CN114545091A - SIM card detection device and method and customer premises equipment - Google Patents

SIM card detection device and method and customer premises equipment Download PDF

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Publication number
CN114545091A
CN114545091A CN202210178759.3A CN202210178759A CN114545091A CN 114545091 A CN114545091 A CN 114545091A CN 202210178759 A CN202210178759 A CN 202210178759A CN 114545091 A CN114545091 A CN 114545091A
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sim card
capacitance
detection
sensing element
value
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李宏源
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance

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Abstract

The application discloses an SIM card detection device and method and customer premises equipment, and the SIM card detection device comprises: the capacitance sensing element is electrically connected with the input end of the capacitance digital converter and is used for carrying out proximity detection on the SIM card so as to obtain the changed capacitance according to the proximity degree; the capacitance digital converter is used for converting the capacitance into a digital detection result and outputting the digital detection result to the processor; and the processor is used for converting the digital detection result into an equivalent capacitance value and comparing the equivalent capacitance value with a preset capacitance threshold value to determine whether the SIM card is inserted into the SIM card seat. This application utilizes the capacitive sensor principle to realize inserting the detection of SIM cassette to the SIM card, no longer needs the metal shrapnel to the detection of SIM card, is contactless detection, has avoided the problem that the SIM card detected the erroneous judgement, has saved the space in the SIM cassette moreover.

Description

SIM card detection device and method and customer premises equipment
Technical Field
The present application relates to, but not limited to, electronic technologies, and in particular, to an apparatus and a method for detecting a SIM card and a client front-end device.
Background
For an electronic device capable of setting a Subscriber Identity Module (SIM), i.e. a SIM card, in order to detect whether the SIM card is inserted, a pin electrically connected to a metal dome is usually additionally added to the SIM card socket, and the pin is connected to a General Purpose Input/Output (GPIO) interface of a central processing unit for detecting the insertion of the SIM card.
Fig. 1 is a functional diagram illustrating the detection of a SIM card in the related art, and as shown in fig. 1, when the SIM card is not inserted into the card socket, the GPIO interface is connected to a resistor Rp and pulled up to the VLDO so that the GPIO interface is at a high level; when the SIM card is inserted into the card holder, the metal elastic sheet is pressed and then contacts with the card holder, and the wall of the card holder is grounded, so that the metal elastic sheet is at a low level, and the GPIO interface is at a low level. Therefore, the central processing unit can identify whether the SIM card is inserted into the card seat according to the level state of the GPIO interface.
In a mode of realizing SIM card detection in the related art, a metal elastic sheet needs to be added in a card holder to realize mechanical contact, and hard lap joint is realized by the displacement of the metal elastic sheet triggered by inserting the SIM card, so that the change of a detection signal is generated. On one hand, the metal elastic sheet belongs to a volatile device, the tolerance requirement on the production and manufacturing of the metal elastic sheet is strict, the durable requirement on long-term plugging is also high, and the metal elastic sheet is required not to generate large deformation after long-term plugging, otherwise, the SIM card detection fails; on the other hand, the mechanical contact of the metal elastic sheet is limited by the influence of the contact points, and if foreign matters are generated in the period, the metal elastic sheet can not contact the contact points easily, so that the detection and detection of the SIM card are invalid; moreover, the size of metal shrapnel is less relatively to set up in the inside of SIM cassette, manufacturing cost is higher. That is to say, the problem of SIM card detection misjudgment easily occurs in a manner of achieving SIM card detection by mechanical contact through a metal spring.
Disclosure of Invention
The application provides a device and a method for detecting an SIM card and customer premises equipment, which can avoid the problem of misjudgment of detection of the SIM card and save the space in an SIM card seat.
The embodiment of the application provides a SIM card detection device, includes: a capacitive sensing element, a capacitive digitizer and a processor; wherein the content of the first and second substances,
the capacitance sensing element is electrically connected with the input end of the capacitance digital converter and is used for carrying out proximity detection on the SIM card so as to obtain changed capacitance according to the proximity degree;
the capacitance digital converter is used for converting the capacitance into a digital detection result and outputting the digital detection result to the processor;
and the processor is used for converting the digital detection result into an equivalent capacitance value and comparing the equivalent capacitance value with a preset capacitance threshold value to determine whether the SIM card is inserted into the SIM card seat.
