Wireless coupling device and system for cross-metal energy transmission using relay coil

Abstract

This invention relates to a wireless coupling device and system for cross-metal power transmission using a relay coil. The wireless coupling device includes, from bottom to top, a transmitting unit, a relay unit, and a receiving unit. The transmitting coil of the transmitting unit is fitted inside a metal base. The relay unit includes a metal connector, a relay receiving coil, and a relay transmitting coil. The relay receiving coil is located at the bottom of the metal connector, and the relay transmitting coil is located at the top of the metal connector. The relay receiving coil and the relay transmitting coil are connected by a wire. The bottom of the metal connector is inserted into the inside of the metal base, thereby coupling the relay receiving coil and the transmitting coil. The receiving unit includes a non-metallic outer shell and a receiving coil inside it. The relay transmitting coil is coupled to the receiving coil, transmitting electrical energy and data from the transmitting coil to the receiving coil.

Description

Technical Field

[0001] This invention belongs to the field of magnetic coupling wireless charging and near-field magnetic coupling communication technology, specifically relating to a wireless coupling device and system for cross-metal energy transfer using a relay coil. Background Technology

[0002] The technology of synchronous wireless power and data transmission has received increasing attention in the fields of unmanned systems and intelligent equipment applications. Wireless charging systems enable contactless power replenishment, allowing for power replenishment under unmanned conditions. Simultaneously, the battery, acting 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 technology of synchronous wireless power and data transmission is crucial. Currently, for conventional wireless charging devices, the power transmission distance is limited by the diameter of the coupling device coil. The ratio between these two is generally low, meaning that when the size of the wireless charging device is constrained (i.e., the coil diameter of the coupling device is limited), the charging distance of the system is also limited, hindering power transmission over longer distances. Furthermore, wireless charging devices are generally made of metal, which reflects electromagnetic waves, causing common wireless communication modules to malfunction and affecting the quality of conventional signal transmission. Summary of the Invention

[0003] To address the above problems, the present invention provides a wireless coupling device and system for cross-metal energy transmission using a relay coil. In a first aspect, the wireless coupling device includes, from bottom to top, a transmitter, a relay, and a receiver, with the transmitter coil of the transmitter being sleeved inside a metal base.

[0004] The relay unit includes a metal connector, a relay receiving coil, and a relay transmitting coil. The relay receiving coil is located at the bottom of the metal connector, and the relay transmitting coil is located at the top of the metal connector. The relay receiving coil and the relay transmitting coil are connected by a wire. The bottom of the metal connector is inserted into the inside of the metal base, so that the relay receiving coil and the transmitting coil are coupled.

[0005] The receiving unit includes a non-metallic casing and a receiving coil inside it. The relay transmitting coil is coupled to the receiving coil to transmit the electrical energy and data from the transmitting coil to the receiving coil.

[0006] Traditional wireless coupling charging devices directly couple the transmitting coil to the receiving coil, transferring electrical energy from the transmitting coil to the receiving coil. The transmitting coil is typically mounted on the ground or other charging platform, and its size is limited by the area of ​​the ground or charging platform. The receiving coil is usually mounted on the device being charged, and to achieve high energy transfer efficiency, the receiving coil (i.e., the device) cannot be too far from the transmitting coil. Since the casing of most devices is metal, metal reflects electromagnetic waves, which can affect the transmission quality of the wireless communication signal of the coupling charging device.

[0007] This invention incorporates a relay unit between the transmitting and receiving coils. The height of the relay unit can be adjusted according to the distance between the transmitting and receiving coils, thus removing the distance limitation between the device and the charging platform. The relay receiving coil at the bottom of the relay unit is coupled to the transmitting coil, receiving energy and data from the transmitting coil. The relay receiving coil is connected to the relay transmitting coil via a wire, and the relay transmitting coil is coupled to the receiving coil, transferring energy and data to the receiving coil. Data transmission is achieved through these two couplings and the wire, and is unaffected by metal.

[0008] Optionally, the transmitting unit includes a transmitting coil, a metal base, and a flexible ferrite core. The transmitting coil, the metal base, and the flexible ferrite core are all circular and concentrically arranged. The flexible ferrite core is disposed on the inner wall of the metal base. The transmitting coil is evenly wound around the inner side of the flexible ferrite core. The flexible ferrite core constrains the magnetic field generated by the transmitting coil, thereby enhancing the coupling capability between the transmitting coil and the relay receiving coil.

