Wearing detection circuit, control circuit of wearable device and wearable device

Abstract

The application discloses a wearing detection circuit, a control circuit of a wearable device and the wearable device. The wearing detection circuit is used for detecting a wearing state of the wearable device, and comprises a control unit and a first conductor layer and a second conductor layer arranged in the wearable device from the user side to the shell of the wearable device in sequence. The control unit is connected with the first conductor layer and the second conductor layer respectively. The second conductor layer is used for providing a shielding function for the first conductor layer. The control unit is used for acquiring a first signal representing a capacitance between the first conductor layer and a ground end, and identifying the wearing state of the wearable device according to the first signal. The wearing detection circuit provided by the application has strong anti-interference ability and high stability.

Description

Technical Field

[0001] This application relates to the field of circuit technology, specifically to a wear detection circuit, a control circuit for a wearable device, and a wearable device. Background Technology

[0002] Consumer electronics are evolving towards greater intelligence and energy efficiency. The demand for intelligent control in wearable devices such as headphones, smart bracelets, AR (Augmented Reality) glasses, and / or other wearable devices worn on specific parts of the body to monitor the user's status is becoming increasingly apparent. Taking headphones as an example, with the introduction of intelligent technology, these headphones have eliminated traditional power buttons and introduced wear detection functionality. When a user puts on the headphones, they automatically turn on; when the user removes them, they automatically enter sleep or power-off mode. Applying wear detection functionality to wearable devices like headphones not only demonstrates technological intelligence but also helps extend the lifespan of these devices.

[0003] Currently, wear detection solutions on wearable devices are easily interfered with by user activities outside the wearable device. For example, if a user puts their hand on the outside of the earphone after wearing it, the corresponding wear detection module may determine that the earphone is unworn. This shows that traditional wear detection solutions have low anti-interference capabilities. Summary of the Invention

[0004] In view of this, this application provides a wear detection circuit, a control circuit for a wearable device, and a wearable device to solve the problem of low anti-interference capability of existing wear detection solutions.

[0005] This application provides a wear detection circuit for detecting the wearing status of a wearable device. The wear detection circuit includes a control unit and a first conductor layer and a second conductor layer disposed inside the wearable device and arranged sequentially from the user side toward the housing of the wearable device. The control unit is connected to the first conductor layer and the second conductor layer respectively.

[0006] The second conductor layer is used to provide shielding for the first conductor layer;

[0007] The control unit is used to acquire a first signal characterizing the capacitance between the first conductor layer and the ground terminal, and to identify the wearing status of the wearable device based on the first signal.

[0008] Optionally, the wear detection circuit further includes a third conductor layer disposed between the first conductor layer and the second conductor layer, the third conductor layer being connected to the control unit; the third conductor layer is used to generate a second signal to compensate for the first signal; the control unit is also used to acquire the second signal, use the second signal to compensate for the first signal, and identify the wear status of the wearable device based on the compensated signal.

[0009] Optionally, the control unit includes a first pin connected to the first conductor layer, a second pin connected to the second conductor layer, and a third pin connected to the third conductor layer; the control unit is also configured to configure the functions of the first pin, the second pin, and the third pin respectively, so as to obtain the first signal through the first pin and the second signal through the third pin.

[0010] Optionally, the control unit is further configured to configure the second pin and the third pin as shielded pins, configure the first pin as a detection pin to obtain the first signal through the first pin, configure the first pin and the second pin as shielded pins, and configure the third pin as a detection pin to obtain the second signal through the third pin.

[0011] Optionally, the first conductor layer, the second conductor layer, and the third conductor layer have the same shape and / or material.

[0012] Optionally, the edge of the second conductor layer extends beyond the edge of the first conductor layer; and / or, the edge of the first conductor layer extends beyond the edge of the third conductor layer.

[0013] Optionally, the first conductor layer, the second conductor layer, and the third conductor layer are stacked sequentially and insulated from each other.

[0014] Optionally, the first conductor layer, the second conductor layer, and the third conductor layer are all flexible layers.

