WO2021179975A1

WO2021179975A1 - Coupled planar coil, displacement sensor and wearable electronic product

Info

Publication number: WO2021179975A1
Application number: PCT/CN2021/078963
Authority: WO
Inventors: 叶涛; 刘宇龙; 王淼; 夏丙一
Original assignee: 南方科技大学
Priority date: 2020-03-09
Filing date: 2021-03-03
Publication date: 2021-09-16
Also published as: CN111312491A; CN111312491B

Abstract

Provided are a coupled planar coil, a displacement sensor and a wearable electronic product, which relate to the technical field of induction coils. The coupled planar coil comprises a first fabric substrate, a second fabric substrate, a first inductance coil and a second inductance coil, wherein each of the first inductance coil and the second inductance coil comprises a plurality of turns of surrounding conductive fibers; the first inductance coil is arranged on the first fabric substrate; the second inductance coil is arranged on the second fabric substrate; and the first inductance coil and the second inductance coil are arranged in a stacked mode. The first inductance coil and the second inductance coil are both made of the conductive fibers and are arranged on different fabric substrates, respectively. This structure can not only realize the function of coupling planar coils, but can also reduce the size of the coupled planar coil and increase the flexibility of the coupled planar coil, and is more suitable for wearable electronic products.

Description

Coupling planar coils, displacement sensors and wearable electronic products

Cross-references to related applications

This application claims the priority of the Chinese patent application with the application number 2020101570953 and the name "Coupled Planar Coil, Displacement Sensor and Wearable Electronic Product" submitted to the Chinese Patent Office on March 9, 2020, the entire content of which is incorporated by reference In this application.

Technical field

This application relates to the technical field of induction coils, and in particular to a coupled planar coil, a displacement sensor and a wearable electronic product.

Background technique

When two inductance coils are coupled in series with each other, the magnetic flux generated by one inductance coil will induce current in the other inductance coil due to the phenomenon of mutual inductance. The change of the mutual inductance doubles the change of the equivalent inductance of the two coupled inductors, and any factor that causes the change of the mutual inductance can be amplified.

The existing inductor coil can be formed on a printed circuit board (Printed Circuit Board, PCB) or printed circuit board; or formed on a flexible printed circuit board. Although the use of flexible printed circuit boards has improved the shortcomings of traditional PCBs that are hard, heavy and not easily deformed, its complex manufacturing process leads to increased production costs and damage to the working environment. At the same time, its limited flexibility causes the copper foil to break after excessive deformation, so This type of inductive coil is not suitable for many applications of smart textiles.

Summary of the invention

In view of this, the purpose of this application is to provide a coupled planar coil, a displacement sensor and a wearable electronic product to solve the above-mentioned problems.

In order to achieve the foregoing objectives, the technical solutions adopted in the implementation of this application are as follows:

The embodiment of the present application provides a coupled planar coil. The coupled planar coil includes a first fabric substrate, a second fabric substrate, a first inductor coil, and a second inductor coil. The first inductor coil and the second inductor Each of the coils includes a conductive fiber surrounded by multiple turns, the first inductance coil is disposed on the first fabric substrate, the second inductance coil is disposed on the second inductance coil, the first inductance coil and the first inductance coil are disposed on the Two inductance coils are stacked.

Optionally, the conductive fibers of the first inductor coil may be sewn on the first fabric substrate, and the conductive fibers of the second inductor coil may be sewn on the second fabric substrate.

Optionally, the first inductor coil may further include a first substrate, the second inductor coil may further include a second substrate, the conductive fibers of the first inductor coil are sewn on the first substrate, and the second inductor A base is disposed on the first fabric substrate, the conductive fibers of the second inductor coil are sewn on the second base, and the second base is disposed on the second fabric substrate.

Optionally, the coupled planar coil may further include an elastic spacer, the elastic spacer is disposed between the first fabric substrate and the second fabric substrate, and one end of the elastic spacer is connected to the first fabric substrate. A fabric substrate is connected, and the other end of the elastic spacer is connected with the second fabric substrate.

