Power transmission structure in a rotary connection structure and smart glasses

Abstract

The application discloses a power transmission structure in a rotary connection structure and smart glasses. The application comprises a first connection assembly, a second connection assembly, a rotary connection assembly, a transmitting coupling assembly and a receiving coupling assembly; the first connection assembly is rotatably connected with the second connection assembly through the rotary connection assembly; the transmitting coupling assembly is arranged on the first connection assembly, and the receiving coupling assembly is arranged on the second connection assembly; when the first connection assembly and the second connection assembly rotate relatively, the transmitting coupling assembly always maintains an electromagnetic coupling relationship with the receiving coupling assembly; a transmitting coil of the transmitting coupling assembly and a receiving coil of the receiving coupling assembly are oppositely arranged on both sides of an axial direction of a rotation shaft of the rotary connection assembly; when the second connection assembly rotates within a preset rotation angle range, a variation of an effective coupling area between the transmitting coil and the receiving coil is lower than a preset threshold value; and the transmitting coupling assembly is used for wirelessly transmitting electric energy from the transmitting coil to the receiving coil.

Description

Technical Field

[0001] This application relates to the field of smart glasses technology, and more particularly to a power transmission structure in a rotating connection structure and smart glasses. Background Technology

[0002] In electronic devices with relatively rotating structures, it is usually necessary to transfer electrical energy between two relatively rotatable structural components to power electronic devices in different structural areas. In existing technologies, flexible circuit boards, wires, elastic contacts, or slip ring structures are commonly used to achieve electrical connections across the rotating areas.

[0003] However, during long-term repeated rotation, flexible circuit boards or wires are prone to fatigue damage due to repeated bending, which in turn affects the reliability of power supply; elastic contacts or slip ring structures are prone to decreased connection stability due to wear, poor contact, and other problems. In addition, traditional conductive connection structures usually require a large wiring space, which is not conducive to the miniaturization design of rotary connection structures.

[0004] As electronic devices become increasingly miniaturized and lightweight, higher demands are placed on the structural dimensions, connection stability, and lifespan of rotating connection areas. Existing rotating power supply structures still suffer from problems such as structural complexity, insufficient stability, or limited lifespan in practical applications, making it difficult to meet the application requirements of related products.

[0005] Therefore, how to provide a power transmission structure suitable for rotating connection structures to improve power supply stability and structural reliability under rotational conditions has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] To address the aforementioned technical problems, this application provides a power transmission structure in a rotating connection structure and smart glasses.

[0007] The technical solution provided in this application is described below:

[0008] This application provides a power transmission structure in a rotary connection structure, including: A first connecting component, a second connecting component, a rotary connecting component, a transmitting coupling component, and a receiving coupling component; The first connecting component is rotatably connected to the second connecting component via the rotary connecting component; The transmitting coupling component is disposed on the first connecting component, and the receiving coupling component is disposed on the second connecting component. When the first connecting component and the second connecting component rotate relative to each other, the transmitting coupling component always maintains an electromagnetic coupling relationship with the receiving coupling component. The transmitting coupling component includes a transmitting coil, and the receiving coupling component includes a receiving coil; The transmitting coil and the receiving coil are arranged opposite each other on the axial sides of the rotation axis of the rotating connecting assembly. When the second connecting assembly rotates within a preset rotation angle range, the change in the effective coupling area between the transmitting coil and the receiving coil is lower than a preset threshold. The transmitting coupling assembly is used to wirelessly transmit electrical energy to the receiving coil through the transmitting coil.

[0009] Optionally, the center of the transmitting coil or the center of the receiving coil is offset relative to the center of the rotation axis of the rotating connection assembly, and the offset distance is not greater than 0.5 mm.

[0010] Optionally, the preset threshold is 0.2.

[0011] Optionally, the transmitting coupling assembly further includes a transmitting resonant matching circuit electrically connected to the transmitting coil, and the receiving coupling assembly further includes a receiving resonant matching circuit electrically connected to the receiving coil. Both the transmitting resonant matching circuit and the receiving resonant matching circuit include a resonant capacitor. The transmitting resonant matching circuit is used to adjust the operating frequency according to the coupling state between the transmitting coil and the receiving coil.