[0009] Optionally, the metal base includes a vertical wire groove ring and a horizontal support plate. The wire groove ring is circular, and the support plate is annular. The bottom of the wire groove ring is fixedly connected to the inner ring of the support plate. The support plate has several through holes evenly arranged on it, which can fix the metal base to the charging platform by screws or bolts.

[0010] Optionally, the height of the flexible ferrite is equal to the height of the transmitting coil, so that the flexible ferrite can fully cover the transmitting coil and improve the magnetic field confinement capability.

[0011] Optionally, the metal connector is cylindrical in shape and includes a lower support, a central column, and an upper support groove arranged concentrically from bottom to top. The outer diameters of the central column, the upper support groove, and the lower support gradually increase. The bottom of the lower support is provided with a wire groove ring II for setting the relay receiving coil. The central column is hollow, which can accommodate the wire passing through the central column and reduce the weight of the metal connector.

[0012] The bottom of the upper support groove is connected to the internal space of the central column, and the relay transmitting coil is located on the inner wall of the upper support groove.

[0013] Optionally, the lower support includes a horizontal support plate and a vertical structural ring. The support plate is circular and located at the bottom of the lower support. The outer edge of the support plate is provided with a circular structural ring. The support plate divides the internal space of the structural ring into upper and lower parts. The inner wall of the upper part of the structural ring is provided with several upper reinforcing ribs, which are evenly arranged along the circumference of the structural ring. The inner wall of the lower part of the structural ring is provided with several lower reinforcing ribs, which are evenly arranged along the circumference of the structural ring.

[0014] Optionally, a second groove ring is provided on the outer side of the bottom of the structural ring located below the support plate. The second groove ring is recessed into the lower support base. A second flexible ferrite is wound around the outer side of the second groove ring. A relay receiving coil is evenly wound around the outer side 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 and improve the magnetic field confinement capability.

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

[0016] Optionally, the bottom surface of the upper support groove is provided with a through hole for connecting 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 platform between the vertical sidewall of the upper support groove and the through hole for placing the relay transmitting coil.

[0017] A ring of flexible ferrite is provided on the inner side of the vertical sidewall of the upper support groove, and a relay transmitting coil is evenly wound on the inner side of the flexible ferrite. The height of the flexible ferrite is not less than the height of the relay transmitting coil, so that the flexible ferrite 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 beginning of the relay transmitting coil is connected to the beginning of the relay receiving coil through wire one, and the end of the relay transmitting coil is connected to the end of the relay receiving coil through wire two; the center column accommodates wire one and wire two through which they pass.

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

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

[0021] The aforementioned wireless coupling device for cross-metal energy transmission using a relay coil has its transmitting coil connected to compensation circuit one and its receiving coil connected to compensation circuit two; a relay unit is provided between compensation circuit one and compensation circuit two.

[0022] Compensation circuit one is connected to the data injection circuit, and compensation circuit two is connected to the data extraction circuit. Attached Figure Description

[0023] Figure 1 A schematic diagram of a wireless coupling device that uses a relay coil to achieve cross-metal energy transfer;

[0024] Figure 2 This is an exploded view of the launching section;

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

[0026] Figure 4 This is a schematic diagram of the receiving section;

[0027] Figure 5 This is a schematic diagram showing the connection between the relay receiving coil and the transmitting coil;

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

[0029] In the attached diagram, 1-transmitting coil, 2-metal base, 3-metal connector, 4-relay receiving coil, 5-relay transmitting coil, 6-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 groove ring one, 14-support plate, 15-lower support base, 16-center column, 17-upper support groove, 18-support plate, 19-structural ring, 20-wire groove ring two. Detailed Implementation

[0030] This embodiment provides a wireless coupling device for cross-metal energy transfer using a relay coil, such as... Figures 1-5 As shown, from bottom to top, it includes a transmitter, a relay, and a receiver. The transmitter coil 1 of the transmitter is sleeved inside the metal base 2.

[0031] The relay unit includes a metal connector 3, a relay receiving coil 4, and a relay transmitting coil 5. The relay receiving coil 4 is located at the bottom of the metal connector 3, and the relay transmitting coil 5 is located at the top of the metal connector 3. The relay receiving coil 4 and the relay transmitting coil 5 are connected by a wire 6. The bottom of the metal connector 3 is inserted into the inside of the metal base 2, so that the relay receiving coil 4 and the transmitting coil 1 are coupled.

[0032] The receiving unit includes a non-metallic housing 7 and a receiving coil 8 inside it. The relay transmitting coil 5 is coupled to the receiving coil 8 to transmit the electrical energy and data of the transmitting coil 1 to the receiving coil 8.

