An underwater wireless charging system

Abstract

This invention provides an underwater wireless charging system, comprising: at least two transmitting circuits, wherein the phase difference between the transmitting currents of the at least two transmitting circuits is less than 90 degrees; at least two first resonant circuits electrically connected to each of the at least two transmitting circuits; a second resonant circuit corresponding to each of the at least two first resonant circuits; and a receiving circuit electrically connected to the second resonant circuit. The at least two transmitting circuits output AC voltage to their corresponding first resonant circuits. Each first resonant circuit converts the received AC voltage into an AC magnetic field, transferring energy to the second resonant circuit. The second resonant circuit converts the received energy into electrical energy and outputs it to the receiving circuit, which then charges the underwater target load. The gap between the first and second resonant circuits corresponding to each of the at least two transmitting circuits is 20-40 mm. This invention improves the efficiency of underwater wireless charging.

Description

Technical Field

[0001] This utility model relates to the field of wireless charging technology, and in particular to an underwater wireless charging system. Background Technology

[0002] Autonomous Underwater Vehicles (AUVs), with their high maneuverability, flexibility, and autonomous cruising capabilities, have become core equipment for underwater missions. Currently, AUVs primarily rely on recharging from their mothership or base and tethered charging for energy replenishment, but both methods have significant limitations. Most AUVs currently use wet-plug charging for underwater charging. While this method has relatively low hardware costs, it presents numerous problems in terms of operational continuity, safety, ease of operation, and maintenance costs. First, frequent retrieval and docking affect the continuity of AUV operations, increasing the number of mission interruptions and reducing work efficiency. Second, due to the high conductivity of water, wet-plug charging poses potential safety hazards such as electrical sparks, short circuits, and leakage. To ensure safety, the charging interface must maintain good sealing and insulation performance; however, after prolonged use, the sealing structure may degrade due to environmental factors, increasing the likelihood of system failure. Furthermore, during docking, the AUV needs to precisely insert and remove the charging port, and the watertight connectors require significant docking force, further increasing the complexity of the charging operation. In addition, watertight connectors are susceptible to water erosion and mechanical wear during frequent insertion and removal, which leads to a decline in sealing performance, reduced interface reliability, and ultimately a shortened service life and increased manual maintenance costs.

[0003] In summary, traditional cabled underwater charging methods are no longer sufficient to meet the needs of AUVs for long-term autonomous operation, safety, and high efficiency. Utility Model Content

[0004] The technical problem this invention aims to solve is to provide an underwater wireless charging system that can improve the efficiency and stability of underwater wireless charging.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: An underwater wireless charging system includes: The transmitting side circuit includes at least two transmitting circuits, the coils of the at least two transmitting circuits are arranged in parallel, and the phase difference between the transmitting currents of the at least two transmitting circuits is less than 90 degrees; and at least two first resonant circuits that are electrically connected to the at least two transmitting circuits in a one-to-one correspondence. A second resonant circuit corresponding to the at least two first resonant circuits; A receiving circuit electrically connected to the second resonant circuit; The at least two transmitting circuits output AC voltage to their corresponding first resonant circuits. Each first resonant circuit converts the received AC voltage into an AC magnetic field and transmits the energy to the second resonant circuit. The second resonant circuit converts the received energy into electrical energy and outputs it to the receiving circuit, which then charges the underwater target load. The gap between the first and second resonant circuits corresponding to each of the at least two transmitting circuits is 20-40 mm.

[0006] Optionally, each of the at least two transmitting circuits includes: The first capacitor connected in parallel with the DC power supply; A full-bridge inverter electrically connected to the first capacitor, wherein the full-bridge inverter is electrically connected to the first resonant circuit; The transmitter controller is electrically connected to the full-bridge inverter; In this circuit, the first capacitor filters the power supply voltage output from the DC power supply and inputs it into the full-bridge inverter. The transmitter controller outputs a pulse voltage signal to the full-bridge inverter. The full-bridge inverter converts the filtered power supply voltage into an AC voltage of the target frequency according to the pulse voltage signal and outputs it to the first resonant circuit. The first resonant circuit converts the AC voltage it receives into an AC magnetic field and transmits energy to the second resonant circuit.