[0012] Optionally, the transmitting resonant matching circuit includes a first resonant capacitor, and the receiving resonant matching circuit includes a second resonant capacitor, wherein the capacitance value of the first resonant capacitor is 100pF to 150pF, and the capacitance value of the second resonant capacitor is 80pF to 120pF.

[0013] Optionally, the transmit coupling component and the receive coupling component operate at a frequency of 85kHz to 205kHz, 6.78MHz, or 13.56MHz.

[0014] Optionally, the receiving coupling component includes a load modulation circuit, and the transmitting coupling component includes a carrier frequency modulation circuit. The load modulation circuit is electrically connected to the receiving coil, and the carrier frequency modulation circuit is electrically connected to the transmitting coil.

[0015] Optionally, the load modulation circuit includes a modulation switch and a modulation impedance branch connected to the modulation switch. The modulation impedance branch is connected in parallel on the output side of the receiving coil. The carrier frequency modulation circuit includes a frequency switching module and multiple resonant branches connected to the frequency switching module. The multiple resonant branches correspond to different carrier frequencies.

[0016] Optionally, both the transmitting coil and the receiving coil are 4-layer flexible circuit board coil structures, with each layer having 10 to 15 turns of conductive winding. The total number of turns of the transmitting coil and the receiving coil is 40 to 50 turns, and the inductance of the transmitting coil and the receiving coil is 0.8 μH to 1.5 μH.

[0017] A second aspect of this application provides a smart glasses system, including the power transmission structure in the rotating connection structure described in any one aspect of the first application.

[0018] As can be seen from the above technical solutions, this application has the following beneficial effects: 1. This application achieves wireless power transmission by setting a transmitting coupling component and a receiving coupling component between the first connecting component and the second connecting component, respectively, and by utilizing the electromagnetic coupling between the transmitting coil and the receiving coil. This avoids problems such as bending fatigue, contact wear, and connection failure caused by traditional wires, flexible circuit boards, or sliding contacts crossing the rotating area, and is beneficial to improving the power supply stability and service life of the rotating connection structure during long-term rotation.

[0019] 2. The transmitting coil and the receiving coil are positioned opposite each other on the axial sides of the rotating shaft of the rotating connecting assembly. When the second connecting assembly rotates within a preset rotation angle range, the change in the effective coupling area between the transmitting coil and the receiving coil is less than a preset threshold. This helps to reduce coupling fluctuations caused by changes in relative position during rotation and improves the stability of wireless power transmission.

[0020] 3. This application does not require the setting of a physical conductive connection structure in the rotating area, which helps to reduce the structural complexity and space occupation of the rotating connection area, and thus is suitable for product applications in miniaturized, lightweight and high-frequency rotation scenarios. Attached Figure Description

[0021] Figure 1 This is a partially cross-sectional schematic diagram of an embodiment of the power transmission structure in the rotary connection structure provided in this application; Figure 2 An exploded view of an embodiment of the power transmission structure in the rotary connection structure provided in this application; Figure 3 This is a schematic diagram of an embodiment of the effective coupling region in the power transmission structure of the rotary connection structure provided in this application; Figure 4 This is a schematic diagram of the electrical connection structure of an embodiment of the power transmission structure in the rotary connection structure provided in this application. Figure 5 This is a schematic diagram of an embodiment of the smart glasses provided in this application. Detailed Implementation

[0022] In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and other terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.