[0015] Optionally, the control unit is further configured to obtain the difference between the first signal and the second signal; if the difference is greater than or equal to a preset detection threshold, it is determined that the wearable device is currently in a wearing state; if the difference is less than the detection threshold, it is determined that the wearable device is currently in a non-wearing state.

[0016] Optionally, the second conductor layer covers the inside of the housing of the wearable device.

[0017] This application also provides a control circuit for a wearable device, including any of the above-described wear detection circuits and a control chip; the control chip is used to acquire the wear state detected by the wear detection circuit for the wearable device, and to control the wearable device according to the wear state.

[0018] Optionally, the control chip is further configured to turn on the wearable device when it is in a wearing state, and turn off the wearable device when it is not in a wearing state.

[0019] This application also provides a wearable device, including any wear detection circuit or any control circuit for a wearable device.

[0020] Optionally, the wearable device detection includes headphones; the headphones further include a headphone shell, an earpiece, and a playback component; the headphone shell and the earpiece are nested together to form an internal space, and the playback component and the headphone control circuit are located in the internal space.

[0021] Optionally, the headphones also include a headband, with both ends of the headband connected to the headphone housing or to the ear-mounted parts, so that when the user wears the headphones, the ear-mounted parts fit against the user's ears.

[0022] The wear detection circuit, wearable device control circuit, and wearable device described in this application are provided with a first conductor layer and a second conductor layer in sequence from the user side to the housing of the wearable device. This allows the second conductor layer to shield the first conductor layer from various interferences caused by objects such as the user's hand, other people's hands, other people's heads, and / or related conductors approaching the outside of the wearable device. This improves the stability of the first conductor layer in the corresponding detection process, improves the stability of the first signal acquired by the control unit, and thus improves the anti-interference capability and reliability of the entire wear detection process.

[0023] This application also provides a third conductor layer between the first conductor layer and the second conductor layer, so that the control unit can also acquire a second signal and use the second signal to compensate for the first signal. This can eliminate or weaken the interference of environmental factors such as temperature on the first signal, and further improve the accuracy of the wear status detected by the control unit for the wearable device.

[0024] By rationally configuring the functions of each pin in the control unit, the required first and second signals can be obtained respectively without adding related components. This improves the accuracy of the wear detection process, has a simple circuit structure, and can reduce the related costs of the wear detection circuit. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a wear detection circuit according to an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the wear detection circuit structure according to another embodiment of this application;

[0028] Figure 3a , Figure 3b and Figure 3c This is a schematic diagram of the layer structure according to an embodiment of this application;

[0029] Figure 4a and Figure 4b This is a schematic diagram of the conductor layer arrangement according to an embodiment of this application;

[0030] Figure 5a and Figure 5b This is a schematic diagram of conductor layer stacking according to an embodiment of this application;

[0031] Figure 6 This is a schematic diagram of the working process of the control unit according to an embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the headphone body according to an embodiment of this application;

[0033] Figure 8 This is a schematic diagram of an earphone according to an embodiment of this application. Detailed Implementation

[0034] The inventors studied headphones, especially over-ear headphones, examining traditional wear detection methods. They found that some methods place a first capacitive sensor near the inside of the earcup and a second capacitive sensor away from it. The method determines whether the headphones are being worn by measuring the capacitance of the first and second capacitive sensors relative to ground and comparing the difference to a preset threshold. Further investigation revealed that when a user puts the headphones on and then grasps the earcup shell, the headphones are supposedly unworn, even though the user hasn't actually removed them. After discovering this issue, the inventors studied the relevant circuit structure and found that when the headphones are normally worn, the capacitance of the first capacitive sensor is larger than that of the second. If the difference between the two exceeds a preset threshold, the headphones are considered to be worn. When a user grasps and puts a pair of headphones on their head, the second capacitive sensor is closer to the user's skin, while the first capacitive sensor is not yet close to the skin near the ear. In this state, the second capacitance value is greater than the first capacitance value, and the difference between the two values ​​is negative, which is necessarily less than a preset threshold. Therefore, the headphones can be determined to be in an unworn state. However, if the headphones are already on the head, and the user then grasps the headphones, the difference between the first and second capacitance values ​​is very likely to fall below the threshold, leading to a false alarm of the wearing status. This results in low stability of the headphone's wearing detection function and affects the user's actual experience.

