Wireless coupling device and system for realizing cross-metal energy transfer by using relay coil

Abstract

The invention relates to a wireless coupling device and system for realizing cross-metal energy transfer by using a relay coil, the wireless coupling device comprises a transmitting part, a relay part and a receiving part from bottom to top, and the transmitting coil of the transmitting part sleeves the inner side of a metal base; the relay part comprises a metal connecting seat, a relay receiving coil and a relay transmitting coil, the relay receiving coil is arranged at the bottom of the metal connecting seat, the relay transmitting coil is arranged at the top of the metal connecting seat, the relay receiving coil is connected with the relay transmitting coil through a wire, and the bottom of the metal connecting seat is inserted into the inner side of the metal base; the relay receiving coil is coupled with the transmitting coil; the receiving part comprises a non-metal shell and a receiving coil in the non-metal shell, the relay transmitting coil is coupled with the receiving coil, and electric energy and data of the transmitting coil are transmitted to the receiving coil.

Description

Technical Field

[0001] The present invention belongs to the technical field of magnetic coupling wireless charging and near-field magnetic coupling communication, and specifically relates to a wireless coupling device and system for realizing cross-metal energy transmission by using a relay coil. Background Art

[0002] The synchronous transmission technology of wireless power and data has received more and more attention in the field of unmanned systems and intelligent equipment applications. The wireless charging system can realize non-contact power replenishment, thereby realizing power replenishment under unmanned operation conditions. At the same time, the battery as the load end needs to transmit charging information to the system in a timely manner to ensure the stability and reliability of the charging process. Therefore, the synchronous transmission technology of wireless power and data is very important. At present, for conventional wireless charging devices, the distance of power transmission is limited by the diameter of the coupling device coil, and the ratio of the two is generally low, so that when the volume of the wireless charging device is constrained (that is, the coil diameter of the coupling device is constrained), the charging distance of the system will also be limited, which is not conducive to power transmission at a slightly longer distance. In addition, wireless charging devices are generally made of metal, and metal will reflect electromagnetic waves, making common wireless communication modules unable to work normally, thereby affecting the quality of conventional signal transmission. Summary of the invention

[0003] In view of the above problems, the present invention provides a wireless coupling device and system for realizing cross-metal energy transmission using a relay coil. In a first aspect, the wireless coupling device comprises a transmitting part, a relay part and a receiving part from bottom to top, and the transmitting coil of the transmitting part is sleeved on the inner side of the metal base;

[0004] The relay part includes a metal connection seat, a relay receiving coil and a relay transmitting coil. The relay receiving coil is arranged at the bottom of the metal connection seat, and the relay transmitting coil is arranged at the top of the metal connection seat. The relay receiving coil and the relay transmitting coil are connected by a wire. The bottom of the metal connection seat is inserted into the inner side of the metal base, so that the relay receiving coil and the transmitting coil are coupled.

[0005] The receiving part includes a non-metallic shell and a receiving coil inside thereof. The relay transmitting coil is coupled with the receiving coil to transfer the electric energy and data of the transmitting coil to the receiving coil.

[0006] Traditional wireless coupling charging devices directly couple the transmitting coil with the receiving coil to transfer electrical energy from the transmitting coil to the receiving coil. The transmitting coil is generally installed on the ground or other charging platforms. The volume / area of ​​the transmitting coil is limited by the area of ​​the ground or charging platform and cannot be too large. The receiving coil is generally installed on the electrical equipment, and in order to obtain higher energy transmission efficiency, the receiving coil (i.e. the electrical equipment) cannot be too far away from the transmitting coil. The outer shell of the electrical equipment is mostly metal, which will reflect electromagnetic waves and affect the transmission quality of the wireless communication signal of the coupling charging device.

[0007] The present invention sets a relay part between the transmitting coil and the receiving coil. The height of the relay part can be adjusted according to the distance between the receiving coil and the transmitting coil, so that the distance between the electrical equipment and the charging platform is no longer limited. The relay receiving coil at the bottom of the relay part is coupled with the transmitting coil to receive the energy and data of the transmitting coil. The relay receiving coil is connected to the relay transmitting coil through a wire. The relay transmitting coil is coupled with the receiving coil to transfer energy and data to the receiving coil. The data transmission is transmitted through the above two couplings and wires and is not affected by metal.

