Capacitive position detection calibration structure and electronic device

Abstract

The application relates to the field of position detection, and discloses a capacitive position detection calibration structure and an electronic device. The capacitive position detection calibration structure comprises a box body, a detection capacitor unit arranged on the side wall of the box body, and a calibration capacitor unit arranged on the bottom of the box body; the box body comprises a bottom surface and a side wall; the detection capacitor unit is arranged to extend from the bottom surface of the box body to the highest storage position of the box body, and the detection capacitor unit is not lower than the highest storage position; in the case that the box body stores content, the stored content covers the calibration capacitor unit; the calibration capacitor unit is used for calculating the dielectric constant of the obtained content, and the detection capacitor unit is used for calculating the storage height of the content in the box body according to the dielectric constant. The dielectric constant of the content in the box body is detected by using the calibration capacitor unit, and then the storage height of the content is calibrated, the accuracy of position detection is improved, and the detection result is not affected by environmental factors (such as temperature) or content materials.

Description

Technical Field

[0001] This application relates to the field of position detection, and in particular to a capacitive position detection calibration structure and electronic device. Background Technology

[0002] When storing contents inside a container, especially when the outer wall of the container is opaque, a detection unit needs to be installed inside the container to determine the storage height of the contents. Currently available options include installing a capacitive detection unit inside the container, using changes in capacitance to determine the storage height of the contents.

[0003] However, the state of the contents is not constant. The dielectric constant changes due to factors such as ambient temperature and the material of the contents. This causes deviations in the storage height detected by the capacitive detection unit, affecting the detection accuracy. Utility Model Content

[0004] The purpose of this application is to provide a capacitive position detection calibration structure and electronic device. A calibration capacitor unit is set at the bottom of the box, and the dielectric constant of the contents of the box is detected by the calibration capacitor unit, thereby realizing the calibration of the storage height of the contents, improving the accuracy of position detection, and making the detection results unaffected by environmental factors (such as temperature) or the material of the contents.

[0005] To address the aforementioned technical problems, embodiments of this application provide a capacitive position detection and calibration structure, comprising: a housing, a detection capacitor unit disposed on the side wall of the housing, and a calibration capacitor unit disposed at the bottom of the housing; the housing includes a bottom surface and side walls; the detection capacitor unit extends from the bottom of the housing towards the highest storage position of the housing, and the detection capacitor unit is not lower than the highest storage position; when the housing stores contents, the stored contents cover the calibration capacitor unit; the calibration capacitor unit is used to calculate the dielectric constant of the contents, and the detection capacitor unit is used to calculate the storage height of the contents within the housing based on the dielectric constant.

[0006] Embodiments of this application also provide an electronic device including the capacitive position detection and calibration structure described above.

[0007] Compared to related technologies, this embodiment of the application provides a detection capacitor unit on the side wall of the enclosure and a calibration capacitor unit on the bottom of the enclosure. The detection capacitor unit extends from the bottom of the enclosure towards the highest storage position, and is not lower than the highest storage position. When the enclosure is filled with contents, the contents cover the calibration capacitor unit. The calibration capacitor unit is used to calculate the dielectric constant of the contents, and the detection capacitor unit is used to calculate the storage height of the contents within the enclosure based on the dielectric constant. By using the calibration capacitor unit to detect the dielectric constant of the contents, the storage height of the contents is calibrated, improving the accuracy of position detection and ensuring that the detection results are not affected by environmental factors (such as temperature) or the material of the contents.

[0008] In addition, the calibration capacitor unit includes: a calibration emitter plate and a calibration receiver plate; both the calibration emitter plate and the calibration receiver plate are disposed on the bottom surface of the housing; or, both the calibration emitter plate and the calibration receiver plate are disposed on the side wall near the bottom surface.

[0009] In addition, there are multiple detection capacitor units, and each detection capacitor unit outputs a corresponding detection result. The storage height is determined based on the average value of the multiple detection results.