[0035] To address the aforementioned issues, this application provides a first conductor layer and a second conductor layer sequentially from the user side towards the casing of the wearable device. This allows the second conductor layer to shield the first conductor layer from various interferences caused by objects such as the user's hand, other people's hands, other people's heads, and / or related conductors approaching the outside of the wearable device. This avoids misunderstandings regarding the wear status and improves the anti-interference capability and reliability of the corresponding wear detection process.

[0036] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In the absence of conflict, the following embodiments and their technical features can be combined with each other.

[0037] The first aspect of this application provides a wear detection circuit for detecting the wearing status of a wearable device, such as headphones, smart bracelets, smart rings, and / or smart glasses (e.g., AR glasses), which are easily interfered with by objects such as the user's hand after being worn. (Refer to...) Figure 1 As shown, the wear detection circuit includes a control unit 110, and a first conductor layer 120 and a second conductor layer 130 disposed inside the wearable device and arranged sequentially from the user side toward the housing of the wearable device. The control unit 110 is connected to the first conductor layer 120 and the second conductor layer 130 respectively. The second conductor layer 130 is used to provide shielding for the first conductor layer 120. The control unit 110 is used to acquire a first signal characterizing the capacitance between the first conductor layer 120 and the ground terminal, and to identify the wearing state of the wearable device based on the first signal.

[0038] The aforementioned wearable devices, which may also be referred to as wearable devices in some cases, can include smart control devices that respond to at least one of the user's needs after the user wears or is wearing them. These include headphones, smart rings that can monitor at least one state of the user's fingers after being worn, smart bracelets, smart massagers that provide massage functions after being worn, smart glasses, and / or smart monitoring instruments used to monitor the user's heart rate and other body indicators after being worn. These devices can automatically turn on after the user wears them and automatically turn off after the user removes them (e.g., unwearing them) to achieve their smart control functions.

[0039] Specifically, the capacitance between the first conductor layer 120 and the ground terminal may include the capacitance between the first conductor layer 120 and a conductor located inside the wearable device and connected to the ground terminal. The inside of the wearable device may include the side inside the housing of the wearable device, and the outside of the wearable device may include the side outside the housing of the wearable device. Taking headphones as an example, the inside of a wearable device like headphones includes the side that touches the ear or enters the ear when the user wears the headphones, and the outside includes the side opposite to the side that touches the ear or enters the ear. This capacitance is affected by the proximity of a target such as a human body, and the first signal characterizing this capacitance can characterize whether the wearable device such as headphones is being worn by the user. The second conductor layer 130 may include a conductor layer such as a metal layer. This conductor layer can shield the first conductor layer 120 from various interferences caused by the user's hand, other people's hands, heads, and / or related conductors approaching the outside of the wearable device, thereby improving the stability of the first conductor layer 120 in the corresponding detection process and thus improving the anti-interference capability and stability of the entire wearing detection process. Optionally, the control unit 110 can set relevant detection thresholds based on the changing characteristics of the first conductor layer 120 when approached by a target such as a human body, and identify the wearing status of the wearable device based on the relationship between the detection threshold and the first signal. For example, when the first signal is greater than or equal to the detection threshold, it is determined that the wearable device is in a wearing state; when the first signal is less than the detection threshold, it is determined that the wearable device is currently in an unwearing state, etc., so as to efficiently and stably identify the wearing status of the wearable device.

[0040] In one example, refer to Figure 2 As shown, the wear detection circuit further includes a third conductor layer 140 disposed between the first conductor layer 120 and the second conductor layer 130, the third conductor layer 140 being connected to the control unit 110; the third conductor layer 140 is used to generate a second signal to compensate for the first signal; the control unit 110 is also used to acquire the second signal, use the second signal to compensate for the first signal, and identify the wear status of the wearable device based on the compensated signal.