An embodiment of the present application further provides a CPE, including any one of the SIM card detection apparatuses described above.
The embodiment of the application further provides a method for detecting the SIM card, which is applied to the electronic equipment comprising the SIM detection device; the method comprises the following steps:
the electronic equipment carries out proximity detection on the SIM card and obtains the changed capacitance according to the proximity degree;
and determining whether the SIM card is inserted into the SIM card seat according to the obtained capacitance and a preset capacitance threshold.
According to the SIM card detection device and method provided by the embodiment of the application, the SIM card is detected by utilizing the capacitive sensor principle, a metal elastic sheet is not required for the detection of the SIM card any longer, the detection is in a non-contact manner, the problem of misjudgment of the detection of the SIM card is avoided, and the space in the SIM card seat is saved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.
Fig. 1 is a functional diagram illustrating SIM card detection in the related art;
fig. 2 is a schematic diagram of a first embodiment of a structure of a SIM card detection apparatus according to an embodiment of the present application;
fig. 3 is a schematic diagram of a second embodiment of the structure of the SIM card detection apparatus in the embodiment of the present application;
fig. 4 is a diagram illustrating an example of a 3D effect of the SIM card holder in the embodiment of the present application;
FIG. 5 is a diagram illustrating an example of a location of a pad of a PCB in a SIM card socket according to an embodiment of the present invention;
fig. 6 is a schematic flowchart of a SIM card detection method in the embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It is to be understood that the terms "first", "second", and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of technical features being indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
Fig. 2 is a schematic diagram of a first embodiment of a structure of an SIM card detection apparatus in an embodiment of the present application, and as shown in fig. 2, the SIM card detection apparatus at least includes: a capacitive sensing element, a capacitive digitizer and a processor; the capacitance sensing element is electrically connected with the input end of the capacitance digital converter and is used for carrying out proximity detection on the SIM card so as to obtain changed capacitance according to the proximity degree; the capacitance digital converter is used for converting the detected capacitance of the capacitance sensor formed by the capacitance sensing element and the SIM card into a digital detection result and outputting the digital detection result to the processor; the processor is used for converting the digital detection result into an equivalent capacitance value and comparing the equivalent capacitance value with a preset capacitance threshold value to determine whether the SIM card is inserted into the SIM card seat.
The SIM detection device provided by the embodiment of the application utilizes the capacitance sensor principle to realize the detection of the SIM card, does not need a metal elastic sheet for the detection of the SIM card any longer, is non-contact detection, avoids the problem of misjudgment of the detection of the SIM card, and saves the space in the SIM card seat.
In one illustrative example, the capacitive sensing element may be a metal sheet. In the first embodiment of the present application, the capacitance sensing element corresponds to a fixed plate, the SIM card corresponds to a movable plate, and when the SIM card moves along the direction shown by the arrow in fig. 2, the area S (shown by the shaded portion in fig. 2) covered by the SIM card and the capacitance sensing element changes, so that the capacitance of the two-plate capacitor changes, and the relationship between the two can be shown as formula (1):
Figure BDA0003521432990000041
in the formula (1), C represents the capacitance of the parallel plate capacitor, ε0Denotes the vacuum dielectric constant,. epsilonrThe relative dielectric constant of the plate dielectric material is shown, A represents the mutual covering area of the plates, and d represents the distance between two parallel plates. It should be noted that, the parallelism of the two electrode plates in the present application is not an absolute parallelism, and some errors may exist, as long as the state of the SIM card, such as inserting the SIM card holder or extracting the SIM card holder, can be determined according to the variation value of the capacitance.
In one embodiment, assuming that the direction to the right in fig. 2 is the insertion direction of the SIM card, the mutual plate coverage area S increases as the SIM card is inserted, as shown in formula (1), which means that the capacitance of the two-plate capacitor increases. In one embodiment, assuming that the direction to the left in fig. 2 is the insertion direction of the SIM card, the mutual plate coverage area S decreases as the SIM card is inserted, as shown in formula (1), which means that the capacitance of the two-plate capacitor decreases. In the first embodiment, the capacitance sensing element may perform proximity detection on the SIM card according to a change in the area covered by the SIM card and the capacitance sensing element to obtain a proximity degree, so as to output a changed capacitance according to the proximity degree.
