An adaptive earpiece specification charging pod

Abstract

The present application relates to wireless earphone technical field, especially to a kind of self-adapting earphone specification charging bin, including bin, flexible adaptation component, magnetic field control component, contact matrix layer and controller, bin is equipped with self-adapting cavity;Flexible adaptation component includes flexible capsule and magnetic rheological material.The present application is by setting flexible capsule containing magnetic rheological material, magnetic field control component around capsule, contact matrix layer pasted on the surface of capsule and controller, realizes that charging bin is automatically shaped to any specification earphone contact Full-automatic shape and electrical identification are fitted, and after identification, magnetic rheological material is changed into high magnetic field solid state locking state by magnetic field control, so that the fitting form of contact matrix layer and earphone is solidified and locked, the stability of electrical connection is improved, manual adjustment and poor contact are avoided.The problem that compatibility is poor due to fixed or limited adjustment of earphone charging bin contact specification and charging reliability is affected due to unstable contact is solved.

Description

Technical Field

[0001] This invention relates to the field of wireless earphone technology, and more particularly to a charging case that adapts to earphone specifications. Background Technology

[0002] With the increasing popularity of true wireless earbuds, numerous brands and models have emerged in the market, but the location, shape, size, and spacing of their charging contacts (i.e., charging interface specifications) have not yet reached a unified standard. Currently, mainstream earbud charging cases on the market typically employ fixed or limitedly adjustable physical contact solutions. For example, they may use fixed-position elastic metal pins within the case or provide a limited number of contact modules for users to manually select.

[0003] However, these existing technical solutions have inherent drawbacks: fixed contacts cannot be adapted to headphones with different contact specifications, resulting in charging failure; while limited adjustable solutions (such as manual sliding modules) require user intervention, are cumbersome to operate, and their adjustable levels or positions are discrete and limited, still unable to cover all potential non-standard headphone models. More importantly, even if the headphone contact positions are roughly matched, during transportation or movement, the headphone and charging contacts may experience micro-displacement or fluctuations in contact pressure due to vibration or shaking, leading to poor contact, charging interruption, or even electrical sparks, affecting charging reliability and safety.

[0004] Therefore, designing a universal charging case that can automatically and precisely adapt to different headphone specifications and provide stable and reliable physical contact and electrical connection during charging has become a technical challenge that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a charging case that adapts to earphone specifications. By incorporating a flexible capsule containing magnetorheological material, a magnetic field control component surrounding the capsule, a contact matrix layer attached to the capsule surface, and a controller, the charging case achieves fully automatic shape fitting and electrical recognition of earphone contacts of any size. After recognition, the magnetorheological material is transformed into a high-magnetic-field, solid-state-like locked state through magnetic field control, thereby solidifying and locking the fit between the contact matrix layer and the earphone, improving the stability of the electrical connection and avoiding manual adjustment and poor contact. This solves the problems of poor compatibility due to fixed or limited contact specifications in earphone charging cases, and the impact of unstable contact on charging reliability.

[0006] To achieve the above objectives, the present invention provides a charging case for adaptive earphone specifications, comprising:

[0007] The compartment body, wherein an adaptive cavity is provided within the compartment body; A flexible adapter component is disposed within the adaptive cavity. The flexible adapter component includes a sealed flexible capsule and a magnetorheological material filled within the flexible capsule. A magnetic field control component is disposed around the periphery of the flexible capsule to generate a controllable magnetic field acting on the magnetorheological material. A contact matrix layer is attached to the upper surface of the flexible capsule. The contact matrix layer contains multiple conductive units that are insulated from each other and independently addressed, arranged in an array. The controller is electrically connected to both the magnetic field control component and the contact matrix layer. The controller is configured as follows: Based on the feedback signal from the contact matrix layer, the magnetic field control component is controlled to adjust the magnetic field strength so that the magnetorheological material switches between a low magnetic field liquid flow dynamic and a high magnetic field solid-like locked state.

[0008] Preferably, the controller includes an impedance mapping module configured to perform a scan operation based on spatial topology association logic, including: A detection pulse is applied to each conductive unit in the contact matrix layer according to a preset scanning sequence to obtain the real-time contact impedance value of each conductive unit. The obtained contact impedance values ​​are mapped to a two-dimensional coordinate system corresponding to the spatial position of the contact matrix layer to generate an impedance distribution topology map. Identify connected regions in the impedance distribution topology where the contact impedance value is continuously lower than a first preset threshold, and identify these connected regions as the physical projection regions corresponding to the headphone charging contacts; When the relative difference in contact impedance values ​​between any adjacent conductive units within the connected region is less than a preset percentage, and the average contact impedance value of the connected region is less than a second preset threshold, the controller determines the connected region as a valid contact cluster.

[0009] Preferably, the controller is further configured to perform a dynamic weighted evaluation of the effective contact clusters to determine a target charging path, specifically including: A comprehensive weight value is assigned to each conductive unit within the effective contact cluster. The comprehensive weight value is calculated based on the following factors for the corresponding conductive unit: historical cumulative energization times factor, current temperature rise rate factor, and contact pressure distribution uniformity factor. Based on the comprehensive weight value, conductive units located at the edge of the effective contact cluster and with low comprehensive weight values ​​are avoided. At least one conductive unit located inside the effective contact cluster and with high comprehensive weight values ​​is selected to form an optimized charging current transmission path.

[0010] Preferably, the magnetic field control component is configured to generate a non-uniform magnetic field in the space where the flexible capsule is located, wherein the magnetic induction intensity of the central region of the flexible capsule is 1.2 to 1.5 times that of the edge region of the flexible capsule; Under the low magnetic field liquid flow dynamics, the magnetic field strength generated by the magnetic field control component is controlled to make the apparent viscosity of the magnetorheological material lower than a first viscosity threshold. In the high magnetic field-like solid-state locked state, the magnetic field strength generated by the magnetic field control component is instantaneously increased to the point that the yield stress of the magnetorheological material is higher than the first stress threshold.

[0011] Preferably, the controller implements closed-loop steady-state compensation control based on current feedback for the magnetic field control component, including: Real-time monitoring of the drive current signal of the magnetic field control component; Based on the fluctuation characteristics of the driving current signal, the state changes of the internal microstructure of the magnetorheological material in response to external shear force are deduced. When it is determined that the fluctuation range of the state change exceeds the preset tolerance, the drive signal of the magnetic field control component is adjusted to enhance the magnetic field until the fluctuation range of the state change returns to the preset tolerance range.

[0012] Preferably, the controller further includes an impedance degradation monitoring module, which is configured to: Record the initial and final impedance values ​​of each conductive unit over multiple historical charging cycles. Based on the recorded data, the degradation trend parameter of the impedance of each conductive unit over time is calculated. Conductive units whose degradation trend parameters exceed the warning threshold are marked as performance warning units, and the selection priority of the performance warning units is reduced or eliminated when planning the charging current transmission path.

[0013] Preferably, the controller is configured to execute a load balancing contact rotation strategy, specifically: Within the set of conductive units covered by the effective contact cluster, based on the cumulative energizing load history of each conductive unit, the current charging current is preferentially allocated to the conductive units with lower cumulative energizing load, so as to achieve the equalization of the overall service life of the contact matrix layer.