[0041] The second signal can characterize the capacitance between the third conductor layer 140 and the ground terminal, and is used to compensate for the first signal to eliminate or weaken the interference of environmental factors such as temperature on the first signal, thereby improving the accuracy of the wearing status detected by the control unit 110 for the wearable device. Optionally, the second signal and the first signal include signals of the same type, such as both including current signals or both including voltage signals, etc., to simplify the corresponding compensation process and improve compensation efficiency. Optionally, the control unit 110 can compensate for the first signal by subtraction, such as subtracting the first signal from the second signal, etc., which, while eliminating or weakening the interference of environmental factors such as temperature on the corresponding wearing detection process, can also simplify the calculation of the compensation process and improve compensation efficiency.

[0042] In one embodiment, the control unit includes a first pin connected to the first conductor layer, a second pin connected to the second conductor layer, and a third pin connected to the third conductor layer. The control unit is further configured to configure the functions of the first pin, the second pin, and the third pin respectively, so as to obtain the first signal through the first pin and the second signal through the third pin. This embodiment places each conductor layer inside the wearable device, and uses each pin of the control unit to connect to the corresponding conductor layer, which simplifies the structure of the wear detection circuit and reduces the power consumption and related production costs during the wear detection process. By rationally configuring the functions of each pin, the control unit can obtain the required first and second signals without adding related components, improving the accuracy of the wear detection process while having a simple circuit structure and reducing the related costs of the wear detection circuit.

[0043] In one example, the control unit is further configured to configure the second pin and the third pin as shielded pins, configure the first pin as a detection pin to obtain the first signal through the first pin, configure the first pin and the second pin as shielded pins, and configure the third pin as a detection pin to obtain the second signal through the third pin, so as to accurately and orderly read the first signal and the second signal without adding other components.

[0044] In one embodiment, the first conductor layer, the second conductor layer, and the third conductor layer have the same shape, such as all three being rectangular, to simplify the manufacturing process of the corresponding wear detection circuit. The fact that the first conductor layer and the third conductor layer have the same shape also makes the capacitance change characteristics between the first conductor layer and the ground terminal consistent, thereby improving the effect of using the second signal corresponding to the third conductor to compensate the first signal corresponding to the first conductor.

[0045] In one example, the first, second, and third conductor layers are made of the same material to simplify the manufacturing process for the corresponding wear detection circuit and further improve production efficiency.

[0046] In one example, the intralayer structural characteristics of each conductor layer, such as the first conductor layer, the second conductor layer, and the third conductor layer, can be determined based on factors such as relevant process conditions. These three characteristics can each include... Figure 3a The solid conductor layer shown is such as a copper layer and / or an aluminum layer, etc. In another example, the second conductor layer may include... Figure 3a The solid conductor layer shown is used to ensure shielding performance. The second and third conductor layers may also include... Figure 3b or Figure 3cThe grid conductor layer shown is designed to minimize the weight of the wear detection circuit while ensuring wear detection performance. Optionally, the intralayer structural features of the first and second conductor layers are consistent, such as including grid conductor layers with the same grid size, to ensure consistency in capacitance change characteristics between the two layers and the ground terminal, further simplifying the compensation process and improving the compensation effect.

[0047] In one example, the arrangement of the first conductor layer 220, the second conductor layer 230, and the third conductor layer 240 within a wearable device can be referenced. Figure 4a As shown, when the wearable device is worn by a user, the layers arranged from the user side to the outside of the wearable device (such as the side where the earphone shell is located) include: a first conductor layer 220, a second conductor layer 230, and a third conductor layer 240. The dimensions of the first conductor layer 220, the second conductor layer 230, and the third conductor layer 240 can be set according to the performance requirements of the corresponding wear detection circuit. For example, if the three layers have the same shape, their dimensions can be the same and they can be aligned with each other. The size of the three layers can be set according to the size of the corresponding wearable device and / or related wear detection performance factors, such as relatively small dimensions like 1 cm in length and 1.5 cm in width, to reduce the space occupied by the wear detection circuit while ensuring wear detection performance.

[0048] Optionally, refer to Figure 4b As shown, the edge of the second conductor layer extends beyond the edge of the first conductor layer to shield the first conductor layer from various interferences from the outside of the wearable device, such as the user's hand.