[0008] Optionally, the transmitting part includes a transmitting coil, a metal base and a flexible ferrite 1, the transmitting coil, the metal base and the flexible ferrite 1 are uniformly circular and concentrically arranged, the flexible ferrite 1 is arranged on the inner wall of the metal base, the transmitting coil is uniformly wound on the inner side surface of the flexible ferrite 1, and the flexible ferrite 1 constrains the magnetic field generated by the transmitting coil to enhance the coupling capability between the transmitting coil and the relay receiving coil.

[0009] Further optionally, the metal base includes a vertical wire groove ring 1 and a horizontal support plate, the wire groove ring 1 is circular, the support plate is annular, the bottom of the wire groove ring 1 is fixedly connected to the inner ring of the support plate, and a number of through holes are evenly arranged on the support plate, so that the metal base can be fixed to the charging platform by screws or bolts.

[0010] Further optionally, the height of the flexible ferrite 1 is equal to the height of the transmitting coil, so that the flexible ferrite 1 can fully cover the transmitting coil, thereby improving the magnetic field confinement capability.

[0011] Optionally, the metal connection seat is cylindrical as a whole, and includes a lower support seat, a center column and an upper support groove which are concentrically arranged from bottom to top. The outer diameters of the center column, the upper support groove and the lower support seat gradually increase. A second wire groove ring is provided at the bottom of the lower support seat for setting a relay receiving coil. The center column is hollow and can accommodate the wire passing through the center column, while reducing the weight of the metal connection seat.

[0012] The bottom of the upper supporting groove is communicated with the inner space of the central column, and the relay transmitting coil is arranged on the inner wall of the upper supporting groove.

[0013] Further optionally, the lower support seat includes a horizontal support plate and a vertical structural ring, the support plate is circular and is arranged at the lower part of the lower support seat, and a circular structural ring is provided on the outer edge of the support plate. The support plate divides the internal space of the structural ring into two parts, an upper part and an lower part, and a plurality of upper reinforcing ribs are provided on the inner wall of the upper structural ring, and are evenly arranged along the circumference of the structural ring; a plurality of lower reinforcing ribs are provided on the inner wall of the lower structural ring, and are evenly arranged along the circumference of the structural ring.

[0014] Further optionally, a second wire groove ring is provided on the outer side surface of the bottom of the structural ring below the support plate, the second wire groove ring is recessed into the inner part of the downward support seat, a circle of flexible ferrite 2 is wound around the outer side surface of the second wire groove ring, and a relay receiving coil is evenly wound around the outer side surface of the second flexible ferrite; the height of the second flexible ferrite is equal to the height of the relay receiving coil, so that the second flexible ferrite can fully cover the relay receiving coil, thereby improving the magnetic field confinement capability;

[0015] During charging, the second wire groove circle is placed inside the first wire groove circle, so that the transmitting coil and the relay receiving coil are directly opposite to each other, and there is a gap between the transmitting coil and the relay receiving coil for coupling to transfer electrical energy and communication data.

[0016] Optionally, a through hole is provided on the bottom surface of the upper support groove for connecting to the central column; the diameter of the through hole of the upper support groove is smaller than the inner diameter of the upper support groove, so that a circle of platform is provided between the vertical side wall of the upper support groove and the through hole for placing the relay transmitting coil;

[0017] A circle of flexible ferrite three is provided on the inner side of the vertical side wall of the upper support groove, and the relay transmitting coil is evenly wound on the inner side of the flexible ferrite three; the height of the flexible ferrite three is not less than the height of the relay transmitting coil, so that the flexible ferrite three can fully cover the relay transmitting coil and improve the magnetic field confinement capability.

[0018] Optionally, the two ends of the relay transmitting coil are on the same vertical line, and the two ends of the relay receiving coil are on the same vertical line; the starting end of the relay transmitting coil is connected to the starting end of the relay receiving coil through wire 1, and the end of the relay transmitting coil is connected to the end of the relay receiving coil through wire 2; the center column accommodates wire 1 and wire 2 to pass through.

[0019] Optionally, the non-metallic shell of the receiving part is cylindrical; a flexible ferrite four is provided on the inner wall of the vertical side of the non-metallic shell, and a receiving coil is evenly wound on the inner side of the flexible ferrite four.

