Underwater integrated high-power wireless power transmission system

Abstract

An underwater integrated high-power wireless power transmission system of the present invention comprises a transmitting end and a receiving end, the transmitting end and the receiving end each comprise a sealed shell, a printed board assembly, a coupling coil and an electromagnetic shielding assembly, the printed board assembly, the coupling coil and the electromagnetic shielding assembly are arranged in the sealed shell, and the electromagnetic shielding assembly comprises a shielding aluminum plate and a ferrite magnetic core. The shielding aluminum plate divides the sealing shell into an upper cavity and a lower cavity, the printed board assembly is fixed in the upper cavity, the coupling coil is fixed in the lower cavity, and the coupling coil and the printed board assembly are connected through a wire penetrating through the shielding aluminum plate. The ferrite magnetic core clings to the back of the coupling coil; the upper cavity is a metal cavity, the lower cavity is a non-metal cavity, and at least part of the shielding aluminum plate is connected with the inner wall of the metal cavity. The transmitting end and the receiving end are integrally designed, so that the problems of high cost and staggered operation reliability caused by separated design are solved; and the problem of failure of a control circuit system caused by electromagnetic field radiation generated by a coupling coil in an integrated design is also solved.

Description

Technical Field

[0001] The present invention belongs to the field of wireless charging technology, and relates to wireless energy replenishment of underwater equipment such as unmanned underwater vehicles (UUVs) and underwater remotely operated robots (ROVs), and specifically to an underwater integrated high-power wireless power transmission system. Background Art

[0002] With the development of technology, the available resources and strategic significance of the ocean have gradually gained attention. At present, my country has begun to develop the layout of the seabed monitoring network and underwater space station. In the underwater environment, underwater equipment is usually required to perform tasks such as seabed topography exploration, patrol, and maintenance, so the energy supply of underwater equipment is crucial. Traditional underwater equipment uses wired charging. When the battery is low, the battery needs to be removed and connected to the charger. There are disadvantages such as easy wear of the contact points, inconvenient operation, and repeated salvage of underwater equipment. In order to realize automatic charging of underwater equipment, improve flexibility and convenience, and reduce human intervention, wireless charging can be used as an alternative.

[0003] During the wireless transmission of electric energy, the coupling coil will generate large electromagnetic radiation, which will affect the normal operation of various components in the circuit around the coil. In addition, when high-frequency current passes through the coupling coil, a certain loss will also be generated and dissipated outward in the form of heat. When the heat accumulation is more serious, it will also affect the normal operation of the components. In order to avoid the above two problems, the current wireless power transmission technology mostly adopts a separate structure in which the coupling coil and the control circuit are placed in different shells. Therefore, both the coupling coil and the control circuit need to be designed with a shell structure with high pressure resistance and sealing performance to ensure the normal operation of the system. At the same time, additional watertight cables need to be designed to connect the coupling coil and the control circuit. Ultimately, the overall cost of the separated underwater wireless transmission component is higher, and because of its more complex structure, the reliability during operation will also be affected to a certain extent. Summary of the invention

[0004] In order to solve the above problems, the present invention provides an underwater integrated high-power wireless power transmission system, which integrates the power circuit and the receiving circuit of the transmitting end and the receiving end into a printed circuit board assembly and a coupling coil connected to the printed circuit board assembly, places the above printed circuit board assembly and the coupling coil in a sealed shell, and realizes shielding between the printed circuit board assembly and the coupling coil and good heat conduction between the chamber where the coupling coil is located and the sealed shell through an electromagnetic shielding assembly.

[0005] The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. According to an underwater integrated high-power wireless power transmission system proposed by the present invention, it includes a transmitter and a receiver, and the transmitter and the receiver both include a sealed shell and a printed circuit board assembly, a coupling coil and an electromagnetic shielding assembly arranged in the sealed shell, and the electromagnetic shielding assembly includes a shielding aluminum plate and a ferrite core, and the shielding aluminum plate divides the sealed shell into two upper and lower cavities, wherein the printed circuit board assembly is fixed in the upper cavity, and the coupling coil is fixed in the lower cavity, and the wire passing through the shielding aluminum plate realizes the connection between the coupling coil and the printed circuit board assembly; the ferrite core is arranged close to the back of the coupling coil; the upper cavity is a metal cavity, and the lower cavity is a non-metal cavity, and the shielding aluminum plate is at least partially connected to the inner wall of the metal cavity.