[0033] Optionally, the transmitting unit 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 all circular and concentrically arranged. The flexible ferrite 9 is disposed on the inner wall of the metal base 2. The transmitting coil 1 is evenly wound around the inner side of the flexible ferrite 9. The flexible ferrite 9 constrains the magnetic field generated by the transmitting coil 1, thereby enhancing the coupling capability between the transmitting coil 1 and the relay receiving coil 4.

[0034] Optionally, the metal base 2 includes a vertical groove ring 13 and a horizontal support plate 14. The groove ring 13 is circular, and the support plate 14 is annular. The bottom of the groove ring 13 is fixedly connected to the inner ring of the support plate 14. The support plate 14 has several through holes evenly arranged on it, which can fix the metal base 2 to the charging platform by screws or bolts.

[0035] 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 and improve the magnetic field confinement capability.

[0036] The slotted coil 13 serves as the slot for the transmitting coil 1. The height of the slotted coil 13 is h, and the distance between the inner wall of the slotted coil 13 and the outer surface of the slotted coil 20 is 2w. When the wire diameter of the transmitting coil 1 is b, the number of turns in a single layer of the transmitting coil 1 is h / b turns, and the number of layers in the transmitting coil 1 is w / b. An 85kHz alternating current can be passed through the transmitting coil 1, causing it to generate an alternating magnetic field, thereby coupling with the relay receiving coil 4.

[0037] Optionally, the metal connector 3 is cylindrical in shape and includes a lower support 15, a central column 16, and an upper support groove 17 arranged concentrically from bottom to top. The outer diameters of the central column 16, the upper support groove 17, and the lower support 15 gradually increase. The bottom of the lower support 15 is provided with a wire groove ring 20 for setting the relay receiving coil 4. The central column 16 is hollow, which can accommodate the wire passing through the central column 16, while reducing the weight of the metal connector 3.

[0038] The bottom of the upper support groove 17 is connected to the internal space of the central column 16, and the relay transmitting coil 5 is located on the inner wall of the upper support groove 17.

[0039] Optionally, the lower support 15 includes a horizontal support plate 18 and a vertical structural ring 19. The support plate 18 is circular and located at the lower part of the lower support 15. The outer edge of the support plate 18 is provided with a circular structural ring 19. The support plate 18 divides the internal space of the structural ring 19 into upper and lower parts. The inner wall of the upper part of the structural ring 19 is provided with several upper reinforcing ribs, which are evenly arranged along the circumference of the structural ring 19. The inner wall of the lower part of the structural ring 19 is provided with several lower reinforcing ribs, which 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 area of ​​the electrical equipment that needs to be charged, providing a larger area for the equipment to park and charge within this area. Therefore, the diameter of the transmitting coil 1 is larger than the diameter of the receiving coil 8. The top-smaller-bottom-larger structure of the metal connector 3 is adapted to the above-mentioned features of the transmitting coil 1 and the receiving coil 8. The above-mentioned structure of the lower support 15 can not only improve the stability of the metal connector 3, preventing the connection between the transmitting coil 1 and the receiving coil 8 from being severed and interrupting charging and data transmission if the metal connector 3 tilts over, but also improve the strength of the lower support 15 while reducing the weight of the metal connector 3.

[0041] Optionally, a second wire groove ring is provided on the outer side of the bottom of the structural ring 19 located below the support plate 18. The second wire groove ring is recessed into the lower support base 15. A second flexible ferrite 10 is wound around the outer side of the second wire groove ring. A relay receiving coil 4 is evenly wound around the outer side of the second flexible ferrite 10. The height of the second flexible ferrite 10 is equal to the height of the relay receiving coil 4, so that the second flexible ferrite 10 can fully cover the relay receiving coil 4 and improve the magnetic field confinement capability.

[0042] During charging, the second wire slot coil is placed inside the first wire slot coil 13, so that the transmitting coil 1 and the relay receiving coil 4 are directly opposite each other. There is a very small gap between the transmitting coil 1 and the relay receiving coil 4, which couples to transmit electrical energy and communication data.

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

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

[0045] Optionally, the bottom of the center column 16 is detachably connected to the upper surface of the support plate 18 by screws, which facilitates the replacement of a more suitable center column 16 according to the distance requirements between the transmitting coil 1 and the receiving coil 8.

[0046] Optionally, the bottom surface of the upper support groove 17 is provided with a through hole for connecting 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 there is a platform between the vertical sidewall of the upper support groove 17 and the through hole for placing the relay transmitting coil 5.