[0020] In a second aspect, the present invention provides a wireless coupling system for realizing cross-metal energy transmission using a relay coil, including a DC power supply, an inverter circuit, a resonant compensation network and a rectifier circuit, wherein the inverter circuit is a full-bridge inverter, and the resonant compensation network adopts bilateral series compensation, including a compensation circuit 1 and a compensation circuit 2, wherein the compensation circuit 1 is connected to the inverter circuit, and the compensation circuit 2 is connected to the rectifier circuit, and the rectifier circuit adopts a full-bridge rectifier;

[0021] The transmitting coil of the wireless coupling device for realizing cross-metal energy transmission by using a relay coil is connected to the compensation circuit 1, and the receiving coil is connected to the compensation circuit 2; the relay unit is provided between the compensation circuit 1 and the compensation circuit 2;

[0022] The first compensation circuit is connected to the data injection circuit, and the second compensation circuit is connected to the data extraction circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a wireless coupling device for realizing cross-metal energy transfer using a relay coil;

[0024] Figure 2 It is an exploded schematic diagram of the launch unit;

[0025] Figure 3 It is a schematic diagram of the relay unit;

[0026] Figure 4 is a schematic diagram of a receiving unit;

[0027] Figure 5 It is a schematic diagram of the coordination between the relay receiving coil and the transmitting coil;

[0028] Figure 6 Schematic diagram of the circuit topology of a wireless coupling system that uses relay coils to achieve cross-metal energy transfer.

[0029] In the accompanying drawings, 1-transmitting coil, 2-metal base, 3-metal connecting seat, 4-relay receiving coil, 5-relay transmitting coil, 6-conducting wire, 7-non-metallic shell, 8-receiving coil, 9-flexible ferrite one, 10-flexible ferrite two, 11-flexible ferrite three, 12-flexible ferrite four, 13-wire slot circle one, 14-support plate, 15-lower support seat, 16-center column, 17-upper support slot, 18-support plate, 19-structural circle, 20-wire slot circle two. DETAILED DESCRIPTION

[0030] This embodiment provides a wireless coupling device for realizing cross-metal energy transmission using a relay coil, such as Figure 1-Figure 5 As shown, from bottom to top, it includes a transmitting part, a relay part and a receiving part, and the transmitting coil 1 of the transmitting part is sleeved on the inner side of the metal base 2;

[0031] The relay part includes a metal connection seat 3, a relay receiving coil 4 and a relay transmitting coil 5. The relay receiving coil 4 is arranged at the bottom of the metal connection seat 3, and the relay transmitting coil 5 is arranged at the top of the metal connection seat 3. The relay receiving coil 4 and the relay transmitting coil 5 are connected through a wire 6. The bottom of the metal connection seat 3 is inserted into the inner side of the metal base 2, so that the relay receiving coil 4 is coupled with the transmitting coil 1.

[0032] The receiving part includes a non-metallic shell 7 and a receiving coil 8 inside thereof. The relay transmitting coil 5 is coupled with the receiving coil 8 to transfer the electric energy and data of the transmitting coil 1 to the receiving coil 8 .

[0033] Optionally, the transmitting part includes a transmitting coil 1, a metal base 2 and a flexible ferrite 9, the transmitting coil 1, the metal base 2 and the flexible ferrite 9 are uniformly circular and concentrically arranged, the flexible ferrite 9 is arranged on the inner wall of the metal base 2, the transmitting coil 1 is uniformly wound on the inner side surface of the flexible ferrite 9, and the flexible ferrite 9 constrains the magnetic field generated by the transmitting coil 1, thereby enhancing the coupling ability between the transmitting coil 1 and the relay receiving coil 4.

[0034] Further optionally, the metal base 2 includes a vertical wire groove ring 13 and a horizontal support plate 14, the wire groove ring 13 is circular, the support plate 14 is annular, the bottom of the wire groove ring 13 is fixedly connected to the inner circle of the support plate 14, and a number of through holes are evenly arranged on the support plate 14, so that the metal base 2 can be fixed on the charging platform by screws or bolts.

[0035] Further optionally, the height of the flexible ferrite 9 is equal to the height of the transmitting coil 1, so that the flexible ferrite 9 can fully cover the transmitting coil 1, thereby improving the magnetic field confinement capability.

