magnetic ring groups.

[0012] According to an embodiment of the present invention, the underwater energy device further includes: an underwater main control unit adapted to control the operation of the lifting device; a battery management module adapted to monitor and control the voltage and current supplied to the energy storage unit through the underwater main control unit; preferably, the lifting device is connected to the cable via two rollers disposed on the outer sides of the opposite sides of the second coupling portion, so as to allow the cable to rotate relative to the lifting device.

[0013] According to an embodiment of the present invention, the compensation circuit includes: a first inductor L1 and a third capacitor C3 connected in series in the first branch; a third resistor R3 and a fourth resistor R4 connected in series in the second branch, wherein the first branch and the second branch are connected in parallel, the first end of the first branch is connected between the first transistor NM1 and the second transistor NM2, the first end of the second branch is connected between the third transistor NM3 and the fourth transistor NM4, and the second ends of the first branch and the second branch are respectively connected to the first primary coil; and a fourth capacitor C4 disposed in the third branch, wherein the first end of the third branch is located between the first inductor L1 and the third capacitor C3, and the second end of the third branch is located between the third resistor R3 and the fourth resistor R4.

[0014] According to an embodiment of the present invention, by converting initial DC power into initial AC power, the first coupling unit amplifies the initial AC power into high-voltage AC power, thereby increasing the power transmission distance. The second coupling unit reduces the high-voltage AC power to low-voltage AC power, and then the underwater energy device converts the low-voltage AC power into DC power and transmits it to the energy storage unit of the lifting device. This allows for continuous power supply to the lifting device, thereby extending the service life of the underwater survey system. The transmission unit, based on the conductivity of water, forms a loop between the surface energy device, the underwater energy device, and the energy storage unit. This eliminates the need for multiple loads in the lifting device and additional power supply connection points, thus improving the safety of the underwater survey system. Attached Figure Description

[0015] Figure 1 This diagram schematically illustrates the working principle of an underwater survey system according to an embodiment of the present invention.

[0016] Figure 2 A schematic diagram of an underwater survey system according to an embodiment of the present invention is shown.

[0017] Figure 3 This schematic diagram illustrates the overall structure of an underwater survey system according to an embodiment of the present invention.

[0018] Figure 4 A schematic front view of the first coupling portion according to an embodiment of the present invention is shown;

[0019] Figure 5 A schematic front view of the second coupling portion according to an embodiment of the present invention is shown;

[0020] Figure 6 The diagram schematically illustrates the connection relationship between the magnetic ring and the secondary coil according to an embodiment of the present invention.

[0021] Figure 7 The circuit structure diagram of an underwater survey system according to an embodiment of the present invention is shown schematically.

[0022] Figure 8 A schematic diagram illustrating the effect of the number of magnetic rings on the load power and power supply efficiency of an underwater survey system according to an embodiment of the present invention; and

[0023] Figure 9 A simplified circuit diagram of an underwater survey system according to an embodiment of the present invention is shown schematically.

[0024] Figure Labels

[0025] 1: Lifting device;

[0026] 12: Energy Storage Department;

[0027] 2: Water-based energy devices;

[0028] 21: Energy Supply Department;

[0029] 22: Inverter circuit;

[0030] 221: First transistor group;

[0031] NM1: First transistor;

[0032] NM2: Second transistor;

[0033] 222: Second transistor group;

[0034] NM3: Third transistor;

[0035] NM4: Fourth transistor;

[0036] 23: Compensation circuit;

[0037] L1: First inductor;

[0038] R3: Third resistor;

[0039] R4: Fourth resistor;

[0040] C3: Third capacitor;

[0041] C4: Fourth capacitor;

[0042] 24: Surface main control unit;

[0043] 3: Underwater power devices;

[0044] 31: Rectifier circuit;

[0045] 311: First diode group;

[0046] D1: First diode;

[0047] D2: Second diode;

[0048] 312: Second diode group;

[0049] D3: Third diode;

[0050] D4: Fourth diode;