[0049] Optionally, such as Figure 4b As shown, the edge of the first conductor layer extends beyond the edge of the third conductor layer to shield the interference caused by the user side to the third conductor layer. This ensures that the capacitance between the third conductor layer and the ground is only affected by environmental factors such as temperature, which can further improve the compensation effect of the second signal that characterizes the capacitance between the third conductor layer and the ground, thereby improving the corresponding wear detection effect.

[0050] In one embodiment, reference Figure 5a and Figure 5bAs shown, the first conductor layer 320, the second conductor layer 330, and the third conductor layer 340 are stacked sequentially and insulated from each other. This reduces the size of the wear detection circuit and its space occupation in wearable devices such as headphones. The mutual isolation of each conductor layer ensures independent operation without interference, further improving stability during operation. In one example, the first conductor layer 320, the second conductor layer 330, and the third conductor layer 340 are each covered with an insulating layer to insulate adjacent conductor layers from each other. In another example, an insulating film can also be provided between adjacent conductor layers to achieve mutual insulation among the three layers. Figure 5a The first conductor layer 320, the second conductor layer 330, and the third conductor layer 340 shown are the same size, and their edges are aligned. Figure 5b In the first conductor layer 310, the size of the second conductor layer 330 is slightly larger than that of the first conductor layer 310, such that the edge of the second conductor layer 330 extends beyond the edge of the first conductor layer 310. The size of the first conductor layer 310 is slightly larger than that of the third conductor layer 340, such that the edge of the first conductor layer 310 extends slightly beyond the edge of the third conductor layer 340.

[0051] In one embodiment, the first conductor layer, the second conductor layer, and the third conductor layer are all flexible layers, which can minimize the impact on the user's wearing experience while ensuring the detection effect and improve the user's comfort when wearing the corresponding wearable device.

[0052] Specifically, the first conductor layer, the second conductor layer, and the third conductor layer can form an FPC, giving the corresponding wear detection circuit the advantages of high wiring density, small size, light weight, thinness, and good flexibility. This can improve the reliability of the corresponding detection process, avoid increasing the weight of the wearable device, avoid occupying the internal space of the wearable device, and ensure the comfort of the user when wearing the wearable device.

[0053] In one embodiment, the control unit is further configured to acquire the difference between the first signal and the second signal. If the difference is greater than or equal to a preset detection threshold, the wearable device is determined to be currently in a wearing state; if the difference is less than the detection threshold, the wearable device is determined to be currently in a non-wearing state. The detection threshold can be determined based on characteristics such as the material, size, and / or internal structure of the first and third conductor layers. The determination rule provided in this embodiment is simpler and can improve the corresponding detection efficiency while ensuring the accuracy of wear detection.

[0054] In one embodiment, the second conductor layer covers the inner side of the housing of the wearable device, such as the inner side of the earphone housing, to provide shielding for the various components within the second conductor layer (such as the first conductor layer and / or the third conductor, etc.), ensuring the stability of these components during operation, thereby improving the working stability of the corresponding wear detection circuit.

[0055] In one example, using a wearable device like headphones, the working process of the control unit is explained. The working process of the control unit described above can be found by referring to... Figure 6 As shown, the process includes the following:

[0056] S511, configure the second and third pins as shielding pins respectively, configure the first pin as a detection pin, so that the first conductor layer detects the capacitance to ground, and the third and second conductor layers serve as shielding layers to obtain the first signal;

[0057] S512 configures the first and second pins as shielding pins and the third pin as a detection pin, so that the third conductor layer detects the capacitance to ground, and the first and second conductor layers act as shielding layers to obtain the second signal;

[0058] S513, calculate the difference between the first signal and the second signal;

[0059] S514, determine whether the difference is greater than or equal to the detection threshold. If yes, proceed to step S515. If no, return to step S511 to continue configuring the relevant pins and reading the required signals (such as the first signal, etc.).

[0060] S515 determines that the headphones are currently being worn.