[0036] The wire slot circle 13 acts as a wire slot of the transmitting coil 1. The height of the wire slot circle 13 is h. The distance between the inner wall of the wire slot circle 13 and the outer side surface of the wire slot circle 20 is 2w. When the wire diameter of the transmitting coil 1 is b, the number of turns of the single-layer transmitting coil 1 is h / b turns, and the number of layers of the transmitting coil 1 is w / b. The transmitting coil 1 can be fed with 85kHz alternating current, so that the transmitting coil 1 generates an alternating magnetic field, thereby coupling with the relay receiving coil 4.

[0037] Optionally, the metal connection seat 3 is cylindrical as a whole, and includes a lower support seat 15, a center column 16 and an upper support groove 17 which are concentrically arranged from bottom to top. The outer diameters of the center column 16, the upper support groove 17 and the lower support seat 15 gradually increase. A wire groove ring 20 is provided at the bottom of the lower support seat 15 for arranging the relay receiving coil 4. The center column 16 is hollow and can accommodate the wire passing through the center column 16, while reducing the weight of the metal connection seat 3.

[0038] The bottom of the upper supporting groove 17 is communicated with the inner space of the central column 16 , and the relay transmitting coil 5 is arranged on the inner wall of the upper supporting groove 17 .

[0039] Further optionally, the lower support seat 15 includes a horizontal support plate 18 and a vertical structural ring 19, the support plate 18 is circular and is arranged at the lower part of the lower support seat 15, and a circular structural ring 19 is provided on the outer edge of the support plate 18. The support plate 18 divides the internal space of the structural ring 19 into two parts, an upper part and an lower part, and a plurality of upper reinforcing ribs are provided on the inner wall of the upper structural ring 19, and are evenly arranged along the circumference of the structural ring 19; a plurality of lower reinforcing ribs are provided on the inner wall of the lower structural ring 19, and are evenly arranged along the circumference of the structural ring 19.

[0040] Generally, the area of ​​the ground or charging platform where the transmitting coil 1 is located is larger than the electrical equipment that needs to be charged, providing a larger range for the electrical equipment to dock, and charging can be performed within this range. Therefore, the diameter of the transmitting coil 1 is larger than the diameter of the receiving coil 8. The structural characteristics of the metal connection seat 3, which is small at the top and large at the bottom, adapt to the above-mentioned form characteristics of the transmitting coil 1 and the receiving coil 8. The above-mentioned structure of the lower support seat 15 can not only improve the stability of the metal connection seat 3, avoid the metal connection seat 3 from falling over and cutting off the connection between the transmitting coil 1 and the receiving coil 8, thereby interrupting charging and data transmission, but also can reduce the weight of the metal connection seat 3 while improving the strength of the lower support seat 15.

[0041] Further optionally, a second wire groove ring is provided on the outer side of the bottom of the structural ring 19 below the support plate 18, and the second wire groove ring is recessed into the inner part of the downward support seat 15, and a circle of flexible ferrite 2 10 is wound around the outer side of the second wire groove ring, and the outer side of the flexible ferrite 2 10 is evenly wound with a relay receiving coil 4; the height of the flexible ferrite 2 10 is equal to the height of the relay receiving coil 4, so that the flexible ferrite 2 10 can fully cover the relay receiving coil 4, thereby improving the magnetic field confinement capability;

[0042] During charging, the second wire groove ring is placed inside the first wire groove ring 13, so that the transmitting coil 1 and the relay receiving coil 4 are directly opposite to each other, and there is a small gap between the transmitting coil 1 and the relay receiving coil 4, so as to couple and transfer electric energy and communication data.

[0043] The height of the second wire groove circle is equal to the height of the first wire groove circle 13, both are h; the wire diameter of the relay receiving coil 4 is c, and the number of turns of the single-layer relay receiving coil 4 is h / c turns. The horizontal depth of the second wire groove circle is w, the distance between the inner wall of the first wire groove circle 13 and the outer side of the second wire groove circle is 2w, and the number of layers of the relay receiving coil 4 is w / c.

[0044] Further optionally, a through hole is provided on the side wall of the wire groove ring 2, so that the wire 6 can pass through the space below the support plate 18; a through hole is also provided on the support plate 18, so that the wire 6 can pass through the interior of the center column 16, and the wire extends upward along the inner wall of the center column 16 until the wire 6 is connected to the relay transmitting coil 5.