[0006] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0007] In the aforementioned integrated underwater high-power wireless power transmission system, the shielding aluminum plate and the printed circuit board assembly are arranged at intervals in the sealed housing.

[0008] In the aforementioned underwater integrated high-power wireless power transmission system, the upper cavity is surrounded by a cylindrical metal shell and a metal end cover fixed on the top of the metal shell, and the lower cavity is formed by a non-metallic bottom shell.

[0009] In the aforementioned integrated underwater high-power wireless power transmission system, the edge of the metal end cover protrudes out of the metal shell.

[0010] In the aforementioned integrated underwater high-power wireless power transmission system, the printed circuit board components at the transmitting end and the receiving end are integrated with a control circuit and a power circuit except for the coupling coil.

[0011] The aforementioned underwater integrated high-power wireless power transmission system, the power circuit of the transmitting end includes a voltage stabilizing protection circuit, a high-frequency inverter circuit, a high-frequency transformer, a resonant compensation circuit and a transmitting coil connected in sequence, wherein the voltage stabilizing protection circuit is used to perform surge protection on the input DC power while realizing real-time monitoring of voltage and current; the high-frequency inverter circuit is used to convert DC power into high-frequency AC power; the high-frequency transformer is used to realize the voltage boost and current reduction of high-frequency AC power; the resonant compensation circuit is used to compensate for the system reactive power; the transmitting coil is used to transfer electricity to the receiving end components.

[0012] The aforementioned underwater integrated high-power wireless power transmission system, the power circuit at the receiving end includes a receiving coil, a resonant compensation circuit, an uncontrolled rectifier circuit and a BUCK circuit connected in sequence, wherein the receiving coil is used to receive the electric energy transmitted by the transmitting end, the resonant compensation circuit is used to compensate for the system reactive power, the uncontrolled rectifier circuit is used to convert high-frequency AC power into DC power, and the BUCK circuit is used to adjust the voltage of the DC power and transmit it to the load.

[0013] The aforementioned underwater integrated high-power wireless power transmission system has the same control circuits at the transmitting and receiving ends, both of which include a DC / DC level conversion module, an MCU, and a driver chip. The DC / DC modules are powered off from the power circuit and supply power to the MCU and the driver chip, and the MCU sends signals to the driver chip.

[0014] In the aforementioned underwater integrated high-power wireless power transmission system, the DC / DC level conversion module at the transmitting end uses the DC power processed by the voltage stabilizing protection circuit, and at the receiving end, the DC / DC level conversion module uses the DC power converted by the uncontrolled rectifier circuit.

[0015] In the aforementioned underwater integrated high-power wireless power transmission system, at the transmitting end, the driver chip drives the high-frequency inverter circuit to convert DC power into AC power; at the receiving end, the driver chip drives the BUCK circuit to convert the DC power of the power circuit into DC power of the required voltage.

[0016] Compared with the prior art, the present invention has obvious advantages and beneficial effects. By means of the above technical solution, the present invention can achieve considerable technical advancement and practicality, and has wide industrial utilization value, and has at least the following advantages:

[0017] The present invention can realize the integrated design of the coupling coil and the control circuit, thereby effectively avoiding the high cost and operational reliability problems brought about by the traditional separate design; the present invention can solve the problem that the coupling coil in the integrated design generates electromagnetic field radiation during the power transmission process, thereby affecting the normal operation of the control circuit and causing system failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the overall control topology diagram of the underwater integrated high-power wireless power transmission system of the present invention;

[0019] Figure 2 The figure is a schematic diagram of the structure of the transmitting end of the underwater integrated high-power wireless power transmission system of the present invention.