[0010] In addition, each detection capacitor unit includes a detection emitting plate and a detection receiving plate; the detection emitting plate and the detection receiving plate are arranged alternately.

[0011] In addition, the distance between the detection emitting electrode and the detection receiving electrodes on both sides is the same.

[0012] In addition, the detection capacitor unit includes: a detection emitting plate and a detection receiving plate; the number of detection receiving plates is two, and the two detection receiving plates are respectively disposed on both sides of the detection emitting plate.

[0013] In addition, the shape of the detection emitting plate is a parallelogram, and the detection receiving plates on both sides of the detection emitting plate have the same shape, which is trapezoidal or triangular.

[0014] In addition, the detection capacitor unit includes: a detection emitting plate and a detection receiving plate; the number of detection receiving plates is multiple, and the multiple detection receiving plates are arranged sequentially along a direction perpendicular to the bottom surface; the capacitance value of the detection emitting plate and at least one detection receiving plate determines the storage height.

[0015] In addition, all the detection receiving plates are rectangular, trapezoidal or triangular; two adjacent detection receiving plates form a centrally symmetrical figure. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0017] Figure 1 This is based on the correspondence table between ambient temperature and the relative permittivity of the contents in this embodiment of the scheme; Figure 2 This is a three-dimensional structural diagram of the capacitive position detection and calibration structure according to the first embodiment of this solution; Figure 3 This is a schematic diagram of the electric field distribution of the calibration capacitor unit in the case where there are no contents inside the box in the capacitive position detection calibration structure according to the first embodiment of this solution; Figure 4 This is a schematic diagram of the electric field distribution of the calibration capacitor unit in the case where there are a small amount of contents inside the box in the capacitive position detection calibration structure according to the first embodiment of this solution. Figure 5 This is a schematic diagram of the electric field distribution of the calibration capacitor unit in the case where there are a large number of contents inside the box in the capacitive position detection calibration structure according to the first embodiment of this solution; Figure 6 This is a diagram showing the relationship between the capacitance value of the calibration capacitor unit and the dielectric constant of the liquid in the capacitive position detection calibration structure according to the first embodiment of this solution; Figure 7 This is a schematic diagram of the detection capacitor unit in the capacitive position detection and calibration structure according to the first embodiment of this solution; Figure 8 This is a diagram showing the relationship between the capacitance of the detection capacitor unit under different dielectric constants and the water level height in the capacitive position detection calibration structure according to the first embodiment of this scheme; Figure 9 This is a schematic diagram of the calibration capacitor unit in the capacitive position detection and calibration structure according to the first embodiment of this solution; Figure 10 This is a schematic diagram of the detection capacitor unit in the capacitive position detection and calibration structure according to the second embodiment of this solution; Figure 11 This is a schematic diagram of the detection capacitor unit in the capacitive position detection and calibration structure according to the third embodiment of this solution; Figure 12 This is a three-dimensional structural diagram of the capacitive position detection and calibration structure according to the third embodiment of this solution; Figure 13 This is a schematic diagram of the detection capacitor unit in the capacitive position detection and calibration structure according to the fourth embodiment of this solution; Figure 14 This is a schematic diagram of another structure of the detection capacitor unit in the capacitive position detection calibration structure according to the fourth embodiment of this solution; Figure 15 This is a schematic diagram of the detection capacitor unit in the capacitive position detection and calibration structure according to the fifth embodiment of this solution; Figure 16 This is a schematic diagram of another structure of the detection capacitor unit in the capacitive position detection calibration structure according to the fifth embodiment of this solution.

[0018] Figure label: 1-Box body; 11-Bottom surface; 12-Side wall; 2-Detection capacitor unit; 21-Detection transmitting electrode; 22-Detection receiving electrode; 3-Calibrate capacitor unit; 31-Calibrate emitter plate; 32-Calibrate receiver plate; 4-Contents; 5-Grounding component. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of this application to enable readers to better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0020] The division of the following embodiments is for ease of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.