[0014] Preferably, the controller triggers the high magnetic field-like solid-state locked state based on a composite sensing signal, wherein the triggering conditions include: A Hall sensor installed inside the chamber detected that the rate of change of the magnetic field exceeded a first rate of change threshold; and, A pressure sensor located inside the flexible capsule detected a pressure change exceeding a first pressure threshold. When the event of the magnetic field change rate exceeding a first change rate threshold and the event of the pressure change exceeding a first pressure threshold occur successively within a preset time window, the controller controls the magnetic field control component to enhance the magnetic field to enter the high magnetic field-like solid-state locked state.

[0015] Preferably, the controller further includes an identity verification module, configured as follows: Based on the geometric contour of the effective contact cluster and the contact impedance value distribution characteristics of each conductive unit inside it, an impedance characteristic identifier of the currently placed earphone is generated. The impedance characteristic identifier is compared with the authorized device characteristic identifier pre-stored in the controller; The charging current transmission path is turned on only when the matching degree is higher than the safety threshold; otherwise, it remains disconnected and a prompt message is generated.

[0016] Preferably, the controller is further configured to perform a configuration reset operation after the earphone is removed, including: After the high magnetic field-like solid-state lock-up state is released, the magnetic field control component is controlled to generate an alternating decaying magnetic field with a frequency higher than the power frequency. The alternating decaying magnetic field is used to eliminate residual magnetism in the magnetorheological material and to help the flexible capsule and the magnetorheological material inside it return to their initial flat state under the action of gravity and surface tension.

[0017] The beneficial effects of this invention are as follows: By setting up a flexible capsule containing magnetorheological material, a magnetic field control component surrounding the capsule, a contact matrix layer attached to the surface of the capsule, and a controller, the charging case achieves fully automatic shape fitting and electrical recognition of earphone contacts of any size. After recognition, the magnetorheological material is transformed into a high magnetic field-like solid-state locked state through magnetic field control, thereby solidifying and locking the fitting shape of the contact matrix layer and the earphone, improving the stability of the electrical connection, and avoiding manual adjustment and poor contact. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the exploded structure of the present invention.

[0019] The reference numerals in the figures include: 1. Chamber body; 11. Adaptive cavity; 2. Flexible adaptation component; 3. Magnetic field control component; 4. Contact matrix layer. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings.

[0021] like Figure 1 As shown, a charging case for adaptive earphone specifications according to the present invention includes: The charging case 1 contains an adaptive cavity 11; the adaptive cavity 11 provides physical space and geometric constraints for the insertion of the earphones. It defines the interaction range between the earphones and the internal components of the charging case and is the structural basis for the adaptive process.

[0022] A flexible adapter component 2 is disposed within the adaptive cavity 11. The flexible adapter component 2 includes a sealed flexible capsule and a magnetorheological material filled within the flexible capsule. Utilizing the reversible and rapid changes in apparent viscosity and yield stress of the magnetorheological material under the influence of a magnetic field, as well as the encapsulation and shape transfer functions of the flexible capsule, a physical medium capable of intelligently changing its physical form (from flow to solidification) according to an external magnetic field is provided, providing a material basis for achieving dynamic bonding and locking.

[0023] Among them, the flexible capsule is a multi-layer composite silicone film capsule or a thermoplastic polyurethane film welded capsule formed by peripheral hot pressing or laser welding of two or more layers of medical-grade or food-grade liquid silicone.

[0024] Magnetorheological material is a stable suspension based on silicone oil or synthetic oil as a carrier fluid, with surface-modified carbonyl iron powder dispersed in it. It achieves seamless and rapid control of its rheological state via a magnetic field, perfectly realizing the switching between "liquid self-adaptation" and "solid-state locking" modes, which is the physical basis for the operation of the adaptive charging chamber.

[0025] Low magnetic field liquid flow dynamics: When the magnetic field generated by the magnetic field control component is weak (e.g., <50mT), the apparent viscosity of the material can be maintained at about 50mPa·s, which provides good flowability to wrap the earphone.

[0026] High magnetic field solid-state locking state: When the magnetic field is instantaneously enhanced (e.g., >250mT), the yield stress of this material can rapidly rise to the order of 8-15kPa, providing sufficient static locking force.

[0027] A magnetic field control component 3, surrounding the flexible capsule, generates a controllable magnetic field acting on the magnetorheological material. By changing the excitation current, a magnetic field with controllable intensity and distribution is generated, which penetrates the flexible capsule and acts on the internal magnetorheological material. This provides an external energy field to drive the magnetorheological material to undergo a phase transition, serving as the means to switch between "liquid-state adaptation" and "solid-state-like locking" modes. The magnetic field control component 3 can be a multi-channel independently controllable electromagnetic coil array or a composite component integrating permanent magnets and electromagnetic regulation; both can effectively achieve controllable switching of the magnetorheological material's state.

[0028] A contact matrix layer 4, attached to the upper surface of the flexible capsule, comprises multiple independently addressed conductive units arranged in an array, insulated from each other. The matrix-distributed conductive units form a high-resolution electrical contact sensing plane, and each unit can be individually energized or detected. This achieves high-precision electrical detection and mapping of the irregular headphone contact positions and contours, and provides a physical interface for subsequent precise power supply, solving the problem that fixed contacts cannot adapt to different headphone specifications.

[0029] The conductive units are either etched copper foil units based on flexible printed circuit boards (FPCs) or screen-printed silver paste units based on conductive fabrics. Specifically, the etched copper foil units based on FPCs involve forming regularly arrayed micro-copper foil pads as conductive units on a polyimide (PI) or polyester (PET) flexible circuit board substrate using photolithography and etching processes. Each pad is connected to the addressing lines on the FPC via fine leads, and its surface can be plated with gold or nickel-palladium-gold to improve conductivity and corrosion resistance.

[0030] The conductive fabric-based screen-printed silver paste unit specifically uses a flexible, insulating fabric (such as polyester) as a substrate. Using screen printing technology, conductive silver paste is printed to form isolated dot-like or small-area square conductive patterns, constituting a conductive unit matrix. The patterns are isolated from each other by insulating paste or physical gaps.

[0031] The controller is electrically connected to both the magnetic field control component and the contact matrix layer 4. In practical use, the controller is an embedded system integrating a microprocessor, memory, input / output interfaces, and dedicated logic circuits. The controller is responsible for receiving sensor signals, executing control algorithms, driving actuators, and coordinating the logic of the entire adaptive charging process. The controller can be an integrated controller based on an ARM Cortex-M series MCU or an intelligent controller integrating a Bluetooth SoC and a dedicated ASIC. Integrated controllers based on ARM Cortex-M series MCUs use STMicroelectronics' STM32 series or NXP's LPC series microcontrollers as their core. The chip itself integrates a multi-channel high-precision ADC (for reading contact impedance), multiple PWM outputs (for controlling the magnetic field coil drive), abundant GPIOs (for matrix addressing), and communication interfaces (such as I2C and SPI for connecting Hall effect sensors and pressure sensors).

[0032] The smart controller, which integrates Bluetooth SoC and dedicated ASIC, uses a low-power Bluetooth SoC such as Texas Instruments' (TI) CC26xx series or Nordic's nRF52 series as the main controller, and is paired with a dedicated integrated circuit customized for magnetorheological material driving and matrix sensing.