[0051] C5: Fifth capacitor;

[0052] 32: Battery Management Module;

[0053] 33: Underwater main control unit;

[0054] 4: Coupling device;

[0055] 41: First coupling part;

[0056] 411: First primary coil;

[0057] 412: First stage coil;

[0058] 413: Fixed position;

[0059] 414: Rotating compartment;

[0060] 42: Second coupling section;

[0061] 421: Magnetic ring;

[0062] 4211: First magnetic ring;

[0063] 4212: Second magnetic ring;

[0064] 4213: Third magnetic ring;

[0065] 4214: Fourth magnetic ring;

[0066] 4215: Fifth magnetic ring;

[0067] 4216: Sixth magnetic ring;

[0068] 4217: The seventh magnetic ring;

[0069] 4218: The eighth magnetic ring;

[0070] 422: Secondary stage coil;

[0071] 4221: The first secondary stage coil;

[0072] 4222: The second secondary stage coil;

[0073] 4223: The third secondary stage coil;

[0074] 4224: The fourth secondary coil;

[0075] 4225: The fifth secondary coil;

[0076] 4226: The sixth secondary coil;

[0077] 4227: The seventh secondary coil;

[0078] 4228: The eighth secondary coil;

[0079] 423: Second sealing housing;

[0080] 424: Second primary coil;

[0081] C1: First capacitor;

[0082] C2: Second capacitor;

[0083] R1: First resistor;

[0084] R2: Second resistor;

[0085] 425: Output wire connector;

[0086] 426: Cable;

[0087] 43: Transmission Department;

[0088] 44: Surface electrode;

[0089] 45: Underwater electrode;

[0090] 5: Watertight cable;

[0091] 6: Roller. Detailed Implementation

[0092] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. However, the present invention can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided to make the disclosure thorough and complete, and to fully convey the scope of the invention to those skilled in the art. In the accompanying drawings, for clarity, the dimensions and relative dimensions of layers and regions may be exaggerated, and the same reference numerals denote the same elements throughout.

[0093] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the invention for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0094] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0095] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0096] To facilitate understanding of the technical solutions of this invention by those skilled in the art, the following technical terms are explained below.

[0097] When using expressions such as "at least one of A, B, and C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.). Similarly, when using expressions such as "at least one of A, B, or C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.).

[0098] Figure 1 The diagram illustrates the working principle of an underwater survey system according to an embodiment of the present invention. Figure 2 The circuit diagram of an underwater survey system according to an embodiment of the present invention is shown schematically. Figure 3 The diagram schematically illustrates the overall structure of an underwater survey system according to an embodiment of the present invention.

[0099] Embodiments of the present invention provide an underwater survey system, such as... Figure 1 and Figure 3 As shown, the underwater survey system includes a lifting device 1, a surface energy device 2, an underwater energy device 3, and a coupling device 4. Specifically, the lifting device 1 is configured to move up and down underwater to survey the underwater environment. The surface energy device 2 is located above the water surface and is configured to convert initial DC power into initial AC power. The coupling device 4 includes a first coupling section 41, a second coupling section 42, and a transmission section 43. The first coupling section 41 is electrically connected to the surface energy device 2 and is configured to amplify the initial AC power into high-voltage AC power. The transmission section 43 is configured to transmit the high-voltage AC power to the second coupling section 42 based on the conductivity of water. The second coupling section 42 is located underwater and is electrically connected to the transmission section 43, and is configured to reduce the high-voltage AC power transmitted by the transmission section 43 to low-voltage AC power. The underwater energy device 3 is located underwater and is configured to convert the low-voltage AC power into DC power for use in the energy storage section 12 of the lifting device 1.