In another embodiment, as shown in fig. 3, the SIM card detection apparatus provided in this embodiment of the present application may further include: another metal sheet, which in one embodiment may be a PCB floor provided to the SIM card holder. In one embodiment, the PCB floor and the top shell of the SIM card holder may be soldered. In the embodiment shown in fig. 3, the capacitive sensing element corresponds to one plate and another metal plate connected to ground, such as a PCB ground, corresponds to the other plate, i.e., the capacitive sensing element and the PCB ground act as two plates to form a capacitive sensor. When the SIM card moves in the direction indicated by the arrow in fig. 3, the dielectric coefficient between the two plates changes, so that the capacitance of the two-plate capacitor changes, and the relationship between the two can be shown in equation (2).
Figure BDA0003521432990000051
In the formula (2), C represents the total capacitance of the parallel plate capacitor, and the total capacitance C is the capacitance C1And a capacitor C2The parallel result of (c); as shown in FIG. 3, |0、b0Respectively the length and width of the plates, l the length of another dielectric substance, i.e. SIM card, between the plates, d0Denotes the distance between two parallel plates, ε0Denotes the vacuum dielectric constant,. epsilonr1Denotes the relative dielectric constant, ε, of the dielectric material of the bipolar plater2Which represents the relative permittivity of another dielectric, the SIM card. As can be seen from fig. 3, the capacitance when l is 0 is the initial capacitance.
In one embodiment, when the SIM card is inserted or removed between the two plates as shown in fig. 3, the dielectric coefficient between the two plates changes with the insertion or removal of the SIM card, which means that the capacitance of the two-plate capacitor changes, so that the capacitance sensing element can perform proximity detection on the SIM card according to the change of the dielectric coefficient of the SIM card inserted between the two plates to obtain the changed capacitance. As can be seen from the formula (2), the dielectric constant is εr2The SIM cards are inserted into the parallel capacitor plate electrode devices at different depths, the plate coverage areas of two media can be changed, and therefore the total capacitance of the parallel plate capacitor is changed.
In an exemplary embodiment, the capacitance-to-digital converter may be implemented by a circuit composed of independent components, or may be implemented by a capacitance-to-digital conversion chip, and the specific implementation form is not used to limit the protection scope of the present application. In one embodiment, for example, the capacitance-to-digital converter is a capacitance-to-digital conversion chip, which converts the detected capacitance into a digital detection result proportional to the frequency, and then passes through a data line such as I2The C bus outputs to the processor. In one embodiment, a capacitive-to-digital converter IC such as the FDC2x1x series may be used as the capacitive-to-digital conversion chip.
In an exemplary embodiment, a first capacitance threshold is preset in the processor, and taking a direction to the right in fig. 2 as an example of an insertion direction of the SIM card, when an equivalent capacitance value obtained by conversion according to the digital detection result reaches the first capacitance threshold, it is determined that the SIM card is inserted into the SIM card socket; and when the equivalent capacitance value obtained by conversion according to the digital detection result is smaller than the first capacitance threshold value, determining that the SIM card is not inserted into the SIM card seat or the SIM card is inserted into the SIM card seat but is not inserted. Here, the first capacitance threshold value is a capacitance value determined according to a mutual coverage area between the SIM card and the capacitance sensing element, which can be measured in advance. In one embodiment, the first capacitance threshold may be a capacitance measured when the SIM card is close to the capacitance sensing element and the mutual coverage area of the capacitance sensing element and the SIM card is the largest, that is, a capacitance measured when the capacitance sensing element as the bipolar plate and the SIM card have the largest mutual coverage area a. In one embodiment, the first capacitance threshold may be a capacitance measured when the SIM card is close to the capacitance sensing element and the mutual coverage area of the two falls within a first area range, and a capacitance measured when the capacitance sensing element as the bipolar plate and the SIM card cover the mutual area a within the first area range. Wherein, the ratio between the first area and the maximum mutual coverage area can be greater than or equal to 80%, such as 85%, 90%, 95% and so on.