[0023] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0024] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0025] Furthermore, the structures, proportions, sizes, etc., drawn in the accompanying drawings of this application are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0026] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] See Figures 1 to 4 The first aspect of this application provides an embodiment of a power transmission structure in a rotary connection structure, the embodiment comprising: First connecting component 01, second connecting component 02, rotary connecting component 03, transmitting coupling component 04, and receiving coupling component 05; The first connecting component 01 is rotatably connected to the second connecting component 02 via the rotary connecting component 03; The transmitting coupling component 04 is disposed on the first connecting component 01, and the receiving coupling component 05 is disposed on the second connecting component 02. When the first connecting component 01 and the second connecting component 02 rotate relative to each other, the transmitting coupling component 04 always maintains an electromagnetic coupling relationship with the receiving coupling component 05. The transmitting coupling component 04 includes a transmitting coil 06, and the receiving coupling component 05 includes a receiving coil 07; The transmitting coil 06 and the receiving coil 07 are arranged opposite each other on the axial sides of the rotating shaft of the rotating connecting assembly 03. When the second connecting assembly 02 rotates within a preset rotation angle range, the change in the effective coupling area between the transmitting coil 06 and the receiving coil 07 is lower than a preset threshold. The transmitting coupling component 04 is used to wirelessly transmit electrical energy to the receiving coil 07 via the transmitting coil 06.

[0028] In this embodiment, the first connecting component 01 and the second connecting component 02 can be two relatively rotatable structural components in the device, such as two housing structures, two rotating end components, or two folding connecting components. The rotary connecting component 03 is used to realize the rotary connection between the first connecting component 01 and the second connecting component 02. The rotary connecting component 03 may include a rotating shaft, a rotating shaft sleeve, a damping element, a limiting element, or other structures for forming a rotating pair. The rotary connecting component 03 forms a rotating axis so that the second connecting component 02 can rotate relative to the first connecting component 01 about the rotating axis.

[0029] In this embodiment, the transmitting coupling component 04 is disposed inside the first connecting component 01 or near the rotating connecting component 03, and the receiving coupling component 05 is disposed inside the second connecting component 02 or near the rotating connecting component 03. By positioning the transmitting coupling component 04 and the receiving coupling component 05 on opposite sides of the rotating region, they maintain a corresponding electromagnetic coupling relationship during structural rotation.

[0030] Specifically, the transmitting coupling assembly 04 includes a transmitting coil 06, and the receiving coupling assembly 05 includes a receiving coil 07. Both the transmitting coil 06 and the receiving coil 07 can be planar helical coil structures, and are respectively fixed in the mounting area inside the corresponding connecting assembly. The transmitting coil 06 and the receiving coil 07 are arranged opposite each other on opposite sides of the rotating shaft, so that the alternating magnetic field generated by the transmitting coil 06 can pass through the area where the receiving coil 07 is located, thereby inducing electrical energy in the receiving coil 07.

[0031] In some embodiments, the axial distance between the transmitting coil 06 and the receiving coil 07 can be 0.5 mm to 2 mm. By controlling the distance between them, it is beneficial to maintain a high magnetic field coupling strength within a limited structural space.

[0032] In this embodiment, the second connecting component 02 can rotate relative to the first connecting component 01 within a preset rotation angle range. For example, the preset rotation angle range can be 0° to 180°. During rotation, the effective coupling area between the receiving coil 07 and the transmitting coil 06 changes accordingly due to the change in their positions. To improve the stability of wireless power transmission, in this embodiment, the relative positional relationship between the transmitting coil 06 and the receiving coil 07 is configured such that when the second connecting component 02 rotates within the preset rotation angle range, the change in the effective coupling area is less than a preset threshold.

[0033] The effective coupling region can be understood as the overlapping region between the effective magnetic field coverage area formed by the transmitting coil 06 and the effective induction area of ​​the receiving coil 07. The change can be characterized by the proportion of the overlapping area change at different rotation angles. For example, in some embodiments, the following relationship can be used to describe it: Here, represents the change in the effective coupling region, represents the maximum effective coupling region area within the preset rotation range, and represents the minimum effective coupling region area within the preset rotation range. By keeping the change in the effective coupling region below a preset threshold, the impact of coupling state fluctuations during rotation on power transmission stability is reduced.

[0034] In an optional embodiment, the change in the effective coupling region is less than 0.2.

[0035] When the change in the effective coupling area is less than 0.2, it indicates that the effective magnetic field coverage area between the transmitting coil 06 and the receiving coil 07 maintains a high degree of consistency throughout the entire preset rotation range, which is beneficial for maintaining stable wireless power transmission performance.