[0045] Optionally, the bottom of the central column 16 is detachably connected to the upper surface of the support plate 18 by screws, so as to facilitate replacement of a more suitable central column 16 according to the distance requirement between the transmitting coil 1 and the receiving coil 8 .

[0046] Optionally, a through hole is provided on the bottom surface of the upper support groove 17 for connecting to the central column 16; the diameter of the through hole of the upper support groove 17 is smaller than the inner diameter of the upper support groove 17, so that a circle of platform is provided between the vertical side wall of the upper support groove 17 and the through hole for placing the relay transmitting coil 5;

[0047] A circle of flexible ferrite three 11 is provided on the inner side of the vertical side wall of the upper support groove 17, and the relay transmitting coil 5 is evenly wound on the inner side of the flexible ferrite three 11; the height of the flexible ferrite three 11 is not less than the height of the relay transmitting coil 5, so that the flexible ferrite three 11 can fully cover the relay transmitting coil 5, thereby improving the magnetic field confinement capability.

[0048] The height of the upper support groove 17 is h1, and when the wire diameter of the relay transmitting coil 5 is d, the number of turns of the single-layer relay transmitting coil 5 is h1 / d.

[0049] Optionally, the two ends of the relay transmitting coil 5 are on the same vertical line, and the two ends of the relay receiving coil 4 are on the same vertical line; the starting end of the relay transmitting coil 5 is connected to the starting end of the relay receiving coil 4 through wire 1, and the end of the relay transmitting coil 5 is connected to the end of the relay receiving coil 4 through wire 2; the center column 16 accommodates wire 1 and wire 2 to pass through.

[0050] Optionally, the non-metallic shell 7 of the receiving part is cylindrical, the bottom surface of the non-metallic shell 7 is open, and a through hole is formed on the top surface, and the wires connected to the receiving coil 8 pass through the through hole;

[0051] A flexible ferrite four 12 is provided on the inner wall of the vertical side of the non-metallic shell 7, and a receiving coil 8 is evenly wound on the inner side of the flexible ferrite four 12. The height of the flexible ferrite four 12 is not less than the height of the receiving coil 8, so that the flexible ferrite four 12 can fully cover the receiving coil 8, thereby improving the magnetic field confinement capability and the coupling capability between the receiving coil 8 and the relay transmitting coil 5; the receiving coil 8 is suspended by the wires connected to it, and the top of the receiving coil 8 is tightly attached to the lower surface of the top surface of the non-metallic shell 7, so that the receiving coil 8 and the relay transmitting coil 5 can achieve close coupling.

[0052] When the height of the non-metallic shell 7 is h2 and the wire diameter of the receiving coil 8 is e, the number of turns of the single-layer receiving coil 8 is h2 / e.

[0053] In a second aspect, the present embodiment provides a wireless coupling system for realizing cross-metal energy transmission using a relay coil, including a DC power supply, an inverter circuit, a resonant compensation network and a rectifier circuit, wherein the inverter circuit is a full-bridge inverter, and the resonant compensation network adopts bilateral series compensation, including a compensation circuit 1 and a compensation circuit 2, wherein the compensation circuit 1 is connected to the inverter circuit, and the compensation circuit 2 is connected to the rectifier circuit, and the rectifier circuit adopts a full-bridge rectifier;

[0054] The transmitting coil of the wireless coupling device for realizing cross-metal energy transmission by using a relay coil is connected to the compensation circuit 1, and the receiving coil is connected to the compensation circuit 2; the relay unit is provided between the compensation circuit 1 and the compensation circuit 2;

[0055] The first compensation circuit is connected to the data injection circuit, and the second compensation circuit is connected to the data extraction circuit.

[0056] like Figure 6 As shown, in the inverter circuit and the compensation circuit 1 of the present invention, a DC power supply is used to generate an AC voltage source through a phase-shift controlled inverter for driving, I1 is the current flowing into the transmitting coil, L1 is the inductance value of the transmitting coil, C1 is the matching capacitor of the transmitting coil, and the transmitting coil and its matching capacitor resonate at the energy transmission frequency, so that the phase angle of the input voltage and the input current are basically consistent, thereby improving the quality factor of the circuit and reducing the reactive power loss of the circuit.