[0007] Optionally, the full-bridge inverter includes: First field-effect transistor; A second field-effect transistor electrically connected to the drain of the first field-effect transistor; A third field-effect transistor electrically connected to the source of the first field-effect transistor; A fourth field-effect transistor is electrically connected to the source of the second field-effect transistor, and the source of the fourth field-effect transistor is electrically connected to the source of the third field-effect transistor.

[0008] Optionally, the transmission controller includes: A first pulse width modulator electrically connected to the first field-effect transistor; A second pulse width modulator electrically connected to the second field-effect transistor; A third pulse width modulator electrically connected to the third field-effect transistor; The fourth pulse width modulator is electrically connected to the fourth field-effect transistor; The first pulse width modulator, the second pulse width modulator, the third pulse width modulator, and the fourth pulse width modulator are all electrically connected to the first digital signal processor; The first digital signal processor outputs pulse control signals to the first pulse width modulator, the second pulse width modulator, the third pulse width modulator, and the fourth pulse width modulator, respectively, so that the first pulse width modulator outputs a first pulse voltage signal to the first field-effect transistor; the second pulse width modulator outputs a second pulse voltage signal to the second field-effect transistor; the third pulse width modulator outputs a third pulse voltage signal to the third field-effect transistor; and the fourth pulse width modulator outputs a fourth pulse voltage signal to the fourth field-effect transistor.

[0009] Optionally, the first resonant circuit includes: Second capacitor; A first inductor electrically connected to the second terminal of the second capacitor; A first resistor electrically connected to the first inductor; The first terminal of the second capacitor is connected between the first field-effect transistor and the third field-effect transistor; One end of the first resistor is connected to the second field-effect transistor and the fourth field-effect transistor. )between.

[0010] Optionally, the receiving circuit includes: A third capacitor electrically connected to the underwater target load; The rectifier is electrically connected to the third capacitor; A receiver controller electrically connected to the rectifier; A second resonant circuit electrically connected to the rectifier; The rectifier converts the AC power obtained by the second resonant circuit into DC power, and the third capacitor filters the DC power before inputting it to the underwater target load. The receiver controller controls the receiver circuit to be in constant current mode or constant voltage mode.

[0011] Optionally, the rectifier includes: First rectifier diode; A second rectifier diode electrically connected to the negative terminal of the first rectifier diode; A fifth field-effect transistor electrically connected to the positive terminal of the first rectifier diode; A sixth field-effect transistor is electrically connected to the positive terminal of the second rectifier diode, and the source of the sixth field-effect transistor is electrically connected to the source of the fifth field-effect transistor.

[0012] Optionally, the second resonant circuit includes: Fourth capacitor; A second inductor electrically connected to the fourth capacitor; a second resistor electrically connected to the second inductor; The first terminal of the fourth capacitor is connected between the second rectifier diode and the sixth field-effect transistor. One end of the second resistor is connected between the first rectifier diode and the fifth field-effect transistor.

[0013] Optionally, the receiving controller includes: A first signal modulator electrically connected to the gate of the fifth field-effect transistor; A second signal modulator electrically connected to the gate of the sixth field-effect transistor.

[0014] Optionally, both the first signal modulator and the second signal modulator are electrically connected to the second digital signal processor; The second digital signal processor outputs pulse control signals to the first signal modulator and the second signal modulator respectively, so that the first signal modulator outputs a fifth pulse voltage signal to the fifth field-effect transistor; and the second signal modulator outputs a sixth pulse voltage signal to the sixth field-effect transistor.

[0015] The above-mentioned technical solution of this utility model has at least the following technical effects: The underwater wireless charging system of this invention comprises at least two transmitting circuits with coils arranged in parallel, and the phase difference between the transmitting currents of the at least two transmitting circuits is less than 90 degrees. At least two first resonant circuits, each electrically connected to one of the at least two transmitting circuits, output AC voltage. Each first resonant circuit converts the received AC voltage into an AC magnetic field, transferring energy to a second resonant circuit. The second resonant circuit converts the received energy into electrical energy and outputs it to a receiving circuit, which then charges the underwater target load. The gap between the first resonant circuit of each of the at least two transmitting circuits and the second resonant circuit of the receiving circuit is 20-40 mm. This system can meet the wireless charging requirements of underwater devices and improve the efficiency and stability of underwater wireless charging. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the circuit structure of the underwater wireless charging system of this utility model; Figure 2 This is a schematic diagram of the specific circuit structure of the underwater wireless charging system of this utility model. Detailed Implementation