[0036] In some embodiments, the transmitting coil 06 and the receiving coil 07 can be arranged in a non-perfectly coaxial relative configuration to reduce the rate of change of the overlapping area during rotation. For example, at least one of the transmitting coil 06 and the receiving coil 07 can be offset relative to the rotation axis, or a coil profile structure extending along the rotation trajectory can be used to improve the continuity of magnetic field coverage at different rotation angles.

[0037] In this embodiment, the transmitting coupling component 04 is used to input alternating current into the transmitting coil 06 to form an alternating magnetic field; the receiving coil 07 is used to receive the induced energy generated by the alternating magnetic field and output electrical energy to the downstream load. The transmitting coupling component 04 may include a power drive circuit, a resonant matching circuit, and a power supply circuit, while the receiving coupling component 05 may include a rectifier circuit, an energy storage circuit, and a voltage regulator output circuit.

[0038] In some implementations, the transmitting coil 06 and the receiving coil 07 can operate at a preset resonant frequency. For example, they can operate in the 13.56MHz band. By making the transmitting and receiving sides form corresponding resonant states, it is beneficial to improve the wireless power transmission efficiency and reduce coupling losses caused by structural rotation.

[0039] Furthermore, since this embodiment does not require the use of wires, flexible circuit boards, or sliding conductive structures to cross the rotation area, it can reduce mechanical fatigue and contact wear problems caused by long-term repeated rotation.

[0040] The power transmission structure in the rotary connection structure of this embodiment is suitable for various electronic devices or mechatronic devices with relative rotational connections that require energy transmission across rotational interfaces. It is particularly suitable for applications with limited structural space, frequent long-term rotation, and high requirements for connection reliability and service life.

[0041] In practical applications, this structure can replace traditional wires, flexible circuit boards, or sliding contact power supply methods to achieve wireless power transmission between the two sides of the rotating interface, thereby reducing the risk of failure caused by mechanical bending or contact wear. Because this structure can maintain a relatively stable electromagnetic coupling relationship during rotation, it is suitable for scenarios requiring continuous power supply over a large rotation angle range.

[0042] In a specific, but not limiting, application example, this structure can be used in smart glasses products. In smart glasses, the frame and temples are typically connected by a hinge structure to achieve a foldable or rotatable connection. The frame side usually houses the main control circuitry, battery, or processing unit, while the temple side typically integrates load units such as speakers, microphones, sensors, or wireless communication modules. In this scenario, the transmitting coupling component 04 can be placed on the frame side, and the receiving coupling component 05 can be placed on the temple side, allowing electrical energy to be transmitted via electromagnetic coupling through the rotating hinge area, thereby replacing the traditional FPC cross-hinge connection method.

[0043] During the folding or opening / closing of smart glasses, the temples rotate relative to the frame. The structure of this embodiment can maintain a relatively stable coupling relationship during this rotation, ensuring a continuous and stable power supply to the load unit on the temple side. For example, when driving a speaker for audio playback, a microphone for voice acquisition, or an inertial sensor for attitude detection on the temple side, continuous power supply can be achieved through this wireless power transmission structure.

[0044] In addition to smart glasses, this structure can also be extended to other electronic devices with rotating or hinged structures, such as the hinge power supply structure of foldable display devices, the rotation power supply structure of rotatable camera modules, and the connection power supply structure of flip-up wearable devices. It can be applied to any scenario where there is a relative rotational connection and a stable cross-border power supply is required.

[0045] In an optional embodiment, the center of the transmitting coil 06 or the center of the receiving coil 07 is offset relative to the center of the rotation axis of the rotating connection assembly 03 by a distance not greater than 0.5 mm.

[0046] In an optional embodiment, the transmitting coil 06 and the receiving coil 07 are respectively disposed on both sides of the rotating connecting assembly 03, wherein the centers of the transmitting coil 06 and / or the receiving coil 07 are slightly offset relative to the center of the rotation axis. For example, the transmitting coil 06 is fixedly disposed on the first mounting plane of the first connecting assembly 01, and the receiving coil 07 is fixedly disposed on the second mounting plane of the second connecting assembly 02, and the first mounting plane and the second mounting plane have a slight positional offset after being projected onto a plane perpendicular to the rotation axis.