[0033] The controller is configured as follows: Based on feedback signals from the contact matrix layer 4, the magnetic field control component adjusts the magnetic field strength to switch the magnetorheological material between a low-magnetic-field liquid flow dynamic state and a high-magnetic-field solid-like locked state. The controller forms a closed-loop system of sensing-decision-control. By sensing the contact state through feedback signals from the contact matrix layer 4, it makes decisions and outputs control commands to dynamically adjust the magnetic field strength, thereby controlling the macroscopic mechanical properties of the magnetorheological material. This achieves a fully automatic and adaptive charging docking process. First, passive shape fitting is achieved through liquid flow, then stable locking is formed at a precise location through electrical recognition and selective solidification. This solves the problems of cumbersome manual adjustment, incomplete coverage of limited adjustable schemes, and unreliable charging due to contact pressure fluctuations.

[0034] During operation, the user places the earphones into the adaptive cavity 11 of the charging case 1. The controller first controls the magnetic field control component 3 to output a low-intensity magnetic field, causing the magnetorheological material within the flexible fitting component 2 to be in a low-magnetic-field liquid flow dynamic. Under the influence of the earphones' gravity, the flexible bladder filled with magnetorheological material causes the contact matrix layer 4, which is attached to the upper surface of the flexible bladder, to flow and deform, enveloping the earphone's charging contacts. Some conductive units in the contact matrix layer 4 come into contact with the earphone's charging contacts. The controller obtains feedback signals by scanning each conductive unit in the contact matrix layer 4, identifying the effective contact area with the earphone's charging contacts. Subsequently, the controller controls the magnetic field control component 3 to enhance the magnetic field, causing the magnetorheological material in the corresponding area to transform into a high-magnetic-field, near-solid-state locked state, thereby solidifying and locking the flexible bladder and contact matrix layer 4 in their current fit with the earphones, completing the adaptive and stable connection with the earphone's charging contacts.

[0035] The controller in this embodiment includes an impedance mapping module, which is configured to perform a scan operation based on spatial topology correlation logic, including: Detection pulses are applied to each conductive unit in the contact matrix layer 4 according to a preset scanning sequence to obtain the real-time contact impedance value of each conductive unit. Through electrical pulse scanning, the electrical parameters (impedance) of each conductive unit when in contact with the earphone contact are actively detected. A discrete dataset describing the electrical characteristics of the entire contact interface is obtained, providing a data foundation for spatial mapping.

[0036] The acquired contact impedance values ​​are mapped to a two-dimensional coordinate system corresponding to the spatial position of the contact matrix layer 4 to generate an impedance distribution topology map. Electrical parameter data are associated with the physical coordinates of the conductive units to construct a visualized spatial impedance distribution model. Electrical signals are converted into spatial images, intuitively presenting the spatial shape and location of the low-impedance contact area.

[0037] The system identifies connected regions in the impedance distribution topology map where the contact impedance value is continuously lower than a first preset threshold, and identifies these connected regions as the physical projection regions corresponding to the headphone charging contacts. Based on the preset impedance threshold and image connectivity analysis algorithm, potential contact areas are segmented from the topology map. The effective contact area contours corresponding to the actual headphone contacts are accurately extracted from the complex impedance distribution.

[0038] When the relative difference in contact impedance between any adjacent conductive units within the connected region is less than a preset percentage, and the average contact impedance of the connected region is less than a second preset threshold, the controller determines the connected region as a valid contact cluster. A dual criterion of consistency (small impedance difference) and validity (sufficiently low average impedance) is used to filter candidate regions. False contact signals caused by factors such as dirt or slight contact are eliminated, ensuring that the identified contact areas have good and uniform electrical contact quality, laying the foundation for reliable charging.

[0039] Example 1: Assuming a 4×4 contact matrix layer 4 (16 independent conductive units), the first preset threshold (low impedance identification threshold) is set to 100Ω, the second preset threshold (effective conduction threshold) is set to 50Ω, and the preset percentage (impedance difference rate between adjacent units) is set to 15%.

[0040] 1.1 Initial State and Scanning: When the earphones are placed in the charging case, the controller activates the magnetic field control component 3 to bring the magnetorheological material into a low-magnetic-field liquid flow state. The flexible capsule causes the contact matrix layer 4 to adhere to the bottom of the earphones. The controller then activates the impedance mapping module, applying microampere-level detection pulses to the 16 conductive units sequentially from left to right and from top to bottom.

[0041] The real-time contact impedance values ​​(unit: Ω) obtained by scanning are shown in the table below (coordinates (x, y) represent rows and columns):

[0042] 1.2 Generation of Impedance Distribution Topology Map: The controller maps these discrete impedance values ​​to a two-dimensional coordinate system corresponding to their physical locations, generating an impedance distribution topology map. This map can be intuitively viewed as a "heat map": high impedance regions (>1000Ω) are displayed in "cold colors" (no contact), while the four points at coordinates (2,2), (2,3), (3,2), and (3,3) have significantly lower impedance values ​​(<100Ω) and are displayed in "warm colors," forming a continuous rectangular region in space.

[0043] 1.3 Identifying Physical Projection Areas: The controller identifies connected regions in the topology diagram where the impedance value is continuously lower than a first preset threshold (100Ω). The four low-resistance points mentioned above are adjacent to each other (connected vertically and horizontally), and therefore are identified as the same connected region. This region is initially determined to be the physical projection area corresponding to the headphone charging contacts.

[0044] 1.4 Determine the validity of the contact cluster controller and perform consistency verification on the connected region: Calculate the impedance difference rate between adjacent units: (2,2) and (2,3): |35-28| / 35=20%>15%; (Note: This condition is not met here) (2,2) and (3,2): |35-45| / 45≈22.2%>15%; (Note: This condition is not met here) (2,3) and (3,3): |28-32| / 32=12.5%<15%; (3,2) and (3,3): |45-32| / 45≈28.9%>15%; (Note: This condition is not met here) The calculated average impedance of the region is (35+28+45+32) / 4=35Ω, which is lower than the second preset threshold (50Ω).

[0045] Because multiple pairs of adjacent conductive units within this connected area have an impedance difference rate exceeding 15%, failing to meet the consistency condition, the controller will not classify this area as a valid contact cluster. This may indicate the presence of dirt, uneven contact pressure, or that the area is not a genuine earphone contact, thus preventing charging operations based on incorrect identification.

[0046] 1.5 Comparative Example (assuming ideal contact) Suppose that under another ideal condition, the impedance values ​​obtained by scanning the region are: (2,2)=30Ω, (2,3)=32Ω, (3,2)=29Ω, (3,3)=31Ω.

[0047] Difference rate calculation: The difference rate between all adjacent units is less than (|32-31| / 32≈3.1%), which is far below 15%.

[0048] Average impedance: (30+32+29+31) / 4=30.5Ω, which is below 50Ω. At this point, the controller successfully identifies the connected area as a valid contact cluster, providing a reliable target area for subsequent precise charging path planning.

[0049] This example demonstrates how the impedance mapping module transforms physical contacts into quantifiable spatial electrical data and rigorously filters them using pre-defined topological association logic (connectivity, consistency, validity), thereby accurately distinguishing genuine, healthy headphone contact areas and eliminating unreliable contacts, laying the foundation for stable charging later.