Optionally, the first inductance coil may be connected in series with the second inductance coil.

Optionally, multiple turns of the conductive fibers may be arranged at equal intervals.

Optionally, the coupled planar coil may further include a third fabric substrate and a third inductive coil, the third inductive coil includes a conductive fiber surrounded by multiple turns, and the third inductive coil is disposed on the third fabric substrate The third inductance coil and the first inductance coil are stacked, and the third fabric substrate is located on a side of the first inductance coil away from the second inductance coil.

The embodiment of the present application also provides a displacement sensor, the displacement sensor including a controller and any one of the aforementioned coupling planar coils, and the controller is electrically connected to the coupling planar coil;

The coupled planar coil is configured to output a first voltage to the controller when the first inductance coil and the second inductance coil are in a first state;

The coupling planar coil is configured to output a second voltage to the controller when the first inductance coil and the second inductance coil are in a second state;

The controller is configured to calculate a displacement value based on the first voltage and the second voltage.

Optionally, the first voltage may be related to the number of turns of the first inductance coil, the coil parameters of the first inductance coil, the number of turns of the second inductance coil, and the number of turns of the second inductance coil. Coil parameter association.

The embodiment of the present application also provides a wearable electronic product, and the wearable electronic product includes any one of the above-mentioned displacement sensors.

The coupled planar coil provided by the embodiment of the present application includes a first fabric substrate, a second fabric substrate, a first inductor coil, and a second inductor coil. Both the first inductor coil and the second inductor coil include conductive fibers surrounded by multiple turns. An inductance coil is disposed on the first fabric substrate, the second inductance coil is disposed on the second inductance coil, and the first inductance coil and the second inductance coil are stacked. Since the first inductance coil and the second inductance coil are made of conductive fibers and are respectively arranged on different fabric substrates, this structure can not only realize the function of coupling the planar coil, but also reduce the volume and increase the volume of the coupled planar coil. The flexibility of the coupled planar coil is more suitable for wearable electronic products.

In order to make the above-mentioned objectives, features and advantages of the present application more obvious and understandable, the preferred embodiments, together with the accompanying drawings, are described in detail below.

Description of the drawings

In order to more clearly describe the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application, and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative work.

Fig. 1 shows a schematic structural diagram of a coupled planar coil provided by an embodiment of the present application.

Fig. 2 shows a schematic diagram of an inductor coil provided by an embodiment of the present application.

Fig. 3 shows a schematic diagram of an optional inductance coil provided by an embodiment of the present application.

Figure 4 shows a schematic diagram of the relationship between equivalent inductance and displacement of a circular coupled planar coil.

Figure 5 shows a schematic diagram of the relationship between equivalent inductance and displacement of a square coupled planar coil.

Fig. 6 shows a schematic structural diagram of an optional coupled planar coil provided by an embodiment of the present application.

Fig. 7 shows a schematic structural diagram of an optional coupled planar coil provided by an embodiment of the present application.

FIG. 8 shows a schematic structural diagram of a displacement sensor provided by an embodiment of the present application.

FIG. 9 shows a schematic structural diagram of an optional displacement sensor provided by an embodiment of the present application.

FIG. 10 shows a schematic structural diagram of a wearable electronic product provided by an embodiment of the present application.

FIG. 11 shows a schematic structural diagram of an optional wearable electronic product provided by an embodiment of the present application.

Icon: 100-coupled planar coil; 110-first fabric substrate; 120-second fabric substrate; 130-first inductive coil; 140-second inductive coil; 150-elastic spacer; 160-first substrate; 170- The second base; 180-the third fabric substrate; 190-the third inductance coil; 200-displacement sensor; 210-controller; 300-wearable electronic product.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of them. The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in various different configurations.

Therefore, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the implementation of this application, all other implementations obtained by those skilled in the art without creative work shall fall within the protection scope of this application.