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

[0048] When the height of the upper support groove 17 is h1 and 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 beginning of the relay transmitting coil 5 is connected to the beginning of the relay receiving coil 4 through a first wire, and the end of the relay transmitting coil 5 is connected to the end of the relay receiving coil 4 through a second wire; the center column 16 accommodates the passage of the first and second wires.

[0050] Optionally, the non-metallic housing 7 of the receiving part is cylindrical, with an open bottom surface and a through hole on the top surface, through which the wire connected to the receiving coil 8 passes.

[0051] A flexible ferrite core 12 is provided on the inner wall of the vertical side of the non-metallic shell 7. A receiving coil 8 is uniformly wound around the inner side of the flexible ferrite core 12. The height of the flexible ferrite core 12 is not less than the height of the receiving coil 8, so that the flexible ferrite core 12 can fully cover the receiving coil 8, improve the magnetic field confinement capability, and improve the coupling capability between the receiving coil 8 and the relay transmitting coil 5. The receiving coil 8 is suspended by a wire connected to itself. The top of the receiving coil 8 is close to the lower surface of the top surface of the non-metallic shell 7, and the receiving coil 8 and the relay transmitting coil 5 can achieve close-range coupling.

[0052] When the height of the non-metallic casing 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] Secondly, this embodiment provides a wireless coupling system for cross-metal energy transmission using a relay coil, including a DC power supply, an inverter circuit, a resonant compensation network, and a rectifier circuit. The inverter circuit is a full-bridge inverter, and the resonant compensation network adopts bilateral series compensation, including a compensation circuit one and a compensation circuit two. The compensation circuit one is connected to the inverter circuit, and the compensation circuit two is connected to the rectifier circuit. The rectifier circuit adopts full-bridge rectification.

[0054] The aforementioned wireless coupling device for cross-metal energy transmission using a relay coil has its transmitting coil connected to compensation circuit one and its receiving coil connected to compensation circuit two; a relay unit is provided between compensation circuit one and compensation circuit two.

[0055] Compensation circuit one is connected to the data injection circuit, and compensation circuit two is connected to the data extraction circuit.

[0056] like Figure 6 As shown, in the inverter circuit and compensation circuit one of this invention, an AC voltage source is generated by a DC power supply 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, and C1 is the matching capacitor of the transmitting coil. 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, which improves the quality factor of the circuit and reduces the reactive power loss of the circuit.

[0057] In the repeater section, L2 and L3 are the inductance values ​​of the receiving coil and transmitting coil at the repeater end, respectively. The total compensation capacitance of the repeater receiving coil and the repeater 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. 12 This indicates the mutual inductance between the transmitting coil and the repeater receiving coil, where L4 is the inductance of the receiving coil, and M... 34 This represents the mutual inductance between the relay transmitting coil and the receiving coil, where I 23 This refers to the current flowing between the relay transmitting coil and the receiving coil.

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

[0059] In the data injection circuit, u s L represents the signal source that outputs the data signal after it has passed through the modulation circuit. P1For the primary resonant inductance of the signal, C P1 This is the primary-side resonant capacitor for the signal; both are in series resonance, and the resonant frequency is the operating frequency of the energy channel. The energy channel is short-circuited at this point. L P1 and C P1 It is connected in series in compensation circuit one. P2 For the secondary resonant inductance of the signal, C P2 The capacitor is the signal resonant capacitor, and the two are in series resonance. P2 and C P2 It is connected in series in compensation circuit two. The signal passes through L P and C P An LC series filter circuit resonates at the energy operating frequency to reduce voltage stress in the data circuit and inject and extract signals into the system topology. The LC series filter circuit is connected to two isolation transformers T (the first transformer T1 and the second transformer T2) with a turns ratio of n:1, respectively, to attenuate higher harmonics of the energy and amplify the data signal. d1 The capacitor C is a compensation capacitor for the first transformer T1 at the signal frequency. It performs impedance matching before the signal is injected into the first transformer T1 to reduce attenuation in the transmission path. d1 It is connected in series with T1. C d2 R is the compensation capacitor for the second transformer T2 at the signal frequency, used for impedance matching before the signal is injected 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. d2 With T2, R dd It is connected in series.