[0021] The dielectric constant of the contents of the same material will change under different temperatures, such as Figure 1 As shown, the relative permittivity of water varies at different temperatures. At low temperatures (e.g., 0°C), the thermal motion of water molecules is weak, the hydrogen bond network is stable, and a large number of dipoles are arranged in an orderly manner along the direction of the external electric field, resulting in strong polarization and a high permittivity. As the temperature increases, the intensified thermal motion disrupts the stability of the hydrogen bonds, leading to a decrease in the orderliness of the dipole arrangement; furthermore, the intermolecular distance increases, weakening the interaction between dipoles and reducing polarization efficiency; additionally, at high temperatures, some hydrogen bonds break, increasing the proportion of free water molecules and weakening the overall polarization ability, thus lowering the permittivity.

[0022] In addition to temperature affecting the dielectric constant of the contents, the dielectric constant of liquids stored in the cabinet also varies when different materials are used for cooling. For example, the contents stored in the cabinet used for cooling electronic devices are coolant, while the contents stored in the cabinet used for coffee machines are coffee liquid, and so on. The contents of the cabinet are different in different application scenarios, and the dielectric constant of the contents is also different.

[0023] The first embodiment of this application relates to a capacitive position detection and calibration structure, used to correct the storage height of the contents when the dielectric constant of the contents inside the aforementioned box changes. Figure 2 As shown, the capacitive position detection and calibration structure includes: a housing 1, a detection capacitor unit 2 disposed on the side wall of the housing, and a calibration capacitor unit 3 disposed on the bottom of the housing; the housing 1 includes a bottom surface 11 and a side wall 12; the detection capacitor unit 2 extends from the bottom surface 11 of the housing to the highest storage position of the housing, and the detection capacitor unit 2 is not lower than the highest storage position; when the housing 1 is storing contents, the stored contents cover the calibration capacitor unit 3; the calibration capacitor unit 3 is used to calculate the dielectric constant of the contents, and the detection capacitor unit 2 is used to calculate the storage height of the contents in the housing 1 based on the dielectric constant.

[0024] The detection principle of the calibration capacitor unit is explained below: The calibration capacitor unit includes a calibration emitter plate 31 and a calibration receiver plate 32. To standardize the electric field line distribution of the calibration emitter plate 31 and the calibration receiver plate 32, a grounding element can be covered on the side of the calibration emitter plate 31 and the calibration receiver plate 32 away from the enclosure, so that the electric field lines of the calibration emitter plate 31 and the calibration receiver plate 32 are distributed on the side facing the enclosure. For example... Figure 3 As shown, when the chamber is empty, the calibration emitter plate 31 and the calibration receiver plate 32 are coupled to the air through the chamber. Since the chamber is generally made of non-metallic materials such as acrylic, and the relative permittivity of acrylic and other plastic materials is generally 3 to 4, the electric field lines of the calibration emitter plate 31 and the calibration receiver plate 32 are relatively few, and the capacitance of the calibration capacitor unit is relatively small. Figure 4 As shown, when there is a small amount of contents 4 inside the box, the dielectric constant of contents 4 is greater than that of the box material and air. Therefore, the electric field lines of the calibration transmitting plate 31 and the calibration receiving plate 32 increase, the capacitance of the calibration capacitor unit increases, and as... Figure 6 As shown, the capacitance of the calibration capacitor unit is positively correlated with the dielectric constant of the contents (liquid dielectric constant). When the height of the contents 4 inside the enclosure increases, as... Figure 5As shown, due to the structure and size of the enclosure, the number of electric field lines on the calibration transmitting plate 31 and the calibration receiving plate 32 is almost the same as the number of electric field lines when there is a small amount of content inside the enclosure. The number of electric field lines has an upper limit; therefore, even with an increase in the content inside the enclosure, the coupling effect remains essentially unchanged, and the capacitance also remains almost unchanged. That is, an increase in the content inside the enclosure will not affect the calculation of the dielectric constant of the content. According to the formula C=εS / 4πkd; where ε represents the dielectric constant of the medium, determined by the medium between the plates, such as air or water; and k represents the electrostatic constant, also known as the Coulomb constant, k=8.987551×10 9 N·m 2 / C; S represents the area of ​​the two plates; d represents the distance between the two plates; π represents pi. Based on the capacitance detected by the calibration capacitor unit, and the known plate area and plate spacing, the dielectric constant of the contents can be calculated.