In the description of this application, it should also be noted that the terms "set", "installation", "connected" and "connected" should be understood in a broad sense, unless otherwise clearly specified and limited. For example, they may be fixed connections. It can also be detachably connected or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood under specific circumstances.

It should be noted that similar reference numerals and letters indicate similar items in the following figures. Therefore, once a certain item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

In the description of this application, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", and "outer" are based on the drawings shown The orientation or position relationship, or the orientation or position relationship that the product of the invention is usually placed in use, is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation and The specific azimuth structure and operation cannot be understood as a limitation of this application. The above are only the preferred embodiments of the application, and do not limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

In addition, the terms "horizontal", "vertical", "overhanging" and other terms do not mean that the component is required to be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined.

It should be noted that similar reference numerals and letters indicate similar items in the following figures. Therefore, once a certain item is defined in one figure, it does not need to be further defined and explained in subsequent figures. At the same time, in the description of this application, the terms "first", "second", etc. only distinguish the description, and cannot be understood as indicating or implying relative importance.

The present application provides a coupled planar coil 100, which is softer and lighter than the existing coupled planar coil 100. Please refer to FIG. 1, which is a schematic diagram of the structure of the coupled planar coil 100 provided in this application. The coupled planar coil 100 includes a first fabric substrate 110, a second fabric substrate 120, a first inductance coil 130 and a second inductance coil 140. Both the first inductance coil 130 and the second inductance coil 140 include conductive fibers surrounded by multiple turns, The first inductor coil 130 is disposed on the first fabric substrate 110, the second inductor coil 140 is disposed on the second fabric substrate 120, and the first inductor coil 130 and the second inductor coil 140 are stacked.

Wherein, the first fabric substrate 110 is configured to provide a first inductor coil 130, and the second fabric substrate 120 is configured to provide a second inductor coil 140. It should be noted that both the first fabric substrate 110 and the second fabric substrate 120 are non-conductive fabrics, such as non-woven fabrics, knitted fabrics, woven fabrics, woven cotton linen fabrics, and the like.

In an alternative embodiment, both the first fabric substrate 110 and the second fabric substrate 120 are made of stretchable fabric. By using stretchable fabrics to make the first fabric substrate 110 and the second fabric substrate 120, it is advantageous for the first fabric substrate 110 and the second fabric substrate 120 to be deformed under external force to change the first inductance coil 130 and the second fabric substrate 120. The relative displacement of the second inductance coil 140 changes the inductance value of the coupled planar coil 100.

The first inductor coil 130 is disposed on the first fabric substrate 110, the second inductor coil 140 is disposed on the second fabric substrate 120, and the first inductor coil 130 and the second inductor coil 140 are stacked. It should be noted that the stacking arrangement of the first inductance coil 130 and the second inductance coil 140 can be understood as: the first inductance coil 130 and the second inductance coil 140 overlap in the vertical direction.

Wherein, the first inductance coil 130 and the second inductance coil 140 both include conductive fibers surrounded by multiple turns. For example, the conductive fiber may be a twisted stainless steel wire bundle with a diameter of about 0.48 mm and a resistivity of about 9.3 ohm/m.

In an alternative embodiment, the conductive fibers of the first inductor coil 130 are sewn on the first fabric substrate 110, and the conductive fibers of the second inductor coil 140 are sewn on the second fabric substrate 120. For example, the user can use the Brother commercial embroidery machine PR670E to embroider the inductor coils on the first fabric substrate 110 and the second fabric substrate 120 at a stitch speed of 400 rpm to generate the first inductance coil 130 and the second inductance coil 140, the smallest stitch The length is 1mm.

FIG. 3 shows a schematic diagram of an optional inductor coil provided by an embodiment of the present application. Referring to FIG. 3, the first inductor coil 130 further includes a first substrate 160, and the second inductor coil 140 further includes a second substrate 170. The conductive fibers of the coil 130 are sewn on the first base 160, the first base 160 is set on the first fabric substrate 110, the conductive fibers of the second inductor coil 140 are sewed on the second base 170, and the second base 170 is set on the second fabric The substrate 120.