[0020]

Main component symbol description

[0021] 1:Metal end cap

[0022] 2: Metal shell

[0023] 3: Non-metallic bottom shell

[0024] 4: Transmitter printed circuit board assembly

[0025] 5: Shielding aluminum plate

[0026] 6: Ferrite core

[0027] 7: Transmitting coil

[0028] 8: Wire DETAILED DESCRIPTION

[0029] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation method, structure, characteristics and effects of the underwater integrated high-power wireless power transmission system proposed by the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0030] See also Figure 1 and Figure 2 , which is a schematic diagram of the structure of the various parts of the underwater integrated high-power wireless power transmission system of the present invention. The transmission system includes a transmitting end and a receiving end, wherein the transmitting end is generally installed on a mother ship or an underwater energy base station, and the receiving end is generally installed on a UUV and a ROV.

[0031] The transmitting end includes a sealed housing and a transmitting end component located in the sealed housing, and the receiving end includes a sealed housing and a receiving end component located in the sealed housing. The transmitting end component and the receiving end component both include a control circuit and a power circuit, wherein the power circuit part is used to realize the transmission of wireless energy, and the control circuit is used to control the transmission of electric energy.

[0032] The transmitter power circuit includes voltage stabilization protection circuit, high-frequency inverter circuit, high-frequency transformer, resonant compensation circuit and transmitter coil. The DC power input into the transmitter power circuit first passes through the voltage stabilization protection circuit for surge protection and realizes real-time monitoring of voltage and current; secondly, it is converted into high-frequency AC square wave through the high-frequency inverter circuit; then it passes through the high-frequency transformer for voltage boost and current reduction, and then it passes through the resonant compensation circuit to reduce its reactive power; finally, the power is transferred to the receiving end components through the transmitter coil.

[0033] The receiving end power circuit includes receiving coil, resonant compensation circuit, uncontrolled rectifier circuit and BUCK circuit. After receiving the electric energy transmitted by the transmitting end, the receiving coil first passes through the resonant compensation circuit to reduce its reactive power, then passes through the uncontrolled rectifier circuit to convert the high-frequency AC power into DC power, and finally passes through the BUCK circuit to convert it into DC power of the required voltage and output it to the load.

[0034] The transmitting end control loop is consistent with the receiving end control loop, and both include a DC / DC level conversion module, an MCU, and a driver chip. In order to avoid the use of additional low-voltage power supply cables, the control loop of the present invention chooses to draw power from the main power circuit to realize the power supply of the MCU and the driver chip. The direct current input by the power circuit is converted into direct current of the corresponding voltage by the DC / DC module to power the driver chip and the MCU. At the transmitting end, the MCU sends a PWM signal to the driver chip to drive the high-frequency inverter circuit to convert direct current power into alternating current power to control the transmission of power; at the receiving end, the MCU sends a signal to the driver chip to drive the BUCK circuit to convert the direct current of the power circuit into direct current power of the required voltage and output it to the load.

[0035] The components of the transmitter power circuit except the transmitter coil and the transmitter control circuit are integrated on the printed circuit board to form a transmitter printed circuit board assembly 4, that is, the transmitter assembly composed of the transmitter power circuit and the transmitter control circuit of the present invention includes a transmitter coil 7 and a transmitter printed circuit board assembly 4 in terms of hardware structure, and the transmitter coil 7 and the transmitter printed circuit board assembly 4 are connected by a wire 8.

[0036] The receiving end power circuit except the receiving coil and the receiving end control circuit are also integrated on the corresponding printed circuit board to form a receiving end printed circuit board assembly. That is, the receiving end assembly composed of the receiving end power circuit and the receiving end control circuit of the present invention includes a receiving coil and a receiving end printed circuit board assembly in terms of hardware structure, and the receiving coil and the receiving end printed circuit board assembly are connected by wires.

[0037] The transmitting end and the receiving end sealed shell are both provided with an electromagnetic shielding component, which includes a shielding aluminum plate 5 and a ferrite core 6, wherein the shielding aluminum plate 5 divides the sealed shell into two upper and lower cavities, wherein the transmitting end printed circuit board assembly 4 is located in the upper cavity of the transmitting end sealed shell and keeps a distance from the shielding aluminum plate 5, and the transmitting coil is located in the lower cavity of the transmitting end sealed shell; the receiving end printed circuit board assembly is located in the upper cavity of the receiving end sealed shell and keeps a distance from the shielding aluminum plate, and the receiving coil is located in the lower cavity of the receiving end sealed shell.