[0100] According to an embodiment of the present invention, by converting initial DC power into initial AC power, the first coupling part 41 amplifies the initial AC power into high-voltage AC power, thereby increasing the power transmission distance. The second coupling part 42 reduces the high-voltage AC power to low-voltage AC power, and then the underwater energy device 3 converts the low-voltage AC power into DC power supply power and transmits it to the energy storage part 12 of the lifting device 1. This can continuously supply power to the lifting device 1, thereby extending the service life of the underwater survey system. The transmission part 43 forms a circuit between the surface energy device 2, the underwater energy device 3, and the energy storage part 12 based on the conductivity of water. This eliminates the need for multiple loads in the lifting device 1 and the need for additional power supply connection points. Power transmission is achieved through inductive coupling, realizing contactless power supply, replacing the traditional electrical connection method. This can improve the reliability and safety of the underwater survey system and has the characteristics of high reliability and high dynamic power transmission efficiency.

[0101] In some embodiments, the surface energy device 2 includes a power supply unit 21 and an inverter circuit 22. Specifically, the power supply unit 21 is disposed on the water surface and configured to provide initial DC power to the underwater survey system. The inverter circuit 22 is connected to the power supply unit 21 and is configured to convert the initial DC power into initial AC power.

[0102] Furthermore, the underwater survey system can be configured as a cable-tethered underwater survey system, positioned at a fixed location, with the lifting device 1 moving up and down to continuously monitor the underwater conditions at that location. The power supply unit 21 can be a solar power generation device, continuously supplying power to the lifting device 1 by converting solar energy into electrical energy. The power supply unit 21 can also be a surface-mounted lithium battery or other types of rechargeable batteries. Figure 1 and Figure 2As shown, the power supply unit 21 can be represented as a DC power supply. The inverter circuit 22 can convert the initial DC power in DC form into high-frequency initial AC power output in AC form, for example, converting it into 40kHz AC power.

[0103] Figure 4 A schematic front view of the first coupling portion 41 according to an embodiment of the present invention is shown.

[0104] like Figures 1 to 3 As shown, in some embodiments, the first end of the first coupling portion 41 (e.g. Figure 2 The upper end of the middle) and the first end of the second coupling part 42 (e.g.) Figure 2 The upper end of the first coupling part 41 is electrically connected via cable 426, and the second end of the first coupling part 41 (e.g.) Figure 2 The lower end of the middle) and the second end of the second coupling part 42 (e.g. Figure 2 The lower end of the cable 426 is connected to the water via a water-electricity connection, forming a closed loop between the first coupling part 41, the cable 426, the second coupling part 42, and the water. By forming a closed loop between the cable 426 and the water, the complexity and cost of the system can be reduced, and the underwater survey system can obtain electrical energy at any position on the cable 426.

[0105] like Figures 1 to 4 As shown, in some embodiments, the first coupling part 41 includes a first primary coil 411, a first secondary coil 412, and a first sealing housing 413. Specifically, a first receiving chamber is formed within the first sealing housing 413. The first primary coil 411 is fixedly installed within the first receiving chamber, and initial AC power is input into the first primary coil 411 through a sealed interface. The first secondary coil 412 is installed within the first receiving chamber and electrically coupled to the first primary coil 411 to amplify the initial AC power into high-voltage AC power. The first end of the first secondary coil 412 is electrically connected to the first end of the cable 426 through the sealed interface, and the second end of the first secondary coil 412 is connected to water via a surface electrode 44.

[0106] like Figure 1 and Figure 2 As shown, in some embodiments, the first primary coil 411 and the first secondary coil 412 can be represented as two coupled inductors. The first secondary coil 412 is rotatably mounted in the first housing chamber to rotate with the cable 426 when the cable 426 is impacted by water flow. The first secondary coil 412 rotates with the cable 426 relative to the first primary coil 411, releasing the torque on the cable 426 caused by the water flow, thereby reducing the impact of the water flow on the cable 426 and the surface energy device 2, and reducing the impact of the water flow on the underwater survey system. The first secondary coil 412, the cable 426, the second coupling part 42, the water, and the surface electrode 44 form a closed loop. Figures 2 to 4As shown, the first primary coil 411 is provided with a fixed compartment 413, and the first primary coil 412 is provided with a rotating compartment 414. The fixed compartment 413 and the rotating compartment 414 are installed in the first receiving chamber to respectively accommodate the first primary coil 411 and the first primary coil 412.