[0061] The above-described wear detection circuit features a first conductor layer and a second conductor layer sequentially arranged from the user side towards the wearable device's housing. The second conductor layer shields the first conductor layer from interference caused by the user's hand, other people's hands, other people's heads, and / or other conductive objects approaching the outside of the wearable device. This improves the stability of the first conductor layer during the detection process and enhances the stability of the first signal acquired by the control unit, thereby improving the overall anti-interference capability and reliability of the wear detection process. A third conductor layer is placed between the first and second conductor layers, allowing the control unit to acquire a second signal. Using this second signal to compensate for the first signal eliminates or weakens interference from environmental factors such as temperature, further improving the accuracy of the wear status detected by the control unit. By rationally configuring the functions of each pin in the control unit, the required first and second signals can be obtained without adding additional components. This results in a simple circuit structure that improves the accuracy of the wear detection process and reduces the overall cost of the wear detection circuit.

[0062] This application provides a control circuit for a wearable device in a second aspect, used to control the wearing device to be turned on and / or off. The control circuit includes a wear detection circuit and a control chip as described in any of the above embodiments; the control chip is used to acquire the wear state detected by the wear detection circuit for the wearable device, and to control the wearable device according to the wear state.

[0063] The control chip and control unit can be independent control units to ensure the independence of their respective control processes, or they can be the same control unit. For example, when the control chip of a wearable device has the function of integrating other control units, the control unit of the wear detection circuit can be integrated into the control chip of the wearable device to simplify the internal circuit structure of the wearable device and minimize the space occupied by each control unit.

[0064] Optionally, the control chip is also used to turn on the wearable device when it is being worn, and to turn off the wearable device when it is not being worn, so as to achieve automatic control of the wearable device and improve the user experience.

[0065] The control circuit of the wearable device described above includes the wear detection circuit provided in any of the above embodiments, which can reduce the occurrence of false shutdowns due to misidentification of the wear state, and the corresponding control process is more stable and reliable.

[0066] This application provides a wearable device in a third aspect, such as headphones, smart bracelets, smart rings, smart massagers, and / or smart glasses (such as AR glasses), etc. The aforementioned wearable device may include the wear detection circuit or the control circuit of the wearable device described in any of the above embodiments, offering strong anti-interference capabilities, more stable control processes, and improved user experience.

[0067] In one embodiment, the wearable device detection includes headphones. (Reference) Figure 7 As shown, the aforementioned headphones also include a headphone housing 611, an ear-mounted body 612, and a playback component (not shown in the figure). The headphone housing 611 and the ear-mounted body 612 are nested together to form an internal space, and the playback component and the headphone control circuit are located in the internal space. The control circuit of the wearable device can also be called the headphone control circuit. The headphone control circuit can be connected to the playback component. The headphone control circuit may include a communication module such as Bluetooth. This communication module receives audio data sent by playback devices such as mobile phones and / or computers, and controls the playback component to play the received audio data, so that the headphones respond to the playback needs of the playback device. Optionally, the playback component may include a speaker or other components for playing audio.

[0068] Optionally, such as Figure 7 As shown, the aforementioned earphone housing 611, ear-mount 612, and playback components and earphone control circuits disposed in the internal space formed by the two can form the earphone body 610. An earphone can typically include two earphone bodies so that when the user wears the earphone, the earphone body 610 is attached to both the user's left and right ears.

[0069] Optionally, refer to Figure 8 As shown, the headphones also include a headband 620, the two ends of which are connected to the headphone housing or the ear-mounted body, respectively. That is, the two ends of the headband 620 are connected to a headphone body 610 for the user to wear the headphones. When the user wears the headphones, the ear-mounted body is attached to the user's ear, allowing the user to clearly hear the audio data played by the headphones without disturbing other users.

[0070] Although this application has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art based on a reading and understanding of this specification and drawings. This application includes all such modifications and variations and is limited only by the scope of the appended claims. In particular, with respect to the various functions performed by the aforementioned components, the terminology used to describe such components is intended to correspond to any component (unless otherwise indicated) that performs the specified function of said component (e.g., is functionally equivalent to it), even if structurally not equivalent to the disclosed structure performing the functions in the exemplary implementations of this specification shown herein.

[0071] That is, the above description is only an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, such as the combination of technical features between different embodiments, or direct or indirect application in other related technical fields, are similarly included within the patent protection scope of this application.