[0057] In the relay part, L2 and L3 are the inductance values ​​of the receiving coil at the relay end and the transmitting coil at the relay end respectively. The total compensation capacitance of the relay receiving coil and the relay transmitting coil is C 21 and C 22 The two capacitors are connected in series to reduce the voltage stress caused by the resonant coil, M 12 represents the mutual inductance between the transmitting coil and the relay receiving coil, L4 is the inductance of the receiving coil, M 34 Represents the mutual inductance between the relay transmitting coil and the receiving coil, where I 23 It is the current flowing between the relay transmitting coil and the receiving coil.

[0058] In the compensation circuit 2 and the rectifier circuit, the AC power is converted into DC power and fed to the load R L Power is supplied, C3 is the matching capacitor of the receiving coil, which resonates with the receiving coil to reduce the reactive power loss of the receiving end during energy transmission.

[0059] In the data injection circuit, u s Represents the signal source after the data signal passes through the modulation circuit, L P1is the primary resonant inductance of the signal, C P1 is the signal primary side resonant capacitor, the two are in a series resonant state, the resonant frequency is the working frequency of the energy channel, and the energy channel is in a short circuit state here. P1 and C P1 Connected in series to compensation circuit 1. L P2 is the signal secondary side resonant inductor, C P2 is the signal sub-resonance capacitor, and the two are in a series resonance state. P2 and C P2 Connected in series to the compensation circuit 2. The signal is transmitted through L P and C P The LC series filter circuit is composed of a resonant LC series filter circuit at the energy working frequency, which reduces the voltage stress of the energy channel in the data circuit, and injects and extracts signals into the system topology. The two ends of the LC series filter circuit are respectively connected by adding an isolation transformer T with a turn ratio of n:1 (the first transformer T1 and the second transformer T2, respectively), so as to attenuate the high harmonics of the energy and amplify the data signal. d1 C is the compensation capacitor of the first transformer T1 at the signal frequency, which performs impedance matching on the signal before injecting it into the first transformer T1 to reduce the attenuation in the transmission channel. d1 Connected in series with T1. d2 R is the compensation capacitor of the second transformer T2 at the signal frequency, which performs impedance matching on the signal before injecting it into the second transformer T2. dd As a sampling resistor, it collects and demodulates the signal transmitted from the transmitter to the receiver via the relay unit. d2 With T2, R dd For series connection.

Claims

1. A wireless coupling device for realizing cross-metal energy transmission using a relay coil, characterized in that: From bottom to top, it includes a transmitting part, a relay part and a receiving part, and the transmitting coil of the transmitting part is sleeved on the inner side of the metal base; The relay part includes a metal connection seat, a relay receiving coil and a relay transmitting coil. The relay receiving coil is arranged at the bottom of the metal connection seat, and the relay transmitting coil is arranged at the top of the metal connection seat. The relay receiving coil and the relay transmitting coil are connected by a wire. The bottom of the metal connection seat is inserted into the inner side of the metal base, so that the relay receiving coil and the transmitting coil are coupled. The receiving part includes a non-metallic shell and a receiving coil inside thereof. The relay transmitting coil is coupled with the receiving coil to transfer the electric energy and data of the transmitting coil to the receiving coil.

2. The wireless coupling device according to claim 1, characterized in that: The transmitting part includes a transmitting coil, a metal base and a flexible ferrite 1. The transmitting coil, the metal base and the flexible ferrite 1 are uniformly circular and concentrically arranged. The flexible ferrite 1 is arranged on the inner wall of the metal base. The transmitting coil is uniformly wound on the inner side surface of the flexible ferrite 1. The flexible ferrite 1 constrains the magnetic field generated by the transmitting coil to enhance the coupling ability between the transmitting coil and the relay receiving coil.

3. The wireless coupling device according to claim 2, characterized in that: The metal base includes a vertical wire groove ring 1 and a horizontal support plate, the wire groove ring 1 is circular, the support plate is annular, the bottom of the wire groove ring 1 is fixedly connected to the inner ring of the support plate, and a plurality of through holes are evenly arranged on the support plate, so that the metal base can be fixed on the charging platform by screws or bolts; The height of the flexible ferrite 1 is equal to the height of the transmitting coil, so that the flexible ferrite 1 can fully cover the transmitting coil and improve the magnetic field confinement capability.