[0017] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0018] like Figure 1 As shown, an embodiment of this utility model proposes an underwater wireless charging system, comprising: The transmitting side circuit 11 includes at least two transmitting circuits, the coils of the at least two transmitting circuits are arranged in parallel, and the phase difference between the transmitting currents of the at least two transmitting circuits is less than 90 degrees; and at least two first resonant circuits are electrically connected to the at least two transmitting circuits in a one-to-one correspondence. The second resonant circuit 12 corresponds to the at least two first resonant circuits; The receiving circuit 13 is electrically connected to the second resonant circuit 12; The at least two transmitting circuits output AC voltage to their corresponding first resonant circuits. Each first resonant circuit converts the received AC voltage into an AC magnetic field and transmits the energy to the second resonant circuit 12. The second resonant circuit converts the received energy into electrical energy and outputs it to the receiving circuit 13, which charges the underwater target load 14. The gap between the first resonant circuit and the second resonant circuit 12 corresponding to each of the at least two transmitting circuits is 20~40mm.

[0019] In this embodiment, as Figure 1 As shown, there are at least two transmitting circuits, at least two first resonant circuits, a receiving circuit, and a second resonant circuit. The at least two first resonant circuits and the second resonant circuit are arranged correspondingly. Each transmitting circuit outputs an AC voltage to the corresponding first resonant circuit. The first resonant circuit converts the AC voltage into an AC magnetic field and uses electromagnetic induction or magnetic resonance coupling to replenish energy and transmit the energy to the second resonant circuit. The second resonant circuit converts the received energy into electrical energy and outputs it to the receiving circuit, which then charges the underwater target load 14. Preferably, the gap between the first resonant circuit of each transmitting circuit and the second resonant circuit of each receiving circuit is 20~40 mm, thereby ensuring that the energy generated by the alternating magnetic field in the underwater environment can be transferred to the second resonant circuit. The frequency of the resonant circuit is 85kHz. The coupling coefficient between the transmitting circuit and the receiving circuit is between 0.07 and 0.31, which can ensure the stable operation of the underwater target load battery in a dynamic environment. The resistance of the target load is 23mΩ. The phase difference between the transmitting currents of the at least two transmitting circuits is less than 90 degrees, which can ensure the energy transmission efficiency of the transmitting circuit 11.

[0020] The present invention achieves stable and efficient energy transmission of the underwater wireless charging system in dynamic environments through the cooperation of a full-bridge inverter, rectifier, first resonant circuit, and second resonant circuit, thereby improving the system's adaptability to complex underwater environments and enhancing dynamic response performance.

[0021] like Figure 2 As shown, in an optional embodiment of the present invention, each of the at least two transmitting circuits includes: With DC power supply The first capacitor in parallel ; With the first capacitor A fully bridge inverter electrically connected to a first resonant circuit; The transmitter controller is electrically connected to the full-bridge inverter; Wherein, the first capacitor DC power supply After the output power supply voltage is filtered, it is input to the full-bridge inverter. The transmitter controller outputs a pulse voltage signal to the full-bridge inverter. The full-bridge inverter converts the filtered power supply voltage into an AC voltage of the target frequency according to the pulse voltage signal and outputs it to the first resonant circuit. The first resonant circuit converts the AC voltage it receives into an AC magnetic field and transmits energy to the second resonant circuit 12.

[0022] In this embodiment, as Figure 2 As shown, in each transmitting circuit, such as the first transmitting circuit 111 and the second transmitting circuit 113, the first capacitor... With DC power supply Parallel connection, full-bridge inverter and first capacitor The transmitter controller is electrically connected to the full-bridge inverter in parallel, and the first capacitor is connected in parallel. DC power supply After filtering, the output supply voltage is input to the full-bridge inverter. The transmitter controller outputs a pulse voltage signal to the full-bridge inverter, which converts the filtered supply voltage into an AC voltage of the target frequency based on the pulse voltage signal and outputs it to the first resonant circuit. Specifically, the mutual inductance between the first resonant circuit 112 and the second resonant circuit 12 corresponding to the first transmitter circuit 111 is m1, with a value of 7.02~28.67 uH; the mutual inductance between the first resonant circuit 114 and the second resonant circuit 12 corresponding to the second transmitter circuit 113 is m2, with a value of 6.68~28.03 uH; the mutual inductance mt between the transmitter circuits is 1.5 uH. During charging, the system monitors the current of the transmitter-side circuit in real time and estimates the mutual inductance and load resistance. This ensures that maximum transmission efficiency is maintained under different coupling and load conditions.