[0047] Specifically, the offset can manifest as a radial offset of the center of the transmitting coil 06 relative to the center of the rotation axis, or a radial offset of the center of the receiving coil 07 relative to the center of the rotation axis. This results in the transmitting coil 06 and the receiving coil 07 not being perfectly coaxially aligned during static alignment, but rather forming a slightly misaligned arrangement. The offset distance is no greater than 0.5mm, in order to ensure the feasibility of structural assembly while avoiding a significant decrease in coupling efficiency due to excessive offset.

[0048] In one specific implementation example, when the rotary connection assembly 03 is in the closed state, the offset between the center of the transmitting coil 06 and the center of the receiving coil 07 in the direction perpendicular to the rotation axis is approximately 0.2 mm to 0.5 mm. Within this offset range, the overlapping area of ​​the magnetic fields of the transmitting coil 06 and the receiving coil 07 can still cover the main effective coupling area, thereby maintaining a relatively stable energy transmission capability at different rotation angles.

[0049] In an optional embodiment, the transmit coupling component 04 further includes a transmit resonant matching circuit 08 electrically connected to the transmit coil 06, and the receive coupling component 05 further includes a receive resonant matching circuit 09 electrically connected to the receive coil 07. Both the transmit resonant matching circuit 08 and the receive resonant matching circuit 09 include resonant capacitors. The transmit resonant matching circuit 08 is used to adjust the operating frequency according to the coupling state between the transmit coil 06 and the receive coil 07.

[0050] In one embodiment, the transmitting resonant matching circuit 08 and the receiving resonant matching circuit 09 form resonant circuits with the transmitting coil 06 and the receiving coil 07, respectively, to enable the transmitting coil 06 and the receiving coil 07 to achieve electromagnetic resonance within a preset operating frequency range. The resonant capacitor can be a fixed capacitor or a switchable capacitor array to adjust the equivalent resonant parameters.

[0051] In one specific implementation, the coupling state can be characterized by the change in the equivalent impedance of the transmitting coil 06, for example, by detecting the change in the phase difference between the transmitting current and voltage, which indirectly reflects the coupling strength between the transmitting coil 06 and the receiving coil 07. When the phase difference is detected to exceed a preset range, the resonant capacitor is switched to a different branch to change the transmitting resonant frequency, making it approach the optimal resonant point under the current coupling conditions.

[0052] In another embodiment, the receiving resonant matching circuit 09 can maintain a fixed resonant frequency or make fine adjustments within a limited range to form a coordinated matching relationship with the frequency adjustment on the transmitting side, thereby maintaining the overall system's energy transmission efficiency under different rotation angles or different spacing conditions.

[0053] In a further embodiment, the transmitting resonant matching circuit 08 includes a first resonant capacitor 10, and the receiving resonant matching circuit 09 includes a second resonant capacitor 11. The capacitance value of the first resonant capacitor 10 is 100pF to 150pF, and the capacitance value of the second resonant capacitor 11 is 80pF to 120pF.

[0054] In this embodiment, the first resonant capacitor 10 in the transmitting resonant matching circuit 08 and the transmitting coil 06 together form the resonant circuit on the transmitting side, and the second resonant capacitor 11 in the receiving resonant matching circuit 09 and the receiving coil 07 form the resonant circuit on the receiving side. Through the cooperation of the first resonant capacitor 10 and the second resonant capacitor 11, the transmitting side and the receiving side can form independent resonant responses at a preset operating frequency, which can improve the stability of energy transmission efficiency.

[0055] Specifically, the capacitance value of the first resonant capacitor 10 is set to 100pF to 150pF to match the equivalent inductance parameter of the transmitting coil 06, so that the resonant frequency of the transmitting side is stabilized near the target operating frequency band; the capacitance value of the second resonant capacitor 11 is set to 80pF to 120pF to match the equivalent inductance parameter of the receiving coil 07, so that the receiving side resonant circuit can maintain good energy receiving capability under different coupling conditions.

[0056] In one embodiment, the first resonant capacitor 10 and the second resonant capacitor 11 can each be a high-stability dielectric capacitor, such as a COG / NP0 ceramic capacitor, to reduce the drift of capacitor parameters caused by temperature changes or long-term operation, thereby ensuring the stability of the resonant frequency.