It can be understood that by providing the first base 160 and the second base 170, the first inductor coil 130 can be disposed on the first fabric substrate 110, and the second inductor coil 140 can be disposed on the second fabric substrate 120. Therefore, when the first inductance coil 130 or the second inductance coil 140 is damaged, the first inductance coil 130 or the second inductance coil 140 can be directly replaced without re-sewing the inductance coil on the fabric substrate, which is convenient for the user to replace.

It should be noted that, in an optional implementation manner, in order to enhance the sensitivity of the coupled planar coil 100, the first inductance coil 130 and the second inductance coil 140 are connected in series.

In addition, the present application does not need to impose any restrictions on the shapes of the first inductance coil 130 and the second inductance coil 140, which can be specifically set according to the specific needs of the user. In an alternative embodiment, the shape of the first inductance coil 130 and the second inductance coil 140 may be the same. For example, the first inductance coil 130 and the second inductance coil 140 are both concentric circular coils, concentric square coils, concentric star coils, or any other regular or irregular shapes. However, in another alternative embodiment, the shapes of the first inductance coil 130 and the second inductance coil 140 may also be different. For example, the first inductance coil 130 and the second inductance coil 140 can have any two different shapes, for example, the first inductance coil 130 is a concentric circular coil, and the second inductance coil 140 is a concentric square coil.

In addition, in an optional embodiment, the multi-turn conductive fibers of the first inductance coil 130 and the second inductance coil 140 are arranged at equal intervals. Of course, in other embodiments, the multi-turn conductive fibers may not be arranged at equal intervals. However, it should be noted that by arranging multiple turns of conductive fibers at equal intervals, the result obtained when using the inductive coil to measure the displacement value can be made more accurate.

It can be understood that the inductance of the coupled planar coil 100 is associated with the inductance of the first inductance coil 130 itself, the inductance of the second inductance coil 140 itself, and the mutual inductance formed between the first inductance coil 130 and the second inductance coil 140. Among them, the inductance of the inductor coil itself is related to the number of turns of the coil, the coil parameters, and the permeability of the free space. The mutual inductance formed between the first inductance coil 130 and the second inductance coil 140 is related to the position between the first inductance coil 130 and the second inductance coil 140.

Specifically, the coil parameters include the average radius of the coil and the distance between the inner and outer coils of the coil. In this embodiment, the first inductance coil 130 is a concentric and equally spaced circular coil, and the second inductance coil 140 is a concentric and equidistant square coil as an example, and the first inductance coil 130 and the first inductance coil 130 and the second inductance coil 130 are calculated in conjunction with FIG. The inductance of the two inductance coil 140:

Among them, L ₁ is the inductance of the first inductance coil 130, L ₂ is the inductance of the second inductance coil 140, μ ₀ is the permeability of free space (μ ₀ =4π×10 ^-7 Hm ^-1 ), and N ₁ is The number of turns of the first inductive coil 130, N ₂ is the number of turns of the second inductive coil 140, a ₁ is the average radius of the first inductive coil 130, a ₂ is the average radius of the second inductive coil 140, and c ₁ is the first The distance between the inner ring and the outer ring of the inductor coil 130, and c ₂ is the distance between the inner ring and the outer ring of the second inductor coil 140.

in,

dout ₁ is the outer diameter of the first inductance coil 130, dout ₂ is the outer diameter of the second inductance coil 140, din ₁ is the inner diameter of the first inductance coil 130, and din ₂ is the inner diameter of the second inductance coil 140.

In addition, when a lateral displacement occurs between the first inductance coil 130 and the second inductance coil 140, the mutual inductance between the first inductance coil 130 and the second inductance coil 140 will change, thereby changing the inductance of the coupled planar coil 100.