[0023] like Figure 2 As shown, in an optional embodiment of the present invention, the full-bridge inverter includes: First field-effect transistor ; With the first field-effect transistor The second field-effect transistor with drain connection ; With the first field-effect transistor The third field-effect transistor with source-electrical connection ; With the second field-effect transistor The fourth field-effect transistor with source-to-electrical connection The fourth field-effect transistor The source and the third field-effect transistor The source electrode is connected.

[0024] In this embodiment, as Figure 2 As shown, the full-bridge inverter includes four field-effect transistors (FETs), the first FET... With the third field-effect transistor Series connection, second field-effect transistor With the fourth field-effect transistor Series connection, first field-effect transistor The drain and the second field-effect transistor The drain connection of the first field-effect transistor The source and the third field-effect transistor The drain connection of the second field-effect transistor The source and the fourth field-effect transistor The drain connection of the fourth field-effect transistor The source and the third field-effect transistor The source terminals are electrically connected; the full-bridge inverter converts the DC power supply... The direct current is converted into alternating current and transmitted to the first resonant circuit.

[0025] like Figure 2 As shown, in an optional embodiment of the present invention, the transmission controller includes: With the first field-effect transistor The first pulse width modulator connected electrically ; With the second field-effect transistor The second pulse width modulator is electrically connected. ; With the third field-effect transistor The third pulse width modulator connected electrically ; With the fourth field-effect transistor The fourth pulse width modulator connected electrically ; First pulse width modulator Second pulse width modulator Third pulse width modulator Fourth pulse width modulator All are electrically connected to the first digital signal processor; The first digital signal processor sends to the first pulse width modulator Second pulse width modulator Third pulse width modulator Fourth pulse width modulator Each outputs a pulse control signal, causing the first pulse width modulator to... To the first field-effect transistor Output the first pulse voltage signal; the second pulse width modulator To the second field-effect transistor The third pulse width modulator outputs a second pulse voltage signal. To the third field-effect transistor The third pulse voltage signal is output; the fourth pulse width modulator To the fourth field-effect transistor Output the fourth pulse voltage signal.

[0026] In this embodiment, as Figure 2 As shown, the first pulse width modulator With the first field-effect transistor The gate electrical connection, the second pulse width modulator With the second field-effect transistor The gate electrical connection, the third pulse width modulator With the third field-effect transistor Gate electrical connection, fourth pulse width modulator With the fourth field-effect transistor Gate electrical connection; first pulse width modulator Second pulse width modulator Third pulse width modulator Fourth pulse width modulator All are electrically connected to the first digital signal processor, receive control signals from the first digital signal processor, and control the transmitter controller according to the control signals to put the underwater wireless charging system into constant current mode or constant voltage mode. First pulse width modulator Second pulse width modulator Third pulse width modulator Fourth pulse width modulator Based on the changing trend of the transmitting circuit current, the first field-effect transistor is controlled separately. Second field-effect transistor Third field-effect transistor Fourth field-effect transistor By turning the inverter on and off at specific frequencies, the frequency of the AC voltage output from the full-bridge inverter is changed, and simultaneously, the frequency of the first field-effect transistor is changed. Second field-effect transistor Third field-effect transistor Fourth field-effect transistor The pulse width at which the inverter is activated is used to adjust the output voltage of the full-bridge inverter.

[0027] like Figure 2 As shown, in an optional embodiment of the present invention, the first resonant circuit includes: Second capacitor ; With the second capacitor The second terminal is electrically connected to the first inductor ; With the first inductor The first resistor of the electrical connection ; The second capacitor The first end is connected to the first field-effect transistor. and the third field-effect transistor between; The first resistor One end is connected to the second field-effect transistor and the fourth field-effect transistor between.