[0025] The detection principle of the capacitor detection unit will be explained below: In the height direction, detection capacitor units are installed on each of the sides 12 of the enclosure, such as... Figure 7 As shown, the detection capacitor unit includes a detection emitting plate 21 and a detection receiving plate 22. In the area covered by the contents 4, the detection emitting plate 21 and the detection receiving plate 22 are coupled using the contents 4. In the empty area inside the box (area without contents), the detection emitting plate 21 and the detection receiving plate 22 are coupled using the box material and air. The capacitance of the detection capacitor unit is determined by the sum of the coupling effects at both locations. Taking liquid stored inside the box as an example... Figure 8 The diagram shows the relationship between the detection capacitor unit and the liquid storage height (water level). When the tank is empty, both the detection transmitting plate 21 and the detection receiving plate 22 are coupled using the tank material and air, and the capacitor is fixed. When contents are added to the tank, the capacitance increases with the increase of the water level. For contents with different dielectric constants, the rate of change of capacitance differs for the same change in water level. For example, when the dielectric constant ε1 is greater than the dielectric constant ε2, the rate of change of capacitance corresponding to dielectric constant ε1 is greater than the rate of change of capacitance corresponding to dielectric constant ε2.

[0026] Given the capacitance change rate determined by the calibration capacitor unit and the capacitance detected by the detection capacitor unit, the capacitance values ​​coupled by the contents and coupled by the air and housing material in the detection transmitting plate and detection receiving plate can be determined, thereby determining the storage height of the contents.

[0027] The calibration transmitter and receiver plates need to be positioned near the bottom of the enclosure to ensure they are covered when the enclosure is filled with contents. The positions of the calibration transmitter and receiver plates can be as follows: Figure 2 As shown, both the calibration transmitter plate and the calibration receiver plate are mounted on the bottom surface 11 of the enclosure. Or as... Figure 9 As shown, both the calibration transmitter plate and the calibration receiver plate are located on the side wall near the bottom surface.

[0028] The calibration emitter and receiver plates are typically rectangular. When positioned on the bottom surface, they can be extended along the adjacent sides to increase the capacitance of the calibration capacitor unit and improve its detection sensitivity. When positioned on the sidewalls, their height is minimized to ensure the contents can cover them.

[0029] Compared to related technologies, this embodiment of the application provides a detection capacitor unit on the side wall of the enclosure and a calibration capacitor unit on the bottom of the enclosure. The detection capacitor unit extends from the bottom of the enclosure towards the highest storage position, and is not lower than the highest storage position. When the enclosure is filled with contents, the contents cover the calibration capacitor unit. The calibration capacitor unit is used to calculate the dielectric constant of the contents, and the detection capacitor unit is used to calculate the storage height of the contents within the enclosure based on the dielectric constant. By using the calibration capacitor unit to detect the dielectric constant of the contents, the storage height of the contents is calibrated, improving the accuracy of position detection and ensuring that the detection results are not affected by environmental factors (such as temperature) or the material of the contents.