In this embodiment, the inventor takes the first inductance coil 130 and the second inductance coil 140 as circular coils, and takes the first inductance coil 130 and the second inductance coil 140 as square coils as examples to test the coupling plane. The relationship between the inductance of the coil 100 and the displacement between the first inductance coil 130 and the second inductance coil 140.

First, the test environment is set up: the first fabric substrate 110 is fixed, and the second fabric substrate 120 is moved on the grid paper, and each displacement step is spaced 5 mm apart. In addition, the first inductor coil 130 and the second inductor coil 140 are separated by a non-conductive fabric layer as insulation. At the same time, use the network analyzer to calibrate the adapter's terminals to eliminate the parasitic effects of the fixture, and set the measurement frequency to a total of 201 points from 1MHz to 50MHz.

During the test, connect the two terminals of the coupled planar coil 100 (the free ends of the first inductance coil 130 and the free end of the second inductance coil 140) to an adapter, and connect the adapter to the high-precision Keysight vector network analyzer E5071 , The displacement of the second fabric substrate 120 varies from -50mm to 50mm laterally, and the total equivalent inductance at the frequency point 13.56MHz is measured at an interval of 5mm along the y-axis as the inductance of the coupled planar coil 100. The test results obtained are as follows Shown in Figure 4 and Figure 5. Among them, FIG. 4 shows a schematic diagram of the relationship between the equivalent inductance of the coupled planar coil 100 of the circular coil and the displacement. FIG. 5 shows a schematic diagram of the relationship between the equivalent inductance of the coupled planar coil 100 of the square coil and the displacement.

In combination with FIG. 4 and FIG. 5, it can be seen that the relationship between the equivalent inductance change and displacement of the coupled planar coil 100 is very significant. When the displacement moves from the complete overlap between the two inductance coils (the first inductance coil 130 and the second inductance coil 140) to complete separation, the equivalent inductance of the coupled planar coil 100 changes from 6.25uH to 3.0uH for the circular coil , For the square coil from 6.1uH to 4.0uH. At the same time, the coupled plane coil 100 of the square coil has higher linearity than the coupled plane coil 100 of the circular coil. Therefore, in actual application, the user can measure the displacement between the first inductance coil 130 and the second inductance coil 140 according to the inductance of the coupled planar coil 100.

At the same time, in conjunction with Figures 4 and 5, it can be seen that if the first inductance coil 130 and the second inductance coil 140 are placed in the same direction (that is, the current direction of the first inductance coil 130 and the second inductance coil 140 are the same), the equivalent inductance varies with As the displacement increases, it decreases; if the first inductance coil 130 and the second inductance coil 140 are placed in opposite directions, the equivalent inductance increases as the displacement increases.

According to the above content, users can flexibly set the number of turns of the inductor coil and the size of the inductor coil according to their own requirements for inductance, thereby changing the sensitivity and measurement range of the coupled planar coil 100.

The embodiment of the present application also provides an optional coupled planar coil 100. It should be noted that the basic principle and technical effects of the coupled planar coil 100 provided in the embodiment of the present application are the same as those of the foregoing embodiment, which is a brief description. For the parts not mentioned in this embodiment, please refer to the corresponding content in the above embodiment.

In this embodiment, referring to FIG. 6, the coupled planar coil 100 further includes an elastic spacer 150. The elastic spacer 150 is disposed between the first fabric substrate 110 and the second fabric substrate 120. One end of the elastic spacer 150 is connected to the second fabric substrate. A fabric substrate 110 is connected, and the other end of the elastic spacer 150 is connected to the second fabric substrate 120.

It is understandable that when the coupled planar coil 100 receives a horizontal force, the elastic spacer 150 will be stretched to cause a displacement between the first inductance coil 130 and the second inductance coil 140, so that the first inductance coil 130 and the second inductance coil 140 The mutual inductance between the two inductor coils 140 further changes the equivalent inductance of the coupled planar coil 100.