[0028] In this embodiment, as Figure 2 As shown, the first resonant circuit includes a first inductor. Second capacitor With the first inductor Series connection, first resistor With the first inductor Electrical connection, second capacitor The first end is connected to the first field-effect transistor. and the third field-effect transistor Between; First resistor One end is connected to the second field-effect transistor and the fourth field-effect transistor Between; the second capacitor It serves a compensating function, used to compensate for the first inductance. Self-inductance; first inductance Used to generate high-frequency alternating magnetic fields and emit magnetic field energy.

[0029] like Figure 2 As shown, in an optional embodiment of the present invention, the receiving circuit includes: With load resistance The third capacitor connected electrically ; and the third capacitor A rectifier electrically connected to the rectifier; a receiver controller electrically connected to the rectifier; and a second resonant circuit electrically connected to the rectifier. The rectifier converts the AC power obtained from the second resonant circuit into DC power, and the third capacitor... After filtering, the DC power is input to the underwater target load 14; the receiver controller controls the operating state of the receiver circuit.

[0030] In this embodiment, as Figure 2 As shown, in the receiving circuit, the third capacitor... With underwater target load 14 (i.e., resistor) The rectifier and the third capacitor are connected in parallel. The second resonant circuit is connected in parallel with the rectifier, and the receiving controller is connected in series with the second resonant circuit; the rectifier converts the high-frequency AC power obtained by the second resonant circuit into DC power, which is then passed through the third capacitor. The filtered output is sent to the underwater target load resistor. The receiver controller controls the operating state of the receiving circuit based on the voltage of the underwater target load 14.

[0031] like Figure 2 As shown, in an optional embodiment of the present invention, the rectifier includes: First rectifier diode ; With the first rectifier diode The second rectifier diode connected to the negative terminal ; With the first rectifier diode The fifth field-effect transistor with positive electrical connection ; With the second rectifier diode The sixth field-effect transistor with positive electrical connection The sixth field-effect transistor The source and the fifth field-effect transistor The source electrode is connected.

[0032] In this embodiment, as Figure 2 As shown, the rectifier of the receiving circuit includes a third capacitor. The first rectifier diode in parallel Fifth field-effect transistor With the first rectifier diode Series connection, second rectifier diode With the sixth field-effect transistor Series connection; first rectifier diode The negative terminal and the second rectifier diode The negative terminal is connected to the first rectifier diode. The positive electrode and the fifth field-effect transistor The drain connection of the second rectifier diode. The positive electrode and the sixth field-effect transistor The drain connection, the sixth field-effect transistor The source and the fifth field-effect transistor The source is electrically connected; the rectifier converts the high-frequency AC power obtained from the second resonant circuit into DC power.

[0033] like Figure 2 As shown, in an optional embodiment of the present invention, the second resonant circuit includes: Fourth capacitor ; With the fourth capacitor The second inductor connected electrically ; and the second inductor The second resistor connected electrically ; Wherein, the fourth capacitor The first end is connected to the second rectifier diode. and the sixth field-effect transistor between; The second resistor One end is connected to the first rectifier diode and the fifth field-effect transistor between.

[0034] In this embodiment, as Figure 2 As shown, the second resonant circuit includes a second inductor. Fourth capacitor With the second inductor Series connection, second resistor With the second inductor Series connection; the fourth capacitor The first end is connected to the second rectifier diode. and the fourth rectifier diode Between; the second resistor One end is connected to the first rectifier diode and the third rectifier diode Between; the fourth capacitor It serves a compensating function, used to compensate for the second inductance. Self-inductance; second inductance Used to receive the first inductor The generated energy is converted into electrical energy.

[0035] like Figure 2 As shown, in an optional embodiment of the present invention, the receiving controller includes: With the fifth field-effect transistor First signal modulator with gate electrical connection ; With the sixth field-effect transistor Second signal modulator with gate electrically connected .

[0036] In this embodiment, as Figure 2 As shown, the receiver controller includes a first signal modulator. Second signal modulator First signal modulator With the fifth field-effect transistor Gate electrical connection, second signal modulator With the sixth field-effect transistor Gate electrical connection.