[0107] In one exemplary embodiment, a fixed compartment and a rotating compartment that can rotate relative to the first accommodating chamber are provided at a distance from the first accommodating chamber, and a first primary coil 411 and a first secondary coil 412 are respectively installed in the fixed compartment and the rotating compartment.

[0108] Figure 5 A schematic front view of the second coupling portion 42 according to an embodiment of the present invention is shown.

[0109] like Figures 1 to 5 As shown, in some embodiments, the second coupling part 42 includes a plurality of magnetic rings 421, a plurality of secondary coils 422, a second sealing housing 423, and a cable 426. Specifically, a second receiving chamber is formed within the second sealing housing 423, and the cable 426 passes through the second receiving chamber. The magnetic rings 421 are spaced apart in the second receiving chamber, and the cable 426 passes through the magnetic rings 421 in sequence to form a second primary coil 424 with the magnetic rings 421. The second end of the cable 426 is electrically connected to the underwater electrode 45, so that the first primary coil 412, the cable 426, the underwater electrode 45, the water, and the surface electrode 44 form a closed loop. The secondary coils 422 are radially wound around the magnetic rings 421 and electrically connected in sequence to be electrically coupled to the second primary coils 424 to reduce the high-voltage AC power to low-voltage AC power and transmit the low-voltage AC power to the underwater power supply device 3.

[0110] Figure 6 The diagram illustrates the connection relationship between the magnetic ring and the secondary coil according to an embodiment of the present invention.

[0111] Furthermore, taking an example with eight magnetic rings 421, the connection method between the magnetic rings 421 and the secondary coil 422 can be as follows: Figure 6As shown, the eight magnetic rings 421 can be labeled as the first magnetic ring 4211 to the eighth magnetic ring 4218, and the corresponding eight secondary coils 422 can be labeled as the first secondary coil 4221 to the eighth secondary coil 4228. The first secondary coil 4221 to the eighth secondary coil 4228 can be formed by winding the same Litz wire. The first secondary coil 4221 is wound on the first magnetic ring 4211 and connected to the output wire 425 and the second secondary coil 4222 respectively; the second secondary coil 4222 is wound on the second magnetic ring 4212 and connected to the first secondary coil 4221 and the third secondary coil 4223 respectively; the third secondary coil 4223 is wound on the third magnetic ring 4213 and connected to the second secondary coil 4222 and the fourth secondary coil 4228 respectively. 24 connections; the fourth secondary coil 4224 is wound around the fourth magnetic ring 4214 and connected to the third secondary coil 4223 and the fifth secondary coil 4225 respectively; the fifth secondary coil 4225 is wound around the fifth magnetic ring 4215 and connected to the fourth secondary coil 4224 and the sixth secondary coil 4226 respectively; the sixth secondary coil 4226 is wound around the sixth magnetic ring 4216 and connected to the fifth secondary coil 4225 and the seventh secondary coil 4227 respectively; the seventh secondary coil 4227 is wound around the seventh magnetic ring 4217 and connected to the sixth secondary coil 4226 and the eighth secondary coil 4228 respectively; the eighth secondary coil 4228 is wound around the eighth magnetic ring 4218 and connected to the seventh secondary coil 4227 and the output wire 425 respectively.

[0112] Through simulation and measurement, it can be concluded that the spacing between each magnetic ring in the first magnetic ring 4211 to the eighth magnetic ring 4218 can be set to greater than or equal to 3.5cm to ensure that the spacing between each secondary coil is small enough to be negligible. The spacing between every two adjacent magnetic rings can be set to 3.5cm.