[0030] The second embodiment of this application relates to a capacitive position detection and calibration structure. Compared with the first embodiment, the structure of the detection capacitor unit is described in detail below: like Figure 10As shown, there are multiple detection capacitor units, and each detection capacitor unit outputs a corresponding detection result. The storage height is determined based on the average of multiple detection results. Each detection capacitor unit includes a detection emitting plate 21 and a detection receiving plate 22; the detection emitting plate 21 and the detection receiving plate 22 are arranged alternately. Since the detection capacitor units are arranged sequentially in a direction parallel to the bottom surface, when the box is placed at an angle, the average value of the contents relative to the bottom surface of the box can be determined based on the average value of the detection results of the detection capacitor units. Furthermore, the highest and lowest water levels of the contents in the box can be determined based on the capacitance of the detection capacitor units at different positions. The appropriate detection result can be selected according to the actual situation, thus making it suitable for different detection scenarios. At the same time, in order to cope with the detection of box tilt, corresponding detection capacitor units can be set on the four side walls of the box. No matter which direction the box is tilted, there are appropriate detection capacitor units to detect the storage height of the contents.

[0031] In addition, for the same detection capacitor unit, such as Figure 11 and Figure 12 As shown, the detection capacitor unit includes a detection emitting plate 21 and a detection receiving plate 22. There are two detection receiving plates 22, each positioned on one side of the detection emitting plate 21. The detection emitting plate is parallelogram-shaped, and the detection receiving plates on both sides of the detection emitting plate have the same shape, being either trapezoidal or triangular. Changing the arrangement of the detection emitting plate 21 and the detection receiving plate 22 enhances the linearity of the detection result from the detection capacitor unit.

[0032] In this embodiment, the distance between the detection emitting electrode and the detection receiving electrodes on both sides can be set to the same distance.

[0033] In this embodiment, by changing the number, shape, and placement of each plate of the detection capacitor unit, the linearity of the detection results is improved, and the accuracy of the detection results is enhanced when the box is tilted.

[0034] The third embodiment of this application relates to a capacitive position detection and calibration structure. Compared with the above embodiments, the structure of the detection capacitor unit is described in detail: like Figure 13 and Figure 14 As shown, the detection capacitor unit includes: a detection emitting plate 21 and a detection receiving plate 22; there are multiple detection receiving plates 22, which are arranged sequentially along a direction perpendicular to the bottom surface; the capacitance value of the detection emitting plate and at least one detection receiving plate determines the storage height.

[0035] The receiving electrodes are all rectangular, trapezoidal, or triangular; adjacent receiving electrodes form a centrally symmetrical shape. For example... Figure 13As shown, the detection receiving plate is rectangular. Assuming the detection receiving plates 22 are labeled Rx1, Rx2, Rx3, Rx4, and Rx5 starting from the bottom, when the contents fill to position Rx3, the capacitance values ​​generated by the detection transmitting plate 21 with Rx1 and Rx2 are at their maximum values, the capacitance values ​​generated by the detection transmitting plate 21 with Rx4 and Rx5 are at their minimum values, and the capacitance value generated by the detection transmitting plate 21 with Rx3 is between the maximum and minimum values. This determines the positional range of the contents' storage height. The specific position of the contents' storage height is calculated based on the capacitance values ​​generated by the detection transmitting plate 21 with Rx3. Compared to setting a single complete detection receiving plate, this embodiment has higher detection accuracy and is less affected by capacitance detection errors. Figure 14 As shown, the detection receiving plates are right-angled triangles, and all the detection receiving plates form a rectangle. Furthermore, two adjacent detection receiving plates form another rectangle; for example, Rx1 and Rx2 form one rectangle, Rx3 and Rx4 form another, and Rx5 and Rx6 form yet another. At any storage height, the capacitance values ​​of two plates are between their maximum and minimum values. Calculating these two capacitance values ​​can improve the linearity of the detection results from the detection capacitor unit.

[0036] The fourth embodiment of this application relates to a capacitive position detection and calibration structure. Compared with the above embodiments, a grounding element is added to the capacitive position detection and calibration structure to shield part of the interference electric field.

[0037] like Figures 15 to 16 As shown, a grounding element 5 is provided between the detection emitting plate 21 and the detection receiving plate 22. The grounding element 5 does not contact either the detection emitting plate 21 or the detection receiving plate 22, which can shield the electric field lines emitted by the detection emitting plate 21 from directly reaching the detection receiving plate 22 from the opposite side, thus avoiding interference electric fields from affecting the detection results of the detection capacitor unit.