[0050] The controller in this embodiment is further configured to perform a dynamic weighted evaluation of the effective contact clusters to determine the target charging path, specifically including: A comprehensive weight value is assigned to each conductive unit within the effective contact cluster. This comprehensive weight value is calculated based on the following factors for the corresponding conductive unit: historical cumulative energization count factor, current temperature rise rate factor, and contact pressure distribution uniformity factor. A multi-dimensional evaluation model is established to quantify the "health," "thermal risk," and "contact stability" of each conductive unit. This enables a refined and forward-looking evaluation of the performance of each conductive unit within the contact area.

[0051] Based on the comprehensive weight value, conductive units with low comprehensive weight values ​​located at the edge of the effective contact cluster are avoided. At least one conductive unit combination with a high comprehensive weight value located inside the effective contact cluster is selected to form an optimized charging current transmission path. A weighted evaluation and optimization strategy is employed to dynamically plan the physical path of current transmission. This proactively avoids potentially unstable edge regions and performance-degraded units, prioritizing the use of high-performance units in the central region. This results in a highly efficient charging path with low resistance, low thermal risk, and the most stable connection, improving the efficiency and safety of the charging process.

[0052] Example 2: 2.1 For example, a set of contact impedance values ​​(unit: Ω) are shown in the table below (coordinates (x, y) represent rows and columns):

[0053] The connected region formed by the four points (2,2), (2,3), (3,2), and (3,3) not only has an average impedance lower than the second threshold, but also has an impedance difference rate of less than 15% between all adjacent units, thus being determined by the controller as an effective contact cluster.

[0054] 2.2 Dynamic weighted evaluation process: The controller performs a dynamic weighted evaluation of the four conductive units within the effective contact cluster to determine the final charging path. The overall weight value (W) is calculated by weighting the historical cumulative number of energizations (F1), the current instantaneous temperature rise rate (F2), and the contact pressure distribution gradient (F3) with weighting coefficients of 0.4, 0.4, and 0.2 respectively (W = 0.4F1 + 0.4F2 + 0.2). F3). The scoring range for each factor is 0-1, with higher scores indicating better condition.

[0055] Step 1: Calculate the multi-dimensional factors for each unit Historical cumulative power-on count factor (the fewer the historical cumulative power-on counts, the higher the score): Unit (2,2): 120 historical power-on cycles → Score F1=0.7 Unit (2,3): 200 historical power-on cycles → Score F1=0.3 Unit (3,2): 80 historical power-on cycles → Score F1=0.9 Unit (3,3): 150 historical power-on cycles → Score F1=0.5 Current instantaneous temperature rise rate factor (the lower the temperature rise rate, the higher the score): Unit (2,2): Temperature rise rate 0.1°C / s → Score F2 = 0.95 Unit (2,3): Temperature rise rate 0.8°C / s → Score F2=0.6 Unit (3,2): Temperature rise rate 0.15°C / s → Score F2=0.9 Unit (3,3): Temperature rise rate 0.5°C / s → Score F2 = 0.75 Contact pressure distribution gradient factor (calculated based on pressure sensor data inside the flexible capsule; the smaller the gradient and the more uniform the pressure, the higher the score): Unit (2,2): Located at the edge of the contact area, pressure gradient 0.3 → score F3=0.4 Unit (2,3): Located at the edge of the contact area, pressure gradient 0.35 → score F3=0.3 Unit (3,2): Located at the relative center of the contact area, pressure gradient 0.1 → score F3=0.9 Unit (3,3): Located at the relative center of the contact area, pressure gradient 0.15 → score F3=0.8 Step 2: Calculate the overall weight value and make a decision. Unit (2,2): W=0.40.7+0.40.95+0.2 0.4 = 0.740 Unit (2,3): W=0.40.3+0.40.6+0.2 0.3 = 0.420 Unit (3,2): W=0.40.9+0.40.9+0.2 0.9 = 0.900 Unit (3,3): W=0.40.5+0.40.75+0.2 0.8 = 0.660 2.3 Decision-making: The controller plans the path based on the comprehensive weight value.

[0056] Avoid low-weight edge cells: Although cell (2,3) belongs to the effective contact cluster, its weight value is the lowest (0.420) and it is located on the edge, so it is avoided.

[0057] Preferred combinations of internally high-weighted units: Unit (3,2) has the highest weight value (0.900) and is located in the geometric center of the contact cluster, so it is identified as the core charging node.

[0058] The weight values ​​of units (2,2) and (3,3) are acceptable, and they are adjacent to (3,2), so they can be selected as auxiliary parallel nodes to share the current.

[0059] The controller ultimately selects unit (3,2) as the main path and combines units (2,2) and (3,3) to form an optimized, low-thermal-risk composite current transmission path, while discarding unit (2,3) which has the worst performance.

[0060] This process demonstrates how the controller goes beyond simple “connectivity” judgments. By integrating multi-dimensional information such as historical load, real-time thermal behavior, and mechanical contact quality, it performs refined performance classification and screening of units within the effective contact cluster, thereby proactively constructing the optimal and most reliable charging path and achieving intelligent decision-making from “capable charging” to “superior charging”.

[0061] The magnetic field control component of this embodiment is configured to generate a non-uniform magnetic field in the space where the flexible capsule is located, wherein the magnetic induction intensity in the central region of the flexible capsule is 1.2 to 1.5 times that of the edge region of the flexible capsule; through a specific arrangement or excitation control of the magnetic field generating coils, the magnetic field intensity is made to have a gradient distribution in space. This allows the magnetorheological material to preferentially or more strongly solidify in the central region, which is beneficial for forming a more stable support and locking in the central region where the earphone contacts are usually located.

[0062] Under the low magnetic field liquid flow dynamics, the magnetic field strength generated by the magnetic field control component is controlled to keep the apparent viscosity of the magnetorheological material below a first viscosity threshold; the magnetic field strength is controlled within the low viscosity plateau region of the magnetorheological material's rheological curve. This ensures that the magnetorheological material has sufficient fluidity during the fitting stage, allowing it to quickly and fully wrap around and fit headphones of different shapes.

[0063] In the high magnetic field-like solid-state locked state, the magnetic field strength generated by the magnetic field control component is instantaneously increased to the point that the yield stress of the magnetorheological material exceeds a first stress threshold. The magnetic field strength is increased to a level that induces Bingham fluid behavior in the magnetorheological material, resulting in a region with significant yield stress. This allows the material to resist a certain shear force during the locking phase, providing a static locking force to counteract the headphone displacement torque and effectively preventing poor contact caused by vibration.

[0064] Example 3: 3.1 Realization of Non-Uniform Magnetic Field It is assumed that the magnetic field control component consists of a set of concentrically arranged electromagnetic coils. The controller applies differentiated excitation currents to each coil, creating a non-uniform magnetic field in the space surrounding the flexible capsule. Specifically, the current in the coils in the central region is larger, while the current in the coils at the edges is smaller. Measurements show that the magnetic induction intensity B_center at the center point (origin) of the flexible capsule is 180 mT, while the magnetic induction intensity B_edge at the edge of the flexible capsule (e.g., 20 mm from the center) is 130 mT. At this point, B_center / B_edge ≈ 1.38, satisfying the requirement that the magnetic induction intensity in the central region is 1.2 to 1.5 times that of the edge region. This design allows for a stronger curing effect of the magnetorheological material in the central region in the subsequent locked state.