In an exemplary embodiment, a second capacitance threshold is preset in the processor, and taking a direction to the left in fig. 2 as an example of an insertion direction of the SIM card, when an equivalent capacitance value obtained by conversion according to the digital detection result reaches the second capacitance threshold, it is determined that the SIM card is inserted into the SIM card socket; and when the equivalent capacitance value obtained by conversion according to the digital detection result is larger than the second capacitance threshold value, determining that the SIM card is not inserted into the SIM card seat or the SIM card is inserted into the SIM card seat but is not inserted. Here, the second capacitance threshold value is a capacitance value determined according to a mutual coverage area between the SIM card and the capacitance sensing element, which can be measured in advance. In one embodiment, the second capacitance threshold may be a capacitance measured when the SIM card is close to the capacitance sensing element and the mutual coverage area of the two is smallest, that is, the capacitance of the capacitance sensor formed by the capacitance sensing element and the SIM card is measured when the mutual coverage area S of the capacitance sensing element as the bipolar plate and the SIM card is smallest. In one embodiment, the second capacitance threshold may be a capacitance measured when the SIM card is close to the capacitance sensing element and the mutual coverage area of the two falls within a second area range, and a capacitance measured when the capacitance sensing element as the bipolar plate and the mutual coverage area a of the SIM card fall within the second area range. The ratio of the second area to the maximum mutual coverage area may be less than or equal to 20%, for example, 15%, 10%, 5%, etc.
In an exemplary example, a first capacitance threshold and a second capacitance threshold are preset in the processor, taking a direction to the right in fig. 2 as an insertion direction of the SIM card as an example, when the equivalent capacitance value converted according to the digital detection result is in a trend of becoming larger, indicating that the SIM card is being inserted, and when the equivalent capacitance value becomes larger to the first capacitance threshold, it is determined that the SIM card is inserted into the SIM card holder; and when the equivalent capacitance value obtained by conversion according to the digital detection result is in a trend of being reduced, the SIM card is pulled out, and when the equivalent capacitance value is reduced to a second capacitance threshold value, the SIM card is determined to be pulled out.
In an exemplary example, a first capacitance threshold and a second capacitance threshold are preset in the processor, taking a direction to the left in fig. 2 as an insertion direction of the SIM card as an example, when an equivalent capacitance value obtained by conversion according to the digital detection result is in a trend of becoming smaller, indicating that the SIM card is being inserted into the SIM card holder, and when the equivalent capacitance value becomes smaller to the second capacitance threshold, it is determined that the SIM card is inserted into the SIM card holder well; and when the equivalent capacitance value obtained by conversion according to the digital detection result is in a trend of increasing, the SIM card is pulled out, and when the equivalent capacitance value is increased to a first capacitance threshold value, the SIM card is determined to be pulled out.
In an exemplary embodiment, a third capacitance threshold is preset in the processor, and taking fig. 3 as an example, when the equivalent capacitance value obtained by conversion according to the digital detection result reaches the third capacitance threshold, it is determined that the SIM card is inserted into the SIM card holder and inserted; and when the equivalent capacitance value obtained by conversion according to the digital detection result does not reach the third capacitance threshold value, determining that the SIM card is not inserted into the SIM card seat or the SIM card is inserted into the SIM card seat but is not inserted well. Here, the third capacitance threshold value is a capacitance value determined according to a depth of the SIM card inserted between the two plates formed by the detection element and the PCB floor, which can be measured in advance. In one embodiment, the third capacitance threshold may be a capacitance measured when the SIM card is fully inserted between the two plates formed by the sensing element and the PCB ground as shown in fig. 3. In one embodiment, the third capacitance threshold may be a range of capacitance measured when the SIM card is inserted between the two plates of the sensing element and the PCB ground as shown in fig. 3 and reaches a range of depths. For example, when the insertion depth of the SIM card is greater than or equal to 80% of the maximum insertion depth, for example, a value of 85%, 90%, 95%, etc., the SIM card is considered to be inserted into the SIM card holder.