[0038] The implementation details in the above embodiments can be implemented in combination with each other. For example, the grounding component in the fourth embodiment can be used in combination with the detection capacitor unit in the first to third embodiments. The combined solution has the technical effects of the two combined embodiments.

[0039] Another feasible embodiment of this application relates to an electronic device, including the capacitive position detection calibration structure as described above.

[0040] Electronic devices can be robotic vacuum cleaners with water filling functions, coffee machines, water tanks, and cooling equipment with coolant circulation functions. During the operation of the electronic device, the capacitive position detection and calibration structure mentioned above is used to detect the liquid storage height of the electronic device as it increases or circulates, and an alarm is triggered when the added liquid reaches the maximum or minimum value that the tank can hold.

[0041] Compared with related technologies, the electronic device provided in this application embodiment is provided with the capacitive position detection and calibration structure provided in the aforementioned embodiment. Therefore, it also has the technical effects provided in the aforementioned embodiment, and will not be described in detail here.

[0042] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing this application, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of this application.

Claims

1. A capacitive position detection and calibration structure, characterized in that, include: The enclosure includes a detection capacitor unit located on the side wall of the enclosure and a calibration capacitor unit located at the bottom of the enclosure. The enclosure includes a bottom surface and side walls; The detection capacitor unit extends from the bottom of the housing to the highest storage position of the housing, and the detection capacitor unit is not lower than the highest storage position; When the contents are stored in the enclosure, the stored contents cover the calibration capacitor unit; The calibration capacitor unit is used to calculate the dielectric constant of the contents, and the detection capacitor unit is used to calculate the storage height of the contents in the box based on the dielectric constant.

2. The capacitive position detection and calibration structure according to claim 1, characterized in that, The calibration capacitor unit includes: a calibration transmitting plate and a calibration receiving plate; Both the calibration transmitting electrode and the calibration receiving electrode are disposed on the bottom surface of the housing; Alternatively, both the calibration emitter plate and the calibration receiver plate may be disposed on the side wall near the bottom surface.

3. The capacitive position detection and calibration structure according to claim 1, characterized in that, The number of detection capacitor units is multiple, and each detection capacitor unit outputs a corresponding detection result. The storage height is determined based on the average value of the multiple detection results.

4. The capacitive position detection and calibration structure according to claim 3, characterized in that, Each detection capacitor unit includes a detection emitting plate and a detection receiving plate; the detection emitting plate and the detection receiving plate are arranged alternately.

5. The capacitive position detection and calibration structure according to claim 4, characterized in that, The distance between the detection emitting electrode and the detection receiving electrodes on both sides is the same.

6. The capacitive position detection and calibration structure according to claim 1, characterized in that, The detection capacitor unit includes: a detection emitting plate and a detection receiving plate; The number of detection receiving plates is two, and the two detection receiving plates are respectively disposed on both sides of the detection transmitting plate.

7. The capacitive position detection and calibration structure according to claim 6, characterized in that, The detection emitting plate is parallelogram in shape, and the detection receiving plates on both sides of the detection emitting plate are identical in shape, and are trapezoidal or triangular.

8. The capacitive position detection and calibration structure according to claim 1, characterized in that, The detection capacitor unit includes: a detection emitting plate and a detection receiving plate; The number of detection receiving plates is multiple, and the multiple detection receiving plates are arranged sequentially along a direction perpendicular to the bottom surface; The storage height is determined by the capacitance values ​​of the detection emitting electrode and at least one of the detection receiving electrodes.

9. The capacitive position detection and calibration structure according to claim 8, characterized in that, The detection receiving plates are all rectangular, trapezoidal, or triangular; two adjacent detection receiving plates form a centrally symmetrical shape.

10. An electronic device, characterized in that, include: The capacitive position detection calibration structure as described in any one of claims 1 to 9.

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