4. The wireless coupling device according to claim 1, characterized in that: The metal connection seat is cylindrical as a whole, and includes a lower support seat, a center column and an upper support groove which are arranged concentrically from bottom to top. The outer diameters of the center column, the upper support groove and the lower support seat gradually increase. A second wire groove ring is provided at the bottom of the lower support seat for setting a relay receiving coil. The center column is hollow and can accommodate the wire passing through the center column, while reducing the weight of the metal connection seat. The bottom of the upper supporting groove is communicated with the inner space of the central column, and the relay transmitting coil is arranged on the inner wall of the upper supporting groove.

5. The wireless coupling device according to claim 4, characterized in that: The lower support seat includes a horizontal support plate and a vertical structural ring. The support plate is circular and is arranged at the lower part of the lower support seat. A circular structural ring is arranged on the outer edge of the support plate. The support plate divides the internal space of the structural ring into two parts, an upper part and an lower part. A plurality of upper reinforcing ribs are arranged on the inner wall of the upper structural ring, and are evenly arranged along the circumference of the structural ring; a plurality of lower reinforcing ribs are arranged on the inner wall of the lower structural ring, and are evenly arranged along the circumference of the structural ring.

6. The wireless coupling device according to claim 5, characterized in that: A second wire groove ring is provided on the outer side surface of the bottom of the structural ring under the support plate. The second wire groove ring is recessed into the inner part of the downward support seat. A circle of flexible ferrite 2 is wound around the outer side surface of the second wire groove ring. The outer side surface of the second flexible ferrite is evenly wound with a relay receiving coil. The height of the second flexible ferrite is equal to the height of the relay receiving coil, so that the second flexible ferrite can fully cover the relay receiving coil, thereby improving the magnetic field confinement capability. During charging, the second wire slot circle is placed inside the first wire slot circle, so that the transmitting coil and the relay receiving coil are directly opposite to each other for coupling and transmission of electrical energy and communication data.

7. The wireless coupling device according to claim 4, characterized in that: The bottom surface of the upper support groove is provided with a through hole for connecting to the central column; the diameter of the through hole of the upper support groove is smaller than the inner diameter of the upper support groove, so that there is a circle of platform between the vertical side wall of the upper support groove and the through hole for placing the relay transmission coil; A circle of flexible ferrite three is provided on the inner side of the vertical side wall of the upper support groove, and the relay transmitting coil is evenly wound on the inner side of the flexible ferrite three; the height of the flexible ferrite three is not less than the height of the relay transmitting coil, so that the flexible ferrite three can fully cover the relay transmitting coil and improve the magnetic field confinement capability.

8. The wireless coupling device according to claim 4, characterized in that: The two ends of the relay transmitting coil are on the same vertical line, and the two ends of the relay receiving coil are on the same vertical line; the starting end of the relay transmitting coil is connected to the starting end of the relay receiving coil through wire 1, and the end of the relay transmitting coil is connected to the end of the relay receiving coil through wire 2; the center column accommodates wire 1 and wire 2 to pass through.

9. The wireless coupling device according to claim 1, characterized in that: The non-metallic shell of the receiving part is cylindrical, and a flexible ferrite body 4 is arranged on the inner wall of the vertical side surface of the non-metallic shell, and a receiving coil is evenly wound on the inner side of the flexible ferrite body 4.

10. A wireless coupling system for realizing cross-metal energy transmission using a relay coil, characterized in that: It includes a DC power supply, an inverter circuit, a resonant compensation network and a rectifier circuit. The inverter circuit is a full-bridge inverter. The resonant compensation network adopts bilateral series compensation and includes a compensation circuit 1 and a compensation circuit 2. The compensation circuit 1 is connected to the inverter circuit, and the compensation circuit 2 is connected to the rectifier circuit. The rectifier circuit adopts a full-bridge rectifier. The transmitting coil of the wireless coupling device for realizing cross-metal energy transmission by using a relay coil as described in any one of claims 1 to 9 is connected to compensation circuit 1, and the receiving coil is connected to compensation circuit 2; the relay unit is provided between compensation circuit 1 and compensation circuit 2; The first compensation circuit is connected to the data injection circuit, and the second compensation circuit is connected to the data extraction circuit.

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