[0072] Furthermore, for structural elements with the same or similar characteristics, this application may use the same or different reference numerals for identification. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0073] The above description has been provided to enable any person skilled in the art to implement and use this application. Various details have been set forth in the above description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be implemented without using these specific details. In other embodiments, well-known structures and processes will not be described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed herein.

Claims

1. A wear detection circuit for detecting the wearing status of a wearable device, characterized in that, The wear detection circuit includes a control unit, and a first conductor layer and a second conductor layer disposed inside the wearable device and arranged sequentially from the user side toward the housing of the wearable device. The control unit is connected to the first conductor layer and the second conductor layer respectively. The second conductor layer is used to provide shielding for the first conductor layer; The control unit is used to acquire a first signal characterizing the capacitance between the first conductor layer and the ground terminal, and to identify the wearing status of the wearable device based on the first signal. The wear detection circuit further includes a third conductor layer disposed between the first conductor layer and the second conductor layer, the third conductor layer being connected to the control unit; the third conductor layer is used to generate a second signal to compensate for the first signal; the control unit is also used to acquire the second signal, use the second signal to compensate for the first signal, and identify the wear status of the wearable device based on the compensated signal, the second signal being used to eliminate or weaken the interference of environmental factors on the first signal.

2. The wear detection circuit according to claim 1, characterized in that, The control unit includes a first pin connected to the first conductor layer, a second pin connected to the second conductor layer, and a third pin connected to the third conductor layer; The control unit is also configured to configure the functions of the first pin, the second pin, and the third pin respectively, so as to obtain the first signal through the first pin and the second signal through the third pin.

3. The wear detection circuit according to claim 2, characterized in that, The control unit is further configured to configure the second pin and the third pin as shielded pins, configure the first pin as a detection pin to obtain the first signal through the first pin, configure the first pin and the second pin as shielded pins, and configure the third pin as a detection pin to obtain the second signal through the third pin.

4. The wear detection circuit according to claim 1, characterized in that, The first conductor layer, the second conductor layer, and the third conductor layer have the same shape and / or material.

5. The wearing detection circuit according to claim 4, characterized in that, The edge of the second conductor layer extends beyond the edge of the first conductor layer; and / or, the edge of the first conductor layer extends beyond the edge of the third conductor layer.

6. The wear detection circuit according to claim 1, characterized in that, The first conductor layer, the second conductor layer, and the third conductor layer are stacked sequentially and are insulated from each other.

7. The wear detection circuit according to claim 1, characterized in that, The first conductor layer, the second conductor layer, and the third conductor layer are all flexible layers.

8. The wear detection circuit according to claim 1, characterized in that, The control unit is further configured to obtain the difference between the first signal and the second signal. If the difference is greater than or equal to a preset detection threshold, it is determined that the wearable device is currently in a wearing state. If the difference is less than the detection threshold, it is determined that the wearable device is currently in a non-wearing state.

9. The wear detection circuit according to claim 1, characterized in that, The second conductor layer covers the inside of the housing of the wearable device.

10. A control circuit for a wearable device, characterized in that, The device includes a wear detection circuit and a control chip as described in any one of claims 1 to 9; the control chip is used to acquire the wear status detected by the wear detection circuit for the wearable device, and to control the wearable device according to the wear status.

11. The control circuit for the wearable device according to claim 10, characterized in that, The control chip is also used to turn on the wearable device when it is being worn, and to turn off the wearable device when it is not being worn.

12. A wearable device, characterized in that, Includes the wear detection circuit according to any one of claims 1 to 9 or the control circuit of the wearable device according to claim 10 or 11.

13. The wearable device according to claim 12, characterized in that, The wearable device detection includes an earphone; the earphone also includes an earphone shell, an ear-mounted body, and a playback component; the earphone shell and the ear-mounted body are nested together to form an internal space, and the playback component and the control circuit are located in the internal space.

14. The wearable device according to claim 13, characterized in that, The headphones also include a headband, with both ends of the headband connected to the headphone housing or to the ear-mounted parts, so that the user can wear the headphones and the ear-mounted parts fit against the user's ears when the user wears the headphones.

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