In an exemplary embodiment, the capacitive sensing element may be disposed on the SIM card holder, and the position is not particularly limited as long as it is ensured that the capacitive sensing element and the SIM card can constitute a capacitive sensor and form a varying capacitance during insertion and extraction of the SIM card. In one embodiment, as shown in fig. 4, the SIM card holder may include a top case 200, a plastic support 201, and a capacitive sensing element 203; wherein, the top shell 200 is welded with the PCB and is clamped with the plastic bracket 201; the capacitive sensing element 203 is disposed on the top case 200, and as shown by the light areas around the capacitive sensing element 203 in fig. 4, the capacitive sensing element 203 is insulated from the top case 200. The capacitance sensor element 203 is provided with a lead-out connecting wire which can be electrically connected with a certain bonding pad on the PCB, and after the capacitance sensor element 203 detects the proximity of the SIM card, the detected capacitance of the capacitance sensor formed by the capacitance sensor element 203 and the SIM card is transmitted to a capacitance digital converter arranged on the PCB through the connecting wire.
In one embodiment, the capacitive sensing element 203 may have an external shape as shown in fig. 4, which is illustrated as a rectangle in fig. 4, or may have other shapes such as an ellipse, a diamond, etc. This is merely an example for visually illustrating the capacitive sensing element 203 and is not intended to limit the scope of the present application.
It should be noted that other structural implementations of the top case 200 and the plastic bracket 201 are the same as those in the prior art. For example, the plastic holder 201 includes a spring plate directly injection-molded in the plastic holder 201 and contacting with 6 existing golden finger signals of the SIM card, and the 6 existing signals include: a working power supply VCC, a reset RST signal, a clock CLK signal, ground GND, a programming power supply Vpp, a DATA input/output (DATA) signal. The detailed description is omitted here.
In an exemplary embodiment, as shown in fig. 5, the capacitive sensing element 203 may be electrically connected to the PCB board through the existing pad 16 of fig. 5, and the capacitive digitizer disposed on the PCB board may be electrically connected to the capacitive sensing element 203 through the pad 16. Here, it is merely an example, and the capacitance-to-digital converter on the PCB board and the capacitance sensing element 203 may be electrically connected by a newly provided pad. Other pads shown in fig. 5 are existing pads such as: the SIM card comprises a pad 1 communicated with an operating power supply VCC of the SIM card, a pad 2 connected with a reset RST signal of the SIM card, a pad 3 communicated with a clock CLK signal of the SIM card, a pad 4 communicated with a ground GND of the SIM card (also called a second pad in the text), a pad 5 communicated with a programming power supply Vpp of the SIM card, a pad 6 communicated with a DATA input/output (DATA I/O) of the SIM card, a pad 7 communicated with a first metal dome SW1 for realizing SIM card detection in the SIM card related art (also called a third pad in the text), pads 8-15, 17 communicated with the ground of a SIM card holder shell, and a pad 18 communicated with other function switches SW2 of the SIM card. In one embodiment, as shown in fig. 4, the PCB board is connected with the card shell of the SIM card socket by welding through the ground GND bonding pad, and the top shell 200 is connected with the PCB board by welding through the bonding pads 8-15, 17. The hatched portion in fig. 4 is a keep-out region.
In an exemplary embodiment, the capacitance sensing element may be disposed on a PCB board connected to the top case of the SIM card socket, for example, under the area where the SIM card is located, and when the PCB board is molded, a metal area is directly laid under the area to form a metal sheet as the capacitance sensing element, in this way, the structure of the SIM card socket does not need to be changed. Also, the position of the capacitive sensing element on the PCB is not particularly required, as long as it is ensured that the capacitive sensing element and the SIM card can form a capacitive sensor and form a varying capacitance during insertion and extraction of the SIM card.
The SIM card detection device provided by the embodiment of the application is suitable for electronic equipment needing to use the SIM card.
Customer Premise Equipment (CPE) is a mobile signal access device for receiving mobile signals and forwarding out wireless Wi-Fi signals. A SIM card holder is used on the CPE. The SIM card detection device provided by the embodiment of the application can be used in CPE.
The embodiment of the present application further provides a CPE, which includes any one of the SIM card socket detection devices described in the embodiments of the present application.
Based on the same inventive concept, an embodiment of the present application further provides a SIM card detection method, which is applied to an electronic device including the SIM detection apparatus provided in the embodiment of the present application, and as shown in fig. 6, the method includes:
step 600: the electronic equipment carries out proximity detection on the SIM card and obtains the changed capacitance according to the proximity degree.