[0057] In another embodiment, the parameter difference between the first resonant capacitor 10 and the second resonant capacitor 11 is used to compensate for the asymmetric characteristics of the transmitting side and the receiving side under structural installation conditions, differences in coil equivalent inductance, and changes in coupling environment, so that the system can still maintain a relatively stable resonant matching state under different spacing and different rotation angle conditions.

[0058] In an optional embodiment, the transmit coupling component 04 and the receive coupling component 05 operate at frequencies from 85 kHz to 205 kHz, 6.78 MHz, or 13.56 MHz.

[0059] In an optional embodiment, the operating frequencies of the transmit coupling component 04 and the receive coupling component 05 are configured in a multi-band selectable mode to adapt to application scenarios with different coil sizes and power transmission requirements. Specifically, the transmit coupling component 04 and the receive coupling component 05 can selectively operate in any of the following frequency bands: a low-frequency band of 85kHz to 205kHz, a mid-frequency band of 6.78MHz, or a high-frequency band of 13.56MHz. Within the 85kHz to 205kHz frequency range, the system operates in a mode with lower loss and stronger penetration capability; at 6.78MHz, the system operates in a mode that balances higher power density and smaller coil size; and at 13.56MHz, the system operates in a highly integrated mode within the standard ISM band.

[0060] In one embodiment, the transmitting coupling component 04 can select the corresponding operating frequency band according to preset system configuration parameters or load requirements, and drive the transmitting coil 06 to generate an alternating magnetic field at the selected frequency; the receiving coupling component 05 synchronously matches the corresponding operating frequency to achieve effective induction and reception of the magnetic field energy of the transmitting coil 06.

[0061] In another embodiment, different operating frequencies correspond to different resonant matching parameter configurations, so that the resonant capacitors in the transmitting resonant matching circuit 08 and the receiving resonant matching circuit 09 can be adapted to the equivalent inductance characteristics of different frequency bands, thereby maintaining a better resonant matching state in different frequency bands, so as to improve the system's compatibility and power transmission efficiency in multiple application scenarios.

[0062] In an optional embodiment, the receiving coupling component 05 includes a load modulation circuit 12, and the transmitting coupling component 04 includes a carrier frequency modulation circuit 13. The load modulation circuit 12 is electrically connected to the receiving coil 07, and the carrier frequency modulation circuit 13 is electrically connected to the transmitting coil 06.

[0063] In this embodiment, the load modulation circuit 12 in the receiving coupling component 05 is electrically connected to the output terminal of the receiving coil 07, and is used to change the equivalent load characteristics presented by the receiving coil 07; the carrier frequency modulation circuit 13 in the transmitting coupling component 04 is electrically connected to the driving terminal of the transmitting coil 06, and is used to adjust the resonant excitation frequency or driving frequency of the transmitting coil 06.

[0064] In an optional embodiment, the load modulation circuit 12 includes a modulation switch 14 and a modulation impedance branch 15 connected to the modulation switch 14. The modulation impedance branch 15 is connected in parallel on the output side of the receiving coil 07. The carrier frequency modulation circuit 13 includes a frequency switching module 16 and multiple resonant branches 17 connected to the frequency switching module 16. The multiple resonant branches 17 correspond to different carrier frequencies.

[0065] In this embodiment, the load modulation circuit 12 is located after the output terminal of the receiving coil 07 and is used to periodically modulate the equivalent load at the output terminal of the receiving coil 07. Specifically, the modulation switch 14 can be configured as a MOSFET or an equivalent controllable switch device, and the modulation impedance branch 15 includes at least one resistor unit or RC network with a preset resistance value. The modulation switch 14 controls the on and off states between the modulation impedance branch 15 and the output side of the receiving coil 07, thereby realizing the dynamic change of the equivalent load on the receiving side.

[0066] The modulation impedance branch 15 can be connected in parallel between the DC output node after rectification of the receiving coil 07 and the reference ground. By changing the access state of the parallel branch, the equivalent reflected impedance of the receiving coil 07 changes, and a corresponding current or voltage disturbance signal is generated on the transmitting side to realize reverse information transmission based on the electromagnetic coupling path.

