An underwater wireless power transmission structure with double transmitting coils for AUVs

Abstract

The application discloses a kind of dual transmitting coil underwater wireless power transmission structures for AUV, comprising: power supply ship for providing electric energy;Semi-enclosed transmission structure for receiving the electric energy transmitted by the power supply ship, the semi-enclosed transmission structure converts alternating current electric energy into magnetic field energy and outputs;AUV device for receiving the electric field energy transmitted by the underwater wireless power transmission structure, the AUV device converts the received magnetic field energy into alternating current electricity.The scheme uses dual transmitting coil to provide energy, which is beneficial to improve power while ensuring efficiency, and experiments have proved that, under the same input, the scheme can realize double output compared with single transmitting coil, and reduces the influence of coil misalignment and magnetic leakage loss, improves transmission efficiency.

Description

Technical Field

[0001] This invention relates to the field of AUV power supply technology, and more particularly to a dual-transmitting-coil underwater wireless power transmission structure for AUVs. Background Technology

[0002] Currently, AUVs mostly use high-power wired charging systems for power transmission. However, wired charging systems suffer from prominent problems such as rigid connections, connector wear and corrosion, and inconvenient operation of high-power plug interfaces. Meanwhile, current underwater wireless power supply systems face the following drawbacks: insufficient transmission power and efficiency to power AUVs; a conflict between distance and size; when the distance between two coils increases, the coil radius needs to be increased to achieve the same transmission effect; unstable power transmission; and underwater wireless charging, due to its complex and variable environment, has even higher requirements for stability. The uncertainty of water flow impacts the transmission effect of the wireless charging system. Currently, various solutions have been proposed to address the stability of wireless charging, but most of them use complex mechanical structures to maintain the stability of the magnetic core gap, which leads to structural complexity and increased system weight. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention discloses a dual-transmitter coil underwater wireless power transfer structure for AUVs, comprising:

[0004] A power supply ship that provides electrical power;

[0005] A semi-enclosed transmission structure that receives electrical energy transmitted by the power supply ship, the semi-enclosed transmission structure converting AC electrical energy into magnetic field energy and outputting it.

[0006] An AUV device that receives electric field energy transmitted by the underwater wireless power transmission structure, and the AUV device converts the received magnetic field energy into alternating current.

[0007] The power supply vessel includes an onboard DC power supply, a high-frequency inverter, and a feedback control loop. The onboard DC power supply is connected to the high-frequency inverter, and the high-frequency inverter is connected to the feedback control loop.

[0008] The semi-enclosed transmission structure includes a first transmitting coil, a second transmitting coil, a receiving coil, and an anti-eddy current baffle. The first and second transmitting coils convert electrical energy into magnetic field energy and transmit it to the receiving coil. The receiving coil converts the received magnetic field energy into electric field energy and outputs it to the AUV device. The magnetic shielding material shell is the shell of the wireless power transmission structure, which has the function of isolating the diffusion of internal and external magnetic fields, which is conducive to improving transmission efficiency. The anti-eddy current baffle is set in the hollow part of the semi-enclosed transmission structure, which can block the eddy current path in the underwater high-frequency wireless power transmission, thereby preventing eddy current loss in the high-frequency electrical power transmission process.

[0009] The AUV device includes a rectifier bridge module and an AUV battery pack. The rectifier bridge circuit converts the electrical energy transmitted by the receiving coil into direct current and charges the AUV battery pack.

[0010] The AUV device also includes a semi-enclosed magnetic shielding housing, with the first transmitting coil, the second transmitting coil, and the receiving coil disposed inside the semi-enclosed magnetic shielding housing.

[0011] By adopting the above technical solution, the present invention provides a dual-transmitting-coil underwater wireless power transmission structure for AUVs. This solution uses dual transmitting coils to provide energy, which is beneficial to improve power while ensuring efficiency. Experiments have confirmed that, under the same input conditions, this solution can achieve twice the output compared to a single transmitting coil, and reduces the impact of coil misalignment and leakage magnetic loss, thereby improving transmission efficiency. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the underwater wireless power transmission system with dual transmitting coils according to the present invention;

[0014] Figure 2 This is a circuit diagram of the underwater wireless power transmission structure with dual transmitting coils of the present invention.

[0015] Figure 3 This is a schematic diagram of the underwater wireless power transmission structure of the present invention.