In an exemplary embodiment, as the SIM card moves, the mutual coverage area a of the capacitive sensing element of the SIM card and the SIM detection apparatus changes, and the capacitance of the capacitive sensor formed by the capacitive sensing element and the SIM card is proportional to the mutual coverage area a and satisfies formula (1).
In an exemplary embodiment, when the SIM card is inserted or pulled between the two plates shown in fig. 3, the dielectric coefficient between the plates changes with the insertion or pulling of the SIM card, which means that the capacitance of the two-plate capacitor changes and equation (2) is satisfied.
In one embodiment, step 600 may comprise:
and carrying out proximity detection on the SIM card according to the change of the dielectric coefficient caused by the SIM card inserted between two polar plates in the SIM detection device so as to obtain the changed capacitance.
In one embodiment, step 600 may comprise:
and detecting the proximity of the SIM card according to the change of the mutual coverage area of the SIM card and the capacitance sensing element in the SIM detection device to obtain the changed capacitance.
Step 601: and determining whether the SIM card is inserted into the SIM card seat according to the obtained capacitance and a preset capacitance threshold.
In one illustrative example, the step may include:
converting the obtained capacitance of a capacitance sensor formed by the capacitance sensing element and the SIM card into a digital detection result through a capacitance digital converter of the SIM detection device and outputting the digital detection result to a processor of the SIM detection device;
and the processor of the SIM detection device converts the digital detection result into an equivalent capacitance value and compares the equivalent capacitance value with a preset capacitance threshold value to determine whether the SIM card is inserted into the SIM card seat.
In an exemplary instance, for a case where the preset capacitance threshold includes a first capacitance threshold, determining whether the SIM card is inserted into the SIM card holder may include:
when the equivalent capacitance value reaches a first capacitance threshold value, determining that the SIM card is inserted into the SIM card seat; and when the equivalent capacitance value is smaller than the first capacitance threshold value, determining that the SIM card is not inserted into the SIM card seat or the SIM card is inserted into the SIM card seat but is not inserted. The first capacitance threshold is capacitance determined according to the proximity of the SIM card to the capacitance sensing element and the mutual coverage area of the two, and may be a threshold or a threshold range.
In an exemplary example, for a case where the preset capacitance threshold includes the second capacitance threshold, determining whether the SIM card is inserted into the SIM card holder may include:
when the equivalent capacitance value reaches a second capacitance threshold value, determining that the SIM card is inserted into the SIM card seat; and when the equivalent capacitance value is larger than the second capacitance threshold value, determining that the SIM card is not inserted into the SIM card seat or the SIM card is inserted into the SIM card seat but is not inserted. The second capacitance threshold is capacitance determined according to the proximity of the SIM card to the capacitance sensing element and the mutual coverage area of the two, and may be a threshold or a threshold range.
In an exemplary instance, for a case where the preset capacitance threshold includes a first capacitance threshold and a second capacitance threshold, determining whether the SIM card is inserted into the SIM card holder may include:
when the equivalent capacitance value is in a trend of increasing, the SIM card is inserted, and when the capacitance value is increased to reach a first capacitance threshold value, the SIM card is determined to be inserted into the SIM card seat; when the equivalent capacitance value is in a trend of becoming smaller, the SIM card is indicated to be pulled out, and when the capacitance value becomes smaller than a second capacitance threshold value, the SIM card is determined to be pulled out; alternatively, the first and second liquid crystal display panels may be,
when the equivalent capacitance value is in a trend of becoming smaller, the SIM card is inserted, and when the capacitance value becomes smaller and reaches a second capacitance threshold value, the SIM card is determined to be inserted into the SIM card seat; when the equivalent capacitance value is in a trend of becoming larger, the SIM card is indicated to be pulled out, and when the capacitance value becomes larger than the first capacitance threshold value, the SIM card is determined to be pulled out.
In an exemplary instance, for a case where the preset capacitance threshold includes a third capacitance threshold, determining whether the SIM card is inserted into the SIM card holder may include:
when the equivalent capacitance value reaches a third capacitance threshold value, determining that the SIM card is inserted into the SIM card seat; and when the equivalent capacitance value does not reach the third capacitance threshold value, determining that the SIM card is not inserted into the SIM card seat or the SIM card is inserted into the SIM card seat but is not inserted well. The third capacitance threshold is a capacitance determined according to the depth of the SIM card inserted between the two plates formed by the detection element and the PCB floor, and may be a threshold or a threshold range.