[0113] In some embodiments, the water-based energy device 2 further includes a compensation circuit 23. Specifically, the compensation circuit 23 is disposed between the inverter circuit 22 and the first primary coil 411. The compensation circuit 23 is configured to resonate with the first primary coil 411, reduce the loop impedance, and stabilize the current flowing through the first primary coil 411. The inverter circuit 22 can be connected to the first primary coil 411 via a watertight cable 5.

[0114] In some embodiments, the underwater energy device 3 includes a rectifier circuit 31. Specifically, it is installed inside the lifting device 1 and connected between the second coupling part 42 and the energy storage part 12, and is configured to convert low-voltage AC power into DC power and transmit the DC power to the energy storage part 12.

[0115] The initial AC power is converted into high-voltage AC power, for example, into 40kHz AC power, via the first coupling part 41. The high-voltage AC power is converted into low-voltage AC power, for example, into 40kHz AC power, via the second coupling part 42, and then transmitted to the rectifier circuit 31 through the coupling relationship. The rectifier circuit 31 can also play a filtering role.

[0116] Figure 7 The circuit diagram of an underwater survey system according to an embodiment of the present invention is shown schematically.

[0117] like Figure 2 and Figure 7 As shown, in some embodiments, the inverter circuit 22 includes a first transistor group 221 and a second transistor group 222. Specifically, the first transistor group 221 includes a first transistor NM1 and a second transistor NM2. The second transistor group 222 includes a third transistor NM3 and a fourth transistor NM4.

[0118] Furthermore, the first gate of the first transistor NM1 is connected to the fourth gate of the fourth transistor NM4, the second gate of the second transistor NM2 is connected to the third gate of the third transistor NM3, the first drain of the first transistor NM1 and the third drain of the third transistor NM3 are respectively connected to the first terminal of the power supply section 21, the second source of the second transistor NM2 and the fourth source of the fourth transistor NM4 are connected to the second terminal of the power supply section 21, the first source of the first transistor NM1 is connected to the second drain of the second transistor NM2, and the third source of the third transistor NM3 is connected to the fourth drain of the fourth transistor NM4.

[0119] Figure 8 The diagram illustrates the effect of the number of magnetic rings 421 according to an embodiment of the present invention on the load power and power supply efficiency of the underwater survey system.

[0120] like Figure 2 and Figure 8 As shown, in some embodiments, the second coupling section 42 further includes a first capacitor C1, a second capacitor C2, a first resistor R1, and a second resistor R2. Specifically, the first capacitor C1 is disposed between the first end of the primary coil 412 and the first end of the cable 426. The second capacitor C2 is disposed between the rectifier circuit 31 and the first end of the cable 426. The first resistor R1 is disposed between the second end of the primary coil 412 and the surface electrode 44. The second resistor R2 is disposed between the rectifier circuit 31 and the second end of the cable 426.

[0121] Furthermore, the first capacitor C1 and the second capacitor C2 resonate with multiple magnetic rings 421 to improve the voltage and current gain and reduce reactive power loss in the underwater exploration system. Figure 4As shown, the second coupling section 42 may include eight magnetic rings 421 connected in series and eight secondary coils 422. The eight secondary coils 422, the eight magnetic rings 421 connected in series, and the cable 426 are equivalent to eight coupled inductors connected in series. The magnetic rings 421 have a hollow structure, and the cable 426 is inserted into the magnetic rings 421. The second coupling section 42 may also include two output wire ends 425 respectively disposed therein. The output wire ends 425 can be connected to the second capacitor C2 and the second resistor R2 through the two ends of the second sealing housing 423. The second sealing housing 423 may be a watertight shell. The secondary coils 422 may be Litz wire. An appropriate spacing may be set between the magnetic rings 421 to avoid mutual inductance between the magnetic rings 421. For example, the spacing between the magnetic rings 421 may be set to 3.5 cm to avoid mutual inductance between the magnetic rings 421. A system model can be established using circuit theory, and then the influence of the number of magnetic rings on the power and efficiency of the underwater exploration system can be analyzed. Furthermore, by analyzing and selecting the number of magnetic rings, the system efficiency can be improved. For example, if the maximum length of the underwater survey system's submerged portion is 40 cm, the magnetic ring 421 weighs 150 g, and the power supply unit 21 has a charging power of not less than 50 W, then the magnetic ring 421 and the secondary coil 422 can be configured as eight units, such as... Figure 8 As shown, it can meet the power requirements of underwater survey systems and has high charging efficiency.