[0067] In an optional embodiment, the carrier frequency modulation circuit 13 is disposed between the drive stage of the transmitting coil 06 and the resonant matching network, for changing the excitation frequency of the transmitting coil 06. Specifically, the frequency switching module 16 includes a control logic unit and a frequency selection unit. The frequency selection unit is connected to multiple resonant branches 17, and different resonant branches 17 correspond to different resonant capacitances or equivalent resonant parameters, thereby forming multiple different carrier frequency operating points.

[0068] In one embodiment, multiple resonant branches 17 can each correspond to a preset set of discrete frequencies. By switching different resonant branches 17, the operating frequency of the transmitting coil 06 can be switched between multiple preset carrier frequencies.

[0069] In another embodiment, through the synergistic effect of the modulation impedance branch 15 and multiple resonant branches 17, the receiving side affects the input characteristics of the transmitting side by changing the load state, while the transmitting side responds to the feedback changes of the receiving side by changing the switching state of the resonant branches 17.

[0070] In an optional embodiment, both the transmitting coil 06 and the receiving coil 07 are 4-layer flexible circuit board coil structures, with each layer having 10 to 15 turns of conductive winding. The total number of turns for the transmitting coil 06 and the receiving coil 07 is 40 to 50 turns, and the inductance value of the transmitting coil 06 and the receiving coil 07 is 0.8 μH to 1.5 μH.

[0071] In this embodiment, both the transmitting coil 06 and the receiving coil 07 are formed using a multilayer flexible printed circuit board (FPC) stacked coil structure to improve the equivalent number of turns and magnetic field coupling capability of the coil within a limited space. Each layer of the flexible printed circuit board may be provided with a helical conductive winding, and the number of turns of the conductive winding in each layer is 10 to 15 turns. The layers are connected in series through vias or interlayer interconnection structures to form a multilayer cascaded coil structure.

[0072] In one embodiment, both the transmitting coil 06 and the receiving coil 07 are four-layer FPC coil structures, increasing the conductor length per unit area through a four-layer stacking method. Furthermore, the total number of turns for the transmitting coil 06 and the receiving coil 07 is set to 40 to 50 turns, where the total number of turns is the result of stacking the turns of each layer; for example, with 10 to 15 turns per layer, the target number of turns is formed through four layers. This turn configuration ensures that the coils have suitable equivalent inductance parameters at the target operating frequency.

[0073] In one embodiment, the equivalent inductance values ​​of the transmitting coil 06 and the receiving coil 07 are controlled within the range of 0.8μH to 1.5μH to match the resonant capacitance parameters of the preset resonant matching circuit, so that the transmitting side and the receiving side can form a stable resonant state at the target operating frequency.

[0074] See Figure 5 The second aspect of this application provides a smart glasses, including a power transmission structure 001 in the rotating connection structure of any one of the first aspects.

[0075] This application also provides a smart glasses, which includes a frame structure 002 and a temple structure 003. The frame structure 002 and the temple structure 003 are connected by a rotating connection component 03 and can rotate relative to each other to achieve folding or unfolding.

[0076] The power transmission structure 001 in the rotating connection structure is located between the frame structure 002 and the temple structure 003, and is used to achieve wireless power transmission during the relative rotation of the two. Specifically, the transmitting coupling component 04 is located inside the frame structure 002 or near the hinge, and the receiving coupling component 05 is located inside the temple structure 003 or near the hinge. This structure can maintain electromagnetic coupling even when the frame and temple rotate relative to each other.

[0077] In one specific embodiment, the transmitting coil 06 and the receiving coil 07 are respectively disposed on both sides of the hinge area of ​​the smart glasses, forming a main coupling area when the frame and temples are in a closed state, so that the temple side can continuously receive electrical energy supplied by the frame side. The electrical energy on the temple side can be used to drive functional units such as speakers, microphones, inertial sensors, or wireless communication modules.