[0038] In the lower cavity of the sealed shell of the transmitting end, the ferrite core 6 is arranged close to the back of the transmitting coil to guide the conduction direction of the magnetic field radiated by the transmitting coil. The shielding aluminum plate 5 is used to shield the magnetic field leaked from the transmitting coil 7, and the shielding aluminum plate 5 is also provided with a through hole for the wire to pass through. The wire 8 passing through the through hole realizes the connection between the transmitting coil 7 and the transmitting end printed circuit board assembly 4.

[0039] In the lower cavity of the sealed shell at the receiving end, a ferrite core is arranged close to the back of the receiving coil to guide the conduction direction of the magnetic field radiated by the receiving coil. The shielding aluminum plate is used to shield the magnetic field leaked from the receiving coil, and the shielding aluminum plate is also provided with a through hole for the wire to pass through. The wire passing through the through hole realizes the connection between the receiving coil and the receiving end printed circuit board assembly.

[0040] The transmitting end sealed housing and the receiving end sealed housing have the same structure. The side walls and bottom of the lower cavity of the transmitting end sealed housing are made of non-metallic materials. In the embodiment of the present invention, the lower cavity of the transmitting end sealed housing is located in a non-metallic bottom shell 3 with an open upper end. The upper cavity of the transmitting end sealed housing is a metal cavity with a closed upper end and an open lower end. The metal cavity includes a metal shell 2 with open ends, extending in the up and down directions, and in a cylindrical shape. A metal end cover 1 is also sealed and fixed on the top of the metal shell 2, and the radial dimension of the metal end cover 1 is larger than the radial dimension of the metal shell 2, so that the outer edge of the metal end cover 1 protrudes from the metal shell 2, forming a convex edge structure that is easy to fix. The lower end surface of the metal shell 2 and the upper end surface of the non-metallic bottom shell 3 are sealed and connected, thereby realizing the sealing of the transmitting end sealed housing.

[0041] In an embodiment of the present invention, the outer circumference of the shielding aluminum plate 5 is sealed and connected to the inner circumference of the lower end of the metal shell 2, while in another embodiment of the present invention, the upper end of the outer circumference of the shielding aluminum plate 5 is connected to the inner circumference of the metal shell 2, and the lower end of the outer circumference of the shielding aluminum plate is connected to the inner circumference of the non-metal bottom shell 3. That is, the outer circumference of the shielding aluminum plate 5 of the present invention is at least partially connected to the metal shell 2, so that the heat generated by the heating of the coil in the lower cavity can be transferred to the metal shell 2 through the shielding aluminum plate, and then the metal shell 2 performs heat exchange with the external liquid, thereby solving the problem of the influence of the heat accumulation of the coil on the printed circuit board assembly.

[0042] The transmitting end and the receiving end of the wireless charging system of the present invention are both configured as a structure composed of a printed circuit board assembly and a coupling coil, and the structure is placed in a sealed shell. The sealed shell protects the internal components of the system to achieve underwater sealing and water pressure resistance. At the same time, an electromagnetic shielding assembly is also arranged in the sealed shell. The ferrite core in the electromagnetic shielding assembly is tightly attached to the back of the coupling coil to guide the conduction direction of the magnetic field radiated by the magnetic coupling mechanism; a shielding aluminum plate is installed between the ferrite core and the printed circuit board assembly to shield the electric field leaked from the coupling coil, thereby achieving electromagnetic shielding isolation between the printed circuit board assembly and the coupling coil, and ensuring that the printed circuit board assembly is not affected by the magnetic field of the coupling coil.

[0043] The sealed shell of the present invention is divided into an upper metal cavity and a lower non-metal cavity by a shielded aluminum plate, which meets the setting requirements of the coupling coil and the printed circuit board assembly. At the same time, the shielded aluminum plate separates the coupling coil and the printed circuit board assembly, so that the high-heat-generating structure coupling coils at the transmitting end and the receiving end and other components are distributed in two different sealed cavities, avoiding the influence of the high heat of the coupling coil on other components. At the same time, the shielded aluminum plate can not only shield the electric field leaked by the coupling coil, but also realize heat conduction through contact with the metal cavity wall, thereby realizing the exchange of heat in the non-metal cavity below with the outside world, and realizing the cooling of the coupling coil.