According to the SIM detection method provided by the embodiment of the application, the capacitance sensor is utilized to detect the SIM card, the metal elastic sheet is not needed for detecting the SIM card, the detection is in a non-contact mode, the problem of misjudgment of the detection of the SIM card is avoided, and the space in the SIM card seat is saved.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the purpose of facilitating understanding of the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.

Claims (14)

1. An apparatus for detecting a SIM card, comprising: a capacitive sensing element, a capacitive digitizer and a processor; wherein, the first and the second end of the pipe are connected with each other,
the capacitance sensing element is electrically connected with the input end of the capacitance digital converter and is used for carrying out proximity detection on the SIM card so as to obtain changed capacitance according to the proximity degree;
the capacitance digital converter is used for converting the capacitance into a digital detection result and outputting the digital detection result to the processor;
and the processor is used for converting the digital detection result into an equivalent capacitance value and comparing the equivalent capacitance value with a preset capacitance threshold value to determine whether the SIM card is inserted into the SIM card seat.
2. The SIM card detection apparatus of claim 1, wherein the capacitive sensing element is disposed on a top case of the SIM card holder.
3. The SIM card detection apparatus of claim 2, further comprising a PCB floor disposed in the SIM card holder; the capacitance sensing element and the PCB floor are used as two polar plates to form a capacitance sensor;
the capacitance sensing element detects the proximity of the SIM card according to the change of the dielectric coefficient caused by the insertion of the SIM card between the two polar plates so as to obtain the changed capacitance.
4. The SIM card detection apparatus of claim 1, wherein the capacitive sensing element is disposed on a PCB board coupled to a top case of the SIM card holder.
5. The SIM card detection apparatus of claim 2, 3 or 4, wherein the capacitive sensing element is a metal sheet.
6. The SIM card detection apparatus according to claim 2 or 4, wherein the capacitance sensing element performs proximity detection on the SIM card according to a change in a mutual coverage area of the SIM card and the capacitance sensing element to obtain the changed capacitance.
7. The SIM card detection apparatus according to claim 6, wherein a first capacitance threshold value is preset in the processor; when the equivalent capacitance value reaches the first capacitance threshold value, determining that the SIM card is inserted into the SIM card seat; when the equivalent capacitance value is smaller than the first capacitance threshold value, determining that the SIM card is not inserted into the SIM card seat or the SIM card is inserted into the SIM card seat but is not inserted;
the first capacitance threshold is a capacitance determined according to a mutual coverage area between the SIM card and the capacitive sensing element.
8. The SIM card detection apparatus according to claim 6, wherein a second capacitance threshold value is preset in the processor; when the equivalent capacitance value reaches the second capacitance threshold value, determining that the SIM card is inserted into the SIM card seat; when the equivalent capacitance value is larger than the first capacitance threshold value, determining that the SIM card is not inserted into the SIM card seat or the SIM card is inserted into the SIM card seat but is not inserted;
the second capacitance threshold is a capacitance determined according to a mutual coverage area between the SIM card and the capacitive sensing element.
9. The SIM card detection apparatus according to claim 6, wherein a first capacitance threshold and a second capacitance threshold are preset in the processor;
when the equivalent capacitance value is in a trend of becoming larger, the SIM card is inserted into the SIM card seat, and when the equivalent capacitance value becomes larger to the first capacitance threshold value, the SIM card is determined to be inserted into the SIM card seat; when the equivalent capacitance value is in a trend of becoming smaller, the SIM card is indicated to be pulled out, and when the equivalent capacitance value becomes smaller to the second capacitance threshold value, the SIM card is determined to be pulled out; alternatively, the first and second electrodes may be,
when the equivalent capacitance value is in a trend of becoming smaller, the SIM card is inserted into the SIM card seat, and when the equivalent capacitance value becomes smaller to the second capacitance threshold value, the SIM card is determined to be inserted into the SIM card seat; when the equivalent capacitance value is in a trend of becoming larger, the SIM card is indicated to be pulled out, and when the equivalent capacitance value becomes larger to the first capacitance threshold value, the SIM card is determined to be pulled out;
the first capacitance threshold or the second capacitance threshold is a capacitance determined according to a mutual coverage area between the SIM card and the capacitive sensing element.