[0065] 3.2 Control of Low-Magnetic-Field Liquid Flow Dynamics During the initial fitting stage after the earphones are inserted, the controller needs to ensure that the magnetorheological material is in a flowable state. The controller keeps the overall excitation current of the magnetic field control component at a low level, maintaining the magnetic field strength of the entire flexible capsule area at approximately 50 mT. Under this magnetic field, the apparent viscosity of the magnetorheological material used (such as a carbonyl iron powder suspension) decreases to 50 mPa·s, far below the set first viscosity threshold (e.g., 100 mPa·s). At this point, the magnetorheological material exhibits properties similar to a Newtonian fluid, and the flexible capsule can freely deform and flow under the gravity of the earphones, tightly wrapping the irregular contours of the bottom of the earphones.

[0066] 3.3 Triggering of High Magnetic Field-like Solid-State Locking State: Once the controller identifies a valid contact cluster through the contact matrix layer 4, locking is triggered. The controller sends a command to the magnetic field control component, significantly increasing the excitation current within milliseconds. The magnetic field strength is instantaneously enhanced, with the magnetic field B_center in the central region jumping from 50mT to 300mT, and the edge region B_edge simultaneously increasing to approximately 220mT. Under this strong magnetic field, the iron particles inside the magnetorheological material instantly form a robust chain structure, and its macroscopic yield stress increases sharply to 8kPa, exceeding the preset first stress threshold (e.g., 5kPa). The material then enters a high magnetic field-like solid-state locking state, losing its fluidity and firmly "freezing" the flexible capsule and contact matrix layer 4, which are already conforming to the shape of the earphone, in place, providing the earphone with vibration-resistant, displacement-resistant mechanical locking and stable electrical contact.

[0067] The controller in this embodiment implements closed-loop steady-state compensation control based on current feedback for the magnetic field control component, including: Real-time monitoring of the drive current signal of the magnetic field control component; Based on the fluctuation characteristics of the driving current signal, the state changes of the internal microstructure of the magnetorheological material against external shear forces are deduced. Specifically, the controller monitors the driving current fluctuations of the magnetic field control component 3 in real time and uses the principle of electromagnetic induction reaction force to calculate the changes in the microscopic shear resistance inside the magnetorheological fluid. The fluctuations of the driving current indirectly reflect the changes in the magnetic field and the work done by the internal microstructure of the magnetorheological material due to external disturbances (such as vibrations). This achieves indirect and real-time monitoring of the stability of the locking state.

[0068] When the fluctuation range of the state change exceeds a preset tolerance, the drive signal of the magnetic field control component is adjusted to enhance the magnetic field until the fluctuation range of the state change returns to the preset tolerance range. Based on monitoring feedback, the magnetic field output is dynamically adjusted to form a closed-loop control. This actively compensates for the attenuation of locking force caused by continuous or sudden external vibrations, making the locking state robust against disturbances and maintaining continuous stability of the contact pressure.

[0069] Example 4: Background: When the charging compartment is in a high magnetic field-like solid-state locked state, the steady-state drive current of the magnetic field control component is 500mA, corresponding to a magnetic flux density of 300mT, maintaining the yield stress of the magnetorheological material at 8kPa. The controller samples and monitors this drive current signal in real time at a frequency of 1kHz.

[0070] Suppose the charging case experiences sudden and continuous vibration during transport, causing the earbuds to undergo slight displacement, which applies dynamic shear force to the solidified magnetorheological material. The chain-like structure of iron particles within the magnetorheological material thus undergoes microscopic deformation and reconstruction, resulting in fluctuations in the overall magnetoresistance of the material. This change is fed back to the coil of the magnetic field control component, manifesting as periodic fluctuations in the drive current signal with an amplitude of ±8% and a frequency related to the vibration.

[0071] The controller's built-in algorithm immediately analyzes the characteristics of this current fluctuation: the fluctuation amplitude (±8%) exceeds the preset tolerance threshold (e.g., ±5%), and the fluctuation frequency is within the typical frequency band of external mechanical disturbances. Based on this, the controller deduces that the ability of the magnetorheological material's internal microstructure to resist external shear forces is fluctuating abnormally, posing a risk of locking force attenuation.

[0072] To compensate for this disturbance, the controller immediately enters a closed-loop compensation mode: the duty cycle of the drive signal is gradually increased every 10ms, raising the average drive current from 500mA to 550mA. The magnetic field strengthens accordingly, causing the internal particle chain structure of the magnetorheological material to be reinforced and stabilized under the stronger magnetic field. After approximately 50ms, the fluctuation amplitude of the drive current signal decays to ±3%, falling back into the preset tolerance range. The controller determines that compensation is complete, maintains the current drive signal, and ensures that the locking state remains stable under continuous vibration.

[0073] Specifically, the controller's built-in algorithm is a composite control algorithm based on disturbance observation and PID (proportional-integral-derivative) regulation. Its core is to map the electrical signal of the drive current fluctuation of the magnetic field control component into a characterization of the locking force stability of the magnetorheological material, and then perform dynamic compensation.

[0074] Algorithm workflow in the example: The detected current fluctuation amplitude jumped from ±0% to +8% / -8% (>±5% preset tolerance), and the spectrum analysis showed that the main energy was at 30Hz (a common vehicle vibration frequency).

[0075] Based on this, the algorithm deduced that: "The magnetorheological material is subjected to an external shear disturbance of about 30Hz, and the stability of the locking force decreases by more than 5%".

[0076] The PID controller immediately calculates and outputs a command to increase the PWM duty cycle by 10%.

[0077] The average driving current increases, the magnetic field strengthens, the yield stress of the magnetorheological material increases, and the internal structure is reinforced.

[0078] After about 50ms, the current fluctuation amplitude is suppressed to ±3% (<±5% preset tolerance), the algorithm determines that a new steady state has been reached, stops large-scale adjustment, and enters maintenance mode.

[0079] Essentially, this algorithm is an intelligent observer and controller that uses current signals as a sensor for the health of locking force. Through three steps—signal analysis, physical model mapping, and PID control—it achieves fully closed-loop automatic compensation, from "sensing electrical anomalies" to "inferring mechanical state" and then to "outputting magnetically enhanced values," directly solving the pain point of "contact pressure fluctuations caused by vibration" in existing technologies.

[0080] The controller in this embodiment further includes an impedance degradation monitoring module, which is configured as follows: The system records the initial and final impedance values ​​of each conductive unit over multiple historical charging cycles. Based on these records, it calculates the impedance degradation trend parameter of each conductive unit over time. By tracking and analyzing the long-term impedance data of the same conductive unit, its performance aging rate is evaluated. This achieves long-term, quantitative monitoring and early warning capabilities for the health status of each conductive unit in the contact matrix layer 4.

[0081] Conductive units whose degradation trend parameters exceed the warning threshold are marked as performance warning units, and their selection priority is reduced or eliminated when planning the charging current transmission path. Health monitoring results are fed back to the path planning decision. This proactive avoidance of conductive units showing performance degradation trends prevents problems such as increased contact resistance and aggravated heat generation due to unit aging, thus improving the long-term reliability of the system.

[0082] Example 5: Assuming that in claim 2 or 3, the controller has identified a valid contact cluster consisting of four conductive units (coordinates: (2,2), (2,3), (3,2), (3,3)), the impedance degradation monitoring module begins operation.

[0083] 5.1 The data recording module continuously records the initial impedance value (measured at the start of charging) and the final impedance value (measured at the end of charging) of each conductive unit within the most recent N=3 complete charging cycles. The data is as follows (unit: Ω):

[0084] 5.2 Degradation Trend Calculation For each unit, the module calculates the slope of the linear fit of its initial impedance value as a function of time (cycle number), which is used as the degradation trend parameter K (unit: Ω / cycle).