[0122] In some embodiments, the underwater energy device 3 further includes an underwater main control unit 33 and a battery management module 32. Specifically, the underwater main control unit 33 is adapted to control the operation of the lifting device 1. The battery management module 32 is adapted to monitor and control the voltage and current supplied to the energy storage unit 12 via the underwater main control unit 33. In some embodiments, the lifting device 1 can be connected to the cable 426 via two rollers 6 disposed on the opposite sides of the second coupling part 42, allowing the cable 426 to rotate relative to the lifting device 1. The battery management module 32 is connected to the energy storage unit 12 and can control the amount of electricity stored in the energy storage unit 12, thereby improving the safety of the energy storage unit 12. The battery management module 32 and the energy storage unit 12 can be represented as a load.

[0123] Furthermore, the surface electrode 44 and the underwater electrode 45 are electrically connected based on the conductivity of water, thereby forming a circuit between the energy storage unit 12 and the energy supply unit 21. The second-stage coil 422 includes two output terminals connected to the cable 426 and the surface electrode 44, respectively. When the first-stage coil 412 rotates relative to the first primary coil 411 along with the cable 426, the second-stage coil 422 also rotates relative to the first-stage coil 412 along with the cable 426.

[0124] like Figure 2 and Figure 7As shown, in some embodiments, the compensation circuit 23 includes a first inductor L1 and a third capacitor C3 connected in series in the first branch, a third resistor R3 and a fourth resistor R4 connected in series in the second branch, and a fourth capacitor C4 disposed in the third branch. Specifically, as... Figure 7 As shown, the first branch and the second branch are connected in parallel. The first end of the first branch is connected between the first transistor NM1 and the second transistor NM2, and the first end of the second branch is connected between the third transistor NM3 and the fourth transistor NM4. The second ends of the first and second branches are respectively connected to the first primary coil 411. The first end of the third branch is located between the first inductor L1 and the third capacitor C3, and the second end of the third branch is located between the third resistor R3 and the fourth resistor R4. The compensation circuit 23, through the inductor-capacitor-capacitor (LCC) topology, can ensure that the current of the first primary coil 411 is constant.

[0125] like Figure 2 and Figure 7 As shown, in some embodiments, the rectifier circuit 31 includes a first diode group 311, a second diode group 312, and a fifth capacitor C5 connected in parallel with the second coupling section 42 and the energy storage section 12, respectively. Specifically, the first diode group 311 includes a first diode D1 and a second diode D2 connected in series, and the second capacitor C2 is connected between the first diode D1 and the second diode D2. The second diode group 312 includes a third diode D3 and a fourth diode D4 connected in series, and a second resistor R2 is connected between the third diode D3 and the fourth diode D4.

[0126] Figure 9 A simplified circuit diagram of an underwater survey system according to an embodiment of the present invention is shown schematically.

[0127] like Figure 9 As shown, the initial DC power after passing through inverter circuit 22 can be represented as follows:

[0128]

[0129] Among them, U bus This can be expressed as the voltage value of the initial DC power output by the power supply unit 21, U. in It can be represented as the effective value of the output voltage of inverter circuit 22.

[0130] The rectifier circuit 31 and the load can be equivalent to an impedance R. eq The expression is:

[0131]

[0132] Among them, R L It can be represented as the resistance value of the load, which can be represented as the battery management module 32 and the energy storage unit 12.