The embodiment of the present application also provides an optional coupled planar coil 100. It should be noted that the basic principle and technical effects of the coupled planar coil 100 provided by the embodiment of the present application are the same as those of the foregoing embodiment, which is a brief description. For the parts not mentioned in this embodiment, please refer to the corresponding content in the above embodiment.

FIG. 7 shows a schematic structural diagram of an optional coupled planar coil 100 provided by an embodiment of the present application. In this embodiment, the coupled planar coil 100 further includes a third fabric substrate 180 and a third inductive coil 190. The third inductive coil 190 includes a conductive fiber surrounded by multiple turns. The third inductive coil 190 is disposed on the third fabric substrate 180. The third inductance coil 190 is stacked on the first inductance coil 130, and the third fabric substrate 180 is located on a side of the first inductance coil 130 away from the second inductance coil 140.

It should be noted that the more inductance coils included in the coupled plane coil 100, the smaller the area of each inductance coil and the smaller the area of the coupled plane coil 100 while the equivalent inductance of the coupled plane coil 100 remains unchanged. In addition, the greater the number of inductance coils, the more the measurement range and sensitivity of the coupled planar coil 100 will increase.

It should also be noted that since the greater the number of inductance coils, the thicker the thickness of the coupled planar coil 100, so the actual application requirements should also be considered when setting the number of inductance coils.

The embodiment of the present application provides a displacement sensor 200, and FIG. 8 shows a schematic structural diagram of the displacement sensor provided in the embodiment of the present application. For description with reference to FIG. 8, the displacement sensor 200 includes a controller 210 and the coupled planar coil 100 provided by any one of the above embodiments, and the controller 210 is electrically connected to the coupled planar coil 100.

The coupling plane coil 100 is configured to output a first voltage to the controller when the first inductance coil 130 and the second inductance coil 140 are in the first state; the coupling plane coil 100 is configured to be when the first inductance coil 130 and the second inductance coil 140 are in the In the second state, the second voltage is output to the controller.

In an alternative embodiment, the first state may be a state where the first inductance coil 130 and the second inductance coil 140 are completely overlapped; the second state may be before the first inductance coil 130 and the second inductance coil 140 The state of relative displacement.

The controller is configured to calculate the displacement value based on the first voltage and the second voltage.

Understandably, both the first voltage and the second voltage are related to the number of turns of the first inductance coil 130, the coil parameters of the first inductance coil 130, the number of turns of the second inductance coil 140, and the coil parameters of the second inductance coil 140. Associated.

It should be noted that the embodiment of the present application provides an optional displacement sensor 200, and FIG. 9 shows a schematic structural diagram of the optional displacement sensor provided in the embodiment of the present application. 9 for description, when the displacement sensor 200 further includes other inductance coils, such as the third inductance coil 190, the first voltage should be when the first inductance coil 130, the second inductance coil 140, and the third inductance coil 190 are in a coincident state. When coupled with the voltage value output by the planar coil 100. The second voltage is the voltage value output by the coupled planar coil 100 when there is a relative displacement between the first inductance coil 130, the second inductance coil 140, and the third inductance coil 190.

The embodiment of the present application also provides a wearable electronic product 300, and FIG. 10 and FIG. 11 show schematic structural diagrams of the wearable electronic product provided by the embodiment of the present application. 10 and 11, the wearable electronic product 300 includes the displacement sensor 200 described above. The wearable electronic product 300 can be, but is not limited to, sports vests, wrist guards, ankle guards and other equipment.

In summary, the coupled planar coil, displacement sensor, and wearable electronic product provided by the present application include a first fabric substrate, a second fabric substrate, a first inductor coil and a second inductor coil, and the first inductor coil and the second inductor The coils all include conductive fibers surrounded by multiple turns. The first inductance coil is disposed on the first fabric substrate, the second inductance coil is disposed on the second inductance coil, and the first inductance coil and the second inductance coil are stacked. Since the first inductance coil and the second inductance coil are made of conductive fibers and are respectively arranged on different fabric substrates, this structure can not only realize the function of coupling planar coils, but also reduce the volume and increase the volume of the coupled planar coils. The flexibility of the coupled planar coil is more suitable for wearable electronic products.