[0085] (2,2): Initial value sequence [28.5,29.1,30.0]. The slope K is calculated to be approximately 0.75Ω / cycle.

[0086] (2,3): Initial value sequence [30.1,30.3,30.5]. The slope K is calculated to be approximately 0.20Ω / cycle.

[0087] (3,2): Initial value sequence [29.8, 30.0, 30.1]. The slope K is calculated to be approximately 0.15Ω / cycle.

[0088] (3,3): Initial value sequence [31.0, 31.5, 32.5]. The slope K is calculated to be approximately 0.75Ω / cycle.

[0089] 5.3. Warning marker setting: Warning threshold K_th = 0.50Ω / cycle.

[0090] The conductive unit (2,2) has K=0.75>K_th, and is marked as a performance warning unit.

[0091] The conductive unit (3,3) has K=0.75>K_th, and is marked as a performance warning unit.

[0092] The K values ​​of conductive units (2,3) and (3,2) are both less than the threshold, indicating that the state is normal.

[0093] 5.4. Path Planning Adjustment: During dynamic weighted evaluation (as described in claim 3), the controller uses the aforementioned early warning information as a key factor. Direct weight reduction or exclusion: When calculating the overall weight of conductive units, assign extremely low "health factor" scores (e.g., 0.1) to conductive units (2,2) and (3,3), or directly exclude conductive units marked as warning units from the candidate path units.

[0094] Optimized path: Ultimately, when planning the target charging path, the controller will prioritize or even only use the normally functioning conductive units (2,3) and (3,2) to form the current transmission path, actively avoiding the warning units (2,2) and (3,3) that show an increasing impedance trend.

[0095] Through this monitoring, the system can identify the degradation trend of conductive units (2,2) and (3,3) before the contact resistance of conductive units (2,2) and (3,3) deteriorates significantly due to oxidation, contamination and other reasons. The system can also avoid conductive units marked as warning units in the charging path planning, thereby maintaining the overall charging efficiency and safety and realizing preventive maintenance.

[0096] The controller in this embodiment is configured to execute a load balancing contact rotation strategy, specifically: Within the set of conductive units covered by the effective contact cluster, based on the cumulative energizing load history of each conductive unit, the current charging current is preferentially allocated to conductive units with lower cumulative energizing loads to achieve a more balanced overall lifespan for the contact matrix layer 4. The historical workload of each unit (cumulative energizing time, integral of current and time, etc.) is recorded and compared to dynamically allocate the current workload. This ensures that the operating losses of each conductive unit in the contact matrix layer 4 are more uniform, preventing premature failure of some units due to prolonged overload and extending the overall lifespan of the contact matrix layer 4.

[0097] Example 6: Assume that, based on previous identification and evaluation, the controller determines that the currently effective contact cluster for charging consists of conductive units A(2,2), B(2,3), C(3,2), and D(3,3). The controller internally maintains a database recording the accumulated energized load history of each conductive unit. This load can be quantified as "ampere-minutes" (A·min), which is the integral of the current flowing through the unit over time.

[0098] At the time of this charging event, the controller retrieved the following historical data on the cumulative load of each conductive unit: Conductive unit A(2,2): Cumulative load 1520 A·min Conductive unit B(2,3): Cumulative load 735 A·min Conductive unit C(3,2): Cumulative load 980 A·min Conductive unit D(3,3): Cumulative load 1200 A·min 6.1 Load Balancing Decision Process: Sorting and Selection: Based on the principle of "prioritizing current distribution to conductive units with lower cumulative energized loads", the controller sorts the four units within the effective contact cluster in ascending order of load value: B(735). <C(980)<D(1200)<A(1520)。

[0099] Path planning: The controller plans to construct a charging path consisting of two conductive units connected in parallel. Based on the ranking results, conductive units B and C with the lowest load are preferentially selected as the current transmission path for this charging operation.

[0100] Execution and Recording: At the start of charging, current mainly flows through conductive units B and C. The controller accumulates the energizing time and current of this charging operation in real time, and updates the accumulated load history of conductive units B and C after charging is completed (e.g., by approximately 50 A·min for each).

[0101] 6.2 Strategy Effect Demonstration: After this charging: The load of conductive unit B is updated to ~785 A·min, and that of conductive unit C is ~1030 A·min. The loads of conductive unit A and conductive unit D remain unchanged.

[0102] During the next charging: The controller performs the load sorting again. Suppose the sorting becomes: B(785)≈D(1200)<C(1030)<A(1520) (Note: At this time, the load of conductive unit B is still close to the lowest, and the relative load value of conductive unit D becomes lower because it is not used). The controller may select conductive unit B and conductive unit D as the new charging paths, allowing the previously higher-loaded conductive unit A and conductive unit C to "rest".

[0103] Through this intelligent rotation strategy based on historical loads, the wear and aging progress of all available conductive units in the contact matrix layer 4 is balanced. This avoids the premature failure of conductive units caused by only a few fixed conductive units undertaking all charging tasks (for example, if conductive unit A is continuously used, its load will be much higher than other conductive units), thereby extending the service life of the entire contact matrix layer 4 as a whole and improving the long-term reliability of the charging bin.

[0104] The controller of this embodiment triggers the high magnetic field quasi-solid state lock based on the composite sensing signal, where the triggering conditions include: The Hall sensor disposed in the housing 1 detects that the magnetic field change rate exceeds the first change rate threshold; and, the pressure sensor disposed inside the flexible bladder detects that the pressure change exceeds the first pressure threshold; comprehensively using the magnetic field change signal representing the action of closing the lid and the pressure impact signal representing the action of putting the earphone in. It realizes an accurate and reliable judgment of the user intention of "the earphone has been put in and is ready", avoiding mis-triggering by a single sensor.

[0105] When the event that the magnetic field change rate exceeds the first change rate threshold and the event that the pressure change exceeds the first pressure threshold occur successively within a preset time window, the controller controls the magnetic field control component to enhance the magnetic field to enter the high magnetic field quasi-solid state lock. Set the time correlation criterion, requiring the two signals to occur continuously within a short time. Further improving the accuracy and fault tolerance of the trigger judgment, ensuring that the adaptive locking process starts only at the correct time.

[0106] Example 7: In a charging bin that adapts to the earphone specifications, the controller makes a composite judgment based on the signals of the Hall sensor and the pressure sensor to accurately trigger the high magnetic field quasi-solid state lock. The specific implementation is as follows: 7.1. Sensor setting and threshold The chamber 1 is equipped with a cover for closing the adaptive cavity 11. The cover is rotatably connected to the chamber 1. A Hall sensor is located inside the chamber 1 near the pivot to detect changes in the magnetic field caused by the opening and closing of the cover. A first rate of change threshold is set to 100 G / s (Gauss per second) to identify rapid cover-closing actions.

[0107] Pressure sensor: Embedded inside the flexible capsule, used to detect changes in internal pressure caused by compression. A first pressure threshold of 1.5 N (Newtons) is set to detect sudden pressure changes caused by inserting the earphone.

[0108] Preset time window: set to 500 milliseconds.