Claims

1. A wireless coupling device for cross-metal energy transfer using a relay coil, characterized in that, From bottom to top, it includes a transmitter, a relay, and a receiver, with the transmitter coil of the transmitter being sleeved inside the metal base; The relay unit includes a metal connector, a relay receiving coil, and a relay transmitting coil. The relay receiving coil is located at the bottom of the metal connector, and the relay transmitting coil is located at the top of the metal connector. The relay receiving coil and the relay transmitting coil are connected by a wire. The bottom of the metal connector is inserted into the inside of the metal base, so that the relay receiving coil and the transmitting coil are coupled. The receiving unit includes a non-metallic casing and a receiving coil inside it. The relay transmitting coil is coupled to the receiving coil to transmit the electrical energy and data from the transmitting coil to the receiving coil. The metal connector is cylindrical in shape and includes a lower support, a central column, and an upper support groove arranged concentrically from bottom to top. The outer diameters of the central column, the upper support groove, and the lower support gradually increase. The bottom of the lower support is provided with a wire groove ring II for setting the relay receiving coil. The central column is hollow, which can accommodate the wire passing through the central column and reduce the weight of the metal connector. The bottom of the upper support groove is connected to the internal space of the central column, and the relay transmitting coil is located on the inner wall of the upper support groove. The lower support base includes a horizontal support plate and a vertical structural ring. The support plate is circular and located at the bottom of the lower support base. The outer edge of the support plate is provided with a circular structural ring. The support plate divides the internal space of the structural ring into upper and lower parts. The inner wall of the upper part of the structural ring is provided with several upper reinforcing ribs, which are evenly arranged along the circumference of the structural ring. The inner wall of the lower part of the structural ring is provided with several lower reinforcing ribs, which are evenly arranged along the circumference of the structural ring. The outer side of the bottom of the structural ring located below the support plate is provided with a second groove ring, which is recessed into the lower support seat. The bottom surface of the upper support groove is provided with a through hole for connecting 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 platform between the vertical side wall of the upper support groove and the through hole for placing the relay transmitting coil.

2. The wireless coupling device according to claim 1, characterized in that, The transmitting unit includes a transmitting coil, a metal base, and a flexible ferrite core. The transmitting coil, the metal base, and the flexible ferrite core are all circular and concentrically arranged. The flexible ferrite core is disposed on the inner wall of the metal base. The transmitting coil is evenly wound around the inner side of the flexible ferrite core. The flexible ferrite core constrains the magnetic field generated by the transmitting coil, thereby enhancing the coupling capability 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 and a horizontal support plate. The wire groove ring is circular and the support plate is annular. The bottom of the wire groove ring is fixedly connected to the inner ring of the support plate. Several through holes are evenly arranged on the support plate, which can fix the metal base to the charging platform by screws or bolts. The height of the flexible ferrite is equal to the height of the transmitting coil, allowing the flexible ferrite to fully cover the transmitting coil and improve the magnetic field confinement capability.

4. The wireless coupling device according to claim 3, characterized in that, A flexible ferrite coil is wound around the outer side of the second wire groove coil, and a relay receiving coil is evenly wound around the outer side of the flexible ferrite coil. The height of the flexible ferrite coil is equal to the height of the relay receiving coil, so that the flexible ferrite coil can fully cover the relay receiving coil and improve the magnetic field confinement capability. During charging, the second coil is placed inside the first coil, so that the transmitting coil and the relay receiving coil are directly opposite each other and coupled to transmit electrical energy and communication data.

5. The wireless coupling device according to claim 1, characterized in that, The A ring of flexible ferrite is provided on the inner side of the vertical sidewall of the upper support groove, and a relay transmitting coil is evenly wound on the inner side of the flexible ferrite. The height of the flexible ferrite is not less than the height of the relay transmitting coil, so that the flexible ferrite can fully cover the relay transmitting coil and improve the magnetic field confinement capability.

6. The wireless coupling device according to claim 1, 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 beginning of the relay transmitting coil is connected to the beginning of the relay receiving coil through wire one, and the end of the relay transmitting coil is connected to the end of the relay receiving coil through wire two; the center column accommodates wire one and wire two through which they pass.

7. The wireless coupling device according to claim 1, characterized in that, The non-metallic outer shell of the receiving unit is cylindrical, and a flexible ferrite core is provided on the inner wall of the vertical side of the non-metallic outer shell. A receiving coil is uniformly wound on the inner side of the flexible ferrite core.

8. A wireless coupling system for cross-metal energy transfer 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 compensation circuit one and compensation circuit two. Compensation circuit one is connected to the inverter circuit, and compensation circuit two is connected to the rectifier circuit. The rectifier circuit adopts full-bridge rectification. The transmitting coil of the wireless coupling device for cross-metal energy transmission using a relay coil as described in any one of claims 1-7 is connected to a compensation circuit one, and the receiving coil is connected to a compensation circuit two; the relay unit is provided between the compensation circuit one and the compensation circuit two. Compensation circuit one is connected to the data injection circuit, and compensation circuit two is connected to the data extraction circuit.

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