[0037] like Figure 2 As shown, in an optional embodiment of the present invention, the first signal modulator Second signal modulator All are electrically connected to the second digital signal processor; The second digital signal processor sends signals to the first signal modulator. Second signal modulator The first signal modulator outputs pulse control signals respectively. To the fifth field-effect transistor Output the fifth pulse voltage signal; the second signal modulator To the sixth field-effect transistor Output the sixth pulse voltage signal.

[0038] In this embodiment, the first signal modulator Second signal modulator Both are electrically connected to the second digital signal processor; the second digital signal processor sends signals to the first signal modulator. Second signal modulator The first signal modulator outputs pulse control signals respectively. To the fifth field-effect transistor Output the fifth pulse voltage signal; the second signal modulator To the sixth field-effect transistor Output the sixth pulse voltage signal; first signal modulator Second signal modulator By controlling the fifth field-effect transistor separately Sixth field-effect transistor By turning the rectifier on and off at specific frequencies, the output frequency of the rectifier is changed, and the frequency of the fifth field-effect transistor is also changed. Sixth field-effect transistor The pulse width at which the circuit is activated is used to adjust the output voltage of the rectifier.

[0039] During the initial charging phase, the system continuously collects the current phase difference between multiple transmitters and adjusts the transmitter input voltage through perturbation to ensure that the current phase angle between multiple transmitters is less than 90°, thus optimizing the coupling state. It also continuously collects current and voltage data from the transmitters and estimates the system's mutual inductance ratio and load resistance. When the estimated receiver load resistance φ < φ_φ (target load resistance threshold), the system enters constant current charging mode. A maximum efficiency point tracking strategy is employed to adjust the optimal transmitter voltage ratio and receiver impedance, ensuring maximum efficiency output under different mutual inductance conditions. When the estimated receiver load resistance φ > φ_φ, the system enters constant voltage charging mode. Again, a maximum efficiency point tracking strategy is used to optimize the transmitter voltage ratio and receiver impedance, ensuring maximum energy transfer efficiency under different mutual inductance conditions.

[0040] The present invention, through the cooperation of a full-bridge inverter, rectifier, first resonant circuit, and second resonant circuit, can improve the adaptability of the underwater wireless charging system to complex underwater environments and enhance dynamic response performance, ensuring stable and efficient energy transmission in underwater dynamic environments, thereby improving the charging efficiency and reliability of the system.

[0041] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. An underwater wireless charging system, characterized in that, include: The transmitting side circuit (11) includes at least two transmitting circuits, the coils of the at least two transmitting circuits are arranged in parallel, and the phase difference between the transmitting currents of the at least two transmitting circuits is less than 90 degrees; and at least two first resonant circuits that are electrically connected to the at least two transmitting circuits in a one-to-one correspondence. A second resonant circuit (12) corresponding to the at least two first resonant circuits; The receiving circuit (13) is electrically connected to the second resonant circuit (12); The at least two transmitting circuits output AC voltage to their corresponding first resonant circuits. Each first resonant circuit converts the received AC voltage into an AC magnetic field and transmits the energy to the second resonant circuit (12). The second resonant circuit converts the received energy into electrical energy and outputs it to the receiving circuit (13). The receiving circuit charges the underwater target load (14). The gap between the first resonant circuit and the second resonant circuit (12) corresponding to each of the at least two transmitting circuits is 20~40mm.

2. The underwater wireless charging system according to claim 1, characterized in that, Each of the at least two transmitting circuits includes: With DC power supply ( The first capacitor connected in parallel ( ); With the first capacitor ( A full-bridge inverter electrically connected to a first resonant circuit; The transmitter controller is electrically connected to the full-bridge inverter; Wherein, the first capacitor ( DC power supply ( After the power supply voltage is filtered, it is input to the full-bridge inverter. The transmitter controller outputs a pulse voltage signal to the full-bridge inverter. The full-bridge inverter converts the filtered power supply voltage into an AC voltage of the target frequency according to the pulse voltage signal and outputs it to the first resonant circuit. The first resonant circuit converts the AC voltage it receives into an AC magnetic field and transmits the energy to the second resonant circuit (12).