[0133] According to Kirchhoff's voltage law (KVL), the following expression can be derived:

[0134]

[0135] Where ω=2πf can be expressed as the angular frequency of the initial alternating current, I in It can be expressed as the effective value of the initial alternating current; I p1 and I p2 This can be represented as the current flowing through the third capacitor C3 and the fourth capacitor C4, respectively; L p This can be expressed as the inductance value of the first primary coil 411; L m This can be expressed as the inductance value of the primary coil 412; I m This can be expressed as the current value passing through the primary coil 412; M pm This can be expressed as the mutual inductance between the first primary coil 411 and the first secondary coil 412; I in This can be expressed as the effective value of the output current of inverter circuit 22; It can be represented as the sum of the self-inductances of multiple magnetic rings 421; M cs This can be expressed as the mutual inductance value of the coupled inductor group 425; I eq This can be expressed as passing through impedance R eq The current value.

[0136] Furthermore, the underwater survey system also includes the resonance condition shown in equation (4):

[0137]

[0138] in, This can be represented as the sum of the mutual inductances of multiple magnetic rings 421 and cable 426. It can be set that the self-inductances of the multiple magnetic rings 421 are all the same, and the mutual inductances of the multiple magnetic rings 421 and cable 426 are all the same, i.e., L. c1 =L c2 =…=L cn L s1 =L s2 =…=L sn Ignoring the third resistor R3 and the fourth resistor R4, the current through the first primary coil 411 can be obtained as follows:

[0139]

[0140] Furthermore, the current flowing through the third capacitor C3 and the fourth capacitor C4 is unaffected by subsequent circuitry; therefore, regardless of changes in the load resistance, I... p1 and Ip2 Keeping it unchanged can improve the stability of the system.

[0141] In some embodiments, the surface energy device 2 further includes a surface control unit 24. The surface control unit 24 is connected to the first gate, the second gate, the third gate, and the fourth gate, respectively, and is configured to control the operating frequency of the inverter circuit 22. The surface control unit 24 can control the operating frequency of the inverter circuit 22 by generating pulse width modulation (PWM) signals to the first gate, the second gate, the third gate, and the fourth gate. The underwater survey system can also implement voltage and current detection functions by setting sensors.

[0142] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference to the directions in the accompanying drawings and are not intended to limit the scope of protection of the present invention. Throughout the accompanying drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted where they may cause confusion in understanding the present invention, and the shapes and dimensions of the components in the drawings do not reflect actual size and proportion, but are only schematic representations of the embodiments of the present invention.

[0143] Unless otherwise stated, the numerical parameters in this specification and the appended claims are approximate values ​​and can be varied according to the desired characteristics obtained from the content of this invention. Specifically, all figures used in the specification and claims to indicate the content of components, reaction conditions, etc., should be understood to be modified by the term "about" in all cases. Generally, this means that there may be variations of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, and ±0.5% in some embodiments.

[0144] The use of ordinal numbers such as "first," "second," "third," etc., in the specification and claims to modify the corresponding elements does not imply that the element has any ordinal number, nor does it represent the order of one element with another element, or the order of manufacturing methods. The use of these ordinal numbers is only to enable a named element to be clearly distinguished from another element with the same name.

[0145] Furthermore, unless specifically described or required to occur in sequence, the order of steps is not limited to those listed above and can be varied or rearranged according to the desired design. Moreover, embodiments can be used in combination with each other or with other embodiments based on design and reliability considerations; that is, technical features from different embodiments can be freely combined to form more embodiments.