[0109] 7.2 Triggering Process Simulation Event 1 (Capsule Closure): The user closes the charging compartment lid. The Hall sensor detects a rapid change in magnetic field strength from 50G to 250G within 200 milliseconds. The calculated rate of change is (250-50)G / 0.2s = 1000G / s. This value far exceeds the first rate of change threshold (100G / s). The controller records the "Magnetic Field Rate of Change Exceeds Threshold Event" and initiates a 500-millisecond time window to wait for a pressure signal.

[0110] Event 2 (Earphone Insertion): Within 300 milliseconds of the case lid closing, the user inserts the earphones into the adaptive cavity 11. The bottom of the earphones presses against the flexible bladder, causing the pressure sensor reading to increase from 0.5N to 2.8N within 150 milliseconds, a pressure change of 2.3N, exceeding the first pressure threshold (1.5N). The controller records the "Pressure Change Exceeds Threshold Event" as occurring.

[0111] Composite logic determination: The controller detects that the "magnetic field change rate exceeds threshold event" and the "pressure change exceeds threshold event" occur successively within a preset time window of 500 milliseconds (with an interval of 300 milliseconds).

[0112] Triggering action: When the judgment condition is met, the controller immediately sends a command to the magnetic field control component to instantly enhance the magnetic field, causing the magnetorheological material to enter a high magnetic field-like solid-state locking state, thus completing the adaptive locking of the headphones.

[0113] 7.3 Anti-false triggering mechanism This compound logic effectively prevents accidental triggering: If the lid is closed but the headphones are not inserted: only the Hall sensor signal is received, and no pressure sensor signal responds within the time window, thus not triggering the lock.

[0114] External accidental touch or vibration: Only the pressure sensor generates a transient fluctuation signal, but there is no rapid magnetic field change signal corresponding to the closure of the compartment cover, so the locking is not triggered.

[0115] This example demonstrates how the temporal correlation of signals from dual sensors can accurately determine a user's full intent to "close the lid and put in the earphones," thereby initiating the lock at the correct time and ensuring the accuracy and reliability of the operation.

[0116] The controller in this embodiment further includes an identity verification module, which is configured as follows: Based on the geometric contour of the effective contact cluster and the contact impedance distribution characteristics of each conductive unit within it, an impedance characteristic identifier for the currently placed earphone is generated; the physical shape and electrical characteristic distribution of the contact area are fused to form a unique "fingerprint" for the device. This achieves the extraction of the identity characteristics of the charging device.

[0117] The impedance characteristic identifier is compared with the authorized device characteristic identifier pre-stored in the controller; The charging current transmission path is only activated when the matching degree is higher than a safety threshold; otherwise, it remains disconnected and a prompt message is generated. Feature matching and security policy decisions are performed. Hardware-level device authentication is provided to prevent unauthorized or unqualified devices from charging, improving the safety and controllability of the charging process.

[0118] Example 8: The identity verification module in the controller is activated after a valid contact cluster is identified. Assume that the currently identified valid contact cluster covers four conductive units of the contact matrix layer 4: A(2,2), B(2,3), C(3,2), and D(3,3), forming a 2x2 rectangular outline.

[0119] 8.1 Generation Impedance Characteristic Identification The identity verification module extracts the feature data of this valid contact cluster: Geometric profile features: The conductive units within the effective contact cluster form a square with a side length equal to the unit spacing, and the center coordinates are approximately (2.5, 2.5).

[0120] Impedance distribution characteristics: The contact impedance values ​​of each conductive unit measured in real time are: A=32Ω, B=35Ω, C=28Ω, D=40Ω. The module encodes the above spatial and electrical information to generate an impedance characteristic identifier for the current earphone, such as a feature vector: [shape parameter = square, center X=2.5, center Y=2.5, impedance distribution = (32,35,28,40)].

[0121] 8.2 Comparison with pre-stored authorization identifier The controller's memory pre-stores compliant feature identifiers for authorized headphone models. For example, the feature identifier for the authorized headphone "Model X" is: [shape parameter = square, center X = 2.5, center Y = 2.5, impedance distribution = (30, 33, 29, 38)]. The identity verification module calculates the matching degree between the current feature identifier and the pre-stored identifiers (e.g., calculating the cross-correlation coefficient between two impedance distribution vectors). The calculated cross-correlation coefficient between the current identifier and the "Model X" identifier reaches 0.95.

[0122] 8.3 Verification of Judgments and Execution The preset safety threshold is 0.85. Since the current matching degree (0.95) is higher than the safety threshold (0.85), the controller determines that the currently placed earphone is an authorized device "Model X". Therefore, the controller allows the previously planned charging current transmission path to be activated (e.g., through conductive unit A and conductive unit C) to begin charging the earphone.

[0123] 8.4 Comparison of unauthorized device scenarios If an unauthorized or counterfeit earphone is inserted, its generated impedance characteristic might be: [shape parameter = irregular shape, center X = 3.0, center Y = 2.0, impedance distribution = (120, 95, 110, ∞)]. After comparing with all pre-stored identifiers, the highest cross-correlation coefficient is only 0.3, far below the safety threshold of 0.85. At this time, the controller will keep the charging circuit disconnected and will either flash the indicator light on the charging case red or send a "device not recognized" message to the paired mobile phone, refusing to charge.

[0124] This identity verification process utilizes the physical layout (geometric profile) and electrical characteristics (impedance distribution) of the earphone contacts to form a unique "hardware fingerprint," achieving device-level physical identity authentication. This effectively prevents unauthorized, incompatible, or counterfeit devices from accessing the charging circuit, thereby enhancing the system's security and reliability.

[0125] The controller in this embodiment is also configured to perform a form reset operation after the earphone is removed, including: After the high-magnetic-field solid-state locking state is released, the magnetic field control component generates an alternating decaying magnetic field with a frequency higher than the power frequency; utilizing the demagnetizing effect of the high-frequency alternating magnetic field, the residual magnetism that may have been generated in the magnetorheological material due to the previous locking cycle is effectively eliminated, preventing residual solidification effects from affecting the flowability of the next adaptation.

[0126] The alternating decaying magnetic field is used to eliminate residual magnetism in the magnetorheological material and assist the flexible capsule and its internal magnetorheological material in restoring to their initial flat state under the influence of gravity and surface tension. Demagnetization eliminates the mechanical interlocking of the internal magnetic particle structure, allowing the material to fully recover its Newtonian fluid properties, which is beneficial for leveling under natural forces. This ensures that the flexible adaptor component 2 can restore a consistent initial flat shape before each operation, guaranteeing the repeatability and consistency of the adaptive process.

[0127] Example 9: When the earbuds are removed from the charging case, the controller performs a configuration reset operation according to the following procedure: 9.1 Unlocking: The controller first cuts off the main locking magnetic field of the magnetic field control component, causing the system to exit the high magnetic field-like solid-state locked state. At this time, the magnetorheological material loses the external strong magnetic field constraint, but its interior may retain some ordered structure (remanence) due to the hysteresis effect, resulting in the material not fully recovering its fluidity, and the flexible capsule may retain some deformation.

[0128] 9.2 Applying an alternating decaying magnetic field: The controller then initiates a reset procedure, controlling the magnetic field control component to generate an alternating magnetic field with a frequency of 60Hz (higher than the 50Hz power frequency) and an initial amplitude of 50mT, which decays exponentially to zero within 3 seconds. The magnetization direction of this alternating decaying magnetic field continuously switches between positive and negative.