The above are only the preferred embodiments of the application, and do not limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Industrial applicability

This application can be applied to the technical field of induction coils, and applied to coupled planar coils, displacement sensors, and wearable electronic products.

Claims

A coupled planar coil, wherein the coupled planar coil includes a first fabric substrate, a second fabric substrate, a first inductance coil and a second inductance coil, both of the first inductance coil and the second inductance coil It includes a conductive fiber surrounded by multiple turns, the first inductance coil is disposed on the first fabric substrate, the second inductance coil is disposed on the second inductance coil, the first inductance coil and the second inductance The coils are stacked.
The coupled planar coil according to claim 1, wherein the conductive fiber of the first inductance coil is sewn on the first fabric substrate, and the conductive fiber of the second inductance coil is sewn on the second Fabric substrate.
The coupled planar coil according to claim 1, wherein the first inductive coil further comprises a first substrate, the second inductive coil further comprises a second substrate, and conductive fibers of the first inductive coil are sewn On the first base, the first base is set on the first fabric substrate, the conductive fibers of the second inductor coil are sewn on the second base, and the second base is set on the second Fabric substrate.
The coupled planar coil according to any one of claims 1-3, wherein the coupled planar coil further comprises an elastic spacer, and the elastic spacer is disposed on the first fabric substrate and the second fabric substrate. Between the fabric substrates, one end of the elastic spacer is connected with the first fabric substrate, and the other end of the elastic spacer is connected with the second fabric substrate.
The coupled planar coil according to any one of claims 1 to 3, wherein the first inductance coil and the second inductance coil are connected in series.
The coupled planar coil according to any one of claims 1 to 3, wherein multiple turns of the conductive fibers are arranged at equal intervals.
The coupled planar coil according to any one of claims 1 to 3, wherein the coupled planar coil further comprises a third fabric substrate and a third inductive coil, and the third inductive coil includes a conductive loop surrounded by multiple turns. Fiber, the third inductance coil is arranged on the third fabric substrate, the third inductance coil and the first inductance coil are stacked and arranged, and the third fabric substrate is located away from the first inductance coil. Two side of the inductor coil.
A displacement sensor, characterized in that the displacement sensor comprises a controller and the coupled planar coil according to any one of claims 1-6, and the controller is electrically connected to the coupled planar coil;

The coupled planar coil is configured to output a first voltage to the controller when the first inductance coil and the second inductance coil are in a first state;

The coupling planar coil is configured to output a second voltage to the controller when the first inductance coil and the second inductance coil are in a second state;

The controller is configured to calculate a displacement value based on the first voltage and the second voltage.
The displacement sensor according to claim 8, wherein the first voltage and the number of turns of the first inductive coil, the coil parameters of the first inductive coil, and the turns of the second inductive coil The number and the coil parameters of the second inductance coil are correlated.
A displacement sensor, wherein the displacement sensor comprises a controller and the coupled planar coil according to claim 7, and the controller is electrically connected to the coupled planar coil;

The coupled planar coil is configured to output a first voltage to the controller when the first inductance coil, the second inductance coil, and the third inductance coil are in a first state;

The coupling planar coil is configured to output a second voltage to the controller when the first inductance coil, the second inductance coil, and the third inductance coil are in a second state;

The controller is configured to calculate a displacement value based on the first voltage and the second voltage.
The displacement sensor according to claim 10, wherein the first voltage and the number of turns of the first inductive coil, the coil parameters of the first inductive coil, and the turns of the second inductive coil The number, the coil parameters of the second inductance coil, the number of turns of the third inductance coil, and the coil parameters of the third inductance coil are correlated.
A wearable electronic product, wherein the wearable electronic product comprises the displacement sensor according to any one of claims 8 to 11.