[0016] Figure 4 This is a control flowchart of the dual-transmitting-coil underwater wireless power transmission system of the present invention. Detailed Implementation

[0017] To make the technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention:

[0018] like Figure 1The diagram illustrates a dual-transmitting-coil underwater wireless power transfer structure for an AUV, comprising a power supply vessel 101, a semi-enclosed transmission structure 102, and an AUV device 103. The power supply vessel 101 provides electrical energy, the semi-enclosed transmission structure 102 receives the electrical energy transmitted by the power supply vessel 101, converts the alternating electrical energy into changing magnetic field energy, and outputs it. The AUV device 103 receives the magnetic field energy transmitted by the underwater wireless power transfer structure 102, converts the received magnetic field energy into electrical energy, and charges the battery pack.

[0019] The semi-enclosed transmission structure 102 completes the energy transmission process while reducing magnetic leakage and mitigating the effects of misalignment. It includes two transmitting coils and their control circuits for generating electrical energy, and a receiving coil and an anti-eddy current baffle to receive energy from the transmitting coils. The anti-eddy current baffle reduces eddy current losses.

[0020] like Figure 1 As shown, the power supply and replenishment vessel 101 includes a DC power supply 204, a high-frequency inverter circuit 205, and a feedback control loop 206. The DC power supply 204 provides controllable DC power to provide energy for the entire system. The high-frequency inverter circuit 205 converts the DC power provided by the replenishment vessel's DC power supply into high-frequency AC power. The feedback control loop 206 drives and controls the high-frequency inverter circuit 205. The DC power supply 204, the high-frequency inverter circuit 205, and the feedback control loop 206 together constitute a negative resistance module, realizing the property that the voltage and current of the negative resistance are in phase.

[0021] The negative resistance module uses a microcontroller for synchronization control, ensuring that the frequencies of the two transmitting coils are transmitted in phase to the receiving coil. The system uses a frequency range of 100kHz to 500kHz for transmission. The control flowchart is shown below. Figure 4 .

[0022] like Figure 3As shown, the semi-enclosed transmission structure 102 includes a first transmitting coil 104, a second transmitting coil 106, and a receiving coil 105. The first transmitting coil 104 and the second transmitting coil 106 convert high-frequency alternating current into magnetic field energy and send it to the receiving end. The receiving coil 105 receives the magnetic field energy sent by the transmitting coil and converts it back into alternating current for transmission. The semi-enclosed transmission structure 102 also includes an anti-eddy current baffle 301 in the hollow part of the semi-enclosed transmission structure. Typically, in underwater wireless power transmission structures, because the conductivity of seawater is much greater than that of air and freshwater environments, eddy current losses parallel to the receiving coil will occur when the frequency of wireless power transmission exceeds 300 kHz in a seawater environment. By adding multiple thin plastic baffles, the flow path of eddy currents is blocked without affecting normal wireless power transmission, thereby reducing eddy current losses. Finally, the shell of the semi-enclosed structure is made of magnetic shielding material. Simulation verification shows that it can reduce electromagnetic losses and electromagnetic interference to the outside world.

[0023] The AUV device 103 includes a rectifier bridge circuit 207 and an AUV battery pack 211. The function of the rectifier bridge circuit 207 is to convert high-frequency alternating current into direct current, and then charge the AUV battery pack 211.

[0024] like Figures 2-4 The diagram shows a DTCWPT system based on dual transmitter loops, each equipped with a negative resistor. A resonant inverter provides high-frequency AC power to the corresponding transmitter coils at the same operating frequency. Each receiver is equipped with a rectifier bridge module to provide power for charging the AUV battery pack 211. The rectifier bridge module 207 includes a rectifier, wherein the equivalent resistance of the rectifier is R. Lr The basic voltage phase of the high-frequency inverter 205 can be expressed as:

[0025]

[0026] The equivalent self-inductance of the first transmitting coil 104, the second transmitting coil 106, and the receiving coil 105 is expressed as follows:

[0027]

[0028] Circuit parameters are typically determined by the following formula:

[0029]

[0030] Figure 2 The equivalent circuit of the proposed dual-coil wireless power transfer topology is illustrated. According to Kirchhoff's laws, for the transmitter:

[0031]

[0032]

[0033]

[0034]

[0035] Corresponding receiver:

[0036]

[0037] The input impedance of the inverter is expressed as:

[0038]

[0039] The active output power can be derived as follows:

[0040]

[0041]

[0042] The proposed system, derived from the above equations, doubles the system's output power. Output power is related to voltage U. DC and U O M t1r and M t2r Mutual inductance, filter inductance L f The steady-state solution of the DTCWPT system can be derived by treating the two-coil system as a linear system and applying the superposition theorem.

[0043] This is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dual launch coil underwater wireless power transfer structure for an AUV, characterized in that The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101).

2. The dual transmitting coil underwater wireless power transfer structure for AUV according to claim 1, wherein: The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device (103) connected to the power supply replenishment ship (101). The application relates to a power supply replenishment ship (101) and an AUV device

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