[0078] In another embodiment, when the frame structure 002 and the temple structure 003 open and close within a preset angle range, the power transmission structure 001 can still maintain a stable wireless power supply capability to avoid breakage or poor contact caused by repeated bending of traditional wires or flexible lines in the hinge area, thereby improving the reliability and structural lifespan of smart glasses.

[0079] Furthermore, the smart glasses may further include a battery module, a control module, and a functional load module. The battery module is located on the frame side or temple side and is powered across the structure through the power transmission structure 001 in the rotating connection structure, making the overall structure more compact and reducing the space occupied by traditional cross-hinge wiring.

Claims

1. A power transmission structure in a rotary connection structure, characterized in that, include: A first connecting component, a second connecting component, a rotary connecting component, a transmitting coupling component, and a receiving coupling component; The first connecting component is rotatably connected to the second connecting component via the rotary connecting component; The transmitting coupling component is disposed on the first connecting component, and the receiving coupling component is disposed on the second connecting component. When the first connecting component and the second connecting component rotate relative to each other, the transmitting coupling component always maintains an electromagnetic coupling relationship with the receiving coupling component. The transmitting coupling component includes a transmitting coil, and the receiving coupling component includes a receiving coil; The transmitting coil and the receiving coil are arranged opposite each other on the axial sides of the rotation axis of the rotating connecting assembly. When the second connecting assembly rotates within a preset rotation angle range, the change in the effective coupling area between the transmitting coil and the receiving coil is lower than a preset threshold. The transmitting coupling assembly is used to wirelessly transmit electrical energy to the receiving coil through the transmitting coil.

2. The power transmission structure in the rotary connection structure according to claim 1, characterized in that, The center of the transmitting coil or the center of the receiving coil is offset relative to the center of the rotation axis of the rotating connection assembly, and the offset distance is no greater than 0.5 mm.

3. The power transmission structure in the rotary connection structure according to claim 2, characterized in that, The change in the effective coupling region is less than 0.

2.

4. The power transmission structure in the rotary connection structure according to claim 1, characterized in that, The transmitting coupling assembly further includes a transmitting resonant matching circuit electrically connected to the transmitting coil, and the receiving coupling assembly further includes a receiving resonant matching circuit electrically connected to the receiving coil. Both the transmitting resonant matching circuit and the receiving resonant matching circuit include a resonant capacitor. The transmitting resonant matching circuit is used to adjust the operating frequency according to the coupling state between the transmitting coil and the receiving coil.

5. The power transmission structure in the rotary connection structure according to claim 4, characterized in that, The transmitting resonant matching circuit includes a resonant capacitor with a capacitance value of 100pF to 150pF, and the receiving resonant matching circuit includes a resonant capacitor with a capacitance value of 80pF to 120pF.

6. The power transmission structure in the rotary connection structure according to claim 1, characterized in that, The transmit coupling component and the receive coupling component operate at frequencies of 85 kHz to 205 kHz, 6.78 MHz, or 13.56 MHz.

7. The power transmission structure in the rotary connection structure according to claim 1, characterized in that, The receiving coupling component includes a load modulation circuit, and the transmitting coupling component includes a carrier frequency modulation circuit. The load modulation circuit is electrically connected to the receiving coil, and the carrier frequency modulation circuit is electrically connected to the transmitting coil.

8. The power transmission structure in the rotary connection structure according to claim 7, characterized in that, The load modulation circuit includes a modulation switch and a modulation impedance branch connected to the modulation switch. The modulation impedance branch is connected in parallel on the output side of the receiving coil. The carrier frequency modulation circuit includes a frequency switching module and multiple resonant branches connected to the frequency switching module. The multiple resonant branches correspond to different carrier frequencies.

9. The power transmission structure in the rotary connection structure according to any one of claims 1 to 8, characterized in that, Both the transmitting coil and the receiving coil are 4-layer flexible circuit board coil structures, with each layer having 10 to 15 turns of conductive winding. The total number of turns of the transmitting coil is 40 to 50, and the total number of turns of the receiving coil is 40 to 50. The inductance of the transmitting coil and the receiving coil is 0.8μH to 1.5μH.

10. A type of smart glasses, characterized in that, The power transmission structure includes the rotary connection structure as described in any one of claims 1 to 9.

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