10. The SIM card detection apparatus according to claim 3, wherein a third capacitance threshold value is preset in the processor;
when the equivalent capacitance value reaches the third capacitance threshold value, determining that the SIM card is inserted into the SIM card seat; when the equivalent capacitance value does not reach the third capacitance threshold value, determining that the SIM card is not inserted into the SIM card seat or the SIM card is inserted into the SIM card seat but is not inserted;
wherein the third capacitance threshold is a capacitance determined according to a depth of insertion of the SIM card between the two plates.
11. A client premises apparatus, comprising: the SIM card detection device of any one of claims 1 to 10.
12. A SIM card detection method, which is applied to an electronic device including the SIM detection apparatus according to any one of claims 1 to 11; the method comprises the following steps:
the electronic equipment carries out proximity detection on the SIM card and obtains the changed capacitance according to the proximity degree;
and determining whether the SIM card is inserted into the SIM card seat according to the obtained capacitance and a preset capacitance threshold.
13. The SIM card detection method of claim 12, wherein the obtaining of the varied capacitance according to the proximity comprises:
and carrying out proximity detection on the SIM card according to the change of the dielectric coefficient caused by the SIM card inserted between two polar plates in the SIM detection device so as to obtain the changed capacitance.
14. The SIM card detection method of claim 12, wherein the obtaining of the varied capacitance according to the proximity comprises:
and detecting the proximity of the SIM card according to the change of the mutual coverage area of the SIM card and a capacitance sensing element in the SIM detection device to obtain the changed capacitance.
CN202210178759.3A 2022-02-25 2022-02-25 SIM card detection device and method and customer premises equipment Pending CN114545091A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101266167A (en) * 2008-04-08 2008-09-17 太原理工大学 Capacitance type digital material-level sensor and its measurement method
CN102034064A (en) * 2009-09-28 2011-04-27 东信和平智能卡股份有限公司 Method and device for controlling communication distance of radio frequency SIM card by capacitive induction
CN105120081A (en) * 2015-07-24 2015-12-02 Tcl移动通信科技（宁波）有限公司 SIM card detection device and method thereof for detecting plugging and unplugging of SIM card
CN107402234A (en) * 2017-07-28 2017-11-28 青岛海信移动通信技术股份有限公司 The method and terminal of defects inspecting are carried out to the deck that SIM card is provided with terminal
CN110912574A (en) * 2019-12-27 2020-03-24 Tcl移动通信科技（宁波）有限公司 SIM card detection method, device, storage medium and terminal
CN112468979A (en) * 2019-09-06 2021-03-09 华为技术有限公司 SIM card drop recovery method of electronic equipment and electronic equipment
CN113079234A (en) * 2021-03-24 2021-07-06 维沃移动通信有限公司 SIM card loading assembly, method and device for preventing reverse placement of SIM card and electronic equipment

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101266167A (en) * 2008-04-08 2008-09-17 太原理工大学 Capacitance type digital material-level sensor and its measurement method
CN102034064A (en) * 2009-09-28 2011-04-27 东信和平智能卡股份有限公司 Method and device for controlling communication distance of radio frequency SIM card by capacitive induction
CN105120081A (en) * 2015-07-24 2015-12-02 Tcl移动通信科技（宁波）有限公司 SIM card detection device and method thereof for detecting plugging and unplugging of SIM card
CN107402234A (en) * 2017-07-28 2017-11-28 青岛海信移动通信技术股份有限公司 The method and terminal of defects inspecting are carried out to the deck that SIM card is provided with terminal
CN112468979A (en) * 2019-09-06 2021-03-09 华为技术有限公司 SIM card drop recovery method of electronic equipment and electronic equipment
CN110912574A (en) * 2019-12-27 2020-03-24 Tcl移动通信科技（宁波）有限公司 SIM card detection method, device, storage medium and terminal
CN113079234A (en) * 2021-03-24 2021-07-06 维沃移动通信有限公司 SIM card loading assembly, method and device for preventing reverse placement of SIM card and electronic equipment

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