[0146] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An underwater survey system, characterized by, include: The lifting device is configured to move up and down underwater to survey the underwater environment; A floating energy device, installed above the water surface, is configured to convert initial direct current electrical energy into initial alternating current electrical energy; The coupling device includes: The first coupling part is electrically connected to the water energy device and is configured to amplify the initial AC power into high-voltage AC power. A transmission unit is configured to transmit the high-voltage alternating current to underwater based on the conductivity of water; and A second coupling unit, disposed underwater and electrically connected to the transmission unit, is configured to reduce the high-voltage AC power transmitted by the transmission unit to low-voltage AC power; a first end of the first coupling unit is electrically connected to a first end of the second coupling unit via a cable, and a second end of the first coupling unit is electrically connected to a second end of the second coupling unit via water, such that the first coupling unit, the cable, the second coupling unit, and the water form a closed loop; and An underwater energy device, installed underwater, is configured to convert the low-voltage AC power into DC power for use in the energy storage section of the lifting device; The first coupling part includes: A first sealing housing, wherein a first receiving chamber is formed within the first sealing housing; A first primary coil is fixedly installed in the first receiving chamber, and the initial alternating current is input into the first primary coil; and The first primary coil is installed in the first accommodating chamber and electrically coupled to the first primary coil to amplify the initial AC power into high voltage AC power. The first end of the first primary coil is electrically connected to the first end of the cable, and the second end of the first primary coil is connected to the water through a surface electrode. The second coupling part includes: A second sealed housing, within which a second receiving chamber is formed, through which the cable passes; Multiple magnetic rings are spaced apart in the second receiving chamber. The cable passes through the magnetic rings sequentially to form a second primary coil with the magnetic rings. The second end of the cable is electrically connected to an underwater electrode, such that the first primary coil, the cable, the underwater electrode, the water, and the surface electrode form a closed loop; and Multiple secondary coils are radially wound around the magnetic ring and electrically connected in sequence to electrically couple with the second primary coil, so as to reduce the high-voltage AC power to low-voltage AC power and transmit the low-voltage AC power to the underwater power supply device.

2. The underwater survey system of claim 1, wherein, The above-water energy device includes: The power supply unit, located on the water surface, is configured to provide the initial DC power to the underwater survey system. An inverter circuit, connected to the power supply unit, is configured to convert the initial DC power into initial AC power.

3. The underwater survey system of claim 1, wherein, The primary coil is rotatably mounted in the first housing chamber to rotate with the cable.

4. The underwater survey system of claim 2, wherein, The above-water energy device also includes: A compensation circuit is disposed between the inverter circuit and the first primary coil. The compensation circuit is configured to resonate with the first primary coil to stabilize the current flowing through the first primary coil.

5. The underwater survey system of claim 2, wherein, The underwater energy device also includes: A rectifier circuit, installed inside the lifting device and connected between the second coupling part and the energy storage part, is configured to convert the low-voltage AC power into DC power and transmit the DC power to the energy storage part.

6. The underwater survey system of claim 5, wherein, The second coupling part further includes: A first capacitor C1 is disposed between the first end of the first primary coil and the first end of the cable; The second capacitor C2 is disposed between the rectifier circuit and the first end of the cable; A first resistor R1 is disposed between the second end of the primary coil and the surface electrode; and The second resistor R2 is disposed between the rectifier circuit and the second end of the cable; The first capacitor C1 and the second capacitor C2 resonate with the plurality of magnetic ring groups.

7. The underwater survey system of claim 1, wherein, The underwater energy device also includes: An underwater main control unit is used to control the operation of the lifting device; The battery management module is suitable for monitoring and controlling the voltage and current supplied to the energy storage unit via the underwater main control unit.

8. The underwater survey system of claim 7, wherein, The lifting device is connected to the cable via two rollers located on the outer sides of the second coupling portion on opposite sides, allowing the cable to rotate relative to the lifting device.

9. The underwater survey system of claim 4, wherein, The compensation circuit includes: The first inductor L1 and the third capacitor C3 are connected in series in the first branch; A third resistor R3 and a fourth resistor R4 are connected in series in the second branch. The first branch is connected in parallel with the second branch. The first end of the first branch is connected between the first transistor NM1 and the second transistor NM2. The first end of the second branch is connected between the third transistor NM3 and the fourth transistor NM4. The second ends of the first branch and the second branch are respectively connected to the first primary coil. A fourth capacitor C4 is disposed on the third branch, wherein the first end of the third branch is located between the first inductor L1 and the third capacitor C3, and the second end of the third branch is located between the third resistor R3 and the fourth resistor R4.

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