[0129] 9.3 Eliminating residual magnetism and restoring flatness: Eliminating residual magnetism: A high-frequency alternating magnetic field is used to stir the magnetorheological material, disrupting the chain structure of residual iron particles, so that the residual magnetism inside the material is quickly neutralized and eliminated.

[0130] Assisted leveling: After the residual magnetism is eliminated, the magnetorheological material completely reverts to a low-viscosity Newtonian fluid. At the same time, the weak magnetostrictive vibrations generated during the decay of the alternating magnetic field, together with the material's own gravity and surface tension, promote the uniform flow and leveling of the material within the flexible capsule.

[0131] About 3 seconds later, the magnetic field disappeared completely, and the flexible capsule and the magnetorheological material inside it returned to their initial, completely flat horizontal reference state under the action of gravity.

[0132] This process ensures that the flexible adapter component 2 can be restored to a consistent and flat initial shape before each charging, eliminating residual deformation or magnetic memory from the previous use cycle, thereby ensuring the repeatability and consistency of the subsequent adaptive bonding process.

[0133] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A charging case that adapts to earphone specifications, characterized in that, include: The compartment (1) is provided with an adaptive cavity (11). A flexible adapter component (2) is disposed within the adaptive cavity (11). The flexible adapter component (2) includes a sealed flexible capsule and a magnetorheological material filled within the flexible capsule. A magnetic field control component (3) is arranged around the periphery of the flexible capsule to generate a controllable magnetic field acting on the magnetorheological material. A contact matrix layer (4) is attached to the upper surface of the flexible capsule. The contact matrix layer (4) contains multiple conductive units that are insulated from each other and independently addressed in an array. The controller is electrically connected to the magnetic field control component and the contact matrix layer (4), respectively; The controller is configured as follows: Based on the feedback signal from the contact matrix layer (4), the magnetic field control component is controlled to adjust the magnetic field strength so that the magnetorheological material switches between a low magnetic field liquid flow dynamic and a high magnetic field solid-like locked state.

2. The charging case for adaptive earphone specifications according to claim 1, characterized in that, The controller includes an impedance mapping module configured to perform a scan operation based on spatial topology association logic, including: According to the preset scanning sequence, a detection pulse is applied to each conductive unit in the contact matrix layer (4) to obtain the real-time contact impedance value of each conductive unit; The obtained contact impedance values ​​are mapped to a two-dimensional coordinate system corresponding to the spatial position of the contact matrix layer (4) to generate an impedance distribution topology map; Identify connected regions in the impedance distribution topology where the contact impedance value is continuously lower than a first preset threshold, and identify these connected regions as the physical projection regions corresponding to the headphone charging contacts; When the relative difference in contact impedance values ​​between any adjacent conductive units within the connected region is less than a preset percentage, and the average contact impedance value of the connected region is less than a second preset threshold, the controller determines the connected region as a valid contact cluster.

3. The charging case for adaptive earphone specifications according to claim 2, characterized in that, The controller is also configured to perform a dynamic weighted evaluation of the effective contact clusters to determine a target charging path, specifically including: A comprehensive weight value is assigned to each conductive unit within the effective contact cluster. The comprehensive weight value is calculated based on the following factors for the corresponding conductive unit: historical cumulative energization times factor, current temperature rise rate factor, and contact pressure distribution uniformity factor. Based on the comprehensive weight value, conductive units located at the edge of the effective contact cluster and with low comprehensive weight values ​​are avoided. At least one conductive unit located inside the effective contact cluster and with high comprehensive weight values ​​is selected to form an optimized charging current transmission path.

4. A charging case for adaptive earphone specifications according to any one of claims 1 to 3, characterized in that, The magnetic field control component is configured to generate a non-uniform magnetic field in the space where the flexible capsule is located, wherein the magnetic induction intensity of the central region of the flexible capsule is 1.2 to 1.5 times that of the edge region of the flexible capsule. Under the low magnetic field liquid flow dynamics, the magnetic field strength generated by the magnetic field control component is controlled to make the apparent viscosity of the magnetorheological material lower than a first viscosity threshold. In the high magnetic field-like solid-state locked state, the magnetic field strength generated by the magnetic field control component is instantaneously increased to the point that the yield stress of the magnetorheological material is higher than the first stress threshold.

5. A charging case with adaptive earphone specifications according to claim 4, characterized in that, The controller implements closed-loop steady-state compensation control based on current feedback for the magnetic field control component, including: Real-time monitoring of the drive current signal of the magnetic field control component; Based on the fluctuation characteristics of the driving current signal, the state changes of the internal microstructure of the magnetorheological material in response to external shear force are deduced. When it is determined that the fluctuation range of the state change exceeds the preset tolerance, the drive signal of the magnetic field control component is adjusted to enhance the magnetic field until the fluctuation range of the state change returns to the preset tolerance range.

6. The charging case for adaptive earphone specifications according to claim 3, characterized in that, The controller further includes an impedance degradation monitoring module, which is configured to: Record the initial and final impedance values ​​of each conductive unit over multiple historical charging cycles. Based on the recorded data, the degradation trend parameter of the impedance of each conductive unit over time is calculated. Conductive units whose degradation trend parameters exceed the warning threshold are marked as performance warning units, and the selection priority of the performance warning units is reduced or eliminated when planning the charging current transmission path.

7. A charging case for adaptive earphone specifications according to claim 6, characterized in that, The controller is configured to execute a load balancing contact rotation strategy, specifically: Within the set of conductive units covered by the effective contact cluster, based on the cumulative energizing load history of each conductive unit, the current charging current is preferentially allocated to the conductive units with lower cumulative energizing load, so as to achieve the equalization of the overall service life of the contact matrix layer (4).

8. A charging case with adaptive earphone specifications according to claim 1, characterized in that, The controller triggers the high magnetic field-like solid-state locked state based on a composite sensing signal, wherein the triggering conditions include: A Hall sensor installed inside the chamber (1) detects that the rate of change of the magnetic field exceeds a first rate of change threshold; and, A pressure sensor located inside the flexible capsule detected a pressure change exceeding a first pressure threshold. When the event of the magnetic field change rate exceeding a first change rate threshold and the event of the pressure change exceeding a first pressure threshold occur successively within a preset time window, the controller controls the magnetic field control component to enhance the magnetic field to enter the high magnetic field-like solid-state locked state.

9. A charging case for adaptive earphone specifications according to claim 3, characterized in that, The controller also includes an identity verification module, configured as follows: Based on the geometric contour of the effective contact cluster and the contact impedance value distribution characteristics of each conductive unit inside it, an impedance characteristic identifier of the currently placed earphone is generated. The impedance characteristic identifier is compared with the authorized device characteristic identifier pre-stored in the controller; The charging current transmission path is turned on only when the matching degree is higher than the safety threshold; otherwise, it remains disconnected and a prompt message is generated.

10. A charging case with adaptive earphone specifications according to claim 1, characterized in that, The controller is also configured to perform a configuration reset operation after the earphone is removed, including: After the high magnetic field-like solid-state lock-up state is released, the magnetic field control component is controlled to generate an alternating decaying magnetic field with a frequency higher than the power frequency. The alternating decaying magnetic field is used to eliminate residual magnetism in the magnetorheological material and to help the flexible capsule and the magnetorheological material inside it return to their initial flat state under the action of gravity and surface tension.

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