[0044] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An underwater integrated high-power wireless power transmission system, comprising a transmitting end and a receiving end, characterized in that: The transmitting end and the receiving end both include a sealed shell and a printed circuit board assembly, a coupling coil and an electromagnetic shielding assembly arranged in the sealed shell. The electromagnetic shielding assembly includes a shielding aluminum plate and a ferrite core. The shielding aluminum plate divides the sealed shell into two upper and lower cavities, wherein the printed circuit board assembly is fixed in the upper cavity, and the coupling coil is fixed in the lower cavity. The wire passing through the shielding aluminum plate realizes the connection between the coupling coil and the printed circuit board assembly; the ferrite core is arranged closely to the back of the coupling coil; the upper cavity is a metal cavity, the lower cavity is a non-metal cavity, and the shielding aluminum plate is at least partially connected to the inner wall of the metal cavity.

2. The underwater integrated high-power wireless power transmission system according to claim 1, characterized in that: The shielding aluminum plate and the printed circuit board assembly are arranged at intervals in the sealed housing.

3. The underwater integrated high-power wireless power transmission system according to claim 1 or 2, characterized in that: The upper cavity is surrounded by a cylindrical metal shell and a metal end cover fixed on the top of the metal shell, and the lower cavity is formed by a non-metal bottom shell.

4. The underwater integrated high-power wireless power transmission system according to claim 3 is characterized in that: The edge of the metal end cover protrudes out of the metal shell.

5. The underwater integrated high-power wireless power transmission system according to claim 3 is characterized in that: The printed circuit board components of the transmitting end and the receiving end are both integrated with a control circuit and a power circuit except the coupling coil.

6. The underwater integrated high-power wireless power transmission system according to claim 5, characterized in that: The power circuit of the transmitting end includes a voltage stabilizing protection circuit, a high-frequency inverter circuit, a high-frequency transformer, a resonant compensation circuit and a transmitting coil connected in sequence, wherein the voltage stabilizing protection circuit is used to perform surge protection on the input DC power and realize real-time monitoring of voltage and current; the high-frequency inverter circuit is used to convert DC power into high-frequency AC power; the high-frequency transformer is used to realize the voltage boost and current reduction of high-frequency AC power; the resonant compensation circuit is used to compensate for the system reactive power; and the transmitting coil is used to transfer electricity to the receiving end components.

7. The underwater integrated high-power wireless power transmission system according to claim 6, characterized in that: The power circuit of the receiving end includes a receiving coil, a resonant compensation circuit, an uncontrolled rectifier circuit and a BUCK circuit connected in sequence, wherein the receiving coil is used to receive the electric energy transmitted by the transmitting end, the resonant compensation circuit is used to compensate for the system reactive power, the uncontrolled rectifier circuit is used to convert high-frequency AC power into DC power, and the BUCK circuit is used to adjust the voltage of DC power and transmit it to the load.

8. The underwater integrated high-power wireless power transmission system according to claim 7, characterized in that: The control circuits of the transmitter and receiver are the same, both including a DC / DC level conversion module, an MCU, and a driver chip. The DC / DC modules are powered from the power circuit and supply power to the MCU and the driver chip, and the MCU sends a signal to the driver chip.

9. The underwater integrated high-power wireless power transmission system according to claim 8, characterized in that: At the transmitting end, the DC / DC level conversion module uses the DC power processed by the voltage stabilization protection circuit, and at the receiving end, the DC / DC level conversion module uses the DC power converted by the uncontrolled rectifier circuit.

10. The underwater integrated high-power wireless power transmission system according to claim 8, characterized in that: At the transmitting end, the driver chip drives the high-frequency inverter circuit to convert DC power into AC power; at the receiving end, the driver chip drives the BUCK circuit to convert the DC power of the power circuit into DC power of the required voltage.

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