3. The underwater wireless charging system according to claim 2, characterized in that, The full-bridge inverter includes: First field-effect transistor ( ); With the first field-effect transistor ( The second field-effect transistor with drain connection ( ); With the first field-effect transistor ( The third field-effect transistor with its source electrically connected ( ); With the second field-effect transistor ( The fourth field-effect transistor with source electrical connection ( The fourth field-effect transistor ( The source of the third field-effect transistor ( ) and the third field-effect transistor ( The source electrode is electrically connected.

4. The underwater wireless charging system according to claim 3, characterized in that, The transmission controller includes: With the first field-effect transistor ( The first pulse width modulator connected electrically ( ); With the second field-effect transistor ( The second pulse width modulator is electrically connected. ); With the third field-effect transistor ( The third pulse width modulator connected electrically ( ); With the fourth field-effect transistor ( The fourth pulse width modulator connected electrically ( ); The first pulse width modulator ( ), second pulse width modulator ( ), third pulse width modulator ( ), fourth pulse width modulator ( All of them are electrically connected to the first digital signal processor; The first digital signal processor sends signals to the first pulse width modulator ( ), second pulse width modulator ( ), third pulse width modulator ( ), fourth pulse width modulator ( ) respectively output pulse control signals, so that the first pulse width modulator ( ) to the first field-effect transistor ( The first pulse voltage signal is output by the second pulse width modulator; ) to the second field-effect transistor ( The third pulse width modulator outputs a second pulse voltage signal; ) to the third field-effect transistor ( The third pulse voltage signal is output by the fourth pulse width modulator. ) to the fourth field-effect transistor ( Output the fourth pulse voltage signal.

5. The underwater wireless charging system according to claim 4, characterized in that, The first resonant circuit includes: Second capacitor ( ); With the second capacitor ( The second terminal of the first inductor is electrically connected to the second terminal of the first inductor. ); With the first inductor ( The first resistor in the electrical connection ( ); The second capacitor ( The first end of ) is connected to the first field-effect transistor ( ) and the third field-effect transistor ( )between; The first resistor ( One end of the transistor is connected to the second field-effect transistor. ) and the fourth field-effect transistor ( )between.

6. The underwater wireless charging system according to claim 1, characterized in that, The receiving circuit (13) includes: The third capacitor (14) is electrically connected to the underwater target load. ); With the third capacitor ( ) The rectifier is electrically connected; A receiver controller electrically connected to the rectifier; A second resonant circuit electrically connected to the rectifier; The rectifier converts the AC power obtained by the second resonant circuit into DC power, and the third capacitor ( After filtering the DC power, it is input to the underwater target load (14); the receiving controller controls the receiving circuit to be in constant current mode or constant voltage mode.

7. The underwater wireless charging system according to claim 6, characterized in that, The rectifier includes: First rectifier diode ( ); With the first rectifier diode ( The second rectifier diode connected to the negative terminal ( ); With the first rectifier diode ( The fifth field-effect transistor with positive electrode connection ( ); With the second rectifier diode ( The sixth field-effect transistor with positive electrical connection ( The sixth field-effect transistor ( The source of the fifth field-effect transistor ( ) The source electrode is electrically connected.

8. The underwater wireless charging system according to claim 7, characterized in that, The second resonant circuit includes: Fourth capacitor ( ); With the fourth capacitor ( The second inductor connected electrically ( ); and the second inductor ( The second resistor connected electrically ( ); Among them, the fourth capacitor ( The first terminal of ) is connected to the second rectifier diode ( ) and the sixth field-effect transistor ( )between; The second resistor ( One end of the diode is connected to the first rectifier diode. ) and the fifth field-effect transistor ( )between.

9. The underwater wireless charging system according to claim 7, characterized in that, The receiving controller includes: With the fifth field-effect transistor ( The first signal modulator with gate electrically connected ( ); With the sixth field-effect transistor ( The second signal modulator with gate electrically connected ( ).

10. The underwater wireless charging system according to claim 9, characterized in that, The first signal modulator ( ), second signal modulator ( All of them are electrically connected to the second digital signal processor; The second digital signal processor sends signals to the first signal modulator ( ), second signal modulator ( ) respectively output pulse control signals, so that the first signal modulator ( ) to the fifth field-effect transistor ( The second signal modulator outputs the fifth pulse voltage signal; ) to the sixth field-effect transistor ( Output the sixth pulse voltage signal.

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